Merge branch 'master' into lowercase

.gitignore

@@ -1,3 +1,5 @@
 *.ppm
 build/
 *.swp
+nobuild
+nobuild.old

README.md

@@ -1,10 +1,14 @@
 # Olive.c
 
+<p align="center">
+<a href="https://tsoding.github.io/olive.c/"><img src="./assets/olivec-200.png"></a>
+</p>
+
 **IMPORTANT! THIS LIBRARY IS A WORK IN PROGRESS! ANYTHING CAN CHANGE AT ANY MOMENT WITHOUT ANY NOTICE! USE THIS LIBRARY AT YOUR OWN RISK!**
 
 Simple graphics library that does not have any dependencies and renders everything into the given memory pixel by pixel.
 
-Visit [https://tsoding.org/olive.c/](https://tsoding.org/olive.c/) to see some demos.
+Visit [https://tsoding.github.io/olive.c/](https://tsoding.github.io/olive.c/) to see some demos.
 
 The library is not concerned with displaying the image. It only fills up the memory with pixels. It's up to you what to do with those pixels.
 
@@ -16,7 +20,8 @@ Olive.c is a classical [stb-style](https://github.com/nothings/stb) single heade
 
 ## Quick Example (Flag of Japan)
 
-<!-- TODO: get rid of the dependency on stb_image_write.h in here and replace it with PPM format -->
+> [!WARNING]
+> Always initialize your Canvas with a color that has Non-Zero Alpha Channel! A lot of functions use `olivec_blend_color()` function to blend with the Background which preserves the original Alpha of the Background. So you may easily end up with a result that is perceptually transparent if the Alpha is Zero.
 
 *This example also uses [stb_image_write.h](https://raw.githubusercontent.com/nothings/stb/master/stb_image_write.h) to create the PNG image*
 
@@ -35,7 +40,7 @@ uint32_t pixels[WIDTH*HEIGHT];
 
 int main(void)
 {
-    Olivec_Canvas oc = olivec_canvas(pixels, WIDTH, HEIGHT);
+    Olivec_Canvas oc = olivec_canvas(pixels, WIDTH, HEIGHT, WIDTH);
     // Taken from https://upload.wikimedia.org/wikipedia/en/9/9e/Flag_of_Japan.svg
     olivec_fill(oc, 0xFFFFFFFF);
     olivec_circle(oc, WIDTH/2, HEIGHT/2, 180, 0xFF2D00BC);
@@ -51,10 +56,11 @@ int main(void)
 
 ## Building the Tests and Demos
 
-Even though the library does not require any special building, the tests and demos do. Just execute `build.sh` script to build everything.
+Even though the library does not require any special building, the tests and demos do. We use [nobuild](https://github.com/tsoding/nobuild) build system:
 
 ```console
-$ ./build.sh
+$ clang -o nobuild nobuild.c
+$ ./nobuild
 ```
 
 ## Tests
@@ -68,7 +74,7 @@ $ ./build/test run
 If the expected behavior of the library has changed in the way that breaks current test cases, you probably want to update them:
 
 ```console
-$ ./build/test record
+$ ./build/test update
 ```
 
 For more info see the help:
@@ -88,16 +94,16 @@ The source code for demos is located at [demos](./demos/). Each demo is compiled
 To run the SDL version of a demo do
 
 ```console
-$ ./build/<demo>.sdl
+$ ./build/demos/<demo>.sdl
 ```
 
 To run the Terminal version of a demo do
 
 ```console
-$ ./build/<demo>.term
+$ ./build/demos/<demo>.term
 ```
 
-To run the WASM versions of the demos from [https://tsoding.org/olive.c/](https://tsoding.org/olive.c/) locally do
+To run the WASM versions of the demos from [https://tsoding.github.io/olive.c/](https://tsoding.github.io/olive.c/) locally do
 
 ```console
 $ python3 -m http.server 6969

assets/CREDITS.txt

@@ -0,0 +1,5 @@
+- https://opengameart.org/content/handpainted-stone-texture
+  - lavastone-origin.png
+  - lavastone.png
+  - oldstone-origin.png
+  - oldstone.png

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build.sh

@@ -1,31 +0,0 @@
-#!/bin/sh
-
-set -xe
-
-COMMON_CFLAGS="-Wall -Wextra -ggdb -I. -I./build/ -I./thirdparty/"
-
-build_vc_demo() {
-    NAME=$1
-
-    clang $COMMON_CFLAGS -Os -fno-builtin --target=wasm32 --no-standard-libraries -Wl,--no-entry -Wl,--export=render -Wl,--export=__heap_base -Wl,--allow-undefined -o ./build/$NAME.wasm -DPLATFORM=WASM_PLATFORM ./demos/$NAME.c
-    cp ./build/$NAME.wasm ./wasm/
-    clang $COMMON_CFLAGS -o ./build/$NAME.sdl -DPLATFORM=SDL_PLATFORM ./demos/$NAME.c -lm -lSDL2
-    clang $COMMON_CFLAGS -o ./build/$NAME.term -DPLATFORM=TERM_PLATFORM ./demos/$NAME.c -lm
-}
-
-mkdir -p ./build/
-
-# Build asserts
-clang $COMMON_CFLAGS -o ./build/png2c -Ithirdparty png2c.c -lm
-mkdir -p ./build/assets/
-./build/png2c ./assets/tsodinPog.png > ./build/assets/tsodinPog.c
-
-# Build tests
-clang $COMMON_CFLAGS -fsanitize=memory -o ./build/test -Ithirdparty test.c -lm
-
-# Build VC demos
-build_vc_demo triangle &
-build_vc_demo 3d &
-build_vc_demo squish &
-build_vc_demo triangle3d &
-wait # TODO: the whole script must fail if one of the jobs fails

demos/cup3d.c

@@ -0,0 +1,2 @@
+#include "assets/tsodinCupLowPoly.c"
+#include "model3d.c"

demos/3d.c → demos/dots3d.c

@@ -1,7 +1,3 @@
-// This example renders a rotating 3D cube made out of circles.
-// This idea is that you can take this code and compile it to different platforms with different rendering machanisms:
-// native with SDL, WebAssembly with HTML5 canvas, etc.
-#define SCALE_DOWN_FACTOR 10
 #include "vc.c"
 
 float sqrtf(float x);
@@ -21,20 +17,10 @@ float cosf(float x);
 #define Z_START 0.25
 #define ABOBA_PADDING 50
 
-uint32_t circle_colors[] = {
-    0xFF2020FF,
-    0xFF20FF20,
-    0xFFFF2020,
-    0xFF20FFFF,
-    0xFFFF20FF,
-    0xFFFFFF20,
-};
-#define circle_colors_count (sizeof(circle_colors)/sizeof(circle_colors[0]))
-
 static uint32_t pixels[WIDTH*HEIGHT];
 static float angle = 0;
 
-Olivec_Canvas render(float dt)
+Olivec_Canvas vc_render(float dt)
 {
     angle += 0.25*PI*dt;
 
@@ -76,7 +62,7 @@ Olivec_Canvas render(float dt)
     }
 
     size_t size = 8;
-    olivec_text(oc, "aboba", ABOBA_PADDING, HEIGHT - ABOBA_PADDING - default_font.height*size, default_font, size, 0xFFFFFFFF);
+    olivec_text(oc, "aboba", ABOBA_PADDING, HEIGHT - ABOBA_PADDING - olivec_default_font.height*size, olivec_default_font, size, 0xFFFFFFFF);
 
     return oc;
 }

demos/model3d.c

@@ -0,0 +1,119 @@
+#include "vc.c"
+
+#define WIDTH 960
+#define HEIGHT 720
+#define BACKGROUND_COLOR 0xFF181818
+
+#define PI 3.14159265359
+
+float sqrtf(float x);
+float atan2f(float y, float x);
+float sinf(float x);
+float cosf(float x);
+
+static uint32_t pixels[WIDTH*HEIGHT];
+static float zbuffer[WIDTH*HEIGHT] = {0};
+static float angle = 0;
+
+typedef struct {
+    float x, y;
+} Vector2;
+
+static Vector2 make_vector2(float x, float y)
+{
+    Vector2 v2;
+    v2.x = x;
+    v2.y = y;
+    return v2;
+}
+
+typedef struct {
+    float x, y, z;
+} Vector3;
+
+static Vector3 make_vector3(float x, float y, float z)
+{
+    Vector3 v3;
+    v3.x = x;
+    v3.y = y;
+    v3.z = z;
+    return v3;
+}
+
+#define EPSILON 1e-6
+
+static Vector2 project_3d_2d(Vector3 v3)
+{
+    if (v3.z < 0) v3.z = -v3.z;
+    if (v3.z < EPSILON) v3.z += EPSILON;
+    return make_vector2(v3.x/v3.z, v3.y/v3.z);
+}
+
+static Vector2 project_2d_scr(Vector2 v2)
+{
+    return make_vector2((v2.x + 1)/2*WIDTH, (1 - (v2.y + 1)/2)*HEIGHT);
+}
+
+static Vector3 rotate_y(Vector3 p, float delta_angle)
+{
+    float angle = atan2f(p.z, p.x) + delta_angle;
+    float mag = sqrtf(p.x*p.x + p.z*p.z);
+    return make_vector3(cosf(angle)*mag, p.y, sinf(angle)*mag);
+}
+
+Olivec_Canvas vc_render(float dt)
+{
+    angle += 0.25*PI*dt;
+
+    Olivec_Canvas oc = olivec_canvas(pixels, WIDTH, HEIGHT, WIDTH);
+    olivec_fill(oc, BACKGROUND_COLOR);
+    for (size_t i = 0; i < WIDTH*HEIGHT; ++i) zbuffer[i] = 0;
+
+    for (size_t i = 0; i < faces_count; ++i) {
+        int a = faces[i][0];
+        int b = faces[i][1];
+        int c = faces[i][2];
+        Vector3 v1 = rotate_y(make_vector3(vertices[a][0], vertices[a][1], vertices[a][2]), angle);
+        Vector3 v2 = rotate_y(make_vector3(vertices[b][0], vertices[b][1], vertices[b][2]), angle);
+        Vector3 v3 = rotate_y(make_vector3(vertices[c][0], vertices[c][1], vertices[c][2]), angle);
+        v1.z += 1.5; v2.z += 1.5; v3.z += 1.5;
+        Vector2 p1 = project_2d_scr(project_3d_2d(v1));
+        Vector2 p2 = project_2d_scr(project_3d_2d(v2));
+        Vector2 p3 = project_2d_scr(project_3d_2d(v3));
+
+        int x1 = p1.x;
+        int x2 = p2.x;
+        int x3 = p3.x;
+        int y1 = p1.y;
+        int y2 = p2.y;
+        int y3 = p3.y;
+        int lx, hx, ly, hy;
+        if (olivec_normalize_triangle(oc.width, oc.height, x1, y1, x2, y2, x3, y3, &lx, &hx, &ly, &hy)) {
+            for (int y = ly; y <= hy; ++y) {
+                for (int x = lx; x <= hx; ++x) {
+                    int u1, u2, det;
+                    if (olivec_barycentric(x1, y1, x2, y2, x3, y3, x, y, &u1, &u2, &det)) {
+                        int u3 = det - u1 - u2;
+                        float z = 1/v1.z*u1/det + 1/v2.z*u2/det + 1/v3.z*u3/det;
+                        float near = 0.1f;
+                        float far = 5.0f;
+                        if (1.0f/far < z && z < 1.0f/near && z > zbuffer[y*WIDTH + x]) {
+                            zbuffer[y*WIDTH + x] = z;
+                            OLIVEC_PIXEL(oc, x, y) = mix_colors3(0xFF1818FF, 0xFF18FF18, 0xFFFF1818, u1, u2, det);
+
+                            z = 1.0f/z;
+                            if (z >= 1.0) {
+                                z -= 1.0;
+                                uint32_t v = z*255;
+                                if (v > 255) v = 255;
+                                olivec_blend_color(&OLIVEC_PIXEL(oc, x, y), (v<<(3*8)));
+                            }
+                        }
+                    }
+                }
+            }
+        }
+    }
+
+    return oc;
+}

demos/squish.c

@@ -1,4 +1,3 @@
-#define SCALE_DOWN_FACTOR 10
 #include "vc.c"
 #include "./assets/tsodinPog.c"
 
@@ -7,12 +6,12 @@
 
 float sinf(float);
 
-uint32_t dst[WIDTH*HEIGHT];
-float global_time = 0;
+static uint32_t dst[WIDTH*HEIGHT];
+static float global_time = 0;
 
 #define SRC_SCALE 3
 
-Olivec_Canvas render(float dt)
+Olivec_Canvas vc_render(float dt)
 {
     global_time += dt;
 
@@ -23,13 +22,13 @@ Olivec_Canvas render(float dt)
     olivec_fill(dst_canvas, 0xFF181818);
 
     int factor = 100;
-    int w = png_width*SRC_SCALE - t*factor;
-    int h = png_height*SRC_SCALE + t*factor;
+    int w = tsodinPog_width*SRC_SCALE - t*factor;
+    int h = tsodinPog_height*SRC_SCALE + t*factor;
 
-    olivec_copy(
-        olivec_canvas(png, png_width, png_height, png_width),
+    olivec_sprite_copy_bilinear(
         dst_canvas,
-        WIDTH/2 - w/2, HEIGHT - h, w, h);
+        WIDTH/2 - w/2, HEIGHT - h, w, h,
+        olivec_canvas(tsodinPog_pixels, tsodinPog_width, tsodinPog_height, tsodinPog_width));
 
     return dst_canvas;
 }

demos/teapot3d.c

@@ -0,0 +1,3 @@
+#include "assets/utahTeapot.c"
+#define VC_TERM_SCALE_DOWN_FACTOR 10
+#include "model3d.c"

demos/triangle.c

@@ -1,7 +1,3 @@
-// This example renders a rotating triangle.
-// This idea is that you can take this code and compile it to different platforms with different rendering machanisms:
-// native with SDL, WebAssembly with HTML5 canvas, etc.
-#define SCALE_DOWN_FACTOR 20
 #include "vc.c"
 
 #define WIDTH 960
@@ -34,7 +30,7 @@ static inline void rotate_point(float *x, float *y)
     *y = sinf(dir)*mag + HEIGHT/2;
 }
 
-Olivec_Canvas render(float dt)
+Olivec_Canvas vc_render(float dt)
 {
     Olivec_Canvas oc = olivec_canvas(pixels, WIDTH, HEIGHT, WIDTH);
 
@@ -50,7 +46,7 @@ Olivec_Canvas render(float dt)
         rotate_point(&x1, &y1);
         rotate_point(&x2, &y2);
         rotate_point(&x3, &y3);
-        olivec_triangle3(oc, x1, y1, x2, y2, x3, y3, 0xFF2020FF, 0xFF20FF20, 0xFFFF2020);
+        olivec_triangle3c(oc, x1, y1, x2, y2, x3, y3, 0xFF2020FF, 0xFF20FF20, 0xFFFF2020);
     }
 
     // Circle
@@ -74,4 +70,3 @@ Olivec_Canvas render(float dt)
 
     return oc;
 }
-

demos/triangle3d.c

@@ -1,9 +1,12 @@
-#define SCALE_DOWN_FACTOR 20
-#include "../demos/vc.c"
+#include "vc.c"
 
-#define WIDTH 800
-#define HEIGHT 600
-uint32_t pixels[WIDTH*HEIGHT];
+#define WIDTH 960
+#define HEIGHT 720
+
+static uint32_t pixels1[WIDTH*HEIGHT];
+static float zbuffer1[WIDTH*HEIGHT];
+static uint32_t pixels2[WIDTH*HEIGHT];
+static float zbuffer2[WIDTH*HEIGHT];
 
 typedef struct {
     float x, y;
@@ -21,7 +24,7 @@ typedef struct {
     float x, y, z;
 } Vector3;
 
-Vector3 make_vector3(float x, float y, float z)
+static Vector3 make_vector3(float x, float y, float z)
 {
     Vector3 v3;
     v3.x = x;
@@ -30,48 +33,82 @@ Vector3 make_vector3(float x, float y, float z)
     return v3;
 }
 
-Vector2 project_3d_2d(Vector3 v3)
+static Vector2 project_3d_2d(Vector3 v3)
 {
     return make_vector2(v3.x / v3.z, v3.y / v3.z);
 }
 
-Vector2 project_2d_scr(Vector2 v2)
+static Vector2 project_2d_scr(Vector2 v2)
 {
     return make_vector2((v2.x + 1)/2*WIDTH, (1 - (v2.y + 1)/2)*HEIGHT);
 }
 
-float global_time = 0;
+static float global_time = 1.0;
 
 #define PI 3.14159265359
 
 float sinf(float);
 float cosf(float);
 
-Olivec_Canvas render(float dt)
+Olivec_Canvas vc_render(float dt)
 {
     global_time += dt;
 
-    Olivec_Canvas oc = olivec_canvas(pixels, WIDTH, HEIGHT, WIDTH);
-    olivec_fill(oc, 0xFF181818);
+    Olivec_Canvas oc1 = olivec_canvas(pixels1, WIDTH, HEIGHT, WIDTH);
+    olivec_fill(oc1, 0xFF181818);
+    Olivec_Canvas zb1 = olivec_canvas((uint32_t*)zbuffer1, WIDTH, HEIGHT, WIDTH);
+    olivec_fill(zb1, 0);
 
     float z = 1.5;
+    float t = 0.75;
     {
-        Vector2 p1 = project_2d_scr(project_3d_2d(make_vector3(cosf(global_time)*0.5, -0.5, z + sinf(global_time)*0.5)));
-        Vector2 p2 = project_2d_scr(project_3d_2d(make_vector3(cosf(global_time + PI)*0.5, -0.5, z + sinf(global_time + PI)*0.5)));
-        Vector2 p3 = project_2d_scr(project_3d_2d(make_vector3(0, 0.5, z)));
-        olivec_triangle3(oc, p1.x, p1.y, p2.x, p2.y, p3.x, p3.y, 0xFF1818FF, 0xFF18FF18, 0xFFFF1818);
+        Vector3 v1 = make_vector3(cosf(global_time)*t, -t, z + sinf(global_time)*t);
+        Vector3 v2 = make_vector3(cosf(global_time + PI)*t, -t, z + sinf(global_time + PI)*t);
+        Vector3 v3 = make_vector3(0, t, z);
+
+        Vector2 p1 = project_2d_scr(project_3d_2d(v1));
+        Vector2 p2 = project_2d_scr(project_3d_2d(v2));
+        Vector2 p3 = project_2d_scr(project_3d_2d(v3));
+
+        olivec_triangle3z(zb1, p1.x, p1.y, p2.x, p2.y, p3.x, p3.y, 1.0f/v1.z, 1.0f/v2.z, 1.0f/v3.z);
+        olivec_triangle3c(oc1, p1.x, p1.y, p2.x, p2.y, p3.x, p3.y, 0xFF1818FF, 0xFF18FF18, 0xFFFF1818);
     }
 
-#if 0
+    Olivec_Canvas oc2 = olivec_canvas(pixels2, WIDTH, HEIGHT, WIDTH);
+    olivec_fill(oc2, 0xFF181818);
+    Olivec_Canvas zb2 = olivec_canvas((uint32_t*)zbuffer2, WIDTH, HEIGHT, WIDTH);
+    olivec_fill(zb2, 0);
+
     {
-        Vector2 p1 = project_2d_scr(project_3d_2d(make_vector3(cosf(global_time + PI/2)*0.5, -0.5, z + sinf(global_time + PI/2)*0.5)));
-        Vector2 p2 = project_2d_scr(project_3d_2d(make_vector3(cosf(global_time + PI + PI/2)*0.5, -0.5, z + sinf(global_time + PI + PI/2)*0.5)));
-        Vector2 p3 = project_2d_scr(project_3d_2d(make_vector3(0, 0.5, z)));
-        olivec_triangle3(oc, p1.x, p1.y, p2.x, p2.y, p3.x, p3.y, 0xFF1818FF, 0xFF18FF18, 0xFFFF1818);
+        Vector3 v1 = make_vector3(cosf(global_time + PI/2)*t, -t, z + sinf(global_time + PI/2)*t);
+        Vector3 v2 = make_vector3(cosf(global_time + PI + PI/2)*t, -t, z + sinf(global_time + PI + PI/2)*t);
+        Vector3 v3 = make_vector3(0, t, z);
+
+        Vector2 p1 = project_2d_scr(project_3d_2d(v1));
+        Vector2 p2 = project_2d_scr(project_3d_2d(v2));
+        Vector2 p3 = project_2d_scr(project_3d_2d(v3));
+
+        olivec_triangle3z(zb2, p1.x, p1.y, p2.x, p2.y, p3.x, p3.y, 1.0f/v1.z, 1.0f/v2.z, 1.0f/v3.z);
+        olivec_triangle3c(oc2, p1.x, p1.y, p2.x, p2.y, p3.x, p3.y, 0xFF1818FF, 0xFF18FF18, 0xFFFF1818);
     }
-#endif
 
+    for (size_t y = 0; y < HEIGHT; ++y) {
+        for (size_t x = 0; x < WIDTH; ++x) {
+            float z1 = *(float*)&OLIVEC_PIXEL(zb1, x, y);
+            float z2 = *(float*)&OLIVEC_PIXEL(zb2, x, y);
+            if (z1 < z2) {
+                OLIVEC_PIXEL(oc1, x, y) = OLIVEC_PIXEL(oc2, x, y);
+                z1 = z2;
+            }
+            z1 = 1.0f/z1;
+            if (z1 >= 1.0) {
+                z1 -= 1.0;
+                uint32_t v = z1*255;
+                if (v > 255) v = 255;
+                olivec_blend_color(&OLIVEC_PIXEL(oc1, x, y), (v<<(3*8)));
+            }
+        }
+    }
 
-    
-    return oc;
+    return oc1;
 }

demos/triangle3dTex.c

@@ -0,0 +1,138 @@
+#define VC_TERM_SCALE_DOWN_FACTOR 10
+#include "vc.c"
+#include "./assets/tsodinPog.c"
+#include "./assets/oldstone.c"
+#include "./assets/lavastone.c"
+
+#define WIDTH 960
+#define HEIGHT 720
+
+static uint32_t pixels1[WIDTH*HEIGHT];
+static float zbuffer1[WIDTH*HEIGHT];
+static uint32_t pixels2[WIDTH*HEIGHT];
+static float zbuffer2[WIDTH*HEIGHT];
+
+typedef struct {
+    float x, y;
+} Vector2;
+
+static Vector2 make_vector2(float x, float y)
+{
+    Vector2 v2;
+    v2.x = x;
+    v2.y = y;
+    return v2;
+}
+
+typedef struct {
+    float x, y, z;
+} Vector3;
+
+static Vector3 make_vector3(float x, float y, float z)
+{
+    Vector3 v3;
+    v3.x = x;
+    v3.y = y;
+    v3.z = z;
+    return v3;
+}
+
+static Vector2 project_3d_2d(Vector3 v3)
+{
+    return make_vector2(v3.x / v3.z, v3.y / v3.z);
+}
+
+static Vector2 project_2d_scr(Vector2 v2)
+{
+    return make_vector2((v2.x + 1)/2*WIDTH, (1 - (v2.y + 1)/2)*HEIGHT);
+}
+
+static float global_time = 1.0;
+
+#define PI 3.14159265359
+
+float sinf(float);
+float cosf(float);
+
+Olivec_Canvas vc_render(float dt)
+{
+    global_time += dt;
+
+    Olivec_Canvas oc1 = olivec_canvas(pixels1, WIDTH, HEIGHT, WIDTH);
+    olivec_fill(oc1, 0xFF181818);
+    Olivec_Canvas zb1 = olivec_canvas((uint32_t*)zbuffer1, WIDTH, HEIGHT, WIDTH);
+    olivec_fill(zb1, 0);
+
+    Olivec_Canvas oldstone = olivec_canvas(oldstone_pixels, oldstone_width, oldstone_height, oldstone_width);
+    Olivec_Canvas lavastone = olivec_canvas(lavastone_pixels, lavastone_width, lavastone_height, lavastone_width);
+
+    float z = 1.5;
+    float t = 0.75;
+    {
+        Vector3 v1 = make_vector3(cosf(global_time)*t, -t, z + sinf(global_time)*t);
+        Vector3 v2 = make_vector3(cosf(global_time + PI)*t, -t, z + sinf(global_time + PI)*t);
+        Vector3 v3 = make_vector3(0, t, z);
+
+        Vector2 p1 = project_2d_scr(project_3d_2d(v1));
+        Vector2 p2 = project_2d_scr(project_3d_2d(v2));
+        Vector2 p3 = project_2d_scr(project_3d_2d(v3));
+
+        olivec_triangle3uv_bilinear(
+            oc1,
+            p1.x, p1.y, p2.x, p2.y, p3.x, p3.y,
+            0/v1.z, 1/v1.z,
+            1/v2.z, 1/v2.z,
+            0.5/v3.z, 0/v3.z,
+            1/v1.z, 1/v2.z, 1/v3.z,
+            oldstone
+        );
+        olivec_triangle3z(zb1, p1.x, p1.y, p2.x, p2.y, p3.x, p3.y, 1.0f/v1.z, 1.0f/v2.z, 1.0f/v3.z);
+    }
+
+    Olivec_Canvas oc2 = olivec_canvas(pixels2, WIDTH, HEIGHT, WIDTH);
+    olivec_fill(oc2, 0xFF181818);
+    Olivec_Canvas zb2 = olivec_canvas((uint32_t*)zbuffer2, WIDTH, HEIGHT, WIDTH);
+    olivec_fill(zb2, 0);
+
+    {
+        Vector3 v1 = make_vector3(cosf(global_time + PI/2)*t, -t, z + sinf(global_time + PI/2)*t);
+        Vector3 v2 = make_vector3(cosf(global_time + PI + PI/2)*t, -t, z + sinf(global_time + PI + PI/2)*t);
+        Vector3 v3 = make_vector3(0, t, z);
+
+        Vector2 p1 = project_2d_scr(project_3d_2d(v1));
+        Vector2 p2 = project_2d_scr(project_3d_2d(v2));
+        Vector2 p3 = project_2d_scr(project_3d_2d(v3));
+
+        olivec_triangle3uv_bilinear(
+            oc2,
+            p1.x, p1.y, p2.x, p2.y, p3.x, p3.y,
+            0/v1.z, 1/v1.z,
+            1/v2.z, 1/v2.z,
+            0.5/v3.z, 0/v3.z,
+            1/v1.z, 1/v2.z, 1/v3.z,
+            lavastone
+        );
+
+        olivec_triangle3z(zb2, p1.x, p1.y, p2.x, p2.y, p3.x, p3.y, 1.0f/v1.z, 1.0f/v2.z, 1.0f/v3.z);
+    }
+
+    for (size_t y = 0; y < HEIGHT; ++y) {
+        for (size_t x = 0; x < WIDTH; ++x) {
+            float z1 = *(float*)&OLIVEC_PIXEL(zb1, x, y);
+            float z2 = *(float*)&OLIVEC_PIXEL(zb2, x, y);
+            if (z1 < z2) {
+                OLIVEC_PIXEL(oc1, x, y) = OLIVEC_PIXEL(oc2, x, y);
+                z1 = z2;
+            }
+            z1 = 1.0f/z1;
+            if (z1 >= 1.0) {
+                z1 -= 1.0;
+                uint32_t v = z1*255;
+                if (v > 255) v = 255;
+                olivec_blend_color(&OLIVEC_PIXEL(oc1, x, y), (v<<(3*8)));
+            }
+        }
+    }
+
+    return oc1;
+}

demos/triangleTex.c

@@ -0,0 +1,60 @@
+#include "vc.c"
+#include "assets/tsodinPog.c"
+
+#define WIDTH 960
+#define HEIGHT 720
+#define BACKGROUND_COLOR 0xFF181818
+
+static uint32_t pixels[WIDTH*HEIGHT];
+static float triangle_angle = 0;
+
+float sqrtf(float x);
+float atan2f(float y, float x);
+float sinf(float x);
+float cosf(float x);
+
+#define PI 3.14159265359
+
+Olivec_Canvas vc_render(float dt)
+{
+    Olivec_Canvas oc = olivec_canvas(pixels, WIDTH, HEIGHT, WIDTH);
+    Olivec_Canvas tsodinPog = olivec_canvas(tsodinPog_pixels, tsodinPog_width, tsodinPog_height, tsodinPog_width);
+
+    olivec_fill(oc, BACKGROUND_COLOR);
+
+    // Triangle
+    {
+        triangle_angle += 0.5f*PI*dt;
+
+        float ps[4][2];
+        float uvs[4][2] = {
+            {0, 0},
+            {1, 0},
+            {1, 1},
+            {0, 1},
+        };
+        float len = WIDTH/4;
+        for (size_t i = 0; i < 4; ++i) {
+            ps[i][0] = WIDTH/2  + cosf(PI/2*i + triangle_angle)*len;
+            ps[i][1] = HEIGHT/2 + sinf(PI/2*i + triangle_angle)*len;
+        }
+        for (size_t i = 0; i < 2; ++i) {
+            int i1 = (i*2 + 0)%4;
+            int i2 = (i*2 + 1)%4;
+            int i3 = (i*2 + 2)%4;
+            olivec_triangle3uv_bilinear(
+                oc,
+                ps[i1][0], ps[i1][1],
+                ps[i2][0], ps[i2][1],
+                ps[i3][0], ps[i3][1],
+                uvs[i1][0], uvs[i1][1],
+                uvs[i2][0], uvs[i2][1],
+                uvs[i3][0], uvs[i3][1],
+                1, 1, 1,
+                tsodinPog
+            );
+       }
+    }
+
+    return oc;
+}

demos/vc.c

@@ -12,7 +12,7 @@
 // #define HEIGHT 600
 // static uint32_t pixels[WIDTH*HEIGHT];
 //
-// Olivec_Canvas render(float dt)
+// static Olivec_Canvas vc_render(float dt)
 // {
 //     Olivec_Canvas oc = olivec_canvas(pixels, WIDTH, HEIGHT, WIDTH);
 //     // ...
@@ -24,44 +24,42 @@
 //
 // # Build
 // ```console
-// $ clang -o demo.sdl -DPLATFORM=SDL_PLATFORM demo.c -lSDL2
-// $ clang -o demo.term -DPLATFORM=TERM_PLATFORM demo.c
-// $ clang -fno-builtin --target=wasm32 --no-standard-libraries -Wl,--no-entry -Wl,--export=render -Wl,--allow-undefined -o demo.wasm -DPLATFORM=WASM_PLATFORM demo.c
+// $ clang -o demo.sdl -DVC_PLATFORM=VC_SDL_PLATFORM demo.c -lSDL2
+// $ clang -o demo.term -DVC_PLATFORM=VC_TERM_PLATFORM demo.c
+// $ clang -fno-builtin --target=wasm32 --no-standard-libraries -Wl,--no-entry -Wl,--export=render -Wl,--allow-undefined -o demo.wasm -DVC_PLATFORM=VC_WASM_PLATFORM demo.c
 // ```
 
 #define OLIVEC_IMPLEMENTATION
 #include <olive.c>
 
-// TODO: prefix VC api elements with vc_*
-// Like vc_render, VC_WASM_PLATFORM, VC_SCALE_DOWN_FACTOR, etc.
+Olivec_Canvas vc_render(float dt);
 
-Olivec_Canvas render(float dt);
-
-#define WASM_PLATFORM 0
-#define SDL_PLATFORM 1
-#define TERM_PLATFORM 2
-
-#ifndef PLATFORM
-#error "Please define PLATFORM macro"
+#ifndef VC_PLATFORM
+#error "Please define VC_PLATFORM macro"
 #endif
 
-#if PLATFORM == SDL_PLATFORM
+// Possible values of VC_PLATFORM
+#define VC_WASM_PLATFORM 0
+#define VC_SDL_PLATFORM 1
+#define VC_TERM_PLATFORM 2
+
+#if VC_PLATFORM == VC_SDL_PLATFORM
 #include <stdio.h>
 #include <SDL2/SDL.h>
 
 #define return_defer(value) do { result = (value); goto defer; } while (0)
 
-SDL_Texture *texture = NULL;
-size_t actual_width = 0;
-size_t actual_height = 0;
+static SDL_Texture *vc_sdl_texture = NULL;
+static size_t vc_sdl_actual_width = 0;
+static size_t vc_sdl_actual_height = 0;
 
-bool resize_texture(SDL_Renderer *renderer, size_t new_width, size_t new_height)
+static bool vc_sdl_resize_texture(SDL_Renderer *renderer, size_t new_width, size_t new_height)
 {
-    if (texture != NULL) SDL_DestroyTexture(texture);
-    actual_width = new_width;
-    actual_height = new_height;
-    texture = SDL_CreateTexture(renderer, SDL_PIXELFORMAT_RGBA32, SDL_TEXTUREACCESS_STREAMING, actual_width, actual_height);
-    if (texture == NULL) return false;
+    if (vc_sdl_texture != NULL) SDL_DestroyTexture(vc_sdl_texture);
+    vc_sdl_actual_width = new_width;
+    vc_sdl_actual_height = new_height;
+    vc_sdl_texture = SDL_CreateTexture(renderer, SDL_PIXELFORMAT_RGBA32, SDL_TEXTUREACCESS_STREAMING, vc_sdl_actual_width, vc_sdl_actual_height);
+    if (vc_sdl_texture == NULL) return false;
     return true;
 }
 
@@ -82,6 +80,7 @@ int main(void)
         if (renderer == NULL) return_defer(1);
 
         Uint32 prev = SDL_GetTicks();
+        bool pause = false;
         for (;;) {
             // Compute Delta Time
             Uint32 curr = SDL_GetTicks();
@@ -90,29 +89,41 @@ int main(void)
 
             // Flush the events
             SDL_Event event;
-            while (SDL_PollEvent(&event)) if (event.type == SDL_QUIT) return_defer(0);
-
-            // Render the texture
-            Olivec_Canvas oc_src = render(dt);
-            if (oc_src.width != actual_width || oc_src.height != actual_height) {
-                if (!resize_texture(renderer, oc_src.width, oc_src.height)) return_defer(1);
-                SDL_SetWindowSize(window, actual_width, actual_height);
+            while (SDL_PollEvent(&event)) {
+                switch (event.type) {
+                case SDL_QUIT: {
+                    return_defer(0);
+                } break;
+                case SDL_KEYDOWN: {
+                    if (event.key.keysym.sym == SDLK_SPACE) pause = !pause;
+                } break;
+                }
             }
-            void *pixels_dst;
-            int pitch;
-            SDL_Rect window_rect = {0, 0, actual_width, actual_height};
-            if (SDL_LockTexture(texture, &window_rect, &pixels_dst, &pitch) < 0) return_defer(1);
-            for (size_t y = 0; y < actual_height; ++y) {
-                // TODO: it would be cool if Olivec_Canvas supported pitch in bytes instead of pixels
-                // It would be more flexible
-                memcpy(pixels_dst + y*pitch, oc_src.pixels + y*actual_width, actual_width*sizeof(uint32_t));
+
+            SDL_Rect window_rect = {0, 0, vc_sdl_actual_width, vc_sdl_actual_height};
+
+            if (!pause) {
+                // Render the texture
+                Olivec_Canvas oc_src = vc_render(dt);
+                if (oc_src.width != vc_sdl_actual_width || oc_src.height != vc_sdl_actual_height) {
+                    if (!vc_sdl_resize_texture(renderer, oc_src.width, oc_src.height)) return_defer(1);
+                    SDL_SetWindowSize(window, vc_sdl_actual_width, vc_sdl_actual_height);
+                }
+                void *pixels_dst;
+                int pitch;
+                if (SDL_LockTexture(vc_sdl_texture, &window_rect, &pixels_dst, &pitch) < 0) return_defer(1);
+                for (size_t y = 0; y < vc_sdl_actual_height; ++y) {
+                    // TODO: it would be cool if Olivec_Canvas supported pitch in bytes instead of pixels
+                    // It would be more flexible and we could draw on the locked texture memory directly
+                    memcpy((char*)pixels_dst + y*pitch, oc_src.pixels + y*vc_sdl_actual_width, vc_sdl_actual_width*sizeof(uint32_t));
+                }
+                SDL_UnlockTexture(vc_sdl_texture);
             }
-            SDL_UnlockTexture(texture);
 
             // Display the texture
             if (SDL_SetRenderDrawColor(renderer, 0, 0, 0, 0) < 0) return_defer(1);
             if (SDL_RenderClear(renderer) < 0) return_defer(1);
-            if (SDL_RenderCopy(renderer, texture, &window_rect, &window_rect) < 0) return_defer(1);
+            if (SDL_RenderCopy(renderer, vc_sdl_texture, &window_rect, &window_rect) < 0) return_defer(1);
             SDL_RenderPresent(renderer);
         }
     }
@@ -125,13 +136,13 @@ defer:
     default:
         fprintf(stderr, "SDL ERROR: %s\n", SDL_GetError());
     }
-    if (texture) SDL_DestroyTexture(texture);
+    if (vc_sdl_texture) SDL_DestroyTexture(vc_sdl_texture);
     if (renderer) SDL_DestroyRenderer(renderer);
     if (window) SDL_DestroyWindow(window);
     SDL_Quit();
     return result;
 }
-#elif PLATFORM == TERM_PLATFORM
+#elif VC_PLATFORM == VC_TERM_PLATFORM
 
 #include <assert.h>
 #include <stdio.h>
@@ -140,31 +151,297 @@ defer:
 #include <errno.h>
 #include <time.h>
 #include <unistd.h>
+#include <math.h>
+
+#define STB_IMAGE_WRITE_IMPLEMENTATION
+#include "stb_image_write.h"
+
+static size_t vc_term_actual_width = 0;
+static size_t vc_term_actual_height = 0;
+static size_t vc_term_scaled_down_width = 0;
+static size_t vc_term_scaled_down_height = 0;
+static int *vc_term_char_canvas = 0;
+
+int hsl256[][3] = {
+    {0, 0, 0},
+    {0, 100, 25},
+    {120, 100, 25},
+    {60, 100, 25},
+    {240, 100, 25},
+    {300, 100, 25},
+    {180, 100, 25},
+    {0, 0, 75},
+    {0, 0, 50},
+    {0, 100, 50},
+    {120, 100, 50},
+    {60, 100, 50},
+    {240, 100, 50},
+    {300, 100, 50},
+    {180, 100, 50},
+    {0, 0, 100},
+    {0, 0, 0},
+    {240, 99, 18},
+    {240, 100, 26},
+    {240, 100, 34},
+    {240, 100, 42},
+    {240, 100, 50},
+    {120, 99, 18},
+    {180, 99, 18},
+    {197, 100, 26},
+    {207, 100, 34},
+    {213, 100, 42},
+    {217, 100, 50},
+    {120, 100, 26},
+    {162, 100, 26},
+    {180, 100, 26},
+    {193, 100, 34},
+    {202, 100, 42},
+    {208, 100, 50},
+    {120, 100, 34},
+    {152, 100, 34},
+    {166, 100, 34},
+    {180, 100, 34},
+    {191, 100, 42},
+    {198, 100, 50},
+    {120, 100, 42},
+    {146, 100, 42},
+    {157, 100, 42},
+    {168, 100, 42},
+    {180, 100, 42},
+    {189, 100, 50},
+    {120, 100, 50},
+    {142, 100, 50},
+    {151, 100, 50},
+    {161, 100, 50},
+    {170, 100, 50},
+    {180, 100, 50},
+    {0, 99, 18},
+    {300, 99, 18},
+    {282, 100, 26},
+    {272, 100, 34},
+    {266, 100, 42},
+    {262, 100, 50},
+    {60, 99, 18},
+    {0, 0, 37},
+    {240, 17, 45},
+    {240, 33, 52},
+    {240, 60, 60},
+    {240, 100, 68},
+    {77, 100, 26},
+    {120, 17, 45},
+    {180, 17, 45},
+    {210, 33, 52},
+    {220, 60, 60},
+    {225, 100, 68},
+    {87, 100, 34},
+    {120, 33, 52},
+    {150, 33, 52},
+    {180, 33, 52},
+    {200, 60, 60},
+    {210, 100, 68},
+    {93, 100, 42},
+    {120, 60, 60},
+    {140, 60, 60},
+    {160, 60, 60},
+    {180, 60, 60},
+    {195, 100, 68},
+    {97, 100, 50},
+    {120, 100, 68},
+    {135, 100, 68},
+    {150, 100, 68},
+    {165, 100, 68},
+    {180, 100, 68},
+    {0, 100, 26},
+    {317, 100, 26},
+    {300, 100, 26},
+    {286, 100, 34},
+    {277, 100, 42},
+    {271, 100, 50},
+    {42, 100, 26},
+    {0, 17, 45},
+    {300, 17, 45},
+    {270, 33, 52},
+    {260, 60, 60},
+    {255, 100, 68},
+    {60, 100, 26},
+    {60, 17, 45},
+    {0, 0, 52},
+    {240, 20, 60},
+    {240, 50, 68},
+    {240, 100, 76},
+    {73, 100, 34},
+    {90, 33, 52},
+    {120, 20, 60},
+    {180, 20, 60},
+    {210, 50, 68},
+    {220, 100, 76},
+    {82, 100, 42},
+    {100, 60, 60},
+    {120, 50, 68},
+    {150, 50, 68},
+    {180, 50, 68},
+    {200, 100, 76},
+    {88, 100, 50},
+    {105, 100, 68},
+    {120, 100, 76},
+    {140, 100, 76},
+    {160, 100, 76},
+    {180, 100, 76},
+    {0, 100, 34},
+    {327, 100, 34},
+    {313, 100, 34},
+    {300, 100, 34},
+    {288, 100, 42},
+    {281, 100, 50},
+    {32, 100, 34},
+    {0, 33, 52},
+    {330, 33, 52},
+    {300, 33, 52},
+    {280, 60, 60},
+    {270, 100, 68},
+    {46, 100, 34},
+    {30, 33, 52},
+    {0, 20, 60},
+    {300, 20, 60},
+    {270, 50, 68},
+    {260, 100, 76},
+    {60, 100, 34},
+    {60, 33, 52},
+    {60, 20, 60},
+    {0, 0, 68},
+    {240, 33, 76},
+    {240, 100, 84},
+    {71, 100, 42},
+    {80, 60, 60},
+    {90, 50, 68},
+    {120, 33, 76},
+    {180, 33, 76},
+    {210, 100, 84},
+    {78, 100, 50},
+    {90, 100, 68},
+    {100, 100, 76},
+    {120, 100, 84},
+    {150, 100, 84},
+    {180, 100, 84},
+    {0, 100, 42},
+    {333, 100, 42},
+    {322, 100, 42},
+    {311, 100, 42},
+    {300, 100, 42},
+    {290, 100, 50},
+    {26, 100, 42},
+    {0, 60, 60},
+    {340, 60, 60},
+    {320, 60, 60},
+    {300, 60, 60},
+    {285, 100, 68},
+    {37, 100, 42},
+    {20, 60, 60},
+    {0, 50, 68},
+    {330, 50, 68},
+    {300, 50, 68},
+    {280, 100, 76},
+    {48, 100, 42},
+    {40, 60, 60},
+    {30, 50, 68},
+    {0, 33, 76},
+    {300, 33, 76},
+    {270, 100, 84},
+    {60, 100, 42},
+    {60, 60, 60},
+    {60, 50, 68},
+    {60, 33, 76},
+    {0, 0, 84},
+    {240, 100, 92},
+    {69, 100, 50},
+    {75, 100, 68},
+    {80, 100, 76},
+    {90, 100, 84},
+    {120, 100, 92},
+    {180, 100, 92},
+    {0, 100, 50},
+    {337, 100, 50},
+    {328, 100, 50},
+    {318, 100, 50},
+    {309, 100, 50},
+    {300, 100, 50},
+    {22, 100, 50},
+    {0, 100, 68},
+    {345, 100, 68},
+    {330, 100, 68},
+    {315, 100, 68},
+    {300, 100, 68},
+    {31, 100, 50},
+    {15, 100, 68},
+    {0, 100, 76},
+    {340, 100, 76},
+    {320, 100, 76},
+    {300, 100, 76},
+    {41, 100, 50},
+    {30, 100, 68},
+    {20, 100, 76},
+    {0, 100, 84},
+    {330, 100, 84},
+    {300, 100, 84},
+    {50, 100, 50},
+    {45, 100, 68},
+    {40, 100, 76},
+    {30, 100, 84},
+    {0, 100, 92},
+    {300, 100, 92},
+    {60, 100, 50},
+    {60, 100, 68},
+    {60, 100, 76},
+    {60, 100, 84},
+    {60, 100, 92},
+    {0, 0, 100},
+    {0, 0, 3},
+    {0, 0, 7},
+    {0, 0, 10},
+    {0, 0, 14},
+    {0, 0, 18},
+    {0, 0, 22},
+    {0, 0, 26},
+    {0, 0, 30},
+    {0, 0, 34},
+    {0, 0, 38},
+    {0, 0, 42},
+    {0, 0, 46},
+    {0, 0, 50},
+    {0, 0, 54},
+    {0, 0, 58},
+    {0, 0, 61},
+    {0, 0, 65},
+    {0, 0, 69},
+    {0, 0, 73},
+    {0, 0, 77},
+    {0, 0, 81},
+    {0, 0, 85},
+    {0, 0, 89},
+    {0, 0, 93},
+};
+
+int distance_hsl256(int i, int h, int s, int l)
+{
+    int dh = h - hsl256[i][0];
+    int ds = s - hsl256[i][1];
+    int dl = l - hsl256[i][2];
+    return dh*dh + ds*ds + dl*dl;
+}
 
-static size_t actual_width = 0;
-static size_t actual_height = 0;
-static size_t scaled_down_width = 0;
-static size_t scaled_down_height = 0;
-static char *char_canvas = 0;
-
-// TODO: use ANSI terminal colors for color_to_char
-char color_to_char(uint32_t pixel)
+// TODO: bring find_ansi_index_by_rgb from image2term
+int find_ansi_index_by_hsl(int h, int s, int l)
 {
-    size_t r = OLIVEC_RED(pixel);
-    size_t g = OLIVEC_GREEN(pixel);
-    size_t b = OLIVEC_BLUE(pixel);
-    size_t a = OLIVEC_ALPHA(pixel);
-    size_t bright = r;
-    if (bright < g) bright = g;
-    if (bright < b) bright = b;
-    bright = bright*a/255;
-
-    char table[] = " .:a@#";
-    size_t n = sizeof(table) - 1;
-    return table[bright*n/256];
+    int index = 0;
+    for (int i = 0; i < 256; ++i) {
+        if (distance_hsl256(i, h, s, l) < distance_hsl256(index, h, s, l)) {
+            index = i;
+        }
+    }
+    return index;
 }
 
-uint32_t compress_pixels_chunk(Olivec_Canvas oc)
+static uint32_t vc_term_compress_pixels_chunk(Olivec_Canvas oc)
 {
     size_t r = 0;
     size_t g = 0;
@@ -188,32 +465,78 @@ uint32_t compress_pixels_chunk(Olivec_Canvas oc)
     return OLIVEC_RGBA(r, g, b, a);
 }
 
-void resize_char_canvas(size_t new_width, size_t new_height)
+#ifndef VC_TERM_SCALE_DOWN_FACTOR
+#define VC_TERM_SCALE_DOWN_FACTOR 20
+#endif // VC_TERM_SCALE_DOWN_FACTOR
+
+static void vc_term_resize_char_canvas(size_t new_width, size_t new_height)
 {
+    // TODO: warn the user if vc_term_actual_width does not fit into the screen
     // TODO: can we just do something so the divisibility is not important?
     // Like round the stuff or something?
-    assert(new_width%SCALE_DOWN_FACTOR == 0 && "Width must be divisible by SCALE_DOWN_FACTOR");
-    assert(new_height%SCALE_DOWN_FACTOR == 0 && "Height must be divisible by SCALE_DOWN_FACTOR");
-    actual_width = new_width;
-    actual_height = new_height;
-    scaled_down_width  = actual_width/SCALE_DOWN_FACTOR;
-    scaled_down_height = actual_height/SCALE_DOWN_FACTOR;
-    free(char_canvas);
-    char_canvas = malloc(sizeof(*char_canvas)*scaled_down_width*scaled_down_height);
-    assert(char_canvas != NULL && "Just buy more RAM");
+    // Or we can resize the frame on the fly similarly to how we resize sprites in olivec_sprite_*() functions.
+    assert(new_width%VC_TERM_SCALE_DOWN_FACTOR == 0 && "Width must be divisible by VC_TERM_SCALE_DOWN_FACTOR");
+    assert(new_height%VC_TERM_SCALE_DOWN_FACTOR == 0 && "Height must be divisible by VC_TERM_SCALE_DOWN_FACTOR");
+    vc_term_actual_width = new_width;
+    vc_term_actual_height = new_height;
+    vc_term_scaled_down_width  = vc_term_actual_width/VC_TERM_SCALE_DOWN_FACTOR;
+    vc_term_scaled_down_height = vc_term_actual_height/VC_TERM_SCALE_DOWN_FACTOR;
+    free(vc_term_char_canvas);
+    vc_term_char_canvas = malloc(sizeof(*vc_term_char_canvas)*vc_term_scaled_down_width*vc_term_scaled_down_height);
+    assert(vc_term_char_canvas != NULL && "Just buy more RAM");
 }
 
-void compress_pixels(Olivec_Canvas oc)
+void rgb_to_hsl(int r, int g, int b, int *h, int *s, int *l)
 {
-    if (actual_width != oc.width || actual_height != oc.height) {
-        resize_char_canvas(oc.width, oc.height);
+    float r01 = r/255.0f;
+    float g01 = g/255.0f;
+    float b01 = b/255.0f;
+    float cmax = r01;
+    if (g01 > cmax) cmax = g01;
+    if (b01 > cmax) cmax = b01;
+    float cmin = r01;
+    if (g01 < cmin) cmin = g01;
+    if (b01 < cmin) cmin = b01;
+    float delta = cmax - cmin;
+    float epsilon = 1e-6;
+    float hf = 0;
+    if (delta < epsilon) hf = 0;
+    else if (cmax == r01) hf = 60.0f*fmod((g01 - b01)/delta, 6.0f);
+    else if (cmax == g01) hf = 60.0f*((b01 - r01)/delta + 2);
+    else if (cmax == b01) hf = 60.0f*((r01 - g01)/delta + 4);
+    else assert(0 && "unreachable");
+
+    float lf = (cmax + cmin)/2;
+
+    float sf = 0;
+    if (delta < epsilon) sf = 0;
+    else sf = delta/(1 - fabsf(2*lf - 1));
+
+    *h = fmodf(fmodf(hf, 360.0f) + 360.0f, 360.0f);
+    *s = sf*100.0f;
+    *l = lf*100.0f;
+}
+
+static void vc_term_compress_pixels(Olivec_Canvas oc)
+{
+    if (vc_term_actual_width != oc.width || vc_term_actual_height != oc.height) {
+        vc_term_resize_char_canvas(oc.width, oc.height);
     }
 
-    for (size_t y = 0; y < scaled_down_height; ++y) {
-        for (size_t x = 0; x < scaled_down_width; ++x) {
-            Olivec_Canvas soc = olivec_subcanvas(oc, x*SCALE_DOWN_FACTOR, y*SCALE_DOWN_FACTOR, SCALE_DOWN_FACTOR, 
-SCALE_DOWN_FACTOR);
-            char_canvas[y*scaled_down_width + x] = color_to_char(compress_pixels_chunk(soc));
+    for (size_t y = 0; y < vc_term_scaled_down_height; ++y) {
+        for (size_t x = 0; x < vc_term_scaled_down_width; ++x) {
+            Olivec_Canvas soc = olivec_subcanvas(oc, x*VC_TERM_SCALE_DOWN_FACTOR, y*VC_TERM_SCALE_DOWN_FACTOR, VC_TERM_SCALE_DOWN_FACTOR, VC_TERM_SCALE_DOWN_FACTOR);
+            uint32_t cp = vc_term_compress_pixels_chunk(soc);
+            int r = OLIVEC_RED(cp);
+            int g = OLIVEC_GREEN(cp);
+            int b = OLIVEC_BLUE(cp);
+            int a = OLIVEC_ALPHA(cp);
+            r = a*r/255;
+            g = a*g/255;
+            b = a*b/255;
+            int h, s, l;
+            rgb_to_hsl(r, g, b, &h, &s, &l);
+            vc_term_char_canvas[y*vc_term_scaled_down_width + x] = find_ansi_index_by_hsl(h, s, l);
         }
     }
 }
@@ -221,27 +544,23 @@ SCALE_DOWN_FACTOR);
 int main(void)
 {
     for (;;) {
-        compress_pixels(render(1.f/60.f));
-        for (size_t y = 0; y < scaled_down_height; ++y) {
-            for (size_t x = 0; x < scaled_down_width; ++x) {
-                // TODO: different halfs of the double pixels
-                // We can do stuff like putc('<', stdout); putc('>', stdout);
-                putc(char_canvas[y*scaled_down_width + x], stdout);
-                putc(char_canvas[y*scaled_down_width + x], stdout);
+        vc_term_compress_pixels(vc_render(1.f/60.f));
+        for (size_t y = 0; y < vc_term_scaled_down_height; ++y) {
+            for (size_t x = 0; x < vc_term_scaled_down_width; ++x) {
                 // TODO: explore the idea of figuring out aspect ratio of the character using escape ANSI codes of the terminal and rendering the image accordingly
+                printf("\033[48;5;%dm  ", vc_term_char_canvas[y*vc_term_scaled_down_width + x]);
             }
-            putc('\n', stdout);
+            printf("\033[0m\n");
         }
 
         usleep(1000*1000/60);
-        printf("\033[%zuA", scaled_down_height);
-        printf("\033[%zuD", scaled_down_width);
+        printf("\033[%zuA", vc_term_scaled_down_height);
+        printf("\033[%zuD", vc_term_scaled_down_width);
     }
     return 0;
 }
-
-#elif PLATFORM == WASM_PLATFORM
-// Do nothing
+#elif VC_PLATFORM == VC_WASM_PLATFORM
+// Do nothing because all the work is done in ../js/vc.js
 #else
-#error "Unknown platform"
-#endif // SDL_PLATFORM
+#error "Unknown VC platform"
+#endif // VC_SDL_PLATFORM

dev-deps/sv.h

@@ -0,0 +1,318 @@
+// Copyright 2021 Alexey Kutepov <[email protected]>
+
+// Permission is hereby granted, free of charge, to any person obtaining
+// a copy of this software and associated documentation files (the
+// "Software"), to deal in the Software without restriction, including
+// without limitation the rights to use, copy, modify, merge, publish,
+// distribute, sublicense, and/or sell copies of the Software, and to
+// permit persons to whom the Software is furnished to do so, subject to
+// the following conditions:
+
+// The above copyright notice and this permission notice shall be
+// included in all copies or substantial portions of the Software.
+
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+#ifndef SV_H_
+#define SV_H_
+
+#include <stdint.h>
+#include <stdlib.h>
+#include <stdbool.h>
+#include <string.h>
+#include <ctype.h>
+
+#ifndef SVDEF
+#define SVDEF
+#endif // SVDEF
+
+typedef struct {
+    size_t count;
+    const char *data;
+} String_View;
+
+#define SV(cstr_lit) sv_from_parts(cstr_lit, sizeof(cstr_lit) - 1)
+#define SV_STATIC(cstr_lit)   \
+    {                         \
+        sizeof(cstr_lit) - 1, \
+        (cstr_lit)            \
+    }
+
+#define SV_NULL sv_from_parts(NULL, 0)
+
+// printf macros for String_View
+#define SV_Fmt "%.*s"
+#define SV_Arg(sv) (int) (sv).count, (sv).data
+// USAGE:
+//   String_View name = ...;
+//   printf("Name: "SV_Fmt"\n", SV_Arg(name));
+
+SVDEF String_View sv_from_parts(const char *data, size_t count);
+SVDEF String_View sv_from_cstr(const char *cstr);
+SVDEF String_View sv_trim_left(String_View sv);
+SVDEF String_View sv_trim_right(String_View sv);
+SVDEF String_View sv_trim(String_View sv);
+SVDEF String_View sv_take_left_while(String_View sv, bool (*predicate)(char x));
+SVDEF String_View sv_chop_by_delim(String_View *sv, char delim);
+SVDEF String_View sv_chop_by_sv(String_View *sv, String_View thicc_delim);
+SVDEF bool sv_try_chop_by_delim(String_View *sv, char delim, String_View *chunk);
+SVDEF String_View sv_chop_left(String_View *sv, size_t n);
+SVDEF String_View sv_chop_right(String_View *sv, size_t n);
+SVDEF String_View sv_chop_left_while(String_View *sv, bool (*predicate)(char x));
+SVDEF bool sv_index_of(String_View sv, char c, size_t *index);
+SVDEF bool sv_eq(String_View a, String_View b);
+SVDEF bool sv_eq_ignorecase(String_View a, String_View b);
+SVDEF bool sv_starts_with(String_View sv, String_View prefix);
+SVDEF bool sv_ends_with(String_View sv, String_View suffix);
+SVDEF uint64_t sv_to_u64(String_View sv);
+
+#endif  // SV_H_
+
+#ifdef SV_IMPLEMENTATION
+
+SVDEF String_View sv_from_parts(const char *data, size_t count)
+{
+    String_View sv;
+    sv.count = count;
+    sv.data = data;
+    return sv;
+}
+
+SVDEF String_View sv_from_cstr(const char *cstr)
+{
+    return sv_from_parts(cstr, strlen(cstr));
+}
+
+SVDEF String_View sv_trim_left(String_View sv)
+{
+    size_t i = 0;
+    while (i < sv.count && isspace(sv.data[i])) {
+        i += 1;
+    }
+
+    return sv_from_parts(sv.data + i, sv.count - i);
+}
+
+SVDEF String_View sv_trim_right(String_View sv)
+{
+    size_t i = 0;
+    while (i < sv.count && isspace(sv.data[sv.count - 1 - i])) {
+        i += 1;
+    }
+
+    return sv_from_parts(sv.data, sv.count - i);
+}
+
+SVDEF String_View sv_trim(String_View sv)
+{
+    return sv_trim_right(sv_trim_left(sv));
+}
+
+SVDEF String_View sv_chop_left(String_View *sv, size_t n)
+{
+    if (n > sv->count) {
+        n = sv->count;
+    }
+
+    String_View result = sv_from_parts(sv->data, n);
+
+    sv->data  += n;
+    sv->count -= n;
+
+    return result;
+}
+
+SVDEF String_View sv_chop_right(String_View *sv, size_t n)
+{
+    if (n > sv->count) {
+        n = sv->count;
+    }
+
+    String_View result = sv_from_parts(sv->data + sv->count - n, n);
+
+    sv->count -= n;
+
+    return result;
+}
+
+SVDEF bool sv_index_of(String_View sv, char c, size_t *index)
+{
+    size_t i = 0;
+    while (i < sv.count && sv.data[i] != c) {
+        i += 1;
+    }
+
+    if (i < sv.count) {
+        if (index) {
+            *index = i;
+        }
+        return true;
+    } else {
+        return false;
+    }
+}
+
+SVDEF bool sv_try_chop_by_delim(String_View *sv, char delim, String_View *chunk)
+{
+    size_t i = 0;
+    while (i < sv->count && sv->data[i] != delim) {
+        i += 1;
+    }
+
+    String_View result = sv_from_parts(sv->data, i);
+
+    if (i < sv->count) {
+        sv->count -= i + 1;
+        sv->data  += i + 1;
+        if (chunk) {
+            *chunk = result;
+        }
+        return true;
+    }
+
+    return false;
+}
+
+SVDEF String_View sv_chop_by_delim(String_View *sv, char delim)
+{
+    size_t i = 0;
+    while (i < sv->count && sv->data[i] != delim) {
+        i += 1;
+    }
+
+    String_View result = sv_from_parts(sv->data, i);
+
+    if (i < sv->count) {
+        sv->count -= i + 1;
+        sv->data  += i + 1;
+    } else {
+        sv->count -= i;
+        sv->data  += i;
+    }
+
+    return result;
+}
+
+SVDEF String_View sv_chop_by_sv(String_View *sv, String_View thicc_delim)
+{
+    String_View window = sv_from_parts(sv->data, thicc_delim.count);
+    size_t i = 0;
+    while (i + thicc_delim.count < sv->count 
+        && !(sv_eq(window, thicc_delim))) 
+    {
+        i++;
+        window.data++;
+    }
+
+    String_View result = sv_from_parts(sv->data, i);
+
+    if (i + thicc_delim.count == sv->count) {
+        // include last <thicc_delim.count> characters if they aren't 
+        //  equal to thicc_delim
+        result.count += thicc_delim.count; 
+    }
+    
+    // Chop!
+    sv->data  += i + thicc_delim.count;
+    sv->count -= i + thicc_delim.count;
+
+    return result;
+}
+
+SVDEF bool sv_starts_with(String_View sv, String_View expected_prefix)
+{
+    if (expected_prefix.count <= sv.count) {
+        String_View actual_prefix = sv_from_parts(sv.data, expected_prefix.count);
+        return sv_eq(expected_prefix, actual_prefix);
+    }
+
+    return false;
+}
+
+SVDEF bool sv_ends_with(String_View sv, String_View expected_suffix)
+{
+    if (expected_suffix.count <= sv.count) {
+        String_View actual_suffix = sv_from_parts(sv.data + sv.count - expected_suffix.count, expected_suffix.count);
+        return sv_eq(expected_suffix, actual_suffix);
+    }
+
+    return false;
+}
+
+SVDEF bool sv_eq(String_View a, String_View b)
+{
+    if (a.count != b.count) {
+        return false;
+    } else {
+        return memcmp(a.data, b.data, a.count) == 0;
+    }
+}
+
+SVDEF bool sv_eq_ignorecase(String_View a, String_View b)
+{
+    if (a.count != b.count) {
+        return false;
+    }
+    
+    char x, y;
+    for (size_t i = 0; i < a.count; i++) {
+        x = 'A' <= a.data[i] && a.data[i] <= 'Z'
+              ? a.data[i] + 32
+              : a.data[i];
+        
+        y = 'A' <= b.data[i] && b.data[i] <= 'Z'
+              ? b.data[i] + 32
+              : b.data[i];
+
+        if (x != y) return false;
+    } 
+    return true;
+}
+
+SVDEF uint64_t sv_to_u64(String_View sv)
+{
+    uint64_t result = 0;
+
+    for (size_t i = 0; i < sv.count && isdigit(sv.data[i]); ++i) {
+        result = result * 10 + (uint64_t) sv.data[i] - '0';
+    }
+
+    return result;
+}
+
+uint64_t sv_chop_u64(String_View *sv)
+{
+    uint64_t result = 0;
+    while (sv->count > 0 && isdigit(*sv->data)) {
+        result = result*10 + *sv->data - '0';
+        sv->count -= 1;
+        sv->data += 1;
+    }
+    return result;
+}
+
+SVDEF String_View sv_chop_left_while(String_View *sv, bool (*predicate)(char x))
+{
+    size_t i = 0;
+    while (i < sv->count && predicate(sv->data[i])) {
+        i += 1;
+    }
+    return sv_chop_left(sv, i);
+}
+
+SVDEF String_View sv_take_left_while(String_View sv, bool (*predicate)(char x))
+{
+    size_t i = 0;
+    while (i < sv.count && predicate(sv.data[i])) {
+        i += 1;
+    }
+    return sv_from_parts(sv.data, i);
+}
+
+#endif // SV_IMPLEMENTATION

index.html

@@ -10,29 +10,65 @@
     <p>Below is a bunch of demos written in C using this library compiled to WebAssembly. Every frame of the animations is generated pixel by pixel on CPU without using any special GPU APIs like OpenGL, Metal, etc. </p>
     <p>The source code of the library and the demos is available on GitHub: <a href="https://github.com/tsoding/olive.c">https://github.com/tsoding/olive.c</a></p>
 
-    <h2 id="demo-triangle"><a href="#demo-triangle">Triangle</a></h2>
-    <p>Rainbow triangle together with a transparent circle. Source:&nbsp;<a href="https://github.com/tsoding/olive.c/blob/master/demos/triangle.c">demos/triangle.c</a></p>
-    <canvas id="app-triangle"></canvas>
+    <div id="sec-triangle">
+      <h2 id="demo-triangle"><a href="#demo-triangle">Triangle</a></h2>
+      <p>Rainbow triangle together with a transparent circle. Source:&nbsp;<a href="https://github.com/tsoding/olive.c/blob/master/demos/triangle.c">demos/triangle.c</a></p>
+      <canvas id="app-triangle"></canvas>
+    </div>
 
-    <h2 id="demo-3d"><a href="#demo-3d">3D</a></h2>
-    <p>A bunch of 3D points projected onto your 2D screen plus a text with a builtin monospaced font. Source:&nbsp;<a href="https://github.com/tsoding/olive.c/blob/master/demos/3d.c">demos/3d.c</a></p>
-    <canvas id="app-3d"></canvas>
+    <div id="sec-dots3d">
+      <h2 id="demo-dots3d"><a href="#demo-dots3d">Dots 3D</a></h2>
+      <p>A bunch of 3D dots projected onto your 2D screen plus a text with a builtin monospaced font. Source:&nbsp;<a href="https://github.com/tsoding/olive.c/blob/master/demos/dots3d.c">demos/dots3d.c</a></p>
+      <canvas id="app-dots3d"></canvas>
+    </div>
 
-    <h2 id="demo-squish"><a href="#demo-squish">Squish</a></h2>
-    <p>Resizing images on the fly. Source:&nbsp;<a href="https://github.com/tsoding/olive.c/blob/master/demos/squish.c">demos/squish.c</a></p>
-    <canvas id="app-squish"></canvas>
+    <div id="sec-squish">
+      <h2 id="demo-squish"><a href="#demo-squish">Squish</a></h2>
+      <p>Resizing images on the fly. Source:&nbsp;<a href="https://github.com/tsoding/olive.c/blob/master/demos/squish.c">demos/squish.c</a></p>
+      <canvas id="app-squish"></canvas>
+    </div>
 
-    <h2 id="demo-triangle3d"><a href="#demo-triangle3d">Triangle 3D</a></h2>
-    Rotating rainbow triangle in 3D. Unlike <a href="#demo-3d">3D dots above</a> this is a solid shape. Source:&nbsp;<a href="https://github.com/tsoding/olive.c/blob/master/demos/triangle3d.c">demos/triangle3d.c</a></p>
-    <canvas id="app-triangle3d"></canvas>
+    <div id="sec-triangle3d">
+      <h2 id="demo-triangle3d"><a href="#demo-triangle3d">Triangle 3D</a></h2>
+      <p>Rotating rainbow triangle in 3D. Unlike <a href="#demo-3d">3D dots above</a> this is a solid shape. Source:&nbsp;<a href="https://github.com/tsoding/olive.c/blob/master/demos/triangle3d.c">demos/triangle3d.c</a></p>
+      <canvas id="app-triangle3d"></canvas>
+    </div>
+
+    <div id="sec-triangleTex">
+      <h2 id="demo-triangleTex"><a href="#demo-triangleTex">Rotating 2D Textures</a></h2>
+      <p>Source:&nbsp;<a href="https://github.com/tsoding/olive.c/blob/master/demos/triangleTex.c">demos/triangleTex.c</a></p>
+      <canvas id="app-triangleTex"></canvas>
+    </div>
+
+    <div id="sec-triangle3dTex">
+      <h2 id="demo-triangle3dTex"><a href="#demo-triangle3dTex">Rotating 3D Textures</a></h2>
+      <p>Textures by <a href="https://opengameart.org/content/handpainted-stone-texture">MELLE</a>. Source:&nbsp;<a href="https://github.com/tsoding/olive.c/blob/master/demos/triangle3dTex.c">demos/triangle3dTex.c</a></p>
+      <canvas id="app-triangle3dTex"></canvas>
+    </div>
+
+    <div id="sec-cup3d">
+      <h2 id="demo-cup3d"><a href="#demo-cup3d">Cup 3D</a></h2>
+      <p>Design by <a href="https://github.com/rexim">rexim</a>. 3D model by <a href="https://github.com/kolumb">kolumb</a>. Source:&nbsp;<a href="https://github.com/tsoding/olive.c/blob/master/demos/cup3d.c">demos/cup3d.c</a></p>
+      <canvas id="app-cup3d"></canvas>
+    </div>
+
+    <div id="sec-teapot3d">
+      <h2 id="demo-teapot3d"><a href="#demo-teapot3d">Utah Teapot</a></h2>
+      <p>Famous <a href="https://en.wikipedia.org/wiki/Utah_teapot">Utah Teapot</a>. Model by <a href="https://graphics.stanford.edu/courses/cs148-10-summer/as3/code/as3/teapot.obj">Standford University</a>. Source:&nbsp;<a href="https://github.com/tsoding/olive.c/blob/master/demos/teapot3d.c">demos/cup3d.c</a></p>
+      <p>(I have no idea why it runs with a reasonable FPS)</p>
+      <canvas id="app-teapot3d"></canvas>
+    </div>
 
     <script src="js/vc.js"></script>
     <script>
-      startDemo("app-triangle", "./wasm/triangle.wasm");
-      startDemo("app-3d", "./wasm/3d.wasm");
-      startDemo("app-squish", "./wasm/squish.wasm");
-      startDemo("app-triangle3d", "./wasm/triangle3d.wasm");
-      startDemo("app-squish", "./wasm/squish.wasm");
+      startDemo("triangle", "./wasm/triangle.wasm");
+      startDemo("dots3d", "./wasm/dots3d.wasm");
+      startDemo("squish", "./wasm/squish.wasm");
+      startDemo("triangle3d", "./wasm/triangle3d.wasm");
+      startDemo("triangleTex", "./wasm/triangleTex.wasm");
+      startDemo("triangle3dTex", "./wasm/triangle3dTex.wasm");
+      startDemo("cup3d", "./wasm/cup3d.wasm");
+      startDemo("teapot3d", "./wasm/teapot3d.wasm");
     </script>
   </body>
 </html>

js/vc.js

@@ -40,11 +40,20 @@ function readCanvasFromMemory(memory_buffer, canvas_ptr)
 }
 
 async function startDemo(elementId, wasmPath) {
-    const app = document.getElementById(elementId);
+    const app = document.getElementById(`app-${elementId}`);
     if (app === null) {
-        console.error(`Could not find element ${elementId}. Skipping demo ${wasmPath}...`);
+        console.error(`Could not find element app-${elementId}. Skipping demo ${wasmPath}...`);
         return;
     }
+    const sec = document.getElementById(`sec-${elementId}`);
+    if (sec === null) {
+        console.error(`Could not find element sec-${elementId}. Skipping demo ${wasmPath}...`);
+        return;
+    }
+
+    let paused = true;
+    sec.addEventListener("mouseenter", () => paused = false);
+    sec.addEventListener("mouseleave", () => paused = true);
 
     const ctx = app.getContext("2d");
     const w = await WebAssembly.instantiateStreaming(fetch(wasmPath), {
@@ -54,17 +63,9 @@ async function startDemo(elementId, wasmPath) {
     // TODO: if __heap_base not found tell the user to compile their wasm module with -Wl,--export=__heap_base
     const heap_base = w.instance.exports.__heap_base.value;
 
-    let prev = null;
-    function first(timestamp) {
-        prev = timestamp;
-        window.requestAnimationFrame(loop);
-    }
-    function loop(timestamp) {
-        const dt = timestamp - prev;
-        prev = timestamp;
-
+    function render(dt) {
         const buffer = w.instance.exports.memory.buffer;
-        w.instance.exports.render(heap_base, dt*0.001);
+        w.instance.exports.vc_render(heap_base, dt*0.001);
         const canvas = readCanvasFromMemory(buffer, heap_base);
         if (canvas.width != canvas.stride) {
             // TODO: maybe we can preallocate a Uint8ClampedArray on JavaScript side and just copy the canvas data there to bring width and stride to the same value?
@@ -75,6 +76,18 @@ async function startDemo(elementId, wasmPath) {
         app.width = canvas.width;
         app.height = canvas.height;
         ctx.putImageData(image, 0, 0);
+    }
+
+    let prev = null;
+    function first(timestamp) {
+        prev = timestamp;
+        render(0);
+        window.requestAnimationFrame(loop);
+    }
+    function loop(timestamp) {
+        const dt = timestamp - prev;
+        prev = timestamp;
+        if (!paused) render(dt);
         window.requestAnimationFrame(loop);
     }
     window.requestAnimationFrame(first);

nobuild.c

@@ -0,0 +1,266 @@
+#define NOBUILD_IMPLEMENTATION
+#include "./nobuild.h"
+
+#define COMMON_CFLAGS "-Wall", "-Wextra", "-pedantic", "-std=c99", "-ggdb", "-I.", "-I./build/", "-I./dev-deps/"
+
+void build_tools(void)
+{
+    MKDIRS("build", "tools");
+    CMD("clang", COMMON_CFLAGS, "-o", "./build/tools/png2c", "./tools/png2c.c", "-lm");
+    CMD("clang", COMMON_CFLAGS, "-o", "./build/tools/obj2c", "./tools/obj2c.c", "-lm");
+}
+
+void build_assets(void)
+{
+    MKDIRS("build", "assets");
+    CMD("./build/tools/png2c", "-n", "tsodinPog", "-o", "./build/assets/tsodinPog.c", "./assets/tsodinPog.png");
+    CMD("./build/tools/png2c", "-n", "tsodinCup", "-o", "./build/assets/tsodinCup.c", "./assets/tsodinCup.png");
+    CMD("./build/tools/png2c", "-n", "oldstone", "-o", "./build/assets/oldstone.c", "./assets/oldstone.png");
+    CMD("./build/tools/png2c", "-n", "lavastone", "-o", "./build/assets/lavastone.c", "./assets/lavastone.png");
+    CMD("./build/tools/obj2c", "-o", "./build/assets/tsodinCupLowPoly.c", "./assets/tsodinCupLowPoly.obj");
+    CMD("./build/tools/obj2c", "-s", "0.40", "-o", "./build/assets/utahTeapot.c", "./assets/utahTeapot.obj");
+}
+
+void build_tests(void)
+{
+    CMD("clang", COMMON_CFLAGS, "-fsanitize=memory", "-o", "./build/test", "test.c", "-lm");
+}
+
+// TODO: move copy_file to nobuild.h
+// Maybe even use platform dependent APIs to make it better.
+void copy_file(const char *src_file_path, const char *dst_file_path)
+{
+    INFO("Copying %s -> %s", src_file_path, dst_file_path);
+    size_t buffer_sz = 32*1024;
+    char *buffer = malloc(buffer_sz);
+    if (buffer == NULL) {
+        PANIC("Could not allocate memory to copy file %s -> %s", src_file_path, dst_file_path);
+    }
+
+    FILE *src = fopen(src_file_path, "rb");
+    if (src == NULL) {
+        PANIC("Could not open file %s for reading: %s", src_file_path, strerror(errno));
+    }
+    FILE *dst = fopen(dst_file_path, "wb");
+    if (dst == NULL) {
+        PANIC("Could not open file %s for writing: %s", dst_file_path, strerror(errno));
+    }
+    while (!feof(src)) {
+        size_t n = fread(buffer, 1, buffer_sz, src);
+        if (ferror(src)) {
+            PANIC("Could not read from file %s: %s", src_file_path, strerror(errno));
+        }
+        size_t m = 0;
+        while (m < n) {
+            m += fwrite(buffer + m, 1, n - m, dst);
+            if (ferror(dst)) {
+                PANIC("Could not write to file %s: %s", dst_file_path, strerror(errno));
+            }
+        }
+    }
+    if (fclose(dst) < 0) PANIC("Could not close file %s: %s", dst_file_path, strerror(errno));
+    if (fclose(src) < 0) PANIC("Could not close file %s: %s", src_file_path, strerror(errno));
+}
+
+Pid build_wasm_demo(const char *name)
+{
+    Cmd cmd = {
+        .line = cstr_array_make("clang", COMMON_CFLAGS, "-O2", "-fno-builtin", "--target=wasm32", "--no-standard-libraries", "-Wl,--no-entry", "-Wl,--export=vc_render", "-Wl,--export=__heap_base", "-Wl,--allow-undefined", "-o", CONCAT("./build/demos/", name, ".wasm"), "-DVC_PLATFORM=VC_WASM_PLATFORM", CONCAT("./demos/", name, ".c"), NULL)
+    };
+    INFO("CMD: %s", cmd_show(cmd));
+    return cmd_run_async(cmd, NULL, NULL);
+}
+
+Pid build_term_demo(const char *name)
+{
+    Cmd cmd = {
+        .line = cstr_array_make("clang", COMMON_CFLAGS, "-O2", "-o", CONCAT("./build/demos/", name, ".term"), "-DVC_PLATFORM=VC_TERM_PLATFORM", "-D_XOPEN_SOURCE=600", CONCAT("./demos/", name, ".c"), "-lm", NULL)
+    };
+    INFO("CMD: %s", cmd_show(cmd));
+    return cmd_run_async(cmd, NULL, NULL);
+}
+
+Pid build_sdl_demo(const char *name)
+{
+    Cmd cmd = {
+        .line = cstr_array_make("clang", COMMON_CFLAGS, "-O2", "-o", CONCAT("./build/demos/", name, ".sdl"), "-DVC_PLATFORM=VC_SDL_PLATFORM", CONCAT("./demos/", name, ".c"), "-lm", "-lSDL2", NULL)
+    };
+    INFO("CMD: %s", cmd_show(cmd));
+    return cmd_run_async(cmd, NULL, NULL);
+}
+
+// TODO: move struct Pids, pids_wait() and da_append() to nobuild.h
+
+typedef struct {
+    Pid *items;
+    size_t count;
+    size_t capacity;
+} Pids;
+
+void pids_wait(Pids pids)
+{
+    for (size_t i = 0; i < pids.count; ++i) {
+        pid_wait(pids.items[i]);
+    }
+}
+
+#define DA_INIT_CAPACITY 8192
+#define DA_REALLOC(oldptr, oldsz, newsz) realloc(oldptr, newsz)
+#define da_append(da, item)                                                 \
+    do {                                                                    \
+        if ((da)->count >= (da)->capacity) {                                \
+            size_t new_capacity = (da)->capacity*2;                         \
+            if (new_capacity == 0) {                                        \
+                new_capacity = DA_INIT_CAPACITY;                            \
+            }                                                               \
+                                                                            \
+            (da)->items = DA_REALLOC((da)->items,                           \
+                                     (da)->capacity*sizeof((da)->items[0]), \
+                                     new_capacity*sizeof((da)->items[0]));  \
+            (da)->capacity = new_capacity;                                  \
+        }                                                                   \
+                                                                            \
+        (da)->items[(da)->count++] = (item);                                \
+    } while (0)
+
+void build_vc_demo(const char *name, Pids *pids)
+{
+    da_append(pids, build_wasm_demo(name));
+    da_append(pids, build_term_demo(name));
+    da_append(pids, build_sdl_demo(name));
+}
+
+void build_all_vc_demos(void)
+{
+    MKDIRS("build", "demos");
+    const char *names[] = {
+        "triangle",
+        "dots3d",
+        "squish",
+        "triangle3d",
+        "triangleTex",
+        "triangle3dTex",
+        "cup3d",
+        "teapot3d",
+    };
+    size_t names_sz = sizeof(names)/sizeof(names[0]);
+    size_t thread_count = 6;
+
+    Pids pids = {0};
+    for (size_t i = 0; i < names_sz; ++i) {
+        build_vc_demo(names[i], &pids);
+        if (pids.count >= thread_count) {
+            pids_wait(pids);
+            pids.count = 0;
+        }
+    }
+    pids_wait(pids);
+
+    for (size_t i = 0; i < names_sz; ++i) {
+        copy_file(CONCAT("./build/demos/", names[i], ".wasm"), CONCAT("./wasm/", names[i], ".wasm"));
+    }
+}
+
+void usage(const char *program)
+{
+    INFO("Usage: %s [<subcommand>]", program);
+    INFO("Subcommands:");
+    INFO("    tools");
+    INFO("        Build all the tools. Things like png2c, obj2c, etc.");
+    INFO("    assets");
+    INFO("        Build the assets in the assets/ folder.");
+    INFO("        Basically convert their data to C code so we can bake them in demos.");
+    INFO("    test[s] [<args>]");
+    INFO("        Build and run test.c");
+    INFO("        If <args> are provided the test utility is run with them.");
+    INFO("    demos [<platform>] [run]");
+    INFO("        Build demos.");
+    INFO("        Available platforms are: sdl, term, or wasm.");
+    INFO("        Optional [run] runs the demo after the build.");
+    INFO("        [run] is not available for wasm platform.");
+    INFO("    help");
+    INFO("         Print this message");
+}
+
+int main(int argc, char **argv)
+{
+    GO_REBUILD_URSELF(argc, argv);
+
+    const char *program = shift_args(&argc, &argv);
+
+    if (argc > 0) {
+        const char *subcmd = shift_args(&argc, &argv);
+        if (strcmp(subcmd, "tools") == 0) {
+            build_tools();
+        } else if (strcmp(subcmd, "assets") == 0) {
+            build_assets();
+        } else if (strcmp(subcmd, "tests") == 0 || strcmp(subcmd, "test") == 0) {
+            build_tests();
+            if (argc > 0) {
+                Cmd cmd = {0};
+                cmd.line = cstr_array_append(cmd.line, "./build/test");
+                for (int i = 0; i < argc; ++i) {
+                    cmd.line = cstr_array_append(cmd.line, argv[i]);
+                }
+                cmd.line = cstr_array_append(cmd.line, NULL);
+                cmd_run_sync(cmd);
+            }
+        } else if (strcmp(subcmd, "demos") == 0) {
+            if (argc > 0) {
+                const char *name = shift_args(&argc, &argv);
+
+                if (argc > 0) {
+                    const char *platform = shift_args(&argc, &argv);
+                    if (strcmp(platform, "sdl") == 0) {
+                        pid_wait(build_sdl_demo(name));
+
+                        if (argc > 0) {
+                            const char *run = shift_args(&argc, &argv);
+                            if (strcmp(run, "run") != 0) {
+                                usage(program);
+                                PANIC("unknown action `%s` for SDL demo: %s", run, name);
+                            }
+                            CMD(CONCAT("./build/demos/", name, ".sdl"));
+                        }
+                    } else if (strcmp(platform, "term") == 0) {
+                        pid_wait(build_term_demo(name));
+
+                        if (argc > 0) {
+                            const char *run = shift_args(&argc, &argv);
+                            if (strcmp(run, "run") != 0) {
+                                usage(program);
+                                PANIC("unknown action `%s` for Terminal demo: %s", run, name);
+                            }
+                            CMD(CONCAT("./build/demos/", name, ".term"));
+                        }
+                    } else if (strcmp(platform, "wasm") == 0) {
+                        pid_wait(build_wasm_demo(name));
+                        copy_file(CONCAT("./build/demos/", name, ".wasm"), CONCAT("./wasm/", name, ".wasm"));
+                    } else {
+                        usage(program);
+                        PANIC("unknown demo platform %s", platform);
+                    }
+                } else {
+                    Pids pids = {0};
+                    build_vc_demo(name, &pids);
+                    pids_wait(pids);
+                    copy_file(CONCAT("./build/demos/", name, ".wasm"), CONCAT("./wasm/", name, ".wasm"));
+                }
+            } else {
+                build_all_vc_demos();
+            }
+        } else if(strcmp(subcmd, "help") == 0) {
+            usage(program);
+        } else {
+            usage(program);
+            PANIC("Unknown command `%s`", subcmd);
+        }
+    } else {
+        build_tools();
+        build_assets();
+        build_tests();
+        build_all_vc_demos();
+    }
+
+    return 0;
+}

nobuild.h

@@ -0,0 +1,1151 @@
+#ifndef NOBUILD_H_
+#define NOBUILD_H_
+
+#ifndef _WIN32
+#    define _POSIX_C_SOURCE 200809L
+#    include <sys/types.h>
+#    include <sys/wait.h>
+#    include <sys/stat.h>
+#    include <unistd.h>
+#    include <dirent.h>
+#    include <fcntl.h>
+#    define PATH_SEP "/"
+typedef pid_t Pid;
+typedef int Fd;
+#else
+#    define WIN32_MEAN_AND_LEAN
+#    include "windows.h"
+#    include <process.h>
+#    define PATH_SEP "\\"
+typedef HANDLE Pid;
+typedef HANDLE Fd;
+// minirent.h HEADER BEGIN ////////////////////////////////////////
+// Copyright 2021 Alexey Kutepov <[email protected]>
+//
+// Permission is hereby granted, free of charge, to any person obtaining
+// a copy of this software and associated documentation files (the
+// "Software"), to deal in the Software without restriction, including
+// without limitation the rights to use, copy, modify, merge, publish,
+// distribute, sublicense, and/or sell copies of the Software, and to
+// permit persons to whom the Software is furnished to do so, subject to
+// the following conditions:
+//
+// The above copyright notice and this permission notice shall be
+// included in all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+//
+// ============================================================
+//
+// minirent — 0.0.1 — A subset of dirent interface for Windows.
+//
+// https://github.com/tsoding/minirent
+//
+// ============================================================
+//
+// ChangeLog (https://semver.org/ is implied)
+//
+//    0.0.1 First Official Release
+
+#ifndef MINIRENT_H_
+#define MINIRENT_H_
+
+#define WIN32_LEAN_AND_MEAN
+#include "windows.h"
+
+struct dirent {
+    char d_name[MAX_PATH+1];
+};
+
+typedef struct DIR DIR;
+
+DIR *opendir(const char *dirpath);
+struct dirent *readdir(DIR *dirp);
+int closedir(DIR *dirp);
+
+#endif  // MINIRENT_H_
+// minirent.h HEADER END ////////////////////////////////////////
+
+// TODO(#28): use GetLastErrorAsString everywhere on Windows error reporting
+LPSTR GetLastErrorAsString(void);
+
+#endif  // _WIN32
+
+#include <assert.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdarg.h>
+#include <string.h>
+#include <errno.h>
+
+#define FOREACH_ARRAY(type, elem, array, body)  \
+    for (size_t elem_##index = 0;                           \
+         elem_##index < array.count;                        \
+         ++elem_##index)                                    \
+    {                                                       \
+        type *elem = &array.elems[elem_##index];            \
+        body;                                               \
+    }
+
+typedef const char * Cstr;
+
+int cstr_ends_with(Cstr cstr, Cstr postfix);
+#define ENDS_WITH(cstr, postfix) cstr_ends_with(cstr, postfix)
+
+Cstr cstr_no_ext(Cstr path);
+#define NOEXT(path) cstr_no_ext(path)
+
+typedef struct {
+    Cstr *elems;
+    size_t count;
+} Cstr_Array;
+
+Cstr_Array cstr_array_make(Cstr first, ...);
+Cstr_Array cstr_array_append(Cstr_Array cstrs, Cstr cstr);
+Cstr cstr_array_join(Cstr sep, Cstr_Array cstrs);
+
+#define JOIN(sep, ...) cstr_array_join(sep, cstr_array_make(__VA_ARGS__, NULL))
+#define CONCAT(...) JOIN("", __VA_ARGS__)
+#define PATH(...) JOIN(PATH_SEP, __VA_ARGS__)
+
+typedef struct {
+    Fd read;
+    Fd write;
+} Pipe;
+
+Pipe pipe_make(void);
+
+typedef struct {
+    Cstr_Array line;
+} Cmd;
+
+Fd fd_open_for_read(Cstr path);
+Fd fd_open_for_write(Cstr path);
+void fd_close(Fd fd);
+void pid_wait(Pid pid);
+Cstr cmd_show(Cmd cmd);
+Pid cmd_run_async(Cmd cmd, Fd *fdin, Fd *fdout);
+void cmd_run_sync(Cmd cmd);
+
+typedef struct {
+    Cmd *elems;
+    size_t count;
+} Cmd_Array;
+
+// TODO(#1): no way to disable echo in nobuild scripts
+// TODO(#2): no way to ignore fails
+#define CMD(...)                                        \
+    do {                                                \
+        Cmd cmd = {                                     \
+            .line = cstr_array_make(__VA_ARGS__, NULL)  \
+        };                                              \
+        INFO("CMD: %s", cmd_show(cmd));                 \
+        cmd_run_sync(cmd);                              \
+    } while (0)
+
+typedef enum {
+    CHAIN_TOKEN_END = 0,
+    CHAIN_TOKEN_IN,
+    CHAIN_TOKEN_OUT,
+    CHAIN_TOKEN_CMD
+} Chain_Token_Type;
+
+// A single token for the CHAIN(...) DSL syntax
+typedef struct {
+    Chain_Token_Type type;
+    Cstr_Array args;
+} Chain_Token;
+
+// TODO(#17): IN and OUT are already taken by WinAPI
+#define IN(path) \
+    (Chain_Token) { \
+        .type = CHAIN_TOKEN_IN, \
+        .args = cstr_array_make(path, NULL) \
+    }
+
+#define OUT(path) \
+    (Chain_Token) { \
+        .type = CHAIN_TOKEN_OUT, \
+        .args = cstr_array_make(path, NULL) \
+    }
+
+#define CHAIN_CMD(...) \
+    (Chain_Token) { \
+        .type = CHAIN_TOKEN_CMD, \
+        .args = cstr_array_make(__VA_ARGS__, NULL) \
+    }
+
+// TODO(#20): pipes do not allow redirecting stderr
+typedef struct {
+    Cstr input_filepath;
+    Cmd_Array cmds;
+    Cstr output_filepath;
+} Chain;
+
+Chain chain_build_from_tokens(Chain_Token first, ...);
+void chain_run_sync(Chain chain);
+void chain_echo(Chain chain);
+
+// TODO(#15): PIPE does not report where exactly a syntactic error has happened
+#define CHAIN(...)                                                      \
+    do {                                                                \
+        Chain chain = chain_build_from_tokens(__VA_ARGS__, (Chain_Token) {0}); \
+        chain_echo(chain);                                              \
+        chain_run_sync(chain);                                          \
+    } while(0)
+
+#ifndef REBUILD_URSELF
+#  if _WIN32
+#    if defined(__GNUC__)
+#       define REBUILD_URSELF(binary_path, source_path) CMD("gcc", "-o", binary_path, source_path)
+#    elif defined(__clang__)
+#       define REBUILD_URSELF(binary_path, source_path) CMD("clang", "-o", binary_path, source_path)
+#    elif defined(_MSC_VER)
+#       define REBUILD_URSELF(binary_path, source_path) CMD("cl.exe", source_path)
+#    endif
+#  else
+#    define REBUILD_URSELF(binary_path, source_path) CMD("cc", "-o", binary_path, source_path)
+#  endif
+#endif
+
+// Go Rebuild Urself™ Technology
+//
+//   How to use it:
+//     int main(int argc, char** argv) {
+//         GO_REBUILD_URSELF(argc, argv);
+//         // actual work
+//         return 0;
+//     }
+//
+//   After your added this macro every time you run ./nobuild it will detect
+//   that you modified its original source code and will try to rebuild itself
+//   before doing any actual work. So you only need to bootstrap your build system
+//   once.
+//
+//   The modification is detected by comparing the last modified times of the executable
+//   and its source code. The same way the make utility usually does it.
+//
+//   The rebuilding is done by using the REBUILD_URSELF macro which you can redefine
+//   if you need a special way of bootstraping your build system. (which I personally
+//   do not recommend since the whole idea of nobuild is to keep the process of bootstrapping
+//   as simple as possible and doing all of the actual work inside of the nobuild)
+//
+#define GO_REBUILD_URSELF(argc, argv)                                  \
+    do {                                                               \
+        const char *source_path = __FILE__;                            \
+        assert(argc >= 1);                                             \
+        const char *binary_path = argv[0];                             \
+                                                                       \
+        if (is_path1_modified_after_path2(source_path, binary_path)) { \
+            RENAME(binary_path, CONCAT(binary_path, ".old"));          \
+            REBUILD_URSELF(binary_path, source_path);                  \
+            Cmd cmd = {                                                \
+                .line = {                                              \
+                    .elems = (Cstr*) argv,                             \
+                    .count = argc,                                     \
+                },                                                     \
+            };                                                         \
+            INFO("CMD: %s", cmd_show(cmd));                            \
+            cmd_run_sync(cmd);                                         \
+            exit(0);                                                   \
+        }                                                              \
+    } while(0)
+// The implementation idea is stolen from https://github.com/zhiayang/nabs
+
+void rebuild_urself(const char *binary_path, const char *source_path);
+
+int path_is_dir(Cstr path);
+#define IS_DIR(path) path_is_dir(path)
+
+int path_exists(Cstr path);
+#define PATH_EXISTS(path) path_exists(path)
+
+void path_mkdirs(Cstr_Array path);
+#define MKDIRS(...)                                             \
+    do {                                                        \
+        Cstr_Array path = cstr_array_make(__VA_ARGS__, NULL);   \
+        INFO("MKDIRS: %s", cstr_array_join(PATH_SEP, path));    \
+        path_mkdirs(path);                                      \
+    } while (0)
+
+void path_rename(Cstr old_path, Cstr new_path);
+#define RENAME(old_path, new_path)                    \
+    do {                                              \
+        INFO("RENAME: %s -> %s", old_path, new_path); \
+        path_rename(old_path, new_path);              \
+    } while (0)
+
+void path_rm(Cstr path);
+#define RM(path)                                \
+    do {                                        \
+        INFO("RM: %s", path);                   \
+        path_rm(path);                          \
+    } while(0)
+
+#define FOREACH_FILE_IN_DIR(file, dirpath, body)        \
+    do {                                                \
+        struct dirent *dp = NULL;                       \
+        DIR *dir = opendir(dirpath);                    \
+        if (dir == NULL) {                              \
+            PANIC("could not open directory %s: %s",    \
+                  dirpath, strerror(errno));            \
+        }                                               \
+        errno = 0;                                      \
+        while ((dp = readdir(dir))) {                   \
+            const char *file = dp->d_name;              \
+            body;                                       \
+        }                                               \
+                                                        \
+        if (errno > 0) {                                \
+            PANIC("could not read directory %s: %s",    \
+                  dirpath, strerror(errno));            \
+        }                                               \
+                                                        \
+        closedir(dir);                                  \
+    } while(0)
+
+#if defined(__GNUC__) || defined(__clang__)
+// https://gcc.gnu.org/onlinedocs/gcc-4.7.2/gcc/Function-Attributes.html
+#define NOBUILD_PRINTF_FORMAT(STRING_INDEX, FIRST_TO_CHECK) __attribute__ ((format (printf, STRING_INDEX, FIRST_TO_CHECK)))
+#else
+#define NOBUILD_PRINTF_FORMAT(STRING_INDEX, FIRST_TO_CHECK)
+#endif
+
+void VLOG(FILE *stream, Cstr tag, Cstr fmt, va_list args);
+void INFO(Cstr fmt, ...) NOBUILD_PRINTF_FORMAT(1, 2);
+void WARN(Cstr fmt, ...) NOBUILD_PRINTF_FORMAT(1, 2);
+void ERRO(Cstr fmt, ...) NOBUILD_PRINTF_FORMAT(1, 2);
+void PANIC(Cstr fmt, ...) NOBUILD_PRINTF_FORMAT(1, 2);
+
+char *shift_args(int *argc, char ***argv);
+
+#endif  // NOBUILD_H_
+
+////////////////////////////////////////////////////////////////////////////////
+
+#ifdef NOBUILD_IMPLEMENTATION
+
+#ifdef _WIN32
+LPSTR GetLastErrorAsString(void)
+{
+    // https://stackoverflow.com/questions/1387064/how-to-get-the-error-message-from-the-error-code-returned-by-getlasterror
+
+    DWORD errorMessageId = GetLastError();
+    assert(errorMessageId != 0);
+
+    LPSTR messageBuffer = NULL;
+
+    DWORD size =
+        FormatMessage(
+            FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS, // DWORD   dwFlags,
+            NULL, // LPCVOID lpSource,
+            errorMessageId, // DWORD   dwMessageId,
+            MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), // DWORD   dwLanguageId,
+            (LPSTR) &messageBuffer, // LPTSTR  lpBuffer,
+            0, // DWORD   nSize,
+            NULL // va_list *Arguments
+        );
+
+    return messageBuffer;
+}
+
+// minirent.h IMPLEMENTATION BEGIN ////////////////////////////////////////
+struct DIR {
+    HANDLE hFind;
+    WIN32_FIND_DATA data;
+    struct dirent *dirent;
+};
+
+DIR *opendir(const char *dirpath)
+{
+    assert(dirpath);
+
+    char buffer[MAX_PATH];
+    snprintf(buffer, MAX_PATH, "%s\\*", dirpath);
+
+    DIR *dir = (DIR*)calloc(1, sizeof(DIR));
+
+    dir->hFind = FindFirstFile(buffer, &dir->data);
+    if (dir->hFind == INVALID_HANDLE_VALUE) {
+        errno = ENOSYS;
+        goto fail;
+    }
+
+    return dir;
+
+fail:
+    if (dir) {
+        free(dir);
+    }
+
+    return NULL;
+}
+
+struct dirent *readdir(DIR *dirp)
+{
+    assert(dirp);
+
+    if (dirp->dirent == NULL) {
+        dirp->dirent = (struct dirent*)calloc(1, sizeof(struct dirent));
+    } else {
+        if(!FindNextFile(dirp->hFind, &dirp->data)) {
+            if (GetLastError() != ERROR_NO_MORE_FILES) {
+                errno = ENOSYS;
+            }
+
+            return NULL;
+        }
+    }
+
+    memset(dirp->dirent->d_name, 0, sizeof(dirp->dirent->d_name));
+
+    strncpy(
+        dirp->dirent->d_name,
+        dirp->data.cFileName,
+        sizeof(dirp->dirent->d_name) - 1);
+
+    return dirp->dirent;
+}
+
+int closedir(DIR *dirp)
+{
+    assert(dirp);
+
+    if(!FindClose(dirp->hFind)) {
+        errno = ENOSYS;
+        return -1;
+    }
+
+    if (dirp->dirent) {
+        free(dirp->dirent);
+    }
+    free(dirp);
+
+    return 0;
+}
+// minirent.h IMPLEMENTATION END ////////////////////////////////////////
+#endif // _WIN32
+
+Cstr_Array cstr_array_append(Cstr_Array cstrs, Cstr cstr)
+{
+    Cstr_Array result = {
+        .count = cstrs.count + 1
+    };
+    result.elems = malloc(sizeof(result.elems[0]) * result.count);
+    memcpy(result.elems, cstrs.elems, cstrs.count * sizeof(result.elems[0]));
+    result.elems[cstrs.count] = cstr;
+    return result;
+}
+
+int cstr_ends_with(Cstr cstr, Cstr postfix)
+{
+    const size_t cstr_len = strlen(cstr);
+    const size_t postfix_len = strlen(postfix);
+    return postfix_len <= cstr_len
+           && strcmp(cstr + cstr_len - postfix_len, postfix) == 0;
+}
+
+Cstr cstr_no_ext(Cstr path)
+{
+    size_t n = strlen(path);
+    while (n > 0 && path[n - 1] != '.') {
+        n -= 1;
+    }
+
+    if (n > 0) {
+        char *result = malloc(n);
+        memcpy(result, path, n);
+        result[n - 1] = '\0';
+
+        return result;
+    } else {
+        return path;
+    }
+}
+
+Cstr_Array cstr_array_make(Cstr first, ...)
+{
+    Cstr_Array result = {0};
+
+    if (first == NULL) {
+        return result;
+    }
+
+    result.count += 1;
+
+    va_list args;
+    va_start(args, first);
+    for (Cstr next = va_arg(args, Cstr);
+            next != NULL;
+            next = va_arg(args, Cstr)) {
+        result.count += 1;
+    }
+    va_end(args);
+
+    result.elems = malloc(sizeof(result.elems[0]) * result.count);
+    if (result.elems == NULL) {
+        PANIC("could not allocate memory: %s", strerror(errno));
+    }
+    result.count = 0;
+
+    result.elems[result.count++] = first;
+
+    va_start(args, first);
+    for (Cstr next = va_arg(args, Cstr);
+            next != NULL;
+            next = va_arg(args, Cstr)) {
+        result.elems[result.count++] = next;
+    }
+    va_end(args);
+
+    return result;
+}
+
+Cstr cstr_array_join(Cstr sep, Cstr_Array cstrs)
+{
+    if (cstrs.count == 0) {
+        return "";
+    }
+
+    const size_t sep_len = strlen(sep);
+    size_t len = 0;
+    for (size_t i = 0; i < cstrs.count; ++i) {
+        len += strlen(cstrs.elems[i]);
+    }
+
+    const size_t result_len = (cstrs.count - 1) * sep_len + len + 1;
+    char *result = malloc(sizeof(char) * result_len);
+    if (result == NULL) {
+        PANIC("could not allocate memory: %s", strerror(errno));
+    }
+
+    len = 0;
+    for (size_t i = 0; i < cstrs.count; ++i) {
+        if (i > 0) {
+            memcpy(result + len, sep, sep_len);
+            len += sep_len;
+        }
+
+        size_t elem_len = strlen(cstrs.elems[i]);
+        memcpy(result + len, cstrs.elems[i], elem_len);
+        len += elem_len;
+    }
+    result[len] = '\0';
+
+    return result;
+}
+
+Pipe pipe_make(void)
+{
+    Pipe pip = {0};
+
+#ifdef _WIN32
+    // https://docs.microsoft.com/en-us/windows/win32/ProcThread/creating-a-child-process-with-redirected-input-and-output
+
+    SECURITY_ATTRIBUTES saAttr = {0};
+    saAttr.nLength = sizeof(SECURITY_ATTRIBUTES);
+    saAttr.bInheritHandle = TRUE;
+
+    if (!CreatePipe(&pip.read, &pip.write, &saAttr, 0)) {
+        PANIC("Could not create pipe: %s", GetLastErrorAsString());
+    }
+#else
+    Fd pipefd[2];
+    if (pipe(pipefd) < 0) {
+        PANIC("Could not create pipe: %s", strerror(errno));
+    }
+
+    pip.read = pipefd[0];
+    pip.write = pipefd[1];
+#endif // _WIN32
+
+    return pip;
+}
+
+Fd fd_open_for_read(Cstr path)
+{
+#ifndef _WIN32
+    Fd result = open(path, O_RDONLY);
+    if (result < 0) {
+        PANIC("Could not open file %s: %s", path, strerror(errno));
+    }
+    return result;
+#else
+    // https://docs.microsoft.com/en-us/windows/win32/fileio/opening-a-file-for-reading-or-writing
+    SECURITY_ATTRIBUTES saAttr = {0};
+    saAttr.nLength = sizeof(SECURITY_ATTRIBUTES);
+    saAttr.bInheritHandle = TRUE;
+
+    Fd result = CreateFile(
+                    path,
+                    GENERIC_READ,
+                    0,
+                    &saAttr,
+                    OPEN_EXISTING,
+                    FILE_ATTRIBUTE_READONLY,
+                    NULL);
+
+    if (result == INVALID_HANDLE_VALUE) {
+        PANIC("Could not open file %s", path);
+    }
+
+    return result;
+#endif // _WIN32
+}
+
+Fd fd_open_for_write(Cstr path)
+{
+#ifndef _WIN32
+    Fd result = open(path,
+                     O_WRONLY | O_CREAT | O_TRUNC,
+                     S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH);
+    if (result < 0) {
+        PANIC("could not open file %s: %s", path, strerror(errno));
+    }
+    return result;
+#else
+    SECURITY_ATTRIBUTES saAttr = {0};
+    saAttr.nLength = sizeof(SECURITY_ATTRIBUTES);
+    saAttr.bInheritHandle = TRUE;
+
+    Fd result = CreateFile(
+                    path,                  // name of the write
+                    GENERIC_WRITE,         // open for writing
+                    0,                     // do not share
+                    &saAttr,               // default security
+                    CREATE_NEW,            // create new file only
+                    FILE_ATTRIBUTE_NORMAL, // normal file
+                    NULL                   // no attr. template
+                );
+
+    if (result == INVALID_HANDLE_VALUE) {
+        PANIC("Could not open file %s: %s", path, GetLastErrorAsString());
+    }
+
+    return result;
+#endif // _WIN32
+}
+
+void fd_close(Fd fd)
+{
+#ifdef _WIN32
+    CloseHandle(fd);
+#else
+    close(fd);
+#endif // _WIN32
+}
+
+void pid_wait(Pid pid)
+{
+#ifdef _WIN32
+    DWORD result = WaitForSingleObject(
+                       pid,     // HANDLE hHandle,
+                       INFINITE // DWORD  dwMilliseconds
+                   );
+
+    if (result == WAIT_FAILED) {
+        PANIC("could not wait on child process: %s", GetLastErrorAsString());
+    }
+
+    DWORD exit_status;
+    if (GetExitCodeProcess(pid, &exit_status) == 0) {
+        PANIC("could not get process exit code: %lu", GetLastError());
+    }
+
+    if (exit_status != 0) {
+        PANIC("command exited with exit code %lu", exit_status);
+    }
+
+    CloseHandle(pid);
+#else
+    for (;;) {
+        int wstatus = 0;
+        if (waitpid(pid, &wstatus, 0) < 0) {
+            PANIC("could not wait on command (pid %d): %s", pid, strerror(errno));
+        }
+
+        if (WIFEXITED(wstatus)) {
+            int exit_status = WEXITSTATUS(wstatus);
+            if (exit_status != 0) {
+                PANIC("command exited with exit code %d", exit_status);
+            }
+
+            break;
+        }
+
+        if (WIFSIGNALED(wstatus)) {
+            PANIC("command process was terminated by %s", strsignal(WTERMSIG(wstatus)));
+        }
+    }
+
+#endif // _WIN32
+}
+
+Cstr cmd_show(Cmd cmd)
+{
+    // TODO(#31): cmd_show does not render the command line properly
+    // - No string literals when arguments contains space
+    // - No escaping of special characters
+    // - Etc.
+    return cstr_array_join(" ", cmd.line);
+}
+
+Pid cmd_run_async(Cmd cmd, Fd *fdin, Fd *fdout)
+{
+#ifdef _WIN32
+    // https://docs.microsoft.com/en-us/windows/win32/procthread/creating-a-child-process-with-redirected-input-and-output
+
+    STARTUPINFO siStartInfo;
+    ZeroMemory(&siStartInfo, sizeof(siStartInfo));
+    siStartInfo.cb = sizeof(STARTUPINFO);
+    // NOTE: theoretically setting NULL to std handles should not be a problem
+    // https://docs.microsoft.com/en-us/windows/console/getstdhandle?redirectedfrom=MSDN#attachdetach-behavior
+    siStartInfo.hStdError = GetStdHandle(STD_ERROR_HANDLE);
+    // TODO(#32): check for errors in GetStdHandle
+    siStartInfo.hStdOutput = fdout ? *fdout : GetStdHandle(STD_OUTPUT_HANDLE);
+    siStartInfo.hStdInput = fdin ? *fdin : GetStdHandle(STD_INPUT_HANDLE);
+    siStartInfo.dwFlags |= STARTF_USESTDHANDLES;
+
+    PROCESS_INFORMATION piProcInfo;
+    ZeroMemory(&piProcInfo, sizeof(PROCESS_INFORMATION));
+
+    BOOL bSuccess =
+        CreateProcess(
+            NULL,
+            // TODO(#33): cmd_run_async on Windows does not render command line properly
+            // It may require wrapping some arguments with double-quotes if they contains spaces, etc.
+            cstr_array_join(" ", cmd.line),
+            NULL,
+            NULL,
+            TRUE,
+            0,
+            NULL,
+            NULL,
+            &siStartInfo,
+            &piProcInfo
+        );
+
+    if (!bSuccess) {
+        PANIC("Could not create child process %s: %s\n",
+              cmd_show(cmd), GetLastErrorAsString());
+    }
+
+    CloseHandle(piProcInfo.hThread);
+
+    return piProcInfo.hProcess;
+#else
+    pid_t cpid = fork();
+    if (cpid < 0) {
+        PANIC("Could not fork child process: %s: %s",
+              cmd_show(cmd), strerror(errno));
+    }
+
+    if (cpid == 0) {
+        Cstr_Array args = cstr_array_append(cmd.line, NULL);
+
+        if (fdin) {
+            if (dup2(*fdin, STDIN_FILENO) < 0) {
+                PANIC("Could not setup stdin for child process: %s", strerror(errno));
+            }
+        }
+
+        if (fdout) {
+            if (dup2(*fdout, STDOUT_FILENO) < 0) {
+                PANIC("Could not setup stdout for child process: %s", strerror(errno));
+            }
+        }
+
+        if (execvp(args.elems[0], (char * const*) args.elems) < 0) {
+            PANIC("Could not exec child process: %s: %s",
+                  cmd_show(cmd), strerror(errno));
+        }
+    }
+
+    return cpid;
+#endif // _WIN32
+}
+
+void cmd_run_sync(Cmd cmd)
+{
+    pid_wait(cmd_run_async(cmd, NULL, NULL));
+}
+
+static void chain_set_input_output_files_or_count_cmds(Chain *chain, Chain_Token token)
+{
+    switch (token.type) {
+    case CHAIN_TOKEN_CMD: {
+        chain->cmds.count += 1;
+    }
+    break;
+
+    case CHAIN_TOKEN_IN: {
+        if (chain->input_filepath) {
+            PANIC("Input file path was already set");
+        }
+
+        chain->input_filepath = token.args.elems[0];
+    }
+    break;
+
+    case CHAIN_TOKEN_OUT: {
+        if (chain->output_filepath) {
+            PANIC("Output file path was already set");
+        }
+
+        chain->output_filepath = token.args.elems[0];
+    }
+    break;
+
+    case CHAIN_TOKEN_END:
+    default: {
+        assert(0 && "unreachable");
+        exit(1);
+    }
+    }
+}
+
+static void chain_push_cmd(Chain *chain, Chain_Token token)
+{
+    if (token.type == CHAIN_TOKEN_CMD) {
+        chain->cmds.elems[chain->cmds.count++] = (Cmd) {
+            .line = token.args
+        };
+    }
+}
+
+Chain chain_build_from_tokens(Chain_Token first, ...)
+{
+    Chain result = {0};
+
+    chain_set_input_output_files_or_count_cmds(&result, first);
+    va_list args;
+    va_start(args, first);
+    Chain_Token next = va_arg(args, Chain_Token);
+    while (next.type != CHAIN_TOKEN_END) {
+        chain_set_input_output_files_or_count_cmds(&result, next);
+        next = va_arg(args, Chain_Token);
+    }
+    va_end(args);
+
+    result.cmds.elems = malloc(sizeof(result.cmds.elems[0]) * result.cmds.count);
+    if (result.cmds.elems == NULL) {
+        PANIC("could not allocate memory: %s", strerror(errno));
+    }
+    result.cmds.count = 0;
+
+    chain_push_cmd(&result, first);
+
+    va_start(args, first);
+    next = va_arg(args, Chain_Token);
+    while (next.type != CHAIN_TOKEN_END) {
+        chain_push_cmd(&result, next);
+        next = va_arg(args, Chain_Token);
+    }
+    va_end(args);
+
+    return result;
+}
+
+void chain_run_sync(Chain chain)
+{
+    if (chain.cmds.count == 0) {
+        return;
+    }
+
+    Pid *cpids = malloc(sizeof(Pid) * chain.cmds.count);
+
+    Pipe pip = {0};
+    Fd fdin = 0;
+    Fd *fdprev = NULL;
+
+    if (chain.input_filepath) {
+        fdin = fd_open_for_read(chain.input_filepath);
+        if (fdin < 0) {
+            PANIC("could not open file %s: %s", chain.input_filepath, strerror(errno));
+        }
+        fdprev = &fdin;
+    }
+
+    for (size_t i = 0; i < chain.cmds.count - 1; ++i) {
+        pip = pipe_make();
+
+        cpids[i] = cmd_run_async(
+                       chain.cmds.elems[i],
+                       fdprev,
+                       &pip.write);
+
+        if (fdprev) fd_close(*fdprev);
+        fd_close(pip.write);
+        fdprev = &fdin;
+        fdin = pip.read;
+    }
+
+    {
+        Fd fdout = 0;
+        Fd *fdnext = NULL;
+
+        if (chain.output_filepath) {
+            fdout = fd_open_for_write(chain.output_filepath);
+            if (fdout < 0) {
+                PANIC("could not open file %s: %s",
+                      chain.output_filepath,
+                      strerror(errno));
+            }
+            fdnext = &fdout;
+        }
+
+        const size_t last = chain.cmds.count - 1;
+        cpids[last] =
+            cmd_run_async(
+                chain.cmds.elems[last],
+                fdprev,
+                fdnext);
+
+        if (fdprev) fd_close(*fdprev);
+        if (fdnext) fd_close(*fdnext);
+    }
+
+    for (size_t i = 0; i < chain.cmds.count; ++i) {
+        pid_wait(cpids[i]);
+    }
+}
+
+void chain_echo(Chain chain)
+{
+    printf("[INFO] CHAIN:");
+    if (chain.input_filepath) {
+        printf(" %s", chain.input_filepath);
+    }
+
+    FOREACH_ARRAY(Cmd, cmd, chain.cmds, {
+        printf(" |> %s", cmd_show(*cmd));
+    });
+
+    if (chain.output_filepath) {
+        printf(" |> %s", chain.output_filepath);
+    }
+
+    printf("\n");
+}
+
+int path_exists(Cstr path)
+{
+#ifdef _WIN32
+    DWORD dwAttrib = GetFileAttributes(path);
+    return (dwAttrib != INVALID_FILE_ATTRIBUTES);
+#else
+    struct stat statbuf = {0};
+    if (stat(path, &statbuf) < 0) {
+        if (errno == ENOENT) {
+            errno = 0;
+            return 0;
+        }
+
+        PANIC("could not retrieve information about file %s: %s",
+              path, strerror(errno));
+    }
+
+    return 1;
+#endif
+}
+
+int path_is_dir(Cstr path)
+{
+#ifdef _WIN32
+    DWORD dwAttrib = GetFileAttributes(path);
+
+    return (dwAttrib != INVALID_FILE_ATTRIBUTES &&
+            (dwAttrib & FILE_ATTRIBUTE_DIRECTORY));
+#else
+    struct stat statbuf = {0};
+    if (stat(path, &statbuf) < 0) {
+        if (errno == ENOENT) {
+            errno = 0;
+            return 0;
+        }
+
+        PANIC("could not retrieve information about file %s: %s",
+              path, strerror(errno));
+    }
+
+    return S_ISDIR(statbuf.st_mode);
+#endif // _WIN32
+}
+
+void path_rename(const char *old_path, const char *new_path)
+{
+#ifdef _WIN32
+    if (!MoveFileEx(old_path, new_path, MOVEFILE_REPLACE_EXISTING)) {
+        PANIC("could not rename %s to %s: %s", old_path, new_path,
+              GetLastErrorAsString());
+    }
+#else
+    if (rename(old_path, new_path) < 0) {
+        PANIC("could not rename %s to %s: %s", old_path, new_path,
+              strerror(errno));
+    }
+#endif // _WIN32
+}
+
+void path_mkdirs(Cstr_Array path)
+{
+    if (path.count == 0) {
+        return;
+    }
+
+    size_t len = 0;
+    for (size_t i = 0; i < path.count; ++i) {
+        len += strlen(path.elems[i]);
+    }
+
+    size_t seps_count = path.count - 1;
+    const size_t sep_len = strlen(PATH_SEP);
+
+    char *result = malloc(len + seps_count * sep_len + 1);
+
+    len = 0;
+    for (size_t i = 0; i < path.count; ++i) {
+        size_t n = strlen(path.elems[i]);
+        memcpy(result + len, path.elems[i], n);
+        len += n;
+
+        if (seps_count > 0) {
+            memcpy(result + len, PATH_SEP, sep_len);
+            len += sep_len;
+            seps_count -= 1;
+        }
+
+        result[len] = '\0';
+
+        if (mkdir(result, 0755) < 0) {
+            if (errno == EEXIST) {
+                errno = 0;
+                WARN("directory %s already exists", result);
+            } else {
+                PANIC("could not create directory %s: %s", result, strerror(errno));
+            }
+        }
+    }
+}
+
+void path_rm(Cstr path)
+{
+    if (IS_DIR(path)) {
+        FOREACH_FILE_IN_DIR(file, path, {
+            if (strcmp(file, ".") != 0 && strcmp(file, "..") != 0)
+            {
+                path_rm(PATH(path, file));
+            }
+        });
+
+        if (rmdir(path) < 0) {
+            if (errno == ENOENT) {
+                errno = 0;
+                WARN("directory %s does not exist", path);
+            } else {
+                PANIC("could not remove directory %s: %s", path, strerror(errno));
+            }
+        }
+    } else {
+        if (unlink(path) < 0) {
+            if (errno == ENOENT) {
+                errno = 0;
+                WARN("file %s does not exist", path);
+            } else {
+                PANIC("could not remove file %s: %s", path, strerror(errno));
+            }
+        }
+    }
+}
+
+int is_path1_modified_after_path2(const char *path1, const char *path2)
+{
+#ifdef _WIN32
+    FILETIME path1_time, path2_time;
+
+    Fd path1_fd = fd_open_for_read(path1);
+    if (!GetFileTime(path1_fd, NULL, NULL, &path1_time)) {
+        PANIC("could not get time of %s: %s", path1, GetLastErrorAsString());
+    }
+    fd_close(path1_fd);
+
+    Fd path2_fd = fd_open_for_read(path2);
+    if (!GetFileTime(path2_fd, NULL, NULL, &path2_time)) {
+        PANIC("could not get time of %s: %s", path2, GetLastErrorAsString());
+    }
+    fd_close(path2_fd);
+
+    return CompareFileTime(&path1_time, &path2_time) == 1;
+#else
+    struct stat statbuf = {0};
+
+    if (stat(path1, &statbuf) < 0) {
+        PANIC("could not stat %s: %s\n", path1, strerror(errno));
+    }
+    int path1_time = statbuf.st_mtime;
+
+    if (stat(path2, &statbuf) < 0) {
+        PANIC("could not stat %s: %s\n", path2, strerror(errno));
+    }
+    int path2_time = statbuf.st_mtime;
+
+    return path1_time > path2_time;
+#endif
+}
+
+void VLOG(FILE *stream, Cstr tag, Cstr fmt, va_list args)
+{
+    fprintf(stream, "[%s] ", tag);
+    vfprintf(stream, fmt, args);
+    fprintf(stream, "\n");
+}
+
+void INFO(Cstr fmt, ...)
+{
+    va_list args;
+    va_start(args, fmt);
+    VLOG(stderr, "INFO", fmt, args);
+    va_end(args);
+}
+
+void WARN(Cstr fmt, ...)
+{
+    va_list args;
+    va_start(args, fmt);
+    VLOG(stderr, "WARN", fmt, args);
+    va_end(args);
+}
+
+void ERRO(Cstr fmt, ...)
+{
+    va_list args;
+    va_start(args, fmt);
+    VLOG(stderr, "ERRO", fmt, args);
+    va_end(args);
+}
+
+void PANIC(Cstr fmt, ...)
+{
+    va_list args;
+    va_start(args, fmt);
+    VLOG(stderr, "ERRO", fmt, args);
+    va_end(args);
+    exit(1);
+}
+
+char *shift_args(int *argc, char ***argv)
+{
+    assert(*argc > 0);
+    char *result = **argv;
+    *argc -= 1;
+    *argv += 1;
+    return result;
+}
+
+#endif // NOBUILD_IMPLEMENTATION

olive.c

@@ -1,3 +1,24 @@
+// Copyright 2022 Alexey Kutepov <[email protected]>
+//
+// Permission is hereby granted, free of charge, to any person obtaining
+// a copy of this software and associated documentation files (the
+// "Software"), to deal in the Software without restriction, including
+// without limitation the rights to use, copy, modify, merge, publish,
+// distribute, sublicense, and/or sell copies of the Software, and to
+// permit persons to whom the Software is furnished to do so, subject to
+// the following conditions:
+//
+// The above copyright notice and this permission notice shall be
+// included in all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
 #ifndef OLIVE_C_
 #define OLIVE_C_
 
@@ -22,10 +43,10 @@ typedef struct {
     const char *glyphs;
 } Olivec_Font;
 
-#define DEFAULT_FONT_HEIGHT 6
-#define DEFAULT_FONT_WIDTH 6
+#define OLIVEC_DEFAULT_FONT_HEIGHT 6
+#define OLIVEC_DEFAULT_FONT_WIDTH 6
 // TODO: allocate proper descender and acender areas for the default font
-static char default_font_glyphs[128][DEFAULT_FONT_HEIGHT][DEFAULT_FONT_WIDTH] = {
+static char olivec_default_glyphs[128][OLIVEC_DEFAULT_FONT_HEIGHT][OLIVEC_DEFAULT_FONT_WIDTH] = {
     ['a'] = {
         {0, 0, 0, 0, 0},
         {0, 1, 1, 0, 0},
@@ -371,12 +392,16 @@ static char default_font_glyphs[128][DEFAULT_FONT_HEIGHT][DEFAULT_FONT_WIDTH] =
     },
 };
 
-static Olivec_Font default_font = {
-    .glyphs = &default_font_glyphs[0][0][0],
-    .width = DEFAULT_FONT_WIDTH,
-    .height = DEFAULT_FONT_HEIGHT,
+static Olivec_Font olivec_default_font = {
+    .glyphs = &olivec_default_glyphs[0][0][0],
+    .width = OLIVEC_DEFAULT_FONT_WIDTH,
+    .height = OLIVEC_DEFAULT_FONT_HEIGHT,
 };
 
+// WARNING! Always initialize your Canvas with a color that has Non-Zero Alpha Channel!
+// A lot of functions use `olivec_blend_color()` function to blend with the Background
+// which preserves the original Alpha of the Background. So you may easily end up with
+// a result that is perceptually transparent if the Alpha is Zero.
 typedef struct {
     uint32_t *pixels;
     size_t width;
@@ -389,29 +414,53 @@ typedef struct {
 
 OLIVECDEF Olivec_Canvas olivec_canvas(uint32_t *pixels, size_t width, size_t height, size_t stride);
 OLIVECDEF Olivec_Canvas olivec_subcanvas(Olivec_Canvas oc, int x, int y, int w, int h);
+OLIVECDEF bool olivec_in_bounds(Olivec_Canvas oc, int x, int y);
 OLIVECDEF void olivec_blend_color(uint32_t *c1, uint32_t c2);
 OLIVECDEF void olivec_fill(Olivec_Canvas oc, uint32_t color);
 OLIVECDEF void olivec_rect(Olivec_Canvas oc, int x, int y, int w, int h, uint32_t color);
 OLIVECDEF void olivec_frame(Olivec_Canvas oc, int x, int y, int w, int h, size_t thiccness, uint32_t color);
 OLIVECDEF void olivec_circle(Olivec_Canvas oc, int cx, int cy, int r, uint32_t color);
+OLIVECDEF void olivec_ellipse(Olivec_Canvas oc, int cx, int cy, int rx, int ry, uint32_t color);
 // TODO: lines with different thiccness
 OLIVECDEF void olivec_line(Olivec_Canvas oc, int x1, int y1, int x2, int y2, uint32_t color);
+OLIVECDEF bool olivec_normalize_triangle(size_t width, size_t height, int x1, int y1, int x2, int y2, int x3, int y3, int *lx, int *hx, int *ly, int *hy);
+OLIVECDEF bool olivec_barycentric(int x1, int y1, int x2, int y2, int x3, int y3, int xp, int yp, int *u1, int *u2, int *det);
 OLIVECDEF void olivec_triangle(Olivec_Canvas oc, int x1, int y1, int x2, int y2, int x3, int y3, uint32_t color);
-OLIVECDEF void olivec_triangle3(Olivec_Canvas oc, int x1, int y1, int x2, int y2, int x3, int y3, uint32_t c1, uint32_t c2, uint32_t c3);
+OLIVECDEF void olivec_triangle3c(Olivec_Canvas oc, int x1, int y1, int x2, int y2, int x3, int y3, uint32_t c1, uint32_t c2, uint32_t c3);
+OLIVECDEF void olivec_triangle3z(Olivec_Canvas oc, int x1, int y1, int x2, int y2, int x3, int y3, float z1, float z2, float z3);
+OLIVECDEF void olivec_triangle3uv(Olivec_Canvas oc, int x1, int y1, int x2, int y2, int x3, int y3, float tx1, float ty1, float tx2, float ty2, float tx3, float ty3, float z1, float z2, float z3, Olivec_Canvas texture);
+OLIVECDEF void olivec_triangle3uv_bilinear(Olivec_Canvas oc, int x1, int y1, int x2, int y2, int x3, int y3, float tx1, float ty1, float tx2, float ty2, float tx3, float ty3, float z1, float z2, float z3, Olivec_Canvas texture);
 OLIVECDEF void olivec_text(Olivec_Canvas oc, const char *text, int x, int y, Olivec_Font font, size_t size, uint32_t color);
+OLIVECDEF void olivec_sprite_blend(Olivec_Canvas oc, int x, int y, int w, int h, Olivec_Canvas sprite);
+OLIVECDEF void olivec_sprite_copy(Olivec_Canvas oc, int x, int y, int w, int h, Olivec_Canvas sprite);
+OLIVECDEF void olivec_sprite_copy_bilinear(Olivec_Canvas oc, int x, int y, int w, int h, Olivec_Canvas sprite);
+OLIVECDEF uint32_t olivec_pixel_bilinear(Olivec_Canvas sprite, int nx, int ny, int w, int h);
+
+typedef struct {
+    // Safe ranges to iterate over.
+    int x1, x2;
+    int y1, y2;
+
+    // Original uncut ranges some parts of which may be outside of the canvas boundaries.
+    int ox1, ox2;
+    int oy1, oy2;
+} Olivec_Normalized_Rect;
 
 // The point of this function is to produce two ranges x1..x2 and y1..y2 that are guaranteed to be safe to iterate over the canvas of size pixels_width by pixels_height without any boundary checks.
 //
-// if (olivec_normalize_rect(x, y, w, h, WIDTH, HEIGHT, &x1, &y1, &x2, &y2)) {
-//     for (int x = x1; x <= x2; ++x) {
-//         for (int y = y1; y <= y2; ++y) {
+// Olivec_Normalized_Rect nr = {0};
+// if (olivec_normalize_rect(x, y, w, h, WIDTH, HEIGHT, &nr)) {
+//     for (int x = nr.x1; x <= nr.x2; ++x) {
+//         for (int y = nr.y1; y <= nr.y2; ++y) {
 //             OLIVEC_PIXEL(oc, x, y) = 0x69696969;
 //         }
 //     }
 // } else {
 //     // Rectangle is invisible cause it's completely out-of-bounds
 // }
-OLIVECDEF bool olivec_normalize_rect(int x, int y, int w, int h, size_t pixels_width, size_t pixels_height, int *x1, int *x2, int *y1, int *y2);
+OLIVECDEF bool olivec_normalize_rect(int x, int y, int w, int h,
+                                     size_t canvas_width, size_t canvas_height,
+                                     Olivec_Normalized_Rect *nr);
 
 #endif // OLIVE_C_
 
@@ -429,40 +478,49 @@ OLIVECDEF Olivec_Canvas olivec_canvas(uint32_t *pixels, size_t width, size_t hei
 }
 
 OLIVECDEF bool olivec_normalize_rect(int x, int y, int w, int h,
-                                     size_t pixels_width, size_t pixels_height,
-                                     int *x1, int *x2, int *y1, int *y2)
+                                     size_t canvas_width, size_t canvas_height,
+                                     Olivec_Normalized_Rect *nr)
 {
-    *x1 = x;
-    *y1 = y;
+    // No need to render empty rectangle
+    if (w == 0) return false;
+    if (h == 0) return false;
+
+    nr->ox1 = x;
+    nr->oy1 = y;
 
     // Convert the rectangle to 2-points representation
-    *x2 = *x1 + OLIVEC_SIGN(int, w)*(OLIVEC_ABS(int, w) - 1);
-    if (*x1 > *x2) OLIVEC_SWAP(int, *x1, *x2);
-    *y2 = *y1 + OLIVEC_SIGN(int, h)*(OLIVEC_ABS(int, h) - 1);
-    if (*y1 > *y2) OLIVEC_SWAP(int, *y1, *y2);
+    nr->ox2 = nr->ox1 + OLIVEC_SIGN(int, w)*(OLIVEC_ABS(int, w) - 1);
+    if (nr->ox1 > nr->ox2) OLIVEC_SWAP(int, nr->ox1, nr->ox2);
+    nr->oy2 = nr->oy1 + OLIVEC_SIGN(int, h)*(OLIVEC_ABS(int, h) - 1);
+    if (nr->oy1 > nr->oy2) OLIVEC_SWAP(int, nr->oy1, nr->oy2);
 
     // Cull out invisible rectangle
-    if (*x1 >= (int) pixels_width) return false;
-    if (*x2 < 0) return false;
-    if (*y1 >= (int) pixels_height) return false;
-    if (*y2 < 0) return false;
+    if (nr->ox1 >= (int) canvas_width) return false;
+    if (nr->ox2 < 0) return false;
+    if (nr->oy1 >= (int) canvas_height) return false;
+    if (nr->oy2 < 0) return false;
+
+    nr->x1 = nr->ox1;
+    nr->y1 = nr->oy1;
+    nr->x2 = nr->ox2;
+    nr->y2 = nr->oy2;
 
     // Clamp the rectangle to the boundaries
-    if (*x1 < 0) *x1 = 0;
-    if (*x2 >= (int) pixels_width) *x2 = (int) pixels_width - 1;
-    if (*y1 < 0) *y1 = 0;
-    if (*y2 >= (int) pixels_height) *y2 = (int) pixels_height - 1;
+    if (nr->x1 < 0) nr->x1 = 0;
+    if (nr->x2 >= (int) canvas_width) nr->x2 = (int) canvas_width - 1;
+    if (nr->y1 < 0) nr->y1 = 0;
+    if (nr->y2 >= (int) canvas_height) nr->y2 = (int) canvas_height - 1;
 
     return true;
 }
 
 OLIVECDEF Olivec_Canvas olivec_subcanvas(Olivec_Canvas oc, int x, int y, int w, int h)
 {
-    int x1, x2, y1, y2;
-    if (!olivec_normalize_rect(x, y, w, h, oc.width, oc.height, &x1, &x2, &y1, &y2)) return OLIVEC_CANVAS_NULL;
-    oc.pixels = &OLIVEC_PIXEL(oc, x1, y1);
-    oc.width = x2 - x1 + 1;
-    oc.height = y2 - y1 + 1;
+    Olivec_Normalized_Rect nr = {0};
+    if (!olivec_normalize_rect(x, y, w, h, oc.width, oc.height, &nr)) return OLIVEC_CANVAS_NULL;
+    oc.pixels = &OLIVEC_PIXEL(oc, nr.x1, nr.y1);
+    oc.width = nr.x2 - nr.x1 + 1;
+    oc.height = nr.y2 - nr.y1 + 1;
     return oc;
 }
 
@@ -504,10 +562,10 @@ OLIVECDEF void olivec_fill(Olivec_Canvas oc, uint32_t color)
 
 OLIVECDEF void olivec_rect(Olivec_Canvas oc, int x, int y, int w, int h, uint32_t color)
 {
-    int x1, x2, y1, y2;
-    if (!olivec_normalize_rect(x, y, w, h, oc.width, oc.height, &x1, &x2, &y1, &y2)) return;
-    for (int x = x1; x <= x2; ++x) {
-        for (int y = y1; y <= y2; ++y) {
+    Olivec_Normalized_Rect nr = {0};
+    if (!olivec_normalize_rect(x, y, w, h, oc.width, oc.height, &nr)) return;
+    for (int x = nr.x1; x <= nr.x2; ++x) {
+        for (int y = nr.y1; y <= nr.y2; ++y) {
             olivec_blend_color(&OLIVEC_PIXEL(oc, x, y), color);
         }
     }
@@ -531,14 +589,34 @@ OLIVECDEF void olivec_frame(Olivec_Canvas oc, int x, int y, int w, int h, size_t
     olivec_rect(oc, x2 + t/2, y1 - t/2, -t, (y2 - y1 + 1) + t/2*2, color); // Right
 }
 
+OLIVECDEF void olivec_ellipse(Olivec_Canvas oc, int cx, int cy, int rx, int ry, uint32_t color)
+{
+    Olivec_Normalized_Rect nr = {0};
+    int rx1 = rx + OLIVEC_SIGN(int, rx);
+    int ry1 = ry + OLIVEC_SIGN(int, ry);
+    if (!olivec_normalize_rect(cx - rx1, cy - ry1, 2*rx1, 2*ry1, oc.width, oc.height, &nr)) return;
+
+    for (int y = nr.y1; y <= nr.y2; ++y) {
+        for (int x = nr.x1; x <= nr.x2; ++x) {
+            float nx = (x + 0.5 - nr.x1)/(2.0f*rx1);
+            float ny = (y + 0.5 - nr.y1)/(2.0f*ry1);
+            float dx = nx - 0.5;
+            float dy = ny - 0.5;
+            if (dx*dx + dy*dy <= 0.5*0.5) {
+                OLIVEC_PIXEL(oc, x, y) = color;
+            }
+        }
+    }
+}
+
 OLIVECDEF void olivec_circle(Olivec_Canvas oc, int cx, int cy, int r, uint32_t color)
 {
-    int x1, y1, x2, y2;
+    Olivec_Normalized_Rect nr = {0};
     int r1 = r + OLIVEC_SIGN(int, r);
-    if (!olivec_normalize_rect(cx - r1, cy - r1, 2*r1, 2*r1, oc.width, oc.height, &x1, &x2, &y1, &y2)) return;
+    if (!olivec_normalize_rect(cx - r1, cy - r1, 2*r1, 2*r1, oc.width, oc.height, &nr)) return;
 
-    for (int y = y1; y <= y2; ++y) {
-        for (int x = x1; x <= x2; ++x) {
+    for (int y = nr.y1; y <= nr.y2; ++y) {
+        for (int x = nr.x1; x <= nr.x2; ++x) {
             int count = 0;
             for (int sox = 0; sox < OLIVEC_AA_RES; ++sox) {
                 for (int soy = 0; soy < OLIVEC_AA_RES; ++soy) {
@@ -557,6 +635,11 @@ OLIVECDEF void olivec_circle(Olivec_Canvas oc, int cx, int cy, int r, uint32_t c
     }
 }
 
+OLIVECDEF bool olivec_in_bounds(Olivec_Canvas oc, int x, int y)
+{
+    return 0 <= x && x < (int) oc.width && 0 <= y && y < (int) oc.height;
+}
+
 // TODO: AA for line
 OLIVECDEF void olivec_line(Olivec_Canvas oc, int x1, int y1, int x2, int y2, uint32_t color)
 {
@@ -565,7 +648,7 @@ OLIVECDEF void olivec_line(Olivec_Canvas oc, int x1, int y1, int x2, int y2, uin
 
     // If both of the differences are 0 there will be a division by 0 below.
     if (dx == 0 && dy == 0) {
-        if (0 <= x1 && x1 < (int) oc.width && 0 <= y1 && y1 < (int) oc.height) {
+        if (olivec_in_bounds(oc, x1, y1)) {
             olivec_blend_color(&OLIVEC_PIXEL(oc, x1, y1), color);
         }
         return;
@@ -577,18 +660,10 @@ OLIVECDEF void olivec_line(Olivec_Canvas oc, int x1, int y1, int x2, int y2, uin
             OLIVEC_SWAP(int, y1, y2);
         }
 
-        // Cull out invisible line
-        if (x1 > (int) oc.width) return;
-        if (x2 < 0) return;
-
-        // Clamp the line to the boundaries
-        if (x1 < 0) x1 = 0;
-        if (x2 >= (int) oc.width) x2 = (int) oc.width - 1;
-
         for (int x = x1; x <= x2; ++x) {
             int y = dy*(x - x1)/dx + y1;
             // TODO: move boundary checks out side of the loops in olivec_draw_line
-            if (0 <= y && y < (int) oc.height) {
+            if (olivec_in_bounds(oc, x, y)) {
                 olivec_blend_color(&OLIVEC_PIXEL(oc, x, y), color);
             }
         }
@@ -598,25 +673,43 @@ OLIVECDEF void olivec_line(Olivec_Canvas oc, int x1, int y1, int x2, int y2, uin
             OLIVEC_SWAP(int, y1, y2);
         }
 
-        // Cull out invisible line
-        if (y1 > (int) oc.height) return;
-        if (y2 < 0) return;
-
-        // Clamp the line to the boundaries
-        if (y1 < 0) y1 = 0;
-        if (y2 >= (int) oc.height) y2 = (int) oc.height - 1;
-
         for (int y = y1; y <= y2; ++y) {
             int x = dx*(y - y1)/dy + x1;
             // TODO: move boundary checks out side of the loops in olivec_draw_line
-            if (0 <= x && x < (int) oc.width) {
+            if (olivec_in_bounds(oc, x, y)) {
                 olivec_blend_color(&OLIVEC_PIXEL(oc, x, y), color);
             }
         }
     }
 }
 
-OLIVECDEF uint32_t mix_colors3(uint32_t c1, uint32_t c2, uint32_t c3, int t1, int t2, int t3, int den)
+OLIVECDEF uint32_t mix_colors2(uint32_t c1, uint32_t c2, int u1, int det)
+{
+    // TODO: estimate how much overflows are an issue in integer only environment
+    int64_t r1 = OLIVEC_RED(c1);
+    int64_t g1 = OLIVEC_GREEN(c1);
+    int64_t b1 = OLIVEC_BLUE(c1);
+    int64_t a1 = OLIVEC_ALPHA(c1);
+
+    int64_t r2 = OLIVEC_RED(c2);
+    int64_t g2 = OLIVEC_GREEN(c2);
+    int64_t b2 = OLIVEC_BLUE(c2);
+    int64_t a2 = OLIVEC_ALPHA(c2);
+
+    if (det != 0) {
+        int u2 = det - u1;
+        int64_t r4 = (r1*u2 + r2*u1)/det;
+        int64_t g4 = (g1*u2 + g2*u1)/det;
+        int64_t b4 = (b1*u2 + b2*u1)/det;
+        int64_t a4 = (a1*u2 + a2*u1)/det;
+
+        return OLIVEC_RGBA(r4, g4, b4, a4);
+    }
+
+    return 0;
+}
+
+OLIVECDEF uint32_t mix_colors3(uint32_t c1, uint32_t c2, uint32_t c3, int u1, int u2, int det)
 {
     // TODO: estimate how much overflows are an issue in integer only environment
     int64_t r1 = OLIVEC_RED(c1);
@@ -634,11 +727,12 @@ OLIVECDEF uint32_t mix_colors3(uint32_t c1, uint32_t c2, uint32_t c3, int t1, in
     int64_t b3 = OLIVEC_BLUE(c3);
     int64_t a3 = OLIVEC_ALPHA(c3);
 
-    if (den != 0) {
-        int64_t r4 = (r1*t1 + r2*t2 + r3*t3)/den;
-        int64_t g4 = (g1*t1 + g2*t2 + g3*t3)/den;
-        int64_t b4 = (b1*t1 + b2*t2 + b3*t3)/den;
-        int64_t a4 = (a1*t1 + a2*t2 + a3*t3)/den;
+    if (det != 0) {
+        int u3 = det - u1 - u2;
+        int64_t r4 = (r1*u1 + r2*u2 + r3*u3)/det;
+        int64_t g4 = (g1*u1 + g2*u2 + g3*u3)/det;
+        int64_t b4 = (b1*u1 + b2*u2 + b3*u3)/det;
+        int64_t a4 = (a1*u1 + a2*u2 + a3*u3)/det;
 
         return OLIVEC_RGBA(r4, g4, b4, a4);
     }
@@ -646,130 +740,147 @@ OLIVECDEF uint32_t mix_colors3(uint32_t c1, uint32_t c2, uint32_t c3, int t1, in
     return 0;
 }
 
-OLIVECDEF void barycentric(int x1, int y1, int x2, int y2, int x3, int y3,
-                           int xp, int yp,
-                           int *u1, int *u2, int *det)
+// NOTE: we imply u3 = det - u1 - u2
+OLIVECDEF bool olivec_barycentric(int x1, int y1, int x2, int y2, int x3, int y3, int xp, int yp, int *u1, int *u2, int *det)
 {
     *det = ((x1 - x3)*(y2 - y3) - (x2 - x3)*(y1 - y3));
     *u1  = ((y2 - y3)*(xp - x3) + (x3 - x2)*(yp - y3));
     *u2  = ((y3 - y1)*(xp - x3) + (x1 - x3)*(yp - y3));
-    // u3 = det - u1 - u2
+    int u3 = *det - *u1 - *u2;
+    return (
+               (OLIVEC_SIGN(int, *u1) == OLIVEC_SIGN(int, *det) || *u1 == 0) &&
+               (OLIVEC_SIGN(int, *u2) == OLIVEC_SIGN(int, *det) || *u2 == 0) &&
+               (OLIVEC_SIGN(int, u3) == OLIVEC_SIGN(int, *det) || u3 == 0)
+           );
 }
 
-OLIVECDEF void olivec_triangle3(Olivec_Canvas oc, int x1, int y1, int x2, int y2, int x3, int y3,
-                                uint32_t c1, uint32_t c2, uint32_t c3)
+OLIVECDEF bool olivec_normalize_triangle(size_t width, size_t height, int x1, int y1, int x2, int y2, int x3, int y3, int *lx, int *hx, int *ly, int *hy)
 {
-    if (y1 > y2) {
-        OLIVEC_SWAP(int, x1, x2);
-        OLIVEC_SWAP(int, y1, y2);
-        OLIVEC_SWAP(int, c1, c2);
-    }
+    *lx = x1;
+    *hx = x1;
+    if (*lx > x2) *lx = x2;
+    if (*lx > x3) *lx = x3;
+    if (*hx < x2) *hx = x2;
+    if (*hx < x3) *hx = x3;
+    if (*lx < 0) *lx = 0;
+    if ((size_t) *lx >= width) return false;;
+    if (*hx < 0) return false;;
+    if ((size_t) *hx >= width) *hx = width-1;
+
+    *ly = y1;
+    *hy = y1;
+    if (*ly > y2) *ly = y2;
+    if (*ly > y3) *ly = y3;
+    if (*hy < y2) *hy = y2;
+    if (*hy < y3) *hy = y3;
+    if (*ly < 0) *ly = 0;
+    if ((size_t) *ly >= height) return false;;
+    if (*hy < 0) return false;;
+    if ((size_t) *hy >= height) *hy = height-1;
 
-    if (y2 > y3) {
-        OLIVEC_SWAP(int, x2, x3);
-        OLIVEC_SWAP(int, y2, y3);
-        OLIVEC_SWAP(int, c2, c3);
-    }
-
-    if (y1 > y2) {
-        OLIVEC_SWAP(int, x1, x2);
-        OLIVEC_SWAP(int, y1, y2);
-        OLIVEC_SWAP(int, c1, c2);
-    }
+    return true;
+}
 
-    int dx12 = x2 - x1;
-    int dy12 = y2 - y1;
-    int dx13 = x3 - x1;
-    int dy13 = y3 - y1;
-
-    for (int y = y1; y <= y2; ++y) {
-        // TODO: move boundary checks outside of loops in olivec_fill_triangle
-        if (0 <= y && (size_t) y < oc.height) {
-            int s1 = dy12 != 0 ? (y - y1)*dx12/dy12 + x1 : x1;
-            int s2 = dy13 != 0 ? (y - y1)*dx13/dy13 + x1 : x1;
-            if (s1 > s2) OLIVEC_SWAP(int, s1, s2);
-            for (int x = s1; x <= s2; ++x) {
-                if (0 <= x && (size_t) x < oc.width) {
-                    int u1, u2, det;
-                    barycentric(x1, y1, x2, y2, x3, y3, x, y, &u1, &u2, &det);
-                    uint32_t color = mix_colors3(c1, c2, c3, u1, u2, det - u1 - u2, det);
-                    olivec_blend_color(&OLIVEC_PIXEL(oc, x, y), color);
+OLIVECDEF void olivec_triangle3c(Olivec_Canvas oc, int x1, int y1, int x2, int y2, int x3, int y3,
+                                 uint32_t c1, uint32_t c2, uint32_t c3)
+{
+    int lx, hx, ly, hy;
+    if (olivec_normalize_triangle(oc.width, oc.height, x1, y1, x2, y2, x3, y3, &lx, &hx, &ly, &hy)) {
+        for (int y = ly; y <= hy; ++y) {
+            for (int x = lx; x <= hx; ++x) {
+                int u1, u2, det;
+                if (olivec_barycentric(x1, y1, x2, y2, x3, y3, x, y, &u1, &u2, &det)) {
+                    olivec_blend_color(&OLIVEC_PIXEL(oc, x, y), mix_colors3(c1, c2, c3, u1, u2, det));
                 }
             }
         }
     }
+}
 
-    int dx32 = x2 - x3;
-    int dy32 = y2 - y3;
-    int dx31 = x1 - x3;
-    int dy31 = y1 - y3;
-
-    for (int y = y2; y <= y3; ++y) {
-        if (0 <= y && (size_t) y < oc.height) {
-            int s1 = dy32 != 0 ? (y - y3)*dx32/dy32 + x3 : x3;
-            int s2 = dy31 != 0 ? (y - y3)*dx31/dy31 + x3 : x3;
-            if (s1 > s2) OLIVEC_SWAP(int, s1, s2);
-            for (int x = s1; x <= s2; ++x) {
-                if (0 <= x && (size_t) x < oc.width) {
-                    int u1, u2, det;
-                    barycentric(x1, y1, x2, y2, x3, y3, x, y, &u1, &u2, &det);
-                    uint32_t color = mix_colors3(c1, c2, c3, u1, u2, det - u1 - u2, det);
-                    olivec_blend_color(&OLIVEC_PIXEL(oc, x, y), color);
+OLIVECDEF void olivec_triangle3z(Olivec_Canvas oc, int x1, int y1, int x2, int y2, int x3, int y3, float z1, float z2, float z3)
+{
+    int lx, hx, ly, hy;
+    if (olivec_normalize_triangle(oc.width, oc.height, x1, y1, x2, y2, x3, y3, &lx, &hx, &ly, &hy)) {
+        for (int y = ly; y <= hy; ++y) {
+            for (int x = lx; x <= hx; ++x) {
+                int u1, u2, det;
+                if (olivec_barycentric(x1, y1, x2, y2, x3, y3, x, y, &u1, &u2, &det)) {
+                    float z = z1*u1/det + z2*u2/det + z3*(det - u1 - u2)/det;
+                    OLIVEC_PIXEL(oc, x, y) = *(uint32_t*)&z;
                 }
             }
         }
     }
 }
 
-// TODO: AA for triangle
-OLIVECDEF void olivec_triangle(Olivec_Canvas oc, int x1, int y1, int x2, int y2, int x3, int y3, uint32_t color)
+OLIVECDEF void olivec_triangle3uv(Olivec_Canvas oc, int x1, int y1, int x2, int y2, int x3, int y3, float tx1, float ty1, float tx2, float ty2, float tx3, float ty3, float z1, float z2, float z3, Olivec_Canvas texture)
 {
-    if (y1 > y2) {
-        OLIVEC_SWAP(int, x1, x2);
-        OLIVEC_SWAP(int, y1, y2);
-    }
-
-    if (y2 > y3) {
-        OLIVEC_SWAP(int, x2, x3);
-        OLIVEC_SWAP(int, y2, y3);
-    }
-
-    if (y1 > y2) {
-        OLIVEC_SWAP(int, x1, x2);
-        OLIVEC_SWAP(int, y1, y2);
+    int lx, hx, ly, hy;
+    if (olivec_normalize_triangle(oc.width, oc.height, x1, y1, x2, y2, x3, y3, &lx, &hx, &ly, &hy)) {
+        for (int y = ly; y <= hy; ++y) {
+            for (int x = lx; x <= hx; ++x) {
+                int u1, u2, det;
+                if (olivec_barycentric(x1, y1, x2, y2, x3, y3, x, y, &u1, &u2, &det)) {
+                    int u3 = det - u1 - u2;
+                    float z = z1*u1/det + z2*u2/det + z3*(det - u1 - u2)/det;
+                    float tx = tx1*u1/det + tx2*u2/det + tx3*u3/det;
+                    float ty = ty1*u1/det + ty2*u2/det + ty3*u3/det;
+
+                    int texture_x = tx/z*texture.width;
+                    if (texture_x < 0) texture_x = 0;
+                    if ((size_t) texture_x >= texture.width) texture_x = texture.width - 1;
+
+                    int texture_y = ty/z*texture.height;
+                    if (texture_y < 0) texture_y = 0;
+                    if ((size_t) texture_y >= texture.height) texture_y = texture.height - 1;
+                    OLIVEC_PIXEL(oc, x, y) = OLIVEC_PIXEL(texture, (int)texture_x, (int)texture_y);
+                }
+            }
+        }
     }
+}
 
-    int dx12 = x2 - x1;
-    int dy12 = y2 - y1;
-    int dx13 = x3 - x1;
-    int dy13 = y3 - y1;
-
-    for (int y = y1; y <= y2; ++y) {
-        // TODO: move boundary checks outside of loops in olivec_fill_triangle
-        if (0 <= y && (size_t) y < oc.height) {
-            int s1 = dy12 != 0 ? (y - y1)*dx12/dy12 + x1 : x1;
-            int s2 = dy13 != 0 ? (y - y1)*dx13/dy13 + x1 : x1;
-            if (s1 > s2) OLIVEC_SWAP(int, s1, s2);
-            for (int x = s1; x <= s2; ++x) {
-                if (0 <= x && (size_t) x < oc.width) {
-                    olivec_blend_color(&OLIVEC_PIXEL(oc, x, y), color);
+OLIVECDEF void olivec_triangle3uv_bilinear(Olivec_Canvas oc, int x1, int y1, int x2, int y2, int x3, int y3, float tx1, float ty1, float tx2, float ty2, float tx3, float ty3, float z1, float z2, float z3, Olivec_Canvas texture)
+{
+    int lx, hx, ly, hy;
+    if (olivec_normalize_triangle(oc.width, oc.height, x1, y1, x2, y2, x3, y3, &lx, &hx, &ly, &hy)) {
+        for (int y = ly; y <= hy; ++y) {
+            for (int x = lx; x <= hx; ++x) {
+                int u1, u2, det;
+                if (olivec_barycentric(x1, y1, x2, y2, x3, y3, x, y, &u1, &u2, &det)) {
+                    int u3 = det - u1 - u2;
+                    float z = z1*u1/det + z2*u2/det + z3*(det - u1 - u2)/det;
+                    float tx = tx1*u1/det + tx2*u2/det + tx3*u3/det;
+                    float ty = ty1*u1/det + ty2*u2/det + ty3*u3/det;
+
+                    float texture_x = tx/z*texture.width;
+                    if (texture_x < 0) texture_x = 0;
+                    if (texture_x >= (float) texture.width) texture_x = texture.width - 1;
+
+                    float texture_y = ty/z*texture.height;
+                    if (texture_y < 0) texture_y = 0;
+                    if (texture_y >= (float) texture.height) texture_y = texture.height - 1;
+
+                    int precision = 100;
+                    OLIVEC_PIXEL(oc, x, y) = olivec_pixel_bilinear(
+                                                 texture,
+                                                 texture_x*precision, texture_y*precision,
+                                                 precision, precision);
                 }
             }
         }
     }
+}
 
-    int dx32 = x2 - x3;
-    int dy32 = y2 - y3;
-    int dx31 = x1 - x3;
-    int dy31 = y1 - y3;
-
-    for (int y = y2; y <= y3; ++y) {
-        if (0 <= y && (size_t) y < oc.height) {
-            int s1 = dy32 != 0 ? (y - y3)*dx32/dy32 + x3 : x3;
-            int s2 = dy31 != 0 ? (y - y3)*dx31/dy31 + x3 : x3;
-            if (s1 > s2) OLIVEC_SWAP(int, s1, s2);
-            for (int x = s1; x <= s2; ++x) {
-                if (0 <= x && (size_t) x < oc.width) {
+// TODO: AA for triangle
+OLIVECDEF void olivec_triangle(Olivec_Canvas oc, int x1, int y1, int x2, int y2, int x3, int y3, uint32_t color)
+{
+    int lx, hx, ly, hy;
+    if (olivec_normalize_triangle(oc.width, oc.height, x1, y1, x2, y2, x3, y3, &lx, &hx, &ly, &hy)) {
+        for (int y = ly; y <= hy; ++y) {
+            for (int x = lx; x <= hx; ++x) {
+                int u1, u2, det;
+                if (olivec_barycentric(x1, y1, x2, y2, x3, y3, x, y, &u1, &u2, &det)) {
                     olivec_blend_color(&OLIVEC_PIXEL(oc, x, y), color);
                 }
             }
@@ -797,30 +908,115 @@ OLIVECDEF void olivec_text(Olivec_Canvas oc, const char *text, int tx, int ty, O
     }
 }
 
-// TODO: bilinear interpolation for olivec_copy
-OLIVECDEF void olivec_copy(Olivec_Canvas src, Olivec_Canvas dst, int x, int y, int w, int h)
+OLIVECDEF void olivec_sprite_blend(Olivec_Canvas oc, int x, int y, int w, int h, Olivec_Canvas sprite)
 {
-    int x1, x2, y1, y2;
-    if (olivec_normalize_rect(x, y, w, h, dst.width, dst.height, &x1, &x2, &y1, &y2)) {
-        int xa = x1; if (w < 0) xa = x2;
-        int ya = y1; if (h < 0) ya = y2;
-        for (int y = y1; y <= y2; ++y) {
-            for (int x = x1; x <= x2; ++x) {
-                size_t nx = (x - xa)*((int) src.width)/w;
-                size_t ny = (y - ya)*((int) src.height)/h;
-                olivec_blend_color(&OLIVEC_PIXEL(dst, x, y), OLIVEC_PIXEL(src, nx, ny));
-            }
+    if (sprite.width == 0) return;
+    if (sprite.height == 0) return;
+
+    Olivec_Normalized_Rect nr = {0};
+    if (!olivec_normalize_rect(x, y, w, h, oc.width, oc.height, &nr)) return;
+
+    int xa = nr.ox1;
+    if (w < 0) xa = nr.ox2;
+    int ya = nr.oy1;
+    if (h < 0) ya = nr.oy2;
+    for (int y = nr.y1; y <= nr.y2; ++y) {
+        for (int x = nr.x1; x <= nr.x2; ++x) {
+            size_t nx = (x - xa)*((int) sprite.width)/w;
+            size_t ny = (y - ya)*((int) sprite.height)/h;
+            olivec_blend_color(&OLIVEC_PIXEL(oc, x, y), OLIVEC_PIXEL(sprite, nx, ny));
+        }
+    }
+}
+
+OLIVECDEF void olivec_sprite_copy(Olivec_Canvas oc, int x, int y, int w, int h, Olivec_Canvas sprite)
+{
+    if (sprite.width == 0) return;
+    if (sprite.height == 0) return;
+
+    // TODO: consider introducing flip parameter instead of relying on negative width and height
+    // Similar to how SDL_RenderCopyEx does that
+    Olivec_Normalized_Rect nr = {0};
+    if (!olivec_normalize_rect(x, y, w, h, oc.width, oc.height, &nr)) return;
+
+    int xa = nr.ox1;
+    if (w < 0) xa = nr.ox2;
+    int ya = nr.oy1;
+    if (h < 0) ya = nr.oy2;
+    for (int y = nr.y1; y <= nr.y2; ++y) {
+        for (int x = nr.x1; x <= nr.x2; ++x) {
+            size_t nx = (x - xa)*((int) sprite.width)/w;
+            size_t ny = (y - ya)*((int) sprite.height)/h;
+            OLIVEC_PIXEL(oc, x, y) = OLIVEC_PIXEL(sprite, nx, ny);
+        }
+    }
+}
+
+// TODO: olivec_pixel_bilinear does not check for out-of-bounds
+// But maybe it shouldn't. Maybe it's a responsibility of the caller of the function.
+OLIVECDEF uint32_t olivec_pixel_bilinear(Olivec_Canvas sprite, int nx, int ny, int w, int h)
+{
+    int px = nx%w;
+    int py = ny%h;
+
+    int x1 = nx/w, x2 = nx/w;
+    int y1 = ny/h, y2 = ny/h;
+    if (px < w/2) {
+        // left
+        px += w/2;
+        x1 -= 1;
+        if (x1 < 0) x1 = 0;
+    } else {
+        // right
+        px -= w/2;
+        x2 += 1;
+        if ((size_t) x2 >= sprite.width) x2 = sprite.width - 1;
+    }
+
+    if (py < h/2) {
+        // top
+        py += h/2;
+        y1 -= 1;
+        if (y1 < 0) y1 = 0;
+    } else {
+        // bottom
+        py -= h/2;
+        y2 += 1;
+        if ((size_t) y2 >= sprite.height) y2 = sprite.height - 1;
+    }
+
+    return mix_colors2(mix_colors2(OLIVEC_PIXEL(sprite, x1, y1),
+                                   OLIVEC_PIXEL(sprite, x2, y1),
+                                   px, w),
+                       mix_colors2(OLIVEC_PIXEL(sprite, x1, y2),
+                                   OLIVEC_PIXEL(sprite, x2, y2),
+                                   px, w),
+                       py, h);
+}
+
+OLIVECDEF void olivec_sprite_copy_bilinear(Olivec_Canvas oc, int x, int y, int w, int h, Olivec_Canvas sprite)
+{
+    // TODO: support negative size in olivec_sprite_copy_bilinear()
+    if (w <= 0) return;
+    if (h <= 0) return;
+
+    Olivec_Normalized_Rect nr = {0};
+    if (!olivec_normalize_rect(x, y, w, h, oc.width, oc.height, &nr)) return;
+
+    for (int y = nr.y1; y <= nr.y2; ++y) {
+        for (int x = nr.x1; x <= nr.x2; ++x) {
+            size_t nx = (x - nr.ox1)*sprite.width;
+            size_t ny = (y - nr.oy1)*sprite.height;
+            OLIVEC_PIXEL(oc, x, y) = olivec_pixel_bilinear(sprite, nx, ny, w, h);
         }
     }
 }
 
 #endif // OLIVEC_IMPLEMENTATION
 
-// TODO: 3D triangles with z-buffering
-// TODO: 3D textures
-// TODO: Stencil
 // TODO: Benchmarking
 // TODO: SIMD implementations
-// TODO: olivec_ring
-// TODO: olivec_ellipse
 // TODO: bezier curves
+// TODO: olivec_ring
+// TODO: fuzzer
+// TODO: Stencil

png2c.c

@@ -1,51 +0,0 @@
-#include <assert.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <stdint.h>
-
-#define STB_IMAGE_IMPLEMENTATION
-#include "./stb_image.h"
-
-const char *shift(int *argc, char ***argv)
-{
-    assert(*argc > 0);
-    const char *result = *argv[0];
-    *argc -= 1;
-    *argv += 1;
-    return result;
-}
-
-int main(int argc, char *argv[])
-{
-    shift(&argc, &argv);        // skip program name
-
-    if (argc <= 0) {
-        fprintf(stderr, "Usage: png2c <filepath.png>\n");
-        fprintf(stderr, "ERROR: expected file path\n");
-        exit(1);
-    }
-
-    const char *filepath = shift(&argc, &argv);
-
-    int x, y, n;
-    uint32_t *data = (uint32_t *)stbi_load(filepath, &x, &y, &n, 4);
-
-    if (data == NULL) {
-        fprintf(stderr, "Could not load file `%s`\n", filepath);
-        exit(1);
-    }
-
-    // TODO: inclusion guards and the array name are not customizable
-    printf("#ifndef PNG_H_\n");
-    printf("#define PNG_H_\n");
-    printf("size_t png_width = %d;\n", x);
-    printf("size_t png_height = %d;\n", y);
-    printf("uint32_t png[] = {");
-    for (size_t i = 0; i < (size_t)(x * y); ++i) {
-        printf("0x%x, ", data[i]);
-    }
-    printf("};\n");
-    printf("#endif // PNG_H_\n");
-
-    return 0;
-}

test.c

@@ -6,6 +6,9 @@
 #include <errno.h>
 
 #include "./assets/tsodinPog.c"
+#include "./assets/tsodinCup.c"
+
+#define PI 3.14159265359
 
 #define return_defer(value) do { result = (value); goto defer; } while (0)
 #define UNUSED(x) (void)(x)
@@ -133,6 +136,9 @@ static inline size_t max_size(size_t a, size_t b)
 
 Replay_Result run_test_case(const char *program_path, const Test_Case *tc)
 {
+    printf("%s:", tc->id);
+    fflush(stdout);
+
     const char *expected_file_path = tc->expected_file_path;
     const char *actual_file_path = tc->actual_file_path;
     const char *diff_file_path = tc->diff_file_path;
@@ -141,9 +147,10 @@ Replay_Result run_test_case(const char *program_path, const Test_Case *tc)
 
     Olivec_Canvas expected_canvas;
     if (!canvas_stbi_load(expected_file_path, &expected_canvas)) {
-        fprintf(stderr, "%s: ERROR: could not read %s: %s\n", tc->id, expected_file_path, stbi_failure_reason());
+        fprintf(stderr, "\n");
+        fprintf(stderr, "  ERROR: could not read %s: %s\n", expected_file_path, stbi_failure_reason());
         if (errno == ENOENT) {
-            fprintf(stderr, "%s: HINT: Consider running `$ %s update %s` to create it\n", tc->id, program_path, tc->id);
+            fprintf(stderr, "  HINT: Consider running `$ %s update %s` to create it\n", program_path, tc->id);
         }
         return(REPLAY_ERRORED);
     }
@@ -174,26 +181,27 @@ Replay_Result run_test_case(const char *program_path, const Test_Case *tc)
     }
 
     if (failed) {
+        fprintf(stderr, "\n");
 
         if (!canvas_stbi_save(actual_canvas, actual_file_path)) {
-            fprintf(stderr, "ERROR: could not write image file with actual pixels %s: %s\n", actual_file_path, strerror(errno));
+            fprintf(stderr, "  ERROR: could not write image file with actual pixels %s: %s\n", actual_file_path, strerror(errno));
             return(REPLAY_ERRORED);
         }
 
         if (!canvas_stbi_save(diff_canvas, diff_file_path)) {
-            fprintf(stderr, "ERROR: could not wrilte diff image file %s: %s\n", diff_file_path, strerror(errno));
+            fprintf(stderr, "  ERROR: could not wrilte diff image file %s: %s\n", diff_file_path, strerror(errno));
             return(REPLAY_ERRORED);
         }
 
-        fprintf(stderr, "%s: TEST FAILURE: unexpected pixels in generated image\n", tc->id);
-        fprintf(stderr, "%s:   Expected: %s\n", tc->id, expected_file_path);
-        fprintf(stderr, "%s:   Actual:   %s\n", tc->id, actual_file_path);
-        fprintf(stderr, "%s:   Diff:     %s\n", tc->id, diff_file_path);
-        fprintf(stderr, "%s: HINT: If this behaviour is intentional confirm that by updating the image with `$ %s update`\n", tc->id, program_path);
+        fprintf(stderr, "  TEST FAILURE: unexpected pixels in generated image\n");
+        fprintf(stderr, "    Expected: %s\n", expected_file_path);
+        fprintf(stderr, "    Actual:   %s\n", actual_file_path);
+        fprintf(stderr, "    Diff:     %s\n", diff_file_path);
+        fprintf(stderr, "  HINT: If this behaviour is intentional confirm that by updating the image with `$ %s update`\n", program_path);
         return(REPLAY_FAILED);
     }
 
-    printf("%s: OK\n", tc->id);
+    printf(" OK\n");
 
     return(REPLAY_PASSED);
 }
@@ -275,7 +283,8 @@ Olivec_Canvas test_alpha_blending(void)
     olivec_rect(oc, 0, 0, width*3/4, height*3/4, RED_COLOR);
     olivec_rect(oc, width-1, height-1, -width*3/4, -height*3/4, 0x5520AA20);
     olivec_circle(oc, width/2, height/2, width/4, 0xBBAA2020);
-    olivec_triangle(oc, 0, height, width, height, width/2, 0, 0xBB20AAAA);
+    olivec_triangle(oc, 0, height-1, width-1, height-1, width/2, 0, 0xBB20AAAA);
+    olivec_triangle3c(oc, 0, 0, width-1, 0, width/2, height-1, 0xBB2020AA, 0xBB20AA20, 0xBBAA2020);
     return oc;
 }
 
@@ -342,7 +351,7 @@ Olivec_Canvas test_lines_circle(void)
     olivec_fill(oc, BACKGROUND_COLOR);
 
     size_t n = 20;
-    float angle = 2*M_PI/n;
+    float angle = 2*PI/n;
     float length = width;
     if (length > height) length = height;
     length /= 3;
@@ -383,7 +392,7 @@ Olivec_Canvas test_hello_world_text_rendering(void)
     size_t text_len = strlen(text);
     Olivec_Canvas oc = canvas_alloc(400, 150);
     olivec_fill(oc, BACKGROUND_COLOR);
-    olivec_text(oc, text, oc.width/2 - DEFAULT_FONT_WIDTH*size*text_len/2, oc.height/2 - DEFAULT_FONT_HEIGHT*size/2, default_font, size, FOREGROUND_COLOR);
+    olivec_text(oc, text, oc.width/2 - OLIVEC_DEFAULT_FONT_WIDTH*size*text_len/2, oc.height/2 - OLIVEC_DEFAULT_FONT_HEIGHT*size/2, olivec_default_font, size, FOREGROUND_COLOR);
     return oc;
 }
 
@@ -448,7 +457,7 @@ Olivec_Canvas test_frame(void)
     return oc;
 }
 
-Olivec_Canvas test_blending_of_copy(void)
+Olivec_Canvas test_sprite_blend(void)
 {
     size_t width = 128;
     size_t height = 128;
@@ -466,36 +475,156 @@ Olivec_Canvas test_blending_of_copy(void)
         }
     }
 
-    olivec_copy(src, dst, 0, 0, width, height);
+    olivec_sprite_blend(dst, 0, 0, width, height, src);
 
     return dst;
 }
 
-Olivec_Canvas test_copy_out_of_bounds_cut(void)
+Olivec_Canvas test_sprite_blend_out_of_bounds_cut(void)
 {
     size_t width = 128;
     size_t height = 128;
     Olivec_Canvas dst = canvas_alloc(width, height);
+    Olivec_Canvas src = olivec_canvas(tsodinPog_pixels, tsodinPog_width, tsodinPog_height, tsodinPog_width);
     olivec_fill(dst, RED_COLOR);
-    olivec_copy(
-        olivec_canvas(png, png_width, png_height, png_width),
-        dst,
-        width/2, height/2, width, height);
+    olivec_sprite_blend(dst, -width/2, -height/2, width, height, src);
+    olivec_sprite_blend(dst, width/2, -height/2, width, height, src);
+    olivec_sprite_blend(dst, -width/2, height/2, width, height, src);
+    olivec_sprite_blend(dst, width/2, height/2, width, height, src);
+    return dst;
+}
 
+Olivec_Canvas test_sprite_blend_flip(void)
+{
+    size_t width = 128;
+    size_t height = 128;
+    Olivec_Canvas dst = canvas_alloc(width, height);
+    Olivec_Canvas src = olivec_canvas(tsodinPog_pixels, tsodinPog_width, tsodinPog_height, tsodinPog_width);
+    olivec_fill(dst, RED_COLOR);
+    olivec_sprite_blend(dst, 0, 0, width/2, height/2, src);
+    olivec_sprite_blend(dst, width - 1, 0, -width/2, height/2, src);
+    olivec_sprite_blend(dst, 0, height - 1, width/2, -height/2, src);
+    olivec_sprite_blend(dst, width - 1, height - 1, -width/2, -height/2, src);
     return dst;
 }
 
-Olivec_Canvas test_copy_flip(void)
+Olivec_Canvas test_sprite_blend_flip_cut(void)
 {
     size_t width = 128;
     size_t height = 128;
     Olivec_Canvas dst = canvas_alloc(width, height);
-    Olivec_Canvas src = olivec_canvas(png, png_width, png_height, png_width);
+    Olivec_Canvas src = olivec_canvas(tsodinPog_pixels, tsodinPog_width, tsodinPog_height, tsodinPog_width);
+    olivec_fill(dst, RED_COLOR);
+    olivec_sprite_blend(dst, -width/2, -height/2, width, height, src);
+    olivec_sprite_blend(dst, width - 1 + width/2, -height/2, -width, height, src);
+    olivec_sprite_blend(dst, -width/2, height - 1 + height/2, width, -height, src);
+    olivec_sprite_blend(dst, width - 1 + width/2, height - 1 + height/2, -width, -height, src);
+    return dst;
+}
+
+Olivec_Canvas test_empty_rect(void)
+{
+    size_t w = 8;
+    size_t h = 8;
+    Olivec_Canvas dst = canvas_alloc(w, h);
+    olivec_fill(dst, BACKGROUND_COLOR);
+    olivec_rect(dst, w/2, h/2, 0, 0, FOREGROUND_COLOR);
+    return dst;
+}
+
+Olivec_Canvas test_sprite_blend_empty_rect(void)
+{
+    size_t w = 8;
+    size_t h = 8;
+    Olivec_Canvas dst = canvas_alloc(w, h);
+    Olivec_Canvas src = olivec_canvas(tsodinPog_pixels, tsodinPog_width, tsodinPog_height, tsodinPog_width);
+    olivec_fill(dst, BACKGROUND_COLOR);
+    olivec_sprite_blend(dst, 0, 0, 0, 0, src);
+    return dst;
+}
+
+Olivec_Canvas test_sprite_blend_null(void)
+{
+    size_t w = 8;
+    size_t h = 8;
+    Olivec_Canvas dst = canvas_alloc(w, h);
+    olivec_fill(dst, BACKGROUND_COLOR);
+    olivec_sprite_blend(dst, 0, 0, w, h, OLIVEC_CANVAS_NULL);
+    return dst;
+}
+
+Olivec_Canvas test_sprite_blend_vs_copy(void)
+{
+    Olivec_Canvas tsodinCup = olivec_canvas(tsodinCup_pixels, tsodinCup_width, tsodinCup_height, tsodinCup_width);
+    size_t w = tsodinCup.width;
+    size_t h = tsodinCup.height*2;
+    Olivec_Canvas dst = canvas_alloc(w, h);
     olivec_fill(dst, RED_COLOR);
-    olivec_copy(src, dst, 0, 0, width/2, height/2);
-    olivec_copy(src, dst, width - 1, 0, -width/2, height/2);
-    olivec_copy(src, dst, 0, height - 1, width/2, -height/2);
-    olivec_copy(src, dst, width - 1, height - 1, -width/2, -height/2);
+    olivec_sprite_blend(dst, 0, 0, tsodinCup.width, tsodinCup.height, tsodinCup);
+    olivec_sprite_copy(dst, 0, tsodinCup.height, tsodinCup.width, tsodinCup.height, tsodinCup);
+    return dst;
+}
+
+Olivec_Canvas test_barycentric_overflow(void)
+{
+    size_t w = 256;
+    size_t h = 256;
+    Olivec_Canvas dst = canvas_alloc(w, h);
+    olivec_fill(dst, 0xFF181818);
+    olivec_triangle3c(dst, w/4, h/4, w/2, 0, 0, h, 0xFF0000FF, 0xFF00FF00, 0xFFFF0000);
+    return dst;
+}
+
+Olivec_Canvas test_triangle_order_flip(void)
+{
+    size_t w = 256;
+    size_t h = 256;
+    Olivec_Canvas dst = canvas_alloc(w, h);
+    olivec_fill(dst, 0xFF181818);
+    olivec_triangle3c(
+        dst,
+        w/4, h/4,
+        0, h,
+        w, 0,
+        0xFF00FF00,
+        0xFFFF0000,
+        0xFF0000FF);
+    return dst;
+}
+
+Olivec_Canvas test_bilinear_interpolation(void)
+{
+    size_t factor = 2;
+    Olivec_Canvas src = olivec_canvas(tsodinPog_pixels, tsodinPog_width, tsodinPog_height, tsodinPog_width);
+    Olivec_Canvas dst = canvas_alloc(src.width*factor*2, src.height*factor);
+    olivec_fill(dst, RED_COLOR);
+    olivec_sprite_copy(dst, 0, 0, src.width*factor, src.height*factor, src);
+    olivec_sprite_copy_bilinear(dst, src.width*factor, 0, src.width*factor, src.height*factor, src);
+    return dst;
+}
+
+Olivec_Canvas test_fill_ellipse(void)
+{
+    size_t factor = 3;
+    Olivec_Canvas dst = canvas_alloc(100*factor, 50*factor);
+    olivec_fill(dst, BACKGROUND_COLOR);
+    olivec_ellipse(dst, dst.width/2, dst.height/2, dst.width/3, dst.height/3, RED_COLOR);
+    return dst;
+}
+
+Olivec_Canvas test_line_bug_offset(void)
+{
+    size_t factor = 3;
+    size_t width = 100*factor;
+    size_t height = 50*factor;
+    Olivec_Canvas dst = canvas_alloc(width, height);
+    olivec_fill(dst, BACKGROUND_COLOR);
+    int x1 = 50;
+    int y1 = 100;
+    int x2 = 0;
+    int y2 = -100;
+    olivec_line(dst, x1, y1, x2, y2, GREEN_COLOR);
+    olivec_circle(dst, x1, y1, 5, RED_COLOR);
     return dst;
 }
 
@@ -512,9 +641,19 @@ Test_Case test_cases[] = {
     DEFINE_TEST_CASE(lines_circle),
     DEFINE_TEST_CASE(line_edge_cases),
     DEFINE_TEST_CASE(frame),
-    DEFINE_TEST_CASE(blending_of_copy),
-    DEFINE_TEST_CASE(copy_out_of_bounds_cut),
-    DEFINE_TEST_CASE(copy_flip),
+    DEFINE_TEST_CASE(sprite_blend),
+    DEFINE_TEST_CASE(sprite_blend_out_of_bounds_cut),
+    DEFINE_TEST_CASE(sprite_blend_flip),
+    DEFINE_TEST_CASE(sprite_blend_flip_cut),
+    DEFINE_TEST_CASE(sprite_blend_empty_rect),
+    DEFINE_TEST_CASE(empty_rect),
+    DEFINE_TEST_CASE(sprite_blend_null),
+    DEFINE_TEST_CASE(sprite_blend_vs_copy),
+    DEFINE_TEST_CASE(triangle_order_flip),
+    DEFINE_TEST_CASE(barycentric_overflow),
+    DEFINE_TEST_CASE(bilinear_interpolation),
+    DEFINE_TEST_CASE(fill_ellipse),
+    DEFINE_TEST_CASE(line_bug_offset),
 };
 #define TEST_CASES_COUNT (sizeof(test_cases)/sizeof(test_cases[0]))
 

tools/obj2c.c

@@ -0,0 +1,328 @@
+#include <stdio.h>
+#include <errno.h>
+#include <float.h>
+#include <limits.h>
+#include <string.h>
+
+#define SV_IMPLEMENTATION
+#include "sv.h"
+
+#define ARENA_IMPLEMENTATION
+#include "arena.h"
+
+#define return_defer(value) do { result = (value); goto defer; } while (0)
+typedef int Errno;
+#define UNUSED(x) (void)(x)
+
+const char *shift(int *argc, char ***argv)
+{
+    assert(*argc > 0);
+    const char *result = *argv[0];
+    *argc -= 1;
+    *argv += 1;
+    return result;
+}
+
+static Arena default_arena = {0};
+static Arena *context_arena = &default_arena;
+
+static void *context_alloc(size_t size)
+{
+    assert(context_arena);
+    return arena_alloc(context_arena, size);
+}
+
+static void *context_realloc(void *oldp, size_t oldsz, size_t newsz)
+{
+    if (newsz <= oldsz) return oldp;
+    return memcpy(context_alloc(newsz), oldp, oldsz);
+}
+
+Errno read_entire_file(const char *file_path, char **buffer, size_t *buffer_size)
+{
+    Errno result = 0;
+    FILE *f = NULL;
+
+    f = fopen(file_path, "rb");
+    if (f == NULL) return_defer(errno);
+
+    if (fseek(f, 0, SEEK_END) < 0) return_defer(errno);
+    long m = ftell(f);
+    if (m < 0) return_defer(errno);
+    if (fseek(f, 0, SEEK_SET) < 0) return_defer(errno);
+
+    *buffer_size = m;
+    *buffer = context_alloc(*buffer_size + 1);
+    (*buffer)[*buffer_size] = '\0';
+
+    fread(*buffer, *buffer_size, 1, f);
+    if (ferror(f)) return_defer(errno);
+
+defer:
+    if (f) fclose(f);
+    return result;
+}
+
+typedef struct {
+    float x, y;
+} Vector2;
+
+Vector2 make_vector2(float x, float y)
+{
+    Vector2 v2;
+    v2.x = x;
+    v2.y = y;
+    return v2;
+}
+
+typedef struct {
+    float x, y, z;
+} Vector3;
+
+Vector3 make_vector3(float x, float y, float z)
+{
+    Vector3 v3;
+    v3.x = x;
+    v3.y = y;
+    v3.z = z;
+    return v3;
+}
+
+typedef struct {
+    Vector3 *items;
+    size_t capacity;
+    size_t count;
+} Vertices;
+
+typedef struct {
+    int a, b, c;
+} Face;
+
+Face make_face(int a, int b, int c)
+{
+    Face f = {
+        .a = a,
+        .b = b,
+        .c = c,
+    };
+    return f;
+}
+
+typedef struct {
+    Face *items;
+    size_t capacity;
+    size_t count;
+} Faces;
+
+#define DA_INIT_CAPACITY 8192
+#define DA_REALLOC context_realloc
+#define da_append(da, item)                                                 \
+    do {                                                                    \
+        if ((da)->count >= (da)->capacity) {                                \
+            size_t new_capacity = (da)->capacity*2;                         \
+            if (new_capacity == 0) {                                        \
+                new_capacity = DA_INIT_CAPACITY;                            \
+            }                                                               \
+                                                                            \
+            (da)->items = DA_REALLOC((da)->items,                           \
+                                     (da)->capacity*sizeof((da)->items[0]), \
+                                     new_capacity*sizeof((da)->items[0]));  \
+            (da)->capacity = new_capacity;                                  \
+        }                                                                   \
+                                                                            \
+        (da)->items[(da)->count++] = (item);                                \
+    } while (0)
+
+void generate_code(FILE *out, Vertices vertices, Faces faces)
+{
+    fprintf(out, "#ifndef OBJ_H_\n");
+    fprintf(out, "#define OBJ_H_\n");
+    fprintf(out, "#define vertices_count %zu\n", vertices.count);
+    fprintf(out, "static const float vertices[][3] = {\n");
+    for (size_t i = 0; i < vertices.count; ++i) {
+        Vector3 v = vertices.items[i];
+        fprintf(out, "    {%f, %f, %f},\n", v.x, v.y, v.z);
+    }
+    fprintf(out, "};\n");
+
+    fprintf(out, "static const int faces[%zu][3] = {\n", faces.count);
+    for (size_t i = 0; i < faces.count; ++i) {
+        Face f = faces.items[i];
+        fprintf(out, "    {%d, %d, %d},\n", f.a, f.b, f.c);
+    }
+    fprintf(out, "};\n");
+    fprintf(out, "#define faces_count %zu\n", faces.count);
+    fprintf(out, "#endif // OBJ_H_\n");
+}
+
+Vector3 remap_object(Vector3 v, float scale, float lx, float hx, float ly, float hy, float lz, float hz)
+{
+    float cx = lx + (hx - lx)/2;
+    float cy = ly + (hy - ly)/2;
+    float cz = lz + (hz - lz)/2;
+    v.z = (v.z - cz)*scale;
+    v.x = (v.x - cx)*scale;
+    v.y = (v.y - cy)*scale;
+    return v;
+}
+
+void usage(const char *program_name)
+{
+    fprintf(stderr, "Usage: %s [OPTIONS] <INPUT.obj>\n", program_name);
+    fprintf(stderr, "Options:\n");
+    fprintf(stderr, "    -o    output file path\n");
+    fprintf(stderr, "    -s    scale the model\n");
+}
+
+int main(int argc, char **argv)
+{
+    int result = 0;
+
+    assert(argc > 0);
+    const char *program_name = shift(&argc, &argv);
+    const char *output_file_path = NULL;
+    const char *input_file_path = NULL;
+    float scale = 0.75;
+
+    // TODO: consider using https://github.com/tsoding/flag.h in here
+    while (argc > 0) {
+        const char *flag = shift(&argc, &argv);
+        if (strcmp(flag, "-o") == 0) {
+            if (argc <= 0) {
+                usage(program_name);
+                fprintf(stderr, "ERROR: no value is provided for flag %s\n", flag);
+                return_defer(1);
+            }
+
+            if (output_file_path != NULL) {
+                usage(program_name);
+                fprintf(stderr, "ERROR: %s was already provided\n", flag);
+                return_defer(1);
+            }
+
+            output_file_path = shift(&argc, &argv);
+        } else if (strcmp(flag, "-s") == 0) {
+            if (argc <= 0) {
+                usage(program_name);
+                fprintf(stderr, "ERROR: no value is provided for flag %s\n", flag);
+                return_defer(1);
+            }
+
+            const char *value = shift(&argc, &argv);
+            scale = strtof(value, NULL);
+        } else {
+            if (input_file_path != NULL) {
+                usage(program_name);
+                fprintf(stderr, "ERROR: input file path was already provided\n");
+                return_defer(1);
+            }
+            input_file_path = flag;
+        }
+    }
+
+    if (input_file_path == NULL) {
+        usage(program_name);
+        fprintf(stderr, "ERROR: no input file path is provided\n");
+        return_defer(1);
+    }
+
+    if (output_file_path == NULL) {
+        usage(program_name);
+        fprintf(stderr, "ERROR: no output file path is provided\n");
+        return_defer(1);
+    }
+
+    char *buffer;
+    size_t buffer_size;
+    Errno err = read_entire_file(input_file_path, &buffer, &buffer_size);
+    if (err != 0) {
+        fprintf(stderr, "ERROR: could not read file %s: %s\n", input_file_path, strerror(errno));
+        return_defer(1);
+    }
+
+    String_View content = sv_from_parts(buffer, buffer_size);
+    Vertices vertices = {0};
+    Faces faces = {0};
+    float lx = FLT_MAX, hx = FLT_MIN;
+    float ly = FLT_MAX, hy = FLT_MIN;
+    float lz = FLT_MAX, hz = FLT_MIN;
+    int lf = INT_MAX, hf = INT_MIN;
+    for (size_t line_number = 0; content.count > 0; ++line_number) {
+        String_View line = sv_trim_left(sv_chop_by_delim(&content, '\n'));
+        if (line.count > 0 && *line.data != '#') {
+            String_View kind = sv_chop_by_delim(&line, ' ');
+            if (sv_eq(kind, SV("v"))) {
+                char *endptr;
+
+                line = sv_trim_left(line);
+                float x = strtof(line.data, &endptr);
+                line.data = endptr;
+                if (lx > x) lx = x;
+                if (hx < x) hx = x;
+
+                line = sv_trim_left(line);
+                float y = strtof(line.data, &endptr);
+                line.data = endptr;
+                if (ly > y) ly = y;
+                if (hy < y) hy = y;
+
+                line = sv_trim_left(line);
+                float z = strtof(line.data, &endptr);
+                line.data = endptr;
+                if (lz > z) lz = z;
+                if (hz < z) hz = z;
+
+                da_append(&vertices, make_vector3(x, y, z));
+            } else if (sv_eq(kind, SV("f"))) {
+                char *endptr;
+
+                line = sv_trim_left(line);
+                int a = strtol(line.data, &endptr, 10);
+                line.data = endptr;
+                if (lf > a) lf = a;
+                if (hf < a) hf = a;
+
+                line = sv_trim_left(line);
+                int b = strtol(line.data, &endptr, 10);
+                line.data = endptr;
+                if (lf > b) lf = b;
+                if (hf < b) hf = b;
+
+                line = sv_trim_left(line);
+                int c = strtol(line.data, &endptr, 10);
+                line.data = endptr;
+                if (lf > c) lf = c;
+                if (hf < c) hf = c;
+
+                da_append(&faces, make_face(a, b, c));
+            } else {
+                fprintf(stderr, "%s:%zu: unknown kind of entry `"SV_Fmt"`\n", input_file_path, line_number, SV_Arg(kind));
+                return_defer(1);
+            }
+        }
+    }
+    printf("Input:    %s\n", input_file_path);
+    printf("Output:   %s\n", output_file_path);
+    printf("Vertices: %zu (x: %f..%f, y: %f..%f, z: %f..%f)\n", vertices.count, lx, hx, ly, hy, lz, hz);
+    printf("Faces:    %zu (index: %d..%d)\n", faces.count, lf, hf);
+
+    for (size_t i = 0; i < vertices.count; ++i) {
+        vertices.items[i] = remap_object(vertices.items[i], scale, lx, hx, ly, hy, lz, hz);
+    }
+
+    for (size_t i = 0; i < faces.count; ++i) {
+        faces.items[i].a -= 1;
+        faces.items[i].b -= 1;
+        faces.items[i].c -= 1;
+    }
+
+    FILE *out = fopen(output_file_path, "wb");
+    if (out == NULL) {
+        fprintf(stderr, "ERROR: Could not write file %s: %s\n", output_file_path, strerror(errno));
+        return_defer(1);
+    }
+    generate_code(out, vertices, faces);
+
+defer:
+    return result;
+}

tools/png2c.c

@@ -0,0 +1,176 @@
+#include <assert.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include <stdbool.h>
+#include <string.h>
+#include <errno.h>
+#include <ctype.h>
+
+#define STB_IMAGE_IMPLEMENTATION
+#include "./stb_image.h"
+
+#define return_defer(value) do { result = (value); goto defer; } while (0)
+
+const char *shift(int *argc, char ***argv)
+{
+    assert(*argc > 0);
+    const char *result = *argv[0];
+    *argc -= 1;
+    *argv += 1;
+    return result;
+}
+
+void usage(FILE *out, const char *program_name)
+{
+    fprintf(out, "Usage: %s [OPTIONS] <input/file/path.png>\n", program_name);
+    fprintf(out, "Options:\n");
+    fprintf(out, "    -o <output/file/path.h>\n");
+    fprintf(out, "    -n <name>\n");
+}
+
+void generate_c_code_from_pixels(FILE *out, uint32_t *data, int x, int y, const char *name)
+{
+    size_t name_len = strlen(name);
+    char *capital_name = malloc(name_len + 1);
+    assert(capital_name != NULL && "Buy more RAM, I guess");
+    for (size_t i = 0; i < name_len; ++i) {
+        capital_name[i] = toupper(name[i]);
+    }
+    capital_name[name_len] = '\0';
+
+    fprintf(out, "#ifndef %s_H_\n", capital_name);
+    fprintf(out, "#define %s_H_\n", capital_name);
+    fprintf(out, "size_t %s_width = %d;\n", name, x);
+    fprintf(out, "size_t %s_height = %d;\n", name, y);
+    fprintf(out, "uint32_t %s_pixels[] = {\n", name);
+    size_t length = (size_t)(x * y);
+    size_t width = 7;
+    for (size_t i = 0; i < (length + width - 1)/width; ++i) {
+        fprintf(out, "   ");
+        for (size_t j = 0; j < width && i*width + j < length; ++j) {
+            fprintf(out, "0x%08X,", data[i*width + j]);
+        }
+        fprintf(out, "\n");
+    }
+    fprintf(out, "};\n");
+    fprintf(out, "#endif // %s_H_\n", capital_name);
+
+//defer:
+    free(capital_name);
+}
+
+bool generate_c_file_from_png(const char *input_file_path, const char *output_file_path, const char *name)
+{
+    bool result = true;
+
+    FILE *out = NULL;
+    uint32_t *data = NULL;
+
+    {
+        int x, y;
+        data = (uint32_t *)stbi_load(input_file_path, &x, &y, NULL, 4);
+
+        if (data == NULL) {
+            fprintf(stderr, "ERROR: Could not load file `%s`: %s\n", input_file_path, stbi_failure_reason());
+            return_defer(false);
+        }
+
+        if (output_file_path) {
+            out = fopen(output_file_path, "wb");
+            if (out == NULL) {
+                fprintf(stderr, "ERROR: could not write to file `%s`: %s\n", output_file_path, strerror(errno));
+                return_defer(false);
+            }
+            generate_c_code_from_pixels(out, data, x, y, name);
+        } else {
+            generate_c_code_from_pixels(stdout, data, x, y, name);
+        }
+    }
+
+defer:
+    if (out) fclose(out);
+    if (data) stbi_image_free(data);
+    return result;
+}
+
+int main(int argc, char *argv[])
+{
+    assert(argc > 0);
+    const char *program_name = shift(&argc, &argv);
+    const char *output_file_path = NULL;
+    const char *input_file_path = NULL;
+    const char *name = NULL;
+
+    while (argc > 0) {
+        const char *flag = shift(&argc, &argv);
+        if (strcmp(flag, "-o") == 0) {
+            if (argc <= 0) {
+                usage(stderr, program_name);
+                fprintf(stderr, "ERROR: no value is provided for flag %s\n", flag);
+                return 1;
+            }
+
+            if (output_file_path != NULL) {
+                usage(stderr, program_name);
+                fprintf(stderr, "ERROR: %s was already provided\n", flag);
+                return 1;
+            }
+
+            output_file_path = shift(&argc, &argv);
+        } else if (strcmp(flag, "-n") == 0) {
+            if (argc <= 0) {
+                usage(stderr, program_name);
+                fprintf(stderr, "ERROR: no value is provided for flag %s\n", flag);
+                return 1;
+            }
+
+            if (name != NULL) {
+                usage(stderr, program_name);
+                fprintf(stderr, "ERROR: %s was already provided\n", flag);
+                return 1;
+            }
+
+            name = shift(&argc, &argv);
+        } else {
+            if (input_file_path != NULL) {
+                usage(stderr, program_name);
+                fprintf(stderr, "ERROR: input file path was already provided\n");
+                return 1;
+            }
+            input_file_path = flag;
+        }
+    }
+
+    if (input_file_path == NULL) {
+        usage(stderr, program_name);
+        fprintf(stderr, "ERROR: expected input file path\n");
+        return(1);
+    }
+
+    if (name == NULL) {
+        name = "png";
+    } else {
+        size_t n = strlen(name);
+        if (n == 0) {
+            fprintf(stderr, "ERROR: name cannot be empty\n");
+            return 1;
+        }
+
+        if (isdigit(name[0])) {
+            fprintf(stderr, "ERROR: name cannot start from a digit\n");
+            return 1;
+        }
+
+        for (size_t i = 0; i < n; ++i) {
+            if (!isalnum(name[i]) && name[i] != '_') {
+                fprintf(stderr, "ERROR: name can only contains alphanumeric characters and underscores\n");
+                return 1;
+            }
+        }
+    }
+
+    if (!generate_c_file_from_png(input_file_path, output_file_path, name)) return 1;
+
+    return 0;
+}