Reviewed example

examples/core/core_2d_camera_smooth_pixelperfect.c

@@ -5,15 +5,16 @@
 *   This example has been created using raylib 3.7 (www.raylib.com)
 *   raylib is licensed under an unmodified zlib/libpng license (View raylib.h for details)
 *
-*   Example contributed by Giancamillo Alessandroni ([discord]NotManyIdeas#9972 - [github]NotManyIdeasDev) and
+*   Example contributed by Giancamillo Alessandroni (@NotManyIdeasDev) and
 *   reviewed by Ramon Santamaria (@raysan5)
 *
-*   Copyright (c) 2021 Giancamillo Alessandroni (NotManyIdeas#9972) and Ramon Santamaria (@raysan5)
+*   Copyright (c) 2021 Giancamillo Alessandroni (@NotManyIdeasDev) and Ramon Santamaria (@raysan5)
 *
 ********************************************************************************************/
 
 #include "raylib.h"
-#include <math.h>
+
+#include <math.h>       // Required for: sinf(), cosf()
 
 int main(void)
 {
@@ -22,33 +23,32 @@ int main(void)
     const int screenWidth = 800;
     const int screenHeight = 450;
 
-    const int virualScreenWidth = 160;
+    const int virtualScreenWidth = 160;
     const int virtualScreenHeight = 90;
 
-    const float virtualRatio = (float)screenWidth/(float)virualScreenWidth;
+    const float virtualRatio = (float)screenWidth/(float)virtualScreenWidth;
 
     InitWindow(screenWidth, screenHeight, "raylib [core] example - smooth pixel-perfect camera");
 
-    Camera2D worldSpaceCamera = { 0 }; // Game world camera
+    Camera2D worldSpaceCamera = { 0 };  // Game world camera
     worldSpaceCamera.zoom = 1.0f;
 
-    Camera2D screenSpaceCamera = { 0 }; //Smoothing camera
+    Camera2D screenSpaceCamera = { 0 }; // Smoothing camera
     screenSpaceCamera.zoom = 1.0f;
 
-    RenderTexture2D renderTexture = LoadRenderTexture(virualScreenWidth, virtualScreenHeight); //This is where we'll draw all our objects.
+    RenderTexture2D target = LoadRenderTexture(virtualScreenWidth, virtualScreenHeight); // This is where we'll draw all our objects.
 
-    Rectangle firstRectangle = { 70.0f, 35.0f, 20.0f, 20.0f };
-    Rectangle secondRectangle = { 90.0f, 55.0f, 30.0f, 10.0f };
-    Rectangle thirdRectangle = { 80.0f, 65.0f, 15.0f, 25.0f };
+    Rectangle rec01 = { 70.0f, 35.0f, 20.0f, 20.0f };
+    Rectangle rec02 = { 90.0f, 55.0f, 30.0f, 10.0f };
+    Rectangle rec03 = { 80.0f, 65.0f, 15.0f, 25.0f };
 
-    //The renderTexture's height is flipped (in the source Rectangle), due to OpenGL reasons.
-    Rectangle renderTextureSource = { 0.0f, 0.0f, (float)renderTexture.texture.width, (float)-renderTexture.texture.height };
-    Rectangle renderTextureDest = { -virtualRatio, -virtualRatio, screenWidth + (virtualRatio*2), screenHeight + (virtualRatio*2) };
+    // The target's height is flipped (in the source Rectangle), due to OpenGL reasons
+    Rectangle sourceRec = { 0.0f, 0.0f, (float)target.texture.width, -(float)target.texture.height };
+    Rectangle destRec = { -virtualRatio, -virtualRatio, screenWidth + (virtualRatio*2), screenHeight + (virtualRatio*2) };
 
     Vector2 origin = { 0.0f, 0.0f };
 
     float rotation = 0.0f;
-    float degreesPerSecond = 60.0f;
 
     float cameraX = 0.0f;
     float cameraY = 0.0f;
@@ -61,16 +61,16 @@ int main(void)
     {
         // Update
         //----------------------------------------------------------------------------------
-        rotation += degreesPerSecond*GetFrameTime(); // Rotate the rectangles.
+        rotation += 60.0f*GetFrameTime();   // Rotate the rectangles, 60 degrees per second
 
-        // Make the camera move to demonstrate the effect.
+        // Make the camera move to demonstrate the effect
         cameraX = (sinf(GetTime())*50.0f) - 10.0f;
         cameraY = cosf(GetTime())*30.0f;
 
-        // Set the camera's target to the values computed above.
+        // Set the camera's target to the values computed above
         screenSpaceCamera.target = (Vector2){ cameraX, cameraY };
 
-        //Round worldSpace coordinates, keep decimals into screenSpace coordinates.
+        // Round worldSpace coordinates, keep decimals into screenSpace coordinates
         worldSpaceCamera.target.x = (int)screenSpaceCamera.target.x;
         screenSpaceCamera.target.x -= worldSpaceCamera.target.x;
         screenSpaceCamera.target.x *= virtualRatio;
@@ -83,47 +83,35 @@ int main(void)
 
         // Draw
         //----------------------------------------------------------------------------------
-        BeginDrawing();
-        ClearBackground(RED); // This is for debug purposes. If you see red, then you've probably done something wrong.
-
-        BeginTextureMode(renderTexture);
-        BeginMode2D(worldSpaceCamera);
-        ClearBackground(RAYWHITE); // This is the color you should see as background color.
-
-        // Draw the rectangles
-        DrawRectanglePro(firstRectangle, origin, rotation, BLACK);
-        DrawRectanglePro(secondRectangle, origin, -rotation, RED);
-        DrawRectanglePro(thirdRectangle, origin, rotation + 45.0f, BLUE);
-
-        EndMode2D();
+        BeginTextureMode(target);
+            ClearBackground(RAYWHITE);
+            
+            BeginMode2D(worldSpaceCamera);
+                DrawRectanglePro(rec01, origin, rotation, BLACK);
+                DrawRectanglePro(rec02, origin, -rotation, RED);
+                DrawRectanglePro(rec03, origin, rotation + 45.0f, BLUE);
+            EndMode2D();
         EndTextureMode();
+            
+        BeginDrawing();
+            ClearBackground(RED);
 
-        BeginMode2D(screenSpaceCamera);
-
-        // Draw the render texture with an offset of 1 worldSpace unit/pixel, so that the content behind the renderTexture is not shown.
-        DrawTexturePro(
-            renderTexture.texture,
-            renderTextureSource,
-            renderTextureDest,
-            origin,
-            0.0f,
-            WHITE
-        );
-
-        EndMode2D();
+            BeginMode2D(screenSpaceCamera);
+                DrawTexturePro(target.texture, sourceRec, destRec, origin, 0.0f, WHITE);
+            EndMode2D();
 
-        //Debug info
-        DrawText("Screen resolution: 800x450", 5, 0, 20, DARKBLUE);
-        DrawText("World resolution: 160x90", 5, 20, 20, DARKGREEN);
-        DrawFPS(screenWidth - 75, 0);
+            DrawText(TextFormat("Screen resolution: %ix%i", screenWidth, screenHeight), 10, 10, 20, DARKBLUE);
+            DrawText(TextFormat("World resolution: %ix%i", virtualScreenWidth, virtualScreenHeight), 10, 40, 20, DARKGREEN);
+            DrawFPS(GetScreenWidth() - 95, 10);
         EndDrawing();
         //----------------------------------------------------------------------------------
     }
 
     // De-Initialization
     //--------------------------------------------------------------------------------------
-    UnloadRenderTexture(renderTexture); // RenderTexture unloading
-    CloseWindow();        // Close window and OpenGL context
+    UnloadRenderTexture(target);    // Unload render texture
+    
+    CloseWindow();                  // Close window and OpenGL context
     //--------------------------------------------------------------------------------------
 
     return 0;