Reviewed for standalone usage

Requires raymath as standalone and GLEW

src/rlgl.c

@@ -33,20 +33,21 @@
 #include <string.h>         // Declares strcmp(), strlen(), strtok()
 
 #if defined(GRAPHICS_API_OPENGL_11)
-    #ifdef __APPLE__            // OpenGL include for OSX
+    #ifdef __APPLE__                // OpenGL include for OSX
         #include <OpenGL/gl.h>
     #else
-        #include <GL/gl.h>      // Basic OpenGL include
+        #include <GL/gl.h>          // Basic OpenGL include
     #endif
 #endif
 
 #if defined(GRAPHICS_API_OPENGL_33)
     #define GLEW_STATIC
-    #ifdef __APPLE__            // OpenGL include for OSX
+    #ifdef __APPLE__                // OpenGL include for OSX
         #include <OpenGL/gl3.h>
     #else
-        #include <GL/glew.h>    // Extensions loading lib
-        //#include "glad.h"     // TODO: Other extensions loading lib? --> REVIEW
+        #include <GL/glew.h>        // Extensions loading lib
+        //#include "glad.h"         // TODO: Test glad extensions loading lib
+        //#include "gl_core_3_3.h"  // TODO: Test glLoadGen extension loading lib: ERRORS
     #endif
 #endif
 
@@ -56,6 +57,10 @@
     #include <GLES2/gl2ext.h>
 #endif
 
+#if defined(RLGL_STANDALONE)
+    #include <stdarg.h>         // Used for functions with variable number of parameters (TraceLog())
+#endif
+
 //----------------------------------------------------------------------------------
 // Defines and Macros
 //----------------------------------------------------------------------------------
@@ -177,6 +182,10 @@ typedef struct {
     unsigned char a;
 } pixel;
 
+#if defined(RLGL_STANDALONE)
+typedef enum { INFO = 0, ERROR, WARNING, DEBUG, OTHER } TraceLogType;
+#endif
+
 //----------------------------------------------------------------------------------
 // Global Variables Definition
 //----------------------------------------------------------------------------------
@@ -250,6 +259,9 @@ static PFNGLDELETEVERTEXARRAYSOESPROC glDeleteVertexArrays;
 // NOTE: It's required in shapes and models modules!
 unsigned int whiteTexture;
 
+// Save screen size data (render size), required for postpro quad
+static int screenWidth, screenHeight;
+
 //----------------------------------------------------------------------------------
 // Module specific Functions Declaration
 //----------------------------------------------------------------------------------
@@ -273,6 +285,10 @@ static pixel *GenNextMipmap(pixel *srcData, int srcWidth, int srcHeight);
 static char** StringSplit(char *baseString, const char delimiter, int *numExt);
 #endif
 
+#if defined(RLGL_STANDALONE)
+static void TraceLog(int msgType, const char *text, ...);
+#endif
+
 //----------------------------------------------------------------------------------
 // Module Functions Definition - Matrix operations
 //----------------------------------------------------------------------------------
@@ -846,12 +862,12 @@ void rlglInit(void)
 #if defined(GRAPHICS_API_OPENGL_33)
     // Initialize extensions using GLEW
     glewExperimental = 1;       // Needed for core profile
-    
     GLenum error = glewInit();
     
     if (error != GLEW_OK) TraceLog(ERROR, "Failed to initialize GLEW - Error Code: %s\n", glewGetErrorString(error));
-
+    
     if (glewIsSupported("GL_VERSION_3_3"))
+    //if (ogl_LoadFunctions() != ogl_LOAD_FAILED)
     {
         TraceLog(INFO, "OpenGL 3.3 Core profile");
         
@@ -995,6 +1011,7 @@ void rlglInit(void)
 }
 
 // Init postpro system
+// NOTE: Uses global variables screenWidth and screenHeight
 void rlglInitPostpro(void)
 {
 #if defined(GRAPHICS_API_OPENGL_33) || defined(GRAPHICS_API_OPENGL_ES2)
@@ -1005,13 +1022,13 @@ void rlglInitPostpro(void)
     glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
     glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
     glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
-    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, GetScreenWidth(), GetScreenHeight(), 0, GL_RGB, GL_UNSIGNED_BYTE, NULL);
+    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, screenWidth, screenHeight, 0, GL_RGB, GL_UNSIGNED_BYTE, NULL);
     glBindTexture(GL_TEXTURE_2D, 0);
 
     // Create the renderbuffer that will serve as the depth attachment for the framebuffer.
     glGenRenderbuffers(1, &fboDepthTexture);
     glBindRenderbuffer(GL_RENDERBUFFER, fboDepthTexture);
-    glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH_COMPONENT16, GetScreenWidth(), GetScreenHeight());
+    glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH_COMPONENT16, screenWidth, screenHeight);
     
     // NOTE: We can also use a texture for depth buffer (GL_ARB_depth_texture/GL_OES_depth_texture extensions)
     // A renderbuffer is simpler than a texture and could offer better performance on embedded devices
@@ -1062,8 +1079,8 @@ void rlglInitPostpro(void)
         
         quadData.vertexCount = 6;
         
-        float w = GetScreenWidth();
-        float h = GetScreenHeight();
+        float w = screenWidth;
+        float h = screenHeight;
         
         float quadPositions[6*3] = { w, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, h, 0.0, 0, h, 0.0, w, h, 0.0, w, 0.0, 0.0 }; 
         float quadTexcoords[6*2] = { 1.0, 1.0, 0.0, 1.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0, 1.0, 1.0 };
@@ -1141,7 +1158,20 @@ void rlglClose(void)
     {
         glDeleteFramebuffers(1, &fbo);
         
-        UnloadModel(postproQuad);
+        // Unload postpro quad model data
+#if defined(GRAPHICS_API_OPENGL_11)
+        free(postproQuad.mesh.vertices);
+        free(postproQuad.mesh.texcoords);
+        free(postproQuad.mesh.normals);
+#endif
+
+        rlDeleteBuffers(postproQuad.mesh.vboId[0]);
+        rlDeleteBuffers(postproQuad.mesh.vboId[1]);
+        rlDeleteBuffers(postproQuad.mesh.vboId[2]);
+
+        rlDeleteVertexArrays(postproQuad.mesh.vaoId);
+        
+        TraceLog(INFO, "Unloaded postpro quad data");
     }
 
     free(draws);
@@ -1312,7 +1342,7 @@ void rlglDrawPostpro(void)
 #if defined(GRAPHICS_API_OPENGL_33) || defined(GRAPHICS_API_OPENGL_ES2)
     glBindFramebuffer(GL_FRAMEBUFFER, 0);
 
-    rlglDrawModel(postproQuad, (Vector3){0,0,0}, 0.0f, (Vector3){0,0,0}, (Vector3){1.0f, 1.0f, 1.0f}, WHITE, false);
+    rlglDrawModel(postproQuad, (Vector3){0,0,0}, 0.0f, (Vector3){0,0,0}, (Vector3){1.0f, 1.0f, 1.0f}, (Color){ 255, 255, 255, 255 }, false);
 #endif
 }
 
@@ -1459,17 +1489,23 @@ void rlglDrawModel(Model model, Vector3 position, float rotationAngle, Vector3 r
 }
 
 // Initialize Graphics Device (OpenGL stuff)
+// NOTE: Stores global variables screenWidth and screenHeight
 void rlglInitGraphics(int offsetX, int offsetY, int width, int height)
 {
+    // Save screen size data (global vars), required on postpro quad
+    // NOTE: Size represents render size, it could differ from screen size!
+    screenWidth = width;
+    screenHeight = height;
+    
     // NOTE: Required! viewport must be recalculated if screen resized!
     glViewport(offsetX/2, offsetY/2, width - offsetX, height - offsetY);    // Set viewport width and height
 
     // NOTE: Don't confuse glViewport with the transformation matrix
     // NOTE: glViewport just defines the area of the context that you will actually draw to.
 
-    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);     // Clear used buffers, depth buffer is used for 3D
     glClearColor(0.0f, 0.0f, 0.0f, 1.0f);                   // Set background color (black)
     //glClearDepth(1.0f);                                   // Clear depth buffer (default)
+    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);     // Clear used buffers, depth buffer is used for 3D
 
     glEnable(GL_DEPTH_TEST);                                // Enables depth testing (required for 3D)
     glDepthFunc(GL_LEQUAL);                                 // Type of depth testing to apply
@@ -2216,6 +2252,8 @@ unsigned int LoadShaderProgram(char *vShaderStr, char *fShaderStr)
 void UnloadShader(Shader shader)
 {
     rlDeleteShader(shader.id);
+    
+    TraceLog(INFO, "[SHDR ID %i] Unloaded shader program data", shader.id);
 }
 
 // Set custom shader to be used on batch draw
@@ -2252,6 +2290,7 @@ void SetCustomShader(Shader shader)
 }
 
 // Set postprocessing shader
+// NOTE: Uses global variables screenWidth and screenHeight
 void SetPostproShader(Shader shader)
 {
 #if defined(GRAPHICS_API_OPENGL_33) || defined(GRAPHICS_API_OPENGL_ES2)
@@ -2265,8 +2304,8 @@ void SetPostproShader(Shader shader)
     
     Texture2D texture;
     texture.id = fboColorTexture;
-    texture.width = GetScreenWidth();
-    texture.height = GetScreenHeight();
+    texture.width = screenWidth;
+    texture.height = screenHeight;
 
     SetShaderMapDiffuse(&postproQuad.shader, texture);
     
@@ -3072,12 +3111,9 @@ static pixel *GenNextMipmap(pixel *srcData, int srcWidth, int srcHeight)
 #endif
 
 #if defined(RLGL_STANDALONE)
-
-typedef enum { INFO = 0, ERROR, WARNING, DEBUG, OTHER } TraceLogType;
-
 // Output a trace log message
 // NOTE: Expected msgType: (0)Info, (1)Error, (2)Warning
-void TraceLog(int msgType, const char *text, ...)
+static void TraceLog(int msgType, const char *text, ...)
 {
     va_list args;
     va_start(args, text);

src/rlgl.h

@@ -36,6 +36,10 @@
     #include "utils.h"          // Required for function TraceLog()
 #endif
 
+#if defined(RLGL_STANDALONE)
+    #define RAYMATH_STANDALONE
+#endif
+
 #include "raymath.h"            // Required for data type Matrix and Matrix functions
 
 // Select desired OpenGL version
@@ -89,9 +93,26 @@ typedef enum { RL_LINES, RL_TRIANGLES, RL_QUADS } DrawMode;
 typedef enum { OPENGL_11 = 1, OPENGL_33, OPENGL_ES_20 } GlVersion;
 
 #ifdef RLGL_STANDALONE
+    #ifndef __cplusplus
+    // Boolean type
+    typedef enum { false, true } bool;
+    #endif
+
+    // byte type
+    typedef unsigned char byte;
+    
+    // Color type, RGBA (32bit)
+    typedef struct Color {
+        unsigned char r;
+        unsigned char g;
+        unsigned char b;
+        unsigned char a;
+    } Color;
+
     // Texture formats (support depends on OpenGL version)
     typedef enum { 
         UNCOMPRESSED_GRAYSCALE = 1,     // 8 bit per pixel (no alpha)
+        UNCOMPRESSED_GRAY_ALPHA,
         UNCOMPRESSED_R5G6B5,            // 16 bpp
         UNCOMPRESSED_R8G8B8,            // 24 bpp
         UNCOMPRESSED_R5G5B5A1,          // 16 bpp (1 bit alpha)
@@ -106,7 +127,8 @@ typedef enum { OPENGL_11 = 1, OPENGL_33, OPENGL_ES_20 } GlVersion;
         COMPRESSED_ETC2_EAC_RGBA,       // 8 bpp
         COMPRESSED_PVRT_RGB,            // 4 bpp
         COMPRESSED_PVRT_RGBA,           // 4 bpp
-        /*COMPRESSED_ASTC_RGBA_4x4*/    // 8 bpp
+        COMPRESSED_ASTC_4x4_RGBA,       // 8 bpp
+        COMPRESSED_ASTC_8x8_RGBA        // 2 bpp
     } TextureFormat;
 
     // VertexData type
@@ -123,21 +145,36 @@ typedef enum { OPENGL_11 = 1, OPENGL_33, OPENGL_ES_20 } GlVersion;
 
     // Shader type
     typedef struct Shader {
-        unsigned int id;            // Shader program id
+        unsigned int id;                // Shader program id
 
+        // TODO: This should be Texture2D objects
+        unsigned int texDiffuseId;      // Diffuse texture id
+        unsigned int texNormalId;       // Normal texture id
+        unsigned int texSpecularId;     // Specular texture id
+        
         // Variable attributes
-        unsigned int vertexLoc;     // Vertex attribute location point (vertex shader)
-        unsigned int texcoordLoc;   // Texcoord attribute location point (vertex shader)
-        unsigned int normalLoc;     // Normal attribute location point (vertex shader)
-        unsigned int colorLoc;      // Color attibute location point (vertex shader)
+        int vertexLoc;        // Vertex attribute location point (vertex shader)
+        int texcoordLoc;      // Texcoord attribute location point (vertex shader)
+        int normalLoc;        // Normal attribute location point (vertex shader)
+        int colorLoc;         // Color attibute location point (vertex shader)
 
         // Uniforms
-        unsigned int projectionLoc; // Projection matrix uniform location point (vertex shader)
-        unsigned int modelviewLoc;  // ModeView matrix uniform location point (vertex shader)
-        unsigned int textureLoc;    // Texture uniform location point (fragment shader)
-        unsigned int tintColorLoc;  // Color uniform location point (fragment shader)
+        int projectionLoc;    // Projection matrix uniform location point (vertex shader)
+        int modelviewLoc;     // ModeView matrix uniform location point (vertex shader)
+        int tintColorLoc;     // Color uniform location point (fragment shader)
+        
+        int mapDiffuseLoc;    // Diffuse map texture uniform location point (fragment shader)
+        int mapNormalLoc;     // Normal map texture uniform location point (fragment shader)
+        int mapSpecularLoc;   // Specular map texture uniform location point (fragment shader)
     } Shader;
 
+    // Texture2D type
+    typedef struct Texture2D {
+        unsigned int id;            // Texture id
+        int width;
+        int height;
+    } Texture2D;
+    
     // 3d Model type
     typedef struct Model {
         VertexData mesh;
@@ -145,13 +182,6 @@ typedef enum { OPENGL_11 = 1, OPENGL_33, OPENGL_ES_20 } GlVersion;
         Texture2D texture;
         Shader shader;
     } Model;
-
-    // Texture2D type
-    typedef struct Texture2D {
-        unsigned int id;            // Texture id
-        int width;
-        int height;
-    } Texture2D;
 #endif
 
 #ifdef __cplusplus
@@ -231,6 +261,29 @@ void PrintProjectionMatrix(void);       // DEBUG: Print projection matrix
 void PrintModelviewMatrix(void);        // DEBUG: Print modelview matrix
 #endif
 
+#if defined(RLGL_STANDALONE)
+//------------------------------------------------------------------------------------
+// Shaders System Functions (Module: rlgl)
+// NOTE: This functions are useless when using OpenGL 1.1
+//------------------------------------------------------------------------------------
+Shader LoadShader(char *vsFileName, char *fsFileName);              // Load a custom shader and bind default locations
+unsigned int LoadShaderProgram(char *vShaderStr, char *fShaderStr); // Load a custom shader and return program id
+void UnloadShader(Shader shader);                                   // Unload a custom shader from memory
+void SetPostproShader(Shader shader);                               // Set fullscreen postproduction shader
+void SetCustomShader(Shader shader);                                // Set custom shader to be used in batch draw
+void SetDefaultShader(void);                                        // Set default shader to be used in batch draw
+void SetModelShader(Model *model, Shader shader);                   // Link a shader to a model
+bool IsPosproShaderEnabled(void);                                   // Check if postprocessing shader is enabled
+
+int GetShaderLocation(Shader shader, const char *uniformName);                          // Get shader uniform location
+void SetShaderValue(Shader shader, int uniformLoc, float *value, int size);             // Set shader uniform value (float)
+void SetShaderValuei(Shader shader, int uniformLoc, int *value, int size);              // Set shader uniform value (int)
+void SetShaderMapDiffuse(Shader *shader, Texture2D texture);                            // Default diffuse shader map texture assignment
+void SetShaderMapNormal(Shader *shader, const char *uniformName, Texture2D texture);    // Normal map texture shader assignment
+void SetShaderMapSpecular(Shader *shader, const char *uniformName, Texture2D texture);  // Specular map texture shader assignment
+void SetShaderMap(Shader *shader, int mapLocation, Texture2D texture, int textureUnit); // TODO: Generic shader map assignment
+#endif
+
 #ifdef __cplusplus
 }
 #endif