Move OpenGL extensions loading to rlgl

src/core.c

@@ -58,10 +58,6 @@
     #define PLATFORM_DESKTOP      // Enable PLATFORM_DESKTOP code-base
 #endif
 
-#if defined(PLATFORM_DESKTOP)
-    #include "external/glad.h"    // GLAD library: Manage OpenGL headers and extensions
-#endif
-
 #if defined(PLATFORM_OCULUS)
     #include "../examples/oculus_glfw_sample/OculusSDK/LibOVR/Include/OVR_CAPI_GL.h"    // Oculus SDK for OpenGL
 #endif
@@ -1747,19 +1743,9 @@ static void InitDisplay(int width, int height)
 #endif
 
 #if defined(PLATFORM_DESKTOP)
-    // Load OpenGL 3.3 extensions using GLAD
-    if (rlGetVersion() == OPENGL_33)
-    {
-        // NOTE: glad is generated and contains only required OpenGL 3.3 Core extensions
-        if (!gladLoadGLLoader((GLADloadproc)glfwGetProcAddress)) TraceLog(WARNING, "GLAD: Cannot load OpenGL extensions");
-        else TraceLog(INFO, "GLAD: OpenGL extensions loaded successfully");
-
-        if (GLAD_GL_VERSION_3_3) TraceLog(INFO, "OpenGL 3.3 Core profile supported");
-        else TraceLog(ERROR, "OpenGL 3.3 Core profile not supported");
-        
-        // With GLAD, we can check if an extension is supported using the GLAD_GL_xxx booleans
-        //if (GLAD_GL_ARB_vertex_array_object) // Use GL_ARB_vertex_array_object
-    }
+    // Load OpenGL 3.3 extensions
+    // NOTE: GLFW loader function is passed as parameter
+    rlglLoadExtensions(glfwGetProcAddress);
 #endif
     
     // Enables GPU v-sync, so frames are not limited to screen refresh rate (60Hz -> 60 FPS)

src/rlgl.c

@@ -872,6 +872,23 @@ int rlGetVersion(void)
 #endif
 }
 
+// Load OpenGL extensions
+// NOTE: External loader function could be passed as a pointer
+void rlglLoadExtensions(void *loader)
+{
+#if defined(GRAPHICS_API_OPENGL_33)
+    // NOTE: glad is generated and contains only required OpenGL 3.3 Core extensions
+    if (!gladLoadGLLoader((GLADloadproc)loader)) TraceLog(WARNING, "GLAD: Cannot load OpenGL extensions");
+    else TraceLog(INFO, "GLAD: OpenGL extensions loaded successfully");
+
+    if (GLAD_GL_VERSION_3_3) TraceLog(INFO, "OpenGL 3.3 Core profile supported");
+    else TraceLog(ERROR, "OpenGL 3.3 Core profile not supported");
+
+    // With GLAD, we can check if an extension is supported using the GLAD_GL_xxx booleans
+    //if (GLAD_GL_ARB_vertex_array_object) // Use GL_ARB_vertex_array_object
+#endif
+}
+
 //----------------------------------------------------------------------------------
 // Module Functions Definition - rlgl Functions
 //----------------------------------------------------------------------------------
@@ -1184,11 +1201,13 @@ unsigned int rlglLoadTexture(void *data, int width, int height, int textureForma
     GLuint id = 0;
     
     // Check texture format support by OpenGL 1.1 (compressed textures not supported)
-    if ((rlGetVersion() == OPENGL_11) && (textureFormat >= 8))
+#if defined(GRAPHICS_API_OPENGL_11) 
+    if (textureFormat >= 8)
     {
         TraceLog(WARNING, "OpenGL 1.1 does not support GPU compressed texture formats");
         return id;
     }
+#endif
     
     if ((!texCompDXTSupported) && ((textureFormat == COMPRESSED_DXT1_RGB) || (textureFormat == COMPRESSED_DXT1_RGBA) ||
         (textureFormat == COMPRESSED_DXT3_RGBA) || (textureFormat == COMPRESSED_DXT5_RGBA)))

src/rlgl.h

@@ -48,7 +48,7 @@
 
 // Choose opengl version here or just define it at compile time: -DGRAPHICS_API_OPENGL_33
 //#define GRAPHICS_API_OPENGL_11     // Only available on PLATFORM_DESKTOP
-//#define GRAPHICS_API_OPENGL_33     // Only available on PLATFORM_DESKTOP
+//#define GRAPHICS_API_OPENGL_33     // Only available on PLATFORM_DESKTOP or PLATFORM_OCULUS
 //#define GRAPHICS_API_OPENGL_ES2    // Only available on PLATFORM_ANDROID or PLATFORM_RPI or PLATFORM_WEB
 
 // Security check in case no GRAPHICS_API_OPENGL_* defined
@@ -296,6 +296,7 @@ void rlglInit(void);                            // Initialize rlgl (shaders, VAO
 void rlglClose(void);                           // De-init rlgl
 void rlglDraw(void);                            // Draw VAO/VBO
 void rlglInitGraphics(int offsetX, int offsetY, int width, int height);  // Initialize Graphics (OpenGL stuff)
+void rlglLoadExtensions(void *loader);          // Load OpenGL extensions
 
 unsigned int rlglLoadTexture(void *data, int width, int height, int textureFormat, int mipmapCount);    // Load texture in GPU
 RenderTexture2D rlglLoadRenderTexture(int width, int height);   // Load a texture to be used for rendering (fbo with color and depth attachments)