update rlgl.h

src/rlgl.h

@@ -159,7 +159,7 @@
 #endif
 
 // Security check in case multiple GRAPHICS_API_OPENGL_* defined
-#if defined(GRAPHICS_API_OPENGL_11)
+#if defined(GRAPHICS_API_OPENGL_11) || defined(GRAPHICS_API_OPENGL_11_SOFTWARE)
     #if defined(GRAPHICS_API_OPENGL_21)
         #undef GRAPHICS_API_OPENGL_21
     #endif
@@ -174,6 +174,11 @@
     #endif
 #endif
 
+// Software implementation uses OpenGL 1.1 functionality
+#if defined(GRAPHICS_API_OPENGL_11_SOFTWARE)
+    #define GRAPHICS_API_OPENGL_11
+#endif
+
 // OpenGL 2.1 uses most of OpenGL 3.3 Core functionality
 // WARNING: Specific parts are checked with #if defines
 #if defined(GRAPHICS_API_OPENGL_21)
@@ -767,6 +772,10 @@ RLAPI unsigned int rlLoadFramebuffer(void);                               // Loa
 RLAPI void rlFramebufferAttach(unsigned int fboId, unsigned int texId, int attachType, int texType, int mipLevel); // Attach texture/renderbuffer to a framebuffer
 RLAPI bool rlFramebufferComplete(unsigned int id);                        // Verify framebuffer is complete
 RLAPI void rlUnloadFramebuffer(unsigned int id);                          // Delete framebuffer from GPU
+#if defined(GRAPHICS_API_OPENGL_11_SOFTWARE)
+RLAPI void* rlGetFramebuffer(int* width, int* height);
+RLAPI void rlResizeFramebuffer(int width, int height);
+#endif
 
 // Shaders management
 RLAPI unsigned int rlLoadShaderCode(const char *vsCode, const char *fsCode);    // Load shader from code strings
@@ -833,24 +842,29 @@ RLAPI void rlLoadDrawQuad(void);     // Load and draw a quad
 #endif
 
 #if defined(GRAPHICS_API_OPENGL_11)
-    #if defined(__APPLE__)
-        #include <OpenGL/gl.h>          // OpenGL 1.1 library for OSX
-        #include <OpenGL/glext.h>       // OpenGL extensions library
+    #if defined(GRAPHICS_API_OPENGL_11_SOFTWARE)
+        #define RLSW_IMPL
+        #include <rlsw.h>                   // OpenGL 1.1 software implementation
     #else
-        // APIENTRY for OpenGL function pointer declarations is required
-        #if !defined(APIENTRY)
-            #if defined(_WIN32)
-                #define APIENTRY __stdcall
-            #else
-                #define APIENTRY
+        #if defined(__APPLE__)
+            #include <OpenGL/gl.h>          // OpenGL 1.1 library for OSX
+            #include <OpenGL/glext.h>       // OpenGL extensions library
+        #else
+            // APIENTRY for OpenGL function pointer declarations is required
+            #if !defined(APIENTRY)
+                #if defined(_WIN32)
+                    #define APIENTRY __stdcall
+                #else
+                    #define APIENTRY
+                #endif
+            #endif
+            // WINGDIAPI definition. Some Windows OpenGL headers need it
+            #if !defined(WINGDIAPI) && defined(_WIN32)
+                #define WINGDIAPI __declspec(dllimport)
             #endif
-        #endif
-        // WINGDIAPI definition. Some Windows OpenGL headers need it
-        #if !defined(WINGDIAPI) && defined(_WIN32)
-            #define WINGDIAPI __declspec(dllimport)
-        #endif
 
-        #include <GL/gl.h>              // OpenGL 1.1 library
+            #include <GL/gl.h>              // OpenGL 1.1 library
+        #endif
     #endif
 #endif
 
@@ -2310,6 +2324,10 @@ void rlglInit(int width, int height)
     glShadeModel(GL_SMOOTH);                                // Smooth shading between vertex (vertex colors interpolation)
 #endif
 
+#if defined(GRAPHICS_API_OPENGL_11_SOFTWARE)
+    swInit(width, height);
+#endif
+
 #if defined(GRAPHICS_API_OPENGL_33) || defined(GRAPHICS_API_OPENGL_ES2)
     // Store screen size into global variables
     RLGL.State.framebufferWidth = width;
@@ -2336,6 +2354,10 @@ void rlglClose(void)
     glDeleteTextures(1, &RLGL.State.defaultTextureId); // Unload default texture
     TRACELOG(RL_LOG_INFO, "TEXTURE: [ID %i] Default texture unloaded successfully", RLGL.State.defaultTextureId);
 #endif
+
+#if defined(GRAPHICS_API_OPENGL_11_SOFTWARE)
+    swClose();
+#endif
 }
 
 // Load OpenGL extensions
@@ -3673,6 +3695,20 @@ void *rlReadTexturePixels(unsigned int id, int width, int height, int format)
     return pixels;
 }
 
+#if defined(GRAPHICS_API_OPENGL_11_SOFTWARE)
+
+void* rlGetFramebuffer(int* width, int* height)
+{
+    return swGetColorBuffer(&width, &height);
+}
+
+void rlResizeFramebuffer(int width, int height)
+{
+    swResizeFramebuffer(width, height);
+}
+
+#endif
+
 // Read screen pixel data (color buffer)
 unsigned char *rlReadScreenPixels(int width, int height)
 {