Updated example to new render to texture system

examples/shaders_custom_uniform.c

@@ -47,7 +47,11 @@ int main()
     
     float swirlCenter[2] = { (float)screenWidth/2, (float)screenHeight/2 };
     
-    SetPostproShader(shader);               // Set fullscreen postprocessing shader
+    // NOTE: Old postprocessing system is not flexible enough despite being very easy to use
+    //SetPostproShader(shader);               // Set fullscreen postprocessing shader
+    
+    // New postprocessing system let the user create multiple RenderTexture2D and perform multiple render passes
+    RenderTexture2D target = LoadRenderTexture(screenWidth, screenHeight);
     
     // Setup orbital camera
     SetCameraMode(CAMERA_ORBITAL);          // Set an orbital camera mode
@@ -79,6 +83,8 @@ int main()
 
             ClearBackground(RAYWHITE);
             
+            BeginTextureMode(target);   // Enable render to texture RenderTexture2D
+
                 Begin3dMode(camera);
 
                     DrawModel(dwarf, position, 2.0f, WHITE);   // Draw 3d model with texture
@@ -87,6 +93,13 @@ int main()
 
                 End3dMode();
             
+            EndTextureMode();           // End drawing to texture (now we have a texture available for next passes)
+            
+            SetCustomShader(shader);
+            // NOTE: Render texture must be y-flipped due to default OpenGL coordinates (left-bottom)
+            DrawTextureRec(target.texture, (Rectangle){ 0, target.texture.height, target.texture.width, -target.texture.height }, (Vector2){ 0, 0 }, WHITE);
+            SetDefaultShader();
+            
             DrawText("(c) Dwarf 3D model by David Moreno", screenWidth - 200, screenHeight - 20, 10, GRAY);
 
             DrawFPS(10, 10);
@@ -100,6 +113,7 @@ int main()
     UnloadShader(shader);           // Unload shader
     UnloadTexture(texture);         // Unload texture
     UnloadModel(dwarf);             // Unload model
+    UnloadRenderTexture(target);    // Unload render texture
 
     CloseWindow();                  // Close window and OpenGL context
     //--------------------------------------------------------------------------------------