Review RenderTexture drawing usage

Now `BeginTextureMode()` does not clean buffers automatically, that behaviour has been changed because there could be some case (i.e. painting software) where texture buffer does not ned to be cleared; user is responsible of clearing buffers using `ClearBackground()`

examples/shaders/shaders_custom_uniform.c

@@ -85,13 +85,15 @@ int main()
             
             BeginTextureMode(target);       // Enable drawing to texture
             
-                BeginMode3D(camera);
+                ClearBackground(RAYWHITE);  // Clear texture background
+
+                BeginMode3D(camera);        // Begin 3d mode drawing
 
                     DrawModel(model, position, 0.5f, WHITE);   // Draw 3d model with texture
 
                     DrawGrid(10, 1.0f);     // Draw a grid
 
-                EndMode3D();
+                EndMode3D();                // End 3d mode drawing, returns to orthographic 2d mode
                 
                 DrawText("TEXT DRAWN IN RENDER TEXTURE", 200, 10, 30, RED);
             
@@ -104,6 +106,7 @@ int main()
             
             EndShaderMode();
             
+            // Draw some 2d text over drawn texture
             DrawText("(c) Barracks 3D model by Alberto Cano", screenWidth - 220, screenHeight - 20, 10, GRAY);
             
             DrawFPS(10, 10);

examples/shaders/shaders_postprocessing.c

@@ -130,13 +130,15 @@ int main()
 
             BeginTextureMode(target);       // Enable drawing to texture
             
-                BeginMode3D(camera);
+                ClearBackground(RAYWHITE);  // Clear texture background
+
+                BeginMode3D(camera);        // Begin 3d mode drawing
 
                     DrawModel(model, position, 0.1f, WHITE);   // Draw 3d model with texture
 
                     DrawGrid(10, 1.0f);     // Draw a grid
 
-                EndMode3D();
+                EndMode3D();                // End 3d mode drawing, returns to orthographic 2d mode
                 
             EndTextureMode();               // End drawing to texture (now we have a texture available for next passes)
             
@@ -148,6 +150,7 @@ int main()
                 
             EndShaderMode();
             
+            // Draw 2d shapes and text over drawn texture
             DrawRectangle(0, 9, 580, 30, Fade(LIGHTGRAY, 0.7f));
             
             DrawText("(c) Church 3D model by Alberto Cano", screenWidth - 200, screenHeight - 20, 10, GRAY);

games/wave_collector/screens/screen_gameplay.c

@@ -430,8 +430,8 @@ void DrawGameplayScreen(void)
     else
     {
         // Draw wave using render target
-        ClearBackground(BLANK);
         BeginTextureMode(waveTarget);
+            ClearBackground(BLANK);
             DrawSamplesMap(samples, totalSamples, currentSample, (Rectangle){ 0, 0, waveTarget.texture.width, waveTarget.texture.height }, MAROON);
         EndTextureMode();
 

src/core.c

@@ -1173,10 +1173,6 @@ void BeginTextureMode(RenderTexture2D target)
 
     rlEnableRenderTexture(target.id);   // Enable render target
 
-    // Some projects need the buffer to not be empited when drawing to
-    // the render texture.
-    //rlClearScreenBuffers();             // Clear render texture buffers
-
     // Set viewport to framebuffer size
     rlViewport(0, 0, target.texture.width, target.texture.height);