ADDED: `rlBlitFramebuffer()`, required for deferred render

src/rlgl.h

@@ -617,6 +617,7 @@ RLAPI void rlDisableShader(void);                       // Disable shader progra
 RLAPI void rlEnableFramebuffer(unsigned int id);        // Enable render texture (fbo)
 RLAPI void rlDisableFramebuffer(void);                  // Disable render texture (fbo), return to default framebuffer
 RLAPI void rlActiveDrawBuffers(int count);              // Activate multiple draw color buffers
+RLAPI void rlBlitFramebuffer(int srcX, int srcY, int srcWidth, int srcHeight, int dstX, int dstY, int dstWidth, int dstHeight, int bufferMask); // Blit active framebuffer to main framebuffer
 
 // General render state
 RLAPI void rlEnableColorBlend(void);                     // Enable color blending
@@ -1713,6 +1714,14 @@ void rlDisableFramebuffer(void)
 #endif
 }
 
+// Blit active framebuffer to main framebuffer
+void rlBlitFramebuffer(int srcX, int srcY, int srcWidth, int srcHeight, int dstX, int dstY, int dstWidth, int dstHeight, int bufferMask)
+{
+#if (defined(GRAPHICS_API_OPENGL_33) || defined(GRAPHICS_API_OPENGL_ES3)) && defined(RLGL_RENDER_TEXTURES_HINT)
+    glBlitFramebuffer(srcX, srcY, srcWidth, srcHeight, dstX, dstY, dstWidth, dstHeight, bufferMask, GL_NEAREST);
+#endif
+}
+
 // Activate multiple draw color buffers
 // NOTE: One color buffer is always active by default
 void rlActiveDrawBuffers(int count)