Add stubs for missing virtual method implementations.

src/libGLESv2/renderer/Renderer11.cpp

@@ -436,4 +436,18 @@ int Renderer11::getMaxSupportedSamples() const
     return 1;
 }
 
+bool Renderer11::copyToRenderTarget(gl::TextureStorage2D *dest, gl::TextureStorage2D *source)
+{
+    // TODO
+    UNIMPLEMENTED();
+    return false;
+}
+
+bool Renderer11::copyToRenderTarget(gl::TextureStorageCubeMap *dest, gl::TextureStorageCubeMap *source)
+{
+    // TODO
+    UNIMPLEMENTED();
+    return false;
+}
+
 }
\ No newline at end of file

src/libGLESv2/renderer/Renderer11.h

@@ -83,6 +83,9 @@ class Renderer11 : public Renderer
 
     virtual GLsizei getMaxSupportedSamples() const;
 
+    virtual bool copyToRenderTarget(gl::TextureStorage2D *dest, gl::TextureStorage2D *source);
+    virtual bool copyToRenderTarget(gl::TextureStorageCubeMap *dest, gl::TextureStorageCubeMap *source);
+
     // D3D11-renderer specific methods
     ID3D11Device *getDevice() { return mDevice; }
     ID3D11DeviceContext *getDeviceContext() { return mDeviceContext; };