Add multiple color buffer attachments points to gl::Framebuffer.

src/libGLESv2/Framebuffer.h

@@ -34,6 +34,7 @@ class Framebuffer
 
     virtual ~Framebuffer();
 
+    void setColorbuffer(unsigned int colorAttachment, GLenum type, GLuint colorbuffer);
     void setColorbuffer(GLenum type, GLuint colorbuffer);
     void setDepthbuffer(GLenum type, GLuint depthbuffer);
     void setStencilbuffer(GLenum type, GLuint stencilbuffer);
@@ -41,31 +42,42 @@ class Framebuffer
     void detachTexture(GLuint texture);
     void detachRenderbuffer(GLuint renderbuffer);
 
+    unsigned int getRenderTargetSerial(unsigned int colorAttachment) const;
     unsigned int getRenderTargetSerial() const;
     unsigned int getDepthbufferSerial() const;
     unsigned int getStencilbufferSerial() const;
 
+    Renderbuffer *getColorbuffer(unsigned int colorAttachment) const;
     Renderbuffer *getColorbuffer() const;
     Renderbuffer *getDepthbuffer() const;
     Renderbuffer *getStencilbuffer() const;
     Renderbuffer *getDepthOrStencilbuffer() const;
+    Renderbuffer *getReadColorbuffer() const;
+    Renderbuffer *getFirstColorBuffer() const;
 
+    GLenum getColorbufferType(unsigned int colorAttachment) const;
     GLenum getColorbufferType() const;
     GLenum getDepthbufferType() const;
     GLenum getStencilbufferType() const;
 
+    GLuint getColorbufferHandle(unsigned int colorAttachment) const;
     GLuint getColorbufferHandle() const;
     GLuint getDepthbufferHandle() const;
     GLuint getStencilbufferHandle() const;
 
+    GLenum getDrawBufferState(unsigned int colorAttachment) const;
+    void setDrawBufferState(unsigned int colorAttachment, GLenum drawBuffer);
+
     bool hasStencil() const;
     int getSamples() const;
 
     virtual GLenum completeness() const;
 
   protected:
-    GLenum mColorbufferType;
-    BindingPointer<Renderbuffer> mColorbufferPointer;
+    GLenum mColorbufferTypes[IMPLEMENTATION_MAX_DRAW_BUFFERS];
+    BindingPointer<Renderbuffer> mColorbufferPointers[IMPLEMENTATION_MAX_DRAW_BUFFERS];
+    GLenum mDrawBufferStates[IMPLEMENTATION_MAX_DRAW_BUFFERS];
+    GLenum mReadBufferState;
 
     GLenum mDepthbufferType;
     BindingPointer<Renderbuffer> mDepthbufferPointer;

src/libGLESv2/constants.h

@@ -23,7 +23,8 @@ enum
     IMPLEMENTATION_MAX_VERTEX_TEXTURE_IMAGE_UNITS = 16,
     IMPLEMENTATION_MAX_COMBINED_TEXTURE_IMAGE_UNITS = MAX_TEXTURE_IMAGE_UNITS + IMPLEMENTATION_MAX_VERTEX_TEXTURE_IMAGE_UNITS,    
 
-    IMPLEMENTATION_MAX_VARYING_VECTORS = 32
+    IMPLEMENTATION_MAX_VARYING_VECTORS = 32,
+    IMPLEMENTATION_MAX_DRAW_BUFFERS = 8
 };
 
 const float ALIASED_LINE_WIDTH_RANGE_MIN = 1.0f;

src/libGLESv2/renderer/Renderer11.cpp

@@ -2359,6 +2359,9 @@ int Renderer11::getNearestSupportedSamples(DXGI_FORMAT format, unsigned int requ
 
 unsigned int Renderer11::getMaxRenderTargets() const
 {
+    META_ASSERT(D3D11_SIMULTANEOUS_RENDER_TARGET_COUNT <= gl::IMPLEMENTATION_MAX_DRAW_BUFFERS);
+    META_ASSERT(D3D10_SIMULTANEOUS_RENDER_TARGET_COUNT <= gl::IMPLEMENTATION_MAX_DRAW_BUFFERS);
+
     switch (mFeatureLevel)
     {
       case D3D_FEATURE_LEVEL_11_0: