source: GTP/trunk/App/Demos/Vis/FriendlyCulling/src/DeferredShader.h @ 2894

#ifndef _DeferredShader_H__
#define _DeferredShader_H__

#include "common.h"
#include "glInterface.h"
#include <Cg/cg.h>
#include <Cg/cgGL.h>


namespace CHCDemoEngine 
{ 

class FrameBufferObject;
class ShadowMap;
class Matrix4x4;


/** This class implements a deferred shading algorithm that takes
        a frame buffer object as input and outputs an image in the given size
*/
class DeferredShader
{
public:
        /** constructor for a deferred shader taking the requested output image size
        */
        DeferredShader(int w, int h, float maxDepth);

        ~DeferredShader();
        /** The algorithm renders the scene given an fbo.
                The fbo must have color buffer, position buffer, normal buffer.
        */
        void Render(FrameBufferObject *fbo);

        /** Initialises the deferred shader and loads the required shaders:
                This function has to be called only once.
        */
        static void Init(CGcontext context);

        void Render(FrameBufferObject *fbo, ShadowMap *shadowMap);


protected:

        void FirstPass(FrameBufferObject *fbo);

        void FirstPassShadow(FrameBufferObject *fbo, ShadowMap *shadowMap);

        void AntiAliasing(FrameBufferObject *fbo);


        //////////////////

        int mWidth;
        int mHeight;

        float mScaleFactor;
};

} // namespace 
#endif // _DeferredShader_H__