source: GTP/trunk/App/Demos/Vis/FriendlyCulling/src/RenderState.h @ 3031

#ifndef __RENDERSTATE_H
#define __RENDERSTATE_H


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


namespace CHCDemoEngine 
{

class ShaderProgram;
class Texture;

/** The current render state.
*/
class RenderState
{
public:

        enum Mode
        {
                QUERY,
                RENDER
        };

        /// the used render type for this render pass
        enum RenderPassType
        {
                FIXED,
                DEPTH_PASS,
                DEFERRED
        };

        /** Constructor setting render as default state.
        */
        RenderState();
        
        ~RenderState() { Reset(); };
        /** This must be called each time before and after an occlusion test.
                Mode is one of render mode or query mode. Returns true if a state
                change was issued.
        */
        bool SetMode(Mode mode);
        /** Sets the current render state.
        */
        void SetState(Texture *tex, bool alphaTest, bool cullFace);
        /** Returns either query or render mode
        */
        inline Mode GetMode() const { return mMode; }
        /** Reset the state.
        */
        void Reset();
        /** Stores the current vbo id.
        */
        inline void SetCurrentVboId(int id) { mCurrentVboId = id; }
        /** Returns the current vbo id.
        */
        inline int GetCurrentVboId() const { return mCurrentVboId; }
        /** If alpha to coverage is instead of alpha testing
        */
        void SetUseAlphaToCoverage(bool useAlphaToCoverage);
        /** Sets the type of rendering used (foreward, depth pass, deferred)
        */
        void SetRenderPassType(RenderPassType t);
        /** See Set
        */
        RenderPassType GetRenderPassType() const;
        /** If true, the current value of cull face enabled / disable will
                not be changed by the render state.
        */
        void LockCullFaceEnabled(bool lockCull);
        /** Set a new texture.
        */
        void SetTexture(Texture *tex);


        ///////////////////
        //-- for deferred shading, we have to switch shaders on and off

        static CGprofile sCgFragmentProfile;
        static CGprofile sCgVertexProfile; 

        static ShaderProgram *sCgMrtFragmentProgram;
        static ShaderProgram *sCgMrtFragmentTexProgram;
        static ShaderProgram *sCgMrtVertexProgram;

        static int sTexParam;


protected:

        bool mAlphaTestEnabled;
        bool mCullFaceEnabled;
        bool mTexturesEnabled;

        Mode mMode;

        int mCurrentVboId;

        RenderPassType mRenderType;

        bool mUseAlphaToCoverage;

        bool mLockCullFaceEnabled;
};


}

#endif // __RENDERSTATE_H