RenderState.h

/* ScummVM - Graphic Adventure Engine
 *
 * ScummVM is the legal property of its developers, whose names
 * are too numerous to list here. Please refer to the COPYRIGHT
 * file distributed with this source distribution.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 */

/*
 * Copyright (C) 2006-2010 - Frictional Games
 *
 * This file is part of HPL1 Engine.
 */

#ifndef HPL_RENDER_SET_H
#define HPL_RENDER_SET_H

#include "hpl1/engine/graphics/GPUProgram.h"
#include "hpl1/engine/graphics/GraphicsTypes.h"
#include "hpl1/engine/graphics/Material.h"
#include "hpl1/engine/math/MathTypes.h"
#include "hpl1/engine/system/SystemTypes.h"

namespace hpl {

class cRenderSettings;
class iRenderable;
class iLight3D;
class cSector;

enum eRenderStateType {
    eRenderStateType_Sector = 0,
    eRenderStateType_Pass = 1,
    eRenderStateType_DepthTest = 2,
    eRenderStateType_Depth = 3,
    eRenderStateType_AlphaMode = 4,
    eRenderStateType_BlendMode = 5,
    eRenderStateType_VertexProgram = 6,
    eRenderStateType_FragmentProgram = 7,
    eRenderStateType_Texture = 8,
    eRenderStateType_VertexBuffer = 9,
    eRenderStateType_Matrix = 10,
    eRenderStateType_Render = 11,
    eRenderStateType_GpuProgram = 12,
    eRenderStateType_LastEnum = 13
};

class iRenderState {
public:
    iRenderState() {}

    int Compare(const iRenderState *apState) const;
    void SetMode(cRenderSettings *apSettings);

    void Set(const iRenderState *apState);

    eRenderStateType mType;

    // Properties:
    // Sector
    cSector *mpSector;

    // Pass
    int mlPass;

    // DepthTest
    bool mbDepthTest;

    // Depth:
    float mfZ;

    // Alpha
    eMaterialAlphaMode mAlphaMode;

    // Blend
    eMaterialBlendMode mBlendMode;
    eMaterialChannelMode mChannelMode;

    iGpuProgram *gpuProgram;
    iMaterialProgramSetup *gpuProgramSetup;

    // Vertex program
    iGpuProgram *mpVtxProgram;
    iMaterialProgramSetup *mpVtxProgramSetup;
    bool mbUsesLight;
    bool mbUsesEye;
    iLight3D *mpLight;

    // Fragment program
    iGpuProgram *mpFragProgram;
    iMaterialProgramSetup *mpFragProgramSetup;

    // Texture
    iTexture *mpTexture[MAX_TEXTUREUNITS];
    eMaterialBlendMode mTextureBlend[MAX_TEXTUREUNITS];

    // Vertex buffer
    iVertexBuffer *mpVtxBuffer;

    // Matrix
    cMatrixf *mpModelMatrix;
    cMatrixf *mpInvModelMatrix;

    // Scale
    cVector3f mvScale;

    // Render
    iRenderable *mpObject;

private:
    // Compare
    int CompareSector(const iRenderState *apState) const;
    int ComparePass(const iRenderState *apState) const;
    int CompareDepthTest(const iRenderState *apState) const;
    int CompareDepth(const iRenderState *apState) const;
    int CompareAlpha(const iRenderState *apState) const;
    int CompareBlend(const iRenderState *apState) const;
    int CompareVtxProg(const iRenderState *apState) const;
    int CompareFragProg(const iRenderState *apState) const;
    int CompareTexture(const iRenderState *apState) const;
    int CompareVtxBuff(const iRenderState *apState) const;
    int CompareMatrix(const iRenderState *apState) const;
    int CompareRender(const iRenderState *apState) const;
    int compareGpuProgram(const iRenderState *state) const;
    // Set mode
    void SetSectorMode(cRenderSettings *apSettings);
    void SetPassMode(cRenderSettings *apSettings);
    void SetDepthTestMode(cRenderSettings *apSettings);
    void SetDepthMode(cRenderSettings *apSettings);
    void SetBlendMode(cRenderSettings *apSettings);
    void SetAlphaMode(cRenderSettings *apSettings);
    void setGpuProgMode(cRenderSettings *settings);
    void SetTextureMode(cRenderSettings *apSettings);
    void SetVtxBuffMode(cRenderSettings *apSettings);
    void SetMatrixMode(cRenderSettings *apSettings);
    void SetRenderMode(cRenderSettings *apSettings);
};

} // namespace hpl

#endif // HPL_RENDER_SET_H