RendererPostEffects.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_RENDERER_POST_EFFECTS_H
#define HPL_RENDERER_POST_EFFECTS_H

#include "common/list.h"
#include "hpl1/engine/graphics/GraphicsTypes.h"
#include "hpl1/engine/math/MathTypes.h"
#include "hpl1/std/set.h"

namespace hpl {

#define kFilterProgramNum (1)

class iLowLevelGraphics;
class LowLevelResources;
class iGpuProgram;
class cResources;
class iTexture;
class cGpuProgramManager;
class cRenderList;
class cRenderer3D;

enum ePostEffectFilter {
    ePostEffectFilter_Offset,
    ePostEffectFilter_LastEnum
};

enum ePostEffectProgram {
    ePostEffectProgram_Offset,
    ePostEffectProgram_LastEnum
};

class cImageTrailEffect {
public:
    cImageTrailEffect() : mbActive(false), mbFirstPass(false), mlCurrentBuffer(0) {}

    bool mbActive;
    bool mbFirstPass;
    int mlCurrentBuffer;
    float mfAmount;
};

class cResources;

class cRendererPostEffects {
public:
    cRendererPostEffects(iLowLevelGraphics *apLowLevelGraphics, cResources *apResources,
                         cRenderList *apRenderList, cRenderer3D *apRenderer3D);
    ~cRendererPostEffects();

    void Render();

    void SetImageTrailActive(bool abX) {
        if (!mImageTrailData.mbActive && abX)
            mImageTrailData.mbFirstPass = true;
        mImageTrailData.mbActive = abX;
    }
    bool GetImageTrailActive() { return mImageTrailData.mbActive; }
    void SetImageTrailAmount(float afAmount) { mImageTrailData.mfAmount = afAmount; }

    iTexture *GetScreenBuffer(int alNum) { return mpScreenBuffer[alNum]; }

    void SetActive(bool abX) { mbActive = abX; }
    bool GetActive() { return mbActive; }

    void SetBloomActive(bool abX);
    bool GetBloomActive() { return mbBloomActive; }

    void SetBloomSpread(float afX) { mfBloomSpread = afX; }
    float GetBloomSpread() { return mfBloomSpread; }

    void SetMotionBlurActive(bool abX);
    bool GetMotionBlurActive() { return mbMotionBlurActive; }

    void SetMotionBlurAmount(float afX) { mfMotionBlurAmount = afX; }
    float GetMotionBlurAmount() { return mfMotionBlurAmount; }

    void SetDepthOfFieldActive(bool abX) { mbDofActive = abX; }
    void SetDepthOfFieldMaxBlur(float afX) { mfDofMaxBlur = afX; }
    void SetDepthOfFieldFocalPlane(float afX) { mfDofFocalPlane = afX; }
    void SetDepthOfFieldNearPlane(float afX) { mfDofNearPlane = afX; }
    void SetDepthOfFieldFarPlane(float afX) { mfDofFarPlane = afX; }

    bool GetDepthOfFieldActive() { return mbDofActive; }
    float GetDepthOfFieldMaxBlur() { return mfDofMaxBlur; }
    float GetDepthOfFieldFocalPlane() { return mfDofFocalPlane; }
    float GetDepthOfFieldNearPlane() { return mfDofNearPlane; }
    float GetDepthOfFieldFarPlane() { return mfDofFarPlane; }

    iTexture *GetFreeScreenTexture() { return mpScreenBuffer[mImageTrailData.mlCurrentBuffer == 0 ? 1 : 0]; }

    void RenderBlurTexture(iTexture *apDestination, iTexture *apSource, float afBlurAmount);

private:
    void RenderImageTrail();

    void RenderBloom();

    void RenderMotionBlur();

    void RenderDepthOfField();

    iLowLevelGraphics *mpLowLevelGraphics;
    LowLevelResources *mpLowLevelResources;
    cResources *mpResources;
    cGpuProgramManager *mpGpuManager;
    cRenderer3D *mpRenderer3D;

    cRenderList *mpRenderList;

    cVector2f mvScreenSize;

    iTexture *mpScreenBuffer[2];

    cImageTrailEffect mImageTrailData;

    iGpuProgram *_blur2DProgram;
    iGpuProgram *_blurRectProgram;
    bool mbBlurFallback;

    iGpuProgram *_bloomProgram;

    iTexture *mpBloomBlurTexture;

    iGpuProgram *_motionBlurProgram;

    iGpuProgram *_depthOfFieldProgram;
    iTexture *mpDofBlurTexture;

    tVertexVec mvTexRectVtx;

    bool mbBloomActive;
    float mfBloomSpread;

    bool mbMotionBlurActive;
    float mfMotionBlurAmount;
    bool mbMotionBlurFirstTime;

    bool mbDofActive;
    float mfDofMaxBlur;
    float mfDofFocalPlane;
    float mfDofNearPlane;
    float mfDofFarPlane;

    bool mbActive;
};

} // namespace hpl

#endif // HPL_RENDERER_POST_EFFECTS_H