qzdoom/src/gl/renderer/gl_renderer.h

#ifndef __GL_RENDERER_H
#define __GL_RENDERER_H

#include "r_defs.h"
#include "v_video.h"
#include "vectors.h"
#include "r_renderer.h"
#include "gl/data/gl_matrix.h"
#include "gl/dynlights/gl_shadowmap.h"

struct particle_t;
class FCanvasTexture;
class FFlatVertexBuffer;
class FSkyVertexBuffer;
class OpenGLFrameBuffer;
struct FDrawInfo;
class FShaderManager;
class GLPortal;
class FLightBuffer;
class FSamplerManager;
class DPSprite;
class FGLRenderBuffers;
class FLinearDepthShader;
class FDepthBlurShader;
class FSSAOShader;
class FSSAOCombineShader;
class FBloomExtractShader;
class FBloomCombineShader;
class FExposureExtractShader;
class FExposureAverageShader;
class FExposureCombineShader;
class FBlurShader;
class FTonemapShader;
class FColormapShader;
class FLensShader;
class FFXAALumaShader;
class FFXAAShader;
class FPresentShader;
class FPresent3DCheckerShader;
class FPresent3DColumnShader; 
class FPresent3DRowShader;
class F2DDrawer;
class FHardwareTexture;
class FShadowMapShader;
class PostProcessShaderInstance;

inline float DEG2RAD(float deg)
{
	return deg * float(M_PI / 180.0);
}

inline float RAD2DEG(float deg)
{
	return deg * float(180. / M_PI);
}

enum SectorRenderFlags
{
	// This is used to avoid creating too many drawinfos
	SSRF_RENDERFLOOR = 1,
	SSRF_RENDERCEILING = 2,
	SSRF_RENDER3DPLANES = 4,
	SSRF_RENDERALL = 7,
	SSRF_PROCESSED = 8,
	SSRF_SEEN = 16,
};

struct GL_IRECT
{
	int left,top;
	int width,height;


	void Offset(int xofs,int yofs)
	{
		left+=xofs;
		top+=yofs;
	}
};

enum
{
	DM_MAINVIEW,
	DM_OFFSCREEN,
	DM_PORTAL,
	DM_SKYPORTAL
};

struct PostProcessShader
{
	FString Target;
	FString ShaderLumpName;
	int ShaderVersion = 0;
	FTexture *Texture = nullptr;

	FString Name;
	TMap<FString, int> Uniform1i;
	TMap<FString, float> Uniform1f;

	std::shared_ptr<PostProcessShaderInstance> Instance;
};

extern TArray<PostProcessShader> PostProcessShaders;

class FGLRenderer
{
public:

	OpenGLFrameBuffer *framebuffer;
	GLPortal *mClipPortal;
	GLPortal *mCurrentPortal;
	int mMirrorCount;
	int mPlaneMirrorCount;
	int mLightCount;
	float mCurrentFoV;
	AActor *mViewActor;
	FShaderManager *mShaderManager;
	FSamplerManager *mSamplerManager;
	int gl_spriteindex;
	unsigned int mFBID;
	unsigned int mVAOID;
	int mOldFBID;

	FGLRenderBuffers *mBuffers;
	FLinearDepthShader *mLinearDepthShader;
	FSSAOShader *mSSAOShader;
	FDepthBlurShader *mDepthBlurShader;
	FSSAOCombineShader *mSSAOCombineShader;
	FBloomExtractShader *mBloomExtractShader;
	FBloomCombineShader *mBloomCombineShader;
	FExposureExtractShader *mExposureExtractShader;
	FExposureAverageShader *mExposureAverageShader;
	FExposureCombineShader *mExposureCombineShader;
	FBlurShader *mBlurShader;
	FTonemapShader *mTonemapShader;
	FColormapShader *mColormapShader;
	FHardwareTexture *mTonemapPalette;
	FLensShader *mLensShader;
	FFXAALumaShader *mFXAALumaShader;
	FFXAAShader *mFXAAShader;
	FPresentShader *mPresentShader;
	FPresent3DCheckerShader *mPresent3dCheckerShader;
	FPresent3DColumnShader *mPresent3dColumnShader;
	FPresent3DRowShader *mPresent3dRowShader;
	FShadowMapShader *mShadowMapShader;

	FShadowMap mShadowMap;

	FTexture *gllight;
	FTexture *glpart2;
	FTexture *glpart;
	FTexture *mirrortexture;
	
	float mSky1Pos, mSky2Pos;

	FRotator mAngles;
	FVector2 mViewVector;

	FFlatVertexBuffer *mVBO;
	FSkyVertexBuffer *mSkyVBO;
	FLightBuffer *mLights;
	F2DDrawer *m2DDrawer;

	GL_IRECT mScreenViewport;
	GL_IRECT mSceneViewport;
	GL_IRECT mOutputLetterbox;
	bool mDrawingScene2D = false;

	float mSceneClearColor[3];

	FGLRenderer(OpenGLFrameBuffer *fb);
	~FGLRenderer() ;

	void SetOutputViewport(GL_IRECT *bounds);
	int ScreenToWindowX(int x);
	int ScreenToWindowY(int y);

	void Initialize(int width, int height);

	void Begin2D();
	void ClearBorders();

	void FlushTextures();
	unsigned char *GetTextureBuffer(FTexture *tex, int &w, int &h);
	void SetupLevel();

	void RenderView(player_t* player);

	void RenderScreenQuad();
	void PostProcessScene(int fixedcm);
	void RunCustomPostProcessShaders(FString target);
	void AmbientOccludeScene();
	void UpdateCameraExposure();
	void BloomScene(int fixedcm);
	void TonemapScene();
	void ColormapScene(int fixedcm);
	void CreateTonemapPalette();
	void ClearTonemapPalette();
	void LensDistortScene();
	void ApplyFXAA();
	void CopyToBackbuffer(const GL_IRECT *bounds, bool applyGamma);
	void DrawPresentTexture(const GL_IRECT &box, bool applyGamma);
	void Flush();


	bool StartOffscreen();
	void EndOffscreen();

	void FillSimplePoly(FTexture *texture, FVector2 *points, int npoints,
		double originx, double originy, double scalex, double scaley,
		DAngle rotation, const FColormap &colormap, PalEntry flatcolor, int lightlevel, int bottomclip);

	int PTM_BestColor (const uint32_t *pal_in, int r, int g, int b, int first, int num);

	static float GetZNear() { return 5.f; }
	static float GetZFar() { return 65536.f; }
};

enum area_t
{
	area_normal,
	area_below,
	area_above,
	area_default
};


// Global functions. Make them members of GLRenderer later?
bool gl_CheckClip(side_t * sidedef, sector_t * frontsector, sector_t * backsector);
sector_t * gl_FakeFlat(sector_t * sec, sector_t * dest, area_t in_area, bool back);

struct TexFilter_s
{
	int minfilter;
	int magfilter;
	bool mipmapping;
} ;


extern FGLRenderer *GLRenderer;

#endif