/*  ZZ Open GL graphics plugin
 *  Copyright (c)2009-2010 zeydlitz@gmail.com, arcum42@gmail.com
 *  Based on Zerofrog's ZeroGS KOSMOS (c)2005-2008
 *
 *  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 2 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, write to the Free Software
 *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
 */

#ifndef __ZEROGS__H
#define __ZEROGS__H

#ifdef _MSC_VER
#pragma warning(disable:4200) // nonstandard extension used : zero-sized array in struct/union
#endif

// ----------------------------- Includes
#include <list>
#include <vector>
#include <map>
#include <string>

#include "ZZGl.h"
#include "GS.h"
#include "CRC.h"
#include "rasterfont.h" // simple font
#include "ZeroGSShaders/zerogsshaders.h"

using namespace std;



//------------------------ Constants ----------------------
#define VB_BUFFERSIZE			   0x400

// Used in a logarithmic Z-test, as (1-o(1))/log(MAX_U32).
const float g_filog32 = 0.999f / (32.0f * logf(2.0f));

//------------------------ Inlines -------------------------


// Calculate maximum height for target
inline int get_maxheight(int fbp, int fbw, int psm)
{
	int ret;

	if (fbw == 0) return 0;

	ret = (((0x00100000 - 64 * fbp) / fbw) & ~0x1f);
	if (PSMT_ISHALF(psm)) ret *= 2;

	return ret;
}

// Does psm need Alpha test with alpha expansion?
inline int nNeedAlpha(u8 psm)
{
	return (psm == PSMCT24 || psm == PSMCT16 || psm == PSMCT16S);
}

// Get color storage model psm, that is important on flush stage.
inline u8 GetTexCPSM(const tex0Info& tex)
{
	if (PSMT_ISCLUT(tex.psm))
		return tex.cpsm;
	else
		return tex.psm;
}


// ------------------------ Variables -------------------------
// all textures have this width
//#define GPU_TEXWIDTH		512
extern int GPU_TEXWIDTH;
extern float g_fiGPU_TEXWIDTH;
#define MASKDIVISOR		0
#define GPU_TEXMASKWIDTH	(1024 >> MASKDIVISOR) // bitwise mask width for region repeat mode

extern u32 ptexBilinearBlocks;

// this is currently *not* used as a bool, in spite of its moniker --air
// Actually, the only thing written to it is 1 or 0, which makes the (g_bSaveFlushedFrame & 0x80000000) check rather bizzare.
//extern u32 g_bSaveFlushedFrame;	

//////////////////////////
// State parameters


#ifdef DEVBUILD
extern char* EFFECT_NAME;
extern char* EFFECT_DIR;
extern u32 g_nGenVars, g_nTexVars, g_nAlphaVars, g_nResolve;
extern bool g_bSaveTrans, g_bUpdateEffect, g_bSaveTex, g_bSaveResolved;
#endif

extern u32 s_uFramebuffer;
extern int g_nPixelShaderVer;

extern bool s_bWriteDepth;

extern u32 ptexLogo;
extern int nLogoWidth, nLogoHeight;
extern int nBackbufferWidth, nBackbufferHeight;

extern u8* g_pbyGSMemory;
extern u8* g_pbyGSClut; // the temporary clut buffer

namespace ZeroGS
{

typedef void (*DrawFn)();

enum RenderFormatType
{
	RFT_byte8 = 0,	  // A8R8G8B8
	RFT_float16 = 1,	// A32R32B32G32
};

// managers render-to-texture targets

class CRenderTarget
{

	public:
		CRenderTarget();
		virtual ~CRenderTarget();

		virtual bool Create(const frameInfo& frame);
		virtual void Destroy();

		// set the GPU_POSXY variable, scissor rect, and current render target
		void SetTarget(int fbplocal, const Rect2& scissor, int context);
		void SetViewport();

		// copies/creates the feedback contents
		inline void CreateFeedback()
		{
			if (ptexFeedback == 0 || !(status&TS_FeedbackReady))
				_CreateFeedback();
		}

		virtual void Resolve();
		virtual void Resolve(int startrange, int endrange); // resolves only in the allowed range
		virtual void Update(int context, CRenderTarget* pdepth);
		virtual void ConvertTo32(); // converts a psm==2 target, to a psm==0
		virtual void ConvertTo16(); // converts a psm==0 target, to a psm==2

		virtual bool IsDepth() { return false; }

		void SetRenderTarget(int targ);

		void* psys;   // system data used for comparison
		u32 ptex;

		int fbp, fbw, fbh, fbhCalc; // if fbp is negative, virtual target (not mapped to any real addr)
		int start, end; // in bytes
		u32 lastused;	// time stamp since last used
		Vector vposxy;

		u32 fbm;
		u16 status;
		u8 psm;
		u8 resv0;
		Rect scissorrect;

		u8 created;	// Check for object destruction/creating for r201.

		//int startresolve, endresolve;
		u32 nUpdateTarg; // use this target to update the texture if non 0 (one time only)

		// this is optionally used when feedback effects are used (render target is used as a texture when rendering to itself)
		u32 ptexFeedback;

		enum TargetStatus
		{
			TS_Resolved = 1,
			TS_NeedUpdate = 2,
			TS_Virtual = 4, // currently not mapped to memory
			TS_FeedbackReady = 8, // feedback effect is ready and doesn't need to be updated
			TS_NeedConvert32 = 16,
			TS_NeedConvert16 = 32,
		};
		inline Vector DefaultBitBltPos() ;
		inline Vector DefaultBitBltTex() ;

	private:
		void _CreateFeedback();
		inline bool InitialiseDefaultTexture(u32 *p_ptr, int fbw, int fbh) ;
};

// manages zbuffers

class CDepthTarget : public CRenderTarget
{

	public:
		CDepthTarget();
		virtual ~CDepthTarget();

		virtual bool Create(const frameInfo& frame);
		virtual void Destroy();

		virtual void Resolve();
		virtual void Resolve(int startrange, int endrange); // resolves only in the allowed range
		virtual void Update(int context, CRenderTarget* prndr);

		virtual bool IsDepth() { return true; }

		void SetDepthStencilSurface();

		u32 pdepth;		 // 24 bit, will contain the stencil buffer if possible
		u32 pstencil;	   // if not 0, contains the stencil buffer
		int icount;		 // internal counter
};

// manages contiguous chunks of memory (width is always 1024)

class CMemoryTarget
{
	public:
		struct TEXTURE
		{
			inline TEXTURE() : tex(0), memptr(NULL), ref(0) {}
			inline ~TEXTURE() { glDeleteTextures(1, &tex); _aligned_free(memptr); }

			u32 tex;
			u8* memptr;  // GPU memory used for comparison
			int ref;
		};

		inline CMemoryTarget() : ptex(NULL), starty(0), height(0), realy(0), realheight(0), usedstamp(0), psm(0), cpsm(0), channels(0), clearminy(0), clearmaxy(0), validatecount(0) {}

		inline CMemoryTarget(const CMemoryTarget& r)
		{
			ptex = r.ptex;

			if (ptex != NULL) ptex->ref++;

			starty = r.starty;
			height = r.height;
			realy = r.realy;
			realheight = r.realheight;
			usedstamp = r.usedstamp;
			psm = r.psm;
			cpsm = r.cpsm;
			clut = r.clut;
			clearminy = r.clearminy;
			clearmaxy = r.clearmaxy;
			widthmult = r.widthmult;
			channels = r.channels;
			validatecount = r.validatecount;
			fmt = r.fmt;
		}

		~CMemoryTarget() { Destroy(); }

		inline void Destroy()
		{
			if (ptex != NULL && ptex->ref > 0)
			{
				if (--ptex->ref <= 0) delete ptex;
			}

			ptex = NULL;
		}

		// returns true if clut data is synced
		bool ValidateClut(const tex0Info& tex0);
		// returns true if tex data is synced
		bool ValidateTex(const tex0Info& tex0, int starttex, int endtex, bool bDeleteBadTex);

		// realy is offset in pixels from start of valid region
		// so texture in memory is [realy,starty+height]
		// valid texture is [starty,starty+height]
		// offset in mem [starty-realy, height]
		TEXTURE* ptex; // can be 16bit

		int starty, height; // assert(starty >= realy)
		int realy, realheight; // this is never touched once allocated
		u32 usedstamp;
		u8 psm, cpsm; // texture and clut format. For psm, only 16bit/32bit differentiation matters

		u32 fmt;

		int widthmult;
		int channels;
		int clearminy, clearmaxy; // when maxy > 0, need to check for clearing

		int validatecount; // count how many times has been validated, if too many, destroy

		vector<u8> clut; // if nonzero, texture uses CLUT
};


struct VB
{
	VB();
	~VB();

	void Destroy();

	inline bool CheckPrim()
	{
		static const int PRIMMASK = 0x0e;   // for now ignore 0x10 (AA)

		if ((PRIMMASK & prim->_val) != (PRIMMASK & curprim._val) || primtype[prim->prim] != primtype[curprim.prim])
			return nCount > 0;

		return false;
	}

	void CheckFrame(int tbp);

	// context specific state
	Point offset;
	Rect2 scissor;
	tex0Info tex0;
	tex1Info tex1;
	miptbpInfo miptbp0;
	miptbpInfo miptbp1;
	alphaInfo alpha;
	fbaInfo fba;
	clampInfo clamp;
	pixTest test;
	u32 ptexClamp[2]; // textures for x and y dir region clamping

public:
	void FlushTexData();
	inline int CheckFrameAddConstraints(int tbp);
	inline void CheckScissors(int maxpos);
	inline void CheckFrame32bitRes(int maxpos);
	inline int FindMinimalMemoryConstrain(int tbp, int maxpos);
	inline int FindZbufferMemoryConstrain(int tbp, int maxpos);
	inline int FindMinimalHeightConstrain(int maxpos);

	inline int CheckFrameResolveRender(int tbp);
	inline void CheckFrame16vs32Conversion();
	inline int CheckFrameResolveDepth(int tbp);

	inline void FlushTexUnchangedClutDontUpdate() ;
	inline void FlushTexClutDontUpdate() ;
	inline void FlushTexClutting() ;
	inline void FlushTexSetNewVars(u32 psm) ;

	// notify VB that nVerts need to be written to pbuf
	inline void NotifyWrite(int nVerts)
	{
		assert(pBufferData != NULL && nCount <= nNumVertices && nVerts > 0);

		if (nCount + nVerts > nNumVertices)
		{
			// recreate except with a bigger count
			VertexGPU* ptemp = (VertexGPU*)_aligned_malloc(sizeof(VertexGPU) * nNumVertices * 2, 256);
			memcpy_amd(ptemp, pBufferData, sizeof(VertexGPU) * nCount);
			nNumVertices *= 2;
			assert(nCount + nVerts <= nNumVertices);
			_aligned_free(pBufferData);
			pBufferData = ptemp;
		}
	}

	void Init(int nVerts)
	{
		if (pBufferData == NULL && nVerts > 0)
		{
			pBufferData = (VertexGPU*)_aligned_malloc(sizeof(VertexGPU) * nVerts, 256);
			nNumVertices = nVerts;
		}

		nCount = 0;
	}

	u8 bNeedFrameCheck;
	u8 bNeedZCheck;
	u8 bNeedTexCheck;
	u8 dummy0;

	union
	{
		struct
		{
			u8 bTexConstsSync; // only pixel shader constants that context owns
			u8 bVarsTexSync; // texture info
			u8 bVarsSetTarg;
			u8 dummy1;
		};

		u32 bSyncVars;
	};

	int ictx;
	VertexGPU* pBufferData; // current allocated data

	int nNumVertices;   // size of pBufferData in terms of VertexGPU objects
	int nCount;
	primInfo curprim;	// the previous prim the current buffers are set to

	zbufInfo zbuf;
	frameInfo gsfb; // the real info set by FRAME cmd
	frameInfo frame;
	int zprimmask; // zmask for incoming points

union
{
	u32 uCurTex0Data[2]; // current tex0 data
	GIFRegTEX0 uCurTex0;	
};
	u32 uNextTex0Data[2]; // tex0 data that has to be applied if bNeedTexCheck is 1

	//int nFrameHeights[8];	// frame heights for the past frame changes
	int nNextFrameHeight;

	CMemoryTarget* pmemtarg; // the current mem target set
	CRenderTarget* prndr;
	CDepthTarget* pdepth;
};

// Return, if tcc, aem or psm mode told us, than Alpha test should be used
// if tcc == 0 than no alpha used, aem used for alpha expanding and I am not sure
// that it's correct, psm -- color mode,
inline bool
IsAlphaTestExpansion(VB& curvb)
{
	return (curvb.tex0.tcc && gs.texa.aem && nNeedAlpha(GetTexCPSM(curvb.tex0)));
}

// visible members
extern DrawFn drawfn[8];

// VB variables
extern VB vb[2];
extern float fiTexWidth[2], fiTexHeight[2];	// current tex width and height
extern vector<GLuint> g_vboBuffers; // VBOs for all drawing commands
extern GLuint vboRect;
extern int g_nCurVBOIndex;

// Shaders variables
extern Vector g_vdepth;
extern Vector vlogz;
extern VERTEXSHADER pvsBitBlt;
extern FRAGMENTSHADER ppsBitBlt[2], ppsBitBltDepth, ppsOne;
extern FRAGMENTSHADER ppsBaseTexture, ppsConvert16to32, ppsConvert32to16;
bool LoadEffects();
bool LoadExtraEffects();
FRAGMENTSHADER* LoadShadeEffect(int type, int texfilter, int fog, int testaem, int exactcolor, const clampInfo& clamp, int context, bool* pbFailed);

extern RenderFormatType g_RenderFormatType;

void AddMessage(const char* pstr, u32 ms = 5000);
void DrawText(const char* pstr, int left, int top, u32 color);
void ChangeWindowSize(int nNewWidth, int nNewHeight);
void SetChangeDeviceSize(int nNewWidth, int nNewHeight);
void ChangeDeviceSize(int nNewWidth, int nNewHeight);
void SetAA(int mode);
void SetNegAA(int mode);
void SetCRC(int crc);

void ReloadEffects();

// Methods //
bool IsGLExt(const char* szTargetExtension);   ///< returns true if the the opengl extension is supported
inline bool Create_Window(int _width, int _height);
bool Create(int width, int height);
void Destroy(bool bD3D);

void Restore(); // call to restore device
void Reset(); // call to destroy video resources
void GSStateReset();
void GSReset();
void GSSoftReset(u32 mask);

void HandleGLError();

// called on a primitive switch
void Prim();

void SetTexFlush();
// flush current vertices, call before setting new registers (the main render method)
void Flush(int context);
void FlushBoth();
void ExtWrite();

void SetWriteDepth();
bool IsWriteDepth();

void SetDestAlphaTest();
bool IsWriteDestAlphaTest();

void SetFogColor(u32 fog);
void SetFogColor(GIFRegFOGCOL* fog);
void SaveTex(tex0Info* ptex, int usevid);
char* NamedSaveTex(tex0Info* ptex, int usevid);

// called when trxdir is accessed. If host is involved, transfers memory to temp buffer byTransferBuf.
// Otherwise performs the transfer. TODO: Perhaps divide the transfers into chunks?
void InitTransferHostLocal();
void TransferHostLocal(const void* pbyMem, u32 nQWordSize);

void InitTransferLocalHost();
void TransferLocalHost(void* pbyMem, u32 nQWordSize);
inline void TerminateLocalHost() {}

void TransferLocalLocal();

// switches the render target to the real target, flushes the current render targets and renders the real image
void RenderCRTC(int interlace);
void ResetRenderTarget(int index);

bool CheckChangeInClut(u32 highdword, u32 psm); // returns true if clut will change after this tex0 op

// call to load CLUT data (depending on CLD)
void texClutWrite(int ctx);
RenderFormatType GetRenderFormat();
GLenum GetRenderTargetFormat();

int Save(s8* pbydata);
bool Load(s8* pbydata);

void SaveSnapshot(const char* filename);
bool SaveRenderTarget(const char* filename, int width, int height, int jpeg);
bool SaveTexture(const char* filename, u32 textarget, u32 tex, int width, int height);
bool SaveJPEG(const char* filename, int width, int height, const void* pdata, int quality);
bool SaveTGA(const char* filename, int width, int height, void* pdata);
void Stop_Avi();
void Delete_Avi_Capture();

// private methods
void FlushSysMem(const RECT* prc);
void _Resolve(const void* psrc, int fbp, int fbw, int fbh, int psm, u32 fbm, bool mode);

// returns the first and last addresses aligned to a page that cover
void GetRectMemAddress(int& start, int& end, int psm, int x, int y, int w, int h, int bp, int bw);

// inits the smallest rectangle in ptexMem that covers this region in ptexMem
// returns the offset that needs to be added to the locked rect to get the beginning of the buffer
//void GetMemRect(RECT& rc, int psm, int x, int y, int w, int h, int bp, int bw);

void SetContextTarget(int context) ;

void NeedFactor(int w);
// only sets a limited amount of state (for Update)
void SetTexClamping(int context, FRAGMENTSHADER* pfragment);
void SetTexVariablesInt(int context, int bilinear, const tex0Info& tex0, ZeroGS::CMemoryTarget* pmemtarg, FRAGMENTSHADER* pfragment, int force);

void ResetAlphaVariables();

void StartCapture();
void StopCapture();
void CaptureFrame();

// Perform clutting for flushed texture. Better check if it needs a prior call.
inline void CluttingForFlushedTex(tex0Info* tex0, u32 Data, int ictx)
{
	tex0->cbp  = ZZOglGet_cbp_TexBits(Data);
	tex0->cpsm = ZZOglGet_cpsm_TexBits(Data);
	tex0->csm  = ZZOglGet_csm_TexBits(Data);
	tex0->csa  = ZZOglGet_csa_TexBits(Data);
	tex0->cld  = ZZOglGet_cld_TexBits(Data);

	ZeroGS::texClutWrite(ictx);
}
};

#endif