// Copyright (C) 2003 Dolphin Project.

// 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, version 2.0.

// 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 2.0 for more details.

// A copy of the GPL 2.0 should have been included with the program.
// If not, see http://www.gnu.org/licenses/

// Official SVN repository and contact information can be found at
// http://code.google.com/p/dolphin-emu/

#ifndef GCOGL_PIXELSHADER_H
#define GCOGL_PIXELSHADER_H

#include "VideoCommon.h"
#include "ShaderGenCommon.h"

#define I_COLORS      "color"
#define I_KCOLORS     "k"
#define I_ALPHA       "alphaRef"
#define I_TEXDIMS     "texdim"
#define I_ZBIAS       "czbias"
#define I_INDTEXSCALE "cindscale"
#define I_INDTEXMTX   "cindmtx"
#define I_FOG         "cfog"
#define I_PLIGHTS	  "cLights"
#define I_PMATERIALS   "cmtrl"

#define C_COLORMATRIX	0						// 0
#define C_COLORS		0						// 0
#define C_KCOLORS		(C_COLORS + 4)			// 4
#define C_ALPHA			(C_KCOLORS + 4)			// 8
#define C_TEXDIMS		(C_ALPHA + 1)			// 9
#define C_ZBIAS			(C_TEXDIMS + 8)			//17
#define C_INDTEXSCALE	(C_ZBIAS + 2)			//19
#define C_INDTEXMTX		(C_INDTEXSCALE + 2)		//21
#define C_FOG			(C_INDTEXMTX + 6)		//27

#define C_PLIGHTS		(C_FOG + 3)
#define C_PMATERIALS	(C_PLIGHTS + 40)
#define C_PENVCONST_END (C_PMATERIALS + 4)

// Different ways to achieve rendering with destination alpha
enum DSTALPHA_MODE
{
	DSTALPHA_NONE, // Render normally, without destination alpha
	DSTALPHA_ALPHA_PASS, // Render normally first, then render again for alpha
	DSTALPHA_DUAL_SOURCE_BLEND // Use dual-source blending
};

enum ALPHA_PRETEST_RESULT
{
	ALPHAPT_UNDEFINED, // AlphaTest Result is not defined
	ALPHAPT_ALWAYSFAIL, // Alpha test alway Fail
	ALPHAPT_ALWAYSPASS // Alpha test alway Pass
};

struct pixel_shader_uid_data
{
	u32 components;
	DSTALPHA_MODE dstAlphaMode; // TODO: as u32 :2
	ALPHA_PRETEST_RESULT Pretest; // TODO: As :2
	u32 nIndirectStagesUsed : 8;
	struct {
        u32 numtexgens : 4;
        u32 numtevstages : 4;
		u32 numindstages : 3;
	} genMode;
	u32 fogc_proj_fselfsel : 3;
	struct
	{
		u32 unknown : 1;
		u32 projection : 1; // XF_TEXPROJ_X
		u32 inputform : 2; // XF_TEXINPUT_X
		u32 texgentype : 3; // XF_TEXGEN_X
		u32 sourcerow : 5; // XF_SRCGEOM_X
		u32 embosssourceshift : 3; // what generated texcoord to use
		u32 embosslightshift : 3; // light index that is used
	} texMtxInfo[8];
	struct
	{
        u32 bi0 : 3; // indirect tex stage 0 ntexmap
        u32 bc0 : 3; // indirect tex stage 0 ntexcoord
        u32 bi1 : 3;
        u32 bc1 : 3;
        u32 bi2 : 3;
        u32 bc3 : 3;
        u32 bi4 : 3;
        u32 bc4 : 3;
	} tevindref;
};

typedef ShaderUid<pixel_shader_uid_data> PixelShaderUid;
typedef ShaderCode<pixel_shader_uid_data> PixelShaderCode;


void GeneratePixelShaderCode(PixelShaderCode& object, DSTALPHA_MODE dstAlphaMode, API_TYPE ApiType, u32 components);
void GetPixelShaderId(PixelShaderUid& object, DSTALPHA_MODE dstAlphaMode, API_TYPE ApiType, u32 components);

#endif // GCOGL_PIXELSHADER_H