// Copyright 2013 Dolphin Emulator Project
// Licensed under GPLv2
// Refer to the license.txt file included.

#ifndef GCOGL_PIXELSHADER_H
#define GCOGL_PIXELSHADER_H

#include "VideoCommon.h"
#include "ShaderGenCommon.h"
#include "BPMemory.h"
#include "LightingShaderGen.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     "cPLights"
#define I_PMATERIALS  "cPmtrl"

#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
};

// Annoying sure, can be removed once we get up to GLSL ~1.3
const s_svar PSVar_Loc[] = { {I_COLORS, C_COLORS, 4 },
						{I_KCOLORS, C_KCOLORS, 4 },
						{I_ALPHA, C_ALPHA, 1 },
						{I_TEXDIMS, C_TEXDIMS, 8 },
						{I_ZBIAS , C_ZBIAS, 2  },
						{I_INDTEXSCALE , C_INDTEXSCALE, 2  },
						{I_INDTEXMTX, C_INDTEXMTX, 6 },
						{I_FOG, C_FOG, 3 },
						{I_PLIGHTS, C_PLIGHTS, 40 },
						{I_PMATERIALS, C_PMATERIALS, 4 },
						};

#pragma pack(1)
struct pixel_shader_uid_data
{
	// TODO: Optimize field order for easy access!

	u32 num_values; // TODO: Shouldn't be a u32
	u32 NumValues() const { return num_values; }

	u32 components : 23;
	u32 dstAlphaMode : 2;
	u32 Pretest : 2;
	u32 nIndirectStagesUsed : 4;
	u32 pad0 : 1;

	u32 genMode_numtexgens : 4;
	u32 genMode_numtevstages : 4;
	u32 genMode_numindstages : 3;
	u32 alpha_test_comp0 : 3;
	u32 alpha_test_comp1 : 3;
	u32 alpha_test_logic : 2;
	u32 alpha_test_use_zcomploc_hack : 1;
	u32 fog_proj : 1;
	u32 fog_fsel : 3;
	u32 fog_RangeBaseEnabled : 1;
	u32 ztex_op : 2;
	u32 fast_depth_calc : 1;
	u32 per_pixel_depth : 1;
	u32 forced_early_z : 1;
	u32 early_ztest : 1;
	u32 pad1 : 1;

	u32 texMtxInfo_n_projection : 8; // 8x1 bit
	u32 tevindref_bi0 : 3;
	u32 tevindref_bc0 : 3;
	u32 tevindref_bi1 : 3;
	u32 tevindref_bc1 : 3;
	u32 tevindref_bi2 : 3;
	u32 tevindref_bc3 : 3;
	u32 tevindref_bi4 : 3;
	u32 tevindref_bc4 : 3;

	inline void SetTevindrefValues(int index, u32 texcoord, u32 texmap)
	{
		if (index == 0) { tevindref_bc0 = texcoord; tevindref_bi0 = texmap; }
		else if (index == 1) { tevindref_bc1 = texcoord; tevindref_bi1 = texmap; }
		else if (index == 2) { tevindref_bc3 = texcoord; tevindref_bi2 = texmap; }
		else if (index == 3) { tevindref_bc4 = texcoord; tevindref_bi4 = texmap; }
	}
	inline void SetTevindrefTexmap(int index, u32 texmap)
	{
		if (index == 0) { tevindref_bi0 = texmap; }
		else if (index == 1) { tevindref_bi1 = texmap; }
		else if (index == 2) { tevindref_bi2 = texmap; }
		else if (index == 3) { tevindref_bi4 = texmap; }
	}

	struct {
		// TODO: Can save a lot space by removing the padding bits
		u32 cc : 24;
		u32 ac : 24;

		u32 tevorders_texmap : 3;
		u32 tevorders_texcoord : 3;
		u32 tevorders_enable : 1;
		u32 tevorders_colorchan : 3;
		u32 pad1 : 6;

		// TODO: Clean up the swapXY mess
		u32 hasindstage : 1;
		u32 tevind : 21;
		u32 tevksel_swap1a : 2;
		u32 tevksel_swap2a : 2;
		u32 tevksel_swap1b : 2;
		u32 tevksel_swap2b : 2;
		u32 pad2 : 2;

		u32 tevksel_swap1c : 2;
		u32 tevksel_swap2c : 2;
		u32 tevksel_swap1d : 2;
		u32 tevksel_swap2d : 2;
		u32 tevksel_kc : 5;
		u32 tevksel_ka : 5;
		u32 pad3 : 14;
	} stagehash[16];

	// TODO: I think we're fine without an enablePixelLighting field, should probably double check, though..
	LightingUidData lighting;
};
#pragma pack()

typedef ShaderUid<pixel_shader_uid_data> PixelShaderUid;
typedef ShaderCode PixelShaderCode; // TODO: Obsolete
typedef ShaderConstantProfile PixelShaderConstantProfile; // TODO: Obsolete

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

#endif // GCOGL_PIXELSHADER_H