// 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"

#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 C_COLORS       0
#define C_KCOLORS      (C_COLORS + 4)
#define C_ALPHA        (C_KCOLORS + 4)
#define C_TEXDIMS      (C_ALPHA + 1)
#define C_ZBIAS        (C_TEXDIMS + 8)
#define C_INDTEXSCALE  (C_ZBIAS + 2)
#define C_INDTEXMTX    (C_INDTEXSCALE + 2)
#define C_FOG          (C_INDTEXMTX + 6)
#define C_COLORMATRIX  (C_FOG + 2)
#define C_PENVCONST_END (C_COLORMATRIX + 16)
#define PIXELSHADERUID_MAX_VALUES (5 + 32 + 6 + 11)

// DO NOT make anything in this class virtual.
class PIXELSHADERUID
{
public:
	u32 values[PIXELSHADERUID_MAX_VALUES];
	u16 tevstages, indstages;

	PIXELSHADERUID() 
	{
		memset(values, 0, PIXELSHADERUID_MAX_VALUES * 4);
		tevstages = indstages = 0;
	}

	PIXELSHADERUID(const PIXELSHADERUID& r)
	{
		tevstages = r.tevstages;
		indstages = r.indstages;
		int N = GetNumValues();
		_assert_(N <= PIXELSHADERUID_MAX_VALUES);
		for (int i = 0; i < N; ++i) 
			values[i] = r.values[i];
	}

	int GetNumValues() const 
	{
		return tevstages + indstages + 4;
	}

	bool operator <(const PIXELSHADERUID& _Right) const
	{
		if (values[0] < _Right.values[0])
			return true;
		else if (values[0] > _Right.values[0])
			return false;
		int N = GetNumValues();
		for (int i = 1; i < N; ++i) 
		{
			if (values[i] < _Right.values[i])
				return true;
			else if (values[i] > _Right.values[i])
				return false;
		}
		return false;
	}

	bool operator ==(const PIXELSHADERUID& _Right) const
	{
		if (values[0] != _Right.values[0])
			return false;
		int N = GetNumValues();
		for (int i = 1; i < N; ++i) 
		{
			if (values[i] != _Right.values[i])
				return false;
		}
		return true;
	}
};

const char *GeneratePixelShaderCode(bool dstAlphaEnable, API_TYPE ApiType);
void GetPixelShaderId(PIXELSHADERUID *uid, u32 dstAlphaEnable);

extern PIXELSHADERUID last_pixel_shader_uid;

#endif // GCOGL_PIXELSHADER_H