/*
-----------------------------------------------------------------------------
This source file is part of OGRE
(Object-oriented Graphics Rendering Engine)
For the latest info, see http://www.ogre3d.org/

Copyright (c) 2000-2006 Torus Knot Software Ltd
Also see acknowledgements in Readme.html

This program is free software; you can redistribute it and/or modify it under
the terms of the GNU Lesser 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 Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public License along with
this program; if not, write to the Free Software Foundation, Inc., 59 Temple
Place - Suite 330, Boston, MA 02111-1307, USA, or go to
http://www.gnu.org/copyleft/lesser.txt.

You may alternatively use this source under the terms of a specific version of
the OGRE Unrestricted License provided you have obtained such a license from
Torus Knot Software Ltd.
-----------------------------------------------------------------------------
*/

#include "OgreTerrainVertexProgram.h"

namespace Ogre {

    String TerrainVertexProgram::mNoFogArbvp1 = 
        "!!ARBvp1.0\n"
        "PARAM c5 = { 1, 1, 1, 1 };\n"
        "#var float4x4 worldViewProj :  : c[0], 4 : 8 : 1\n"
        "#var float morphFactor :  : c[4] : 9 : 1\n"
        "TEMP R0;\n"
        "ATTRIB v17 = vertex.attrib[1];\n"
        "ATTRIB v25 = vertex.texcoord[1];\n"
        "ATTRIB v24 = vertex.texcoord[0];\n"
        "ATTRIB v16 = vertex.position;\n"
        "PARAM c0[4] = { program.local[0..3] };\n"
        "PARAM c4 = program.local[4];\n"
        "	MOV result.texcoord[0], v24;\n"
        "	MOV result.texcoord[1], v25;\n"
        "	MOV R0, v16;\n"
        "	MAD R0.y, v17.x, c4.x, R0.y;\n"
        "	DP4 result.position.x, c0[0], R0;\n"
        "	DP4 result.position.y, c0[1], R0;\n"
        "	DP4 result.position.z, c0[2], R0;\n"
        "	DP4 result.position.w, c0[3], R0;\n"
        "	MOV result.color.front.primary, c5.x;\n"
        "END\n";

	String TerrainVertexProgram::mShadowReceiverArbvp1 = 
		"!!ARBvp1.0\n"
		"PARAM c[14] = { program.local[0..12], { 1 } };\n"
		"TEMP R0;\n"
		"TEMP R1;\n"
		"TEMP R2;\n"
		"MOV result.color, c[13].x;\n"
		"MUL R0.x, vertex.attrib[1], c[12];\n"
		"ADD R1.y, R0.x, vertex.position;\n"
		"MOV R1.xzw, vertex.position;\n"
		"DP4 result.position.w, R1, c[3];\n"
		"DP4 result.position.z, R1, c[2];\n"
		"DP4 R0.w, R1, c[7];\n"
		"DP4 R0.z, R1, c[6];\n"
		"DP4 R0.y, R1, c[5];\n"
		"DP4 R0.x, R1, c[4];\n"
		"DP4 result.position.y, R1, c[1];\n"
		"DP4 R2.y, R0, c[9];\n"
		"DP4 R2.z, R0, c[11];\n"
		"DP4 R2.x, R0, c[8];\n"
		"RCP R0.x, R2.z;\n"
		"DP4 result.position.x, R1, c[0];\n"
		"MUL result.texcoord[0].xy, R2, R0.x;\n"
		"END\n";
    String TerrainVertexProgram::mLinearFogArbvp1 = 
        "!!ARBvp1.0\n"
        "PARAM c5 = { 1, 1, 1, 1 };\n"
        "#var float4x4 worldViewProj :  : c[0], 4 : 9 : 1\n"
        "#var float morphFactor :  : c[4] : 10 : 1\n"
        "TEMP R0, R1;\n"
        "ATTRIB v17 = vertex.attrib[1];\n"
        "ATTRIB v25 = vertex.texcoord[1];\n"
        "ATTRIB v24 = vertex.texcoord[0];\n"
        "ATTRIB v16 = vertex.position;\n"
        "PARAM c0[4] = { program.local[0..3] };\n"
        "PARAM c4 = program.local[4];\n"
        "	MOV result.texcoord[0], v24;\n"
        "	MOV result.texcoord[1], v25;\n"
        "	MOV R1, v16;\n"
        "	MAD R1.y, v17.x, c4.x, R1.y;\n"
        "	DP4 R0.x, c0[0], R1;\n"
        "	DP4 R0.y, c0[1], R1;\n"
        "	DP4 R0.z, c0[2], R1;\n"
        "	DP4 R0.w, c0[3], R1;\n"
        "	MOV result.fogcoord.x, R0.z;\n"
        "	MOV result.position, R0;\n"
        "	MOV result.color.front.primary, c5.x;\n"
        "END\n";
    String TerrainVertexProgram::mExpFogArbvp1 = 
        "!!ARBvp1.0\n"
        "PARAM c6 = { 1, 1, 1, 1 };\n"
        "PARAM c7 = { 2.71828, 0, 0, 0 };\n"
        "#var float4x4 worldViewProj :  : c[0], 4 : 9 : 1\n"
        "#var float morphFactor :  : c[4] : 10 : 1\n"
        "#var float fogDensity :  : c[5] : 11 : 1\n"
        "TEMP R0, R1;\n"
        "ATTRIB v17 = vertex.attrib[1];\n"
        "ATTRIB v25 = vertex.texcoord[1];\n"
        "ATTRIB v24 = vertex.texcoord[0];\n"
        "ATTRIB v16 = vertex.position;\n"
        "PARAM c5 = program.local[5];\n"
        "PARAM c0[4] = { program.local[0..3] };\n"
        "PARAM c4 = program.local[4];\n"
        "	MOV result.texcoord[0], v24;\n"
        "	MOV result.texcoord[1], v25;\n"
        "	MOV R1, v16;\n"
        "	MAD R1.y, v17.x, c4.x, R1.y;\n"
        "	DP4 R0.x, c0[0], R1;\n"
        "	DP4 R0.y, c0[1], R1;\n"
        "	DP4 R0.z, c0[2], R1;\n"
        "	DP4 R0.w, c0[3], R1;\n"
        "	MOV result.position, R0;\n"
        "	MOV result.color.front.primary, c6.x;\n"
        "	MUL R0.zw, R0.z, c5.x;\n"
        "	MOV R0.xy, c7.x;\n"
        "	LIT R0.z, R0;\n"
        "	RCP result.fogcoord.x, R0.z;\n"
        "END\n";
    String TerrainVertexProgram::mExp2FogArbvp1 = 
        "!!ARBvp1.0\n"
        "PARAM c6 = { 1, 1, 1, 1 };\n"
        "PARAM c7 = { 0.002, 2.71828, 0, 0 };\n"
        "#var float4x4 worldViewProj :  : c[0], 4 : 9 : 1\n"
        "#var float morphFactor :  : c[4] : 10 : 1\n"
        "#var float fogDensity :  : c[5] : 11 : 1\n"
        "TEMP R0, R1;\n"
        "ATTRIB v17 = vertex.attrib[1];\n"
        "ATTRIB v25 = vertex.texcoord[1];\n"
        "ATTRIB v24 = vertex.texcoord[0];\n"
        "ATTRIB v16 = vertex.position;\n"
        "PARAM c0[4] = { program.local[0..3] };\n"
        "PARAM c4 = program.local[4];\n"
        "	MOV result.texcoord[0], v24;\n"
        "	MOV result.texcoord[1], v25;\n"
        "	MOV R1, v16;\n"
        "	MAD R1.y, v17.x, c4.x, R1.y;\n"
        "	DP4 R0.x, c0[0], R1;\n"
        "	DP4 R0.y, c0[1], R1;\n"
        "	DP4 R0.z, c0[2], R1;\n"
        "	DP4 R0.w, c0[3], R1;\n"
        "	MOV result.position, R0;\n"
        "	MOV result.color.front.primary, c6.x;\n"
        "	MUL R0.x, R0.z, c7.x;\n"
        "	MUL R0.zw, R0.x, R0.x;\n"
        "	MOV R0.xy, c7.y;\n"
        "	LIT R0.z, R0;\n"
        "	RCP result.fogcoord.x, R0.z;\n"
        "END\n";

    String TerrainVertexProgram::mNoFogVs_1_1 = 
        "vs_1_1\n"
        "def c5, 1, 1, 1, 1\n"
        "//var float4x4 worldViewProj :  : c[0], 4 : 8 : 1\n"
        "//var float morphFactor :  : c[4] : 9 : 1\n"
        "dcl_blendweight v1\n"
        "dcl_texcoord1 v8\n"
        "dcl_texcoord0 v7\n"
        "dcl_position v0\n"
        "	mov oT0.xy, v7\n"
        "	mov oT1.xy, v8\n"
        "	mov r0, v0\n"
        "	mad r0.y, v1.x, c4.x, r0.y\n"
        "	dp4 oPos.x, c0, r0\n"
        "	dp4 oPos.y, c1, r0\n"
        "	dp4 oPos.z, c2, r0\n"
        "	dp4 oPos.w, c3, r0\n"
        "	mov oD0, c5.x\n";
    String TerrainVertexProgram::mLinearFogVs_1_1 = 
        "vs_1_1\n"
        "def c5, 1, 1, 1, 1\n"
        "//var float4x4 worldViewProj :  : c[0], 4 : 9 : 1\n"
        "//var float morphFactor :  : c[4] : 10 : 1\n"
        "dcl_blendweight v1\n"
        "dcl_texcoord1 v8\n"
        "dcl_texcoord0 v7\n"
        "dcl_position v0\n"
        "	mov oT0.xy, v7\n"
        "	mov oT1.xy, v8\n"
        "	mov r1, v0\n"
        "	mad r1.y, v1.x, c4.x, r1.y\n"
        "	dp4 r0.x, c0, r1\n"
        "	dp4 r0.y, c1, r1\n"
        "	dp4 r0.z, c2, r1\n"
        "	dp4 r0.w, c3, r1\n"
        "	mov oFog, r0.z\n"
        "	mov oPos, r0\n"
        "	mov oD0, c5.x\n";

	String TerrainVertexProgram::mShadowReceiverVs_1_1 = 
		"vs_1_1\n"
		"def c13, 1, 1, 1, 1\n"
		"dcl_blendweight v1\n"
		"dcl_texcoord1 v8\n"
		"dcl_texcoord0 v7\n"
		"dcl_position v0\n"
		"mov r1, v0\n"
		"mad r1.y, v1.x, c12.x, r1.y\n"
		"dp4 oPos.x, c0, r1\n"
		"dp4 oPos.y, c1, r1\n"
		"dp4 oPos.z, c2, r1\n"
		"dp4 oPos.w, c3, r1\n"
		"dp4 r0.x, c4, r1\n"
		"dp4 r0.y, c5, r1\n"
		"dp4 r0.z, c6, r1\n"
		"dp4 r0.w, c7, r1\n"
		"dp4 r1.x, c8, r0\n"
		"dp4 r1.y, c9, r0\n"
		"dp4 r1.w, c11, r0\n"
		"rcp r0.x, r1.w\n"
		"mul oT0.xy, r1.xy, r0.x\n"
		"mov oD0, c13\n";
	String TerrainVertexProgram::mExpFogVs_1_1 = 
        "vs_1_1\n"
        "def c6, 1, 1, 1, 1\n"
        "def c7, 2.71828, 0, 0, 0\n"
        "//var float4x4 worldViewProj :  : c[0], 4 : 9 : 1\n"
        "//var float morphFactor :  : c[4] : 10 : 1\n"
        "//var float fogDensity :  : c[5] : 11 : 1\n"
        "dcl_blendweight v1\n"
        "dcl_texcoord1 v8\n"
        "dcl_texcoord0 v7\n"
        "dcl_position v0\n"
        "	mov oT0.xy, v7\n"
        "	mov oT1.xy, v8\n"
        "	mov r1, v0\n"
        "	mad r1.y, v1.x, c4.x, r1.y\n"
        "	dp4 r0.x, c0, r1\n"
        "	dp4 r0.y, c1, r1\n"
        "	dp4 r0.z, c2, r1\n"
        "	dp4 r0.w, c3, r1\n"
        "	mov oPos, r0\n"
        "	mov oD0, c6.x\n"
        "	mul r0.zw, r0.z, c5.x\n"
        "	mov r0.xy, c7.x\n"
        "	lit r0.z, r0\n"
        "	rcp oFog, r0.z\n";
    String TerrainVertexProgram::mExp2FogVs_1_1 = 
        "vs_1_1\n"
        "def c6, 1, 1, 1, 1\n"
        "def c7, 0.002, 2.71828, 0, 0\n"
        "//var float4x4 worldViewProj :  : c[0], 4 : 9 : 1\n"
        "//var float morphFactor :  : c[4] : 10 : 1\n"
        "//var float fogDensity :  : c[5] : 11 : 1\n"
        "dcl_blendweight v1\n"
        "dcl_texcoord1 v8\n"
        "dcl_texcoord0 v7\n"
        "dcl_position v0\n"
        "	mov oT0.xy, v7\n"
        "	mov oT1.xy, v8\n"
        "	mov r1, v0\n"
        "	mad r1.y, v1.x, c4.x, r1.y\n"
        "	dp4 r0.x, c0, r1\n"
        "	dp4 r0.y, c1, r1\n"
        "	dp4 r0.z, c2, r1\n"
        "	dp4 r0.w, c3, r1\n"
        "	mov oPos, r0\n"
        "	mov oD0, c6.x\n"
        "	mul r0.x, r0.z, c7.x\n"
        "	mul r0.zw, r0.x, r0.x\n"
        "	mov r0.xy, c7.y\n"
        "	lit r0.z, r0\n"
        "	rcp oFog, r0.z\n";

    const String& TerrainVertexProgram::getProgramSource(
        FogMode fogMode, const String syntax, bool shadowReceiver)
    {
		if (shadowReceiver)
		{
			if (syntax == "arbvp1")
			{
				return mShadowReceiverArbvp1;
			}
			else
			{
				return mShadowReceiverVs_1_1;
			}
		}
		else
		{

			switch(fogMode)
			{
			case FOG_NONE:
				if (syntax == "arbvp1")
				{
					return mNoFogArbvp1;
				}
				else
				{
					return mNoFogVs_1_1;
				}
				break;
			case FOG_LINEAR:
				if (syntax == "arbvp1")
				{
					return mLinearFogArbvp1;
				}
				else
				{
					return mLinearFogVs_1_1;
				}
				break;
			case FOG_EXP:
				if (syntax == "arbvp1")
				{
					return mExpFogArbvp1;
				}
				else
				{
					return mExpFogVs_1_1;
				}
				break;
			case FOG_EXP2:
				if (syntax == "arbvp1")
				{
					return mExp2FogArbvp1;
				}
				else
				{
					return mExp2FogVs_1_1;
				}
				break;
			};
		}
        // default
        return StringUtil::BLANK;

    }
}