//	STATIC: "ENVMAP_MASK"			"0..1"
//	STATIC: "TANGENTSPACE"			"0..1"
//  STATIC: "BUMPMAP"				"0..1"
//  STATIC: "DIFFUSEBUMPMAP"		"0..1"
//  STATIC: "VERTEXCOLOR"			"0..1"
//  STATIC: "VERTEXALPHATEXBLENDFACTOR" "0..1"

//  DYNAMIC: "FASTPATH"				"0..1"
//	DYNAMIC: "DOWATERFOG"				"0..1"
//  DYNAMIC: "LIGHTING_PREVIEW"          "0..1"

// This should not be a combo since I'm a moron with the tangent space and the flashlight.
#include "common_vs_fxc.h"

//  SKIP: !$BUMPMAP && $DIFFUSEBUMPMAP

static const int g_FogType					= DOWATERFOG;
static const bool g_UseSeparateEnvmapMask	= ENVMAP_MASK;
static const bool g_bTangentSpace		= TANGENTSPACE;
static const bool g_bBumpmap				= BUMPMAP;
static const bool g_bBumpmapDiffuseLighting	= DIFFUSEBUMPMAP;
static const bool g_bVertexColor			= VERTEXCOLOR;
static const bool g_bVertexAlphaTexBlendFactor	= VERTEXALPHATEXBLENDFACTOR;

const float4 cBaseTexCoordTransform[2]			:  register( SHADER_SPECIFIC_CONST_0 );
const float4 cDetailOrBumpTexCoordTransform[2]	:  register( SHADER_SPECIFIC_CONST_2 );
// This should be identity if we are bump mapping, otherwise we'll screw up the lightmapTexCoordOffset.
const float4 cEnvmapMaskTexCoordTransform[2]	:  register( SHADER_SPECIFIC_CONST_4 );
const float4 cBlendMaskTexCoordTransform[2]     :  register( SHADER_SPECIFIC_CONST_6 );

struct VS_INPUT
{
	float3 vPos							: POSITION;
	float3 vNormal						: NORMAL;
	float2 vBaseTexCoord				: TEXCOORD0;
	float2 vLightmapTexCoord			: TEXCOORD1;
	float2 vLightmapTexCoordOffset		: TEXCOORD2;
	float3 vTangentS					: TANGENT;
	float3 vTangentT					: BINORMAL;
	float4 vColor						: COLOR0;
};

struct VS_OUTPUT
{
    float4 projPos					: POSITION;	
	float  fog						: FOG;
	float2 baseTexCoord				: TEXCOORD0;
	// detail textures and bumpmaps are mutually exclusive so that we have enough texcoords.
	float4 detailOrBumpAndEnvmapMaskTexCoord : TEXCOORD1;
	float4 lightmapTexCoord1And2	: TEXCOORD2;
	float4 lightmapTexCoord3		: TEXCOORD3;			// and basetexcoord*mask_scale
	float4 worldPos_projPosZ		: TEXCOORD4;

#if TANGENTSPACE || (LIGHTING_PREVIEW)
	float3x3 tangentSpaceTranspose	: TEXCOORD5;	// and 6 and 7
#endif

	float4 vertexColor				: COLOR;
	float4 vertexBlendX_fogFactorW	: COLOR1;
};

VS_OUTPUT main( const VS_INPUT v )
{
	VS_OUTPUT o = ( VS_OUTPUT )0;

	float4 projPos;
	float3 worldPos;

	projPos = mul( float4( v.vPos, 1 ), cModelViewProj );
	o.projPos = projPos;

	worldPos = mul( float4( v.vPos, 1 ), cModel[0] );
	
#if DOWATERFOG
	o.worldPos_projPosZ = float4( worldPos, projPos.z );
#else
	o.worldPos_projPosZ = float4( worldPos, projPos.x );
#endif
	
#if TANGENTSPACE || (LIGHTING_PREVIEW)
	float3 worldTangentS = mul( v.vTangentS, ( const float3x3 )cModel[0] );
	float3 worldTangentT = mul( v.vTangentT, ( const float3x3 )cModel[0] );
	float3 worldNormal = mul( v.vNormal, ( float3x3 )cModel[0] );

	o.tangentSpaceTranspose[0] = worldTangentS;
	o.tangentSpaceTranspose[1] = worldTangentT;
	o.tangentSpaceTranspose[2] = worldNormal;
#endif

	float3 worldVertToEyeVector = VSHADER_VECT_SCALE * (cEyePos - worldPos);

#if FASTPATH

	o.baseTexCoord.xy = v.vBaseTexCoord;
	o.detailOrBumpAndEnvmapMaskTexCoord.xy = v.vBaseTexCoord.xy;
	o.lightmapTexCoord3.zw = v.vBaseTexCoord;
#else

	o.baseTexCoord.x = dot( v.vBaseTexCoord, cBaseTexCoordTransform[0] ) + cBaseTexCoordTransform[0].w;
	o.baseTexCoord.y = dot( v.vBaseTexCoord, cBaseTexCoordTransform[1] ) + cBaseTexCoordTransform[1].w;
	o.detailOrBumpAndEnvmapMaskTexCoord.x = dot( v.vBaseTexCoord, cDetailOrBumpTexCoordTransform[0] ) + cDetailOrBumpTexCoordTransform[0].w;
	o.detailOrBumpAndEnvmapMaskTexCoord.y = dot( v.vBaseTexCoord, cDetailOrBumpTexCoordTransform[1] ) + cDetailOrBumpTexCoordTransform[1].w;
	o.lightmapTexCoord3.z = dot( v.vBaseTexCoord, cBlendMaskTexCoordTransform[0] ) + cBlendMaskTexCoordTransform[0].w;
	o.lightmapTexCoord3.w = dot( v.vBaseTexCoord, cBlendMaskTexCoordTransform[1] ) + cBlendMaskTexCoordTransform[1].w;
#endif
	
	//  compute lightmap coordinates
	if( g_bBumpmap && g_bBumpmapDiffuseLighting )
	{
		o.lightmapTexCoord1And2.xy = v.vLightmapTexCoord + v.vLightmapTexCoordOffset;

		float2 lightmapTexCoord2 = o.lightmapTexCoord1And2.xy + v.vLightmapTexCoordOffset;
		float2 lightmapTexCoord3 = lightmapTexCoord2 + v.vLightmapTexCoordOffset;

		// reversed component order
		o.lightmapTexCoord1And2.w = lightmapTexCoord2.x;
		o.lightmapTexCoord1And2.z = lightmapTexCoord2.y;

		o.lightmapTexCoord3.xy = lightmapTexCoord3;
	}
	else
	{
		o.lightmapTexCoord1And2.xy = v.vLightmapTexCoord;
	}

	if( g_UseSeparateEnvmapMask )
	{
		// reversed component order
#	if FASTPATH
		o.detailOrBumpAndEnvmapMaskTexCoord.wz = v.vBaseTexCoord.xy;
#	else
		o.detailOrBumpAndEnvmapMaskTexCoord.w = dot( v.vBaseTexCoord, cEnvmapMaskTexCoordTransform[0] ) + cEnvmapMaskTexCoordTransform[0].w;
		o.detailOrBumpAndEnvmapMaskTexCoord.z = dot( v.vBaseTexCoord, cEnvmapMaskTexCoordTransform[1] ) + cEnvmapMaskTexCoordTransform[1].w;
#	endif
	}

	o.vertexBlendX_fogFactorW = o.fog = CalcFog( worldPos, projPos, g_FogType );

	if (!g_bVertexColor)
	{
#if FASTPATH
		o.vertexColor = float4( 1.0f, 1.0f, 1.0f, 1.0f );
#else
		o.vertexColor = cModulationColor;
#endif
	}
	else
	{
#if FASTPATH
		o.vertexColor = v.vColor;
#else
		if ( g_bVertexAlphaTexBlendFactor )
		{
			o.vertexColor.rgb = v.vColor.rgb * cModulationColor.rgb;
			o.vertexColor.a = cModulationColor.a;
		}
		else
		{
			o.vertexColor = v.vColor * cModulationColor;
		}
#endif
	}

	if ( g_bVertexAlphaTexBlendFactor )
	{
		o.vertexBlendX_fogFactorW.r = v.vColor.a;
	}
	
	return o;
}