//  STATIC: "VERTEXCOLOR"			"0..1"
//	STATIC: "CUBEMAP"				"0..1"
//  STATIC: "HALFLAMBERT"			"0..1"
//  STATIC: "FLASHLIGHT"			"0..1"
//	DYNAMIC: "LIGHT_COMBO"			"0..21"
//	DYNAMIC: "DOWATERFOG"			"0..1"
//	DYNAMIC: "NUM_BONES"			"0..3"
//  DYNAMIC: "LIGHTING_PREVIEW"		"0..1"

#include "common_vs_fxc.h"

 
#ifdef USE_CONDITIONALS
const bool g_bZeroBones : register( b0 );
const bool g_bOneBone   : register( b1 );
const bool g_bTwoBones  : register( b2 );
#else
static const int g_NumBones			= NUM_BONES;
#endif

static const int  g_LightCombo		= LIGHT_COMBO;
static const int  g_FogType			= DOWATERFOG;
static const bool g_bVertexColor	= VERTEXCOLOR ? true : false;
static const bool g_bCubemap		= CUBEMAP ? true : false;
static const bool g_bFlashlight		= FLASHLIGHT ? true : false;
static const bool g_bHalfLambert	= HALFLAMBERT ? true : false;

static const int g_StaticLightType	= g_StaticLightTypeArray[g_LightCombo];
static const int g_AmbientLightType = g_AmbientLightTypeArray[g_LightCombo];
static const int g_LocalLightType0	= g_LocalLightType0Array[g_LightCombo];
static const int g_LocalLightType1	= g_LocalLightType1Array[g_LightCombo];

const float4 cBaseTexCoordTransform[2]			:  register( SHADER_SPECIFIC_CONST_0 );
const float4 cDetailTexCoordTransform[2]		:  register( SHADER_SPECIFIC_CONST_2 );
// FIXME: don't need none of this!
const float4 cEnvmapMaskTexCoordTransform[2]	:  register( SHADER_SPECIFIC_CONST_4 );

struct VS_INPUT
{
	// This is all of the stuff that we ever use.
	float4 vPos				: POSITION;
	float4 vBoneWeights		: BLENDWEIGHT;
	float4 vBoneIndices		: BLENDINDICES;
	float3 vNormal			: NORMAL;
	float4 vColor			: COLOR0;
	float3 vSpecular		: COLOR1;
	// make these float2's and stick the [n n 0 1] in the dot math.
	float4 vTexCoord0		: TEXCOORD0;
	float4 vTexCoord1		: TEXCOORD1;
	float4 vTexCoord2		: TEXCOORD2;
	float4 vTexCoord3		: TEXCOORD3;

	// Position and normal/tangent deltas
	float3 vPosFlex			: POSITION1;
	float3 vNormalFlex		: NORMAL1;
};

struct VS_OUTPUT
{
    float4 projPos					: POSITION;			// Projection-space position	
	float  fog						: FOG;

	HALF2 baseTexCoord				: TEXCOORD0;		// Base texture coordinate
	HALF2 detailTexCoord			: TEXCOORD1;		// Detail texture coordinate
	float4 color					: TEXCOORD2;		// Vertex color (from lighting or unlit)

#if CUBEMAP
	float3 worldVertToEyeVector		: TEXCOORD3;		// Necessary for cubemaps
#endif
#if CUBEMAP || FLASHLIGHT || LIGHTING_PREVIEW
	float3 worldSpaceNormal			: TEXCOORD4;		// Necessary for cubemaps and flashlight
#endif

	float4 worldPos_projPosZ		: TEXCOORD7;		// Necessary for water fog dest alpha
	float4 fogFactorW				: COLOR1;
};


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

	float4 vPosition = v.vPos;
	float3 vNormal   = v.vNormal;

	// Flexes coming in from a separate stream (contribution masked by cFlexScale.x)
	vPosition.xyz += v.vPosFlex    * cFlexScale.x;
	vNormal       += v.vNormalFlex * cFlexScale.x;

	// Perform skinning
	float3 worldNormal, worldPos;
	SkinPositionAndNormal( 
		g_NumBones, 
		vPosition, vNormal,
		v.vBoneWeights, v.vBoneIndices,
		worldPos, worldNormal );

	if ( !g_bVertexColor )
	{
		worldNormal = normalize( worldNormal );
	}

#if CUBEMAP || FLASHLIGHT || LIGHTING_PREVIEW
	o.worldSpaceNormal = worldNormal;
#endif

	// Transform into projection space
	float4 projPos = mul( float4( worldPos, 1 ), cViewProj );
	o.projPos = projPos;
	o.fogFactorW.w = o.fog = CalcFog( worldPos, projPos, g_FogType );

	// Needed for water fog alpha; 
	// FIXME: we shouldn't have to compute this all thie time.
	o.worldPos_projPosZ = float4( worldPos.xyz, projPos.z );

	// Needed for cubemaps 
#if CUBEMAP
	o.worldVertToEyeVector.xyz = VSHADER_VECT_SCALE * (cEyePos - worldPos);
#endif

	if( g_bFlashlight )
	{
		o.color = float4( 0.0f, 0.0f, 0.0f, 0.0f );
	}
	else
	{
		if ( g_bVertexColor )
		{
			// Assume that this is unlitgeneric if you are using vertex color.
			o.color.rgb = GammaToLinear( v.vColor.rgb );
			o.color.a = v.vColor.a;
		}
		else
		{
			// Compute vertex lighting
			o.color.xyz = DoLighting( worldPos, worldNormal, v.vSpecular,
				g_StaticLightType, g_AmbientLightType, g_LocalLightType0, g_LocalLightType1, 1.0f, g_bHalfLambert );
		}
	}

	// Base texture coordinates
	o.baseTexCoord.x = dot( v.vTexCoord0, cBaseTexCoordTransform[0] );
	o.baseTexCoord.y = dot( v.vTexCoord0, cBaseTexCoordTransform[1] );

	// Detail texture coordinates
	// FIXME: This shouldn't have to be computed all the time.
	o.detailTexCoord.x = dot( v.vTexCoord0, cDetailTexCoordTransform[0] );
	o.detailTexCoord.y = dot( v.vTexCoord0, cDetailTexCoordTransform[1] );
#if LIGHTING_PREVIEW
	float dot=0.5+0.5*worldNormal*float3(0.7071,0.7071,0);
	o.color.xyz=float3(dot,dot,dot);
#endif


//	o.color.xyz = vNormal * 0.5f + 0.5f;


	return o;
}