// STATIC: "ONLY_PROJECT_POSITION"	"0..1" [XBOX]
// STATIC: "ONLY_PROJECT_POSITION"	"0..0" [PC]
// STATIC: "TREESWAY"				"0..2"

// DYNAMIC: "COMPRESSED_VERTS"		"0..1"
// DYNAMIC: "SKINNING"				"0..1"

// DYNAMIC: "MORPHING"				"0..1" [vs30] [ = pShaderAPI->IsHWMorphingEnabled() ]
// DYNAMIC: "TESSELLATION"			"0..2"	[vs30] [PC]
// DYNAMIC: "TESSELLATION"			"0..0"	[XBOX]
// DYNAMIC: "TESSELLATION"			"0..0"	[vs20] [PC]

//	SKIP: ( $MORPHING || $SKINNING || $COMPRESSED_VERTS ) && $TESSELLATION

#include "common_vs_fxc.h"

static const bool g_bSkinning = SKINNING ? true : false;

#ifdef SHADER_MODEL_VS_3_0
// NOTE: cMorphTargetTextureDim.xy = target dimensions,
//		 cMorphTargetTextureDim.z = 4tuples/morph
const float3 cMorphTargetTextureDim			: register( SHADER_SPECIFIC_CONST_6 );
const float4 cMorphSubrect					: register( SHADER_SPECIFIC_CONST_7 );

sampler2D morphSampler						: register( D3DVERTEXTEXTURESAMPLER0, s0 );
#endif

#if ( TREESWAY )
	const float4 g_vTreeSwayParams0			: register( SHADER_SPECIFIC_CONST_2 );
	const float4 g_vTreeSwayParams1			: register( SHADER_SPECIFIC_CONST_3 );
	const float4 g_vTreeSwayParams2			: register( SHADER_SPECIFIC_CONST_4 );
	const float4 g_vTreeSwayParams3			: register( SHADER_SPECIFIC_CONST_5 );
	const float4 g_vTreeSwayParams4			: register( SHADER_SPECIFIC_CONST_9 );

	#define g_flTime				g_vTreeSwayParams0.x
	#define g_vWindDir				g_vTreeSwayParams0.yz

	#define g_flScrumbleFalloffCurve g_vTreeSwayParams1.x
	#define g_flSwayFalloffCurve	g_vTreeSwayParams1.y
	#define g_flScrumbleSpeed		g_vTreeSwayParams1.z
	#define g_flFastSwaySpeedScale	g_vTreeSwayParams1.w


	#define g_flHeight				g_vTreeSwayParams2.x
	#define g_flStartHeight			g_vTreeSwayParams2.y
	#define g_flRadius				g_vTreeSwayParams2.z
	#define g_flStartRadius			g_vTreeSwayParams2.w

	#define g_flSwaySpeed			g_vTreeSwayParams3.x
	#define g_flSwayIntensity		g_vTreeSwayParams3.y
	#define g_flScrumbleWaveCount	g_vTreeSwayParams3.z
	#define g_flScrumbleIntensity	g_vTreeSwayParams3.w

	#define g_flWindSpeedLerpStart	g_vTreeSwayParams4.x
	#define g_flWindSpeedLerpEnd	g_vTreeSwayParams4.y
#endif

#if TESSELLATION

#include "tessellation_vs_fxc.h"

const float4 g_SubDControls					: register( SHADER_SPECIFIC_CONST_8 );
sampler2D BezierSampler						: register( s1 );
sampler2D DispSampler						: register( s2 );
// VS_INPUT defined in header

#else // no TESSELLATION

struct VS_INPUT
{
	float4 vPos					: POSITION;
	float2 vTexCoord			: TEXCOORD0;
	float4 vBoneWeights			: BLENDWEIGHT;
	float4 vBoneIndices			: BLENDINDICES;
	// Position delta stream
	float3 vPosFlex				: POSITION1;
#ifdef SHADER_MODEL_VS_3_0
	float vVertexID				: POSITION2;
#endif
};

#endif // TESSELLATION

struct VS_OUTPUT
{
    float4 projPos				: POSITION;

#if (ONLY_PROJECT_POSITION == 0) //360 sometimes runs without the pixel shader component, but has to patch this output if it does.
	float2 texCoord				: TEXCOORD0;
#endif
};

#include "tree_sway.h"

VS_OUTPUT main( const VS_INPUT v )
{
	VS_OUTPUT o = ( VS_OUTPUT )0;
	float3 worldPos;

	#if ( TESSELLATION )
	{
		float2 detailUV, baseUV;
		float3 worldNormal, worldTangentS, worldTangentT;
		EvaluateSubdivisionSurface( v, g_SubDControls.x, g_SubDControls.y, g_SubDControls.z, BezierSampler, DispSampler, worldNormal, worldPos, baseUV, detailUV );

		#if (ONLY_PROJECT_POSITION == 0)
		{
			o.texCoord = baseUV;
		}
		#endif
	}
	#else // not tessellating
	{
		float4 vPosition = v.vPos;

		#if ( !defined( SHADER_MODEL_VS_3_0 ) || !MORPHING )
		{
			ApplyMorph( v.vPosFlex, vPosition.xyz );
		}
		#else
		{
			ApplyMorph( morphSampler, cMorphTargetTextureDim, cMorphSubrect, v.vVertexID, float3(0, 0, 0), vPosition.xyz );
		}
		#endif
	  
		#if ( TREESWAY )
		{
			vPosition.xyz = ComputeTreeSway( vPosition.xyz, g_flTime );
		}
		#endif

		SkinPosition( g_bSkinning, vPosition, v.vBoneWeights, v.vBoneIndices, worldPos );

		#if ( ONLY_PROJECT_POSITION == 0 )
		{
			o.texCoord = v.vTexCoord;
		}
		#endif
	}
	#endif

	o.projPos = mul( float4( worldPos, 1.0f ), cViewProj );

	return o;
}