///////depth map
struct VS_OUT
{
	float4 hPosition	: POSITION;
	float4 Position	: TEXCOORD0;
};

VS_OUT hDepthVS(float4 position : POSITION,	
		uniform float4x4 worldView,
		uniform float4x4 worldViewProj)
{
  
  VS_OUT OUT;
  OUT.hPosition = mul(worldViewProj, position);
  OUT.Position = mul(worldView, position);
  OUT.Position.z *= -1.0;
  return OUT;
}



float4 DepthPS(VS_OUT IN ):COLOR
{
	float dist = length(IN.Position.xyz);
	return float4(dist, dist, dist, 1);
	//return 1;	
}

///////////////Shadow

struct VS_OUT_SHADOW
{
	float4 hPosition	: POSITION;
	float4 Position		: TEXCOORD0;
	float4 cPosition	: TEXCOORD1;
};

VS_OUT_SHADOW depthShadowVS(float4 position : POSITION,	
		uniform float4x4 world,
		uniform float4x4 worldView,
		uniform float4x4 worldViewProj)
{
  VS_OUT_SHADOW OUT;
  OUT.hPosition = mul(worldViewProj, position);
  OUT.Position = mul(world, position);
  OUT.cPosition = mul(worldView, position);
  return OUT;
}


float4 depthShadowPS(VS_OUT_SHADOW IN,
					uniform float4x4 lightView,
					uniform float4x4 lightViewProj,
					uniform float4x4 lightView2,
					uniform float4x4 lightViewProj2,
					uniform sampler2D depthShadowMap : register(s0),
					uniform sampler2D depthShadowMap2 : register(s1)):COLOR
{					
	float bias = 0.06;
	float4 shadowColor = float4(0.6, 0.6, 0.6, 1.0);

	float4 light1 = float4(1,1,1,1);
	
	float4 lightCamPos1 = mul(lightView, IN.Position);
	float d1 = length(lightCamPos1.xyz);	
	float4 lightScreenPos1 = mul(lightViewProj, IN.Position);
	lightScreenPos1 = lightScreenPos1 / lightScreenPos1.w ;	
	lightScreenPos1 = ( lightScreenPos1 + 1.0 ) / 2.0;
	lightScreenPos1.y = 1.0 - lightScreenPos1.y;
	float4 storedDepth1 = tex2D(depthShadowMap, lightScreenPos1.xy);
		if(storedDepth1.r + bias < d1)
			light1 = shadowColor;	
	
	
	return light1;	
}