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

VS_OUT DepthVS(float4 position : POSITION,	
				uniform float4x4 worldViewProj)
{
  
  VS_OUT OUT;
 
  OUT.hPosition = mul(worldViewProj, position);
  OUT.Position = mul(worldViewProj, position);
  
  return OUT;
}

//for directional light
float4 DepthPS(VS_OUT IN ):COLOR
{
//return 1;
	float4 pos = (IN.Position / IN.Position.w);
	//pos = (pos +1.0 ) / 2.0;
	return float4(pos.z, pos.z * pos.z, 1, 1);	
}

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

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

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

/*
float4 depthShadowPS(VS_OUT_SHADOW IN,
					uniform float4x4 lightViewProj,
					uniform sampler2D depthShadowMap : register(s0)
					):COLOR
{	
	float bias = 0.0001;
	float4 light = float4(1,1,1,1);
	float4 shadow = float4(0.6,0.6,0.6,1);
	
	float4 pos = (IN.lPosition / IN.lPosition.w);
	pos.xy = (pos.xy +1.0 ) / 2.0;
	pos.y = 1.0 - pos.y;
	float4 storedDepth = tex2D(depthShadowMap, pos.xy);
	
	if(storedDepth.r + bias < pos.z)
	{
		float M1 = storedDepth.r;
		float M2 = storedDepth.g;
		float v2 = M2 - M1 * M1;
		float pmax = v2 / (v2 + pow(M1 - pos.z, 2));
		light = shadow + (1 - shadow) * pmax;
		
		//light = shadow;
	}
	//return abs( pos.z - storedDepth.z );	
	return light;	
}
*/


float4 depthShadowPS(VS_OUT_SHADOW IN,
					uniform float4x4 lightViewProj,
					uniform sampler2D depthShadowMap : register(s0)
					):COLOR
{	
	float bias = 0.0001;
	float4 light = float4(1,1,1,1);
	float4 shadow = float4(0.65,0.65,0.65,1);
	//float4 shadow = float4(0,0,0,1);
	
	if(IN.lPosition.z > 0.0)
	{
		float4 pos = (IN.lPosition / IN.lPosition.w);
		pos.xy = (pos.xy + 1.0) / 2.0;
	
	
		pos.y = 1.0 - pos.y;
		float4 storedDepth = tex2D(depthShadowMap, pos.xy);
	
		if(storedDepth.r + bias < pos.z)
		{		
			light = shadow;
		}
		//if(length(pos.xy)>1)
		//		light = shadow;
	}
	
	
	return light;	
}