Chao7

struct pixelShaderInput{    float4 Diffuse             : COLOR0;    float2 ShadowMapProjection : TEXCOORD0;    float  LightSpaceDepth     : TEXCOORD1;};sampler2D ShadowMapSampler;#define SM_SIZE 2048float4 ps_LightPassBilin4x4PCF( pixelShaderInput Input ) : COLOR0{    float4   shadowMapVals[4];    float4   shadowMapWeights[4];    float2  shadowFractMap[4]={        { -(1/SM_SIZE), -(1/SM_SIZE) },        {  (1/SM_SIZE), -(1/SM_SIZE) },        { -(1/SM_SIZE),  (1/SM_SIZE) },        {  (1/SM_SIZE),  (1/SM_SIZE) }    };    //fetch 4 2x2 quads    shadowMapVals[0] = tex2D(ShadowMapSampler, Input.ShadowMapProjection + shadowFractMap[0] );    shadowMapVals[1] = tex2D(ShadowMapSampler, Input.ShadowMapProjection + shadowFractMap[1] );    shadowMapVals[2] = tex2D(ShadowMapSampler, Input.ShadowMapProjection + shadowFractMap[2] );    shadowMapVals[3] = tex2D(ShadowMapSampler, Input.ShadowMapProjection + shadowFractMap[3] );    //fraction component of projected coordinates; here 1024 represents the shadowmap size    // float4 pFrac = frac( Input.ShadowMapProjection * float4( SM_SIZE, SM_SIZE, 0, 0 ) );    float2 pFrac = frac( Input.ShadowMapProjection.xy * float2( SM_SIZE, SM_SIZE ) ); // shaves 2 instructions//	/*    shadowMapWeights[0]  = float4( 1,          1-pFrac.x, 1,       1-pFrac.x );    shadowMapWeights[0] *= float4( 1-pFrac.y,  1,         1,       1-pFrac.y );    shadowMapWeights[1]  = float4( pFrac.x,    1,         pFrac.x, 1         );    shadowMapWeights[1] *= float4( 1-pFrac.y,  1,         1,       1-pFrac.y );    shadowMapWeights[2]  = float4( 1,          1-pFrac.x, 1,       1-pFrac.x );    shadowMapWeights[2] *= float4( 1,          pFrac.y,   pFrac.y, 1         );    shadowMapWeights[3]  = float4( pFrac.x,    1,         pFrac.x, 1         );    shadowMapWeights[3] *= float4( 1,          pFrac.y,   pFrac.y, 1         );//	*/	/* compiler already opts to    shadowMapWeights[0]  = float4( 1-pFrac.y,             1-pFrac.x,             1,                 (1-pFrac.x) * (1-pFrac.y) );    shadowMapWeights[1]  = float4( pFrac.x * (1-pFrac.y), 1,                     pFrac.x,           1-pFrac.y                 );    shadowMapWeights[2]  = float4( 1,                     (1-pFrac.x) * pFrac.y, pFrac.y,           1-pFrac.x                 );    shadowMapWeights[3]  = float4( pFrac.x,               pFrac.y,               pFrac.x * pFrac.y, 1                         );	*/    // projective distance from z plane in view coords    //float dist = Input.LightSpaceDepth - 0.005;	float fDepth = Input.LightSpaceDepth - 0.005;    float4 inLight;	float percentInLight;	inLight = ( fDepth < shadowMapVals[0] );    percentInLight  = dot(inLight, shadowMapWeights[0]);    inLight = ( fDepth < shadowMapVals[1] );    percentInLight += dot(inLight, shadowMapWeights[1]);    inLight = ( fDepth < shadowMapVals[2] );    percentInLight += dot(inLight, shadowMapWeights[2]);    inLight = ( fDepth < shadowMapVals[3] );    percentInLight += dot(inLight, shadowMapWeights[3]);    // (goboTexCoord, lightDist, lightVector, surfaceNormal)        //sum of weights is 9  since border taps are bilinearly filtered    //return ( (1.0f/9.0f) * percentInLight) * Input.Diffuse + float4( 0.25, 0.25, 0.25, 1.0 );	return ( (1.0f/9.0f) * percentInLight) * Input.Diffuse + float4( 0.25, 0.25, 0.25, 1.0 );}