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//texture PrevFrameImage;
//sampler2D sampler_main = sampler_state { Texture = <PrevFrameImage>; };
//float4 _c0; // source texsize (.xy), and inverse (.zw)
//float4 _c1; // w1..w4
//float4 _c2; // d1..d4
//float4 _c3; // scale, bias, w_div
void PS( float2 uv : TEXCOORD,
out float4 ret : COLOR0 )
{
// LONG HORIZ. PASS 1:
//const float w[8] = { 4.0, 3.8, 3.5, 2.9, 1.9, 1.2, 0.7, 0.3 }; <- user can specify these
//const float w1 = w[0] + w[1];
//const float w2 = w[2] + w[3];
//const float w3 = w[4] + w[5];
//const float w4 = w[6] + w[7];
//const float d1 = 0 + 2*w[1]/w1;
//const float d2 = 2 + 2*w[3]/w2;
//const float d3 = 4 + 2*w[5]/w3;
//const float d4 = 6 + 2*w[7]/w4;
//const float w_div = 0.5/(w1+w2+w3+w4);
#define srctexsize _c0
#define w1 _c1.x
#define w2 _c1.y
#define w3 _c1.z
#define w4 _c1.w
#define d1 _c2.x
#define d2 _c2.y
#define d3 _c2.z
#define d4 _c2.w
#define fscale _c3.x
#define fbias _c3.y
#define w_div _c3.z
// note: if you just take one sample at exactly uv.xy, you get an avg of 4 pixels.
//float2 uv2 = uv.xy;// + srctexsize.zw*float2(0.5,0.5);
float2 uv2 = uv.xy + srctexsize.zw*float2(1,1); // + moves blur UP, LEFT by 1-pixel increments
float3 blur =
( tex2D( sampler_main, uv2 + float2( d1*srctexsize.z,0) ).xyz
+ tex2D( sampler_main, uv2 + float2(-d1*srctexsize.z,0) ).xyz)*w1 +
( tex2D( sampler_main, uv2 + float2( d2*srctexsize.z,0) ).xyz
+ tex2D( sampler_main, uv2 + float2(-d2*srctexsize.z,0) ).xyz)*w2 +
( tex2D( sampler_main, uv2 + float2( d3*srctexsize.z,0) ).xyz
+ tex2D( sampler_main, uv2 + float2(-d3*srctexsize.z,0) ).xyz)*w3 +
( tex2D( sampler_main, uv2 + float2( d4*srctexsize.z,0) ).xyz
+ tex2D( sampler_main, uv2 + float2(-d4*srctexsize.z,0) ).xyz)*w4
;
blur.xyz *= w_div;
blur.xyz = blur.xyz*fscale + fbias;
ret.xyz = blur;
ret.w = 1;
//ret.xyzw = tex2D(sampler_main, uv + 0*srctexsize.zw);
}
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