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source: data/branches/altaudio/materials/programs/Radial_Blur_FP.cg @ 8600

Last change on this file since 8600 was 5312, checked in by landauf, 16 years ago

added shaders (compositors, materials, cg programs and textures)

  • Property svn:eol-style set to native
File size: 1.4 KB
Line 
1//------------------------------------------------------
2//Radial_Blur_FP.cg
3//  Implements radial blur to be used with the compositor
4//  It's very dependant on screen resolution
5//------------------------------------------------------
6
7uniform sampler tex: register(s0);
8
9static const float samples[10] =
10{
11-0.08,
12-0.05,
13-0.03,
14-0.02,
15-0.01,
160.01,
170.02,
180.03,
190.05,
200.08
21};
22
23float4 main(float2 texCoord: TEXCOORD0,
24            uniform float sampleDist,
25            uniform float sampleStrength
26           ) : COLOR
27{
28   //Vector from pixel to the center of the screen
29   float2 dir = 0.5 - texCoord;
30
31   //Distance from pixel to the center (distant pixels have stronger effect)
32   //float dist = distance( float2( 0.5, 0.5 ), texCoord );
33   float dist = sqrt( dir.x*dir.x + dir.y*dir.y );
34
35
36   //Now that we have dist, we can normlize vector
37   dir = normalize( dir );
38
39   //Save the color to be used later
40   float4 color = tex2D( tex, texCoord );
41
42   //Average the pixels going along the vector
43   float4 sum = color;
44   for (int i = 0; i < 10; i++)
45   {
46      sum += tex2D( tex, texCoord + dir * samples[i] * sampleDist );
47   }
48   sum /= 11;
49
50   //Calculate amount of blur based on
51   //distance and a strength parameter
52   float t = dist * sampleStrength;
53   t = saturate( t );//We need 0 <= t <= 1
54
55   //Blend the original color with the averaged pixels
56   return lerp( color, sum, t );
57}
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