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updated ScanLine Filter

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git-svn-id: svn://qnap.local/TwoTerm/trunk@2012 5590a31f-7b70-45f8-8c82-aa3a8e5f4507
This commit is contained in:
Kelvin Sherlock 2011-02-03 02:37:12 +00:00
parent f18c3a6284
commit ce666ed1ba
1 changed files with 12 additions and 13 deletions
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25
ScanLineFilter.cikernel
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@ -3,23 +3,22 @@
*
*/
kernel vec4 scanline(sampler image, float strength)
kernel vec4 scanline(sampler image, float l, float d)
{
vec4 fudge = vec4( 0.4, 0.4, 0.4, 0.0 );
vec4 light, dark;
vec2 coord = samplerCoord(image);
vec4 pixel = sample(image, coord);
fudge *= strength;
float yy = mod(coord.y, 2.0);
fudge *= (yy < 1.0) ? 1.0 : -1.0;
pixel = unpremultiply(pixel);
pixel += fudge;
return premultiply(pixel);
light = dark = pixel;
dark.rgb = pixel.rgb * (1.0 - d);
light.rgb = pixel.rgb * (1.0 - l) + l;
pixel.rgb = mod(coord.y, 2.0) < 1.0 ? light.rgb : dark.rgb;
return premultiply(pixel);
}