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change scanline filter.

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git-svn-id: svn://qnap.local/TwoTerm/trunk@2004 5590a31f-7b70-45f8-8c82-aa3a8e5f4507
This commit is contained in:
Kelvin Sherlock
2011-01-20 23:24:03 +00:00
parent 480d7ef93a
commit 04d96f94ce
3 changed files with 23 additions and 17 deletions
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24
ScanLineFilter.cikernel
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@@ -3,17 +3,23 @@
*
*/
kernel vec4 scanline(sampler image, float opacity)
kernel vec4 scanline(sampler image, float strength)
{
vec2 coord = samplerCoord(image);
vec4 fudge = vec4( 0.4, 0.4, 0.4, 0.0 );
vec2 coord = samplerCoord(image);
vec4 pixel = sample(image, coord);
float isOdd = mod(floor(coord.y), 2.0);
// isOdd == 0 --> return pixel
// isOdd == 1 --> return pixel * opacity
//float multiplier = compare(isOdd - 1.0, 1.0, opacity);
float multiplier = isOdd == 0.0 ? 1.0 : opacity;
return pixel * multiplier;
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);
}