kwin/lanczos-fragment.glsl
Martin Gräßlin 78c4c7a86e Lanczos filter available in GLES.
It uses a default vertex shader, so the existing shader can be dropped.
2011-01-30 14:12:04 +01:00

16 lines
427 B
GLSL

uniform sampler2D texUnit;
uniform vec2 offsets[25];
uniform vec4 kernel[25];
varying vec2 varyingTexCoords;
void main(void)
{
vec4 sum = texture2D(texUnit, varyingTexCoords.st) * kernel[0];
for (int i = 1; i < 25; i++) {
sum += texture2D(texUnit, varyingTexCoords.st - offsets[i]) * kernel[i];
sum += texture2D(texUnit, varyingTexCoords.st + offsets[i]) * kernel[i];
}
gl_FragColor = sum;
}