kwin/shaders/1.40/lanczos-fragment.glsl

20 lines
419 B
GLSL

#version 140
uniform sampler2D sampler;
uniform vec2 offsets[16];
uniform vec4 kernel[16];
in vec2 texcoord0;
out vec4 fragColor;
void main(void)
{
vec4 sum = texture(sampler, texcoord0.st) * kernel[0];
for (int i = 1; i < 16; i++) {
sum += texture(sampler, texcoord0.st - offsets[i]) * kernel[i];
sum += texture(sampler, texcoord0.st + offsets[i]) * kernel[i];
}
fragColor = sum;
}