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more 'correct' dithering shader code

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minjaesong
2023-09-15 15:51:37 +09:00
parent cacef34473
commit 61f0528205
2 changed files with 11 additions and 3 deletions
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7
src/shaders/postproc_dither.frag
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@@ -37,7 +37,8 @@ vec4 invQuant = vec4(1.0 / quant);
out vec4 fragColor;
const vec2 boolean = vec2(0.0, 1.0);
const vec4 halfPulldown = vec4(0.5 / 255.0); // 255.0 comes from the dithering pattern, not the quantiser
const vec4 halfPullUp = vec4(255.0 / 254.5); // 255.0 comes from the dithering pattern, not the quantiser
const vec2 patternsize = vec2(1.0/512.0, 1.0/512.0);
@@ -46,8 +47,8 @@ vec4 nearestColour(vec4 inColor) {
}
vec4 getDitherredDot(vec4 inColor) {
vec4 bayerThreshold = swizzler * vec4(texture(u_pattern, (gl_FragCoord.xy + rnd) * patternsize));
return nearestColour(fma(bayerThreshold, invQuant, inColor));
vec4 bayerThreshold = swizzler * vec4(texture(u_pattern, (gl_FragCoord.xy + rnd) * patternsize) - halfPulldown);
return nearestColour(fma(bayerThreshold, invQuant, inColor * halfPullUp));
}
void main(void) {