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Dithering

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nefrace
2025-05-14 23:26:47 +03:00
parent e5cbc4ca5f
commit 120a70cf42
5 changed files with 36 additions and 14 deletions
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14
assets/shaders/postprocess.glsl
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@ -15,13 +15,25 @@ uniform vec4 colDiffuse;
out vec4 finalColor;
const int bayer16[16] = int[16](0, 8, 2, 10,
12, 4, 14, 6,
3, 11, 1, 9,
15, 7, 13, 5);
void main() {
vec4 texelColor = texture(texture0, fragTexCoord);
float grey = 0.21 * texelColor.r + 0.71 * texelColor.g + 0.07 * texelColor.b ;
int col = int(mod(gl_FragCoord.x, 4));
int row = int(mod(gl_FragCoord.y, 4));
float threshold = float(bayer16[col + 4 * row]) / 16.0 - 0.5;
grey = clamp(grey + threshold * 0.04 + 0.15 , 0.01, 0.99);
vec2 paluv = vec2(grey, 0.5);
vec4 paletteValue = texture(texture1, paluv);
finalColor.a = 1.0;
// finalColor.rgb = vec3(floor(grey * POSTERIZE) / POSTERIZE );
// finalColor.rgb = floor(texelColor.rgb * POSTERIZE) / POSTERIZE;
finalColor.rgb = paletteValue.rgb;