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#version 330 core
const float pR = 0.299;
const float pG = 0.587;
const float pB = 0.114;
const vec3 p = vec3(pR, pG, pB);
float dithering_matrix[64];
in vec2 UV;
in vec4 gl_FragCoord;
//in vec2 gl_fragCoord;
out vec4 color;
uniform sampler2D textureSampler;
void main() {
// Normalized pixel coordinates (from 0 to 1)
vec2 uv = UV; //iTime + (fragCoord.xy / iResolution.xy);
vec2 fragPos = gl_FragCoord.xy;
vec3 col = texture(textureSampler, UV).rgb;
vec3 colsqrt = col * col;
float luminance = sqrt(dot(p, colsqrt));
dithering_matrix = float[](
0.0, 48.0, 12.0, 60.0, 3.0, 51.0, 15.0, 61.0,
32.0, 16.0, 44.0, 28.0, 35.0, 19.0, 47.0, 31.0,
8.0, 56.0, 4.0, 52.0, 11.0, 59.0, 7.0, 55.0,
40.0, 24.0, 36.0, 20.0, 43.0, 27.0, 39.0, 23.0,
2.0, 50.0, 14.0, 62.0, 1.0, 49.0, 13.0, 61.0,
34.0, 18.0, 46.0, 30.0, 33.0, 17.0, 45.0, 29.0,
10.0, 58.0, 6.0, 54.0, 9.0, 57.0, 5.0, 53.0,
42.0, 26.0, 38.0, 22.0, 41.0, 25.0, 37.0, 21.0
);
/* BEGIN PASTE */
int x = int(mod(fragPos.x, 8.0));
int y = int(mod(fragPos.y, 8.0));
// index of flat matrix
int idx = (x * 8) + y;
float dither = dithering_matrix[idx];
// normalize the value
dither *= (1.0 / 64.0);
/* END PASTE */
// Output to screen
if (luminance > dither) {
color = vec4(col, 1.0);
} else {
color = vec4(
float(0x10) / 255.f, float(0x0a) / 255.f, float(0x33) / 255.f, 1.f
);
//color = vec4(0.0);
}
}
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