80 lines
3.1 KiB
GLSL
80 lines
3.1 KiB
GLSL
#version 120
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#define goalHue 40.0 // the desired hue to display [0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 190 200 220 230 240 250 260 270 280 290 300 310 320 330 340 350]
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#define wiggle 20 // wiggle room [0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 190 200 220 230 240 250 260 270 280 290 300 310 320 330 340 350]
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//#define BLACKEN // Whether or not to blackent the background
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uniform sampler2D gcolor;
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varying vec2 texcoord;
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// All components are in the range [0…1], including hue.
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vec3 rgb2hsv(vec3 c)
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{
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vec4 K = vec4(0.0, -1.0 / 3.0, 2.0 / 3.0, -1.0);
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vec4 p = mix(vec4(c.bg, K.wz), vec4(c.gb, K.xy), step(c.b, c.g));
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vec4 q = mix(vec4(p.xyw, c.r), vec4(c.r, p.yzx), step(p.x, c.r));
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float d = q.x - min(q.w, q.y);
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float e = 1.0e-10;
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return vec3(abs(q.z + (q.w - q.y) / (6.0 * d + e)), d / (q.x + e), q.x);
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}
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// All components are in the range [0…1], including hue.
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vec3 hsv2rgb(vec3 c)
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{
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vec4 K = vec4(1.0, 2.0 / 3.0, 1.0 / 3.0, 3.0);
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vec3 p = abs(fract(c.xxx + K.xyz) * 6.0 - K.www);
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return c.z * mix(K.xxx, clamp(p - K.xxx, 0.0, 1.0), c.y);
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}
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const float steps = 4.0;
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const int indexMatrix4x4[16] = int[](0, 8, 2, 10,
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12, 4, 14, 6,
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3, 11, 1, 9,
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15, 7, 13, 5);
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const int indexMatrix2x2[4] = int[](0, 2,
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3, 1);
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const int indexMatrix8x8[64] = int[](0, 32, 8, 40, 2, 34, 10, 42,
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48, 16, 56, 24, 50, 18, 58, 26,
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12, 44, 4, 36, 14, 46, 6, 38,
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60, 28, 52, 20, 62, 30, 54, 22,
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3, 35, 11, 43, 1, 33, 9, 41,
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51, 19, 59, 27, 49, 17, 57, 25,
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15, 47, 7, 39, 13, 45, 5, 37,
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63, 31, 55, 23, 61, 29, 53, 21);
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float indexValue() {
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int x = int(mod(gl_FragCoord.x, 4));
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int y = int(mod(gl_FragCoord.y, 4));
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return indexMatrix4x4[(x + y * 4)] / 16.0;
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}
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float dither(float color) {
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float closestColor = (color <= 0.5) ? 0 : 1;
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float secondClosestColor = 1 - closestColor;
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float d = indexValue();
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float distance = abs(closestColor - color);
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return (distance <= d) ? closestColor : secondClosestColor;
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}
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void main() {
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float mask;
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vec3 ogRGB = texture2D(gcolor, texcoord).rgb;
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vec3 ogHSV = rgb2hsv(ogRGB).xyz;
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float val = ogHSV.z;
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float val4 = floor(val * 4.0) / 4.0;
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vec3 valtest = hsv2rgb(vec3(0, 0, val4)).rgb;
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vec3 test64 = vec3((floor(ogRGB.r * 4.0) / 4.0), (floor(ogRGB.g * 4.0) / 4.0), (floor(ogRGB.b * 4.0) / 4.0)).rgb;
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vec3 test64hsv = hsv2rgb(vec3((floor(ogHSV.x * 4.0) / 4.0), (floor(ogHSV.y * 4.0) /4.0), (floor(ogHSV.z * 8.0) /8.0))).rgb;
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vec3 otherdithertest = hsv2rgb(vec3(0, 0, dither(float(val * 1.0)))).rgb;
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vec3 otherdithertest2 = hsv2rgb(vec3((floor(ogHSV.x * 8.0) / 8.0), (floor(ogHSV.y * 8.0) /8.0), dither(float(val * 2.0)))).rgb;
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/* DRAWBUFFERS:0 */
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gl_FragData[0] = vec4(vec3(otherdithertest), 1.0); //gcolor
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}
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