43 lines
1.2 KiB
GLSL
43 lines
1.2 KiB
GLSL
#version 330
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// Input vertex attributes (from vertex shader)
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in vec3 fragPosition;
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in vec2 fragTexCoord;
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in vec4 fragColor;
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in vec3 fragNormal;
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// Input uniform values
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uniform sampler2D texture0;
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uniform sampler2D texture1;
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uniform vec4 colDiffuse;
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#define POSTERIZE 5.0
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out vec4 finalColor;
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const int bayer16[16] = int[16](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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void main() {
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vec4 texelColor = texture(texture0, fragTexCoord);
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float grey = 0.21 * texelColor.r + 0.71 * texelColor.g + 0.07 * texelColor.b ;
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int col = int(mod(gl_FragCoord.x, 4));
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int row = int(mod(gl_FragCoord.y, 4));
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float threshold = float(bayer16[col + 4 * row]) / 16.0 - 0.5;
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grey = clamp(grey + threshold * 0.04 + 0.15 , 0.01, 0.99);
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vec2 paluv = vec2(grey, 0.5);
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vec4 paletteValue = texture(texture1, paluv);
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finalColor.a = 1.0;
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// finalColor.rgb = vec3(floor(grey * POSTERIZE) / POSTERIZE );
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// finalColor.rgb = floor(texelColor.rgb * POSTERIZE) / POSTERIZE;
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finalColor.rgb = paletteValue.rgb;
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//
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// finalColor.rgb = vec3(mean) + paletteValue.rgb;
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}
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