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#version 330
uniform sampler2D texture0;
in vec2 fragTexCoord;
out vec4 finalColor;
const float neareight = 255.0;
vec3 dither(vec3 col, uvec2 fc)
{
const int mat[16] = int[16] (
-4, 0, -3, 1,
2, -2, 3, -1,
-3, 1, -4, 0,
3, -1, 2, -2
);
ivec3 uncol = ivec3(col * neareight) + mat[(fc.y & uint(3)) * uint(4) + (fc.x & uint(3))];
return vec3(uncol) / neareight;
}
vec3 band_color(vec3 lol)
{
ivec3 res = ivec3(clamp(lol, 0.0, 1.0) * neareight) & ivec3(0xFF);
ivec3 ires = res >> 3;
ivec3 dres = (ires >> 2) & ivec3(7);
res = (ires << 3) | dres;
return vec3(res) / neareight;
}
void main()
{
vec4 texelColor = texture(texture0, fragTexCoord);
texelColor.rgb = band_color(dither(texelColor.rgb, uvec2(gl_FragCoord.xy)));
finalColor = texelColor;
}
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