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halved the number of dither pattern textures and added even more variations using the swizzling

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minjaesong
2022-08-30 01:53:16 +09:00
parent bf962376d4
commit 2e0f55567f
14 changed files with 62 additions and 25 deletions
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16
src/shaders/postproc_dither.frag
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@@ -22,7 +22,12 @@ varying vec2 v_texCoords;
uniform sampler2D u_texture;
uniform sampler2D u_pattern;
uniform ivec2 rnd = ivec2(0,0);
uniform mat4 swizzler = mat4(
1.0,0.0,0.0,0.0,
0.0,1.0,0.0,0.0,
0.0,0.0,1.0,0.0,
0.0,0.0,0.0,1.0
);
uniform float quant = 255.0; // 64 steps -> 63.0; 256 steps -> 255.0
vec2 boolean = vec2(0.0, 1.0);
@@ -50,7 +55,7 @@ vec4 nearestColour(vec4 inColor) {
}
vec4 getDitherredDot(vec4 inColor) {
vec4 bayerThreshold = vec4(matrixNormaliser + texture2D(u_pattern, (gl_FragCoord.xy + rnd) * patternsize));
vec4 bayerThreshold = swizzler * vec4(matrixNormaliser + texture2D(u_pattern, (gl_FragCoord.xy + rnd) * patternsize));
return nearestColour(bayerThreshold * vec4(1.0 / quant) + inColor);
}
@@ -71,5 +76,10 @@ void main(void) {
// Dither the output
vec4 graded = ycocg_to_rgb * newColour;
vec4 selvec = getDitherredDot(graded);
gl_FragColor = selvec * boolean.yyyx + boolean.xxxy; // use quantised RGB but not the A
vec4 outcol = selvec * boolean.yyyx + boolean.xxxy; // use quantised RGB but not the A
gl_FragColor = outcol;
// ivec4 bytes = ivec4(255.0 * outcol);
// ivec4 mask = ivec4(0x55);
// gl_FragColor = (bytes ^ mask) / 255.0;
}