mirror of https://github.com/bsnes-emu/bsnes.git
162 lines
7.1 KiB
Forth
162 lines
7.1 KiB
Forth
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// This is a port of the original CG shader to the quark format
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// the original shader can be found here :
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// https://github.com/libretro/common-shaders/tree/master/dithering/mdapt-4p
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/*
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Merge Dithering and Pseudo Transparency Shader v1.5 - Pass 1
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by Sp00kyFox, 2013
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Finds specific patterns and tags their central pixel.
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*/
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#version 150
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// Radius of the area where the algorithm looks for other detected pixels.
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#define rad 2
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// Minimal count of detection pixels in search area to be rated as valid.
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#define minimum 3
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uniform sampler2D source[];
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uniform vec4 sourceSize[];
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uniform vec4 targetSize;
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in Vertex{
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vec2 texCoord;
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};
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out vec4 fragColor;
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float remapTo01(float v, float low, float high)
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{
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return clamp((v - low)/(high-low),0.0,1.0);
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}
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float remapFrom01(float v, float low, float high)
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{
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return round(mix(low, high, v));
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}
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void main(void) {
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vec2 pos = texCoord*sourceSize[0].xy; // pos = pixel position
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vec2 dir = sign(pos); // dir = pixel direction
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vec2 g1 = dir*vec2(sourceSize[0].z,0.0);
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vec2 g2 = dir*vec2(0.0,sourceSize[0].w);
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vec4 CC = texture(source[0], texCoord).xyzw;
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float C = remapFrom01(CC.w, 0, 15) - 2;
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if(C == 0){
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fragColor=CC;
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return;
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}
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/*
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tag values:
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0 nothing
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checkerboard pattern
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9 DL
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8 DR
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7 UR
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6 UL
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5 full
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horizontal two-line checkerboard
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4 bottom line
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3 upper line
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vertical two-line checkerboard
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2 left line
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1 right line
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one line dither
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-1 horizontal
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-2 vertical
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*/
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int hits = 0;
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if(C > 0)
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{
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// for(int x=-rad; x<=rad; x++)
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// {
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// for(int y=-rad; y<=rad; y++)
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// {
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// hits += ((remapFrom01(texture(source[0], texCoord + (x*g1) + (y*g2)).x, 0, 15) - 2) > 0) ? 1 : 0;
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// }
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// }
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hits += ((remapFrom01(texture(source[0], texCoord + (-2*g1) + (-2*g2)).w, 0, 15) - 2) > 0) ? 1 : 0;
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hits += ((remapFrom01(texture(source[0], texCoord + (-2*g1) + (-1*g2)).w, 0, 15) - 2) > 0) ? 1 : 0;
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hits += ((remapFrom01(texture(source[0], texCoord + (-2*g1) + ( 0*g2)).w, 0, 15) - 2) > 0) ? 1 : 0;
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hits += ((remapFrom01(texture(source[0], texCoord + (-2*g1) + ( 1*g2)).w, 0, 15) - 2) > 0) ? 1 : 0;
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hits += ((remapFrom01(texture(source[0], texCoord + (-2*g1) + ( 2*g2)).w, 0, 15) - 2) > 0) ? 1 : 0;
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hits += ((remapFrom01(texture(source[0], texCoord + (-1*g1) + (-2*g2)).w, 0, 15) - 2) > 0) ? 1 : 0;
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hits += ((remapFrom01(texture(source[0], texCoord + (-1*g1) + (-1*g2)).w, 0, 15) - 2) > 0) ? 1 : 0;
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hits += ((remapFrom01(texture(source[0], texCoord + (-1*g1) + ( 0*g2)).w, 0, 15) - 2) > 0) ? 1 : 0;
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hits += ((remapFrom01(texture(source[0], texCoord + (-1*g1) + ( 1*g2)).w, 0, 15) - 2) > 0) ? 1 : 0;
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hits += ((remapFrom01(texture(source[0], texCoord + (-1*g1) + ( 2*g2)).w, 0, 15) - 2) > 0) ? 1 : 0;
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hits += ((remapFrom01(texture(source[0], texCoord + ( 0*g1) + (-2*g2)).w, 0, 15) - 2) > 0) ? 1 : 0;
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hits += ((remapFrom01(texture(source[0], texCoord + ( 0*g1) + (-1*g2)).w, 0, 15) - 2) > 0) ? 1 : 0;
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hits += ((remapFrom01(texture(source[0], texCoord + ( 0*g1) + ( 0*g2)).w, 0, 15) - 2) > 0) ? 1 : 0;
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hits += ((remapFrom01(texture(source[0], texCoord + ( 0*g1) + ( 1*g2)).w, 0, 15) - 2) > 0) ? 1 : 0;
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hits += ((remapFrom01(texture(source[0], texCoord + ( 0*g1) + ( 2*g2)).w, 0, 15) - 2) > 0) ? 1 : 0;
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hits += ((remapFrom01(texture(source[0], texCoord + ( 1*g1) + (-2*g2)).w, 0, 15) - 2) > 0) ? 1 : 0;
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hits += ((remapFrom01(texture(source[0], texCoord + ( 1*g1) + (-1*g2)).w, 0, 15) - 2) > 0) ? 1 : 0;
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hits += ((remapFrom01(texture(source[0], texCoord + ( 1*g1) + ( 0*g2)).w, 0, 15) - 2) > 0) ? 1 : 0;
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hits += ((remapFrom01(texture(source[0], texCoord + ( 1*g1) + ( 1*g2)).w, 0, 15) - 2) > 0) ? 1 : 0;
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hits += ((remapFrom01(texture(source[0], texCoord + ( 1*g1) + ( 2*g2)).w, 0, 15) - 2) > 0) ? 1 : 0;
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hits += ((remapFrom01(texture(source[0], texCoord + ( 2*g1) + (-2*g2)).w, 0, 15) - 2) > 0) ? 1 : 0;
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hits += ((remapFrom01(texture(source[0], texCoord + ( 2*g1) + (-1*g2)).w, 0, 15) - 2) > 0) ? 1 : 0;
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hits += ((remapFrom01(texture(source[0], texCoord + ( 2*g1) + ( 0*g2)).w, 0, 15) - 2) > 0) ? 1 : 0;
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hits += ((remapFrom01(texture(source[0], texCoord + ( 2*g1) + ( 1*g2)).w, 0, 15) - 2) > 0) ? 1 : 0;
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hits += ((remapFrom01(texture(source[0], texCoord + ( 2*g1) + ( 2*g2)).w, 0, 15) - 2) > 0) ? 1 : 0;
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}
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else
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{
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// for(int x=-rad; x<=rad; x++)
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// {
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// for(int y=-rad; y<=rad; y++)
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// {
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// hits += ((remapFrom01(texture(source[0], texCoord + (x*g1) + (y*g2)).x, 0, 15) - 2) == C) ? 1 : 0;
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// }
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// }
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hits += ((remapFrom01(texture(source[0], texCoord + (-2*g1) + (-2*g2)).w, 0, 15) - 2) == C) ? 1 : 0;
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hits += ((remapFrom01(texture(source[0], texCoord + (-2*g1) + (-1*g2)).w, 0, 15) - 2) == C) ? 1 : 0;
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hits += ((remapFrom01(texture(source[0], texCoord + (-2*g1) + ( 0*g2)).w, 0, 15) - 2) == C) ? 1 : 0;
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hits += ((remapFrom01(texture(source[0], texCoord + (-2*g1) + ( 1*g2)).w, 0, 15) - 2) == C) ? 1 : 0;
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hits += ((remapFrom01(texture(source[0], texCoord + (-2*g1) + ( 2*g2)).w, 0, 15) - 2) == C) ? 1 : 0;
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hits += ((remapFrom01(texture(source[0], texCoord + (-1*g1) + (-2*g2)).w, 0, 15) - 2) == C) ? 1 : 0;
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hits += ((remapFrom01(texture(source[0], texCoord + (-1*g1) + (-1*g2)).w, 0, 15) - 2) == C) ? 1 : 0;
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hits += ((remapFrom01(texture(source[0], texCoord + (-1*g1) + ( 0*g2)).w, 0, 15) - 2) == C) ? 1 : 0;
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hits += ((remapFrom01(texture(source[0], texCoord + (-1*g1) + ( 1*g2)).w, 0, 15) - 2) == C) ? 1 : 0;
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hits += ((remapFrom01(texture(source[0], texCoord + (-1*g1) + ( 2*g2)).w, 0, 15) - 2) == C) ? 1 : 0;
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hits += ((remapFrom01(texture(source[0], texCoord + ( 0*g1) + (-2*g2)).w, 0, 15) - 2) == C) ? 1 : 0;
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hits += ((remapFrom01(texture(source[0], texCoord + ( 0*g1) + (-1*g2)).w, 0, 15) - 2) == C) ? 1 : 0;
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hits += ((remapFrom01(texture(source[0], texCoord + ( 0*g1) + ( 0*g2)).w, 0, 15) - 2) == C) ? 1 : 0;
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hits += ((remapFrom01(texture(source[0], texCoord + ( 0*g1) + ( 1*g2)).w, 0, 15) - 2) == C) ? 1 : 0;
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hits += ((remapFrom01(texture(source[0], texCoord + ( 0*g1) + ( 2*g2)).w, 0, 15) - 2) == C) ? 1 : 0;
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hits += ((remapFrom01(texture(source[0], texCoord + ( 1*g1) + (-2*g2)).w, 0, 15) - 2) == C) ? 1 : 0;
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hits += ((remapFrom01(texture(source[0], texCoord + ( 1*g1) + (-1*g2)).w, 0, 15) - 2) == C) ? 1 : 0;
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hits += ((remapFrom01(texture(source[0], texCoord + ( 1*g1) + ( 0*g2)).w, 0, 15) - 2) == C) ? 1 : 0;
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hits += ((remapFrom01(texture(source[0], texCoord + ( 1*g1) + ( 1*g2)).w, 0, 15) - 2) == C) ? 1 : 0;
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hits += ((remapFrom01(texture(source[0], texCoord + ( 1*g1) + ( 2*g2)).w, 0, 15) - 2) == C) ? 1 : 0;
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hits += ((remapFrom01(texture(source[0], texCoord + ( 2*g1) + (-2*g2)).w, 0, 15) - 2) == C) ? 1 : 0;
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hits += ((remapFrom01(texture(source[0], texCoord + ( 2*g1) + (-1*g2)).w, 0, 15) - 2) == C) ? 1 : 0;
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hits += ((remapFrom01(texture(source[0], texCoord + ( 2*g1) + ( 0*g2)).w, 0, 15) - 2) == C) ? 1 : 0;
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hits += ((remapFrom01(texture(source[0], texCoord + ( 2*g1) + ( 1*g2)).w, 0, 15) - 2) == C) ? 1 : 0;
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hits += ((remapFrom01(texture(source[0], texCoord + ( 2*g1) + ( 2*g2)).w, 0, 15) - 2) == C) ? 1 : 0;
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fragColor=CC;
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return;
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}
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if(hits < minimum)
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fragColor=vec4(CC.xyz, remapTo01(2, 0, 15));
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else
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fragColor=CC;
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}
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