bsnes/shaders/MDAPT-Dedithering.shader/mdapt-pass3.fs

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// This is a port of the original CG shader to the quark format
// the original shader can be found here :
// https://github.com/libretro/common-shaders/tree/master/dithering/mdapt-4p
/*
Merge Dithering and Pseudo Transparency Shader v1.5 - Pass 3
by Sp00kyFox, 2013
Tags the rest of the detected pattern from pass 1.
*/
#version 150
uniform sampler2D source[];
uniform vec4 sourceSize[];
uniform vec4 targetSize;
in Vertex{
vec2 texCoord;
};
out vec4 fragColor;
float remapTo01(float v, float low, float high)
{
return clamp((v - low)/(high-low),0.0,1.0);
}
float remapFrom01(float v, float low, float high)
{
return round(mix(low, high, v));
}
void main(void) {
vec2 pos = texCoord*sourceSize[0].xy; // pos = pixel position
vec2 dir = sign(pos); // dir = pixel direction
vec2 g1 = dir*vec2(sourceSize[0].z,0.0);
vec2 g2 = dir*vec2(0.0,sourceSize[0].w);
/*
U2
UL U1 UR
L2 L1 xC R1 R2
DL D1 DR
D2
*/
vec4 xC = texture(source[0], texCoord).xyzw;
vec4 xL1 = texture(source[0], texCoord - g1).xyzw;
vec4 xL2 = texture(source[0], texCoord - 2*g1).xyzw;
vec4 xR1 = texture(source[0], texCoord + g1).xyzw;
vec4 xR2 = texture(source[0], texCoord + 2*g1).xyzw;
vec4 xU1 = texture(source[0], texCoord - g2).xyzw;
vec4 xU2 = texture(source[0], texCoord - 2*g2).xyzw;
vec4 xD1 = texture(source[0], texCoord + g2).xyzw;
vec4 xD2 = texture(source[0], texCoord + 2*g2).xyzw;
vec4 xUL = texture(source[0], texCoord - g1 - g2).xyzw;
vec4 xUR = texture(source[0], texCoord + g1 - g2).xyzw;
vec4 xDL = texture(source[0], texCoord - g1 + g2).xyzw;
vec4 xDR = texture(source[0], texCoord + g1 + g2).xyzw;
float C = remapFrom01(xC.w, 0, 15) - 2;
float L1 = remapFrom01(xL1.w, 0, 15) - 2;
float L2 = remapFrom01(xL2.w, 0, 15) - 2;
float R1 = remapFrom01(xR1.w, 0, 15) - 2;
float R2 = remapFrom01(xR2.w, 0, 15) - 2;
float U1 = remapFrom01(xU1.w, 0, 15) - 2;
float U2 = remapFrom01(xU2.w, 0, 15) - 2;
float D1 = remapFrom01(xD1.w, 0, 15) - 2;
float D2 = remapFrom01(xD2.w, 0, 15) - 2;
float UL = remapFrom01(xUL.w, 0, 15) - 2;
float UR = remapFrom01(xUR.w, 0, 15) - 2;
float DL = remapFrom01(xDL.w, 0, 15) - 2;
float DR = remapFrom01(xDR.w, 0, 15) - 2;
/*
tag values:
0 nothing
checkerboard pattern
9 DL
8 DR
7 UR
6 UL
5 full
horizontal two-line checkerboard
4 bottom line
3 upper line
vertical two-line checkerboard
2 left line
1 right line
one line dither
-1 horizontal
-2 vertical
*/
// checkerboard pattern
if(U1 == 5 || D1 == 5 || L1 == 5 || R1 == 5 || UL == 5 || UR == 5 || DR == 5 || DL == 5)
{
fragColor=vec4(xC.xyz, remapTo01(5+2, 0, 15));
return ;
}
if(U1 == 6 || L1 == 6 || UL == 6 || UR == 6 || DL == 6) // UL
{
fragColor=vec4(xC.xyz, remapTo01(6+2, 0, 15));
return ;
}
if(U1 == 7 || R1 == 7 || UL == 7 || UR == 7 || DR == 7) // UR
{
fragColor=vec4(xC.xyz, remapTo01(7+2, 0, 15));
return ;
}
if(D1 == 8 || R1 == 8 || UR == 8 || DR == 8 || DL == 8) // DR
{
fragColor=vec4(xC.xyz, remapTo01(8+2, 0, 15));
return ;
}
if(D1 == 9 || L1 == 9 || UL == 9 || DR == 9 || DL == 9) // DL
{
fragColor=vec4(xC.xyz, remapTo01(9+2, 0, 15));
return ;
}
// horizontal two-line checkerboard
if (L2 == 4 || L1 == 4 || R1 == 4 || R2 == 4 || DL == 4 || D1 == 4 || DR == 4)
{
fragColor=vec4(xC.xyz, remapTo01(4+2, 0, 15));
return ;
}
if (L2 == 3 || L1 == 3 || R1 == 3 || R2 == 3 || UL == 3 || U1 == 3 || UR == 3)
{
fragColor=vec4(xC.xyz, remapTo01(3+2, 0, 15));
return ;
}
// vertical two-line checkerboard
if (U2 == 2 || U1 == 2 || D1 == 2 || D2 == 2 || UL == 2 || L1 == 2 || DL == 2)
{
fragColor=vec4(xC.xyz, remapTo01(2+2, 0, 15));
return ;
}
if (U2 == 1 || U1 == 1 || D1 == 1 || D2 == 1 || UR == 1 || R1 == 1 || DR == 1)
{
fragColor=vec4(xC.xyz, remapTo01(1+2, 0, 15));
return ;
}
if(C > 0){
fragColor=xC;
return ;
}
// horizontal one line dither
if (L2 == -1 || L1 == -1 || R1 == -1 || R2 == -1)
{
fragColor=vec4(xC.xyz, remapTo01(-1+2, 0, 15));
return ;
}
// vertical one line dither
if (U2 == -2 || U1 == -2 || D1 == -2 || D2 == -2)
{
fragColor=vec4(xC.xyz, remapTo01(-2+2, 0, 15));
return;
}
fragColor=xC;
}