36 lines
1 KiB
GLSL
36 lines
1 KiB
GLSL
/*
|
|
RetroFX palette reduction from MariENB
|
|
(C)2012-2022 Marisa Kirisame
|
|
*/
|
|
vec3 rgb2hsv( vec3 c )
|
|
{
|
|
vec4 K = vec4(0.,-1./3.,2./3.,-1.);
|
|
vec4 p = (c.g<c.b)?vec4(c.bg,K.wz):vec4(c.gb,K.xy);
|
|
vec4 q = (c.r<p.x)?vec4(p.xyw,c.r):vec4(c.r,p.yzx);
|
|
float d = q.x-min(q.w,q.y);
|
|
float e = 1.e-10;
|
|
return vec3(abs(q.z+(q.w-q.y)/(6.*d+e)),d/(q.x+e),q.x);
|
|
}
|
|
vec3 hsv2rgb( vec3 c )
|
|
{
|
|
vec4 K = vec4(1.,2./3.,1./3.,3.);
|
|
vec3 p = abs(fract(c.xxx+K.xyz)*6.-K.www);
|
|
return c.z*mix(K.xxx,clamp(p-K.xxx,0.,1.),c.y);
|
|
}
|
|
|
|
void main()
|
|
{
|
|
vec2 coord = TexCoord;
|
|
vec4 res = texture(InputTexture,coord);
|
|
vec3 hsv = rgb2hsv(res.rgb);
|
|
hsv.y = clamp(hsv.y*palsat,0.,1.);
|
|
hsv.z = pow(max(hsv.z,0.),palpow);
|
|
res.rgb = hsv2rgb(hsv);
|
|
ivec2 dcoord = ivec2(int(coord.x*sfact.x)%8,int(coord.y*sfact.y)%8);
|
|
res.rgb += paldither*texelFetch(DitherTexture,dcoord,0).x-.5*paldither;
|
|
vec3 lc = clamp(floor(res.rgb*64),0,63);
|
|
ivec2 lcoord = ivec2(lc.r,lc.g+lc.b*64);
|
|
lcoord.x += 64*palnum;
|
|
res.rgb = texelFetch(PalLUTTexture,lcoord,0).rgb;
|
|
FragColor = res;
|
|
}
|