color changes

src/game/shaders/dither/frag.sc

@@ -86,12 +86,26 @@ float dither(float brightness, vec2 inputUv)
 
 vec4 rgbToCmyk(vec3 rgb)
 {
-	return vec4(1.0, 1.0, 1.0, 1.0);
+	float k = min(1.0 - rgb.r, min(1.0 - rgb.g, 1.0 - rgb.b));
+	vec3 cmy = vec3(0.0, 0.0, 0.0);
+	float invK = 1.0 - k;
+	if (invK != 0.0)
+	{
+		cmy.x = 1.0 - rgb.r - k;
+		cmy.y = 1.0 - rgb.g - k;
+		cmy.z = 1.0 - rgb.b - k;
+		cmy /= invK;
+	}
+	return saturate(vec4(cmy, k));
 }
 
 vec3 cmykToRgb(vec4 cmyk)
 {
-	return vec3(1.0, 1.0, 1.0);
+	float invK = 1.0 - cmyk.w;
+	float r = 1.0 - min(1.0, cmyk.x * invK + cmyk.w);
+	float g = 1.0 - min(1.0, cmyk.y * invK + cmyk.w);
+	float b = 1.0 - min(1.0, cmyk.z * invK + cmyk.w);
+	return saturate(vec3(r,g,b));
 }
 
 vec2 rotateUV(vec2 uv, vec2 angle)
@@ -117,17 +131,17 @@ void main()
 	float r = dither(texColor.r * brightness, v_uv0);
 	float g = dither(texColor.g * brightness, v_uv0);
 	float b = dither(texColor.b * brightness, v_uv0);
-	vec3 ditheredColor = vec3(r,g,b);
+	// vec3 ditheredColor = vec3(r,g,b);
 
 	vec4 cmyk = rgbToCmyk(texColor * brightness);
 	cmyk.x = dither(cmyk.x, rotateUV(v_uv0, float2(0.966, 0.259)));
     cmyk.y = dither(cmyk.y, rotateUV(v_uv0, float2(0.259, 0.966)));
     cmyk.z = dither(cmyk.z, rotateUV(v_uv0, float2(1.000, 0.000)));
     cmyk.w = dither(cmyk.w, rotateUV(v_uv0, float2(0.707, 0.707)));
-	// vec3 ditheredColor = cmykToRgb(cmyk);
+	vec3 ditheredColor = cmykToRgb(cmyk);
 	
 	// finalize
 	vec3 finalColor = mix(baseColor, ditheredColor, ditheredColor);
-	gl_FragColor = vec4(finalColor, 1.0);
-	// gl_FragColor = vec4(texColor * brightness, 1.0);
+	gl_FragColor = vec4(finalColor.rg, finalColor.b * 0.99, 1.0);
+	// gl_FragColor = vec4(ditheredColor, 1.0);
 }