First commit desu

shaders/glsl/mfx_huesaturation.fp

@@ -0,0 +1,90 @@
+vec3 rgb2hsv( vec3 c )
+{
+	vec4 K = vec4(0.0,-1.0/3.0,2.0/3.0,-1.0);
+	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 = 1.0e-10;
+	return vec3(abs(q.z+(q.w-q.y)/(6.0*d+e)),d/(q.x+e),q.x);
+}
+vec3 hsv2rgb( vec3 c )
+{
+	vec4 K = vec4(1.0,2.0/3.0,1.0/3.0,3.0);
+	vec3 p = abs(fract(c.xxx+K.xyz)*6.0-K.www);
+	return c.z*mix(K.xxx,clamp(p-K.xxx,0.0,1.0),c.y);
+}
+
+float hs_hue_overlap( float hue_p, float hue_s, float res )
+{
+	float v = hue_p+hue_s;
+	res += (hshue_a+v)/2.0;
+	return mod(res,1.0);
+}
+float hs_hue( float hue, float res )
+{
+	res += (hshue_a+hue)/2.0;
+	return mod(res,1.0);
+}
+float hs_sat( float sat, float res )
+{
+	float v = hssat_a+sat;
+	res *= v+1.0;
+	return clamp(res,0.0,1.0);
+}
+float hs_val( float val, float res )
+{
+	float v = (hsval_a+val)/2.0;
+	if ( v < 0.0 ) return res*(v+1.0);
+	return res+(v*(1.0-res));
+}
+void main()
+{
+	vec2 coord = TexCoord;
+	vec4 res = texture(InputTexture,coord);
+	vec3 hsv = rgb2hsv(res.rgb);
+	float ch = hsv.x*6.0;
+	int ph = 0, sh = 0;
+	float pv = 0.0, sv = 0.0;
+	bool usesh = false;
+	float hues[6] = {hshue_r,hshue_y,hshue_g,hshue_c,hshue_b,hshue_m};
+	float sats[6] = {hssat_r,hssat_y,hssat_g,hssat_c,hssat_b,hssat_m};
+	float vals[6] = {hsval_r,hsval_y,hsval_g,hsval_c,hsval_b,hsval_m};
+	float v;
+	for ( float h=0.0; h<7.0; h+=1.0 )
+	{
+		float ht = h+0.5;
+		if ( ch < ht+hsover )
+		{
+			ph = int(floor(h));
+			if ( (hsover > 0.0) && (ch > ht-hsover) )
+			{
+				usesh = true;
+				sh = ph+1;
+				sv = (ch-ht+hsover)/(2.0*hsover);
+				pv = 1.0-sv;
+			}
+			else usesh = false;
+			break;
+		}
+	}
+	if ( ph >= 6 )
+	{
+		ph = 0;
+		usesh = false;
+	}
+	if ( sh >= 6 ) sh = 0;
+	if ( usesh )
+	{
+		hsv.x = hs_hue_overlap(hues[ph]*pv,hues[sh]*sv,hsv.x);
+		hsv.y = hs_sat(sats[ph],hsv.y)*pv+hs_sat(sats[sh],hsv.y)*sv;
+		hsv.z = hs_val(vals[ph],hsv.z)*pv+hs_val(vals[sh],hsv.z)*sv;
+	}
+	else
+	{
+		hsv.x = hs_hue(hues[ph],hsv.x);
+		hsv.y = hs_sat(sats[ph],hsv.y);
+		hsv.z = hs_val(vals[ph],hsv.z);
+	}
+	res.rgb = hsv2rgb(hsv);
+	FragColor = res;
+}