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void rgb_to_hsv(vec4 rgb, out vec4 outcol)
{
float cmax, cmin, h, s, v, cdelta;
vec3 c;
cmax = max(rgb[0], max(rgb[1], rgb[2]));
cmin = min(rgb[0], min(rgb[1], rgb[2]));
cdelta = cmax - cmin;
v = cmax;
if (cmax != 0.0) {
s = cdelta / cmax;
}
else {
s = 0.0;
h = 0.0;
}
if (s == 0.0) {
h = 0.0;
}
else {
c = (vec3(cmax) - rgb.xyz) / cdelta;
if (rgb.x == cmax) {
h = c[2] - c[1];
}
else if (rgb.y == cmax) {
h = 2.0 + c[0] - c[2];
}
else {
h = 4.0 + c[1] - c[0];
}
h /= 6.0;
if (h < 0.0) {
h += 1.0;
}
}
outcol = vec4(h, s, v, rgb.w);
}
void hsv_to_rgb(vec4 hsv, out vec4 outcol)
{
float i, f, p, q, t, h, s, v;
vec3 rgb;
h = hsv[0];
s = hsv[1];
v = hsv[2];
if (s == 0.0) {
rgb = vec3(v, v, v);
}
else {
if (h == 1.0) {
h = 0.0;
}
h *= 6.0;
i = floor(h);
f = h - i;
rgb = vec3(f, f, f);
p = v * (1.0 - s);
q = v * (1.0 - (s * f));
t = v * (1.0 - (s * (1.0 - f)));
if (i == 0.0) {
rgb = vec3(v, t, p);
}
else if (i == 1.0) {
rgb = vec3(q, v, p);
}
else if (i == 2.0) {
rgb = vec3(p, v, t);
}
else if (i == 3.0) {
rgb = vec3(p, q, v);
}
else if (i == 4.0) {
rgb = vec3(t, p, v);
}
else {
rgb = vec3(v, p, q);
}
}
outcol = vec4(rgb, hsv.w);
}
void rgb_to_hsl(vec4 rgb, out vec4 outcol)
{
float cmax, cmin, h, s, l;
cmax = max(rgb[0], max(rgb[1], rgb[2]));
cmin = min(rgb[0], min(rgb[1], rgb[2]));
l = min(1.0, (cmax + cmin) / 2.0);
if (cmax == cmin) {
h = s = 0.0; /* achromatic */
}
else {
float cdelta = cmax - cmin;
s = l > 0.5 ? cdelta / (2.0 - cmax - cmin) : cdelta / (cmax + cmin);
if (cmax == rgb[0]) {
h = (rgb[1] - rgb[2]) / cdelta + (rgb[1] < rgb[2] ? 6.0 : 0.0);
}
else if (cmax == rgb[1]) {
h = (rgb[2] - rgb[0]) / cdelta + 2.0;
}
else {
h = (rgb[0] - rgb[1]) / cdelta + 4.0;
}
}
h /= 6.0;
outcol = vec4(h, s, l, rgb.w);
}
void hsl_to_rgb(vec4 hsl, out vec4 outcol)
{
float nr, ng, nb, chroma, h, s, l;
h = hsl[0];
s = hsl[1];
l = hsl[2];
nr = abs(h * 6.0 - 3.0) - 1.0;
ng = 2.0 - abs(h * 6.0 - 2.0);
nb = 2.0 - abs(h * 6.0 - 4.0);
nr = clamp(nr, 0.0, 1.0);
nb = clamp(nb, 0.0, 1.0);
ng = clamp(ng, 0.0, 1.0);
chroma = (1.0 - abs(2.0 * l - 1.0)) * s;
outcol = vec4((nr - 0.5) * chroma + l, (ng - 0.5) * chroma + l, (nb - 0.5) * chroma + l, hsl.w);
}
void color_alpha_clear(vec4 color, out vec4 result)
{
result = vec4(color.rgb, 1.0);
}
void color_alpha_premultiply(vec4 color, out vec4 result)
{
result = vec4(color.rgb * color.a, 1.0);
}
void color_alpha_unpremultiply(vec4 color, out vec4 result)
{
if (color.a == 0.0 || color.a == 1.0) {
result = vec4(color.rgb, 1.0);
}
else {
result = vec4(color.rgb / color.a, 1.0);
}
}
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