104 lines
2.9 KiB
GLSL
104 lines
2.9 KiB
GLSL
// Visualizes the out of gamut colors using false color.
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//!HOOK OUTPUT
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//!BIND HOOKED
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//!DESC gamut mapping (false color)
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float cbrt(float x) {
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return sign(x) * pow(abs(x), 1.0 / 3.0);
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}
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vec3 cbrt(vec3 color) {
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return vec3(
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cbrt(color.x),
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cbrt(color.y),
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cbrt(color.z)
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);
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}
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vec3 RGB_to_XYZ(vec3 RGB) {
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return RGB * mat3(
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0.6369580483012914, 0.14461690358620832, 0.1688809751641721,
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0.2627002120112671, 0.6779980715188708, 0.05930171646986196,
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0.000000000000000, 0.028072693049087428, 1.060985057710791
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);
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}
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vec3 XYZ_to_RGB(vec3 XYZ) {
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return XYZ * mat3(
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1.716651187971268, -0.355670783776392, -0.253366281373660,
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-0.666684351832489, 1.616481236634939, 0.0157685458139111,
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0.017639857445311, -0.042770613257809, 0.942103121235474
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);
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}
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vec3 XYZ_to_LMS(vec3 XYZ) {
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return XYZ * mat3(
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0.8190224379967030, 0.3619062600528904, -0.1288737815209879,
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0.0329836539323885, 0.9292868615863434, 0.0361446663506424,
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0.0481771893596242, 0.2642395317527308, 0.6335478284694309
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);
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}
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vec3 LMS_to_XYZ(vec3 LMS) {
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return LMS * mat3(
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1.2268798758459243, -0.5578149944602171, 0.2813910456659647,
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-0.0405757452148008, 1.1122868032803170, -0.0717110580655164,
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-0.0763729366746601, -0.4214933324022432, 1.5869240198367816
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);
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}
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vec3 LMS_to_Lab(vec3 LMS) {
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return LMS * mat3(
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0.2104542683093140, 0.7936177747023054, -0.0040720430116193,
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1.9779985324311684, -2.4285922420485799, 0.4505937096174110,
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0.0259040424655478, 0.7827717124575296, -0.8086757549230774
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);
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}
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vec3 Lab_to_LMS(vec3 Lab) {
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return Lab * mat3(
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1.0000000000000000, 0.3963377773761749, 0.2158037573099136,
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1.0000000000000000, -0.1055613458156586, -0.0638541728258133,
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1.0000000000000000, -0.0894841775298119, -1.2914855480194092
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);
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}
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vec3 RGB_to_Lab(vec3 color) {
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color = RGB_to_XYZ(color);
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color = XYZ_to_LMS(color);
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color = cbrt(color);
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color = LMS_to_Lab(color);
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return color;
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}
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vec3 Lab_to_RGB(vec3 color) {
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color = Lab_to_LMS(color);
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color = pow(color, vec3(3.0));
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color = LMS_to_XYZ(color);
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color = XYZ_to_RGB(color);
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return color;
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}
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vec3 BT2020_to_BT709(vec3 color) {
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return color * mat3(
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1.66049100210843540, -0.58764113878854950, -0.072849863319884740,
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-0.12455047452159074, 1.13289989712595960, -0.008349422604369515,
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-0.01815076335490526, -0.10057889800800737, 1.118729661362913000
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);
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}
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vec4 hook() {
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vec4 color = HOOKED_tex(HOOKED_pos);
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vec3 color_dst = BT2020_to_BT709(color.rgb);
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vec3 color_dst_cliped = clamp(color_dst, 0.0, 1.0);
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bool is_in_gamut = color_dst == color_dst_cliped;
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color.rgb = RGB_to_Lab(color.rgb);
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color.rgb = is_in_gamut ? vec3(color.x, vec2(0.0)) : vec3(0.5, color.yz);
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color.rgb = Lab_to_RGB(color.rgb);
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color.rgb = BT2020_to_BT709(color.rgb);
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return color;
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}
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