core: move colorspace handling to oklab (#8635)

* Meson: add hyprgraphics

* Nix: add hyprgraphics

* CI/setup_base: get hyprgraphics-git

---------

Co-authored-by: Mihai Fufezan <mihai@fufexan.net>

1 files changed, 61 insertions, 1 deletions

diff --git a/src/render/shaders/Border.hpp b/src/render/shaders/Border.hpp
index 1f4a1d97..acd3f3ff 100644
--- a/src/render/shaders/Border.hpp
+++ b/src/render/shaders/Border.hpp
@@ -17,12 +17,32 @@ uniform float radius;
 uniform float radiusOuter;
 uniform float thick;
 
+// Gradients are in OkLabA!!!! {l, a, b, alpha}
 uniform vec4 gradient[10];
+uniform vec4 gradient2[10];
 uniform int gradientLength;
+uniform int gradient2Length;
 uniform float angle;
+uniform float angle2;
+uniform float gradientLerp;
 uniform float alpha;
 
-vec4 getColorForCoord(vec2 normalizedCoord) {
+float linearToGamma(float x) {
+    return x >= 0.0031308 ? 1.055 * pow(x, 0.416666666) - 0.055 : 12.92 * x;
+}
+
+vec4 okLabAToSrgb(vec4 lab) {
+    float l = pow(lab[0] + lab[1] * 0.3963377774 + lab[2] * 0.2158037573, 3.0);
+    float m = pow(lab[0] + lab[1] * (-0.1055613458) + lab[2] * (-0.0638541728), 3.0);
+    float s = pow(lab[0] + lab[1] * (-0.0894841775) + lab[2] * (-1.2914855480), 3.0);
+
+    return vec4(linearToGamma(l * 4.0767416621 + m * -3.3077115913 + s * 0.2309699292), 
+                linearToGamma(l * (-1.2684380046) + m * 2.6097574011 + s * (-0.3413193965)),
+                linearToGamma(l * (-0.0041960863) + m * (-0.7034186147) + s * 1.7076147010),
+                lab[3]);
+}
+
+vec4 getOkColorForCoordArray1(vec2 normalizedCoord) {
     if (gradientLength < 2)
         return gradient[0];
 
@@ -51,6 +71,46 @@ vec4 getColorForCoord(vec2 normalizedCoord) {
     return gradient[top] * (progress - float(bottom)) + gradient[bottom] * (float(top) - progress);
 }
 
+vec4 getOkColorForCoordArray2(vec2 normalizedCoord) {
+    if (gradient2Length < 2)
+        return gradient2[0];
+
+    float finalAng = 0.0;
+
+    if (angle2 > 4.71 /* 270 deg */) {
+        normalizedCoord[1] = 1.0 - normalizedCoord[1];
+        finalAng = 6.28 - angle;
+    } else if (angle2 > 3.14 /* 180 deg */) {
+        normalizedCoord[0] = 1.0 - normalizedCoord[0];
+        normalizedCoord[1] = 1.0 - normalizedCoord[1];
+        finalAng = angle - 3.14;
+    } else if (angle2 > 1.57 /* 90 deg */) {
+        normalizedCoord[0] = 1.0 - normalizedCoord[0];
+        finalAng = 3.14 - angle2;
+    } else {
+        finalAng = angle2;
+    }
+
+    float sine = sin(finalAng);
+
+    float progress = (normalizedCoord[1] * sine + normalizedCoord[0] * (1.0 - sine)) * float(gradient2Length - 1);
+    int bottom = int(floor(progress));
+    int top = bottom + 1;
+
+    return gradient2[top] * (progress - float(bottom)) + gradient2[bottom] * (float(top) - progress);
+}
+
+vec4 getColorForCoord(vec2 normalizedCoord) {
+    vec4 result1 = getOkColorForCoordArray1(normalizedCoord);
+
+    if (gradient2Length <= 0)
+        return okLabAToSrgb(result1);
+
+    vec4 result2 = getOkColorForCoordArray2(normalizedCoord);
+
+    return okLabAToSrgb(mix(result1, result2, gradientLerp));
+}
+
 void main() {
 
     highp vec2 pixCoord = vec2(gl_FragCoord);