1 files changed, 40 insertions, 0 deletions
diff --git a/.config/hypr/shaders/10_grayscale.glsl b/.config/hypr/shaders/10_grayscale.glsl
new file mode 100755
index 0000000..f80900e
--- /dev/null
+++ b/.config/hypr/shaders/10_grayscale.glsl
@@ -0,0 +1,40 @@
+#version 300 es
+// Grayscale Shader for Hyprland - OPTIMIZED
+// Added: Optional gamma-correct conversion for accurate luminance
+
+precision highp float;
+
+in vec2 v_texcoord;
+uniform sampler2D tex;
+out vec4 fragColor;
+
+// Rec. 709 Luma coefficients (sRGB/HDTV standard)
+const vec3 LUMA_709 = vec3(0.2126, 0.7152, 0.0722);
+
+// Set to true for gamma-correct grayscale (more accurate but slightly slower)
+const bool GAMMA_CORRECT = false;
+
+// sRGB gamma functions
+float toLinear(float c) {
+    return c <= 0.04045 ? c / 12.92 : pow((c + 0.055) / 1.055, 2.4);
+}
+float toSRGB(float c) {
+    return c <= 0.0031308 ? c * 12.92 : 1.055 * pow(c, 1.0/2.4) - 0.055;
+}
+
+void main() {
+    vec4 pixColor = texture(tex, v_texcoord);
+    
+    float gray;
+    if (GAMMA_CORRECT) {
+        // Convert to linear space, compute luminance, convert back
+        vec3 linear = vec3(toLinear(pixColor.r), toLinear(pixColor.g), toLinear(pixColor.b));
+        float luminance = dot(linear, LUMA_709);
+        gray = toSRGB(luminance);
+    } else {
+        // Fast path: direct computation in gamma space
+        gray = dot(pixColor.rgb, LUMA_709);
+    }
+
+    fragColor = vec4(vec3(gray), pixColor.a);
+}