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#version 300 es
// Chromatic Aberration Shader for Hyprland - OPTIMIZED
// Fixes: Edge clamping, aspect ratio correction, quadratic falloff
precision highp float;
in vec2 v_texcoord;
uniform sampler2D tex;
out vec4 fragColor;
// --- CONFIGURATION ---
const float STRENGTH = 0.010;
// Set to your monitor's aspect ratio (16/9, 21/9, etc.) or use 1.0 for uncorrected
const float ASPECT_RATIO = 16.0 / 9.0;
// Use quadratic falloff for more realistic lens distortion
const bool QUADRATIC_FALLOFF = true;
void main() {
// Aspect-corrected center distance
vec2 distFromCenter = v_texcoord - 0.5;
distFromCenter.x *= ASPECT_RATIO;
// Calculate offset magnitude
float dist = length(distFromCenter);
float falloff = QUADRATIC_FALLOFF ? dist * dist : dist;
// Normalize direction and apply strength
vec2 dir = normalize(distFromCenter + 0.0001); // Prevent div by zero
vec2 offset = dir * falloff * STRENGTH;
offset.x /= ASPECT_RATIO; // Correct back for sampling
// Sample with clamped coordinates to prevent edge artifacts
vec2 redCoord = clamp(v_texcoord - offset, 0.0, 1.0);
vec2 blueCoord = clamp(v_texcoord + offset, 0.0, 1.0);
float r = texture(tex, redCoord).r;
vec4 centerPixel = texture(tex, v_texcoord);
float g = centerPixel.g;
float b = texture(tex, blueCoord).b;
// Preserve alpha from center sample
fragColor = vec4(r, g, b, centerPixel.a);
}
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