lets go

gui/gnome/autocustom-gnome-macos/res/extensions/blur-my-shell@aunetx/effects/corner.glsl

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+// Heavily based on https://github.com/yilozt/rounded-window-corners
+// which is itself based on upstream Mutter code
+
+uniform sampler2D tex;
+uniform float radius;
+uniform float width;
+uniform float height;
+uniform bool corners_top;
+uniform bool corners_bottom;
+
+uniform float clip_x0;
+uniform float clip_y0;
+uniform float clip_width;
+uniform float clip_height;
+
+float circle_bounds(vec2 p, vec2 center, float clip_radius) {
+    vec2 delta = p - center;
+    float dist_squared = dot(delta, delta);
+
+    float outer_radius = clip_radius + 0.5;
+    if (dist_squared >= (outer_radius * outer_radius))
+        return 0.0;
+
+    float inner_radius = clip_radius - 0.5;
+    if (dist_squared <= (inner_radius * inner_radius))
+        return 1.0;
+
+    return outer_radius - sqrt(dist_squared);
+}
+
+vec4 getTexture(vec2 uv) {
+    if (uv.x < 2. / width)
+        uv.x = 2. / width;
+
+    if (uv.y < 2. / height)
+        uv.y = 2. / height;
+
+    if (uv.x > 1. - 3. / width)
+        uv.x = 1. - 3. / width;
+
+    if (uv.y > 1. - 3. / height)
+        uv.y = 1. - 3. / height;
+
+    return texture2D(tex, uv);
+}
+
+float rounded_rect_coverage(vec2 p, vec4 bounds, float clip_radius) {
+    // Outside the bounds
+    if (p.x < bounds.x || p.x > bounds.z || p.y < bounds.y || p.y > bounds.w) {
+        return 0.;
+    }
+
+    vec2 center;
+
+    float center_left = bounds.x + clip_radius;
+    float center_right = bounds.z - clip_radius;
+
+    if (p.x < center_left)
+        center.x = center_left + 2.;
+    else if (p.x > center_right)
+        center.x = center_right - 1.;
+    else
+        return 1.0;
+
+    float center_top = bounds.y + clip_radius;
+    float center_bottom = bounds.w - clip_radius;
+
+    if (corners_top && p.y < center_top)
+        center.y = center_top + 2.;
+    else if (corners_bottom && p.y > center_bottom)
+        center.y = center_bottom - 1.;
+    else
+        return 1.0;
+
+    return circle_bounds(p, center, clip_radius);
+}
+
+void main(void) {
+    vec2 uv = cogl_tex_coord_in[0].xy;
+    vec2 pos = uv * vec2(width, height);
+    vec4 c = getTexture(uv);
+
+    vec4 bounds;
+    if (clip_width < 0. || clip_height < 0.) {
+        bounds = vec4(clip_x0, clip_y0, clip_x0 + width, clip_y0 + height);
+    } else {
+        bounds = vec4(clip_x0, clip_y0, clip_x0 + clip_width, clip_y0 + clip_height);
+    }
+
+    float alpha = rounded_rect_coverage(pos, bounds, radius);
+
+    cogl_color_out = vec4(c.rgb * alpha, min(alpha, c.a));
+}