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#version 440
layout(location = 0) in vec2 qt_TexCoord0;
layout(location = 0) out vec4 fragColor;
layout(std140, binding = 0) uniform buf {
mat4 qt_Matrix;
float qt_Opacity;
float width;
float height;
float cornerRadius;
float strokeWidth;
vec4 fillColor;
vec4 strokeColor;
} ubuf;
float squircleSDF(vec2 p, vec2 size, float r) {
vec2 q = abs(p) - size + vec2(r);
vec2 cornerSpace = max(q, 0.0);
float p_norm = pow(cornerSpace.x, 4.5) + pow(cornerSpace.y, 4.5);
float cornerDist = pow(p_norm, 1.0 / 4.5);
return cornerDist + min(max(q.x, q.y), 0.0) - r;
}
void main() {
vec2 halfSize = vec2(ubuf.width, ubuf.height) * 0.5;
vec2 p = (qt_TexCoord0 * vec2(ubuf.width, ubuf.height)) - halfSize;
// Applied the scaling factor mentioned in the original comment
float r = ubuf.cornerRadius * 1.5286;
float dist = squircleSDF(p, halfSize, r);
float fwidth_dist = fwidth(dist);
// Corrected edge parameter order to avoid undefined behavior
float alpha = 1.0 - smoothstep(-fwidth_dist, fwidth_dist, dist);
if (ubuf.strokeWidth > 0.0) {
float innerDist = dist + ubuf.strokeWidth;
float innerAlpha = 1.0 - smoothstep(-fwidth_dist, fwidth_dist, innerDist);
vec4 color = mix(ubuf.strokeColor, ubuf.fillColor, innerAlpha);
fragColor = color * alpha * ubuf.qt_Opacity;
} else {
fragColor = ubuf.fillColor * alpha * ubuf.qt_Opacity;
}
}
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