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#version 450
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 widthPx;
float heightPx;
float cornerRadiusPx;
float rippleCenterX;
float rippleCenterY;
float rippleRadius;
float rippleOpacity;
float offsetX;
float offsetY;
float parentWidth;
float parentHeight;
vec4 rippleCol;
} ubuf;
float sdRoundRect(vec2 p, vec2 b, float r) {
vec2 q = abs(p) - (b - vec2(r));
return length(max(q, 0.0)) + min(max(q.x, q.y), 0.0) - r;
}
void main() {
if (ubuf.rippleOpacity <= 0.0 || ubuf.rippleRadius <= 0.0) {
fragColor = vec4(0.0);
return;
}
vec2 px = qt_TexCoord0 * vec2(ubuf.widthPx, ubuf.heightPx) + vec2(ubuf.offsetX, ubuf.offsetY);
float circleD = length(px - vec2(ubuf.rippleCenterX, ubuf.rippleCenterY)) - ubuf.rippleRadius;
float aaCircle = max(fwidth(circleD), 0.001);
float circleMask = 1.0 - smoothstep(-aaCircle, aaCircle, circleD);
if (circleMask <= 0.0) {
fragColor = vec4(0.0);
return;
}
float rrMask = 1.0;
if (ubuf.cornerRadiusPx > 0.0) {
vec2 halfSize = vec2(ubuf.parentWidth, ubuf.parentHeight) * 0.5;
float r = clamp(ubuf.cornerRadiusPx, 0.0, min(halfSize.x, halfSize.y));
float rrD = sdRoundRect(px - halfSize, halfSize, r);
float aaRR = max(fwidth(rrD), 0.001);
rrMask = 1.0 - smoothstep(-aaRR, aaRR, rrD);
}
float mask = circleMask * rrMask;
if (mask <= 0.0) {
fragColor = vec4(0.0);
return;
}
float a = ubuf.rippleCol.a * ubuf.rippleOpacity * mask * ubuf.qt_Opacity;
fragColor = vec4(ubuf.rippleCol.rgb * a, a);
}
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