303 lines
11 KiB
GLSL
303 lines
11 KiB
GLSL
#version 440
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layout(location = 0) in vec2 qt_TexCoord0;
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layout(location = 0) out vec4 fragColor;
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layout(std140, binding = 0) uniform buf {
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mat4 qt_Matrix;
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float qt_Opacity;
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float paddedX;
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float paddedY;
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float paddedW;
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float paddedH;
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float smoothFactor;
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int rectCount;
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int myIndex;
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vec4 color;
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int hasInverted;
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float invertedRadius;
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vec4 invertedOuter;
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vec4 invertedInner;
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vec4 rectData[80];
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};
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float sdRoundedBox(vec2 p, vec2 center, vec2 halfSize, float radius) {
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vec2 d = abs(p - center) - halfSize + vec2(radius);
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return length(max(d, vec2(0.0))) + min(max(d.x, d.y), 0.0) - radius;
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}
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float sdRoundedBox4(vec2 p, vec2 center, vec2 halfSize, vec4 r) {
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// r = (topRight, bottomRight, bottomLeft, topLeft)
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p -= center;
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r.xy = (p.x > 0.0) ? r.xy : r.wz;
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r.x = (p.y > 0.0) ? r.y : r.x;
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vec2 q = abs(p) - halfSize + r.x;
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return min(max(q.x, q.y), 0.0) + length(max(q, 0.0)) - r.x;
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}
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float sdBox(vec2 p, vec2 center, vec2 halfSize) {
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vec2 d = abs(p - center) - halfSize;
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return length(max(d, vec2(0.0))) + min(max(d.x, d.y), 0.0);
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}
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float smin(float a, float b, float k) {
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// Cubic smooth min (C2 continuous — no curvature kinks at blend boundary)
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float h = max(k - abs(a - b), 0.0) / k;
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return min(a, b) - h * h * h * k * (1.0 / 6.0);
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}
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float smax(float a, float b, float k) {
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float h = max(k - abs(a - b), 0.0) / k;
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return max(a, b) + h * h * h * k * (1.0 / 6.0);
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}
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float smaxSharpA(float a, float b, float k) {
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// smax variant that keeps a's boundary sharp (no inward rounding at a = 0).
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// Used for the frame outer edge so it always fills to the edges.
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float h = max(k - abs(a - b), 0.0) / k;
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float blend = h * h * h * k * (1.0 / 6.0);
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blend *= smoothstep(0.0, k * 0.5, -a);
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return max(a, b) + blend;
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}
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void main() {
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vec2 pixel = vec2(paddedX, paddedY) + qt_TexCoord0 * vec2(paddedW, paddedH);
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float mergedSdf = 1e10;
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int owner = -2;
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float minDist = 1e10;
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for (int i = 0; i < rectCount; i++) {
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vec4 rect = rectData[i * 5]; // cx, cy, hw, hh
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vec4 props = rectData[i * 5 + 1]; // radius, offsetX, offsetY, minEig
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vec4 invDm = rectData[i * 5 + 2]; // inverse deform matrix
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vec4 sh = rectData[i * 5 + 3]; // screenHalfX, screenHalfY, 0, 0
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vec4 radii =
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rectData[i * 5 + 4]; // effective per-corner radii (tr, br, bl, tl)
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// Offset center for asymmetric deformation
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vec2 center = rect.xy + props.yz;
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// AABB early-out: skip rects far from this pixel
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vec2 extent = sh.xy + vec2(smoothFactor * 1.5);
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if (abs(pixel.x - center.x) > extent.x ||
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abs(pixel.y - center.y) > extent.y)
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continue;
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// Apply pre-computed inverse deformation to the evaluation point
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mat2 invDeform = mat2(invDm.xy, invDm.zw);
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vec2 transformedPixel = center + invDeform * (pixel - center);
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// Use pre-computed effective per-corner radii
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float d = sdRoundedBox4(transformedPixel, center, rect.zw, radii);
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// Use pre-computed minimum eigenvalue for SDF correction
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d *= max(props.w, 0.01);
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// Scale SDF on the axis facing a nearby border to narrow the smin blend
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// zone in that direction only, without reducing k (which would cause sharp
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// edges).
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if (hasInverted != 0) {
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vec2 screenHalf = sh.xy;
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float distY0 =
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(center.y + screenHalf.y) - (invertedInner.y - invertedInner.w);
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float distY1 =
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(invertedInner.y + invertedInner.w) - (center.y - screenHalf.y);
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float distX0 =
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(center.x + screenHalf.x) - (invertedInner.x - invertedInner.z);
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float distX1 =
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(invertedInner.x + invertedInner.z) - (center.x - screenHalf.x);
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// 0 = far from border, 1 = at border (max compression)
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float yProx = 1.0 - min(smoothstep(0.0, smoothFactor, distY0),
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smoothstep(0.0, smoothFactor, distY1));
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float xProx = 1.0 - min(smoothstep(0.0, smoothFactor, distX0),
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smoothstep(0.0, smoothFactor, distX1));
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// Smooth axis weights: gradient-based at corners, face-based inside.
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vec2 q = abs(pixel - center) - screenHalf;
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vec2 qp = max(q, vec2(0.0));
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float cornerLen = length(qp);
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// Gradient direction in corner region (smooth 90-degree rotation)
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float gradX = qp.x / max(cornerLen, 0.001);
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float gradY = qp.y / max(cornerLen, 0.001);
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// Smooth face weights for inside/edge (no hard branch)
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float faceY = smoothstep(-4.0, 4.0, q.y - q.x);
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float faceX = 1.0 - faceY;
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// Blend: gradient in corner region, face-based inside
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float t = smoothstep(0.0, 2.0, cornerLen);
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float xWeight = mix(faceX, gradX, t);
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float yWeight = mix(faceY, gradY, t);
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float boost = 3.0;
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float scale = 1.0 + (xProx * xWeight + yProx * yWeight) * boost;
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d *= scale;
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}
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// Rect-to-rect edge sinks: track the same edge of neighboring rects
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{
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float rectSinkValue = 0.0;
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vec2 iHalf = sh.xy;
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float preOff = smoothFactor * (1.0 / 6.0);
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for (int j = 0; j < rectCount; j++) {
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if (j == i)
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continue;
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vec4 jRect = rectData[j * 5];
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vec4 jProps = rectData[j * 5 + 1];
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vec2 jSh = rectData[j * 5 + 3].xy;
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vec2 jCtr = jRect.xy + jProps.yz;
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// Per-edge containment: the other rect's full span on the
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// perpendicular axis must be inside this rect for that edge.
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bool hInside = (jCtr.y - jSh.y) >= (center.y - iHalf.y) &&
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(jCtr.y + jSh.y) <= (center.y + iHalf.y);
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bool vInside = (jCtr.x - jSh.x) >= (center.x - iHalf.x) &&
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(jCtr.x + jSh.x) <= (center.x + iHalf.x);
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// Top/Bottom: other rect's height must be inside this rect
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float topPen =
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hInside ? clamp((center.y - iHalf.y) - (jCtr.y - jSh.y) - preOff,
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0.0, smoothFactor)
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: 0.0;
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float botPen =
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hInside ? clamp((jCtr.y + jSh.y) - (center.y + iHalf.y) - preOff,
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0.0, smoothFactor)
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: 0.0;
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// Left/Right: other rect's width must be inside this rect
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float leftPen =
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vInside ? clamp((center.x - iHalf.x) - (jCtr.x - jSh.x) - preOff,
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0.0, smoothFactor)
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: 0.0;
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float rightPen =
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vInside ? clamp((jCtr.x + jSh.x) - (center.x + iHalf.x) - preOff,
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0.0, smoothFactor)
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: 0.0;
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// Lateral distance from pixel to other rect's extent along each edge
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float hLat = max(abs(pixel.x - jCtr.x) - jSh.x, 0.0);
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float vLat = max(abs(pixel.y - jCtr.y) - jSh.y, 0.0);
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// Perpendicular proximity: full strength at edge, fade inside
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float topZone =
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1.0 - smoothstep(center.y - iHalf.y,
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center.y - iHalf.y + smoothFactor, pixel.y);
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float botZone = smoothstep(center.y + iHalf.y - smoothFactor,
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center.y + iHalf.y, pixel.y);
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float leftZone =
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1.0 - smoothstep(center.x - iHalf.x,
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center.x - iHalf.x + smoothFactor, pixel.x);
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float rightZone = smoothstep(center.x + iHalf.x - smoothFactor,
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center.x + iHalf.x, pixel.x);
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float s = smoothFactor * 2.0;
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float sink = max(max(topPen * smoothstep(s, 0.0, hLat) * topZone,
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botPen * smoothstep(s, 0.0, hLat) * botZone),
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max(leftPen * smoothstep(s, 0.0, vLat) * leftZone,
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rightPen * smoothstep(s, 0.0, vLat) * rightZone));
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rectSinkValue = max(rectSinkValue, sink);
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}
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d -= rectSinkValue;
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}
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mergedSdf = smin(mergedSdf, d, smoothFactor);
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if (d < smoothFactor && d < minDist) {
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minDist = d;
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owner = i;
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}
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}
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if (hasInverted != 0) {
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float dOuter = sdBox(pixel, invertedOuter.xy, invertedOuter.zw) - 1.0;
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float dInner =
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sdRoundedBox(pixel, invertedInner.xy, invertedInner.zw, invertedRadius);
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// Border sinks: track the opposite rect edge, clamped to border thickness
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float innerTop = invertedInner.y - invertedInner.w;
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float innerBot = invertedInner.y + invertedInner.w;
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float innerLeft = invertedInner.x - invertedInner.z;
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float innerRight = invertedInner.x + invertedInner.z;
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float outerTop = invertedOuter.y - invertedOuter.w;
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float outerBot = invertedOuter.y + invertedOuter.w;
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float outerLeft = invertedOuter.x - invertedOuter.z;
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float outerRight = invertedOuter.x + invertedOuter.z;
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float sinkValue = 0.0;
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for (int i = 0; i < rectCount; i++) {
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vec4 rect = rectData[i * 5];
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vec4 sinkProps = rectData[i * 5 + 1];
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vec2 sinkSh = rectData[i * 5 + 3].xy;
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// Screen-space center (with offset) and pre-computed AABB half-extents
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vec2 ctr = rect.xy + sinkProps.yz;
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// Delay sink to absorb smin blend depth (cubic smin max = k/6)
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float preOff = smoothFactor * (1.0 / 6.0);
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// Top border: track rect's BOTTOM edge, only within border thickness
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float topPen = clamp(innerTop - (ctr.y + sinkSh.y) - preOff, 0.0,
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innerTop - outerTop);
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// Bottom border: track rect's TOP edge
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float botPen = clamp((ctr.y - sinkSh.y) - innerBot - preOff, 0.0,
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outerBot - innerBot);
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// Left border: track rect's RIGHT edge
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float leftPen = clamp(innerLeft - (ctr.x + sinkSh.x) - preOff, 0.0,
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innerLeft - outerLeft);
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// Right border: track rect's LEFT edge
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float rightPen = clamp((ctr.x - sinkSh.x) - innerRight - preOff, 0.0,
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outerRight - innerRight);
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// Lateral distance from pixel to rect's extent along each edge
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float hLat = max(abs(pixel.x - ctr.x) - sinkSh.x, 0.0);
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float vLat = max(abs(pixel.y - ctr.y) - sinkSh.y, 0.0);
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// Perpendicular proximity: full strength in border, fade inside inner
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// area
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float topZone =
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1.0 - smoothstep(innerTop, innerTop + smoothFactor, pixel.y);
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float botZone = smoothstep(innerBot - smoothFactor, innerBot, pixel.y);
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float leftZone =
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1.0 - smoothstep(innerLeft, innerLeft + smoothFactor, pixel.x);
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float rightZone =
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smoothstep(innerRight - smoothFactor, innerRight, pixel.x);
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float s = smoothFactor * 2.0;
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float sink = max(max(topPen * smoothstep(s, 0.0, hLat) * topZone,
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botPen * smoothstep(s, 0.0, hLat) * botZone),
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max(leftPen * smoothstep(s, 0.0, vLat) * leftZone,
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rightPen * smoothstep(s, 0.0, vLat) * rightZone));
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sinkValue = max(sinkValue, sink);
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}
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dInner -= sinkValue;
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float dFrame = smaxSharpA(dOuter, -dInner, smoothFactor);
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mergedSdf = smin(mergedSdf, dFrame, smoothFactor);
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if (dFrame < minDist) {
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owner = -1;
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}
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}
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// Each renderer only outputs pixels it owns, but allow rendering
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// blend zones to prevent gaps (mergedSdf < smoothFactor means in blend)
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// myIndex == -1: inverted rect renders border-owned pixels
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// myIndex >= 0: individual rect renders its owned pixels
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if (owner != myIndex && mergedSdf > smoothFactor)
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discard;
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float fw = fwidth(mergedSdf);
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float alpha = 1.0 - smoothstep(-fw, fw, mergedSdf);
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fragColor = vec4(color.rgb * alpha, alpha) * qt_Opacity;
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}
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