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50 行
1.8 KiB
50 行
1.8 KiB
uniform float4x4 UIWidgets_GUIClipMatrix;
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uniform float4 UIWidgets_GUIClipRect;
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uniform float4 UIWidgets_GUIClipRectRadius;
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half __getCornerAlpha (float2 p, float2 center, float radius, float pixelScale) {
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float2 v = p - center;
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float pixelCenterDist = length(v);
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float outerDist = (pixelCenterDist - radius) * pixelScale;
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half outerDistAlpha = saturate(0.5f - outerDist);
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return outerDistAlpha;
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}
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float getClipAlpha (float2 p, float pixelScale) {
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bool xIsLeft = (p.x - UIWidgets_GUIClipRect[0] - UIWidgets_GUIClipRect[2] / 2.0f) <= 0.0f;
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bool yIsTop = (p.y - UIWidgets_GUIClipRect[1] - UIWidgets_GUIClipRect[3] / 2.0f) <= 0.0f;
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int radiusIndex = 0;
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if (xIsLeft) {
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radiusIndex = yIsTop ? 0 : 3;
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} else {
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radiusIndex = yIsTop ? 1 : 2;
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}
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float activeRadius = UIWidgets_GUIClipRectRadius[radiusIndex];
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float2 center = float2(UIWidgets_GUIClipRect[0] + activeRadius, UIWidgets_GUIClipRect[1] + activeRadius);
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if (!xIsLeft) {
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center.x = (UIWidgets_GUIClipRect[0] + UIWidgets_GUIClipRect[2] - activeRadius);
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}
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if (!yIsTop) {
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center.y = (UIWidgets_GUIClipRect[1] + UIWidgets_GUIClipRect[3] - activeRadius);
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}
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float clipAlpha = 1.0f;
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bool isInCorner = (xIsLeft ? p.x <= center.x : p.x >= center.x) && (yIsTop ? p.y <= center.y : p.y >= center.y);
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float cornerAlpha = isInCorner ? __getCornerAlpha(p, center, activeRadius, pixelScale) : 1.0f;
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clipAlpha *= cornerAlpha;
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bool isInRect =
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p.x >= UIWidgets_GUIClipRect[0]
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&& p.x <= UIWidgets_GUIClipRect[0] + UIWidgets_GUIClipRect[2]
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&& p.y >= UIWidgets_GUIClipRect[1]
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&& p.y <= UIWidgets_GUIClipRect[1] + UIWidgets_GUIClipRect[3];
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float rectAlpha = isInRect ? 1.0f : 0.0f;
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clipAlpha *= rectAlpha;
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return clipAlpha;
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}
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