gtk2/gsk/vulkan/resources/outset-shadow.frag

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GLSL
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#version 420 core
#include "clip.frag.glsl"
#include "rounded-rect.glsl"
layout(location = 0) in vec2 inPos;
layout(location = 1) in flat vec4 inOutline;
layout(location = 2) in flat vec4 inOutlineCornerWidths;
layout(location = 3) in flat vec4 inOutlineCornerHeights;
layout(location = 4) in flat vec4 inColor;
layout(location = 5) in flat vec2 inOffset;
layout(location = 6) in flat float inSpread;
layout(location = 7) in flat float inBlurRadius;
layout(location = 0) out vec4 color;
void main()
{
RoundedRect outline = RoundedRect (vec4(inOutline.xy, inOutline.xy + inOutline.zw), inOutlineCornerWidths, inOutlineCornerHeights);
RoundedRect outside = rounded_rect_shrink (outline, vec4(-inSpread));
color = vec4(inColor.rgb * inColor.a, inColor.a);
color = color * clamp (rounded_rect_coverage (outside, inPos - inOffset) -
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rounded_rect_coverage (outline, inPos),
0.0, 1.0);
color = clip (inPos, color);
}