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vulkan: Compute right size for outset shadow

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We were emitting the box and not the shadow box as the rectangle. So we
didn't draw any shadows. Oops.
This commit is contained in:
Benjamin Otte 2017-01-18 16:39:27 +01:00
parent fb47a8d714
commit cde933ebd9
1 changed files with 11 additions and 1 deletions
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12
gsk/resources/vulkan/outset-shadow.vert
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@ -17,6 +17,7 @@ layout(location = 3) out flat vec4 outOutlineCornerHeights;
layout(location = 4) out flat vec4 outColor;
layout(location = 5) out flat vec2 outOffset;
layout(location = 6) out flat float outSpread;
layout(location = 7) out flat float outBlurRadius;
out gl_PerVertex {
vec4 gl_Position;
@ -29,8 +30,16 @@ vec2 offsets[6] = { vec2(0.0, 0.0),
vec2(1.0, 0.0),
vec2(1.0, 1.0) };
float radius_pixels(float radius) {
return radius * (3.0 * sqrt(2 * 3.141592653589793) / 4) * 1.5;
}
void main() {
vec4 rect = clip (inOutline);
vec4 rect = inOutline;
float spread = inSpread + radius_pixels(inBlurRadius);
rect += vec4(inOffset - spread, vec2(2 * spread));
clip (inOutline);
vec2 pos = rect.xy + rect.zw * offsets[gl_VertexIndex];
gl_Position = push.mvp * vec4 (pos, 0.0, 1.0);
@ -42,4 +51,5 @@ void main() {
outColor = inColor;
outOffset = inOffset;
outSpread = inSpread;
outBlurRadius = inBlurRadius;
}