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58 lines
1.9 KiB
GLSL
58 lines
1.9 KiB
GLSL
#version 420 core
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struct RoundedRect {
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vec4 bounds;
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vec4 corners;
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};
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layout(location = 0) in vec2 inPos;
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layout(location = 1) in vec2 inTexCoord;
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layout(location = 2) in flat vec4 inClipBounds;
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layout(location = 3) in flat vec4 inClipWidths;
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layout(set = 0, binding = 0) uniform sampler2D inTexture;
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layout(location = 0) out vec4 color;
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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float clip(vec2 pos, RoundedRect r) {
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vec2 ref_tl = r.bounds.xy + vec2( r.corners.x, r.corners.x);
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vec2 ref_tr = r.bounds.zy + vec2(-r.corners.y, r.corners.y);
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vec2 ref_br = r.bounds.zw + vec2(-r.corners.z, -r.corners.z);
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vec2 ref_bl = r.bounds.xw + vec2( r.corners.w, -r.corners.w);
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float d_tl = distance(pos, ref_tl);
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float d_tr = distance(pos, ref_tr);
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float d_br = distance(pos, ref_br);
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float d_bl = distance(pos, ref_bl);
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float pixels_per_fragment = length(fwidth(pos.xy));
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float nudge = 0.5 * pixels_per_fragment;
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vec4 distances = vec4(d_tl, d_tr, d_br, d_bl) - r.corners + nudge;
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bvec4 is_out = bvec4(pos.x < ref_tl.x && pos.y < ref_tl.y,
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pos.x > ref_tr.x && pos.y < ref_tr.y,
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pos.x > ref_br.x && pos.y > ref_br.y,
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pos.x < ref_bl.x && pos.y > ref_bl.y);
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float distance_from_border = dot(vec4(is_out),
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max(vec4(0.0, 0.0, 0.0, 0.0), distances));
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// Move the distance back into pixels.
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distance_from_border /= pixels_per_fragment;
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// Apply a more gradual fade out to transparent.
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//distance_from_border -= 0.5;
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return 1.0 - smoothstep(0.0, 1.0, distance_from_border);
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}
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void main()
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{
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RoundedRect r = RoundedRect(vec4(inClipBounds.xy, inClipBounds.xy + inClipBounds.zw), inClipWidths);
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color = texture (inTexture, inTexCoord) * clip (inPos, r);
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}
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