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c0531c312f
WebRender is an experimental GPU accelerated rendering backend for Servo. The WebRender backend can be specified by running Servo with the -w option (otherwise the default rendering backend will be used). WebRender has many bugs, and missing features - but it is usable to browse most websites - please report any WebRender specific rendering bugs you encounter!
41 lines
1.3 KiB
GLSL
41 lines
1.3 KiB
GLSL
/* 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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/*
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Ellipse equation:
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(x-h)^2 (y-k)^2
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------- + ------- <= 1
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rx^2 ry^2
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*/
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float Value(vec2 position) {
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float outer_rx = vBorderRadii.x;
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float outer_ry = vBorderRadii.y;
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float outer_dx = position.x * position.x / (outer_rx * outer_rx);
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float outer_dy = position.y * position.y / (outer_ry * outer_ry);
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if (outer_dx + outer_dy > 1.0)
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return 0.0;
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float inner_rx = vBorderRadii.z;
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float inner_ry = vBorderRadii.w;
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if (inner_rx == 0.0 || inner_ry == 0.0)
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return 1.0;
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float inner_dx = position.x * position.x / (inner_rx * inner_rx);
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float inner_dy = position.y * position.y / (inner_ry * inner_ry);
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return inner_dx + inner_dy >= 1.0 ? 1.0 : 0.0;
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}
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void main(void)
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{
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vec2 position = vPosition - vBorderPosition.xy;
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vec4 pixelBounds = vec4(floor(position.x), floor(position.y),
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ceil(position.x), ceil(position.y));
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float value = (Value(pixelBounds.xy) + Value(pixelBounds.zy) +
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Value(pixelBounds.xw) + Value(pixelBounds.zw)) / 4.0;
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SetFragColor(vec4(vColor.rgb, mix(1.0 - vColor.a, vColor.a, value)));
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}
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