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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!
44 lines
1.7 KiB
GLSL
44 lines
1.7 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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// `vBorderPosition` is the position of the source texture in the atlas.
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float gauss(float x, float sigma) {
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return (1.0 / sqrt(6.283185307179586 * sigma * sigma)) * exp(-(x * x) / (2.0 * sigma * sigma));
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}
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void main(void) {
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#ifdef SERVO_ES2
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// TODO(gw): for loops have to be unrollable on es2.
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SetFragColor(vec4(1.0, 0.0, 0.0, 1.0));
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#else
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vec2 sideOffsets = (vDestTextureSize - vSourceTextureSize) / 2.0;
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int range = int(vBlurRadius) * 3;
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float sigma = vBlurRadius / 2.0;
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vec4 value = vec4(0.0);
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vec2 sourceTextureUvOrigin = vBorderPosition.xy;
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vec2 sourceTextureUvSize = vBorderPosition.zw - sourceTextureUvOrigin;
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for (int offset = -range; offset <= range; offset++) {
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float offsetF = float(offset);
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vec2 lColorTexCoord = (vColorTexCoord.xy * vDestTextureSize - sideOffsets) /
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vSourceTextureSize;
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lColorTexCoord += vec2(offsetF) / vSourceTextureSize * uDirection;
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vec4 x = lColorTexCoord.x >= 0.0 &&
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lColorTexCoord.x <= 1.0 &&
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lColorTexCoord.y >= 0.0 &&
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lColorTexCoord.y <= 1.0 ?
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Texture(sDiffuse, lColorTexCoord * sourceTextureUvSize + sourceTextureUvOrigin) :
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vec4(0.0);
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// Alpha must be premultiplied in order to properly blur the alpha channel.
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value += vec4(x.rgb * x.a, x.a) * gauss(offsetF, sigma);
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}
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// Unpremultiply the alpha.
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value = vec4(value.rgb / value.a, value.a);
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SetFragColor(value);
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#endif
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}
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