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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 19:33:14 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 19:33:14 +0000 |
commit | 36d22d82aa202bb199967e9512281e9a53db42c9 (patch) | |
tree | 105e8c98ddea1c1e4784a60a5a6410fa416be2de /dom/canvas/test/webgl-conf/checkout/conformance/ogles/GL2ExtensionTests/fwidth/fwidth_frag.frag | |
parent | Initial commit. (diff) | |
download | firefox-esr-36d22d82aa202bb199967e9512281e9a53db42c9.tar.xz firefox-esr-36d22d82aa202bb199967e9512281e9a53db42c9.zip |
Adding upstream version 115.7.0esr.upstream/115.7.0esrupstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'dom/canvas/test/webgl-conf/checkout/conformance/ogles/GL2ExtensionTests/fwidth/fwidth_frag.frag')
-rw-r--r-- | dom/canvas/test/webgl-conf/checkout/conformance/ogles/GL2ExtensionTests/fwidth/fwidth_frag.frag | 48 |
1 files changed, 48 insertions, 0 deletions
diff --git a/dom/canvas/test/webgl-conf/checkout/conformance/ogles/GL2ExtensionTests/fwidth/fwidth_frag.frag b/dom/canvas/test/webgl-conf/checkout/conformance/ogles/GL2ExtensionTests/fwidth/fwidth_frag.frag new file mode 100644 index 0000000000..ebe8461533 --- /dev/null +++ b/dom/canvas/test/webgl-conf/checkout/conformance/ogles/GL2ExtensionTests/fwidth/fwidth_frag.frag @@ -0,0 +1,48 @@ + +/* +Copyright (c) 2019 The Khronos Group Inc. +Use of this source code is governed by an MIT-style license that can be +found in the LICENSE.txt file. +*/ + + +#ifdef GL_ES +#extension GL_OES_standard_derivatives : enable +precision mediump float; +#endif + +// setting a boundary for cases where screen sizes may exceed the precision +// of the arithmetic used. +#define SAFETY_BOUND 500.0 + +// Macro to scale/bias the range of output. If input is [-1.0, 1.0], maps to [0.5, 1.0].. +// Accounts for precision errors magnified by derivative operation. +#define REDUCE_RANGE(A) ((A) + 3.0) / 4.0 + + +varying vec2 vertXY; + +uniform float viewportwidth; +uniform float viewportheight; + +void main (void) +{ + const float M_PI = 3.14159265358979323846; + float func; + float funcfwidth; + +#ifdef GL_OES_standard_derivatives + // fwidth of average of horizontal and vertical sine waves with periods of 128 pixels, scaled to go from -1 to +1 + func = 0.5 * (sin(fract(gl_FragCoord.x / 128.0) * (2.0 * M_PI)) + sin(fract(gl_FragCoord.y / 128.0) * (2.0 * M_PI))); + funcfwidth = REDUCE_RANGE((128.0 / (2.0 * M_PI)) * fwidth(func)); +#else + funcfwidth = 0.5; +#endif + + if( (gl_FragCoord.x < SAFETY_BOUND) && (gl_FragCoord.y < SAFETY_BOUND) ) + { + gl_FragColor = vec4(funcfwidth, funcfwidth, funcfwidth, 1.0); + } + else discard; +} + |