diff options
Diffstat (limited to '')
-rw-r--r-- | dom/canvas/test/webgl-conf/checkout/conformance/glsl/bugs/modulo-arithmetic-accuracy.html | 68 |
1 files changed, 68 insertions, 0 deletions
diff --git a/dom/canvas/test/webgl-conf/checkout/conformance/glsl/bugs/modulo-arithmetic-accuracy.html b/dom/canvas/test/webgl-conf/checkout/conformance/glsl/bugs/modulo-arithmetic-accuracy.html new file mode 100644 index 0000000000..6e39f69ab7 --- /dev/null +++ b/dom/canvas/test/webgl-conf/checkout/conformance/glsl/bugs/modulo-arithmetic-accuracy.html @@ -0,0 +1,68 @@ +<!-- +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. +--> + +<!-- author: Bill Baxter (wbaxter at google.com) --> + +<!DOCTYPE html> +<html> +<head> +<meta charset="utf-8"> +<title>Modulo Arithmetic Accuracy Bug</title> +<link rel="stylesheet" href="../../../resources/js-test-style.css"/> +<script src="../../../js/js-test-pre.js"></script> +<script src="../../../js/webgl-test-utils.js"></script> +<script src="../../../js/glsl-conformance-test.js"></script> +</head> + +<body> +<div id="description"></div> +<div id="console"></div> + +<script id="shader-vs" type="x-shader/x-vertex"> +attribute vec4 vPosition; +uniform float divisor; +varying vec4 vColor; +void main(void) { + gl_Position = vPosition; + float index = 9.0; + // mod(x, y) is computed as x-y*floor(x/y). There are no guarantees on + // the precision of floating point operations in WebGL shaders, but division + // should be accurate to at least 1 part in 10^5. + float value = mod(index * 1.00001, divisor); + vColor = (value < 1.) ? vec4(0, 1, 0, 1) : vec4(1, 0, 0, 1); +} +</script> + +<script id="shader-fs" type="x-shader/x-fragment"> +precision mediump float; +varying vec4 vColor; +void main(void) { + gl_FragColor = vColor; +} +</script> +<script> +"use strict"; + +description(); +debug(""); +// Reproduces bug seen on Mac OS X with AMD Radeon HD 6490 GPU +debug("If things are working correctly, then the square will be green."); +debug("If your card thinks mod(9,3) is not 0, then the square will be red."); + +GLSLConformanceTester.runRenderTests([ +{ + vShaderId: 'shader-vs', + vShaderSuccess: true, + fShaderId: 'shader-fs', + fShaderSuccess: true, + linkSuccess: true, + passMsg: 'Test that mod(9/3) is 0', + uniforms: [{name: "divisor", functionName: "uniform1f", value: 3}] +} +]); +</script> +</body> +</html> |