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<!--
Copyright (c) 2020 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.
-->
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Verify precision side effects (Adreno driver 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>
</head>
<body>
<canvas id="canvas" width="2" height="2"> </canvas>
<div id="description"></div>
<div id="console"></div>
<script id="vshader-simple" type="x-shader/x-vertex">#version 300 es
in vec3 aPosition;
void main() {
gl_Position = vec4(aPosition, 1.0);
}
</script>
<script id="fshader-int" type="x-shader/x-fragment">#version 300 es
out highp vec4 myFragColor;
void main() {
highp int t;
t = 0 | (int(t == t) * 0x8000);
if (t == 0x8000)
myFragColor = vec4(1.0, 0.0, 0.0, 1.0);
else
myFragColor = vec4(0.0, 0.0, 0.0, 1.0);
}
</script>
<script id="fshader-ivec2" type="x-shader/x-fragment">#version 300 es
out highp vec4 myFragColor;
void main() {
highp ivec2 t;
t = 0 | (ivec2(t == t) * 0x8000);
if (t == ivec2(0x8000))
myFragColor = vec4(1.0, 0.0, 0.0, 1.0);
else
myFragColor = vec4(0.0, 0.0, 0.0, 1.0);
}
</script>
<script id="fshader-ivec3" type="x-shader/x-fragment">#version 300 es
out highp vec4 myFragColor;
void main() {
highp ivec3 t;
t = 0 | (ivec3(t == t) * 0x8000);
if (t == ivec3(0x8000))
myFragColor = vec4(1.0, 0.0, 0.0, 1.0);
else
myFragColor = vec4(0.0, 0.0, 0.0, 1.0);
}
</script>
<script id="fshader-ivec4" type="x-shader/x-fragment">#version 300 es
out highp vec4 myFragColor;
void main() {
highp ivec4 t;
t = 0 | (ivec4(t == t) * 0x8000);
if (t == ivec4(0x8000))
myFragColor = vec4(1.0, 0.0, 0.0, 1.0);
else
myFragColor = vec4(0.0, 0.0, 0.0, 1.0);
}
</script>
<script type="application/javascript">
"use strict";
description("Verify precision side effects");
debug("");
debug("When this test is run on Adreno (no repros on other vendors so far):");
debug(" - the result of the expression 0 | (int(e0 == e0) * 0x8000) somehow returns -32768 instead of 32768 despite the variable using highp precision;");
debug(" - splitting the expression along | fixes the issue (could also be observed with other operators).");
debug('For additional reference see this <a href="https://github.com/KhronosGroup/WebGL/pull/3192">pull request</a> and <a href="http://crbug.com/1155942">Chromium bug</a>');
debug("");
var wtu = WebGLTestUtils;
function test() {
var gl = wtu.create3DContext("canvas", undefined, 2);
if (!gl) {
testFailed("context does not exist");
return;
}
wtu.setupUnitQuad(gl);
var testCases = [
{ vshader: "vshader-simple", fshader: "fshader-int", desc: "fragment shader int" },
{ vshader: "vshader-simple", fshader: "fshader-ivec2", desc: "fragment shader ivec2" },
{ vshader: "vshader-simple", fshader: "fshader-ivec3", desc: "fragment shader ivec3" },
{ vshader: "vshader-simple", fshader: "fshader-ivec4", desc: "fragment shader ivec4" },
];
for (var idx = 0; idx < testCases.length; ++idx) {
var test = testCases[idx];
debug("");
var program = wtu.setupProgram(gl, [test.vshader, test.fshader], ["aPosition"]);
if (!program) {
testFailed("Fail to set up program");
} else {
debug("Testing " + test.desc);
wtu.drawUnitQuad(gl);
wtu.checkCanvas(gl, [255, 0, 0, 255]);
gl.deleteProgram(program);
wtu.glErrorShouldBe(gl, gl.NO_ERROR, "Should be no errors from testing");
}
}
};
test();
debug("");
var successfullyParsed = true;
</script>
<script src="../../js/js-test-post.js"></script>
</body>
</html>
|
