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<!--
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.
-->
<!DOCTYPE html>
<html>
<head>
<title>WebGL 2 Normalized Vertex Attributes Conformance Test</title>
<meta charset="utf-8">
<link rel="stylesheet" href="../../resources/js-test-style.css"/>
</head>
<body>
<canvas width=1 height=1></canvas>
<div id="description"></div>
<div id="console"></div>
<script id="vertex-shader" type="x-shader/x-vertex">#version 300 es
layout(location = 0) in vec3 vertex;
out float normAttrib;
void main(void) {
gl_Position = vec4(vertex.xy, 0, 1);
normAttrib = vertex.z;
}
</script>
<script id="fragment-shader" type="x-shader/x-fragment">#version 300 es
in lowp float normAttrib;
layout(location=0) out lowp vec4 fragColor;
void main(void) {
fragColor = vec4(vec3(normAttrib == -1.0 ? 1.0 : 0.0), 1);
}
</script>
<script src="../../js/js-test-pre.js"></script>
<script src="../../js/webgl-test-utils.js"></script>
<script>
(function () {
'use strict';
var wtu = WebGLTestUtils;
var gl = wtu.create3DContext(document.querySelector('canvas'), null, 2);
var program = wtu.setupProgram(gl, ['vertex-shader', 'fragment-shader']);
gl.useProgram(program);
var buffer = gl.createBuffer();
gl.bindBuffer(gl.ARRAY_BUFFER, buffer);
gl.bufferData(gl.ARRAY_BUFFER, new Int8Array([
// Here we set the third component (the one that's actually tested)
// to (MIN_INT + 1). If non-zero-preserving rules are used, it'll be
// converted to a float that's slightly greater than -1. If zero-preserving
// rules are used, as the GLES 3 spec requires, result of conversion
// should be exactly -1.
-0x80, 0x7f, -0x7f,
0x7f, 0x7f, -0x7f,
-0x80, -0x7f, -0x7f,
-0x80, -0x7f, -0x7f,
0x7f, 0x7f, -0x7f,
0x7f, -0x80, -0x7f
]), gl.STATIC_DRAW);
gl.enableVertexAttribArray(0);
gl.vertexAttribPointer(0, 3, gl.BYTE, true, 0, 0);
gl.drawArrays(gl.TRIANGLE_STRIP, 0, 6);
wtu.checkCanvas(gl, [255, 255, 255, 255], "should be opaque white");
}());
</script>
<script>
description('Verify that conversion of normalized signed int attributes to floats uses zero-preserving rule.');
window.successfullyParsed = true;
</script>
<script src="../../js/js-test-post.js"></script>
</body>
</html>
|
