render-no-enabled-attrib-arrays.html

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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

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<html>

<head>

<title>Verify drawing without any enabled vertex attribute arrays</title>

<meta charset="utf-8">

<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 id='vshader' type='x-shader/x-vertex'>#version 300 es

layout(location=0) in vec4 inColor;

out vec4 varyingColor;

void main()

    varyingColor = inColor;

    gl_Position = vec4(0.0, 0.0, 0.0, 1.0);

    gl_PointSize = 1.0;

</script>

<script id='fshader' type='x-shader/x-fragment'>#version 300 es

precision mediump float;

in vec4 varyingColor;

layout(location=0) out vec4 oColor;

void main()

    oColor = varyingColor;

</script>

<script>

"use strict";

function runTest() {

    var wtu = WebGLTestUtils;

    var gl = wtu.create3DContext("testCanvas", undefined, 2);

    if (!gl) {

        testFailed('could not create context');

        return;

    var program = wtu.setupProgram(gl, ['vshader', 'fshader']);

    gl.disableVertexAttribArray(0);

    gl.vertexAttrib4f(0, 0.0, 1.0, 0.0, 1.0);

    gl.clearColor(1, 0, 0, 1);

    gl.clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT);

    gl.drawArrays(gl.POINTS, 0, 1);

    wtu.checkCanvas(gl, [ 0, 255, 0, 255 ], "Canvas should be covered by a single green point");

</script>

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<canvas id="testCanvas" width="1" height="1" style="width: 32px; height: 32px;"></canvas>

<div id="description"></div>

<div id="console"></div>

<script>

"use strict";

description();

runTest();

var successfullyParsed = true;

</script>

<script src="../../js/js-test-post.js"></script>

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