<!--
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>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>
</head>
<body>
<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>
</body>
</html>
