<!--
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>
<meta charset="utf-8">
<title>Rendering Test</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="example" width="50" height="50">
There is supposed to be an example drawing here, but it's not important.
</canvas>
<div id="description"></div>
<div id="console"></div>
<script id="vshader" type="x-shader/x-vertex">
attribute vec4 vPosition;
void main()
{
    gl_Position = vPosition;
}
</script>

<script id="fshader" type="x-shader/x-fragment">
void main()
{
    gl_FragColor = vec4(1.0,0.0,0.0,1.0);
}
</script>

<script>
"use strict";
function init()
{
    description(document.title);

    var wtu = WebGLTestUtils;
    var gl = wtu.create3DContext("example");
    var program = wtu.setupProgram(gl, ["vshader", "fshader"], ["vPosition"]);

    var vertexObject = gl.createBuffer();
    gl.bindBuffer(gl.ARRAY_BUFFER, vertexObject);
    gl.bufferData(gl.ARRAY_BUFFER, new Float32Array([ 0,0.5,0, -0.5,-0.5,0, 0.5,-0.5,0 ]), gl.STATIC_DRAW);
    gl.enableVertexAttribArray(0);
    gl.vertexAttribPointer(0, 3, gl.FLOAT, false, 0, 0);

    gl.clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT);
    gl.drawArrays(gl.TRIANGLES, 0, 3);

    // Test several locations
    // First line should be all black
    wtu.checkCanvasRect(gl, 0, 0, 50, 1, [0, 0, 0, 0]);

    // Line 15 should be red for at least 10 red pixels starting 20 pixels in
    wtu.checkCanvasRect(gl, 20, 15, 10, 1, [255, 0, 0, 255]);

    // Last line should be all black
    wtu.checkCanvasRect(gl, 0, 49, 50, 1, [0, 0, 0, 0]);
}

init();
var successfullyParsed = true;
</script>
<script src="../../js/js-test-post.js"></script>

</body>
</html>
