<!--
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>WebGL drawArrays Test</title>
<link rel="stylesheet" href="../../resources/js-test-style.css"/>
<script src="../../js/desktop-gl-constants.js"></script>
<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"></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);

    function checkDrawArrays(mode, count, expect, msg) {
        gl.clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT);
        gl.drawArrays(mode, 0, count);
        wtu.glErrorShouldBe(gl, expect, msg);
    }

    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);

    checkDrawArrays(gl.TRIANGLES, 3,
                    gl.INVALID_OPERATION, "gl.DrawArrays with no buffer attached to VAO should return INVALID_OPERATION");

    gl.vertexAttribPointer(0, 3, gl.FLOAT, false, 0, 0);

    checkDrawArrays(gl.TRIANGLES, 3,
                    gl.NO_ERROR, "can call gl.DrawArrays with gl.TRIANGLES");

    checkDrawArrays(
        desktopGL['QUAD_STRIP'], 4,
        gl.INVALID_ENUM, "gl.DrawArrays with QUAD_STRIP should return INVALID_ENUM");
    checkDrawArrays(
        desktopGL['QUADS'], 4,
        gl.INVALID_ENUM, "gl.DrawArrays with QUADS should return INVALID_ENUM");
    checkDrawArrays(
        desktopGL['POLYGON'], 4,
        gl.INVALID_ENUM, "gl.DrawArrays with POLYGON should return INVALID_ENUM");
}

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

</body>
</html>
