gl-drawarrays.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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<!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>