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gl-drawarrays.html (2382B)

      1 <!--
      2 Copyright (c) 2019 The Khronos Group Inc.
      3 Use of this source code is governed by an MIT-style license that can be
      4 found in the LICENSE.txt file.
      5 -->
      6 
      7 <!DOCTYPE html>
      8 <html>
      9 <head>
     10 <meta charset="utf-8">
     11 <title>WebGL drawArrays Test</title>
     12 <link rel="stylesheet" href="../../resources/js-test-style.css"/>
     13 <script src="../../js/desktop-gl-constants.js"></script>
     14 <script src="../../js/js-test-pre.js"></script>
     15 <script src="../../js/webgl-test-utils.js"> </script>
     16 </head>
     17 <body>
     18 <canvas id="example" width="50" height="50"></canvas>
     19 <div id="description"></div>
     20 <div id="console"></div>
     21 <script id="vshader" type="x-shader/x-vertex">
     22 attribute vec4 vPosition;
     23 void main()
     24 {
     25    gl_Position = vPosition;
     26 }
     27 </script>
     28 
     29 <script id="fshader" type="x-shader/x-fragment">
     30 void main()
     31 {
     32    gl_FragColor = vec4(1.0,0.0,0.0,1.0);
     33 }
     34 </script>
     35 
     36 <script>
     37 "use strict";
     38 function init()
     39 {
     40    description(document.title);
     41 
     42    function checkDrawArrays(mode, count, expect, msg) {
     43        gl.clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT);
     44        gl.drawArrays(mode, 0, count);
     45        wtu.glErrorShouldBe(gl, expect, msg);
     46    }
     47 
     48    var wtu = WebGLTestUtils;
     49    var gl = wtu.create3DContext("example");
     50    var program = wtu.setupProgram(gl, ["vshader", "fshader"], ["vPosition"]);
     51 
     52    var vertexObject = gl.createBuffer();
     53    gl.bindBuffer(gl.ARRAY_BUFFER, vertexObject);
     54    gl.bufferData(gl.ARRAY_BUFFER, new Float32Array([ 0,0.5,0, -0.5,-0.5,0, 0.5,-0.5,0 ]), gl.STATIC_DRAW);
     55    gl.enableVertexAttribArray(0);
     56 
     57    checkDrawArrays(gl.TRIANGLES, 3,
     58                    gl.INVALID_OPERATION, "gl.DrawArrays with no buffer attached to VAO should return INVALID_OPERATION");
     59 
     60    gl.vertexAttribPointer(0, 3, gl.FLOAT, false, 0, 0);
     61 
     62    checkDrawArrays(gl.TRIANGLES, 3,
     63                    gl.NO_ERROR, "can call gl.DrawArrays with gl.TRIANGLES");
     64 
     65    checkDrawArrays(
     66        desktopGL['QUAD_STRIP'], 4,
     67        gl.INVALID_ENUM, "gl.DrawArrays with QUAD_STRIP should return INVALID_ENUM");
     68    checkDrawArrays(
     69        desktopGL['QUADS'], 4,
     70        gl.INVALID_ENUM, "gl.DrawArrays with QUADS should return INVALID_ENUM");
     71    checkDrawArrays(
     72        desktopGL['POLYGON'], 4,
     73        gl.INVALID_ENUM, "gl.DrawArrays with POLYGON should return INVALID_ENUM");
     74 }
     75 
     76 init();
     77 var successfullyParsed = true;
     78 </script>
     79 <script src="../../js/js-test-post.js"></script>
     80 
     81 </body>
     82 </html>