gl-min-attribs.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

found in the LICENSE.txt file.

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<!DOCTYPE html>

<html>

<head>

<meta charset="utf-8">

<title>WebGL the minimum number of attributes are supported.</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="4" height="4" style="width: 40px; height: 30px;"></canvas>

<div id="description"></div>

<div id="console"></div>

<script id="vshader" type="x-shader/x-vertex">

attribute vec4 vPosition;

attribute vec4 v0;

attribute vec4 v1;

attribute vec4 v2;

attribute vec4 v3;

attribute vec4 v4;

attribute vec4 v5;

attribute vec4 v6;

varying vec4 color;

void main()

    gl_Position = vPosition;

    color = v0 + v1 + v2 + v3 + v4 + v5 + v6;

</script>

<script id="fshader" type="x-shader/x-fragment">

precision mediump float;

varying vec4 color;

void main()

    gl_FragColor = color;

</script>

<script>

"use strict";

description(document.title);

var wtu = WebGLTestUtils;

var gl = wtu.create3DContext("example");

var program = wtu.setupTexturedQuad(gl);

var program = wtu.setupProgram(

gl,

    ['vshader', 'fshader'],

    ['vPosition', 'v0', 'v1', 'v2', 'v3', 'v4', 'v5', 'v6'],

    [0, 1, 2, 3, 4, 5, 6, 7]);

for (var ii = 0; ii < 7; ++ii) {

  var v = (ii + 1) / 28;

  var vertexObject = gl.createBuffer();

  gl.bindBuffer(gl.ARRAY_BUFFER, vertexObject);

  gl.bufferData(gl.ARRAY_BUFFER, new Float32Array([

      v, v/2, v/4, v/8,

      v, v/2, v/4, v/8,

      v, v/2, v/4, v/8,

      v, v/2, v/4, v/8,

      v, v/2, v/4, v/8,

      v, v/2, v/4, v/8]), gl.STATIC_DRAW);

  gl.enableVertexAttribArray(ii + 1);

  gl.vertexAttribPointer(ii + 1, 4, gl.FLOAT, false, 0, 0);

wtu.clearAndDrawUnitQuad(gl);

wtu.glErrorShouldBe(gl, gl.NO_ERROR, "Should be no errors from setup.");

wtu.checkCanvasRect(gl, 0, 0, gl.canvas.width, gl.canvas.height, [255, 127, 64, 32], "Should render 255,127,64,32 (+/-1)", 1);

var successfullyParsed = true;

</script>

</body>

<script src="../../js/js-test-post.js"></script>

</body>

</html>