test_depth_tex_lazy_clear.html

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<!DOCTYPE HTML>

<html>

<head>

  <meta charset='utf-8'/>

  <script src='/tests/SimpleTest/SimpleTest.js'></script>

  <link rel='stylesheet' href='/tests/SimpleTest/test.css'>

  <script src='webgl-util.js'></script>

</head>

<body>

<script id='vs' type='x-shader/x-vertex'>

attribute vec2 aVertCoord;

void main(void) {

  gl_Position = vec4(aVertCoord, 0.0, 1.0);

</script>

<script id='fs' type='x-shader/x-fragment'>

precision mediump float;

uniform sampler2D uTexUnit;

void main(void) {

  vec4 tex = texture2D(uTexUnit, vec2(0));

  gl_FragColor = vec4(tex.r, 1.0, 0.0, 1.0);

</script>

<script>

'use strict';

var gl = null;

do {

  var c = document.createElement('canvas');

  gl = c.getContext('webgl');

  if (!gl) {

    todo(false, 'Get GL working here first.');

    break;

  var ext = gl.getExtension('WEBGL_depth_texture');

  if (!ext) {

    todo(false, 'WEBGL_depth_texture not supported, which is fine.');

    break;

  var prog = WebGLUtil.createProgramByIds(gl, 'vs', 'fs');

  if (!prog) {

    ok(false, 'Program linking should succeed.');

    break;

  var tex = gl.createTexture();

  gl.bindTexture(gl.TEXTURE_2D, tex);

  gl.texImage2D(gl.TEXTURE_2D, 0, gl.DEPTH_COMPONENT, 1, 1, 0, gl.DEPTH_COMPONENT,

                gl.UNSIGNED_INT, null);

  var uTexUnit = gl.getUniformLocation(prog, 'uTexUnit');

  gl.useProgram(prog);

  gl.uniform1i(uTexUnit, 0);

  gl.drawArrays(gl.POINTS, 0, 1);

  ok(!gl.getError(), 'Should have no errors.');

} while (false);

ok(true, 'Test complete.');

</script>

</body>

</html>