dom/canvas/test/webgl-mochitest/test_highp_fs.html

   1 <!DOCTYPE HTML>
   2 <title>WebGL test: `highp` support</title>
   3 <script src="/tests/SimpleTest/SimpleTest.js"></script>
   4 <link rel="stylesheet" href="/tests/SimpleTest/test.css">
   5 <script src="driver-info.js"></script>
   6 <script src="webgl-util.js"></script>
   7 <script id="shader-vs" type="x-shader/x-vertex">
   8
   9 void main(void) {
  10   gl_Position = vec4(vec3(0.0), 1.0);
  11 }
  12
  13 </script>
  14 <script id="shader-fs" type="x-shader/x-fragment">
  15
  16 precision highp float;
  17
  18 void main(void) {
  19   gl_FragColor = vec4(1.0, 1.0, 1.0, 1.0);
  20 }
  21
  22 </script>
  23 <body>
  24 <canvas id="c"></canvas>
  25 <script>
  26
  27 // Give ourselves a scope to return early from:
  28 (function() {
  29   var gl = c.getContext('webgl');
  30   if (!gl) {
  31     todo(false, 'WebGL is unavailable.');
  32     return;
  33   }
  34
  35   function checkGLError(func, info) {
  36     var error = gl.getError();
  37     var prefix = info ? ('[' + info + '] ') : ''
  38     func(!error, prefix + 'gl.getError should be 0x0, was 0x' + error.toString(16) + '.');
  39   }
  40
  41   var format = gl.getShaderPrecisionFormat(gl.FRAGMENT_SHADER, gl.HIGH_FLOAT);
  42   var prog = WebGLUtil.createProgramByIds(gl, 'shader-vs', 'shader-fs');
  43   checkGLError(ok);
  44
  45   if (format) {
  46     ok(prog, 'Frag shader with unconditional `precision highp float` should ' +
  47              'link if `getShaderPrecisionFormat` gives a format for it.');
  48   } else {
  49     ok(!prog, 'Frag shader with unconditional `precision highp float` should ' +
  50               'NOT link if `getShaderPrecisionFormat` gives NO format for it.');
  51   }
  52 })();
  53
  54 </script>
  55