glsl-built-ins.html

Enable keyboard shortcuts

<!--

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.

-->

<!DOCTYPE html>

<html>

<head>

<meta charset="utf-8">

<title>WebGL GLSL built in variables Conformance Test</title>

<link rel="stylesheet" href="../../../resources/js-test-style.css"/>

<link rel="stylesheet" href="../../../resources/glsl-feature-tests.css"/>

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

<script src="../../../js/webgl-test-utils.js"></script>

</head>

<body>

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

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

<canvas id="example" width="2" height="2"> </canvas>

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

attribute vec4 a_position;

void main()

    gl_Position = a_position;

</script>

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

attribute vec4 a_position;

varying vec4 v_color;

void main()

    gl_Position = a_position;

    v_color = (gl_$(name) == $(max)) ? vec4(0,1,0,1) : vec4(1,0,0,1);

</script>

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

precision mediump float;

varying vec4 v_color;

void main()

    gl_FragColor = v_color;

</script>

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

precision mediump float;

void main()

    gl_FragColor = (gl_$(name) == $(max)) ? vec4(0,1,0,1) : vec4(1,0,0,1);

</script>

<script>

"use strict";

description();

var wtu = WebGLTestUtils;

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

var contextVersion = wtu.getDefault3DContextVersion();

var variables = [

  { name: 'MaxVertexAttribs',             min:   8, },

  { name: 'MaxVertexUniformVectors',      min: 128, },

  { name: 'MaxVaryingVectors',            min:   8, },

  { name: 'MaxVertexTextureImageUnits',   min:   0, },

  { name: 'MaxCombinedTextureImageUnits', min:   8, },

  { name: 'MaxTextureImageUnits',         min:   8, },

  { name: 'MaxFragmentUniformVectors',    min:  16, },

];

if (contextVersion <= 1) {

  variables.push({ name: 'MaxDrawBuffers', min: 1, max: 1});

} else {

  variables.push({ name: 'MaxDrawBuffers', min: 1, });

var toUnderscore = function(str) {

  return str.replace(/([a-z])([A-Z])/g, function (g) { return g[0] + "_" + g[1].toUpperCase() }).toUpperCase();

};

var shaderPairs = [

   [wtu.getScript("vshader"), wtu.getScript("fshaderCheck")],

   [wtu.getScript("vshaderCheck"), wtu.getScript("fshader")],

];

wtu.setupUnitQuad(gl);

variables.forEach(function(variable) {

  debug("");

  debug("Testing gl_" + variable.name);

  if (!variable.max) {

    variable.max = gl.getParameter(gl[toUnderscore(variable.name)]);

    expectTrue(variable.max >= variable.min, "gl.getParameter(gl." + toUnderscore(variable.name) + ") >= " + variable.min);

  shaderPairs.forEach(function(pair) {

    var shaders = [wtu.replaceParams(pair[0], variable), wtu.replaceParams(pair[1], variable)];

    var program = wtu.setupProgram(gl, shaders, ["a_position"], undefined, true);

    wtu.clearAndDrawUnitQuad(gl);

    wtu.checkCanvas(gl, [0, 255, 0, 255], "should be green");

});

});

var successfullyParsed = true;

</script>

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

</body>

</html>