active-built-in-attribs.html

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Copyright (c) 2019 The Khronos Group Inc.

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<head>

<meta charset="utf-8">

<title>WebGL Conformance Tests: Verify validation for active built-in attribs</title>

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

<script src="../../js/desktop-gl-constants.js"></script>

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

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

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

<canvas id="canvas" style="width: 64px; height: 64px;"> </canvas>

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

<script id="vs" type="x-shader/x-vertex">#version 300 es

void main() {

  gl_Position = vec4(gl_VertexID % 2, (gl_VertexID/2) % 2, 0, 1);

</script>

<script id="fs" type="x-shader/x-fragment">#version 300 es

precision mediump float;

out vec4 fragColor;

void main() {

  fragColor = vec4(0, 1, 0, 1);

</script>

<script>

"use strict";

description("This test verifies validation for active built-in attribs.");

debug("");

var wtu = WebGLTestUtils;

var canvas = document.getElementById("canvas");

var gl = wtu.create3DContext(canvas, null, 2);

if (!gl) {

  testFailed("WebGL context does not exist");

} else {

  testPassed("WebGL context exists");

  runTests();

var activeInfo, attribLoc;

function runTests() {

  var prog = wtu.setupProgram(gl, ["vs", "fs"]);

  if (!prog) {

    testFailed("Set up program failed");

    return;

  wtu.glErrorShouldBe(gl, gl.NO_ERROR, "No GL error from set up");

  var numActive = gl.getProgramParameter(prog, gl.ACTIVE_ATTRIBUTES);

  if (numActive != 1) {

    testFailed('ACTIVE_ATTRIBUTES should be 1.');

    return;

  testPassed('ACTIVE_ATTRIBUTES should be 1.');

  activeInfo = gl.getActiveAttrib(prog, 0);

  if (!activeInfo) {

    testFailed('getActiveAttrib should return an info object.');

    return;

  shouldBe('activeInfo.name', '"gl_VertexID"');

  attribLoc = gl.getAttribLocation(prog, 'gl_VertexID');

  wtu.glErrorShouldBe(gl, gl.NO_ERROR, "Should be able to request the location of a built-in.");

  shouldBe('attribLoc', '-1');

var successfullyParsed = true;

</script>

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