no-attribute-vertex-shader.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

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<!DOCTYPE html>

<html>

<head>

<meta charset="utf-8">

<title>Test no attribute vertex shaders</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>

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

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

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

void main() {

  ivec2 xy = ivec2(

      gl_VertexID % 2,

      (gl_VertexID / 2 + gl_VertexID / 3) % 2);

  gl_Position = vec4(vec2(xy) * 2. - 1., 0, 1);

</script>

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

precision mediump float;

out vec4 result;

void main() {

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

</script>

<script>

"use strict";

description("Test no attribute shaders work as expected");

var wtu = WebGLTestUtils;

var gl = wtu.create3DContext(undefined, undefined, 2);

function test() {

    debug("");

    var program = wtu.setupProgram(gl, ["vertex-shader", "fshader"], undefined, undefined, true);

    if (!program) {

        testFailed('Program compilation failed');

        return;

    gl.drawArrays(gl.TRIANGLES, 0, 6);

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

};

if (!gl) {

    testFailed("context does not exist");

} else {

    test();

var successfullyParsed = true;

finishTest();

</script>

</body>

</html>