<!--
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>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>
