<!--
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>Sketchfab Lighting Shader Crash</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>
<script id='vshader1' type='x-shader/x-vertex'>
attribute float testValue;          // Can be uniform as well.
varying mediump float FragVarying;  // Necessary to reproduce.

void main() {
  // Crashes with mat4 as well. Does not crash with vectors.
  mat2 projectionMatrix = mat2(0.0, 0.0, 0.0, 0.0);
  if (testValue == 1.0)
  {
    // Using the matrix variable appears necessary.
    projectionMatrix[0][0] = 1.0;
  }

  FragVarying = 0.0;
  // Referencing the matrix is necessary though clearly the compiler
  // doesn't realize the assignment is useless.
  gl_Position = vec4(projectionMatrix[1][0], 0.0, 0.0, 1.0);
}
</script>
<script id='fshader1' type='x-shader/x-fragment'>
precision mediump float;
varying float FragVarying;

void main() {
  gl_FragColor = vec4(FragVarying, 0.0, 0.0, 1.0);
}
</script>
</head>
<body>
<div id="description"></div>
<div id="console"></div>
<script>
"use strict";
description("This test demonstrates a crash on the Nexus 5 (Adreno 330) when compiling Sketchfab's lighting shader. <a href='https://code.google.com/p/chromium/issues/detail?id=551937'>crbug.com/551937</a>");

debug("");

var wtu = WebGLTestUtils;
var gl = wtu.create3DContext();

gl.canvas.addEventListener("webglcontextlost", function(e) {
   testFailed("WebGL context lost");
});

if (!gl) {
    testFailed("WebGL context does not exist");
} else {
    testPassed("WebGL context exists");
    debug("");

    var program1 = wtu.setupProgram(gl, ['vshader1', 'fshader1']);
    if (!gl.getProgramParameter(program1, gl.LINK_STATUS)) {
        testFailed("Program failed to link");
    } else {
        testPassed("Program linked successfully");
    }
    wtu.glErrorShouldBe(gl, gl.NO_ERROR, "there should be no errors");

    debug("");
}

// Cycle through rAF a few times to give any webglcontextlost events a chance to propagate.
wtu.waitForComposite(function() { finishTest(); });

debug("");
var successfullyParsed = true;
</script>

</body>
</html>
