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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
found in the LICENSE.txt file.
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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>WebGL2 texture base level bug conformance test.</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 src="../../../js/tests/tex-image-and-sub-image-utils.js"></script>
</head>
<body>
<canvas id="example" width="2" height="2" style="width: 2px; height: 2px;"></canvas>
<div id="description"></div>
<div id="console"></div>

<script>
"use strict";
description(document.title);
var wtu = WebGLTestUtils;
var canvas = document.getElementById("example");
var gl = wtu.create3DContext("example", undefined, 2);
var tiu = TexImageUtils;

wtu.glErrorShouldBe(gl, gl.NO_ERROR, "Should be no errors from setup.");

function runtest() {
  debug("");
  debug("This is a regression test for <a href='https://crbug.com/705865'>Chromium Issue 705865</a>");
  var tex = gl.createTexture();
  var program = tiu.setupTexturedQuad(gl, "RGBA");

  // Test that filling partial levels is enough for mipmapping.
  var width = 2;
  var height = 2;
  gl.bindTexture(gl.TEXTURE_2D, tex);
  wtu.fillTexture(gl, tex, width, height, [255, 0, 0, 255], 2, gl.RGBA, gl.UNSIGNED_BYTE);
  gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_BASE_LEVEL, 2);
  gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.NEAREST);
  gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.NEAREST);
  wtu.glErrorShouldBe(gl, gl.NO_ERROR, "Texture setup should succeed");

  canvas.width = width;
  canvas.height = height;
  gl.viewport(0, 0, width, height);

  wtu.clearAndDrawUnitQuad(gl);
  wtu.glErrorShouldBe(gl, gl.NO_ERROR, "clearAndDrawQuad should succeed");
  wtu.checkCanvas(gl, [255, 0, 0, 255], "should draw with [255, 0, 0, 255]");

  width = 1;
  height = 1;
  gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, width, height, 0, gl.RGBA, gl.UNSIGNED_BYTE, null);
  wtu.glErrorShouldBe(gl, gl.NO_ERROR, "texImage2D should succeed");

  wtu.clearAndDrawUnitQuad(gl);
  wtu.checkCanvas(gl, [255, 0, 0, 255], "should draw with [255, 0, 0, 255]");
  wtu.glErrorShouldBe(gl, gl.NO_ERROR,"checkCanvas should succeed");

  gl.deleteTexture(tex);

};

runtest();
var successfullyParsed = true;

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

</body>
</html>
