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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>WebGL2 texture unpack parameters with FLIP_Y / PREMULTIPLY_ALPHA 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>
</head>
<body>
<canvas id="example" width="4" height="4"></canvas>
<div id="description"></div>
<div id="console"></div>
<script>
"use strict";

var wtu = WebGLTestUtils;
var __verbose__ = false;

// Some drivers (for example, NVIDIA Linux) incorrectly require padding for
// the last row. The below flag is only for testing convenience. Browsers should
// work around the bug.
var __apply_alignment_workaround__ = false;

function setupArrayBuffer(size, initData) {
  var array = new Uint8Array(size);
  if (initData) {
    for (var ii = 0; ii < size; ++ii) {
      array[ii] = ii % 255;
    }
  }
  return array;
}

function calculatePaddingBytes(bytesPerPixel, alignment, width) {
  var padding = 0;
  switch (alignment) {
    case 1:
    case 2:
    case 4:
    case 8:
      padding = (bytesPerPixel * width) % alignment;
      if (padding > 0)
        padding = alignment - padding;
      return padding;
    default:
      testFailed("should not reach here");
      return;
  }
}

function computeImageSizes2D(width, height, testCase) {
  // Assume RGBA8/UNSIGNED_BYTE
  var bytesPerPixel = 4;
  var actualWidth = testCase.rowLength == 0 ? width : testCase.rowLength;
  var padding = calculatePaddingBytes(bytesPerPixel, testCase.alignment, actualWidth);
  var bytesPerRow = actualWidth * bytesPerPixel + padding;
  var bytesLastRow = bytesPerPixel * width;
  var size = bytesPerRow * (height - 1) + bytesLastRow;
  var skipSize = 0;
  if (testCase.skipPixels > 0)
    skipSize += bytesPerPixel * testCase.skipPixels;
  if (testCase.skipRows > 0)
    skipSize += bytesPerRow * testCase.skipRows;
  return {size: size,
          bytesPerRow: bytesPerRow,
          bytesLastRow: bytesLastRow,
          padding: padding,
          skipSize: skipSize,
          totalSize: size + skipSize};
}

function copyData(srcData, srcIndex, dstData, dstIndex, size, premultiply_alpha) {
  for (var ii = 0; ii < size / 4; ++ii) {
    var factor = 1.0;
    if (premultiply_alpha)
      factor = srcData[srcIndex + ii * 4 + 3] / 255.0;
    dstData[dstIndex + ii * 4] = srcData[srcIndex + ii * 4] * factor;
    dstData[dstIndex + ii * 4 + 1] = srcData[srcIndex + ii * 4 + 1] * factor;
    dstData[dstIndex + ii * 4 + 2] = srcData[srcIndex + ii * 4 + 2] * factor;
    dstData[dstIndex + ii * 4 + 3] = srcData[srcIndex + ii * 4 + 3];
  }
}

function unpackPixels(srcData, width, height, imageSizes, flip_y, premultiply_alpha) {
  var bytesPerPixel = 4;
  var unpackedSize = width * height * bytesPerPixel;
  var dstData = setupArrayBuffer(unpackedSize, false);
  var srcIndex = imageSizes.skipSize;
  var dstIndex = 0;
  var inc = width * bytesPerPixel;
  if (flip_y)
    dstIndex += (height - 1) * inc;
  for (var y = 0; y < height; ++y) {
    copyData(srcData, srcIndex, dstData, dstIndex, width * bytesPerPixel, premultiply_alpha);
    srcIndex += imageSizes.bytesPerRow;
    if (flip_y)
      dstIndex -= inc;
    else
      dstIndex += inc;
  }
  if (flip_y)
    dstIndex += height * inc;
  return dstData;
}

function getPixelsFromTexture2D(gl, tex, xoffset, yoffset, width, height) {
  var fbo = gl.createFramebuffer();
  gl.bindFramebuffer(gl.FRAMEBUFFER, fbo);
  gl.framebufferTexture2D(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.TEXTURE_2D, tex, 0);
  var bytesPerReadbackPixel = 4;
  var readbackBuffer = setupArrayBuffer(width * height * bytesPerReadbackPixel, false);
  gl.readPixels(xoffset, yoffset, width, height, gl.RGBA, gl.UNSIGNED_BYTE, readbackBuffer);
  wtu.glErrorShouldBe(gl, gl.NO_ERROR, "read back texture pixels should succeed");
  gl.bindFramebuffer(gl.FRAMEBUFFER, null);
  gl.deleteFramebuffer(fbo);
  return readbackBuffer;
}

function comparePixels(buffer1, buffer2, tolerance) {
  if (buffer1.length != buffer2.length || buffer1.length % 4 != 0) {
    testFailed("compare pixels: invalid buffer size");
    return;
  }
  var count = 0;
  for (var ii = 0; ii < buffer1.length / 4; ++ii) {
    var distance = 0;
    for (var jj = 0; jj < 4; ++jj) {
      var diff = buffer1[ii * 4 + jj] - buffer2[ii * 4 + jj];
      distance += diff * diff;
    }
    if (Math.sqrt(diff) > tolerance) {
      if (__verbose__) {
        debug("Pixel " + ii + ": expected (" +
              [buffer1[ii * 4], buffer1[ii * 4 + 1], buffer1[ii * 4 + 2], buffer1[ii * 4 + 3]] + "), got (" +
              [buffer2[ii * 4], buffer2[ii * 4 + 1], buffer2[ii * 4 + 2], buffer2[ii * 4 + 3]] + ")");
      }
      count++;
    }
  }
  if (count > 0) {
    testFailed("compare pixels: " + count + " pixels differ");
  } else {
    testPassed("compare pixels: as expected");
  }
}

function runTestIteration2D(gl, testCase, flip_y, premultiply_alpha) {
  debug("");
  debug("Texture upload with : flip_y = " + flip_y + ", premultiply_alpha = " + premultiply_alpha +
        ", alignment = " + testCase.alignment + ", rowLength = " + testCase.rowLength +
        ", skipPixels = " + testCase.skipPixels + ", skipRows = " + testCase.skipRows);
  debug("TexImage2D : size = (" + testCase.width + ", " + testCase.height + ")");
  gl.pixelStorei(gl.UNPACK_ALIGNMENT, testCase.alignment);
  gl.pixelStorei(gl.UNPACK_ROW_LENGTH, testCase.rowLength);
  gl.pixelStorei(gl.UNPACK_SKIP_PIXELS, testCase.skipPixels);
  gl.pixelStorei(gl.UNPACK_SKIP_ROWS, testCase.skipRows);
  gl.pixelStorei(gl.UNPACK_FLIP_Y_WEBGL, flip_y);
  gl.pixelStorei(gl.UNPACK_PREMULTIPLY_ALPHA_WEBGL, premultiply_alpha);
  wtu.glErrorShouldBe(gl, gl.NO_ERROR, "Set up pixel store parameters should succeed");

  var tol = 3;

  var tex = gl.createTexture();
  gl.bindTexture(gl.TEXTURE_2D, tex);

  var imageSizes = computeImageSizes2D(testCase.width, testCase.height, testCase);
  var bufferSize = imageSizes.totalSize;
  var array;

  // Verify buffer with less than enough size will fail.
  array = setupArrayBuffer(bufferSize - 1, false);
  gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA8, testCase.width, testCase.height, 0,
                gl.RGBA, gl.UNSIGNED_BYTE, array);
  wtu.glErrorShouldBe(gl, gl.INVALID_OPERATION, "buffer too small");

  if (__apply_alignment_workaround__)
    bufferSize += imageSizes.padding;
  array = setupArrayBuffer(bufferSize, true);
  gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA8, testCase.width, testCase.height, 0,
                gl.RGBA, gl.UNSIGNED_BYTE, array);
  if (testCase.validUnpackParams2D) {
    wtu.glErrorShouldBe(gl, gl.NO_ERROR, "texImage2D with correct buffer size should succeed");
  } else {
    wtu.glErrorShouldBe(gl, gl.INVALID_OPERATION, "invalid unpack params combination");
    gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA8, testCase.width, testCase.height, 0,
                  gl.RGBA, gl.UNSIGNED_BYTE, null);
    wtu.glErrorShouldBe(gl, gl.NO_ERROR, "unpack param constraints do not apply if no data are uploaded.");
    return;
  }

  var buffer1 = unpackPixels(array, testCase.width, testCase.height, imageSizes, flip_y, premultiply_alpha);
  var buffer2 = getPixelsFromTexture2D(gl, tex, 0, 0, testCase.width, testCase.height);
  comparePixels(buffer1, buffer2, tol);

  var subWidth = testCase.width - testCase.xoffset;
  var subHeight = testCase.height - testCase.yoffset;
  debug("TexSubImage2D : offset = (" + testCase.xoffset + ", " + testCase.yoffset +
        "), size = (" + subWidth + ", " + subHeight + ")");
  imageSizes = computeImageSizes2D(subWidth, subHeight, testCase);
  bufferSize = imageSizes.totalSize;

  array = setupArrayBuffer(bufferSize - 1, false);
  gl.texSubImage2D(gl.TEXTURE_2D, 0, testCase.xoffset, testCase.yoffset,
                   subWidth, subHeight, gl.RGBA, gl.UNSIGNED_BYTE, array);
  wtu.glErrorShouldBe(gl, gl.INVALID_OPERATION, "buffer too small");

  if (__apply_alignment_workaround__)
    bufferSize += imageSizes.padding;
  array = setupArrayBuffer(bufferSize, true);
  gl.texSubImage2D(gl.TEXTURE_2D, 0, testCase.xoffset, testCase.yoffset, subWidth, subHeight,
                   gl.RGBA, gl.UNSIGNED_BYTE, array);
  if (testCase.validUnpackParamsForSub2D) {
    wtu.glErrorShouldBe(gl, gl.NO_ERROR, "texSubImage2D with correct buffer size should succeed");
  } else {
    wtu.glErrorShouldBe(gl, gl.INVALID_OPERATION, "invalid unpack params combination");
    return;
  }

  var buffer1 = unpackPixels(array, subWidth, subHeight, imageSizes, flip_y, premultiply_alpha);
  var buffer2 = getPixelsFromTexture2D(
      gl, tex, testCase.xoffset, testCase.yoffset, subWidth, subHeight);
  comparePixels(buffer1, buffer2, tol);

  gl.bindTexture(gl.TEXTURE_2D, null);
  gl.deleteTexture(tex);
  wtu.glErrorShouldBe(gl, gl.NO_ERROR, "no error");
}

function runTests(gl) {
  var testCases = [
    { width: 5, height: 7, xoffset: 2, yoffset: 3,
      alignment: 1, rowLength: 0, skipPixels: 0, skipRows: 0,
      validUnpackParams2D: true, validUnpackParamsForSub2D: true },
    { width: 5, height: 7, xoffset: 2, yoffset: 3,
      alignment: 2, rowLength: 0, skipPixels: 0, skipRows: 0,
      validUnpackParams2D: true, validUnpackParamsForSub2D: true },
    { width: 6, height: 7, xoffset: 2, yoffset: 3,
      alignment: 4, rowLength: 0, skipPixels: 0, skipRows: 0,
      validUnpackParams2D: true, validUnpackParamsForSub2D: true },
    { width: 5, height: 8, xoffset: 2, yoffset: 3,
      alignment: 8, rowLength: 0, skipPixels: 0, skipRows: 0,
      validUnpackParams2D: true, validUnpackParamsForSub2D: true },

    // ROW_LENGTH == width
    { width: 10, height: 9, xoffset: 2, yoffset: 3,
      alignment: 4, rowLength: 10, skipPixels: 0, skipRows: 0,
      validUnpackParams2D: true, validUnpackParamsForSub2D: true },

    // ROW_LENGTH < width
    { width: 5, height: 7, xoffset: 2, yoffset: 3,
      alignment: 1, rowLength: 4, skipPixels: 0, skipRows: 0,
      validUnpackParams2D: false },
    { width: 5, height: 7, xoffset: 2, yoffset: 3,
      alignment: 2, rowLength: 4, skipPixels: 0, skipRows: 0,
      validUnpackParams2D: false },
    { width: 5, height: 7, xoffset: 2, yoffset: 3,
      alignment: 4, rowLength: 4, skipPixels: 0, skipRows: 0,
      validUnpackParams2D: false },
    { width: 5, height: 7, xoffset: 2, yoffset: 3,
      alignment: 8, rowLength: 4, skipPixels: 0, skipRows: 0,
      validUnpackParams2D: false },

    // ROW_LENGTH > width
    { width: 5, height: 7, xoffset: 2, yoffset: 3,
      alignment: 1, rowLength: 6, skipPixels: 0, skipRows: 0,
      validUnpackParams2D: true, validUnpackParamsForSub2D: true },
    { width: 5, height: 7, xoffset: 2, yoffset: 3,
      alignment: 2, rowLength: 7, skipPixels: 0, skipRows: 0,
      validUnpackParams2D: true, validUnpackParamsForSub2D: true },
    { width: 5, height: 7, xoffset: 2, yoffset: 3,
      alignment: 4, rowLength: 8, skipPixels: 0, skipRows: 0,
      validUnpackParams2D: true, validUnpackParamsForSub2D: true },
    { width: 5, height: 7, xoffset: 2, yoffset: 3,
      alignment: 8, rowLength: 9, skipPixels: 0, skipRows: 0,
      validUnpackParams2D: true, validUnpackParamsForSub2D: true },

    // IMAGE_HEIGHT == height
    { width: 6, height: 7, xoffset: 2, yoffset: 3,
      alignment: 8, rowLength: 0, skipPixels: 0, skipRows: 0,
      validUnpackParams2D: true, validUnpackParamsForSub2D: true },

    // IMAGE_HEIGHT < height
    { width: 5, height: 7, xoffset: 2, yoffset: 3,
      alignment: 1, rowLength: 0, skipPixels: 0, skipRows: 0,
      validUnpackParams2D: true, validUnpackParamsForSub2D: true },
    { width: 5, height: 7, xoffset: 2, yoffset: 3,
      alignment: 2, rowLength: 0, skipPixels: 0, skipRows: 0,
      validUnpackParams2D: true, validUnpackParamsForSub2D: true },
    { width: 5, height: 7, xoffset: 2, yoffset: 3,
      alignment: 4, rowLength: 0, skipPixels: 0, skipRows: 0,
      validUnpackParams2D: true, validUnpackParamsForSub2D: true },
    { width: 5, height: 7, xoffset: 2, yoffset: 3,
      alignment: 8, rowLength: 0, skipPixels: 0, skipRows: 0,
      validUnpackParams2D: true, validUnpackParamsForSub2D: true },

    // IMAGE_HEIGHT > height
    { width: 5, height: 7, xoffset: 2, yoffset: 3,
      alignment: 1, rowLength: 0, skipPixels: 0, skipRows: 0,
      validUnpackParams2D: true, validUnpackParamsForSub2D: true },
    { width: 6, height: 7, xoffset: 2, yoffset: 2,
      alignment: 2, rowLength: 0, skipPixels: 0, skipRows: 0,
      validUnpackParams2D: true, validUnpackParamsForSub2D: true },
    { width: 7, height: 7, xoffset: 2, yoffset: 4,
      alignment: 4, rowLength: 0, skipPixels: 0, skipRows: 0,
      validUnpackParams2D: true, validUnpackParamsForSub2D: true },
    { width: 8, height: 7, xoffset: 2, yoffset: 3,
      alignment: 8, rowLength: 0, skipPixels: 0, skipRows: 0,
      validUnpackParams2D: true, validUnpackParamsForSub2D: true },

    // SKIP parameters
    { width: 5, height: 7, xoffset: 2, yoffset: 3,
      alignment: 1, rowLength: 0, skipPixels: 10, skipRows: 0,
      validUnpackParams2D: false },
    { width: 5, height: 7, xoffset: 2, yoffset: 3,
      alignment: 2, rowLength: 0, skipPixels: 2, skipRows: 8,
      validUnpackParams2D: false },
    { width: 5, height: 7, xoffset: 2, yoffset: 3,
      alignment: 4, rowLength: 0, skipPixels: 3, skipRows: 5,
      validUnpackParams2D: false },
    { width: 5, height: 7, xoffset: 2, yoffset: 3,
      alignment: 8, rowLength: 0, skipPixels: 7, skipRows: 0,
      validUnpackParams2D: false },

    // all mixed.
    { width: 5, height: 7, xoffset: 2, yoffset: 3,
      alignment: 1, rowLength: 6, skipPixels: 3, skipRows: 5,
      validUnpackParams2D: false },
    { width: 5, height: 7, xoffset: 2, yoffset: 3,
      alignment: 2, rowLength: 4, skipPixels: 7, skipRows: 2,
      validUnpackParams2D: false },
    { width: 5, height: 7, xoffset: 2, yoffset: 3,
      alignment: 4, rowLength: 10, skipPixels: 0, skipRows: 3,
      validUnpackParams2D: true, validUnpackParamsForSub2D: true },
    { width: 1, height: 1, xoffset: 0, yoffset: 0,
      alignment: 2, rowLength: 3, skipPixels: 3, skipRows: 5,
      validUnpackParams2D: false },
    { width: 17, height: 6, xoffset: 12, yoffset: 3,
      alignment: 2, rowLength: 4, skipPixels: 1, skipRows: 4,
      validUnpackParams2D: false },
    { width: 8, height: 17, xoffset: 2, yoffset: 13,
      alignment: 4, rowLength: 9, skipPixels: 0, skipRows: 3,
      validUnpackParams2D: true, validUnpackParamsForSub2D: true },
  ];

  var groups = [
    // { flip_y: false,  premultiply_alpha: false },
    { flip_y: true,  premultiply_alpha: false },
    { flip_y: false, premultiply_alpha: true },
    { flip_y: true,  premultiply_alpha: true },
  ];

  for (var jj = 0; jj < groups.length; ++jj) {
    var group = groups[jj];
    for (var ii = 0; ii < testCases.length; ++ii) {
      var testCase = testCases[ii];
      runTestIteration2D(gl, testCase, group.flip_y, group.premultiply_alpha);
    }
  }
}

function runNegativeTests(gl) {
  debug("");
  debug("Test tex{Sub}Image2D from pbo fails with FLIP_Y = true or PREMULTIPLY_ALPHA = true");

  var width = 16, height = 16, depth = 2;

  // Restore default values.
  gl.pixelStorei(gl.UNPACK_ALIGNMENT, 4);
  gl.pixelStorei(gl.UNPACK_ROW_LENGTH, 0);
  gl.pixelStorei(gl.UNPACK_IMAGE_HEIGHT, 0);
  gl.pixelStorei(gl.UNPACK_SKIP_PIXELS, 0);
  gl.pixelStorei(gl.UNPACK_SKIP_ROWS, 0);
  gl.pixelStorei(gl.UNPACK_SKIP_IMAGES, 0);
  gl.pixelStorei(gl.UNPACK_FLIP_Y_WEBGL, false);
  gl.pixelStorei(gl.UNPACK_PREMULTIPLY_ALPHA_WEBGL, false);

  var tex = gl.createTexture();
  gl.bindTexture(gl.TEXTURE_2D, tex);

  var bufferSize = width * height * 4; // RGBA8
  var buffer = gl.createBuffer();
  gl.bindBuffer(gl.PIXEL_UNPACK_BUFFER, buffer);
  gl.bufferData(gl.PIXEL_UNPACK_BUFFER, bufferSize, gl.DYNAMIC_DRAW);

  gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA8, width, height, 0, gl.RGBA, gl.UNSIGNED_BYTE, 0);
  wtu.glErrorShouldBe(gl, gl.NO_ERROR, "texImage2D from pbo works with default pixel store settings");
  gl.texSubImage2D(gl.TEXTURE_2D, 0, 0, 0, width, height, gl.RGBA, gl.UNSIGNED_BYTE, 0);
  wtu.glErrorShouldBe(gl, gl.NO_ERROR, "texSubImage2D from pbo works with default pixel store settings");

  gl.pixelStorei(gl.UNPACK_FLIP_Y_WEBGL, true);
  gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA8, width, height, 0, gl.RGBA, gl.UNSIGNED_BYTE, 0);
  wtu.glErrorShouldBe(gl, gl.INVALID_OPERATION, "texImage2D from pbo with FLIP_Y=true should fail");
  gl.texSubImage2D(gl.TEXTURE_2D, 0, 0, 0, width, height, gl.RGBA, gl.UNSIGNED_BYTE, 0);
  wtu.glErrorShouldBe(gl, gl.INVALID_OPERATION, "texSubImage2D from pbo with FLIP_Y=true should fail");
  gl.pixelStorei(gl.UNPACK_FLIP_Y_WEBGL, false);

  gl.pixelStorei(gl.UNPACK_PREMULTIPLY_ALPHA_WEBGL, true);
  gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA8, width, height, 0, gl.RGBA, gl.UNSIGNED_BYTE, 0);
  wtu.glErrorShouldBe(gl, gl.INVALID_OPERATION, "texImage2D from pbo with PREMULTIPLY_ALPHA=true should fail");
  gl.texSubImage2D(gl.TEXTURE_2D, 0, 0, 0, width, height, gl.RGBA, gl.UNSIGNED_BYTE, 0);
  wtu.glErrorShouldBe(gl, gl.INVALID_OPERATION, "texSubImage2D from pbo with PREMULTIPLY_ALPHA=true should fail");
  gl.pixelStorei(gl.UNPACK_PREMULTIPLY_ALPHA_WEBGL, false);

  debug("");
  debug("Test tex{Sub}Image3D from pbo fails with FLIP_Y = true or PREMULTIPLY_ALPHA = true");

  gl.deleteTexture(tex);
  tex = gl.createTexture();
  gl.bindTexture(gl.TEXTURE_3D, tex);

  bufferSize = width * height * depth * 4; // RGBA8
  gl.bindBuffer(gl.PIXEL_UNPACK_BUFFER, buffer);
  gl.bufferData(gl.PIXEL_UNPACK_BUFFER, bufferSize, gl.DYNAMIC_DRAW);

  gl.texImage3D(gl.TEXTURE_3D, 0, gl.RGBA8, width, height, depth, 0, gl.RGBA, gl.UNSIGNED_BYTE, 0);
  wtu.glErrorShouldBe(gl, gl.NO_ERROR, "texImage3D from pbo works with default pixel store settings");
  gl.texSubImage3D(gl.TEXTURE_3D, 0, 0, 0, 0, width, height, depth, gl.RGBA, gl.UNSIGNED_BYTE, 0);
  wtu.glErrorShouldBe(gl, gl.NO_ERROR, "texSubImage3D from pbo works with default pixel store settings");

  gl.pixelStorei(gl.UNPACK_FLIP_Y_WEBGL, true);
  gl.texImage3D(gl.TEXTURE_3D, 0, gl.RGBA8, width, height, depth, 0, gl.RGBA, gl.UNSIGNED_BYTE, 0);
  wtu.glErrorShouldBe(gl, gl.INVALID_OPERATION, "texImage3D from pbo with FLIP_Y=true should fail");
  gl.texSubImage3D(gl.TEXTURE_3D, 0, 0, 0, 0, width, height, depth, gl.RGBA, gl.UNSIGNED_BYTE, 0);
  wtu.glErrorShouldBe(gl, gl.INVALID_OPERATION, "texSubImage3D from pbo with FLIP_Y=true should fail");
  gl.pixelStorei(gl.UNPACK_FLIP_Y_WEBGL, false);

  gl.pixelStorei(gl.UNPACK_PREMULTIPLY_ALPHA_WEBGL, true);
  gl.texImage3D(gl.TEXTURE_3D, 0, gl.RGBA8, width, height, depth, 0, gl.RGBA, gl.UNSIGNED_BYTE, 0);
  wtu.glErrorShouldBe(gl, gl.INVALID_OPERATION, "texImage3D from pbo with PREMULTIPLY_ALPHA=true should fail");
  gl.texSubImage3D(gl.TEXTURE_3D, 0, 0, 0, 0, width, height, depth, gl.RGBA, gl.UNSIGNED_BYTE, 0);
  wtu.glErrorShouldBe(gl, gl.INVALID_OPERATION, "texSubImage3D from pbo with PREMULTIPLY_ALPHA=true should fail");
  gl.pixelStorei(gl.UNPACK_PREMULTIPLY_ALPHA_WEBGL, false);

  debug("");
  debug("Test tex{Sub}Image3D from client array fails with FLIP_Y = true or PREMULTIPLY_ALPHA = true");

  gl.bindBuffer(gl.PIXEL_UNPACK_BUFFER, null);
  gl.deleteBuffer(buffer);
  buffer = null;
  var array = setupArrayBuffer(bufferSize, false);

  gl.texImage3D(gl.TEXTURE_3D, 0, gl.RGBA8, width, height, depth, 0, gl.RGBA, gl.UNSIGNED_BYTE, array);
  wtu.glErrorShouldBe(gl, gl.NO_ERROR, "texImage3D from client array works with default pixel store settings");
  gl.texSubImage3D(gl.TEXTURE_3D, 0, 0, 0, 0, width, height, depth, gl.RGBA, gl.UNSIGNED_BYTE, array);
  wtu.glErrorShouldBe(gl, gl.NO_ERROR, "texSubImage3D from client array works with default pixel store settings");

  gl.pixelStorei(gl.UNPACK_FLIP_Y_WEBGL, true);
  gl.texImage3D(gl.TEXTURE_3D, 0, gl.RGBA8, width, height, depth, 0, gl.RGBA, gl.UNSIGNED_BYTE, array);
  wtu.glErrorShouldBe(gl, gl.INVALID_OPERATION, "texImage3D from client array with FLIP_Y=true should fail");
  gl.texSubImage3D(gl.TEXTURE_3D, 0, 0, 0, 0, width, height, depth, gl.RGBA, gl.UNSIGNED_BYTE, array);
  wtu.glErrorShouldBe(gl, gl.INVALID_OPERATION, "texSubImage3D from client array with FLIP_Y=true should fail");
  gl.pixelStorei(gl.UNPACK_FLIP_Y_WEBGL, false);

  gl.pixelStorei(gl.UNPACK_PREMULTIPLY_ALPHA_WEBGL, true);
  gl.texImage3D(gl.TEXTURE_3D, 0, gl.RGBA8, width, height, depth, 0, gl.RGBA, gl.UNSIGNED_BYTE, array);
  wtu.glErrorShouldBe(gl, gl.INVALID_OPERATION, "texImage3D from pbo with PREMULTIPLY_ALPHA=true should fail");
  gl.texSubImage3D(gl.TEXTURE_3D, 0, 0, 0, 0, width, height, depth, gl.RGBA, gl.UNSIGNED_BYTE, array);
  wtu.glErrorShouldBe(gl, gl.INVALID_OPERATION, "texSubImage3D from pbo with PREMULTIPLY_ALPHA=true should fail");
  gl.pixelStorei(gl.UNPACK_PREMULTIPLY_ALPHA_WEBGL, false);
}

function runRegressionTests(gl) {
  debug("");
  debug("The following test serves as a regression test for crbug.com/774174");
  var array = new Uint16Array(32);
  gl.pixelStorei(gl.UNPACK_ROW_LENGTH, 4);
  gl.pixelStorei(gl.UNPACK_PREMULTIPLY_ALPHA_WEBGL, 6);
  var tex = gl.createTexture();
  gl.bindTexture(gl.TEXTURE_2D, tex);
  gl.texSubImage2D(gl.TEXTURE_2D, 4, 7, 5, 8, 5, gl.RGB, gl.UNSIGNED_SHORT_5_5_5_1, array);
  // At this point, the Chrome ASAN build used to crash.
  testPassed("The regression test for crbug.com/774174 doesn't crash");
  wtu.glErrorShouldBe(gl, gl.INVALID_OPERATION, "Calling texSubImage2D without initializing the texture is illegal");
  gl.pixelStorei(gl.UNPACK_ROW_LENGTH, 0);
  gl.pixelStorei(gl.UNPACK_PREMULTIPLY_ALPHA_WEBGL, false);
}

var gl = wtu.create3DContext("example", undefined, 2);
if (!gl) {
  testFailed("Fail to get a WebGL context");
} else {
  runTests(gl);
  runNegativeTests(gl);
  runRegressionTests(gl);
}

debug("");
var successfullyParsed = true;
</script>
<script src="../../../js/js-test-post.js"></script>
</body>
</html>