clearbufferfv-with-alpha-false.html

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Copyright (c) 2019 The Khronos Group Inc.

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<title>Test clearBufferfv with alpha:false canvas</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>

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<canvas id="canvas" width="20" height="20"> </canvas>

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"use strict";

description("This tests the operation of clearBufferfv with the back buffer of an alpha:false canvas.");

function verifyOnePixel(readFormat, readType, arrayType, expectedColor) {

  var buffer = new arrayType(4);

  gl.readPixels(0, 0, 1, 1, readFormat, readType, buffer);

  if (buffer[0] == expectedColor[0] &&

      buffer[1] == expectedColor[1] &&

      buffer[2] == expectedColor[2] &&

      buffer[3] == expectedColor[3]) {

    testPassed("clearBufferfv set the color buffer to the correct value");

  } else {

    testFailed("clearBufferfv failed to work. Expected: " + expectedColor + ", got: " + buffer);

function testClearBuffer(func, format, arrayType, readFormat, readType, readArrayType) {

  debug("");

  debug("Testing " + func);

  var srcData = new arrayType([0, 1, 0, 0]);

  gl[func](gl.COLOR, 0, srcData);

  wtu.glErrorShouldBe(gl, gl.NO_ERROR, "clearBuffer with no srcOffset should succeed");

  // Back buffer has no alpha channel

  verifyOnePixel(readFormat, readType, Uint8Array, [0, 255, 0, 255]);

var wtu = WebGLTestUtils;

var canvas = document.getElementById("canvas");

var gl = wtu.create3DContext(canvas, { alpha:false }, 2);

if (!gl) {

  testFailed("context does not exist");

} else {

  testPassed("context exists");

  var testCases = [

      func: "clearBufferfv", format: gl.RGBA, arrayType: Float32Array,

      readFormat: gl.RGBA, readType: gl.UNSIGNED_BYTE, readArrayType: Uint8Array,

},

];

  for (var tt = 0; tt < testCases.length; ++tt) {

    var test = testCases[tt];

    if (test.extension && !gl.getExtension(test.extension))

      continue;

    testClearBuffer(test.func, test.format, test.arrayType,

                    test.readFormat, test.readType, test.readArrayType);

debug("");

wtu.glErrorShouldBe(gl, gl.NO_ERROR, "should be no error");

var successfullyParsed = true;

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