dom/canvas/test/webgl-conf/checkout/deqp/framework/common/tcuPixelFormat.js

   1 /*-------------------------------------------------------------------------
   2  * drawElements Quality Program OpenGL ES Utilities
   3  * ------------------------------------------------
   4  *
   5  * Copyright 2014 The Android Open Source Project
   6  *
   7  * Licensed under the Apache License, Version 2.0 (the "License");
   8  * you may not use this file except in compliance with the License.
   9  * You may obtain a copy of the License at
  10  *
  11  *      http://www.apache.org/licenses/LICENSE-2.0
  12  *
  13  * Unless required by applicable law or agreed to in writing, software
  14  * distributed under the License is distributed on an "AS IS" BASIS,
  15  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  16  * See the License for the specific language governing permissions and
  17  * limitations under the License.
  18  *
  19  */
  20
  21 'use strict';
  22 goog.provide('framework.common.tcuPixelFormat');
  23
  24 goog.scope(function() {
  25
  26 var tcuPixelFormat = framework.common.tcuPixelFormat;
  27
  28 /**
  29  * @constructor
  30  * @param {number=} r
  31  * @param {number=} g
  32  * @param {number=} b
  33  * @param {number=} a
  34  */
  35 tcuPixelFormat.PixelFormat = function(r, g, b, a) {
  36     this.redBits = r || 0;
  37     this.greenBits = g || 0;
  38     this.blueBits = b || 0;
  39     this.alphaBits = a || 0;
  40 };
  41
  42 /**
  43  * @param {WebGL2RenderingContext} context
  44  * @return {tcuPixelFormat.PixelFormat}
  45  */
  46 tcuPixelFormat.PixelFormatFromContext = function(context) {
  47     var r = /** @type {number} */ (context.getParameter(gl.RED_BITS));
  48     var g = /** @type {number} */ (context.getParameter(gl.GREEN_BITS));
  49     var b = /** @type {number} */ (context.getParameter(gl.BLUE_BITS));
  50     var a = /** @type {number} */ (context.getParameter(gl.ALPHA_BITS));
  51
  52     return new tcuPixelFormat.PixelFormat(r, g, b, a);
  53 };
  54
  55 /**
  56  * @param {number} r
  57  * @param {number} g
  58  * @param {number} b
  59  * @param {number} a
  60  * @return {boolean}
  61  */
  62 tcuPixelFormat.PixelFormat.prototype.equals = function(r, g, b, a) {
  63     return this.redBits === r &&
  64             this.greenBits === g &&
  65             this.blueBits === b &&
  66             this.alphaBits === a;
  67 };
  68
  69 /**
  70  * @return {Array<number>}
  71  */
  72 tcuPixelFormat.PixelFormat.prototype.getColorThreshold = function() {
  73     return [1 << (8 - this.redBits),
  74             1 << (8 - this.greenBits),
  75             1 << (8 - this.blueBits),
  76             (this.alphaBits > 0) ? (1 << (8 - this.alphaBits)) : 0];
  77 };
  78
  79 });