1 /**************************************************************************** 2 Copyright (c) 2008-2010 Ricardo Quesada 3 Copyright (c) 2011-2012 cocos2d-x.org 4 Copyright (c) 2013-2014 Chukong Technologies Inc. 5 6 http://www.cocos2d-x.org 7 8 Permission is hereby granted, free of charge, to any person obtaining a copy 9 of this software and associated documentation files (the "Software"), to deal 10 in the Software without restriction, including without limitation the rights 11 to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 12 copies of the Software, and to permit persons to whom the Software is 13 furnished to do so, subject to the following conditions: 14 15 The above copyright notice and this permission notice shall be included in 16 all copies or substantial portions of the Software. 17 18 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 19 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 20 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 21 AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 22 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 23 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 24 THE SOFTWARE. 25 ****************************************************************************/ 26 27 /** 28 * FBO class that grabs the the contents of the screen 29 * @class 30 * @extends cc.Class 31 */ 32 cc.Grabber = cc.Class.extend({ 33 _FBO:null, 34 _oldFBO:null, 35 _oldClearColor:null, 36 37 _gl:null, 38 39 /** 40 * constructor of cc.Grabber 41 */ 42 ctor:function () { 43 cc._checkWebGLRenderMode(); 44 this._gl = cc._renderContext; 45 this._oldClearColor = [0, 0, 0, 0]; 46 this._oldFBO = null; 47 // generate FBO 48 this._FBO = this._gl.createFramebuffer(); 49 }, 50 51 /** 52 * grab 53 * @param {cc.Texture2D} texture 54 */ 55 grab:function (texture) { 56 var locGL = this._gl; 57 this._oldFBO = locGL.getParameter(locGL.FRAMEBUFFER_BINDING); 58 // bind 59 locGL.bindFramebuffer(locGL.FRAMEBUFFER, this._FBO); 60 // associate texture with FBO 61 locGL.framebufferTexture2D(locGL.FRAMEBUFFER, locGL.COLOR_ATTACHMENT0, locGL.TEXTURE_2D, texture._webTextureObj, 0); 62 63 // check if it worked (probably worth doing :) ) 64 var status = locGL.checkFramebufferStatus(locGL.FRAMEBUFFER); 65 if (status != locGL.FRAMEBUFFER_COMPLETE) 66 cc.log("Frame Grabber: could not attach texture to frmaebuffer"); 67 locGL.bindFramebuffer(locGL.FRAMEBUFFER, this._oldFBO); 68 }, 69 70 /** 71 * should be invoked before drawing 72 * @param {cc.Texture2D} texture 73 */ 74 beforeRender:function (texture) { 75 var locGL = this._gl; 76 this._oldFBO = locGL.getParameter(locGL.FRAMEBUFFER_BINDING); 77 locGL.bindFramebuffer(locGL.FRAMEBUFFER, this._FBO); 78 79 // save clear color 80 this._oldClearColor = locGL.getParameter(locGL.COLOR_CLEAR_VALUE); 81 82 // BUG XXX: doesn't work with RGB565. 83 locGL.clearColor(0, 0, 0, 0); 84 85 // BUG #631: To fix #631, uncomment the lines with #631 86 // Warning: But it CCGrabber won't work with 2 effects at the same time 87 // glClearColor(0.0f,0.0f,0.0f,1.0f); // #631 88 89 locGL.clear(locGL.COLOR_BUFFER_BIT | locGL.DEPTH_BUFFER_BIT); 90 91 // glColorMask(true, true, true, false); // #631 92 }, 93 94 /** 95 * should be invoked after drawing 96 * @param {cc.Texture2D} texture 97 */ 98 afterRender:function (texture) { 99 var locGL = this._gl; 100 locGL.bindFramebuffer(locGL.FRAMEBUFFER, this._oldFBO); 101 locGL.colorMask(true, true, true, true); // #631 102 }, 103 104 /** 105 * delete FBO 106 */ 107 destroy:function(){ 108 this._gl.deleteFramebuffer(this._FBO); 109 } 110 }); 111