1 /*
   2  * Copyright (c) 2012, 2013, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 
  26 #import <Cocoa/Cocoa.h>
  27 
  28 #import <OpenGL/gl.h>
  29 #import <OpenGL/OpenGL.h>
  30 
  31 @protocol GlassOffscreenProtocol
  32 
  33 // as destination (to draw into)
  34 - (void)bindForWidth:(GLuint)width andHeight:(GLuint)height;
  35 
  36 // as source (to show)
  37 - (GLuint)texture;
  38 - (void)blitForWidth:(GLuint)width andHeight:(GLuint)height;
  39 
  40 - (GLuint)width;
  41 - (GLuint)height;
  42 - (GLuint)fbo;
  43 
  44 @end
  45 
  46 @interface GlassOffscreen : NSObject <GlassOffscreenProtocol>
  47 {
  48     CGLContextObj               _ctx;
  49     CGLContextObj               _ctxToRestore;
  50     
  51     id<GlassOffscreenProtocol>  _offscreen;
  52     
  53     GLboolean                   _dirty;
  54     
  55     GLfloat                     _backgroundR;
  56     GLfloat                     _backgroundG;
  57     GLfloat                     _backgroundB;
  58     GLfloat                     _backgroundA;
  59 
  60     CAOpenGLLayer*              _layer;
  61 }
  62 
  63 - (id)initWithContext:(CGLContextObj)ctx;
  64 - (CGLContextObj)getContext;
  65 
  66 - (void)setBackgroundColor:(NSColor*)color;
  67 
  68 - (void)blit;
  69 - (GLuint)texture;
  70 
  71 - (CAOpenGLLayer*)getLayer;
  72 - (void)setLayer:(CAOpenGLLayer*)new_layer;
  73 
  74 - (GLboolean)isDirty;
  75 
  76 - (void)blitFromOffscreen:(GlassOffscreen*) other_offscreen;
  77 
  78 @end