nux-1.16.0
GLPBuffer.h
00001 /*
00002  * Copyright 2010 Inalogic® Inc.
00003  *
00004  * This program is free software: you can redistribute it and/or modify it
00005  * under the terms of the GNU Lesser General Public License, as
00006  * published by the  Free Software Foundation; either version 2.1 or 3.0
00007  * of the License.
00008  *
00009  * This program is distributed in the hope that it will be useful, but
00010  * WITHOUT ANY WARRANTY; without even the implied warranties of
00011  * MERCHANTABILITY, SATISFACTORY QUALITY or FITNESS FOR A PARTICULAR
00012  * PURPOSE.  See the applicable version of the GNU Lesser General Public
00013  * License for more details.
00014  *
00015  * You should have received a copy of both the GNU Lesser General Public
00016  * License along with this program. If not, see <http://www.gnu.org/licenses/>
00017  *
00018  * Authored by: Jay Taoko <jaytaoko@inalogic.com>
00019  *
00020  */
00021 
00022 
00023 #ifndef __PBUFFERS_H__
00024 #define __PBUFFERS_H__
00025 
00026 #if defined(WIN32)
00027 #include "GLResource.h"
00028 
00029 #  pragma warning (disable : 4786)
00030 #elif defined(UNIX)
00031 #  include <GL/glx.h>
00032 #  include <GL/glxext.h>
00033 #elif defined(__APPLE__)
00034 #  include <AGL/agl.h>
00035 #endif
00036 
00037 #include <string>
00038 #include <vector>
00039 
00040 // The pixel format for the pbuffer is controlled by the mode string passed
00041 // into the PBuffer constructor. This string can have the following attributes:
00042 //
00043 // r                    - r pixel format (for float buffer).
00044 // rg                   - rg pixel format (for float buffer).
00045 // rgb          - rgb pixel format. 8 bit or 16/32 bit in float buffer mode
00046 // rgba         - same as "rgb alpha" string
00047 // alpha        - must have alpha channel
00048 // depth        - must have a depth buffer
00049 // depth=n      - must have n-bit depth buffer
00050 // stencil      - must have a stencil buffer
00051 // double       - must support double buffered rendering
00052 // samples=n    - must support n-sample antialiasing (n can be 2 or 4)
00053 // float=n      - must support n-bit per channel floating point
00054 //
00055 // texture2D
00056 // textureRECT
00057 // textureCUBE  - must support binding pbuffer as texture to specified target
00058 //              - binding the depth buffer is also supporting by specifying
00059 //                '=depth' like so: texture2D=depth or textureRECT=depth
00060 //              - the internal format of the texture will be rgba by default or
00061 //                float if pbuffer is floating point
00062 //
00063 
00064 namespace nux
00065 {
00066 
00067   class PBuffer
00068   {
00069   public:
00070     // see above for documentation on strMode format
00071     // set managed to true if you want the class to cleanup OpenGL objects in destructor
00072     PBuffer (const char *strMode, bool managed = false);
00073     ~PBuffer();
00074 
00075     bool Initialize (int iWidth, int iHeight, bool bShareContexts, bool bShareObjects);
00076     void Destroy();
00077 
00078     void Activate (PBuffer *current = NULL); // to switch between pbuffers, pass active pbuffer as argument
00079     void Deactivate();
00080 
00081 #if defined(WIN32)
00082     int Bind (int iBuffer);
00083     int Release (int iBuffer);
00084 
00085     void HandleModeSwitch();
00086 #endif
00087 
00088     unsigned int GetSizeInBytes();
00089     unsigned int CopyToBuffer (void *ptr, int w = -1, int h = -1);
00090 
00091     inline int GetNumComponents()
00092     {
00093       return m_iNComponents;
00094     }
00095 
00096     inline int GetBitsPerComponent()
00097     {
00098       return m_iBitsPerComponent;
00099     }
00100 
00101     inline int GetWidth()
00102     {
00103       return m_iWidth;
00104     }
00105 
00106     inline int GetHeight()
00107     {
00108       return m_iHeight;
00109     }
00110 
00111     inline bool IsSharedContext()
00112     {
00113       return m_bSharedContext;
00114     }
00115 
00116 #if defined(WIN32)
00117     inline bool IsTexture()
00118     {
00119       return m_bIsTexture;
00120     }
00121 #endif
00122 
00123   protected:
00124 #if defined(NUX_OS_WINDOWS)
00125     HDC         m_hDC;     
00126     HGLRC       m_hGLRC;   
00127     HPBUFFERARB m_hPBuffer;
00128 
00129     HGLRC       m_hOldGLRC;
00130     HDC         m_hOldDC;
00131 
00132     std::vector<int> m_pfAttribList;
00133     std::vector<int> m_pbAttribList;
00134 
00135     bool m_bIsTexture;
00136 #elif defined(NUX_OS_LINUX)
00137     Display    *m_pDisplay;
00138     GLXPbuffer  m_glxPbuffer;
00139     GLXContext  m_glxContext;
00140 
00141     Display    *m_pOldDisplay;
00142     GLXPbuffer  m_glxOldDrawable;
00143     GLXContext  m_glxOldContext;
00144 
00145     std::vector<int> m_pfAttribList;
00146     std::vector<int> m_pbAttribList;
00147 #elif defined(NUX_OS_MACOSX)
00148     AGLContext  m_context;
00149     WindowPtr   m_window;
00150     std::vector<int> m_pfAttribList;
00151 #endif
00152 
00153     int m_iWidth;
00154     int m_iHeight;
00155     int m_iNComponents;
00156     int m_iBitsPerComponent;
00157 
00158     const char *m_strMode;
00159     bool m_bSharedContext;
00160     bool m_bShareObjects;
00161 
00162   private:
00163     std::string getStringValue (std::string token);
00164     int getIntegerValue (std::string token);
00165 #if defined(NUX_OS_WINDOWS) || defined(NUX_OS_LINUX)
00166     void parseModeString (const char *modeString, std::vector<int> *pfAttribList, std::vector<int> *pbAttribList);
00167 
00168     bool m_bIsBound;
00169     bool m_bIsActive;
00170     bool m_bManaged;
00171 #endif
00172   };
00173 }
00174 
00175 #endif // __PBUFFERS_H__
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