1 // Created on: 2013-08-25
2 // Created by: Kirill GAVRILOV
3 // Copyright (c) 2013-2014 OPEN CASCADE SAS
5 // This file is part of Open CASCADE Technology software library.
7 // This library is free software; you can redistribute it and/or modify it under
8 // the terms of the GNU Lesser General Public License version 2.1 as published
9 // by the Free Software Foundation, with special exception defined in the file
10 // OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT
11 // distribution for complete text of the license and disclaimer of any warranty.
13 // Alternatively, this file may be used under the terms of Open CASCADE
14 // commercial license or contractual agreement.
16 #ifndef _OpenGl_Caps_H__
17 #define _OpenGl_Caps_H__
19 #include <Standard_Type.hxx>
20 #include <Standard_Transient.hxx>
21 #include <OpenGl_ShaderProgramDumpLevel.hxx>
23 //! Class to define graphic driver capabilities.
24 //! Notice that these options will be ignored if particular functionality does not provided by GL driver
25 class OpenGl_Caps : public Standard_Transient
28 public: //! @name flags to disable particular functionality, should be used only for testing purposes!
30 Standard_Boolean vboDisable; //!< flag permits VBO usage, will significantly affect performance (OFF by default)
31 Standard_Boolean pntSpritesDisable; //!< flag permits Point Sprites usage, will significantly affect performance (OFF by default)
32 Standard_Boolean keepArrayData; //!< Disables freeing CPU memory after building VBOs (OFF by default)
33 Standard_Boolean ffpEnable; //!< Enables FFP (fixed-function pipeline), do not use built-in GLSL programs (ON by default on desktop OpenGL and OFF on OpenGL ES)
34 Standard_Boolean useSystemBuffer; //!< Enables usage of system backbuffer for blitting (OFF by default on desktop OpenGL and ON on OpenGL ES for testing)
35 Standard_Integer swapInterval; //!< controls swap interval - 0 for VSync off and 1 for VSync on, 1 by default
37 public: //! @name context creation parameters
40 * Specify that driver should not swap back/front buffers at the end of frame.
41 * Useful when OCCT Viewer is integrated into existing OpenGL rendering pipeline as part,
42 * thus swapping part is performed outside.
46 Standard_Boolean buffersNoSwap;
49 * Request stereoscopic context (with Quad Buffer). This flag requires support in OpenGL driver.
53 Standard_Boolean contextStereo;
56 * Request debug GL context. This flag requires support in OpenGL driver.
58 * When turned on OpenGL driver emits error and warning messages to provided callback
59 * (see OpenGl_Context - messages will be printed to standard output).
60 * Affects performance - thus should not be turned on by products in released state.
62 * OFF by default. Currently implemented only for Windows (WGL).
64 Standard_Boolean contextDebug;
67 * Request debug GL context to emit messages within main thread (when contextDebug is specified!).
69 * Some implementations performs GL rendering within dedicated thread(s),
70 * in this case debug messages will be pushed from unknown thread making call stack useless,
71 * since it does not interconnected to application calls.
72 * This option asks GL driver to switch into synchronized implementation.
73 * Affects performance - thus should not be turned on by products in released state.
77 Standard_Boolean contextSyncDebug;
80 * Disable hardware acceleration.
82 * This flag overrides default behavior, when accelerated context always preferred over software ones:
83 * - on Windows will force Microsoft software implementation;
84 * - on Mac OS X, forces Apple software implementation.
86 * Software implementations are dramatically slower - should never be used.
88 * OFF by default. Currently implemented only for Windows (WGL) and Mac OS X (Cocoa).
90 Standard_Boolean contextNoAccel;
93 * Request backward-compatible GL context. This flag requires support in OpenGL driver.
95 * Backward-compatible profile includes deprecated functionality like FFP (fixed-function pipeline),
96 * and might be useful for compatibility with application OpenGL code.
98 * Most drivers support all features within backward-compatibility profile,
99 * but some limit functionality to OpenGL 2.1 (e.g. OS X) when core profile is not explicitly requested.
101 * Requires OpenGL 3.2+ drivers.
102 * Has no effect on OpenGL ES 2.0+ drivers (which do not provie FFP compatibility).
103 * Interacts with ffpEnable option, which should be disabled within core profile.
107 Standard_Boolean contextCompatible;
109 public: //! @name flags to activate verbose output
111 //! Print GLSL program compilation/linkage warnings, if any. OFF by default.
112 Standard_Boolean glslWarnings;
114 //! Suppress redundant messages from debug GL context. ON by default.
115 Standard_Boolean suppressExtraMsg;
117 //! Print GLSL program source code. OFF by default.
118 OpenGl_ShaderProgramDumpLevel glslDumpLevel;
120 public: //! @name class methods
122 //! Default constructor - initialize with most optimal values.
123 Standard_EXPORT OpenGl_Caps();
126 Standard_EXPORT virtual ~OpenGl_Caps();
129 Standard_EXPORT OpenGl_Caps& operator= (const OpenGl_Caps& theCopy);
134 OpenGl_Caps (const OpenGl_Caps& );
138 DEFINE_STANDARD_RTTIEXT(OpenGl_Caps,Standard_Transient) // Type definition
142 DEFINE_STANDARD_HANDLE(OpenGl_Caps, Standard_Transient)
144 #endif // _OpenGl_Caps_H__