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Diffstat (limited to 'documentation/src/opengl.dox')
| -rw-r--r-- | documentation/src/opengl.dox | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/documentation/src/opengl.dox b/documentation/src/opengl.dox index 668e26ef9..c80d4fd85 100644 --- a/documentation/src/opengl.dox +++ b/documentation/src/opengl.dox @@ -614,6 +614,27 @@ glewExperimental = GL_TRUE; \endcode before the glewInit() call. +\par Testing for success of the glewInit() call +Testing whether the glewInit() call is successful is to be done as follows: +\code +#include <FL/platform.H> // defines FLTK_USE_WAYLAND under the Wayland platform +#include <FL/Fl.H> // for Fl::warning() +#ifndef __APPLE__ +# if defined(_WIN32) +# define GLEW_STATIC 1 +# endif +# include <GL/glew.h> + + GLenum err = glewInit(); // defines pters to functions of OpenGL V 1.2 and above +# ifdef FLTK_USE_WAYLAND + // glewInit returns GLEW_ERROR_NO_GLX_DISPLAY with Wayland + if (err == GLEW_ERROR_NO_GLX_DISPLAY) err = GLEW_OK; +# endif + if (err != GLEW_OK) Fl::warning("glewInit() failed returning %u", err); +#endif // ! __APPLE__ +\endcode + + \par Changes in the build process Link with libGLEW.so (on Unix/Linux), libglew32.a (with MinGW) or glew32.lib (with MS Visual Studio); no change is needed on the Mac OS platform. |