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Better doc for using OpenGL version 3. 

git-svn-id: file:///fltk/svn/fltk/branches/branch-1.4@13023 ea41ed52-d2ee-0310-a9c1-e6b18d33e121
This commit is contained in:
Manolo Gouy 2018-08-21 07:45:32 +00:00
parent a3529e7c3f
commit 153b175d90
2 changed files with 10 additions and 15 deletions
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11
FL/Fl_Gl_Window.H
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@ -173,16 +173,7 @@ public:
The FL_OPENGL3 flag is required to access OpenGL version 3 or more
under the X11 and MacOS platforms; it's optional under Windows.
\note On the <b>Windows and Unix/Linux platforms</b>, FLTK produces
contexts for the highest OpenGL version supported by the hardware. Such contexts
are also compatible with lower OpenGL versions. On the <b>Apple OS X
platform</b>, it is necessary to decide whether the source code targets
OpenGL versions higher or lower than 3.0. By default, FLTK
creates contexts adequate for OpenGL versions 1 and 2. To get contexts
for OpenGL 3.0 or higher, the <tt>FL_OPENGL3</tt> flag and Mac OS
version 10.7 or higher are required (in that case the context is NOT
compatible with OpenGL versions 1 or 2).
See more details in \ref opengl3.
\version the <tt>FL_OPENGL3</tt> flag appeared in version 1.3.4
*/

14
documentation/src/opengl.dox
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@ -460,13 +460,17 @@ To access OpenGL 3.0 (or higher versions), use the <tt>FL_OPENGL3</tt> flag
when calling Fl_Gl_Window::mode(int a) or glutInitDisplayMode().
<b>On the Windows and Unix/Linux platforms</b>, FLTK creates contexts
implementing the highest OpenGL version supported by the hardware,
which are also compatible with lower OpenGL versions. Thus, FLTK allows
source code targeting any version of OpenGL. Access to functions from OpenGL
implementing the highest OpenGL version supported by the hardware.
Such contexts may also be compatible with lower OpenGL versions.
Access to functions from OpenGL
versions above 1.1 requires to load function pointers at runtime on these platforms.
FLTK recommends to use the GLEW library to perform this. It is therefore
necessary to install the GLEW library (see below). <b>On the macOS platform</b>,
MacOS 10.7 or above is required; GLEW is possible but not necessary.
necessary to install the GLEW library (see below).
<b>On the macOS platform</b>, MacOS 10.7 or above is required;
GLEW is possible but not necessary. FLTK creates contexts for OpenGL
versions 1 and 2 without the FL_OPENGL3
flag and for OpenGL versions 3.2 and above with it.
\par GLEW installation (Unix/Linux and Windows platforms)
GLEW is available as a package for most Linux distributions and in source