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Doc: more details about installation of GLEW.

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ManoloFLTK 2022-09-29 12:04:17 +02:00
parent da66e21e1d
commit 694eaef99c
1 changed files with 25 additions and 8 deletions

33
documentation/src/opengl.dox

@ -550,7 +550,7 @@ and OpenGL 3.
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, X11, and Wayland platforms</b>, FLTK creates contexts
<b>On the Windows and Linux platforms</b>, FLTK creates contexts
implementing the highest OpenGL version supported by the hardware.
Such contexts may also be compatible with lower OpenGL versions.
Access to functions from OpenGL
@ -561,14 +561,31 @@ 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.
flag and for OpenGL versions 3.2 and above (<b>but not below</b>) with it.
\par GLEW installation (X11, Wayland, and Windows platforms)
GLEW is available as a package for most Linux distributions and in source
form at http://glew.sourceforge.net/.
For the Windows platform, a Visual Studio static library (glew32.lib) can
be downloaded from the same web site; a MinGW-style static library (libglew32.a)
can be built from source with the make command.
\par GLEW installation (Linux and Windows platforms)
FLTK needs a header file, \c GL/glew.h, and a library, \c libGLEW.* or
equivalent, to support OpenGL 3 and above.
<br>These can be obtained for most Linux distributions
by installing package libglew-dev.
<br>For the Windows platform :
<ul>
<li> the header and a Visual Studio static library (glew32.lib) can
be downloaded from http://glew.sourceforge.net/ ;
<li> a MinGW-style static library (libglew32.a)
can be built from source (same web site) with the make command.
Alternatively, pre-built files are available for these architectures :
<ul><li>x86: download files
<a href=https://github.com/McNopper/OpenGL/blob/42fa2736e2b37db1df99c2b205279855ec6f2b1d/External/x86/Windows/MinGW/include/GL/glew.h>
glew.h</a> and
<a href=https://github.com/McNopper/OpenGL/blob/42fa2736e2b37db1df99c2b205279855ec6f2b1d/External/x86/Windows/MinGW/lib/libglew32.a>
libglew32.a</a>;
<li>x86_64: install GLEW as an MSYS2 package with command :
\code
pacman -S mingw-w64-x86_64-glew
\endcode
</ul>
</ul>
\par Source-level changes for OpenGL 3:
\li Put this in all OpenGL-using source files (instead of \#include <FL/gl.h>,