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Documentation: make clear that "Using OpenGL in Normal FLTK Windows" isn't useful with macOS.

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ManoloFLTK 2019-10-27 08:37:33 +01:00
parent d1e346a7d2
commit ffcf8bd0b7
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documentation/src/opengl.dox
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@ -14,7 +14,7 @@ OpenGL calls to draw the display. Your main program should call
(somewhat later) FLTK will call \p draw().
With a bit of care you can also use OpenGL to draw into
normal FLTK windows. This allows you to use Gouraud shading for
normal FLTK windows (see \ref opengl_normal below). This allows you to use Gouraud shading for
drawing your widgets. To do this you use the
\ref opengl_gl_start "gl_start()" and
\ref opengl_gl_finish "gl_finish()"
@ -199,6 +199,10 @@ and OpenGL under macOS (see \ref osissues_retina)
\section opengl_normal Using OpenGL in Normal FLTK Windows
\note Drawing both with OpenGL and Quartz in a normal FLTK window is not possible
with the macOS platform. This technique is therefore not useful under macOS because
it permits nothing more than what is possible with class Fl_Gl_Window.
You can put OpenGL code into the \p draw() method, as described in
\ref subclassing_drawing
in the previous chapter, or into the code for a