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Add details to documentation of Fl_Wayland_Gl_Window_Driver::swap_buffers()

This commit is contained in:
ManoloFLTK 2023-07-08 09:23:38 +02:00
parent 3d03a5426b
commit 18befa5e81
1 changed files with 9 additions and 3 deletions
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12
documentation/src/wayland.dox
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@ -1052,12 +1052,12 @@ and puts in the returned \c Fl_Gl_Choice object the first matching configuration
The filtering gets done with bits \c EGL_WINDOW_BIT, to support the creation of window
surfaces, and \c EGL_OPENGL_BIT, to support the creation of OpenGL contexts.
EGL needs 2 more objects created for each \c Fl_Gl_Window of type
<tt>struct wl_egl_window</tt> and \c EGLSurface. Both are created by member
EGL needs 2 more objects created for each \c Fl_Gl_Window. They have types
<tt>struct wl_egl_window</tt> and \c EGLSurface, and are created by member
function \c Fl_Wayland_Gl_Window_Driver::make_current_before() which runs at the
beginning of \c Fl_Gl_Window::make_current().
The first argument of the call to \c wl_egl_window_create() therein has type
<tt>struct wl_surface *</tt> and is what connects EGL with the desired Wayland window.
<tt>struct wl_surface *</tt> and is what connects EGL with the targetted Wayland window.
EGL creates with \c eglCreateContext() an object of type \c EGLContext via member
function \c Fl_Wayland_Gl_Window_Driver::create_gl_context() called by
@ -1078,6 +1078,12 @@ emulate an overlay buffer to support Fl_Gl_Window objects overriding their
Then, it calls function \c eglSwapBuffers() after having called
\c wl_display_dispatch_pending() to synchronize EGL use
with the rest of the Wayland compositor's activity.
Function \c wl_display_dispatch_pending() calls the listeners attached to
commands the Wayland compositor recently sent to the client.
The fact that this function gets called during the process of drawing an Fl_Gl_Window
makes possible a scenario that cannot occur with other FLTK platforms : a GL window can be
closed while being drawn. Function \c Fl_Wayland_Window_Driver::hide() is written to
handle such scenario without error (see comments therein).
The overridden \c Fl_Wayland_Gl_Window_Driver::resize() function is implemented with
calls to \c wl_egl_window_get_attached_size() and \c wl_egl_window_resize().