Separate platform init functions from platform-specific driver files

1 files changed, 64 insertions, 0 deletions

diff --git a/src/drivers/WinAPI/Fl_WinAPI_Gl_Window_Driver.H b/src/drivers/WinAPI/Fl_WinAPI_Gl_Window_Driver.H
new file mode 100644
index 000000000..efece9d19
--- /dev/null
+++ b/src/drivers/WinAPI/Fl_WinAPI_Gl_Window_Driver.H
@@ -0,0 +1,64 @@
+//
+// Class Fl_Wayland_Gl_Window_Driver for the Fast Light Tool Kit (FLTK).
+//
+// Copyright 2021-2022 by Bill Spitzak and others.
+//
+// This library is free software. Distribution and use rights are outlined in
+// the file "COPYING" which should have been included with this file.  If this
+// file is missing or damaged, see the license at:
+//
+//     https://www.fltk.org/COPYING.php
+//
+// Please see the following page on how to report bugs and issues:
+//
+//     https://www.fltk.org/bugs.php
+//
+
+#ifndef FL_WINAPI_GL_WINDOW_DRIVER_H
+#define FL_WINAPI_GL_WINDOW_DRIVER_H
+
+#include <config.h>
+#if HAVE_GL
+#include <FL/platform.H>
+#include "../../Fl_Gl_Window_Driver.H"
+#include <FL/gl.h>
+
+/* Implementation note about OpenGL drawing on the Wayland platform
+ 
+After eglCreateWindowSurface() with attributes {EGL_RENDER_BUFFER, EGL_SINGLE_BUFFER, EGL_NONE},
+eglQueryContext() reports that EGL_RENDER_BUFFER equals EGL_BACK_BUFFER.
+This experiment suggests that the platform only supports double-buffer drawing.
+Consequently, FL_DOUBLE is enforced in all Fl_Gl_Window::mode_ values under Wayland.
+*/
+
+class Fl_WinAPI_Gl_Window_Driver : public Fl_Gl_Window_Driver {
+  friend class Fl_Gl_Window_Driver;
+  Fl_WinAPI_Gl_Window_Driver(Fl_Gl_Window *win) : Fl_Gl_Window_Driver(win) {}
+  virtual float pixels_per_unit();
+  virtual int mode_(int m, const int *a);
+  virtual void make_current_after();
+  virtual void swap_buffers();
+  virtual void invalidate() {}
+  virtual int flush_begin(char& valid_f);
+  virtual Fl_Gl_Choice *find(int m, const int *alistp);
+  virtual GLContext create_gl_context(Fl_Window* window, const Fl_Gl_Choice* g, int layer = 0);
+  virtual void set_gl_context(Fl_Window* w, GLContext context);
+  virtual void delete_gl_context(GLContext);
+  virtual void make_overlay_current();
+  virtual void redraw_overlay();
+  virtual void* GetProcAddress(const char *procName);
+  virtual void draw_string_legacy(const char* str, int n);
+  virtual void gl_bitmap_font(Fl_Font_Descriptor *fl_fontsize);
+  virtual void get_list(Fl_Font_Descriptor *fd, int r);
+  virtual int genlistsize();
+#if HAVE_GL_OVERLAY
+  virtual void gl_hide_before(void *& overlay);
+  virtual int can_do_overlay();
+  virtual int overlay_color(Fl_Color i);
+  void make_overlay(void*&overlay);
+#endif
+};
+
+#endif // HAVE_GL
+
+#endif // FL_WINAPI_GL_WINDOW_DRIVER_H