Class Fl_Gl_Window_Driver, with its platform-specific derived classes, is created
to hold platform-specific, OpenGL code.
File gl_draw.cxx still needs to be converted to the driver model.
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This file contained nearly only platform-specific code.
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File fl_utf8.h defines the xchar type with a platform-dependent value (wchar_t or unsigned short).
But it is used exclusively by WIN32 code (0 use in cross-platform code, 0 use in APPLE
or in USE_X11 code).
Thus, we can just get rid of this type and replace it by wchar_t where it is used.
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fl_gc remains usable by the application as a hook into the system.
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Searching for __APPLE, WIN32 or X11 did give me many false results. I instead marked most ifdef's that I would like to get rid of with the text // PORTME:, so they can be easily found by a global search.
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This commit is the accumulated patch introduced in branch 1.3
in svn r 11094, 11095, and 11096.
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Methods Fl::event_x_pixel() and Fl::event_y_pixel() committed at r.10941
are removed. Instead method Fl_Gl_Window::pixels_per_unit() is added.
The documentation explains in more detail how to write cross-platform
FLTK code supporting high resolution OpenGL windows on retina displays.
The examples/OpenGL3test.cxx app exercises Fl_Gl_Window::pixels_per_unit().
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extension name instead of old GL_TEXTURE_RECTANGLE_EXT.
Also, use the GL_BGRA format that is preferred for GL textures,
according to "Optimal Data Formats and Types" from
"Best Practices for Working with Texture Data".
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XGetUtf8FontAndGlyph was referenced in libfltk_gl if configured w/o xft
and defined in libfltk, but not exported (regression since 1.3.3).
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by function gl_font() of file src/gl_draw.cxx (X11-specific).
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All changes are mac-specific, except a very minor change in file src/gl_draw.cxx
where string drawing wrongly claimed to support @symbol, not possible
because symbols are drawn using non-GL primitives.
Unchanged application code can use the new FLTK code.
In addition, the new code allows mac applications to draw OpenGL scenes
at high resolution on so-called 'retina' displays, but this requires some
support from app code. They must call, before opening GL windows,
Fl::use_high_resolution(1);
and change their glViewport() calls as follows
glViewport(0, 0, pxel_w(), pixel_h());
This uses 2 new member functions of the Fl_Gl_Window class,
pixel_w() and pixel_h() returning the window dimensions in pixel
units, that is, twice the w() and h() when the window is mapped
on a retina display.
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The fix invalidates the pile of string textures after each Fl_Gl_Window deletion.
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class to prepare for the future definition of graphics drivers that fully deal with text measurement.
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