On 24.03.2015 14:25, Emmanuele Bassi wrote:
> On 24 March 2015 at 10:45, LRN wrote:
>>>> * GDK supports rendering windows using OpenGL; currently
>>>> this is implemented for X11 and Wayland using libepoxy
>>>>
>>>> * GtkGLArea is a new widget for rendering with OpenGL
>>>
>>> I thought it would also be good to let people know about this, rendering
>>> windows using OpenGL is also implemented on Microsoft Windows as well,
>>> also using libepoxy.
>>
>> Provided that libepoxy is appropriately-patched to consider OpenGL 1.1 to be
>> the core implementation provided by opengl32.dll
>> (otherwise it may crash at runtime when you try to call OpenGL 1.1 functions).
>
> You mean all functions that were added in OpenGL 1.1 and not
> deprecated after OpenGL 3.2?
>
> GTK+ does not support legacy profiles, so using deprecated, pre-3.2
> API is not going to be possible in any case.
Well, according to libepoxy, glDrawArrays is a 1.1 function:
> static PFNGLDRAWARRAYSPROC
> epoxy_glDrawArrays_resolver(void)
> {
> static const enum gl_provider providers[] = {
> Desktop_OpenGL_1_1,
> OpenGL_ES_2_0,
> OpenGL_ES_1_0,
> GL_extension_GL_EXT_vertex_array,
> gl_provider_terminator
> };
> static const uint16_t entrypoints[] = {
> 10254 /* "glDrawArrays" */,
> 10254 /* "glDrawArrays" */,
> 10254 /* "glDrawArrays" */,
> 10267 /* "glDrawArraysEXT" */,
> };
> return gl_provider_resolver(entrypoint_strings + 10254 /* "glDrawArrays" */,
> providers, entrypoints);
> }
and gtk-demo does use it[1].
[1] https://git.gnome.org/browse/gtk+/tree/demos/gtk-demo/glarea.c#n262
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