| [AD] OpenGL 3.0 fails on Windows |
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- To: allegro-developers@xxxxxxxxxxxxxxxxxx
- Subject: [AD] OpenGL 3.0 fails on Windows
- From: Karl Robillard <krobillard@xxxxxxxx>
- Date: Tue, 12 Oct 2021 17:08:17 -0400
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al_create_display() fails when the ALLEGRO_OPENGL_3_0 flag is used on Windows.
I am building the examples/ex_shader.cpp program with the following
modification:
display_flags = ALLEGRO_OPENGL | ALLEGRO_OPENGL_3_0 |
ALLEGRO_OPENGL_FORWARD_COMPATIBLE;
After linking with the debug libraries the allegro.log shows these errors:
display E wgl_disp.c:711 get_available_pixel_formats_ext [ 0.3711
2] WGL_ARB/EXT_pf not supported.
display I wgl_disp.c:785 get_available_pixel_formats_old [ 0.4048
8] Got 100 visuals.
...
display I wgl_disp.c:811 get_available_pixel_formats_old [ 0.4336
8] 44 visuals are good enough.
display I wgl_disp.c:852 select_pixel_format [ 0.4385
5] Chose visual no. 1
...
display E wgl_disp.c:943 create_display_internals [
0.45363] Unable to create a render context! Invalid handle.
display I wgl_disp.c:1310 display_thread_proc [
0.46417] wgl display thread exits
display E display.c:55 al_create_display [ 0.46502]
Failed to create display (NULL)
I am using the allegro-x86_64-w64-mingw32-gcc-10.2.0-posix-seh-
static-5.2.7.0.zip SDK. The example fails this way when running on Windows 7
and with Wine on Linux. It runs fine in both environments when only
ALLEGRO_OPENGL is used. I do not have a Windows 10 machine to test on.
Is there an Allegro test or example specifically for OpenGL 3.0?
-Karl