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| Mojito Sorbet |
 Posted: Tue Jul 20, 2010 8:52 pm |
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Joined: 20 Jul 2010
Posts: 5
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I am on Ubuntu 9.10, where I installed OTP R14B04 myself, including wx. The wx:demo() works fine, including the "gl" demo with the 3D graphics.
I copied the ex_gl.erl source file, and it's two image files, from otp_src_R13B04/lib/wx/examples/demo into my project, compiled it unchanged, and invoked it with an appropriate environment, passing in a parent window for it to use. But I get this error:
Code: exception exit: {no_gl_context,{gl,viewport,0}}
Using the debugger, it seems to fail on the first line of 'load_texture_by_image' where it calls wxImage:getWidth.
The documentation talks about wxGLContext, but there are no definitions for those routines in the Erlang binding, and the example code does not use it anyway, and works fine in the demo version in the library. What is different? |
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| Mojito Sorbet |
| Posted: Wed Jul 21, 2010 12:10 pm |
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Joined: 20 Jul 2010
Posts: 5
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I put in a call to wxGLCanvas:getContext to see what had been set up by wxGLCanvas:new. The value returned was
Code: {wx_ref,0,wxGLContext,[]}
This looks odd because of the zero in there. I observe through the trace output that those handles get created in increasing numerical order and the value for the Canvas itself is
Code: {wx_ref,50,wxGLCanvas,[]} |
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| Mojito Sorbet |
| Posted: Thu Jul 22, 2010 1:40 pm |
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Joined: 20 Jul 2010
Posts: 5
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| Dan provided the answer: the window has to have been displayed before you initialize the OpenGL context. |
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