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Re: [Visualpython-users] new version crashed on Windows XP
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From: Bruce S. <Bru...@nc...> - 2008-12-16 22:50:59
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David Scherer responds as follows:<br>
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<pre> if ( ARB_multitexture = d.hasExtension( "GL_ARB_multitexture" ) ) {
getPFN( glActiveTexture, d, "glActiveTextureARB" );
}
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This fix can't be right. Either
glActiveTextureARB is part of that extension, in which case it MUST be
present if that name string is present, or it isn't, in which case the
wrong name string is being tested or the wrong function loaded. Or
there is a very serious bug in his drivers.<br>
<br>
Bruce Sherwood<br>
<br>
P.S. What exactly is your graphics hardware/software?<br>
<br>
CL wrote:
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cite="mid:d69...@ma..."
type="cite">
<pre wrap="">Hi Bruce
I have built vpython and found that the following code can fix the
problem on my PC:
The first crash is at ShowWindow in display::create() in windisplay.cpp
I've modifed it to:
if (!wglMakeCurrent( dev_context, gl_context))
WIN32_CRITICAL_ERROR( "wglMakeCurrent failed");
ShowWindow( widget_handle, SW_SHOW);
wglMakeCurrent( NULL, NULL );
Look like my video driver insist to have wglMakeCurrent called before ShowWindow
The second crash is at gl_extensions.cpp
template <class PFN>
void getPFN( PFN& func, display_kernel& d, const char* name ) {
func = reinterpret_cast<PFN>( d.getProcAddress( name ) );
if (!func)
throw std::runtime_error(
("Unable to get extension function: " +
(std::string)name + " even though the extension is advertised.").c_str() );
}
When it is loading GL_ARB_multitexture
if ( ARB_multitexture = d.hasExtension( "GL_ARB_multitexture" ) ) {
F( glActiveTexture );
}
The entry point glActiveTexture is not defined in my driver. I believe
it is also not defined in most old drivers. Since it is not defined,
an exception is flew. The exception is not handled.
I've changed it to:
if ( ARB_multitexture = d.hasExtension( "GL_ARB_multitexture" ) ) {
getPFN( glActiveTexture, d, "glActiveTextureARB" );
}
After that, it is working fine. Textures are not supported, as vpython
seems requires shader extensions in order to support texture.
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