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Query

<!-- ##### SECTION Short_Description ##### -->
Functions to query OpenGL support information

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<!-- ##### SECTION See_Also ##### -->
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<!-- ##### USER_FUNCTION GdkGLProc ##### -->
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<!-- ##### FUNCTION gdk_gl_query_extension ##### -->
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@Returns: 


<!-- ##### FUNCTION gdk_gl_query_extension_for_display ##### -->
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@display: 
@Returns: 


<!-- ##### FUNCTION gdk_gl_query_version ##### -->
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@major: 
@minor: 
@Returns: 


<!-- ##### FUNCTION gdk_gl_query_version_for_display ##### -->
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@display: 
@major: 
@minor: 
@Returns: 


<!-- ##### FUNCTION gdk_gl_query_gl_extension ##### -->
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@extension: 
@Returns: 


<!-- ##### FUNCTION gdk_gl_get_proc_address ##### -->
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@proc_name: 
@Returns: 


