Refactor Unix OpenGL code to avoid using static attributes array.

Put the context attributes in wxGLCanvasX11 itself instead.

See #16402.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@77073 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/unix/glx11.h

@@ -72,6 +72,13 @@ public:
     virtual Window GetXWindow() const = 0;
 
 
+    // GLX-specific methods
+    // --------------------
+
+    // return attribs for glXCreateContextAttribsARB
+    const int *GetGLXContextAttribs() const { return m_glxContextAttribs; }
+
+
     // override some wxWindow methods
     // ------------------------------
 
@@ -105,8 +112,13 @@ public:
                                 GLXFBConfig **pFBC, XVisualInfo **pXVisual);
 
 private:
+    // initializes glxContextAttribs as defined by wxattrs which must be
+    // 0-terminated
+    static void InitGLXContextAttribs(const int *wxattrs, int *glxctxattribs);
+
     // fills in glattrs with attributes defined by wxattrs which must be
     // 0-terminated if it is non-NULL
+    // will ignore any gl context attribs
     //
     // n is the max size of glattrs, false is returned if we overflow it, it
     // should be at least 16 to accommodate the default attributes
@@ -122,6 +134,10 @@ private:
     // the global/default versions of the above
     static GLXFBConfig *ms_glFBCInfo;
     static XVisualInfo *ms_glVisualInfo;
+
+    // max 8 attributes plus terminator
+    // if first is 0, create legacy context
+    int m_glxContextAttribs[9];
 };
 
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