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libsst-glapi/SST_GLAPIResolve_Win32.c

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+/*
+	SST_GLAPIResolve_Win32.c
+	Author: Patrick Baggett <ptbaggett@762studios.com>
+	Created: 12/12/2012
+
+	Purpose: 
+
+	Runtime OpenGL symbol resolution (Win32)
+
+	License:
+
+	This program is free software. It comes without any warranty, to
+	the extent permitted by applicable law. You can redistribute it
+	and/or modify it under the terms of the Do What The Fuck You Want
+	To Public License, Version 2, as published by Sam Hocevar. See
+	http://sam.zoy.org/wtfpl/COPYING for more details.
+
+*/
+
+#include <windows.h>
+#include "GLAPIPrivate.h"
+
+typedef void* (WINAPI*pf_wglGetProcAddress)(const char* symbol);
+
+typedef struct GLAPIResolver_Win32
+{
+	pf_wglGetProcAddress pwglGetProcAddress;
+	HMODULE hDLL;
+} GLAPIResolver_Win32;
+
+/*************************************************************************/
+
+void* openLibGL(const char* path)
+{
+	return (void*)LoadLibraryA(path);
+}
+
+/*************************************************************************/
+
+void closeLibGL(void* libGL)
+{
+	FreeLibrary((HMODULE)libGL);
+}
+
+/*************************************************************************/
+
+int getResolver(void* oglLib, GLAPIResolver* res)
+{
+	HMODULE hDLL = (HMODULE)oglLib;
+	GLAPIResolver_Win32* resolver = (GLAPIResolver_Win32*)res;
+
+	resolver->pwglGetProcAddress = (pf_wglGetProcAddress)GetProcAddress(hDLL, "wglGetProcAddress");
+	resolver->hDLL = hDLL;
+	
+	return (resolver->pwglGetProcAddress != NULL);
+}
+
+/*************************************************************************/
+
+/* Return default OpenGL library name for platform */
+const char* defaultLibGLName()
+{
+	return "opengl32.dll";
+}
+
+/*************************************************************************/
+
+void* resolveGLSymbol(const GLAPIResolver* res, const char* name)
+{
+	void* sym;
+	const GLAPIResolver_Win32* resolver = (const GLAPIResolver_Win32*)res;
+	
+	/* Try core (GL 1.1) symbol resolution first */
+	sym = (void*)GetProcAddress(resolver->hDLL, name);
+	
+	/* If that fails, try wglGetProcAddress() for extension GL stuff */
+	if(sym == NULL)
+		sym = resolver->pwglGetProcAddress(name);
+		
+	return sym;
+}
+
+/*************************************************************************/