- set up dynamic opengl load for windows

src/CMakeLists.txt

@@ -101,7 +101,6 @@ if( WIN32 )
 	endif()
 
 	set( ZDOOM_LIBS
-		opengl32
 		wsock32
 		winmm
 		"${DX_dinput8_LIBRARY}"

src/common/platform/win32/gl_sysfb.cpp

@@ -52,6 +52,8 @@
 
 extern HWND			Window;
 
+extern "C" PROC zd_wglGetProcAddress(LPCSTR name);
+
 PFNWGLSWAPINTERVALEXTPROC myWglSwapIntervalExtProc;
 
 //==========================================================================
@@ -78,15 +80,15 @@ SystemGLFrameBuffer::SystemGLFrameBuffer(void *hMonitor, bool fullscreen) : Syst
 	HDC hDC = GetDC(Window);
 	const char *wglext = nullptr;
 
-	myWglSwapIntervalExtProc = (PFNWGLSWAPINTERVALEXTPROC)wglGetProcAddress("wglSwapIntervalEXT");
+	myWglSwapIntervalExtProc = (PFNWGLSWAPINTERVALEXTPROC)zd_wglGetProcAddress("wglSwapIntervalEXT");
-	auto myWglGetExtensionsStringARB = (PFNWGLGETEXTENSIONSSTRINGARBPROC)wglGetProcAddress("wglGetExtensionsStringARB");
+	auto myWglGetExtensionsStringARB = (PFNWGLGETEXTENSIONSSTRINGARBPROC)zd_wglGetProcAddress("wglGetExtensionsStringARB");
 	if (myWglGetExtensionsStringARB)
 	{
 		wglext = myWglGetExtensionsStringARB(hDC);
 	}
 	else
 	{
-		auto myWglGetExtensionsStringEXT = (PFNWGLGETEXTENSIONSSTRINGEXTPROC)wglGetProcAddress("wglGetExtensionsStringEXT");
+		auto myWglGetExtensionsStringEXT = (PFNWGLGETEXTENSIONSSTRINGEXTPROC)zd_wglGetProcAddress("wglGetExtensionsStringEXT");
 		if (myWglGetExtensionsStringEXT)
 		{
 			wglext = myWglGetExtensionsStringEXT();

src/common/platform/win32/win32glvideo.cpp

@@ -55,6 +55,13 @@
 
 #include "gl_framebuffer.h"
 
+extern "C" {
+HGLRC zd_wglCreateContext(HDC Arg1);
+BOOL zd_wglDeleteContext(HGLRC Arg1);
+BOOL zd_wglMakeCurrent(HDC Arg1, HGLRC Arg2);
+PROC zd_wglGetProcAddress(LPCSTR name);
+}
+
 EXTERN_CVAR(Int, vid_adapter)
 EXTERN_CVAR(Bool, vid_hdr)
 
@@ -74,7 +81,7 @@ CUSTOM_CVAR(Bool, vr_enable_quadbuffered, false, CVAR_ARCHIVE | CVAR_GLOBALCONFI
 extern bool vid_hdr_active;
 
 // these get used before GLEW is initialized so we have to use separate pointers with different names
-PFNWGLCHOOSEPIXELFORMATARBPROC myWglChoosePixelFormatARB; // = (PFNWGLCHOOSEPIXELFORMATARBPROC)wglGetProcAddress("wglChoosePixelFormatARB");
+PFNWGLCHOOSEPIXELFORMATARBPROC myWglChoosePixelFormatARB; // = (PFNWGLCHOOSEPIXELFORMATARBPROC)zd_wglGetProcAddress("wglChoosePixelFormatARB");
 PFNWGLCREATECONTEXTATTRIBSARBPROC myWglCreateContextAttribsARB;
 
 
@@ -224,15 +231,15 @@ bool Win32GLVideo::SetPixelFormat()
 
 	::SetPixelFormat(hDC, pixelFormat, &pfd);
 
-	hRC = wglCreateContext(hDC);
+	hRC = zd_wglCreateContext(hDC);
-	wglMakeCurrent(hDC, hRC);
+	zd_wglMakeCurrent(hDC, hRC);
 
-	myWglChoosePixelFormatARB = (PFNWGLCHOOSEPIXELFORMATARBPROC)wglGetProcAddress("wglChoosePixelFormatARB");
+	myWglChoosePixelFormatARB = (PFNWGLCHOOSEPIXELFORMATARBPROC)zd_wglGetProcAddress("wglChoosePixelFormatARB");
-	myWglCreateContextAttribsARB = (PFNWGLCREATECONTEXTATTRIBSARBPROC)wglGetProcAddress("wglCreateContextAttribsARB");
+	myWglCreateContextAttribsARB = (PFNWGLCREATECONTEXTATTRIBSARBPROC)zd_wglGetProcAddress("wglCreateContextAttribsARB");
 	// any extra stuff here?
 
-	wglMakeCurrent(NULL, NULL);
+	zd_wglMakeCurrent(NULL, NULL);
-	wglDeleteContext(hRC);
+	zd_wglDeleteContext(hRC);
 	ReleaseDC(dummy, hDC);
 	ShutdownDummy(dummy);
 
@@ -436,7 +443,7 @@ bool Win32GLVideo::InitHardware(HWND Window, int multisample)
 
 		if (m_hRC == NULL && prof == WGL_CONTEXT_COMPATIBILITY_PROFILE_BIT_ARB)
 		{
-			m_hRC = wglCreateContext(m_hDC);
+			m_hRC = zd_wglCreateContext(m_hDC);
 			if (m_hRC == NULL)
 			{
 				I_Error("R_OPENGL: Unable to create an OpenGL render context.\n");
@@ -446,7 +453,7 @@ bool Win32GLVideo::InitHardware(HWND Window, int multisample)
 
 		if (m_hRC != NULL)
 		{
-			wglMakeCurrent(m_hDC, m_hRC);
+			zd_wglMakeCurrent(m_hDC, m_hRC);
 			return true;
 		}
 	}
@@ -465,8 +472,8 @@ void Win32GLVideo::Shutdown()
 {
 	if (m_hRC)
 	{
-		wglMakeCurrent(0, 0);
+		zd_wglMakeCurrent(0, 0);
-		wglDeleteContext(m_hRC);
+		zd_wglDeleteContext(m_hRC);
 	}
 	if (m_hDC) ReleaseDC(m_Window, m_hDC);
 }

src/common/rendering/gl_load/gl_load.c

@@ -67,10 +67,51 @@ static int TestPointer(const PROC pTest)
 	return 1;
 }
 
+static HMODULE opengl32dll;
+static HGLRC(WINAPI* createcontext)(HDC);
+static BOOL(WINAPI* deletecontext)(HGLRC);
+static BOOL(WINAPI* makecurrent)(HDC, HGLRC);
+static PROC(WINAPI* getprocaddress)(LPCSTR name);
+static void CheckOpenGL(void)
+{
+    if (opengl32dll == 0)
+    {
+        opengl32dll = LoadLibrary(L"OpenGL32.DLL");
+        createcontext = (HGLRC(WINAPI*)(HDC)) GetProcAddress(opengl32dll, "wglCreateContext");
+        deletecontext = (BOOL(WINAPI*)(HGLRC)) GetProcAddress(opengl32dll, "wglDeleteContext");
+        makecurrent = (BOOL(WINAPI*)(HDC, HGLRC)) GetProcAddress(opengl32dll, "wglMakeCurrent");
+        getprocaddress = (PROC(WINAPI*)(LPCSTR)) GetProcAddress(opengl32dll, "wglGetProcAddress");
+    }
+}
+
+HGLRC zd_wglCreateContext(HDC dc)
+{
+    CheckOpenGL();
+    return createcontext(dc);
+}
+
+BOOL zd_wglDeleteContext(HGLRC context)
+{
+    CheckOpenGL();
+    return deletecontext(context);
+}
+
+BOOL zd_wglMakeCurrent(HDC dc, HGLRC context)
+{
+    CheckOpenGL();
+    return makecurrent(dc, context);
+}
+
+PROC zd_wglGetProcAddress(LPCSTR name)
+{
+    CheckOpenGL();
+    return getprocaddress(name);
+}
+
 static PROC WinGetProcAddress(const char *name)
 {
 	HMODULE glMod = NULL;
-	PROC pFunc = wglGetProcAddress((LPCSTR)name);
+	PROC pFunc = zd_wglGetProcAddress((LPCSTR)name);
 	if(TestPointer(pFunc))
 	{
 		return pFunc;