diff --git a/src/gl/data/gl_viewpointbuffer.cpp b/src/gl/data/gl_viewpointbuffer.cpp
index 7af26ca52..eb4d8c92e 100644
--- a/src/gl/data/gl_viewpointbuffer.cpp
+++ b/src/gl/data/gl_viewpointbuffer.cpp
@@ -41,6 +41,7 @@ GLViewpointBuffer::GLViewpointBuffer()
 	Allocate();
 	Clear();
 	mLastMappedIndex = UINT_MAX;
+	mClipPlaneInfo.Push(0);
 }
 
 GLViewpointBuffer::~GLViewpointBuffer()
@@ -121,10 +122,9 @@ int GLViewpointBuffer::Bind(unsigned int index)
 		glBindBufferRange(GL_UNIFORM_BUFFER, VIEWPOINT_BINDINGPOINT, mBufferId, index * mBlockAlign, mBlockAlign);
 
 		// Update the viewpoint-related clip plane setting.
-		auto *vp = (HWViewpointUniforms*)(((char*)mBufferPointer) + mUploadIndex * mBlockAlign);
 		if (!(gl.flags & RFL_NO_CLIP_PLANES))
 		{
-			if (index > 0 && (vp->mClipHeightDirection != 0.f || vp->mClipLine.X > -10000000.0f))
+			if (mClipPlaneInfo[index])
 			{
 				glEnable(GL_CLIP_DISTANCE0);
 			}
@@ -163,6 +163,7 @@ int GLViewpointBuffer::SetViewpoint(HWViewpointUniforms *vp)
 	memcpy(((char*)mBufferPointer) + mUploadIndex * mBlockAlign, vp, sizeof(*vp));
 	Unmap();
 
+	mClipPlaneInfo.Push(vp->mClipHeightDirection != 0.f || vp->mClipLine.X > -10000000.0f);
 	return Bind(mUploadIndex++);
 }
 
@@ -170,5 +171,6 @@ void GLViewpointBuffer::Clear()
 {
 	// Index 0 is reserved for the 2D projection.
 	mUploadIndex = 1;
+	mClipPlaneInfo.Resize(1);
 }
 
diff --git a/src/gl/data/gl_viewpointbuffer.h b/src/gl/data/gl_viewpointbuffer.h
index 208a42a5d..3ec1093df 100644
--- a/src/gl/data/gl_viewpointbuffer.h
+++ b/src/gl/data/gl_viewpointbuffer.h
@@ -12,6 +12,7 @@ class GLViewpointBuffer
 	unsigned int mLastMappedIndex;
 	unsigned int mByteSize;
 	void * mBufferPointer;
+	TArray<bool> mClipPlaneInfo;
 	
 	unsigned int m2DWidth = ~0u, m2DHeight = ~0u;
 
diff --git a/src/posix/sdl/gl_sysfb.h b/src/posix/sdl/gl_sysfb.h
index ee2713bc5..44b92cf1a 100644
--- a/src/posix/sdl/gl_sysfb.h
+++ b/src/posix/sdl/gl_sysfb.h
@@ -52,11 +52,7 @@ protected:
 
 	static const int MIN_WIDTH = 320;
 	static const int MIN_HEIGHT = 200;
-
-	typedef DECLSPEC int SDLCALL (*SDL_GetWindowBordersSizePtr)(SDL_Window *, int *, int *, int *, int *);
-
-	SDL_GetWindowBordersSizePtr SDL_GetWindowBordersSize_;
-	void *sdl_lib;
 };
 
 #endif // __POSIX_SDL_GL_SYSFB_H__
+
diff --git a/src/posix/sdl/sdlglvideo.cpp b/src/posix/sdl/sdlglvideo.cpp
index 15c0e4944..b270fcdab 100644
--- a/src/posix/sdl/sdlglvideo.cpp
+++ b/src/posix/sdl/sdlglvideo.cpp
@@ -35,6 +35,7 @@
 
 #include "doomtype.h"
 
+#include "i_module.h"
 #include "i_system.h"
 #include "i_video.h"
 #include "m_argv.h"
@@ -172,6 +173,11 @@ IVideo *gl_CreateVideo()
 
 // FrameBuffer implementation -----------------------------------------------
 
+FModule sdl_lib("SDL2");
+
+typedef int (*SDL_GetWindowBordersSizePtr)(SDL_Window *, int *, int *, int *, int *);
+static TOptProc<sdl_lib, SDL_GetWindowBordersSizePtr> SDL_GetWindowBordersSize_("SDL_GetWindowBordersSize");
+
 SystemGLFrameBuffer::SystemGLFrameBuffer (void *, bool fullscreen)
 	: DFrameBuffer (vid_defwidth, vid_defheight)
 {
@@ -180,10 +186,9 @@ SystemGLFrameBuffer::SystemGLFrameBuffer (void *, bool fullscreen)
 	// SDL_GetWindowBorderSize() is only available since 2.0.5, but because
 	// GZDoom supports platforms with older SDL2 versions, this function
 	// has to be dynamically loaded
-	sdl_lib = SDL_LoadObject("libSDL2.so");
-	if (sdl_lib != nullptr)
+	if (!sdl_lib.IsLoaded())
 	{
-		SDL_GetWindowBordersSize_ = (SDL_GetWindowBordersSizePtr)SDL_LoadFunction(sdl_lib,"SDL_GetWindowBordersSize");
+		sdl_lib.Load({ "libSDL2.so", "libSDL2-2.0.so" });
 	}
 
 	// NOTE: Core profiles were added with GL 3.2, so there's no sense trying
@@ -261,11 +266,6 @@ SystemGLFrameBuffer::SystemGLFrameBuffer (void *, bool fullscreen)
 
 SystemGLFrameBuffer::~SystemGLFrameBuffer ()
 {
-	if (sdl_lib != nullptr)
-	{
-		SDL_UnloadObject(sdl_lib);
-	}
-
 	if (Screen)
 	{
 		ResetGammaTable();
@@ -391,7 +391,7 @@ void SystemGLFrameBuffer::SetWindowSize(int w, int h)
 
 void SystemGLFrameBuffer::GetWindowBordersSize(int &top, int &left)
 {
-	if (SDL_GetWindowBordersSize_ != nullptr)
+	if (SDL_GetWindowBordersSize_)
 	{
 		SDL_GetWindowBordersSize_(Screen, &top, &left, nullptr, nullptr);
 	}