- initialize the GL backend in the proper place.

As long as there are still video mode switches this needs to be in the video mode switching function.

source/build/src/glsurface.cpp

@@ -67,7 +67,6 @@ bool glsurface_initialize(vec2_t bufferResolution)
 	bufferTexture = GLInterface.NewTexture();
 	bufferTexture->CreateTexture(bufferRes.x, bufferRes.y, true, false);
 
-	GLInterface.Init();
     glsurface_setPalette(curpalettefaded);
 
     const char* const VERTEX_SHADER_CODE =

source/build/src/polymost.cpp

@@ -794,8 +794,6 @@ void polymost_glinit()
     //glEnable(GL_LINE_SMOOTH);
 
 	globalflags |= GLOBAL_NO_GL_TILESHADES; // This re-enables the old fading logic without re-adding the r_usetileshades variable. The entire thing will have to be done on a more abstract level anyway.
-	GLInterface.Init();
-	GLInterface.mSamplers->SetTextureFilterMode(gltexfiltermode, glanisotropy);
 
 
 #ifdef USE_GLEXT

source/build/src/sdlayer.cpp

@@ -17,6 +17,7 @@
 #include "sdl_inc.h"
 #include "softsurface.h"
 #include "m_argv.h"
+#include "../../glbackend/glbackend.h"
 
 #ifdef USE_OPENGL
 # include "glad/glad.h"
@@ -569,11 +570,13 @@ int32_t videoSetVsync(int32_t newSync)
     else
 #endif
     {
+		/*
         vsync_renderlayer = newSync;
 
         videoResetMode();
         if (videoSetGameMode(fullscreen, xres, yres, bpp, upscalefactor))
             OSD_Printf("restartvid: Reset failed...\n");
+		*/
     }
 
     return newSync;
@@ -1395,6 +1398,11 @@ void sdlayer_setvideomode_opengl(void)
         glinfo.dumped = 1;
         bpp = oldbpp;
     }
+
+	GLInterface.Deinit();
+	GLInterface.Init();
+	GLInterface.mSamplers->SetTextureFilterMode(gltexfiltermode, glanisotropy);
+
 }
 #endif  // defined USE_OPENGL
 
@@ -1508,10 +1516,15 @@ void setrefreshrate(void)
     refreshfreq = error ? -1 : newmode.refresh_rate;
 }
 
+int called = 0;
 int32_t videoSetMode(int32_t x, int32_t y, int32_t c, int32_t fs)
 {
     int32_t regrab = 0, ret;
 
+	if (called++)
+	{
+		assert(0);
+	}
     ret = setvideomode_sdlcommon(&x, &y, c, fs, &regrab);
     if (ret != 1)
     {

source/glbackend/gl_samplers.cpp

@@ -75,7 +75,7 @@ FSamplerManager::~FSamplerManager()
 
 void FSamplerManager::UnbindAll()
 {
-	for (int i = 0; i < 8 /* fixme */; i++)
+	for (int i = 0; i < 16 /* fixme */; i++)
 	{
 		glBindSampler(i, 0);
 	}

source/glbackend/gl_samplers.h

@@ -25,6 +25,7 @@ class FSamplerManager
 	unsigned int mSamplers[NumSamplers];
 
 	void UnbindAll();
+	void CreateSamplers();
 
 public:
 

source/glbackend/glbackend.cpp

@@ -2,6 +2,7 @@
 #include "glad/glad.h"
 #include "gl_samplers.h"
 
+
 GLInstance GLInterface;
 
 void GLInstance::Init()
@@ -16,6 +17,7 @@ void GLInstance::Init()
 void GLInstance::Deinit()
 {
 	if (mSamplers) delete mSamplers;
+	mSamplers = nullptr;
 }
 	
 std::pair<size_t, BaseVertex *> GLInstance::AllocVertices(size_t num)