diff --git a/basegraph.cpp b/basegraph.cpp
index dbf274a3..b1586146 100644
--- a/basegraph.cpp
+++ b/basegraph.cpp
@@ -172,6 +172,8 @@ EX SDL_Renderer *s_renderer, *s_software_renderer;
 #endif
 EX SDL_Texture *s_texture;
 EX SDL_Window *s_window;
+EX SDL_GLContext s_context;
+EX bool s_have_context;
 #endif
 
 EX color_t qpixel_pixel_outside;
@@ -1148,6 +1150,9 @@ EX void close_renderer() {
 EX void close_window() {
   #if CAP_SDL2
   close_renderer();
+  if(s_have_context) {
+    SDL_GL_DeleteContext(s_context), s_have_context = false;
+    }
   if(s_window) SDL_DestroyWindow(s_window), s_window = nullptr;
   #endif
   }
@@ -1277,8 +1282,13 @@ EX void setvideomode() {
 
   auto create_win = [&] {
     #if CAP_SDL2
-    if(s_window && current_window_flags != (flags | sizeflag))
+    if(s_window && current_window_flags != (flags | sizeflag)) {
+      if(s_have_context) {
+        SDL_GL_DeleteContext(s_context), s_have_context = false;
+        glhr::glew = false;
+        }
       SDL_DestroyWindow(s_window), s_window = nullptr;
+      }
     if(s_window)
       SDL_SetWindowSize(s_window, vid.xres, vid.yres);
     else
@@ -1315,6 +1325,7 @@ EX void setvideomode() {
     }
   
   #if CAP_SDL2
+  if(s_renderer) SDL_DestroyRenderer(s_renderer), s_renderer = nullptr;
   s_renderer = SDL_CreateRenderer(s_window, -1, vid.current_vsync ? SDL_RENDERER_PRESENTVSYNC : 0);
   SDL_GetRendererOutputSize(s_renderer, &vid.xres, &vid.yres);
   
@@ -1341,6 +1352,12 @@ EX void setvideomode() {
       glDisable(GL_MULTISAMPLE_ARB);
       }
   
+    #if CAP_SDL2
+    if(s_have_context) SDL_GL_DeleteContext(s_context), s_have_context = false;
+    if(!s_have_context) s_context = SDL_GL_CreateContext(s_window);
+    s_have_context = true; glhr::glew = false;
+    #endif
+
     glViewport(0, 0, vid.xres, vid.yres);
     glhr::init();
     resetGL();
diff --git a/glhr.cpp b/glhr.cpp
index 433f46ca..70c409f8 100644
--- a/glhr.cpp
+++ b/glhr.cpp
@@ -153,7 +153,7 @@ struct glmatrix {
 
 #endif
 
-bool glew   = false;
+EX bool glew   = false;
 
 bool current_depthtest, current_depthwrite;
 ld fogbase;
@@ -697,6 +697,7 @@ void init() {
   #if CAP_GLEW
     if(!glew) { 
       glew = true; 
+      glewExperimental = GL_TRUE;
       printf("Initializing GLEW\n");
       GLenum err = glewInit();
       if (GLEW_OK != err) {