--- a/render_sdl.c	Tue Dec 08 19:33:58 2015 -0800
+++ b/render_sdl.c	Mon Dec 14 19:36:01 2015 -0800
@@ -22,6 +22,8 @@
 SDL_Rect      main_clip;
 SDL_GLContext *main_context;
 
+int main_width, main_height;
+
 uint8_t render_dbg = 0;
 uint8_t debug_pal = 0;
 uint8_t render_gl = 1;
@@ -96,6 +98,16 @@
 	return num_joysticks;
 }
 
+int render_width()
+{
+	return main_width;
+}
+
+int render_height()
+{
+	return main_height;
+}
+
 uint32_t render_map_color(uint8_t r, uint8_t g, uint8_t b)
 {
 	return 255 << 24 | r << 16 | g << 8 | b;
@@ -251,6 +263,8 @@
 		width = mode.w;
 		height = mode.h;
 	}
+	main_width = width;
+	main_height = height;
 
 	render_gl = 0;