DOOM: Changed SCREENWIDTH/SCREENHEIGHT to be variables

Performance impact to be verified but I don't think there will be any.

launcher/main/CREDITS

@@ -1,4 +1,4 @@
-Alex Duchesne <alex@netvps.ca>
+Alex Duchesne (ducalex)
 - Author and maintainer
 
 Pelle7 / Go-Emu

prboom-go/components/prboom/doomdef.c

@@ -41,4 +41,5 @@
 
 // Location for any defines turned variables.
 // None.
-
+int SCREENWIDTH = 320;
+int SCREENHEIGHT = 240;

prboom-go/components/prboom/doomdef.h

@@ -40,15 +40,6 @@
 #include "config.h"
 #endif
 
-#ifdef RETRO_GO
-#include <rg_system.h>
-#define SCREENWIDTH  (RG_SCREEN_WIDTH - RG_SCREEN_MARGIN_LEFT - RG_SCREEN_MARGIN_RIGHT)
-#define SCREENHEIGHT (RG_SCREEN_HEIGHT - RG_SCREEN_MARGIN_TOP - RG_SCREEN_MARGIN_BOTTOM)
-#else
-#define SCREENWIDTH  320
-#define SCREENHEIGHT 240
-#endif
-
 // This must come first, since it redefines malloc(), free(), etc. -- killough:
 #include "z_zone.h"
 
@@ -85,8 +76,14 @@ typedef enum {
 // when multiple screen sizes are supported
 
 // proff 08/17/98: Changed for high-res
-#define MAX_SCREENWIDTH  SCREENWIDTH
-#define MAX_SCREENHEIGHT SCREENHEIGHT
+#define MAX_SCREENWIDTH  320
+#define MAX_SCREENHEIGHT 240
+
+// SCREENWIDTH and SCREENHEIGHT define the visible size
+// #define SCREENWIDTH 320
+// #define SCREENHEIGHT 240
+extern int SCREENWIDTH;
+extern int SCREENHEIGHT;
 
 // The maximum number of players, multiplayer/networking.
 #define MAXPLAYERS       4

prboom-go/components/prboom/lprintf.c

@@ -37,6 +37,10 @@
 #include "config.h"
 #endif
 
+#ifdef RETRO_GO
+#include <rg_system.h>
+#endif
+
 #include <stdio.h>
 #include <stdlib.h>
 #include <stdarg.h>

prboom-go/main/main.c

@@ -532,6 +532,10 @@ void app_main()
     app = rg_system_init(AUDIO_SAMPLE_RATE, &handlers, options);
     app->tickRate = TICRATE;
 
+    const rg_display_t *display = rg_display_get_info();
+    SCREENWIDTH = RG_MIN(display->screen.width, MAX_SCREENWIDTH);
+    SCREENHEIGHT = RG_MIN(display->screen.height, MAX_SCREENHEIGHT);
+
     update = rg_surface_create(SCREENWIDTH, SCREENHEIGHT, RG_PIXEL_PAL565_BE, MEM_FAST);
 
     const char *save = RG_BASE_PATH_SAVES "/doom";