From 9cc8b3320afa38e37682cfecd60c8acc0ecabfd6 Mon Sep 17 00:00:00 2001
From: Lior Halphon <LIJI32@gmail.com>
Date: Wed, 4 Oct 2017 12:43:31 +0300
Subject: [PATCH] Starting to add a GUI to the SDL port

---
 Makefile           |   4 +-
 SDL/background.bmp | Bin 0 -> 11592 bytes
 SDL/drop.bmp       | Bin 69176 -> 0 bytes
 SDL/font.c         | 956 +++++++++++++++++++++++++++++++++++++++++++++
 SDL/font.h         |   9 +
 SDL/gui.c          | 213 ++++++++++
 SDL/gui.h          |  25 ++
 SDL/main.c         | 148 +------
 8 files changed, 1218 insertions(+), 137 deletions(-)
 create mode 100644 SDL/background.bmp
 delete mode 100644 SDL/drop.bmp
 create mode 100644 SDL/font.c
 create mode 100644 SDL/font.h
 create mode 100644 SDL/gui.c
 create mode 100644 SDL/gui.h

diff --git a/Makefile b/Makefile
index c185cf9..fcde67e 100755
--- a/Makefile
+++ b/Makefile
@@ -88,7 +88,7 @@ endif
 
 cocoa: $(BIN)/SameBoy.app
 quicklook: $(BIN)/SameBoy.qlgenerator
-sdl: $(SDL_TARGET) $(BIN)/SDL/dmg_boot.bin $(BIN)/SDL/cgb_boot.bin $(BIN)/SDL/LICENSE $(BIN)/SDL/registers.sym $(BIN)/SDL/drop.bmp
+sdl: $(SDL_TARGET) $(BIN)/SDL/dmg_boot.bin $(BIN)/SDL/cgb_boot.bin $(BIN)/SDL/LICENSE $(BIN)/SDL/registers.sym $(BIN)/SDL/background.bmp
 bootroms: $(BIN)/BootROMs/cgb_boot.bin $(BIN)/BootROMs/dmg_boot.bin
 tester: $(TESTER_TARGET) $(BIN)/tester/dmg_boot.bin $(BIN)/tester/cgb_boot.bin
 all: cocoa sdl tester
@@ -267,7 +267,7 @@ $(BIN)/SDL/LICENSE: LICENSE
 $(BIN)/SDL/registers.sym: Misc/registers.sym
 	cp -f $^ $@
 	
-$(BIN)/SDL/drop.bmp: SDL/drop.bmp
+$(BIN)/SDL/background.bmp: SDL/background.bmp
 	cp -f $^ $@
 
 # Boot ROMs
diff --git a/SDL/background.bmp b/SDL/background.bmp
new file mode 100644
index 0000000000000000000000000000000000000000..4624cb2395bcfab8eba53aea3be99868f0fb6ab0
GIT binary patch
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literal 0
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diff --git a/SDL/drop.bmp b/SDL/drop.bmp
deleted file mode 100644
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GIT binary patch
literal 0
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diff --git a/SDL/font.c b/SDL/font.c
new file mode 100644
index 0000000..fe6bbe7
--- /dev/null
+++ b/SDL/font.c
@@ -0,0 +1,956 @@
+#include "font.h"
+
+#define _ 0
+#define X 1
+
+uint8_t font[] = {
+    /*   */
+    _, _, _, _, _, _ ,
+    _, _, _, _, _, _ ,
+    _, _, _, _, _, _ ,
+    _, _, _, _, _, _ ,
+    _, _, _, _, _, _ ,
+    _, _, _, _, _, _ ,
+    _, _, _, _, _, _ ,
+    _, _, _, _, _, _ ,
+    
+    /* ! */
+    _, _, X, _, _, _ ,
+    _, _, X, _, _, _ ,
+    _, _, X, _, _, _ ,
+    _, _, X, _, _, _ ,
+    _, _, _, _, _, _ ,
+    _, _, _, _, _, _ ,
+    _, _, X, _, _, _ ,
+    _, _, _, _, _, _ ,
+    
+    /* " */
+    X, X, _, X, X, _ ,
+    _, X, _, X, _, _ ,
+    _, X, _, X, _, _ ,
+    _, _, _, _, _, _ ,
+    _, _, _, _, _, _ ,
+    _, _, _, _, _, _ ,
+    _, _, _, _, _, _ ,
+    _, _, _, _, _, _ ,
+    
+    /* # */
+    _, X, _, X, _, _ ,
+    _, X, _, X, _, _ ,
+    X, X, X, X, X, _ ,
+    _, X, _, X, _, _ ,
+    X, X, X, X, X, _ ,
+    _, X, _, X, _, _ ,
+    _, X, _, X, _, _ ,
+    _, _, _, _, _, _ ,
+    
+    /* $ */
+    _, _, X, _, _, _ ,
+    _, X, X, X, _, _ ,
+    X, _, X, _, X, _ ,
+    _, X, X, _, _, _ ,
+    _, _, X, X, _, _ ,
+    X, _, X, _, X, _ ,
+    _, X, X, X, _, _ ,
+    _, _, X, _, _, _ ,
+    
+    /* % */
+    _, _, _, _, _, _ ,
+    X, X, _, _, _, X ,
+    X, X, _, _, X, _ ,
+    _, _, _, X, _, _ ,
+    _, _, X, _, _, _ ,
+    _, X, _, _, X, X ,
+    X, _, _, _, X, X ,
+    _, _, _, _, _, _ ,
+    
+    /* & */
+    _, X, X, _, _, _ ,
+    X, _, _, X, _, _ ,
+    X, _, _, X, _, _ ,
+    _, X, X, _, X, _ ,
+    X, _, _, X, _, _ ,
+    X, _, _, X, _, _ ,
+    _, X, X, _, X, _ ,
+    _, _, _, _, _, _ ,
+    
+    /* ' */
+    _, _, X, _, _, _ ,
+    _, _, X, _, _, _ ,
+    _, _, X, _, _, _ ,
+    _, _, _, _, _, _ ,
+    _, _, _, _, _, _ ,
+    _, _, _, _, _, _ ,
+    _, _, _, _, _, _ ,
+    _, _, _, _, _, _ ,
+    
+    /* ( */
+    _, _, _, X, _, _ ,
+    _, _, X, _, _, _ ,
+    _, X, _, _, _, _ ,
+    _, X, _, _, _, _ ,
+    _, X, _, _, _, _ ,
+    _, X, _, _, _, _ ,
+    _, _, X, _, _, _ ,
+    _, _, _, X, _, _ ,
+    
+    /* ) */
+    _, X, _, _, _, _ ,
+    _, _, X, _, _, _ ,
+    _, _, _, X, _, _ ,
+    _, _, _, X, _, _ ,
+    _, _, _, X, _, _ ,
+    _, _, _, X, _, _ ,
+    _, _, X, _, _, _ ,
+    _, X, _, _, _, _ ,
+    
+    /* * */
+    _, _, _, _, _, _ ,
+    _, _, X, _, _, _ ,
+    X, _, X, _, X, _ ,
+    _, X, X, X, _, _ ,
+    X, _, X, _, X, _ ,
+    _, _, X, _, _, _ ,
+    _, _, _, _, _, _ ,
+    _, _, _, _, _, _ ,
+    
+    /* + */
+    _, _, _, _, _, _ ,
+    _, _, _, _, _, _ ,
+    _, _, X, _, _, _ ,
+    _, _, X, _, _, _ ,
+    X, X, X, X, X, _ ,
+    _, _, X, _, _, _ ,
+    _, _, X, _, _, _ ,
+    _, _, _, _, _, _ ,
+    
+    /* , */
+    _, _, _, _, _, _ ,
+    _, _, _, _, _, _ ,
+    _, _, _, _, _, _ ,
+    _, _, _, _, _, _ ,
+    _, _, _, _, _, _ ,
+    _, _, X, _, _, _ ,
+    _, _, X, _, _, _ ,
+    _, X, _, _, _, _ ,
+    
+    /* - */
+    _, _, _, _, _, _ ,
+    _, _, _, _, _, _ ,
+    _, _, _, _, _, _ ,
+    _, _, _, _, _, _ ,
+    X, X, X, X, X, _ ,
+    _, _, _, _, _, _ ,
+    _, _, _, _, _, _ ,
+    _, _, _, _, _, _ ,
+    
+    /* . */
+    _, _, _, _, _, _ ,
+    _, _, _, _, _, _ ,
+    _, _, _, _, _, _ ,
+    _, _, _, _, _, _ ,
+    _, _, _, _, _, _ ,
+    _, _, _, _, _, _ ,
+    _, _, X, _, _, _ ,
+    _, _, _, _, _, _ ,
+    
+    /* / */
+    _, _, _, _, X, _ ,
+    _, _, _, _, X, _ ,
+    _, _, _, X, _, _ ,
+    _, _, _, X, _, _ ,
+    _, _, X, _, _, _ ,
+    _, _, X, _, _, _ ,
+    _, X, _, _, _, _ ,
+    _, X, _, _, _, _ ,
+    
+    /* 0 */
+    _, X, X, X, _, _ ,
+    X, _, _, _, X, _ ,
+    X, _, _, _, X, _ ,
+    X, _, _, _, X, _ ,
+    X, _, _, _, X, _ ,
+    X, _, _, _, X, _ ,
+    _, X, X, X, _, _ ,
+    _, _, _, _, _, _ ,
+    
+    /* 1 */
+    _, _, X, _, _, _ ,
+    X, X, X, _, _, _ ,
+    _, _, X, _, _, _ ,
+    _, _, X, _, _, _ ,
+    _, _, X, _, _, _ ,
+    _, _, X, _, _, _ ,
+    X, X, X, X, X, _ ,
+    _, _, _, _, _, _ ,
+    
+    /* 2 */
+    _, X, X, X, _, _ ,
+    X, _, _, _, X, _ ,
+    _, _, _, _, X, _ ,
+    _, _, X, X, _, _ ,
+    _, X, _, _, _, _ ,
+    X, _, _, _, _, _ ,
+    X, X, X, X, X, _ ,
+    _, _, _, _, _, _ ,
+    
+    /* 3 */
+    _, X, X, X, _, _ ,
+    X, _, _, _, X, _ ,
+    _, _, _, _, X, _ ,
+    _, _, X, X, _, _ ,
+    _, _, _, _, X, _ ,
+    X, _, _, _, X, _ ,
+    _, X, X, X, _, _ ,
+    _, _, _, _, _, _ ,
+    
+    /* 4 */
+    _, _, _, X, _, _ ,
+    _, _, X, X, _, _ ,
+    _, X, _, X, _, _ ,
+    X, _, _, X, _, _ ,
+    X, X, X, X, X, _ ,
+    _, _, _, X, _, _ ,
+    _, _, _, X, _, _ ,
+    _, _, _, _, _, _ ,
+    
+    /* 5 */
+    X, X, X, X, X, _ ,
+    X, _, _, _, _, _ ,
+    X, _, _, _, _, _ ,
+    X, X, X, X, _, _ ,
+    _, _, _, _, X, _ ,
+    X, _, _, _, X, _ ,
+    _, X, X, X, _, _ ,
+    _, _, _, _, _, _ ,
+    
+    /* 6 */
+    _, X, X, X, _, _ ,
+    X, _, _, _, X, _ ,
+    X, _, _, _, _, _ ,
+    X, X, X, X, _, _ ,
+    X, _, _, _, X, _ ,
+    X, _, _, _, X, _ ,
+    _, X, X, X, _, _ ,
+    _, _, _, _, _, _ ,
+    
+    /* 7 */
+    X, X, X, X, X, _ ,
+    _, _, _, _, X, _ ,
+    _, _, _, X, _, _ ,
+    _, _, _, X, _, _ ,
+    _, _, X, _, _, _ ,
+    _, _, X, _, _, _ ,
+    _, _, X, _, _, _ ,
+    _, _, _, _, _, _ ,
+    
+    /* 8 */
+    _, X, X, X, _, _ ,
+    X, _, _, _, X, _ ,
+    X, _, _, _, X, _ ,
+    _, X, X, X, _, _ ,
+    X, _, _, _, X, _ ,
+    X, _, _, _, X, _ ,
+    _, X, X, X, _, _ ,
+    _, _, _, _, _, _ ,
+    
+    /* 9 */
+    _, X, X, X, _, _ ,
+    X, _, _, _, X, _ ,
+    X, _, _, _, X, _ ,
+    _, X, X, X, X, _ ,
+    _, _, _, _, X, _ ,
+    X, _, _, _, X, _ ,
+    _, X, X, X, _, _ ,
+    _, _, _, _, _, _ ,
+    
+    /* : */
+    _, _, _, _, _, _ ,
+    _, _, _, _, _, _ ,
+    _, _, X, _, _, _ ,
+    _, _, _, _, _, _ ,
+    _, _, _, _, _, _ ,
+    _, _, _, _, _, _ ,
+    _, _, X, _, _, _ ,
+    _, _, _, _, _, _ ,
+    
+    /* ; */
+    _, _, _, _, _, _ ,
+    _, _, _, _, _, _ ,
+    _, _, X, _, _, _ ,
+    _, _, _, _, _, _ ,
+    _, _, _, _, _, _ ,
+    _, _, X, _, _, _ ,
+    _, _, X, _, _, _ ,
+    _, X, _, _, _, _ ,
+    
+    /* < */
+    _, _, _, _, _, _ ,
+    _, _, _, _, X, _ ,
+    _, _, X, X, _, _ ,
+    X, X, _, _, _, _ ,
+    X, X, _, _, _, _ ,
+    _, _, X, X, _, _ ,
+    _, _, _, _, X, _ ,
+    _, _, _, _, _, _ ,
+    
+    /* = */
+    _, _, _, _, _, _ ,
+    _, _, _, _, _, _ ,
+    _, _, _, _, _, _ ,
+    X, X, X, X, X, _ ,
+    _, _, _, _, _, _ ,
+    X, X, X, X, X, _ ,
+    _, _, _, _, _, _ ,
+    _, _, _, _, _, _ ,
+    
+    /* > */
+    _, _, _, _, _, _ ,
+    X, _, _, _, _, _ ,
+    _, X, X, _, _, _ ,
+    _, _, _, X, X, _ ,
+    _, _, _, X, X, _ ,
+    _, X, X, _, _, _ ,
+    X, _, _, _, _, _ ,
+    _, _, _, _, _, _ ,
+    
+    /* ? */
+    _, X, X, X, _, _ ,
+    X, _, _, _, X, _ ,
+    _, _, _, _, X, _ ,
+    _, _, X, X, _, _ ,
+    _, _, X, _, _, _ ,
+    _, _, _, _, _, _ ,
+    _, _, X, _, _, _ ,
+    _, _, _, _, _, _ ,
+    
+    /* @ */
+    _, X, X, X, _, _ ,
+    X, _, _, _, X, _ ,
+    X, _, _, X, X, _ ,
+    X, _, X, _, X, _ ,
+    X, _, X, _, X, _ ,
+    X, _, _, X, X, _ ,
+    X, _, _, _, _, _ ,
+    _, X, X, X, X, _ ,
+    
+    /* A */
+    _, _, X, _, _, _ ,
+    _, _, X, _, _, _ ,
+    _, X, _, X, _, _ ,
+    _, X, _, X, _, _ ,
+    _, X, X, X, _, _ ,
+    X, _, _, _, X, _ ,
+    X, _, _, _, X, _ ,
+    _, _, _, _, _, _ ,
+    
+    /* B */
+    X, X, X, X, _, _ ,
+    X, _, _, _, X, _ ,
+    X, _, _, _, X, _ ,
+    X, X, X, X, _, _ ,
+    X, _, _, _, X, _ ,
+    X, _, _, _, X, _ ,
+    X, X, X, X, _, _ ,
+    _, _, _, _, _, _ ,
+    
+    /* C */
+    _, X, X, X, _, _ ,
+    X, _, _, _, X, _ ,
+    X, _, _, _, _, _ ,
+    X, _, _, _, _, _ ,
+    X, _, _, _, _, _ ,
+    X, _, _, _, X, _ ,
+    _, X, X, X, _, _ ,
+    _, _, _, _, _, _ ,
+    
+    /* D */
+    X, X, X, X, _, _ ,
+    X, _, _, _, X, _ ,
+    X, _, _, _, X, _ ,
+    X, _, _, _, X, _ ,
+    X, _, _, _, X, _ ,
+    X, _, _, _, X, _ ,
+    X, X, X, X, _, _ ,
+    _, _, _, _, _, _ ,
+    
+    /* E */
+    X, X, X, X, X, _ ,
+    X, _, _, _, _, _ ,
+    X, _, _, _, _, _ ,
+    X, X, X, X, _, _ ,
+    X, _, _, _, _, _ ,
+    X, _, _, _, _, _ ,
+    X, X, X, X, X, _ ,
+    _, _, _, _, _, _ ,
+    
+    /* F */
+    X, X, X, X, X, _ ,
+    X, _, _, _, _, _ ,
+    X, _, _, _, _, _ ,
+    X, _, _, _, _, _ ,
+    X, X, X, X, _, _ ,
+    X, _, _, _, _, _ ,
+    X, _, _, _, _, _ ,
+    _, _, _, _, _, _ ,
+    
+    /* G */
+    _, X, X, X, _, _ ,
+    X, _, _, _, X, _ ,
+    X, _, _, _, _, _ ,
+    X, _, X, X, X, _ ,
+    X, _, _, _, X, _ ,
+    X, _, _, _, X, _ ,
+    _, X, X, X, _, _ ,
+    _, _, _, _, _, _ ,
+    
+    /* H */
+    X, _, _, _, X, _ ,
+    X, _, _, _, X, _ ,
+    X, _, _, _, X, _ ,
+    X, X, X, X, X, _ ,
+    X, _, _, _, X, _ ,
+    X, _, _, _, X, _ ,
+    X, _, _, _, X, _ ,
+    _, _, _, _, _, _ ,
+    
+    /* I */
+    X, X, X, X, X, _ ,
+    _, _, X, _, _, _ ,
+    _, _, X, _, _, _ ,
+    _, _, X, _, _, _ ,
+    _, _, X, _, _, _ ,
+    _, _, X, _, _, _ ,
+    X, X, X, X, X, _ ,
+    _, _, _, _, _, _ ,
+    
+    /* J */
+    _, _, X, X, X, _ ,
+    _, _, _, _, X, _ ,
+    _, _, _, _, X, _ ,
+    _, _, _, _, X, _ ,
+    _, _, _, _, X, _ ,
+    X, _, _, _, X, _ ,
+    _, X, X, X, _, _ ,
+    _, _, _, _, _, _ ,
+    
+    /* K */
+    X, _, _, _, X, _ ,
+    X, _, _, X, _, _ ,
+    X, _, X, _, _, _ ,
+    X, X, _, _, _, _ ,
+    X, _, X, _, _, _ ,
+    X, _, _, X, _, _ ,
+    X, _, _, _, X, _ ,
+    _, _, _, _, _, _ ,
+    
+    /* L */
+    X, _, _, _, _, _ ,
+    X, _, _, _, _, _ ,
+    X, _, _, _, _, _ ,
+    X, _, _, _, _, _ ,
+    X, _, _, _, _, _ ,
+    X, _, _, _, _, _ ,
+    X, X, X, X, X, _ ,
+    _, _, _, _, _, _ ,
+    
+    /* M */
+    X, _, _, _, X, _ ,
+    X, X, _, X, X, _ ,
+    X, X, _, X, X, _ ,
+    X, _, X, _, X, _ ,
+    X, _, X, _, X, _ ,
+    X, _, _, _, X, _ ,
+    X, _, _, _, X, _ ,
+    _, _, _, _, _, _ ,
+    
+    /* N */
+    X, _, _, _, X, _ ,
+    X, X, _, _, X, _ ,
+    X, _, X, _, X, _ ,
+    X, _, X, _, X, _ ,
+    X, _, X, _, X, _ ,
+    X, _, _, X, X, _ ,
+    X, _, _, _, X, _ ,
+    _, _, _, _, _, _ ,
+    
+    /* O */
+    _, X, X, X, _, _ ,
+    X, _, _, _, X, _ ,
+    X, _, _, _, X, _ ,
+    X, _, _, _, X, _ ,
+    X, _, _, _, X, _ ,
+    X, _, _, _, X, _ ,
+    _, X, X, X, _, _ ,
+    _, _, _, _, _, _ ,
+    
+    /* P */
+    X, X, X, X, _, _ ,
+    X, _, _, _, X, _ ,
+    X, _, _, _, X, _ ,
+    X, _, _, _, X, _ ,
+    X, X, X, X, _, _ ,
+    X, _, _, _, _, _ ,
+    X, _, _, _, _, _ ,
+    _, _, _, _, _, _ ,
+    
+    /* Q */
+    _, X, X, X, _, _ ,
+    X, _, _, _, X, _ ,
+    X, _, _, _, X, _ ,
+    X, _, _, _, X, _ ,
+    X, _, _, _, X, _ ,
+    X, _, X, _, X, _ ,
+    _, X, X, X, _, _ ,
+    _, _, _, _, X, X ,
+    
+    /* R */
+    X, X, X, X, _, _ ,
+    X, _, _, _, X, _ ,
+    X, _, _, _, X, _ ,
+    X, X, X, X, _, _ ,
+    X, _, X, _, _, _ ,
+    X, _, _, X, _, _ ,
+    X, _, _, _, X, _ ,
+    _, _, _, _, _, _ ,
+    
+    /* S */
+    _, X, X, X, _, _ ,
+    X, _, _, _, X, _ ,
+    X, _, _, _, _, _ ,
+    _, X, X, X, _, _ ,
+    _, _, _, _, X, _ ,
+    X, _, _, _, X, _ ,
+    _, X, X, X, _, _ ,
+    _, _, _, _, _, _ ,
+    
+    /* T */
+    X, X, X, X, X, _ ,
+    _, _, X, _, _, _ ,
+    _, _, X, _, _, _ ,
+    _, _, X, _, _, _ ,
+    _, _, X, _, _, _ ,
+    _, _, X, _, _, _ ,
+    _, _, X, _, _, _ ,
+    _, _, _, _, _, _ ,
+    
+    /* U */
+    X, _, _, _, X, _ ,
+    X, _, _, _, X, _ ,
+    X, _, _, _, X, _ ,
+    X, _, _, _, X, _ ,
+    X, _, _, _, X, _ ,
+    X, _, _, _, X, _ ,
+    _, X, X, X, _, _ ,
+    _, _, _, _, _, _ ,
+    
+    /* V */
+    X, _, _, _, X, _ ,
+    X, _, _, _, X, _ ,
+    X, _, _, _, X, _ ,
+    _, X, _, X, _, _ ,
+    _, X, _, X, _, _ ,
+    _, _, X, _, _, _ ,
+    _, _, X, _, _, _ ,
+    _, _, _, _, _, _ ,
+    
+    /* W */
+    X, _, _, _, X, _ ,
+    X, _, _, _, X, _ ,
+    X, _, X, _, X, _ ,
+    X, _, X, _, X, _ ,
+    X, X, _, X, X, _ ,
+    X, X, _, X, X, _ ,
+    X, _, _, _, X, _ ,
+    _, _, _, _, _, _ ,
+    
+    /* X */
+    X, _, _, _, X, _ ,
+    _, X, _, X, _, _ ,
+    _, X, _, X, _, _ ,
+    _, _, X, _, _, _ ,
+    _, X, _, X, _, _ ,
+    _, X, _, X, _, _ ,
+    X, _, _, _, X, _ ,
+    _, _, _, _, _, _ ,
+    
+    /* Y */
+    X, _, _, _, X, _ ,
+    X, _, _, _, X, _ ,
+    _, X, _, X, _, _ ,
+    _, _, X, _, _, _ ,
+    _, _, X, _, _, _ ,
+    _, _, X, _, _, _ ,
+    _, _, X, _, _, _ ,
+    _, _, _, _, _, _ ,
+    
+    /* Z */
+    X, X, X, X, X, _ ,
+    _, _, _, _, X, _ ,
+    _, _, _, X, _, _ ,
+    _, _, X, _, _, _ ,
+    _, X, _, _, _, _ ,
+    X, _, _, _, _, _ ,
+    X, X, X, X, X, _ ,
+    _, _, _, _, _, _ ,
+    
+    /* [ */
+    _, X, X, X, _, _ ,
+    _, X, _, _, _, _ ,
+    _, X, _, _, _, _ ,
+    _, X, _, _, _, _ ,
+    _, X, _, _, _, _ ,
+    _, X, _, _, _, _ ,
+    _, X, _, _, _, _ ,
+    _, X, X, X, _, _ ,
+    
+    /* \ */
+    _, X, _, _, _, _ ,
+    _, X, _, _, _, _ ,
+    _, _, X, _, _, _ ,
+    _, _, X, _, _, _ ,
+    _, _, _, X, _, _ ,
+    _, _, _, X, _, _ ,
+    _, _, _, _, X, _ ,
+    _, _, _, _, X, _ ,
+    
+    /* ] */
+    _, X, X, X, _, _ ,
+    _, _, _, X, _, _ ,
+    _, _, _, X, _, _ ,
+    _, _, _, X, _, _ ,
+    _, _, _, X, _, _ ,
+    _, _, _, X, _, _ ,
+    _, _, _, X, _, _ ,
+    _, X, X, X, _, _ ,
+    
+    /* ^ */
+    _, _, X, _, _, _ ,
+    _, X, _, X, _, _ ,
+    _, X, _, X, _, _ ,
+    X, _, _, _, X, _ ,
+    X, _, _, _, X, _ ,
+    _, _, _, _, _, _ ,
+    _, _, _, _, _, _ ,
+    _, _, _, _, _, _ ,
+    
+    /* _ */
+    _, _, _, _, _, _ ,
+    _, _, _, _, _, _ ,
+    _, _, _, _, _, _ ,
+    _, _, _, _, _, _ ,
+    _, _, _, _, _, _ ,
+    _, _, _, _, _, _ ,
+    _, _, _, _, _, _ ,
+    X, X, X, X, X, X ,
+    
+    /* ` */
+    _, X, _, _, _, _ ,
+    _, _, X, _, _, _ ,
+    _, _, _, X, _, _ ,
+    _, _, _, _, _, _ ,
+    _, _, _, _, _, _ ,
+    _, _, _, _, _, _ ,
+    _, _, _, _, _, _ ,
+    _, _, _, _, _, _ ,
+    
+    /* a */
+    _, _, _, _, _, _ ,
+    _, _, _, _, _, _ ,
+    _, X, X, _, _, _ ,
+    _, _, _, X, _, _ ,
+    _, X, X, X, _, _ ,
+    X, _, _, X, _, _ ,
+    _, X, X, _, X, _ ,
+    _, _, _, _, _, _ ,
+    
+    /* b */
+    X, _, _, _, _, _ ,
+    X, _, _, _, _, _ ,
+    X, _, X, X, _, _ ,
+    X, X, _, _, X, _ ,
+    X, _, _, _, X, _ ,
+    X, _, _, _, X, _ ,
+    X, X, X, X, _, _ ,
+    _, _, _, _, _, _ ,
+    
+    /* c */
+    _, _, _, _, _, _ ,
+    _, _, _, _, _, _ ,
+    _, X, X, X, _, _ ,
+    X, _, _, _, X, _ ,
+    X, _, _, _, _, _ ,
+    X, _, _, _, X, _ ,
+    _, X, X, X, _, _ ,
+    _, _, _, _, _, _ ,
+    
+    /* d */
+    _, _, _, _, X, _ ,
+    _, _, _, _, X, _ ,
+    _, X, X, X, X, _ ,
+    X, _, _, _, X, _ ,
+    X, _, _, _, X, _ ,
+    X, _, _, _, X, _ ,
+    _, X, X, X, X, _ ,
+    _, _, _, _, _, _ ,
+    
+    /* e */
+    _, _, _, _, _, _ ,
+    _, _, _, _, _, _ ,
+    _, X, X, X, _, _ ,
+    X, _, _, _, X, _ ,
+    X, X, X, X, X, _ ,
+    X, _, _, _, _, _ ,
+    _, X, X, X, X, _ ,
+    _, _, _, _, _, _ ,
+    
+    /* f */
+    _, _, X, X, _, _ ,
+    _, X, _, _, _, _ ,
+    X, X, X, X, _, _ ,
+    _, X, _, _, _, _ ,
+    _, X, _, _, _, _ ,
+    _, X, _, _, _, _ ,
+    _, X, _, _, _, _ ,
+    _, _, _, _, _, _ ,
+    
+    /* g */
+    _, _, _, _, _, _ ,
+    _, _, _, _, _, _ ,
+    _, X, X, X, X, _ ,
+    X, _, _, X, _, _ ,
+    _, X, X, _, _, _ ,
+    _, _, _, X, X, _ ,
+    X, _, _, _, X, _ ,
+    _, X, X, X, _, _ ,
+    
+    /* h */
+    X, _, _, _, _, _ ,
+    X, _, _, _, _, _ ,
+    X, _, X, X, _, _ ,
+    X, X, _, _, X, _ ,
+    X, _, _, _, X, _ ,
+    X, _, _, _, X, _ ,
+    X, _, _, _, X, _ ,
+    _, _, _, _, _, _ ,
+    
+    /* i */
+    _, _, X, _, _, _ ,
+    _, _, _, _, _, _ ,
+    X, X, X, _, _, _ ,
+    _, _, X, _, _, _ ,
+    _, _, X, _, _, _ ,
+    _, _, X, _, _, _ ,
+    _, _, X, _, _, _ ,
+    _, _, _, _, _, _ ,
+    
+    /* j */
+    _, _, X, _, _, _ ,
+    _, _, _, _, _, _ ,
+    X, X, X, _, _, _ ,
+    _, _, X, _, _, _ ,
+    _, _, X, _, _, _ ,
+    _, _, X, _, _, _ ,
+    _, _, X, _, _, _ ,
+    X, X, _, _, _, _ ,
+    
+    /* k */
+    X, _, _, _, _, _ ,
+    X, _, _, _, _, _ ,
+    X, _, _, _, X, _ ,
+    X, _, X, X, _, _ ,
+    X, X, _, _, _, _ ,
+    X, _, X, X, _, _ ,
+    X, _, _, _, X, _ ,
+    _, _, _, _, _, _ ,
+    
+    /* l */
+    X, X, X, _, _, _ ,
+    _, _, X, _, _, _ ,
+    _, _, X, _, _, _ ,
+    _, _, X, _, _, _ ,
+    _, _, X, _, _, _ ,
+    _, _, X, _, _, _ ,
+    _, _, _, X, X, _ ,
+    _, _, _, _, _, _ ,
+    
+    /* m */
+    _, _, _, _, _, _ ,
+    _, _, _, _, _, _ ,
+    X, X, X, X, _, _ ,
+    X, _, X, _, X, _ ,
+    X, _, X, _, X, _ ,
+    X, _, X, _, X, _ ,
+    X, _, X, _, X, _ ,
+    _, _, _, _, _, _ ,
+    
+    /* n */
+    _, _, _, _, _, _ ,
+    _, _, _, _, _, _ ,
+    X, _, X, X, _, _ ,
+    X, X, _, _, X, _ ,
+    X, _, _, _, X, _ ,
+    X, _, _, _, X, _ ,
+    X, _, _, _, X, _ ,
+    _, _, _, _, _, _ ,
+    
+    /* o */
+    _, _, _, _, _, _ ,
+    _, _, _, _, _, _ ,
+    _, X, X, X, _, _ ,
+    X, _, _, _, X, _ ,
+    X, _, _, _, X, _ ,
+    X, _, _, _, X, _ ,
+    _, X, X, X, _, _ ,
+    _, _, _, _, _, _ ,
+    
+    /* p */
+    _, _, _, _, _, _ ,
+    _, _, _, _, _, _ ,
+    X, X, X, X, _, _ ,
+    X, _, _, _, X, _ ,
+    X, _, _, _, X, _ ,
+    X, X, _, _, X, _ ,
+    X, _, X, X, _, _ ,
+    X, _, _, _, _, _ ,
+    
+    /* q */
+    _, _, _, _, _, _ ,
+    _, _, _, _, _, _ ,
+    _, X, X, X, X, _ ,
+    X, _, _, _, X, _ ,
+    X, _, _, _, X, _ ,
+    X, _, _, X, X, _ ,
+    _, X, X, _, X, _ ,
+    _, _, _, _, X, _ ,
+    
+    /* r */
+    _, _, _, _, _, _ ,
+    _, _, _, _, _, _ ,
+    _, X, _, X, _, _ ,
+    _, X, X, _, X, _ ,
+    _, X, _, _, _, _ ,
+    _, X, _, _, _, _ ,
+    _, X, _, _, _, _ ,
+    _, _, _, _, _, _ ,
+    
+    /* s */
+    _, _, _, _, _, _ ,
+    _, _, _, _, _, _ ,
+    _, X, X, X, X, _ ,
+    X, _, _, _, _, _ ,
+    _, X, X, X, _, _ ,
+    _, _, _, _, X, _ ,
+    X, X, X, X, _, _ ,
+    _, _, _, _, _, _ ,
+    
+    /* t */
+    _, _, _, _, _, _ ,
+    _, X, _, _, _, _ ,
+    X, X, X, X, X, _ ,
+    _, X, _, _, _, _ ,
+    _, X, _, _, _, _ ,
+    _, X, _, _, _, _ ,
+    _, _, X, X, X, _ ,
+    _, _, _, _, _, _ ,
+    
+    /* u */
+    _, _, _, _, _, _ ,
+    _, _, _, _, _, _ ,
+    X, _, _, _, X, _ ,
+    X, _, _, _, X, _ ,
+    X, _, _, _, X, _ ,
+    X, _, _, X, X, _ ,
+    _, X, X, _, X, _ ,
+    _, _, _, _, _, _ ,
+    
+    /* v */
+    _, _, _, _, _, _ ,
+    _, _, _, _, _, _ ,
+    X, _, _, _, X, _ ,
+    X, _, _, _, X, _ ,
+    _, X, _, X, _, _ ,
+    _, X, _, X, _, _ ,
+    _, _, X, _, _, _ ,
+    _, _, _, _, _, _ ,
+    
+    /* w */
+    _, _, _, _, _, _ ,
+    _, _, _, _, _, _ ,
+    X, _, _, _, X, _ ,
+    X, _, X, _, X, _ ,
+    X, _, X, _, X, _ ,
+    _, X, _, X, _, _ ,
+    _, X, _, X, _, _ ,
+    _, _, _, _, _, _ ,
+    
+    /* x */
+    _, _, _, _, _, _ ,
+    _, _, _, _, _, _ ,
+    X, _, _, _, X, _ ,
+    _, X, _, X, _, _ ,
+    _, _, X, _, _, _ ,
+    _, X, _, X, _, _ ,
+    X, _, _, _, X, _ ,
+    _, _, _, _, _, _ ,
+    
+    /* y */
+    _, _, _, _, _, _ ,
+    _, _, _, _, _, _ ,
+    X, _, _, _, X, _ ,
+    X, _, _, _, X, _ ,
+    X, _, _, X, X, _ ,
+    _, X, X, _, X, _ ,
+    _, _, _, _, X, _ ,
+    _, X, X, X, _, _ ,
+    
+    /* z */
+    _, _, _, _, _, _ ,
+    _, _, _, _, _, _ ,
+    X, X, X, X, X, _ ,
+    _, _, _, X, _, _ ,
+    _, _, X, _, _, _ ,
+    _, X, _, _, _, _ ,
+    X, X, X, X, X, _ ,
+    _, _, _, _, _, _ ,
+    
+    /* { */
+    _, _, X, X, _, _ ,
+    _, X, _, _, _, _ ,
+    _, X, _, _, _, _ ,
+    _, _, X, _, _, _ ,
+    _, _, X, _, _, _ ,
+    _, X, _, _, _, _ ,
+    _, X, _, _, _, _ ,
+    _, _, X, X, _, _ ,
+    
+    /* | */
+    _, _, X, _, _, _ ,
+    _, _, X, _, _, _ ,
+    _, _, X, _, _, _ ,
+    _, _, X, _, _, _ ,
+    _, _, X, _, _, _ ,
+    _, _, X, _, _, _ ,
+    _, _, X, _, _, _ ,
+    _, _, X, _, _, _ ,
+    
+    /* } */
+    _, X, X, _, _, _ ,
+    _, _, _, X, _, _ ,
+    _, _, _, X, _, _ ,
+    _, _, X, _, _, _ ,
+    _, _, X, _, _, _ ,
+    _, _, _, X, _, _ ,
+    _, _, _, X, _, _ ,
+    _, X, X, _, _, _ ,
+    
+    /* ~ */
+    _, _, _, _, _, X ,
+    _, _, _, _, _, _ ,
+    _, _, X, _, _, X ,
+    _, X, _, X, _, X ,
+    _, X, _, _, X, _ ,
+    _, _, _, _, _, _ ,
+    _, _, _, _, _, _ ,
+    _, _, _, _, _, _ ,
+};
diff --git a/SDL/font.h b/SDL/font.h
new file mode 100644
index 0000000..0c2c78a
--- /dev/null
+++ b/SDL/font.h
@@ -0,0 +1,9 @@
+#ifndef font_h
+#define font_h
+
+#include <stdint.h>
+extern uint8_t font[];
+#define GLYPH_HEIGHT 8
+#define GLYPH_WIDTH 6
+
+#endif /* font_h */
diff --git a/SDL/gui.c b/SDL/gui.c
new file mode 100644
index 0000000..dab10ef
--- /dev/null
+++ b/SDL/gui.c
@@ -0,0 +1,213 @@
+#include <SDL2/SDL.h>
+#include <stdbool.h>
+#include "utils.h"
+#include "gui.h"
+#include "font.h"
+
+static const SDL_Color gui_palette[4] = {{8, 24, 16,}, {57, 97, 57,}, {132, 165, 99}, {198, 222, 140}};
+static uint32_t gui_palette_native[4];
+
+SDL_Window *window = NULL;
+SDL_Renderer *renderer = NULL;
+SDL_Texture *texture = NULL;
+SDL_PixelFormat *pixel_format = NULL;
+enum scaling_mode scaling_mode = GB_SDL_SCALING_INTEGER_FACTOR;
+
+
+#ifdef __APPLE__
+#define MODIFIER_NAME "Cmd"
+#else
+#define MODIFIER_NAME "Ctrl"
+#endif
+
+
+static const char help[] =
+"Drop a GB or GBC ROM file to play.\n"
+"\n"
+"Controls:\n"
+"    D-Pad: Arrow Keys\n"
+"    A: X\n"
+"    B: Z\n"
+"    Start: Enter\n"
+"    Select: Backspace\n"
+"\n"
+"Keyboard Shortcuts: \n"
+"    Restart: " MODIFIER_NAME "+R\n"
+"    Pause: " MODIFIER_NAME "+P\n"
+"    Turbo: Space\n"
+#ifdef __APPLE__
+"    Mute/Unmute: " MODIFIER_NAME "+Shift+M\n"
+#else
+"    Mute/Unmute: " MODIFIER_NAME "+M\n"
+#endif
+"    Save state: " MODIFIER_NAME "+Number (0-9)\n"
+"    Load state: " MODIFIER_NAME "+Shift+Number (0-9)\n"
+"    Cycle between DMG/CGB emulation: " MODIFIER_NAME "+T\n"
+"    Cycle scaling modes: Tab"
+;
+
+void cycle_scaling(void)
+{
+    scaling_mode++;
+    scaling_mode %= GB_SDL_SCALING_MAX;
+    update_viewport();
+    SDL_RenderClear(renderer);
+    SDL_RenderCopy(renderer, texture, NULL, NULL);
+    SDL_RenderPresent(renderer);
+}
+
+void update_viewport(void)
+{
+    int win_width, win_height;
+    SDL_GetWindowSize(window, &win_width, &win_height);
+    double x_factor = win_width / 160.0;
+    double y_factor = win_height / 144.0;
+    
+    if (scaling_mode == GB_SDL_SCALING_INTEGER_FACTOR) {
+        x_factor = (int)(x_factor);
+        y_factor = (int)(y_factor);
+    }
+    
+    if (scaling_mode != GB_SDL_SCALING_ENTIRE_WINDOW) {
+        if (x_factor > y_factor) {
+            x_factor = y_factor;
+        }
+        else {
+            y_factor = x_factor;
+        }
+    }
+    
+    unsigned new_width = x_factor * 160;
+    unsigned new_height = y_factor * 144;
+    
+    SDL_Rect rect = (SDL_Rect){(win_width  - new_width) / 2, (win_height - new_height) /2,
+        new_width, new_height};
+    SDL_RenderSetViewport(renderer, &rect);
+}
+
+void show_help(void)
+{
+    SDL_ShowSimpleMessageBox(SDL_MESSAGEBOX_INFORMATION, "Help", help, window);
+}
+
+/* Does NOT check for bounds! */
+static void draw_char(uint32_t *buffer, unsigned char ch, uint32_t color)
+{
+    if (ch < ' ' || ch > '~') {
+        ch = '?';
+    }
+    
+    uint8_t *data = &font[(ch - ' ') * GLYPH_WIDTH * GLYPH_HEIGHT];
+    
+    for (unsigned y = GLYPH_HEIGHT; y--;) {
+        for (unsigned x = GLYPH_WIDTH; x--;) {
+            if (*(data++)) {
+                (*buffer) = color;
+            }
+            buffer++;
+        }
+        buffer += 160 - GLYPH_WIDTH;
+    }
+}
+
+/* Does NOT check for bounds! */
+static void draw_bordered_char(uint32_t *buffer, unsigned char ch, uint32_t color, uint32_t border)
+{
+    draw_char(buffer - 1, ch, border);
+    draw_char(buffer + 1, ch, border);
+    draw_char(buffer - 160, ch, border);
+    draw_char(buffer + 160, ch, border);
+    draw_char(buffer, ch, color);
+}
+
+static void draw_text(uint32_t *buffer, unsigned x, unsigned y, const char *string, uint32_t color, uint32_t border)
+{
+    unsigned orig_x = x;
+    while (*string) {
+        if (*string == '\n') {
+            x = orig_x;
+            y += GLYPH_HEIGHT + 4;
+            string++;
+            continue;
+        }
+        
+        if (x == 0 || x > 160 - GLYPH_WIDTH - 1 || y == 0 || y > 144 - GLYPH_HEIGHT - 1) {
+            break;
+        }
+        
+        draw_bordered_char(&buffer[x + 160 * y], *string, color, border);
+        x += GLYPH_WIDTH;
+        string++;
+    }
+}
+
+static void draw_text_centered(uint32_t *buffer, unsigned y, const char *string, uint32_t color, uint32_t border)
+{
+    draw_text(buffer, 160 / 2 - (unsigned) strlen(string) * GLYPH_WIDTH / 2, y, string, color, border);
+}
+
+
+extern void set_filename(const char *new_filename, bool new_should_free);
+void run_gui(void)
+{
+    /* Draw the "Drop file" screen */
+    static SDL_Surface *converted_background = NULL;
+    if (!converted_background) {
+        SDL_Surface *background = SDL_LoadBMP(executable_relative_path("background.bmp"));
+        SDL_SetPaletteColors(background->format->palette, gui_palette, 0, 4);
+        converted_background = SDL_ConvertSurface(background, pixel_format, 0);
+        SDL_LockSurface(converted_background);
+        SDL_FreeSurface(background);
+        
+        for (unsigned i = 4; i--; ) {
+            gui_palette_native[i] = SDL_MapRGB(pixel_format, gui_palette[i].r, gui_palette[i].g, gui_palette[i].b);
+        }
+    }
+
+    uint32_t pixels[160 * 144];
+    memcpy(pixels, converted_background->pixels, sizeof(pixels));
+    
+    draw_text_centered(pixels, 116, "Drop a GB or GBC", gui_palette_native[3], gui_palette_native[0]);
+    draw_text_centered(pixels, 128, "file to play", gui_palette_native[3], gui_palette_native[0]);
+    
+    SDL_UpdateTexture(texture, NULL, pixels, 160 * sizeof (uint32_t));
+    SDL_RenderClear(renderer);
+    SDL_RenderCopy(renderer, texture, NULL, NULL);
+    SDL_RenderPresent(renderer);
+
+    SDL_Event event;
+    while (SDL_WaitEvent(&event)) {
+        switch (event.type) {
+            case SDL_QUIT: {
+                exit(0);
+            }
+            case SDL_WINDOWEVENT: {
+                if (event.window.event == SDL_WINDOWEVENT_RESIZED) {
+                    update_viewport();
+                    SDL_RenderClear(renderer);
+                    SDL_RenderCopy(renderer, texture, NULL, NULL);
+                    SDL_RenderPresent(renderer);
+                }
+                break;
+            }
+            case SDL_DROPFILE: {
+                set_filename(event.drop.file, true);
+                return;
+            }
+            case SDL_KEYDOWN:
+                if (event.key.keysym.sym == SDLK_TAB) {
+                    cycle_scaling();
+                }
+#ifndef __APPLE__
+                else if (event.key.keysym.sym == SDLK_F1) {
+                    show_help();
+                }
+#else
+                else if (event.key.keysym.sym == SDLK_QUESTION || (event.key.keysym.sym && (event.key.keysym.mod & KMOD_SHIFT))) {
+                    show_help();
+                }
+#endif
+                break;
+        }
+    }
+}
diff --git a/SDL/gui.h b/SDL/gui.h
new file mode 100644
index 0000000..28ffc55
--- /dev/null
+++ b/SDL/gui.h
@@ -0,0 +1,25 @@
+#ifndef gui_h
+#define gui_h
+
+#include <SDL2/SDL.h>
+
+extern SDL_Window *window;
+extern SDL_Renderer *renderer;
+extern SDL_Texture *texture;
+extern SDL_PixelFormat *pixel_format;
+
+enum scaling_mode {
+    GB_SDL_SCALING_ENTIRE_WINDOW,
+    GB_SDL_SCALING_KEEP_RATIO,
+    GB_SDL_SCALING_INTEGER_FACTOR,
+    GB_SDL_SCALING_MAX,
+};
+
+extern enum scaling_mode scaling_mode;
+
+void update_viewport(void);
+void cycle_scaling(void);
+void show_help(void);
+
+void run_gui(void);
+#endif
diff --git a/SDL/main.c b/SDL/main.c
index e1fd764..d5035b9 100755
--- a/SDL/main.c
+++ b/SDL/main.c
@@ -2,8 +2,8 @@
 #include <signal.h>
 #include <SDL2/SDL.h>
 #include "gb.h"
-
 #include "utils.h"
+#include "gui.h"
 
 #ifndef _WIN32
 #define AUDIO_FREQUENCY 96000
@@ -12,37 +12,6 @@
 #define AUDIO_FREQUENCY 44100
 #endif
 
-#ifdef __APPLE__
-#define MODIFIER_NAME "Cmd"
-#else
-#define MODIFIER_NAME "Ctrl"
-#endif
-
-static const char help[] =
-"Drop a GB or GBC ROM file to play.\n"
-"\n"
-"Controls:\n"
-"    D-Pad: Arrow Keys\n"
-"    A: X\n"
-"    B: Z\n"
-"    Start: Enter\n"
-"    Select: Backspace\n"
-"\n"
-"Keyboard Shortcuts: \n"
-"    Restart: " MODIFIER_NAME "+R\n"
-"    Pause: " MODIFIER_NAME "+P\n"
-"    Turbo: Space\n"
-#ifdef __APPLE__
-"    Mute/Unmute: " MODIFIER_NAME "+Shift+M\n"
-#else
-"    Mute/Unmute: " MODIFIER_NAME "+M\n"
-#endif
-"    Save state: " MODIFIER_NAME "+Number (0-9)\n"
-"    Load state: " MODIFIER_NAME "+Shift+Number (0-9)\n"
-"    Cycle between DMG/CGB emulation: " MODIFIER_NAME "+T\n"
-"    Cycle scaling modes: Tab"
-;
-
 GB_gameboy_t gb;
 static bool dmg = false;
 static bool paused = false;
@@ -52,10 +21,15 @@ static char *filename = NULL;
 static bool should_free_filename = false;
 static char *battery_save_path_ptr;
 
-static SDL_Window *window = NULL;
-static SDL_Renderer *renderer = NULL;
-static SDL_Texture *texture = NULL;
-static SDL_PixelFormat *pixel_format = NULL;
+void set_filename(const char *new_filename, bool new_should_free)
+{
+    if (filename && should_free_filename) {
+        free(filename);
+    }
+    filename = (char *) new_filename;
+    should_free_filename = new_should_free;
+}
+
 static SDL_AudioSpec want_aspec, have_aspec;
 
 static char *captured_log = NULL;
@@ -106,53 +80,8 @@ static enum {
     GB_SDL_TOGGLE_MODEL_COMMAND,
 } pending_command;
 
-static enum {
-    GB_SDL_SCALING_ENTIRE_WINDOW,
-    GB_SDL_SCALING_KEEP_RATIO,
-    GB_SDL_SCALING_INTEGER_FACTOR,
-    GB_SDL_SCALING_MAX,
-} scaling_mode = GB_SDL_SCALING_INTEGER_FACTOR;
 static unsigned command_parameter;
 
-static void update_viewport(void)
-{
-    int win_width, win_height;
-    SDL_GetWindowSize(window, &win_width, &win_height);
-    double x_factor = win_width / 160.0;
-    double y_factor = win_height / 144.0;
-    
-    if (scaling_mode == GB_SDL_SCALING_INTEGER_FACTOR) {
-        x_factor = (int)(x_factor);
-        y_factor = (int)(y_factor);
-    }
-
-    if (scaling_mode != GB_SDL_SCALING_ENTIRE_WINDOW) {
-        if (x_factor > y_factor) {
-            x_factor = y_factor;
-        }
-        else {
-            y_factor = x_factor;
-        }
-    }
-    
-    unsigned new_width = x_factor * 160;
-    unsigned new_height = y_factor * 144;
-    
-    SDL_Rect rect = (SDL_Rect){(win_width  - new_width) / 2, (win_height - new_height) /2,
-        new_width, new_height};
-    SDL_RenderSetViewport(renderer, &rect);
-}
-
-static void cycle_scaling(void)
-{
-    scaling_mode++;
-    scaling_mode %= GB_SDL_SCALING_MAX;
-    update_viewport();
-    SDL_RenderClear(renderer);
-    SDL_RenderCopy(renderer, texture, NULL, NULL);
-    SDL_RenderPresent(renderer);
-}
-
 static void handle_events(GB_gameboy_t *gb)
 {
 #ifdef __APPLE__
@@ -169,11 +98,7 @@ static void handle_events(GB_gameboy_t *gb)
                 exit(0);
                 
             case SDL_DROPFILE: {
-                if (should_free_filename) {
-                    SDL_free(filename);
-                }
-                filename = event.drop.file;
-                should_free_filename = true;
+                set_filename(filename, true);
                 pending_command = GB_SDL_NEW_FILE_COMMAND;
                 break;
             }
@@ -236,7 +161,7 @@ static void handle_events(GB_gameboy_t *gb)
                             break;
                         }
                     case SDLK_QUESTION:
-                            SDL_ShowSimpleMessageBox(SDL_MESSAGEBOX_INFORMATION, "Help", help, window);
+                        show_help();
 #endif
                         
                     default:
@@ -495,55 +420,8 @@ usage:
     SDL_EventState(SDL_DROPFILE, SDL_ENABLE);
     
     if (filename == NULL) {
-        /* Draw the "Drop file" screen */
-        SDL_Surface *drop_backround = SDL_LoadBMP(executable_relative_path("drop.bmp"));
-        SDL_Surface *drop_converted = SDL_ConvertSurface(drop_backround, pixel_format, 0);
-        SDL_LockSurface(drop_converted);
-        SDL_UpdateTexture(texture, NULL, drop_converted->pixels, drop_converted->pitch);
-        SDL_RenderClear(renderer);
-        SDL_RenderCopy(renderer, texture, NULL, NULL);
-        SDL_RenderPresent(renderer);
-        SDL_FreeSurface(drop_converted);
-        SDL_FreeSurface(drop_backround);
-        SDL_Event event;
-        while (SDL_WaitEvent(&event))
-        {
-            switch (event.type) {
-                case SDL_QUIT: {
-                    exit(0);
-                }
-                case SDL_WINDOWEVENT: {
-                    if (event.window.event == SDL_WINDOWEVENT_RESIZED) {
-                        update_viewport();
-                        SDL_RenderClear(renderer);
-                        SDL_RenderCopy(renderer, texture, NULL, NULL);
-                        SDL_RenderPresent(renderer);
-                    }
-                    break;
-                }
-                case SDL_DROPFILE: {
-                    filename = event.drop.file;
-                    should_free_filename = true;
-                    goto start;
-                }
-                case SDL_KEYDOWN:
-                    if (event.key.keysym.sym == SDLK_TAB) {
-                        cycle_scaling();
-                    }
-#ifndef __APPLE__
-                    else if (event.key.keysym.sym == SDLK_F1) {
-                        SDL_ShowSimpleMessageBox(SDL_MESSAGEBOX_INFORMATION, "Help", help, window);
-                    }
-#else
-                    else if (event.key.keysym.sym == SDLK_QUESTION || (event.key.keysym.sym && (event.key.keysym.mod & KMOD_SHIFT))) {
-                        SDL_ShowSimpleMessageBox(SDL_MESSAGEBOX_INFORMATION, "Help", help, window);
-                    }
-#endif
-                    break;
-            }
-        }
+        run_gui();
     }
-start:
     run(); // Never returns
     return 0;
 }