Merge branch 'sdl2'

Core/display.c

@@ -1,5 +1,4 @@
 #include <stdbool.h>
-#include <unistd.h>
 #include <stdlib.h>
 #include <assert.h>
 #include <string.h>

Core/gb.c

@@ -2,12 +2,13 @@
 #include <stdbool.h>
 #include <stdlib.h>
 #include <stddef.h>
-#include <unistd.h>
 #include <string.h>
 #include <errno.h>
 #include <stdarg.h>
-#include <sys/time.h>
+#ifndef _WIN32
+#include <unistd.h>
 #include <sys/select.h>
+#endif
 #include "gb.h"
 
 void GB_attributed_logv(GB_gameboy_t *gb, GB_log_attributes attributes, const char *fmt, va_list args)
@@ -34,7 +35,7 @@ void GB_attributed_log(GB_gameboy_t *gb, GB_log_attributes attributes, const cha
     va_end(args);
 }
 
-void GB_log(GB_gameboy_t *gb,const char *fmt, ...)
+void GB_log(GB_gameboy_t *gb, const char *fmt, ...)
 {
     va_list args;
     va_start(args, fmt);
@@ -150,7 +151,10 @@ void GB_free(GB_gameboy_t *gb)
 int GB_load_boot_rom(GB_gameboy_t *gb, const char *path)
 {
     FILE *f = fopen(path, "rb");
-    if (!f) return errno;
+    if (!f) {
+        GB_log(gb, "Could not open boot ROM: %s.\n", strerror(errno));
+        return errno;
+    }
     fread(gb->boot_rom, sizeof(gb->boot_rom), 1, f);
     fclose(f);
     return 0;
@@ -159,7 +163,10 @@ int GB_load_boot_rom(GB_gameboy_t *gb, const char *path)
 int GB_load_rom(GB_gameboy_t *gb, const char *path)
 {
     FILE *f = fopen(path, "rb");
-    if (!f) return errno;
+    if (!f) {
+        GB_log(gb, "Could not open ROM: %s.\n", strerror(errno));
+        return errno;
+    }
     fseek(f, 0, SEEK_END);
     gb->rom_size = (ftell(f) + 0x3FFF) & ~0x3FFF; /* Round to bank */
     /* And then round to a power of two */
@@ -201,6 +208,7 @@ int GB_save_state(GB_gameboy_t *gb, const char *path)
 {
     FILE *f = fopen(path, "wb");
     if (!f) {
+        GB_log(gb, "Could not open save state: %s.\n", strerror(errno));
         return errno;
     }
 
@@ -268,6 +276,7 @@ int GB_load_state(GB_gameboy_t *gb, const char *path)
 
     FILE *f = fopen(path, "rb");
     if (!f) {
+        GB_log(gb, "Could not open save state: %s.\n", strerror(errno));
         return errno;
     }
 
@@ -344,6 +353,7 @@ int GB_save_battery(GB_gameboy_t *gb, const char *path)
     if (gb->mbc_ram_size == 0 && !gb->cartridge_type->has_rtc) return 0; /* Claims to have battery, but has no RAM or RTC */
     FILE *f = fopen(path, "wb");
     if (!f) {
+        GB_log(gb, "Could not open save state: %s.\n", strerror(errno));
         return errno;
     }
 
@@ -651,12 +661,14 @@ void GB_switch_model_and_reset(GB_gameboy_t *gb, bool is_cgb)
 void *GB_get_direct_access(GB_gameboy_t *gb, GB_direct_access_t access, size_t *size, uint16_t *bank)
 {
     /* Set size and bank to dummy pointers if not set */
+    size_t dummy_size;
+    uint16_t dummy_bank;
     if (!size) {
-        size = alloca(sizeof(size));
+        size = &dummy_size;
     }
     
     if (!bank) {
-        bank = alloca(sizeof(bank));
+        bank = &dummy_bank;
     }
     
     

Core/symbol_hash.c

@@ -1,7 +1,4 @@
 #include "gb.h"
-#ifdef _WIN32
-typedef intptr_t ssize_t;
-#endif
 
 static size_t GB_map_find_symbol_index(GB_symbol_map_t *map, uint16_t addr)
 {

Makefile

@@ -43,10 +43,10 @@ endif
 # Set compilation and linkage flags based on target, platform and configuration
 
 CFLAGS += -Werror -Wall -std=gnu11 -ICore -D_GNU_SOURCE -DVERSION="$(VERSION)" -I. -D_USE_MATH_DEFINES
-SDL_LDFLAGS := -lSDL
+SDL_LDFLAGS := -lSDL2
 ifeq ($(PLATFORM),windows32)
 CFLAGS += -IWindows
-LDFLAGS += -lmsvcrt -lSDLmain -Wl,/MANIFESTFILE:NUL
+LDFLAGS += -lmsvcrt -lSDL2main -Wl,/MANIFESTFILE:NUL
 else
 LDFLAGS += -lc -lm
 endif
@@ -56,19 +56,16 @@ SYSROOT := $(shell xcodebuild -sdk macosx -version Path 2> /dev/null)
 CFLAGS += -F/Library/Frameworks
 OCFLAGS += -x objective-c -fobjc-arc -Wno-deprecated-declarations -isysroot $(SYSROOT) -mmacosx-version-min=10.9
 LDFLAGS += -framework AppKit -framework PreferencePanes -framework Carbon -framework QuartzCore
-SDL_LDFLAGS := -F/Library/Frameworks -framework SDL
+SDL_LDFLAGS := -F/Library/Frameworks -framework SDL2
 endif
-
+CFLAGS += -Wno-deprecated-declarations
 ifeq ($(PLATFORM),windows32)
 CFLAGS += -Wno-deprecated-declarations # Seems like Microsoft deprecated every single LIBC function
-LDFLAGS += -Wl,/NODEFAULTLIB:libcmt
+LDFLAGS += -Wl,/NODEFAULTLIB:libcmt.lib
 endif
 
 ifeq ($(CONF),debug)
 CFLAGS += -g
-ifeq ($(PLATFORM),windows32)
-LDFLAGS += -Wl,/debug
-endif
 else ifeq ($(CONF), release)
 CFLAGS += -O3 -DNDEBUG
 ifneq ($(PLATFORM),windows32)
@@ -82,16 +79,16 @@ endif
 # Define our targets
 
 ifeq ($(PLATFORM),windows32)
-SDL_TARGET := $(BIN)/sdl/sameboy.exe $(BIN)/sdl/sameboy_debugger.exe $(BIN)/sdl/SDL.dll
+SDL_TARGET := $(BIN)/SDL/sameboy.exe $(BIN)/SDL/sameboy_debugger.exe $(BIN)/SDL/SDL2.dll
 TESTER_TARGET := $(BIN)/tester/sameboy_tester.exe
 else
-SDL_TARGET := $(BIN)/sdl/sameboy
+SDL_TARGET := $(BIN)/SDL/sameboy
 TESTER_TARGET := $(BIN)/tester/sameboy_tester
 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
+sdl: $(SDL_TARGET) $(BIN)/SDL/dmg_boot.bin $(BIN)/SDL/cgb_boot.bin $(BIN)/SDL/LICENSE $(BIN)/SDL/registers.sym $(BIN)/SDL/drop.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
@@ -105,7 +102,6 @@ TESTER_SOURCES := $(shell ls Tester/*.c)
 ifeq ($(PLATFORM),Darwin)
 COCOA_SOURCES := $(shell ls Cocoa/*.m) $(shell ls HexFiend/*.m)
 QUICKLOOK_SOURCES := $(shell ls QuickLook/*.m) $(shell ls QuickLook/*.c)
-SDL_SOURCES += $(shell ls SDL/*.m)
 endif
 
 CORE_OBJECTS := $(patsubst %,$(OBJ)/%.o,$(CORE_SOURCES))
@@ -213,7 +209,7 @@ $(BIN)/SameBoy.qlgenerator/Contents/Resources/cgb_boot_fast.bin: $(BIN)/BootROMs
 # SDL Port
 
 # Unix versions build only one binary
-$(BIN)/sdl/sameboy: $(CORE_OBJECTS) $(SDL_OBJECTS)
+$(BIN)/SDL/sameboy: $(CORE_OBJECTS) $(SDL_OBJECTS)
 	-@$(MKDIR) -p $(dir $@)
 	$(CC) $^ -o $@ $(LDFLAGS) $(SDL_LDFLAGS)
 ifeq ($(CONF), release)
@@ -221,11 +217,11 @@ ifeq ($(CONF), release)
 endif
 
 # Windows version builds two, one with a conole and one without it
-$(BIN)/sdl/sameboy.exe: $(CORE_OBJECTS) $(SDL_OBJECTS) $(OBJ)/Windows/resources.o
+$(BIN)/SDL/sameboy.exe: $(CORE_OBJECTS) $(SDL_OBJECTS) $(OBJ)/Windows/resources.o
 	-@$(MKDIR) -p $(dir $@)
 	$(CC) $^ -o $@ $(LDFLAGS) $(SDL_LDFLAGS) -Wl,/subsystem:windows
 
-$(BIN)/sdl/sameboy_debugger.exe: $(CORE_OBJECTS) $(SDL_OBJECTS) $(OBJ)/Windows/resources.o
+$(BIN)/SDL/sameboy_debugger.exe: $(CORE_OBJECTS) $(SDL_OBJECTS) $(OBJ)/Windows/resources.o
 	-@$(MKDIR) -p $(dir $@)
 	$(CC) $^ -o $@ $(LDFLAGS) $(SDL_LDFLAGS) -Wl,/subsystem:console
 
@@ -236,11 +232,11 @@ $(OBJ)/%.res: %.rc
 %.o: %.res
 	cvtres /OUT:"$@" $^
 
-# We must provide SDL.dll with the Windows port. This is an AWFUL HACK to find it.
+# We must provide SDL2.dll with the Windows port. This is an AWFUL HACK to find it.
 SPACE :=
 SPACE +=
-$(BIN)/sdl/SDL.dll:
+$(BIN)/SDL/SDL2.dll:
-	@$(eval POTENTIAL_MATCHES := $(subst @@@," ",$(patsubst %,%/SDL.dll,$(subst ;,$(SPACE),$(subst $(SPACE),@@@,$(lib))))))
+	@$(eval POTENTIAL_MATCHES := $(subst @@@," ",$(patsubst %,%/SDL2.dll,$(subst ;,$(SPACE),$(subst $(SPACE),@@@,$(lib))))))
 	@$(eval MATCH := $(shell ls $(POTENTIAL_MATCHES) 2> NUL | head -n 1))
 	cp "$(MATCH)" $@
 
@@ -257,7 +253,7 @@ $(BIN)/tester/sameboy_tester.exe: $(CORE_OBJECTS) $(SDL_OBJECTS)
 	-@$(MKDIR) -p $(dir $@)
 	$(CC) $^ -o $@ $(LDFLAGS) -Wl,/subsystem:console
 
-$(BIN)/sdl/%.bin $(BIN)/tester/%.bin: $(BOOTROMS_DIR)/%.bin
+$(BIN)/SDL/%.bin $(BIN)/tester/%.bin: $(BOOTROMS_DIR)/%.bin
 	-@$(MKDIR) -p $(dir $@)
 	cp -f $^ $@
 	
@@ -265,10 +261,13 @@ $(BIN)/SameBoy.app/Contents/Resources/%.bin: $(BOOTROMS_DIR)/%.bin
 	-@$(MKDIR) -p $(dir $@)
 	cp -f $^ $@
 	
-$(BIN)/sdl/LICENSE: LICENSE
+$(BIN)/SDL/LICENSE: LICENSE
 	cp -f $^ $@
 
-$(BIN)/sdl/registers.sym: Misc/registers.sym
+$(BIN)/SDL/registers.sym: Misc/registers.sym
+	cp -f $^ $@
+	
+$(BIN)/SDL/drop.bmp: SDL/drop.bmp
 	cp -f $^ $@
 
 # Boot ROMs

SDL/SDLMain.h

@@ -1,16 +0,0 @@
-/*   SDLMain.m - main entry point for our Cocoa-ized SDL app
-       Initial Version: Darrell Walisser <dwaliss1@purdue.edu>
-       Non-NIB-Code & other changes: Max Horn <max@quendi.de>
-
-    Feel free to customize this file to suit your needs
-*/
-
-#ifndef _SDLMain_h_
-#define _SDLMain_h_
-
-#import <Cocoa/Cocoa.h>
-
-@interface SDLMain : NSObject<NSApplicationDelegate>
-@end
-
-#endif /* _SDLMain_h_ */

SDL/SDLMain.m

@@ -1,382 +0,0 @@
-/*   SDLMain.m - main entry point for our Cocoa-ized SDL app
-       Initial Version: Darrell Walisser <dwaliss1@purdue.edu>
-       Non-NIB-Code & other changes: Max Horn <max@quendi.de>
-
-    Feel free to customize this file to suit your needs
-*/
-
-#include <SDL/SDL.h>
-#include "SDLMain.h"
-#include <sys/param.h> /* for MAXPATHLEN */
-#include <unistd.h>
-#import <objc/runtime.h>
-
-/* For some reaon, Apple removed setAppleMenu from the headers in 10.4,
- but the method still is there and works. To avoid warnings, we declare
- it ourselves here. */
-@interface NSApplication(SDL_Missing_Methods)
-- (void)setAppleMenu:(NSMenu *)menu;
-@end
-
-/* Use this flag to determine whether we use SDLMain.nib or not */
-#define        SDL_USE_NIB_FILE    0
-
-/* Use this flag to determine whether we use CPS (docking) or not */
-#define        SDL_USE_CPS        1
-#ifdef SDL_USE_CPS
-/* Portions of CPS.h */
-typedef struct CPSProcessSerNum
-{
-    UInt32        lo;
-    UInt32        hi;
-} CPSProcessSerNum;
-
-extern OSErr    CPSGetCurrentProcess( CPSProcessSerNum *psn);
-extern OSErr     CPSEnableForegroundOperation( CPSProcessSerNum *psn, UInt32 _arg2, UInt32 _arg3, UInt32 _arg4, UInt32 _arg5);
-extern OSErr    CPSSetFrontProcess( CPSProcessSerNum *psn);
-
-#endif /* SDL_USE_CPS */
-
-static int    gArgc;
-static char  **gArgv;
-static BOOL   gFinderLaunch;
-static BOOL   gCalledAppMainline = FALSE;
-
-static NSString *getApplicationName(void)
-{
-    const NSDictionary *dict;
-    NSString *appName = 0;
-
-    /* Determine the application name */
-    dict = (__bridge const NSDictionary *)CFBundleGetInfoDictionary(CFBundleGetMainBundle());
-    if (dict)
-        appName = [dict objectForKey: @"CFBundleName"];
-    
-    if (![appName length])
-        appName = [[NSProcessInfo processInfo] processName];
-
-    return appName;
-}
-
-#if SDL_USE_NIB_FILE
-/* A helper category for NSString */
-@interface NSString (ReplaceSubString)
-- (NSString *)stringByReplacingRange:(NSRange)aRange with:(NSString *)aString;
-@end
-#endif
-
-@interface NSApplication (SDLApplication)
-@end
-
-@implementation NSApplication (SDLApplication)
-/* Invoked from the Quit menu item */
-- (void)_terminate:(id)sender
-{
-    /* Post a SDL_QUIT event */
-    SDL_Event event;
-    event.type = SDL_QUIT;
-    SDL_PushEvent(&event);
-    /* Call "super" */
-    [self _terminate:sender];
-}
-
-/* Use swizzling to avoid warning and undocumented Obj C runtime behavior. Didn't feel like rewriting SDLMain for this. */
-+ (void) load
-{
-    method_exchangeImplementations(class_getInstanceMethod(self, @selector(terminate:)), class_getInstanceMethod(self, @selector(_terminate:)));
-}
-@end
-
-/* The main class of the application, the application's delegate */
-@implementation SDLMain
-
-/* Set the working directory to the .app's parent directory */
-- (void) setupWorkingDirectory:(BOOL)shouldChdir
-{
-    if (shouldChdir)
-    {
-        char parentdir[MAXPATHLEN];
-        CFURLRef url = CFBundleCopyBundleURL(CFBundleGetMainBundle());
-        CFURLRef url2 = CFURLCreateCopyDeletingLastPathComponent(0, url);
-        if (CFURLGetFileSystemRepresentation(url2, 1, (UInt8 *)parentdir, MAXPATHLEN)) {
-            chdir(parentdir);   /* chdir to the binary app's parent */
-        }
-        CFRelease(url);
-        CFRelease(url2);
-    }
-}
-
-#if SDL_USE_NIB_FILE
-
-/* Fix menu to contain the real app name instead of "SDL App" */
-- (void)fixMenu:(NSMenu *)aMenu withAppName:(NSString *)appName
-{
-    NSRange aRange;
-    NSEnumerator *enumerator;
-    NSMenuItem *menuItem;
-
-    aRange = [[aMenu title] rangeOfString:@"SDL App"];
-    if (aRange.length != 0)
-        [aMenu setTitle: [[aMenu title] stringByReplacingRange:aRange with:appName]];
-
-    enumerator = [[aMenu itemArray] objectEnumerator];
-    while ((menuItem = [enumerator nextObject]))
-    {
-        aRange = [[menuItem title] rangeOfString:@"SDL App"];
-        if (aRange.length != 0)
-            [menuItem setTitle: [[menuItem title] stringByReplacingRange:aRange with:appName]];
-        if ([menuItem hasSubmenu])
-            [self fixMenu:[menuItem submenu] withAppName:appName];
-    }
-}
-
-#else
-
-static void setApplicationMenu(void)
-{
-    /* warning: this code is very odd */
-    NSMenu *appleMenu;
-    NSMenuItem *menuItem;
-    NSString *title;
-    NSString *appName;
-    
-    appName = getApplicationName();
-    appleMenu = [[NSMenu alloc] initWithTitle:@""];
-    
-    /* Add menu items */
-    title = [@"About " stringByAppendingString:appName];
-    [appleMenu addItemWithTitle:title action:@selector(orderFrontStandardAboutPanel:) keyEquivalent:@""];
-
-    [appleMenu addItem:[NSMenuItem separatorItem]];
-
-    title = [@"Hide " stringByAppendingString:appName];
-    [appleMenu addItemWithTitle:title action:@selector(hide:) keyEquivalent:@"h"];
-
-    menuItem = (NSMenuItem *)[appleMenu addItemWithTitle:@"Hide Others" action:@selector(hideOtherApplications:) keyEquivalent:@"h"];
-    [menuItem setKeyEquivalentModifierMask:(NSAlternateKeyMask|NSCommandKeyMask)];
-
-    [appleMenu addItemWithTitle:@"Show All" action:@selector(unhideAllApplications:) keyEquivalent:@""];
-
-    [appleMenu addItem:[NSMenuItem separatorItem]];
-
-    title = [@"Quit " stringByAppendingString:appName];
-    [appleMenu addItemWithTitle:title action:@selector(terminate:) keyEquivalent:@"q"];
-
-    
-    /* Put menu into the menubar */
-    menuItem = [[NSMenuItem alloc] initWithTitle:@"" action:nil keyEquivalent:@""];
-    [menuItem setSubmenu:appleMenu];
-    [[NSApp mainMenu] addItem:menuItem];
-
-    /* Tell the application object that this is now the application menu */
-    [NSApp setAppleMenu:appleMenu];
-
-}
-
-/* Create a window menu */
-static void setupWindowMenu(void)
-{
-    NSMenu      *windowMenu;
-    NSMenuItem  *windowMenuItem;
-    NSMenuItem  *menuItem;
-
-    windowMenu = [[NSMenu alloc] initWithTitle:@"Window"];
-    
-    /* "Minimize" item */
-    menuItem = [[NSMenuItem alloc] initWithTitle:@"Minimize" action:@selector(performMiniaturize:) keyEquivalent:@"m"];
-    [windowMenu addItem:menuItem];
-    
-    /* Put menu into the menubar */
-    windowMenuItem = [[NSMenuItem alloc] initWithTitle:@"Window" action:nil keyEquivalent:@""];
-    [windowMenuItem setSubmenu:windowMenu];
-    [[NSApp mainMenu] addItem:windowMenuItem];
-    
-    /* Tell the application object that this is now the window menu */
-    [NSApp setWindowsMenu:windowMenu];
-
-    /* Finally give up our references to the objects */
-}
-
-/* Replacement for NSApplicationMain */
-static void CustomApplicationMain (int argc, char **argv)
-{
-    SDLMain                *sdlMain;
-
-    /* Ensure the application object is initialised */
-    [NSApplication sharedApplication];
-    
-#ifdef SDL_USE_CPS
-    {
-        CPSProcessSerNum PSN;
-        /* Tell the dock about us */
-        if (!CPSGetCurrentProcess(&PSN))
-            if (!CPSEnableForegroundOperation(&PSN,0x03,0x3C,0x2C,0x1103))
-                if (!CPSSetFrontProcess(&PSN))
-                    [NSApplication sharedApplication];
-    }
-#endif /* SDL_USE_CPS */
-
-    /* Set up the menubar */
-    [NSApp setMainMenu:[[NSMenu alloc] init]];
-    setApplicationMenu();
-    setupWindowMenu();
-
-    /* Create SDLMain and make it the app delegate */
-    sdlMain = [[SDLMain alloc] init];
-    [NSApp setDelegate:sdlMain];
-    
-    /* Start the main event loop */
-    [NSApp run];
-}
-
-#endif
-
-
-/*
- * Catch document open requests...this lets us notice files when the app
- *  was launched by double-clicking a document, or when a document was
- *  dragged/dropped on the app's icon. You need to have a
- *  CFBundleDocumentsType section in your Info.plist to get this message,
- *  apparently.
- *
- * Files are added to gArgv, so to the app, they'll look like command line
- *  arguments. Previously, apps launched from the finder had nothing but
- *  an argv[0].
- *
- * This message may be received multiple times to open several docs on launch.
- *
- * This message is ignored once the app's mainline has been called.
- */
-- (BOOL)application:(NSApplication *)theApplication openFile:(NSString *)filename
-{
-    const char *temparg;
-    size_t arglen;
-    char *arg;
-    char **newargv;
-
-    if (!gFinderLaunch)  /* MacOS is passing command line args. */
-        return FALSE;
-
-    if (gCalledAppMainline)  /* app has started, ignore this document. */
-        return FALSE;
-
-    temparg = [filename UTF8String];
-    arglen = SDL_strlen(temparg) + 1;
-    arg = (char *) SDL_malloc(arglen);
-    if (arg == NULL)
-        return FALSE;
-
-    newargv = (char **) realloc(gArgv, sizeof (char *) * (gArgc + 2));
-    if (newargv == NULL)
-    {
-        SDL_free(arg);
-        return FALSE;
-    }
-    gArgv = newargv;
-
-    SDL_strlcpy(arg, temparg, arglen);
-    gArgv[gArgc++] = arg;
-    gArgv[gArgc] = NULL;
-    return TRUE;
-}
-
-
-/* Called when the internal event loop has just started running */
-- (void) applicationDidFinishLaunching: (NSNotification *) note
-{
-    int status;
-
-    /* Set the working directory to the .app's parent directory */
-    [self setupWorkingDirectory:gFinderLaunch];
-
-#if SDL_USE_NIB_FILE
-    /* Set the main menu to contain the real app name instead of "SDL App" */
-    [self fixMenu:[NSApp mainMenu] withAppName:getApplicationName()];
-#endif
-
-    /* Hand off to main application code */
-    gCalledAppMainline = TRUE;
-    status = SDL_main (gArgc, gArgv);
-
-    /* We're done, thank you for playing */
-    exit(status);
-}
-@end
-
-
-@implementation NSString (ReplaceSubString)
-
-- (NSString *)stringByReplacingRange:(NSRange)aRange with:(NSString *)aString
-{
-    unsigned int bufferSize;
-    unsigned int selfLen = [self length];
-    unsigned int aStringLen = [aString length];
-    unichar *buffer;
-    NSRange localRange;
-    NSString *result;
-
-    bufferSize = selfLen + aStringLen - aRange.length;
-    buffer = (unichar *)NSAllocateMemoryPages(bufferSize*sizeof(unichar));
-    
-    /* Get first part into buffer */
-    localRange.location = 0;
-    localRange.length = aRange.location;
-    [self getCharacters:buffer range:localRange];
-    
-    /* Get middle part into buffer */
-    localRange.location = 0;
-    localRange.length = aStringLen;
-    [aString getCharacters:(buffer+aRange.location) range:localRange];
-     
-    /* Get last part into buffer */
-    localRange.location = aRange.location + aRange.length;
-    localRange.length = selfLen - localRange.location;
-    [self getCharacters:(buffer+aRange.location+aStringLen) range:localRange];
-    
-    /* Build output string */
-    result = [NSString stringWithCharacters:buffer length:bufferSize];
-    
-    NSDeallocateMemoryPages(buffer, bufferSize);
-    
-    return result;
-}
-
-@end
-
-
-void cocoa_disable_filtering(void) {
-    CGContextSetInterpolationQuality([[NSGraphicsContext currentContext] CGContext], kCGInterpolationNone);
-}
-
-#ifdef main
-#  undef main
-#endif
-
-/* Main entry point to executable - should *not* be SDL_main! */
-int main (int argc, char **argv)
-{
-    /* Copy the arguments into a global variable */
-    /* This is passed if we are launched by double-clicking */
-    if ( argc >= 2 && strncmp (argv[1], "-psn", 4) == 0 ) {
-        gArgv = (char **) SDL_malloc(sizeof (char *) * 2);
-        gArgv[0] = argv[0];
-        gArgv[1] = NULL;
-        gArgc = 1;
-        gFinderLaunch = YES;
-    } else {
-        int i;
-        gArgc = argc;
-        gArgv = (char **) SDL_malloc(sizeof (char *) * (argc+1));
-        for (i = 0; i <= argc; i++)
-            gArgv[i] = argv[i];
-        gFinderLaunch = NO;
-    }
-
-#if SDL_USE_NIB_FILE
-    NSApplicationMain (argc, argv);
-#else
-    CustomApplicationMain (argc, argv);
-#endif
-    return 0;
-}
-

SDL/main.c

@@ -1,42 +1,261 @@
-#include <stdio.h>
 #include <stdbool.h>
-#include <unistd.h>
-#include <time.h>
-#include <assert.h>
 #include <signal.h>
-#include <SDL/SDL.h>
+#include <SDL2/SDL.h>
+#include "gb.h"
+
+#include "utils.h"
+
 #ifndef _WIN32
 #define AUDIO_FREQUENCY 96000
 #else
 /* Windows (well, at least my VM) can't handle 96KHz sound well :( */
 #define AUDIO_FREQUENCY 44100
-#include <direct.h>
-#include <windows.h>
-#define snprintf _snprintf
 #endif
 
-#include "gb.h"
-
-static bool running = false;
-static char *filename;
-static void replace_extension(const char *src, size_t length, char *dest, const char *ext);
-GB_gameboy_t gb;
-
-static void GB_update_keys_status(GB_gameboy_t *gb)
-{
-    static bool ctrl = false;
-    static bool shift = false;
 #ifdef __APPLE__
-    static bool cmd = false;
+#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;
+static uint32_t pixels[160*144];
+
+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;
+static SDL_AudioSpec want_aspec, have_aspec;
+
+static char *captured_log = NULL;
+
+static void log_capture_callback(GB_gameboy_t *gb, const char *string, GB_log_attributes attributes)
+{
+    size_t current_len = strlen(captured_log);
+    size_t len_to_add = strlen(string);
+    captured_log = realloc(captured_log, current_len + len_to_add + 1);
+    memcpy(captured_log + current_len, string, len_to_add);
+    captured_log[current_len + len_to_add] = 0;
+}
+
+static void start_capturing_logs(void)
+{
+    if (captured_log != NULL) {
+        free(captured_log);
+    }
+    captured_log = malloc(1);
+    captured_log[0] = 0;
+    GB_set_log_callback(&gb, log_capture_callback);
+}
+
+static const char *end_capturing_logs(bool show_popup, bool should_exit)
+{
+    GB_set_log_callback(&gb, NULL);
+    if (captured_log[0] == 0) {
+        free(captured_log);
+        captured_log = NULL;
+    }
+    else {
+        if (show_popup) {
+            SDL_ShowSimpleMessageBox(SDL_MESSAGEBOX_ERROR, "Error", captured_log, window);
+        }
+        if (should_exit) {
+            exit(1);
+        }
+    }
+    return captured_log;
+}
+
+static enum {
+    GB_SDL_NO_COMMAND,
+    GB_SDL_SAVE_STATE_COMMAND,
+    GB_SDL_LOAD_STATE_COMMAND,
+    GB_SDL_RESET_COMMAND,
+    GB_SDL_NEW_FILE_COMMAND,
+    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__
+#define MODIFIER KMOD_GUI
+#else
+#define MODIFIER KMOD_CTRL
 #endif
     SDL_Event event;
     while (SDL_PollEvent(&event))
     {
-        switch( event.type ){
+        switch (event.type) {
             case SDL_QUIT:
-                running = false;
+                GB_save_battery(gb, battery_save_path_ptr);
+                exit(0);
+                
+            case SDL_DROPFILE: {
+                if (should_free_filename) {
+                    SDL_free(filename);
+                }
+                filename = event.drop.file;
+                should_free_filename = true;
+                pending_command = GB_SDL_NEW_FILE_COMMAND;
+                break;
+            }
+                
+            case SDL_WINDOWEVENT: {
+                if (event.window.event == SDL_WINDOWEVENT_RESIZED) {
+                    update_viewport();
+                }
+            }
+                
             case SDL_KEYDOWN:
-            case SDL_KEYUP:
+                switch (event.key.keysym.sym) {
+                    case SDLK_c:
+                        if (event.type == SDL_KEYDOWN && (event.key.keysym.mod & KMOD_CTRL)) {
+                            GB_debugger_break(gb);
+                            
+                        }
+                        break;
+                        
+                    case SDLK_r:
+                        if (event.key.keysym.mod & MODIFIER) {
+                            pending_command = GB_SDL_RESET_COMMAND;
+                        }
+                        break;
+                        
+                    case SDLK_t:
+                        if (event.key.keysym.mod & MODIFIER) {
+                            pending_command = GB_SDL_TOGGLE_MODEL_COMMAND;
+                        }
+                        break;
+                    
+                    case SDLK_p:
+                        if (event.key.keysym.mod & MODIFIER) {
+                            paused = !paused;
+                        }
+                        break;
+                        
+                    case SDLK_m:
+                        if (event.key.keysym.mod & MODIFIER) {
+#ifdef __APPLE__
+                            // Can't override CMD+M (Minimize) in SDL
+                            if (!(event.key.keysym.mod & KMOD_SHIFT)) {
+                                break;
+                            }
+#endif
+                            SDL_PauseAudio(SDL_GetAudioStatus() == SDL_AUDIO_PLAYING? true : false);
+                        }
+                        break;
+                        
+                    case SDLK_TAB:
+                        cycle_scaling();
+                        break;
+#ifndef __APPLE__
+                    case SDLK_F1:
+                        SDL_ShowSimpleMessageBox(SDL_MESSAGEBOX_INFORMATION, "Help", help, window);
+                        break;
+#else
+                    case SDLK_SLASH:
+                        if (!(event.key.keysym.sym && (event.key.keysym.mod & KMOD_SHIFT))) {
+                            break;
+                        }
+                    case SDLK_QUESTION:
+                            SDL_ShowSimpleMessageBox(SDL_MESSAGEBOX_INFORMATION, "Help", help, window);
+#endif
+                        
+                    default:
+                        /* Save states */
+                        if (event.key.keysym.sym >= SDLK_0 && event.key.keysym.sym <= SDLK_9) {
+                            if (event.key.keysym.mod & MODIFIER) {
+                                command_parameter = event.key.keysym.sym - SDLK_0;
+                                
+                                if (event.key.keysym.mod & KMOD_SHIFT) {
+                                    pending_command = GB_SDL_LOAD_STATE_COMMAND;
+                                }
+                                else {
+                                    pending_command = GB_SDL_SAVE_STATE_COMMAND;
+                                }
+                            }
+                        }
+                        break;
+                }
+            case SDL_KEYUP: // Fallthrough
                 switch (event.key.keysym.sym) {
                     case SDLK_RIGHT:
                         GB_set_key_state(gb, GB_KEY_RIGHT, event.type == SDL_KEYDOWN);
@@ -65,51 +284,6 @@ static void GB_update_keys_status(GB_gameboy_t *gb)
                     case SDLK_SPACE:
                         GB_set_turbo_mode(gb, event.type == SDL_KEYDOWN, false);
                         break;
-                    case SDLK_LCTRL:
-                    case SDLK_RCTRL:
-                        ctrl = event.type == SDL_KEYDOWN;
-                        break;
-                    case SDLK_LSHIFT:
-                    case SDLK_RSHIFT:
-                        shift = event.type == SDL_KEYDOWN;
-                        break;
-#ifdef __APPLE__
-                    case SDLK_LMETA:
-                    case SDLK_RMETA:
-                        cmd = event.type == SDL_KEYDOWN;
-                        break;
-#endif
-
-                    case SDLK_c:
-                        if (ctrl && event.type == SDL_KEYDOWN) {
-                            ctrl = false;
-                            GB_debugger_break(gb);
-
-                        }
-                        break;
-
-                    default:
-                        /* Save states */
-                        if (event.key.keysym.sym >= SDLK_0 && event.key.keysym.sym <= SDLK_9) {
-#ifdef __APPLE__
-                            if (cmd) {
-#else
-                            if (ctrl) {
-#endif
-                                char save_path[strlen(filename) + 4];
-                                char save_extension[] =".s0";
-                                save_extension[2] += event.key.keysym.sym - SDLK_0;
-                                replace_extension(filename, strlen(filename), save_path, save_extension);
-
-                                if (shift) {
-                                    GB_load_state(gb, save_path);
-                                }
-                                else {
-                                    GB_save_state(gb, save_path);
-                                }
-                            }
-                        }
-                        break;
                 }
                 break;
             default:
@@ -120,68 +294,17 @@ static void GB_update_keys_status(GB_gameboy_t *gb)
 
 static void vblank(GB_gameboy_t *gb)
 {
-    SDL_Surface *screen = GB_get_user_data(gb);
+    SDL_UpdateTexture(texture, NULL, pixels, 160 * sizeof (uint32_t));
-    SDL_Flip(screen);
+    SDL_RenderClear(renderer);
-    GB_update_keys_status(gb);
+    SDL_RenderCopy(renderer, texture, NULL, NULL);
-
+    SDL_RenderPresent(renderer);
-    GB_set_pixels_output(gb, screen->pixels);
+    handle_events(gb);
 }
 
-#ifdef __APPLE__
-#include <mach-o/dyld.h>
-#endif
 
-static const char *executable_folder(void)
-{
-    static char path[1024] = {0,};
-    if (path[0]) {
-        return path;
-    }
-    /* Ugly unportable code! :( */
-#ifdef __APPLE__
-    unsigned int length = sizeof(path) - 1;
-    _NSGetExecutablePath(&path[0], &length);
-#else
-#ifdef __linux__
-    ssize_t length = readlink("/proc/self/exe", &path[0], sizeof(path) - 1);
-    assert (length != -1);
-#else
-#ifdef _WIN32
-    HMODULE hModule = GetModuleHandle(NULL);
-    GetModuleFileName(hModule, path, sizeof(path) - 1);
-#else
-    /* No OS-specific way, assume running from CWD */
-    getcwd(&path[0], sizeof(path) - 1);
-    return path;
-#endif
-#endif
-#endif
-    size_t pos = strlen(path);
-    while (pos) {
-        pos--;
-#ifdef _WIN32
-        if (path[pos] == '\\') {
-#else
-        if (path[pos] == '/') {
-#endif
-            path[pos] = 0;
-            break;
-        }
-    }
-    return path;
-}
-
-static char *executable_relative_path(const char *filename)
-{
-    static char path[1024];
-    snprintf(path, sizeof(path), "%s/%s", executable_folder(), filename);
-    return path;
-}
-
-static SDL_Surface *screen = NULL;
 static uint32_t rgb_encode(GB_gameboy_t *gb, uint8_t r, uint8_t g, uint8_t b)
 {
-    return SDL_MapRGB(screen->format, r, g, b);
+    return SDL_MapRGB(pixel_format, r, g, b);
 }
 
 static void debugger_interrupt(int ignore)
@@ -196,97 +319,91 @@ static void debugger_interrupt(int ignore)
 
 static void audio_callback(void *gb, Uint8 *stream, int len)
 {
+    if (GB_is_inited(gb)) {
         GB_apu_copy_buffer(gb, (GB_sample_t *) stream, len / sizeof(GB_sample_t));
-}
-
-static void replace_extension(const char *src, size_t length, char *dest, const char *ext)
-{
-    memcpy(dest, src, length);
-    dest[length] = 0;
-
-    /* Remove extension */
-    for (size_t i = length; i--;) {
-        if (dest[i] == '/') break;
-        if (dest[i] == '.') {
-            dest[i] = 0;
-            break;
-        }
-    }
-
-    /* Add new extension */
-    strcat(dest, ext);
-}
-
-#ifdef __APPLE__
-extern void cocoa_disable_filtering(void);
-#endif
-int main(int argc, char **argv)
-{
-    bool dmg = false;
-
-#define str(x) #x
-#define xstr(x) str(x)
-    fprintf(stderr, "SameBoy v" xstr(VERSION) "\n");
-
-    if (argc == 1 || argc > 3) {
-usage:
-        fprintf(stderr, "Usage: %s [--dmg] rom\n", argv[0]);
-        exit(1);
-    }
-
-    if (argc == 3) {
-        if (strcmp(argv[1], "--dmg") == 0) {
-            dmg = true;
     }
     else {
-            goto usage;
+        memset(stream, 0, len);
     }
+}
+    
+static bool handle_pending_command(void)
+{
+    switch (pending_command) {
+        case GB_SDL_LOAD_STATE_COMMAND:
+        case GB_SDL_SAVE_STATE_COMMAND: {
+            char save_path[strlen(filename) + 4];
+            char save_extension[] = ".s0";
+            save_extension[2] += command_parameter;
+            replace_extension(filename, strlen(filename), save_path, save_extension);
+            
+            start_capturing_logs();
+            if (pending_command == GB_SDL_LOAD_STATE_COMMAND) {
+                GB_load_state(&gb, save_path);
+            }
+            else {
+                GB_save_state(&gb, save_path);
+            }
+            end_capturing_logs(true, false);
+            return false;
         }
             
+        case GB_SDL_RESET_COMMAND:
+            GB_reset(&gb);
+            return false;
             
+        case GB_SDL_NO_COMMAND:
+            return false;
+            
+        case GB_SDL_NEW_FILE_COMMAND:
+            return true;
+            
+        case GB_SDL_TOGGLE_MODEL_COMMAND:
+            dmg = !dmg;
+            return true;
+    }
+    return false;
+}
+
+static void run(void)
+{
+restart:
+    if (GB_is_inited(&gb)) {
+        GB_switch_model_and_reset(&gb, !dmg);
+    }
+    else {
         if (dmg) {
             GB_init(&gb);
-        if (GB_load_boot_rom(&gb, executable_relative_path("dmg_boot.bin"))) {
-            perror("Failed to load boot ROM");
-            exit(1);
-        }
         }
         else {
             GB_init_cgb(&gb);
-        if (GB_load_boot_rom(&gb, executable_relative_path("cgb_boot.bin"))) {
-            perror("Failed to load boot ROM");
-            exit(1);
-        }
         }
         
-    filename = argv[argc - 1];
-
-    if (GB_load_rom(&gb, filename)) {
-        perror("Failed to load ROM");
-        exit(1);
-    }
-    
-
-    signal(SIGINT, debugger_interrupt);
-
-    SDL_Init( SDL_INIT_EVERYTHING );
-    screen = SDL_SetVideoMode(160, 144, 32, SDL_SWSURFACE );
-    SDL_WM_SetCaption("SameBoy v" xstr(VERSION), "SameBoy v" xstr(VERSION));
-#ifdef __APPLE__
-    cocoa_disable_filtering();
-#endif
-    /* Configure Screen */
-    SDL_LockSurface(screen);
         GB_set_vblank_callback(&gb, (GB_vblank_callback_t) vblank);
-    GB_set_user_data(&gb, screen);
+        GB_set_pixels_output(&gb, pixels);
-    GB_set_pixels_output(&gb, screen->pixels);
         GB_set_rgb_encode_callback(&gb, rgb_encode);
+        GB_set_sample_rate(&gb, have_aspec.freq);
+    }
+    
+    start_capturing_logs();
+    if (dmg) {
+        GB_load_boot_rom(&gb, executable_relative_path("dmg_boot.bin"));
+    }
+    else {
+        GB_load_boot_rom(&gb, executable_relative_path("cgb_boot.bin"));
+    }
+    end_capturing_logs(true, true);
+    
+    start_capturing_logs();
+    GB_load_rom(&gb, filename);
+    end_capturing_logs(true, true);
     
     size_t path_length = strlen(filename);
     
     /* Configure battery */
     char battery_save_path[path_length + 5]; /* At the worst case, size is strlen(path) + 4 bytes for .sav + NULL */
     replace_extension(filename, path_length, battery_save_path, ".sav");
+    battery_save_path_ptr = battery_save_path;
     GB_load_battery(&gb, battery_save_path);
     
     /* Configure symbols */
@@ -296,29 +413,136 @@ usage:
     replace_extension(filename, path_length, symbols_path, ".sym");
     GB_debugger_load_symbol_file(&gb, symbols_path);
     
-    /* Configure Audio */
-    SDL_AudioSpec want, have;
-    SDL_memset(&want, 0, sizeof(want));
-    want.freq = AUDIO_FREQUENCY;
-    want.format = AUDIO_S16SYS;
-    want.channels = 2;
-    want.samples = 512;
-    want.callback = audio_callback;
-    want.userdata = &gb;
-    SDL_OpenAudio(&want, &have);
-    GB_set_sample_rate(&gb, AUDIO_FREQUENCY);
-    
-    /* Start Audio */
-    SDL_PauseAudio(0);
-
     /* Run emulation */
-    running = true;
+    while (true) {
-    while (running) {
+        if (paused) {
+            SDL_WaitEvent(NULL);
+            handle_events(&gb);
+        }
+        else {
             GB_run(&gb);
         }
-    SDL_CloseAudio();
         
-    GB_save_battery(&gb, battery_save_path);
+        /* These commands can't run in the handle_event function, because they're not safe in a vblank context. */
-    return 0;
+        if (handle_pending_command()) {
+            pending_command = GB_SDL_NO_COMMAND;
+            goto restart;
+        }
+        pending_command = GB_SDL_NO_COMMAND;
+    }
 }
     
+int main(int argc, char **argv)
+{
+#define str(x) #x
+#define xstr(x) str(x)
+    fprintf(stderr, "SameBoy v" xstr(VERSION) "\n");
+
+    if (argc > 3) {
+usage:
+        fprintf(stderr, "Usage: %s [--dmg] [rom]\n", argv[0]);
+        exit(1);
+    }
+    
+    for (unsigned i = 1; i < argc; i++) {
+        if (strcmp(argv[i], "--dmg") == 0) {
+            if (dmg) {
+                goto usage;
+            }
+            dmg = true;
+        }
+        else if (!filename) {
+            filename = argv[i];
+        }
+        else {
+            goto usage;
+        }
+    }
+
+    signal(SIGINT, debugger_interrupt);
+
+    SDL_Init( SDL_INIT_EVERYTHING );
+    
+    window = SDL_CreateWindow("SameBoy v" xstr(VERSION), SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED,
+                              160 * 2, 144 * 2, SDL_WINDOW_OPENGL | SDL_WINDOW_RESIZABLE);
+    SDL_SetWindowMinimumSize(window, 160, 144);
+    renderer = SDL_CreateRenderer(window, -1, 0);
+    
+    texture = SDL_CreateTexture(renderer, SDL_GetWindowPixelFormat(window), SDL_TEXTUREACCESS_STREAMING, 160, 144);
+    
+    pixel_format = SDL_AllocFormat(SDL_GetWindowPixelFormat(window));
+
+    /* Configure Audio */
+    memset(&want_aspec, 0, sizeof(want_aspec));
+    want_aspec.freq = AUDIO_FREQUENCY;
+    want_aspec.format = AUDIO_S16SYS;
+    want_aspec.channels = 2;
+#if SDL_COMPILEDVERSION == 2005 && defined(__APPLE__)
+    /* SDL 2.0.5 on macOS introduced a bug where certain combinations of buffer lengths and frequencies 
+       fail to produce audio correctly. This bug was fixed 2.0.6. */
+    want_aspec.samples = 2048;
+#else
+    want_aspec.samples = 512;
+#endif
+    want_aspec.callback = audio_callback;
+    want_aspec.userdata = &gb;
+    SDL_OpenAudio(&want_aspec, &have_aspec);
+    
+    /* Start Audio */
+    SDL_PauseAudio(false);
+
+    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;
+            }
+        }
+    }
+start:
+    run(); // Never returns
+    return 0;
+}

SDL/utils.c

@@ -0,0 +1,76 @@
+#include <stdio.h>
+#include <string.h>
+#ifdef __APPLE__
+#include <mach-o/dyld.h>
+#endif
+#ifdef _WIN32
+#include <direct.h>
+#include <windows.h>
+#endif
+#include "utils.h"
+
+const char *executable_folder(void)
+{
+    static char path[1024] = {0,};
+    if (path[0]) {
+        return path;
+    }
+    /* Ugly unportable code! :( */
+#ifdef __APPLE__
+    unsigned int length = sizeof(path) - 1;
+    _NSGetExecutablePath(&path[0], &length);
+#else
+#ifdef __linux__
+    ssize_t length = readlink("/proc/self/exe", &path[0], sizeof(path) - 1);
+    assert (length != -1);
+#else
+#ifdef _WIN32
+    HMODULE hModule = GetModuleHandle(NULL);
+    GetModuleFileName(hModule, path, sizeof(path) - 1);
+#else
+    /* No OS-specific way, assume running from CWD */
+    getcwd(&path[0], sizeof(path) - 1);
+    return path;
+#endif
+#endif
+#endif
+    size_t pos = strlen(path);
+    while (pos) {
+        pos--;
+#ifdef _WIN32
+        if (path[pos] == '\\') {
+#else
+        if (path[pos] == '/') {
+#endif
+            path[pos] = 0;
+            break;
+        }
+    }
+    return path;
+}
+
+char *executable_relative_path(const char *filename)
+{
+    static char path[1024];
+    snprintf(path, sizeof(path), "%s/%s", executable_folder(), filename);
+    return path;
+}
+
+    
+void replace_extension(const char *src, size_t length, char *dest, const char *ext)
+{
+    memcpy(dest, src, length);
+    dest[length] = 0;
+    
+    /* Remove extension */
+    for (size_t i = length; i--;) {
+        if (dest[i] == '/') break;
+        if (dest[i] == '.') {
+            dest[i] = 0;
+            break;
+        }
+    }
+    
+    /* Add new extension */
+    strcat(dest, ext);
+}

SDL/utils.h

@@ -0,0 +1,8 @@
+#ifndef utils_h
+#define utils_h
+
+const char *executable_folder(void);
+char *executable_relative_path(const char *filename);
+void replace_extension(const char *src, size_t length, char *dest, const char *ext);
+
+#endif /* utils_h */

Windows/math.h

@@ -0,0 +1,7 @@
+#pragma once
+#include_next <math.h>
+/* "Old" (Pre-2015) Windows headers/libc don't have round. */
+static inline double round(double f)
+{
+    return f >= 0? (int)(f + 0.5) : (int)(f - 0.5);
+}

Windows/stdint.h

@@ -0,0 +1,3 @@
+#pragma once
+#include_next <stdint.h>
+typedef intptr_t ssize_t;

Windows/stdio.h

@@ -67,3 +67,5 @@ static inline size_t getline(char **lineptr, size_t *n, FILE *stream) {
 
     return p - bufptr - 1;
 }
+
+#define snprintf _snprintf

Windows/string.h

@@ -0,0 +1,3 @@
+#pragma once
+#include_next <string.h>
+#define strdup _strdup