Let the core handle boot ROM selection

Cocoa/Document.m

@@ -74,8 +74,15 @@ enum model {
           topMargin:(unsigned) topMargin bottomMargin: (unsigned) bottomMargin
            exposure:(unsigned) exposure;
 - (void) gotNewSample:(GB_sample_t *)sample;
+- (void) loadBootROM:(GB_boot_rom_t)type;
 @end
 
+static void boot_rom_load(GB_gameboy_t *gb, GB_boot_rom_t type)
+{
+    Document *self = (__bridge Document *)GB_get_user_data(gb);
+    [self loadBootROM: type];
+}
+
 static void vblank(GB_gameboy_t *gb)
 {
     Document *self = (__bridge Document *)GB_get_user_data(gb);
@@ -209,6 +216,7 @@ static void audioCallback(GB_gameboy_t *gb, GB_sample_t *sample)
 {
     GB_init(&gb, [self internalModel]);
     GB_set_user_data(&gb, (__bridge void *)(self));
+    GB_set_boot_rom_load_callback(&gb, (GB_boot_rom_load_callback_t)boot_rom_load);
     GB_set_vblank_callback(&gb, (GB_vblank_callback_t) vblank);
     GB_set_log_callback(&gb, (GB_log_callback_t) consoleLog);
     GB_set_input_callback(&gb, (GB_input_callback_t) consoleInput);
@@ -340,15 +348,19 @@ static void audioCallback(GB_gameboy_t *gb, GB_sample_t *sample)
     GB_debugger_set_disabled(&gb, false);
 }
 
-- (void) loadBootROM
+- (void) loadBootROM: (GB_boot_rom_t)type
 {
-    static NSString * const boot_names[] = {@"dmg_boot", @"cgb_boot", @"agb_boot", @"sgb_boot"};
-    if ([self internalModel] == GB_MODEL_SGB2) {
-        GB_load_boot_rom(&gb, [[self bootROMPathForName:@"sgb2_boot"] UTF8String]);
-    }
-    else {
-        GB_load_boot_rom(&gb, [[self bootROMPathForName:boot_names[current_model - 1]] UTF8String]);
-    }
+    static NSString *const names[] = {
+        [GB_BOOT_ROM_DMG0] = @"dmg0_boot",
+        [GB_BOOT_ROM_DMG] = @"dmg_boot",
+        [GB_BOOT_ROM_MGB] = @"mgb_boot",
+        [GB_BOOT_ROM_SGB] = @"sgb_boot",
+        [GB_BOOT_ROM_SGB2] = @"sgb2_boot",
+        [GB_BOOT_ROM_CGB0] = @"cgb0_boot",
+        [GB_BOOT_ROM_CGB] = @"cgb_boot",
+        [GB_BOOT_ROM_AGB] = @"agb_boot",
+    };
+    GB_load_boot_rom(&gb, [[self bootROMPathForName:names[type]] UTF8String]);
 }
 
 - (IBAction)reset:(id)sender
@@ -360,8 +372,6 @@ static void audioCallback(GB_gameboy_t *gb, GB_sample_t *sample)
         current_model = (enum model)[sender tag];
     }
     
-    [self loadBootROM];
-    
     if (!modelsChanging && [sender tag] == MODEL_NONE) {
         GB_reset(&gb);
     }

Core/gb.c

@@ -878,6 +878,36 @@ static void reset_ram(GB_gameboy_t *gb)
     }
 }
 
+static void request_boot_rom(GB_gameboy_t *gb)
+{
+    if (gb->boot_rom_load_callback) {
+        GB_boot_rom_t type = 0;
+        switch (gb->model) {
+            case GB_MODEL_DMG_B:
+                type = GB_BOOT_ROM_DMG;
+                break;
+            case GB_MODEL_SGB_NTSC:
+            case GB_MODEL_SGB_PAL:
+            case GB_MODEL_SGB_NTSC_NO_SFC:
+            case GB_MODEL_SGB_PAL_NO_SFC:
+                type = GB_BOOT_ROM_SGB;
+                break;
+            case GB_MODEL_SGB2:
+            case GB_MODEL_SGB2_NO_SFC:
+                type = GB_BOOT_ROM_SGB2;
+                break;
+            case GB_MODEL_CGB_C:
+            case GB_MODEL_CGB_E:
+                type = GB_BOOT_ROM_CGB;
+                break;
+            case GB_MODEL_AGB:
+                type = GB_BOOT_ROM_AGB;
+                break;
+        }
+        gb->boot_rom_load_callback(gb, type);
+    }
+}
+
 void GB_reset(GB_gameboy_t *gb)
 {
     uint32_t mbc_ram_size = gb->mbc_ram_size;
@@ -948,6 +978,7 @@ void GB_reset(GB_gameboy_t *gb)
     }
     
     gb->magic = state_magic();
+    request_boot_rom(gb);
 }
 
 void GB_switch_model_and_reset(GB_gameboy_t *gb, GB_model_t model)
@@ -1093,3 +1124,9 @@ void GB_set_icd_vreset_callback(GB_gameboy_t *gb, GB_icd_vreset_callback_t callb
 {
     gb->icd_vreset_callback = callback;
 }
+
+void GB_set_boot_rom_load_callback(GB_gameboy_t *gb, GB_boot_rom_load_callback_t callback)
+{
+    gb->boot_rom_load_callback = callback;
+    request_boot_rom(gb);
+}

Core/gb.h

@@ -229,6 +229,17 @@ typedef enum {
     GB_LOG_UNDERLINE_MASK =  GB_LOG_DASHED_UNDERLINE | GB_LOG_UNDERLINE
 } GB_log_attributes;
 
+typedef enum {
+    GB_BOOT_ROM_DMG0,
+    GB_BOOT_ROM_DMG,
+    GB_BOOT_ROM_MGB,
+    GB_BOOT_ROM_SGB,
+    GB_BOOT_ROM_SGB2,
+    GB_BOOT_ROM_CGB0,
+    GB_BOOT_ROM_CGB,
+    GB_BOOT_ROM_AGB,
+} GB_boot_rom_t;
+
 #ifdef GB_INTERNAL
 #define LCDC_PERIOD 70224
 #define CPU_FREQUENCY 0x400000
@@ -259,6 +270,7 @@ typedef void (*GB_joyp_write_callback_t)(GB_gameboy_t *gb, uint8_t value);
 typedef void (*GB_icd_pixel_callback_t)(GB_gameboy_t *gb, uint8_t row);
 typedef void (*GB_icd_hreset_callback_t)(GB_gameboy_t *gb);
 typedef void (*GB_icd_vreset_callback_t)(GB_gameboy_t *gb);
+typedef void (*GB_boot_rom_load_callback_t)(GB_gameboy_t *gb, GB_boot_rom_t type);
 
 typedef struct {
     bool state;
@@ -553,6 +565,7 @@ struct GB_gameboy_internal_s {
         GB_icd_vreset_callback_t icd_hreset_callback;
         GB_icd_vreset_callback_t icd_vreset_callback;
         GB_read_memory_callback_t read_memory_callback;
+        GB_boot_rom_load_callback_t boot_rom_load_callback;
                
         /* IR */
         long cycles_since_ir_change; // In 8MHz units
@@ -706,7 +719,9 @@ void GB_set_rgb_encode_callback(GB_gameboy_t *gb, GB_rgb_encode_callback_t callb
 void GB_set_infrared_callback(GB_gameboy_t *gb, GB_infrared_callback_t callback);
 void GB_set_rumble_callback(GB_gameboy_t *gb, GB_rumble_callback_t callback);
 void GB_set_update_input_hint_callback(GB_gameboy_t *gb, GB_update_input_hint_callback_t callback);
-
+/* Called when a new boot ROM is needed. The callback should call GB_load_boot_rom or GB_load_boot_rom_from_buffer */
+void GB_set_boot_rom_load_callback(GB_gameboy_t *gb, GB_boot_rom_load_callback_t callback);
+    
 void GB_set_palette(GB_gameboy_t *gb, const GB_palette_t *palette);
 
 /* These APIs are used when using internal clock */

SDL/main.c

@@ -445,6 +445,24 @@ static bool handle_pending_command(void)
     return false;
 }
 
+static void load_boot_rom(GB_gameboy_t *gb, GB_boot_rom_t type)
+{
+    bool error = false;
+    start_capturing_logs();
+    static const char *const names[] = {
+        [GB_BOOT_ROM_DMG0] = "dmg0_boot.bin",
+        [GB_BOOT_ROM_DMG] = "dmg_boot.bin",
+        [GB_BOOT_ROM_MGB] = "mgb_boot.bin",
+        [GB_BOOT_ROM_SGB] = "sgb_boot.bin",
+        [GB_BOOT_ROM_SGB2] = "sgb2_boot.bin",
+        [GB_BOOT_ROM_CGB0] = "cgb0_boot.bin",
+        [GB_BOOT_ROM_CGB] = "cgb_boot.bin",
+        [GB_BOOT_ROM_AGB] = "agb_boot.bin",
+    };
+    GB_load_boot_rom(gb, resource_path(names[type]));
+    end_capturing_logs(true, error);
+}
+
 static void run(void)
 {
     SDL_ShowCursor(SDL_DISABLE);
@@ -470,6 +488,7 @@ restart:
     else {
         GB_init(&gb, model);
         
+        GB_set_boot_rom_load_callback(&gb, load_boot_rom);
         GB_set_vblank_callback(&gb, (GB_vblank_callback_t) vblank);
         GB_set_pixels_output(&gb, active_pixel_buffer);
         GB_set_rgb_encode_callback(&gb, rgb_encode);
@@ -490,15 +509,6 @@ restart:
 
     
     bool error = false;
-    start_capturing_logs();
-    const char * const boot_roms[] = {"dmg_boot.bin", "cgb_boot.bin", "agb_boot.bin", "sgb_boot.bin"};
-    const char *boot_rom = boot_roms[configuration.model];
-    if (configuration.model == MODEL_SGB && configuration.sgb_revision == SGB_2) {
-        boot_rom = "sgb2_boot.bin";
-    }
-    error = GB_load_boot_rom(&gb, resource_path(boot_rom));
-    end_capturing_logs(true, error);
-    
     start_capturing_logs();
     error = GB_load_rom(&gb, filename);
     end_capturing_logs(true, error);