Merge bsnes’s changes

Core/gb.c

@@ -251,6 +251,48 @@ typedef union {
     } vba64;
 } GB_rtc_save_t;
 
+int GB_save_battery_size(GB_gameboy_t *gb)
+{
+    if (!gb->cartridge_type->has_battery) return 0; // Nothing to save.
+    if (gb->mbc_ram_size == 0 && !gb->cartridge_type->has_rtc) return 0; /* Claims to have battery, but has no RAM or RTC */
+
+    GB_rtc_save_t rtc_save_size;
+    return gb->mbc_ram_size + (gb->cartridge_type->has_rtc ? sizeof(rtc_save_size.vba64) : 0);
+}
+
+int GB_save_battery_to_buffer(GB_gameboy_t *gb, uint8_t *buffer, size_t size)
+{
+    if (!gb->cartridge_type->has_battery) return 0; // Nothing to save.
+    if (gb->mbc_ram_size == 0 && !gb->cartridge_type->has_rtc) return 0; /* Claims to have battery, but has no RAM or RTC */
+
+    if (size < GB_save_battery_size(gb)) return EIO;
+
+    memcpy(buffer, gb->mbc_ram, gb->mbc_ram_size);
+
+    if (gb->cartridge_type->has_rtc) {
+        GB_rtc_save_t rtc_save = {{{{0,}},},};
+        rtc_save.vba64.rtc_real.seconds = gb->rtc_real.seconds;
+        rtc_save.vba64.rtc_real.minutes = gb->rtc_real.minutes;
+        rtc_save.vba64.rtc_real.hours = gb->rtc_real.hours;
+        rtc_save.vba64.rtc_real.days = gb->rtc_real.days;
+        rtc_save.vba64.rtc_real.high = gb->rtc_real.high;
+        rtc_save.vba64.rtc_latched.seconds = gb->rtc_latched.seconds;
+        rtc_save.vba64.rtc_latched.minutes = gb->rtc_latched.minutes;
+        rtc_save.vba64.rtc_latched.hours = gb->rtc_latched.hours;
+        rtc_save.vba64.rtc_latched.days = gb->rtc_latched.days;
+        rtc_save.vba64.rtc_latched.high = gb->rtc_latched.high;
+#ifdef GB_BIG_ENDIAN
+        rtc_save.vba64.last_rtc_second = __builtin_bswap64(gb->last_rtc_second);
+#else
+        rtc_save.vba64.last_rtc_second = gb->last_rtc_second;
+#endif
+        memcpy(buffer + gb->mbc_ram_size, &rtc_save.vba64, sizeof(rtc_save.vba64));
+    }
+
+    errno = 0;
+    return errno;
+}
+
 int GB_save_battery(GB_gameboy_t *gb, const char *path)
 {
     if (!gb->cartridge_type->has_battery) return 0; // Nothing to save.
@@ -294,6 +336,79 @@ int GB_save_battery(GB_gameboy_t *gb, const char *path)
     return errno;
 }
 
+void GB_load_battery_from_buffer(GB_gameboy_t *gb, const uint8_t *buffer, size_t size)
+{
+    memcpy(gb->mbc_ram, buffer, MIN(gb->mbc_ram_size, size));
+    if (size <= gb->mbc_ram_size) {
+        goto reset_rtc;
+    }
+
+    GB_rtc_save_t rtc_save;
+    memcpy(&rtc_save, buffer + gb->mbc_ram_size, MIN(sizeof(rtc_save), size));
+    switch (size - gb->mbc_ram_size) {
+        case sizeof(rtc_save.sameboy_legacy):
+            memcpy(&gb->rtc_real, &rtc_save.sameboy_legacy.rtc_real, sizeof(gb->rtc_real));
+            memcpy(&gb->rtc_latched, &rtc_save.sameboy_legacy.rtc_real, sizeof(gb->rtc_real));
+            gb->last_rtc_second = rtc_save.sameboy_legacy.last_rtc_second;
+            break;
+            
+        case sizeof(rtc_save.vba32):
+            gb->rtc_real.seconds = rtc_save.vba32.rtc_real.seconds;
+            gb->rtc_real.minutes = rtc_save.vba32.rtc_real.minutes;
+            gb->rtc_real.hours = rtc_save.vba32.rtc_real.hours;
+            gb->rtc_real.days = rtc_save.vba32.rtc_real.days;
+            gb->rtc_real.high = rtc_save.vba32.rtc_real.high;
+            gb->rtc_latched.seconds = rtc_save.vba32.rtc_latched.seconds;
+            gb->rtc_latched.minutes = rtc_save.vba32.rtc_latched.minutes;
+            gb->rtc_latched.hours = rtc_save.vba32.rtc_latched.hours;
+            gb->rtc_latched.days = rtc_save.vba32.rtc_latched.days;
+            gb->rtc_latched.high = rtc_save.vba32.rtc_latched.high;
+#ifdef GB_BIG_ENDIAN
+            gb->last_rtc_second = __builtin_bswap32(rtc_save.vba32.last_rtc_second);
+#else
+            gb->last_rtc_second = rtc_save.vba32.last_rtc_second;
+#endif
+            break;
+            
+        case sizeof(rtc_save.vba64):
+            gb->rtc_real.seconds = rtc_save.vba64.rtc_real.seconds;
+            gb->rtc_real.minutes = rtc_save.vba64.rtc_real.minutes;
+            gb->rtc_real.hours = rtc_save.vba64.rtc_real.hours;
+            gb->rtc_real.days = rtc_save.vba64.rtc_real.days;
+            gb->rtc_real.high = rtc_save.vba64.rtc_real.high;
+            gb->rtc_latched.seconds = rtc_save.vba64.rtc_latched.seconds;
+            gb->rtc_latched.minutes = rtc_save.vba64.rtc_latched.minutes;
+            gb->rtc_latched.hours = rtc_save.vba64.rtc_latched.hours;
+            gb->rtc_latched.days = rtc_save.vba64.rtc_latched.days;
+            gb->rtc_latched.high = rtc_save.vba64.rtc_latched.high;
+#ifdef GB_BIG_ENDIAN
+            gb->last_rtc_second = __builtin_bswap64(rtc_save.vba64.last_rtc_second);
+#else
+            gb->last_rtc_second = rtc_save.vba64.last_rtc_second;
+#endif
+            break;
+            
+        default:
+            goto reset_rtc;
+    }
+    if (gb->last_rtc_second > time(NULL)) {
+        /* We must reset RTC here, or it will not advance. */
+        goto reset_rtc;
+    }
+
+    if (gb->last_rtc_second < 852076800) { /* 1/1/97. There weren't any RTC games that time,
+                                            so if the value we read is lower it means it wasn't
+                                            really RTC data. */
+        goto reset_rtc;
+    }
+    goto exit;
+reset_rtc:
+    gb->last_rtc_second = time(NULL);
+    gb->rtc_real.high |= 0x80; /* This gives the game a hint that the clock should be reset. */
+exit:
+    return;
+}
+
 /* Loading will silently stop if the format is incomplete */
 void GB_load_battery(GB_gameboy_t *gb, const char *path)
 {

Core/gb.h

@@ -1,5 +1,6 @@
 #ifndef GB_h
 #define GB_h
+#define typeof __typeof__
 #include <stdbool.h>
 #include <stdint.h>
 #include <time.h>
@@ -542,6 +543,7 @@ struct GB_gameboy_internal_s {
         GB_icd_pixel_callback_t icd_pixel_callback;
         GB_icd_vreset_callback_t icd_hreset_callback;
         GB_icd_vreset_callback_t icd_vreset_callback;
+        GB_read_memory_callback_t read_memory_callback;
                
         /* IR */
         long cycles_since_ir_change; // In 8MHz units
@@ -669,7 +671,11 @@ void GB_load_boot_rom_from_buffer(GB_gameboy_t *gb, const unsigned char *buffer,
 int GB_load_rom(GB_gameboy_t *gb, const char *path);
 void GB_load_rom_from_buffer(GB_gameboy_t *gb, const uint8_t *buffer, size_t size);
 
+int GB_save_battery_size(GB_gameboy_t *gb);
+int GB_save_battery_to_buffer(GB_gameboy_t *gb, uint8_t *buffer, size_t size);
 int GB_save_battery(GB_gameboy_t *gb, const char *path);
+
+void GB_load_battery_from_buffer(GB_gameboy_t *gb, const uint8_t *buffer, size_t size);
 void GB_load_battery(GB_gameboy_t *gb, const char *path);
 
 void GB_set_turbo_mode(GB_gameboy_t *gb, bool on, bool no_frame_skip);

Core/memory.c

@@ -429,6 +429,11 @@ uint8_t GB_read_memory(GB_gameboy_t *gb, uint16_t addr)
     if (is_addr_in_dma_use(gb, addr)) {
         addr = gb->dma_current_src;
     }
+    if (gb->read_memory_callback) {
+        uint8_t data = read_map[addr >> 12](gb, addr);
+        data = gb->read_memory_callback(gb, addr, data);
+        return data;
+    }
     return read_map[addr >> 12](gb, addr);
 }
 

Core/memory.h

@@ -3,6 +3,9 @@
 #include "gb_struct_def.h"
 #include <stdint.h>
 
+typedef uint8_t (*GB_read_memory_callback_t)(GB_gameboy_t *gb, uint16_t addr, uint8_t data);
+void GB_set_read_memory_callback(GB_gameboy_t *gb, GB_read_memory_callback_t callback);
+
 uint8_t GB_read_memory(GB_gameboy_t *gb, uint16_t addr);
 void GB_write_memory(GB_gameboy_t *gb, uint16_t addr, uint8_t value);
 #ifdef GB_INTERNAL

Core/sgb.c

@@ -3,6 +3,10 @@
 #include <math.h>
 #include <assert.h>
 
+#ifndef M_PI
+  #define M_PI 3.14159265358979323846
+#endif
+
 #define INTRO_ANIMATION_LENGTH 200
 
 enum {

Core/timing.c

@@ -3,7 +3,7 @@
 #ifndef _WIN32_WINNT
 #define _WIN32_WINNT 0x0500
 #endif
-#include <Windows.h>
+#include <windows.h>
 #else
 #include <sys/time.h>
 #endif