Detect Perfect Dark GBC Rom, emulating Transfer Pak functionality.

fgsfdsfgs · Aug 25, 2024 · 153ca33 · 153ca33
1 parent bdbf0ab
commit 153ca33
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Showing 5 changed files with 59 additions and 0 deletions.
diff --git a/port/include/romdata.h b/port/include/romdata.h
@@ -22,4 +22,6 @@ u8 *romdataSegGetData(const char *segName);
 u8 *romdataSegGetDataEnd(const char *segName);
 u32 romdataSegGetSize(const char *segName);
 
+void gbcRomCheck(void);
+
 #endif
diff --git a/port/src/main.c b/port/src/main.c
@@ -107,6 +107,7 @@ int main(int argc, const char **argv)
 	inputInit();
 	audioInit();
 	romdataInit();
+	gbcRomCheck();
 
 	gameInit();
 

diff --git a/port/src/romdata.c b/port/src/romdata.c
@@ -11,6 +11,9 @@
 #include "system.h"
 #include "preprocess.h"
 #include "platform.h"
+#ifndef PLATFORM_N64
+#include "bss.h"
+#endif
 
 /**
  * asset files and ROM segments can be replaced by optional external files,
@@ -51,6 +54,9 @@
 
 #define ROMDATA_MAX_FILES 2048
 
+#define GBC_ROM_NAME "pd.gbc"
+#define GBC_ROM_SIZE 4194304
+
 u8 *g_RomFile;
 u32 g_RomFileSize;
 
@@ -386,6 +392,45 @@ s32 romdataInit(void)
 	return 0;
 }
 
+void gbcRomCheck(void)
+{
+	u32 gbcRomSize;
+	u8* gbcRomFile = fsFileLoad(GBC_ROM_NAME, &gbcRomSize);
+
+	if (!gbcRomFile) {
+		return;
+	}
+
+	if (gbcRomSize != GBC_ROM_SIZE) {
+		free(gbcRomFile);
+		return;
+	}
+
+	// ROM title
+
+	if (memcmp(gbcRomFile + 0x134, "PerfDark   VPDE", 15) != 0) {
+		free(gbcRomFile);
+		return;
+	}
+
+	// Licensee code
+
+	if (memcmp(gbcRomFile + 0x144, "4Y", 2) != 0) {
+		free(gbcRomFile);
+		return;
+	}
+
+	// Header and global checksums
+
+	if (gbcRomFile[0x14D] != 0xA1 || gbcRomFile[0x14E] != 0xAD || gbcRomFile[0x14F] != 0x0F) {
+		free(gbcRomFile);
+		return;
+	}
+
+	g_validGbcRomFound = true;
+	free(gbcRomFile);
+}
+
 s32 romdataFileGetSize(s32 fileNum)
 {
 	if (fileNum < 1 || fileNum >= ROMDATA_MAX_FILES) {

diff --git a/src/game/pak.c b/src/game/pak.c
@@ -329,6 +329,10 @@ u8 g_PaksPlugged = 0;
 bool var80075d14 = true;
 #endif
 
+#ifndef PLATFORM_N64
+bool g_validGbcRomFound = false;
+#endif
+
 u32 pakGetBlockSize(s8 device)
 {
 	return device == SAVEDEVICE_GAMEPAK ? 0x10 : 0x20;
@@ -5982,6 +5986,7 @@ s32 pak0f11e750(s8 device)
 
 bool gbpakIsAnyPerfectDark(void)
 {
+#ifdef PLATFORM_N64
 	s8 i;
 
 	for (i = 0; i < MAX_PLAYERS; i++) {
@@ -5991,6 +5996,9 @@ bool gbpakIsAnyPerfectDark(void)
 	}
 
 	return false;
+#else
+	return g_validGbcRomFound;
+#endif
 }
 
 /**

diff --git a/src/include/bss.h b/src/include/bss.h
@@ -293,5 +293,8 @@ extern struct bossfile g_BossFile;
 extern struct chrdata *g_MpBotChrPtrs[MAX_BOTS];
 extern s32 g_JpnMaxCacheItems;
 extern s32 var8009d370jf;
+#ifndef PLATFORM_N64
+extern bool g_validGbcRomFound;
+#endif
 
 #endif