From 2c1fcf96915523fa527fb97df672c1b70f43962b Mon Sep 17 00:00:00 2001
From: CasualPokePlayer <50538166+CasualPokePlayer@users.noreply.github.com>
Date: Sat, 28 Sep 2024 08:55:21 -0700
Subject: [PATCH] Fix savestates not writing back GPIO variables to gpioBase

Resolves #3294

Also see https://github.com/TASEmulators/BizHawk/issues/4060 (this is fixed with this patch).
---
 src/gba/cart/gpio.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/src/gba/cart/gpio.c b/src/gba/cart/gpio.c
index fde4e3714..15f082849 100644
--- a/src/gba/cart/gpio.c
+++ b/src/gba/cart/gpio.c
@@ -465,6 +465,18 @@ void GBAHardwareSerialize(const struct GBACartridgeHardware* hw, struct GBASeria
 	STORE_16(hw->direction, 0, &state->hw.pinDirection);
 	state->hw.devices = hw->devices;
 
+	if (hw->gpioBase) {
+		if (hw->readWrite) {
+			STORE_16(hw->pinState, 0, hw->gpioBase);
+			STORE_16(hw->direction, 2, hw->gpioBase);
+			STORE_16(hw->readWrite, 4, hw->gpioBase);
+		} else {
+			hw->gpioBase[0] = 0;
+			hw->gpioBase[1] = 0;
+			hw->gpioBase[2] = 0;
+		}
+	}
+
 	STORE_32(hw->rtc.bytesRemaining, 0, &state->hw.rtcBytesRemaining);
 	STORE_32(hw->rtc.transferStep, 0, &state->hw.rtcTransferStep);
 	STORE_32(hw->rtc.bitsRead, 0, &state->hw.rtcBitsRead);