From 1b591888c4aec568da64ea2897e9ad8bbf33cea1 Mon Sep 17 00:00:00 2001
From: notaz <notasas@gmail.com>
Date: Wed, 6 Sep 2023 23:47:23 +0300
Subject: [PATCH] some lightgun selection mechanism

---
 frontend/libretro.c         | 4 ++++
 frontend/plugin_lib.c       | 4 ++++
 include/psemu_plugin_defs.h | 4 +++-
 libpcsxcore/plugins.c       | 8 ++++++++
 plugins/dfinput/externals.h | 1 +
 5 files changed, 20 insertions(+), 1 deletion(-)

diff --git a/frontend/libretro.c b/frontend/libretro.c
index 32d27f5d..b64c3cae 100644
--- a/frontend/libretro.c
+++ b/frontend/libretro.c
@@ -518,6 +518,10 @@ void pl_update_gun(int *xn, int *yn, int *xres, int *yres, int *in)
 {
 }
 
+void pl_gun_byte2(int port, unsigned char byte)
+{
+}
+
 /* sound calls */
 static void snd_feed(void *buf, int bytes)
 {
diff --git a/frontend/plugin_lib.c b/frontend/plugin_lib.c
index bdf09c71..2a417a4d 100644
--- a/frontend/plugin_lib.c
+++ b/frontend/plugin_lib.c
@@ -634,6 +634,10 @@ void pl_update_gun(int *xn, int *yn, int *xres, int *yres, int *in)
 	*yres = psx_h;
 }
 
+void pl_gun_byte2(int port, unsigned char byte)
+{
+}
+
 #define MAX_LAG_FRAMES 3
 
 #define tvdiff(tv, tv_old) \
diff --git a/include/psemu_plugin_defs.h b/include/psemu_plugin_defs.h
index b855eacc..8645eab7 100644
--- a/include/psemu_plugin_defs.h
+++ b/include/psemu_plugin_defs.h
@@ -222,7 +222,9 @@ typedef struct
 	
 	//configuration mode Request 0x43
 	int configMode;
-	unsigned char reserved[87];
+
+	unsigned char txData[32];
+	unsigned char reserved[56];
 	
 	//Lightgun values 
 	int absoluteX,absoluteY;
diff --git a/libpcsxcore/plugins.c b/libpcsxcore/plugins.c
index 6886a6a0..4516b5ce 100644
--- a/libpcsxcore/plugins.c
+++ b/libpcsxcore/plugins.c
@@ -745,10 +745,18 @@ unsigned char _PADpoll(int port, unsigned char value) {
 		}
 	}
 
+	if (reqPos < sizeof(pad[port].txData))
+		pad[port].txData[reqPos] = value;
+
 	//if no new request the pad return 0xff, for signaling connected
 	if (reqPos >= respSize)
 		return 0xff;
 
+	if (in_type[port] == PSE_PAD_TYPE_GUN) {
+		if (reqPos == 2)
+			pl_gun_byte2(port, value);
+	}
+	else
 	switch(reqPos){
 		case 2:
 			reqIndex2Treatment(port, value);
diff --git a/plugins/dfinput/externals.h b/plugins/dfinput/externals.h
index 2e216fdc..822fa2c5 100644
--- a/plugins/dfinput/externals.h
+++ b/plugins/dfinput/externals.h
@@ -10,6 +10,7 @@ void dfinput_activate(void);
 #define GUNIN_BTNB	(1<<2)
 #define GUNIN_TRIGGER2	(1<<3)	/* offscreen trigger */
 extern void pl_update_gun(int *xn, int *yn, int *xres, int *yres, int *in);
+extern void pl_gun_byte2(int port, unsigned char byte);
 
 /* vibration trigger to frontend */
 extern int in_enable_vibration;
-- 
2.39.2