From e737d6089360266b3d9c242e895afc613227ac43 Mon Sep 17 00:00:00 2001
From: Will Xyen <willxinc@users.noreply.github.com>
Date: Tue, 10 Nov 2020 18:06:51 -0800
Subject: [PATCH] Actually implement the coin mech in BIO2 based games

Properly fixes #45
---
 src/main/bio2/bi2a-iidx.h    |  2 +-
 src/main/bio2/bi2a-sdvx.h    |  2 +-
 src/main/bio2emu-iidx/bi2a.c | 13 +++++++++++++
 src/main/sdvxhook2/bi2a.c    | 21 ++++++++++++++++++---
 4 files changed, 33 insertions(+), 5 deletions(-)

diff --git a/src/main/bio2/bi2a-iidx.h b/src/main/bio2/bi2a-iidx.h
index b219682..6248128 100644
--- a/src/main/bio2/bi2a-iidx.h
+++ b/src/main/bio2/bi2a-iidx.h
@@ -39,7 +39,7 @@ struct bi2a_iidx_state_out {
     uint8_t UNK2;
     struct bi2a_iidx_slider SLIDER4;
     struct bi2a_iidx_slider SLIDER5;
-    uint8_t UNK3; // coin mech?
+    uint8_t coins; // coin mech?
     struct bi2a_iidx_panel PANEL;
     uint8_t UNK4;
     uint8_t UNK5;
diff --git a/src/main/bio2/bi2a-sdvx.h b/src/main/bio2/bi2a-sdvx.h
index 502f36b..f51f521 100644
--- a/src/main/bio2/bi2a-sdvx.h
+++ b/src/main/bio2/bi2a-sdvx.h
@@ -36,7 +36,7 @@ struct bi2a_sdvx_state_in {
         uint16_t raw[8];
         struct {
             struct bi2a_sdvx_analog analogs[4];
-            uint8_t unk_1; // coin mech?
+            uint8_t coins;
             struct bi2a_sdvx_buttons1 buttons_1;
             struct bi2a_sdvx_buttons2 buttons_2;
             uint8_t unk_2[5];
diff --git a/src/main/bio2emu-iidx/bi2a.c b/src/main/bio2emu-iidx/bi2a.c
index c590f29..fc66222 100644
--- a/src/main/bio2emu-iidx/bi2a.c
+++ b/src/main/bio2emu-iidx/bi2a.c
@@ -24,6 +24,8 @@ static void bio2_emu_bi2a_send_status(
 
 static int default_sliders[5];
 static bool poll_delay;
+static bool coin_latch;
+static uint8_t coin_count;
 
 int get_default_slider_valid(size_t idx)
 {
@@ -277,5 +279,16 @@ bio2_emu_bi2a_send_state(struct ac_io_emu *emu, const struct ac_io_message *req)
     body->SYSTEM.v_service = (input_sys >> IIDX_IO_SYS_SERVICE) & 1;
     body->SYSTEM.v_coin = (input_sys >> IIDX_IO_SYS_COIN) & 1;
 
+    if (body->SYSTEM.v_coin) {
+        if (!coin_latch) {
+            coin_latch = true;
+            coin_count += 1;
+        }
+    } else {
+        coin_latch = false;
+    }
+
+    body->coins = coin_count;
+
     ac_io_emu_response_push(emu, &resp, 0);
 }
diff --git a/src/main/sdvxhook2/bi2a.c b/src/main/sdvxhook2/bi2a.c
index 71de63b..f71230c 100644
--- a/src/main/sdvxhook2/bi2a.c
+++ b/src/main/sdvxhook2/bi2a.c
@@ -27,6 +27,9 @@ static bool poll_delay;
 
 static bool force_headphones_on;
 
+static bool coin_latch;
+static uint8_t coin_count;
+
 void bio2_emu_bi2a_init(
     struct bio2emu_port *bio2_emu,
     bool disable_poll_limiter,
@@ -241,10 +244,22 @@ bio2_emu_bi2a_send_state(struct ac_io_emu *emu, const struct ac_io_message *req)
     pin->analogs[0].a_val = sdvx_io_get_spinner_pos(0);
     pin->analogs[1].a_val = sdvx_io_get_spinner_pos(1);
 
-    pin->analogs[0].a_coin = check_pin(sys, SDVX_IO_IN_GPIO_SYS_COIN);
     pin->analogs[0].a_test = check_pin(sys, SDVX_IO_IN_GPIO_SYS_TEST);
-    pin->analogs[0].a_service = check_pin(sys, SDVX_IO_IN_GPIO_SYS_SERVICE) ||
-        check_pin(sys, SDVX_IO_IN_GPIO_SYS_COIN);
+    pin->analogs[0].a_service = check_pin(sys, SDVX_IO_IN_GPIO_SYS_SERVICE);
+    pin->analogs[0].a_coin = check_pin(sys, SDVX_IO_IN_GPIO_SYS_COIN);
+
+    if (pin->analogs[0].a_coin) {
+        if (!coin_latch) {
+            coin_latch = true;
+            coin_count += 1;
+        }
+    } else {
+        coin_latch = false;
+    }
+
+    // this is NOT byteswapped, only the analogs are
+    pin->coins = coin_count;
+
     pin->raw[0] = ac_io_u16(pin->raw[0]);
     pin->raw[1] = ac_io_u16(pin->raw[1]);