iidxhook9: Add turntable multiplier

dist/iidx/iidxhook-27.conf

@@ -16,6 +16,9 @@ io.disable_cams=false
 # Disables the built in file hooks, requiring manual file creation
 io.disable_file_hooks=false
 
+# Turntable sensitivity multiplier (1.0 is default)
+io.tt_multiplier=1.0
+
 # Disables the camera emulation
 cam.disable_emu=false
 

src/main/bio2emu-iidx/bi2a.c

@@ -4,11 +4,13 @@
 
 #include <windows.h> /* for _BitScanForward */
 
+#include <math.h>
 #include <stdint.h>
 #include <stdio.h>
 #include <string.h>
 
 #include "acioemu/emu.h"
+#include "util/math.h"
 
 #include "bemanitools/iidxio.h"
 
@@ -27,6 +29,11 @@ static bool poll_delay;
 static bool coin_latch;
 static uint8_t coin_count;
 
+static bool tt_multiplier_set;
+static float tt_multiplier = 1.f;
+static uint8_t tt_accum[2];
+static int16_t tt_last[2];
+
 int get_default_slider_valid(size_t idx)
 {
     if (default_sliders[idx] >= 0 && default_sliders[idx] <= 15) {
@@ -36,6 +43,12 @@ int get_default_slider_valid(size_t idx)
     }
 }
 
+void bio2_emu_bi2a_set_tt_multiplier(float multiplier)
+{
+    tt_multiplier_set = true;
+    tt_multiplier = multiplier;
+}
+
 void bio2_emu_bi2a_init(
     struct bio2emu_port *bio2_emu, bool disable_poll_limiter)
 {
@@ -158,6 +171,15 @@ static void bio2_emu_bi2a_send_status(
     ac_io_emu_response_push(emu, &resp, 0);
 }
 
+static int16_t tt_mult_delta(size_t tt_no) {
+    int16_t current_tt = iidx_io_ep2_get_turntable(tt_no);
+    int16_t delta = get_wrapped_delta_s16(current_tt, tt_last[tt_no], 256);
+
+    tt_last[tt_no] = current_tt;
+
+    return round(delta * tt_multiplier);
+}
+
 static void
 bio2_emu_bi2a_send_state(struct ac_io_emu *emu, const struct ac_io_message *req)
 {
@@ -233,8 +255,16 @@ bio2_emu_bi2a_send_state(struct ac_io_emu *emu, const struct ac_io_message *req)
         return bio2_emu_bi2a_send_status(emu, req, 0);
     }
 
-    body->TURNTABLE1 = iidx_io_ep2_get_turntable(0);
-    body->TURNTABLE2 = iidx_io_ep2_get_turntable(1);
+    if (tt_multiplier_set) {
+        tt_accum[0] += tt_mult_delta(0);
+        tt_accum[1] += tt_mult_delta(1);
+
+        body->TURNTABLE1 = tt_accum[0];
+        body->TURNTABLE2 = tt_accum[1];
+    } else {
+        body->TURNTABLE1 = iidx_io_ep2_get_turntable(0);
+        body->TURNTABLE2 = iidx_io_ep2_get_turntable(1);
+    }
 
     body->SLIDER1.s_val = get_default_slider_valid(0) ?
         default_sliders[0] :

src/main/bio2emu-iidx/bi2a.h

@@ -6,6 +6,7 @@
 #include "bio2emu/emu.h"
 
 void bio2_emu_bi2a_init(struct bio2emu_port *in, bool disable_poll_limiter);
+void bio2_emu_bi2a_set_tt_multiplier(float multiplier);
 void bio2_emu_bi2a_dispatch_request(
     struct bio2emu_port *bio2port, const struct ac_io_message *req);
 

src/main/iidxhook9/config-io.c

@@ -11,6 +11,7 @@
 #define IIDXHOOK9_CONFIG_IO_LIGHTNING_MODE_KEY "io.lightning_mode"
 #define IIDXHOOK9_CONFIG_IO_DISABLE_CAMS_KEY "io.disable_cams"
 #define IIDXHOOK9_CONFIG_IO_DISABLE_FILE_HOOKS_KEY "io.disable_file_hooks"
+#define IIDXHOOK9_CONFIG_IO_TT_MULTIPLIER_KEY "io.tt_multiplier"
 
 #define IIDXHOOK9_CONFIG_IO_DEFAULT_DISABLE_CARD_READER_EMU_VALUE false
 #define IIDXHOOK9_CONFIG_IO_DEFAULT_DISABLE_BIO2_EMU_VALUE false
@@ -18,6 +19,7 @@
 #define IIDXHOOK9_CONFIG_IO_DEFAULT_LIGHTNING_MODE_VALUE false
 #define IIDXHOOK9_CONFIG_IO_DEFAULT_DISABLE_CAMS_VALUE false
 #define IIDXHOOK9_CONFIG_IO_DEFAULT_DISABLE_FILE_HOOKS_VALUE false
+#define IIDXHOOK9_CONFIG_IO_DEFAULT_TT_MULTIPLIER_VALUE 1.0
 
 void iidxhook9_config_io_init(struct cconfig *config)
 {
@@ -57,6 +59,12 @@ void iidxhook9_config_io_init(struct cconfig *config)
         IIDXHOOK9_CONFIG_IO_DISABLE_FILE_HOOKS_KEY,
         IIDXHOOK9_CONFIG_IO_DEFAULT_DISABLE_FILE_HOOKS_VALUE,
         "Disables the built in file hooks, requiring manual file creation");
+
+    cconfig_util_set_float(
+        config,
+        IIDXHOOK9_CONFIG_IO_TT_MULTIPLIER_KEY,
+        IIDXHOOK9_CONFIG_IO_DEFAULT_TT_MULTIPLIER_VALUE,
+        "Turntable sensitivity multiplier (1.0 is default)");
 }
 
 void iidxhook9_config_io_get(
@@ -133,4 +141,16 @@ void iidxhook9_config_io_get(
             IIDXHOOK9_CONFIG_IO_DISABLE_FILE_HOOKS_KEY,
             IIDXHOOK9_CONFIG_IO_DEFAULT_DISABLE_FILE_HOOKS_VALUE);
     }
+
+    if (!cconfig_util_get_float(
+            config,
+            IIDXHOOK9_CONFIG_IO_TT_MULTIPLIER_KEY,
+            &config_io->tt_multiplier,
+            IIDXHOOK9_CONFIG_IO_DEFAULT_TT_MULTIPLIER_VALUE)) {
+        log_warning(
+            "Invalid value for key '%s' specified, fallback "
+            "to default '%f'",
+            IIDXHOOK9_CONFIG_IO_TT_MULTIPLIER_KEY,
+            IIDXHOOK9_CONFIG_IO_DEFAULT_TT_MULTIPLIER_VALUE);
+    }
 }

src/main/iidxhook9/config-io.h

@@ -12,6 +12,7 @@ struct iidxhook9_config_io {
     bool lightning_mode;
     bool disable_cams;
     bool disable_file_hooks;
+    float tt_multiplier;
 };
 
 void iidxhook9_config_io_init(struct cconfig *config);

src/main/util/Module.mk

@@ -10,6 +10,7 @@ src_util        := \
     iobuf.c \
     list.c \
     log.c \
+    math.c \
     mem.c \
     msg-thread.c \
     net.c \

src/main/util/math.c

@@ -0,0 +1,22 @@
+#include "util/math.h"
+
+int16_t get_wrapped_delta_s16(int16_t val, int16_t last, int16_t bound) {
+    int16_t half_point = bound / 2;
+
+    int16_t delta = val - last;
+
+    if (delta > half_point) {
+        delta -= bound;
+    }
+
+    if (delta < -half_point) {
+        delta += bound;
+    }
+
+    // delta is now between (-half_point - half_point)
+    return delta;
+}
+
+int16_t sign_s16(int16_t x) {
+    return (x > 0) - (x < 0);
+}

src/main/util/math.h

@@ -0,0 +1,9 @@
+#ifndef UTIL_MATH_H
+#define UTIL_MATH_H
+
+#include <stdint.h>
+
+int16_t get_wrapped_delta_s16(int16_t val, int16_t last, int16_t bound);
+int16_t sign_s16(int16_t x);
+
+#endif

src/main/vigem-sdvxio/main.c

@@ -9,6 +9,7 @@
 
 #include "bemanitools/sdvxio.h"
 #include "util/log.h"
+#include "util/math.h"
 #include "util/thread.h"
 #include "vigemstub/helper.h"
 
@@ -22,25 +23,6 @@ int16_t convert_analog_to_s16(uint16_t val)
     return (int64_t)(val * 64);
 }
 
-int16_t get_relative_delta(int16_t val, int16_t last)
-{
-    // val is 10 bit
-    const int16_t half_point = 512; // 2^9
-
-    int16_t delta = val - last;
-
-    if (delta > half_point) {
-        delta -= 1024;
-    }
-
-    if (delta < -half_point) {
-        delta += 1024;
-    }
-
-    // delta is now between (-512 - 512)
-    return delta;
-}
-
 int16_t filter_floor(int32_t value, int16_t floor) {
     if (abs(value) < floor) {
         return 0;
@@ -58,7 +40,8 @@ int16_t filter_floor(int32_t value, int16_t floor) {
 int32_t convert_relative_analog(
     uint16_t val, uint16_t last, int32_t buffered_last, int16_t multiplier)
 {
-    int16_t delta = get_relative_delta(val, last);
+    // val is 10 bit
+    int16_t delta = get_wrapped_delta_s16(val, last, 1024);
 
     if (delta == 0) {
         // ease the stick back to 0 like a real stick would