Add invert analog input option

src/main/config/analogs.c

@@ -54,6 +54,7 @@ static void analog_ui_populate_controls(HWND hwnd);
 static INT_PTR analog_ui_handle_device_change(HWND hwnd);
 static INT_PTR analog_ui_handle_control_change(HWND hwnd);
 static INT_PTR analog_ui_handle_sensitivity_change(HWND hwnd);
+static INT_PTR analog_ui_handle_invert_change(HWND hwnd);
 static INT_PTR analog_ui_handle_tick(HWND hwnd);
 static INT_PTR analog_ui_handle_fini(HWND hwnd);
 
@@ -213,6 +214,15 @@ analog_ui_dlg_proc(HWND hwnd, UINT msg, WPARAM wparam, LPARAM lparam)
                             return FALSE;
                     }
 
+                case BN_CLICKED:
+                    switch (LOWORD(wparam)) {
+                        case IDC_ANALOG_INVERT:
+                            return analog_ui_handle_invert_change(hwnd);
+
+                        default:
+                            return FALSE;
+                    }
+
                 default:
                     return FALSE;
             }
@@ -519,6 +529,21 @@ static INT_PTR analog_ui_handle_sensitivity_change(HWND hwnd)
     return TRUE;
 }
 
+static INT_PTR analog_ui_handle_invert_change(HWND hwnd)
+{
+    struct analog_ui *ui;
+    HWND btn;
+    bool invert;
+
+    ui = (struct analog_ui *) GetWindowLongPtr(hwnd, GWLP_USERDATA);
+    btn = GetDlgItem(hwnd, IDC_ANALOG_INVERT);
+    invert = SendMessage(btn, BM_GETCHECK, 0, 0) == BST_CHECKED;
+
+    mapper_set_analog_invert(ui->def->tag, invert);
+
+    return TRUE;
+}
+
 static INT_PTR analog_ui_handle_tick(HWND hwnd)
 {
     struct analog_ui *ui;

src/main/config/config.rc

@@ -22,18 +22,19 @@ IDR_USAGES         USAGES         "config/usages.txt"
 // Dialog resources
 //
 LANGUAGE LANG_NEUTRAL, SUBLANG_NEUTRAL
-IDD_ANALOG DIALOG 0, 0, 220, 100
+IDD_ANALOG DIALOG 0, 0, 220, 115
 STYLE DS_3DLOOK | DS_CENTER | DS_SHELLFONT | WS_VISIBLE | WS_CHILDWINDOW
 EXSTYLE WS_EX_CONTROLPARENT
 FONT 8, "Ms Shell Dlg"
 {
-    GROUPBOX        "", IDC_GROUP, 5, 5, 210, 90
+    GROUPBOX        "", IDC_GROUP, 5, 5, 210, 105
     CONTROL         "", IDC_SENSITIVITY, TRACKBAR_CLASS, WS_TABSTOP | TBS_AUTOTICKS, 10, 75, 200, 15
     LTEXT           "Device", IDC_STATIC, 15, 15, 24, 8, SS_LEFT
     COMBOBOX        IDC_DEVICE, 15, 25, 135, 30, WS_GROUP | WS_TABSTOP | CBS_DROPDOWNLIST | CBS_HASSTRINGS
     COMBOBOX        IDC_CONTROL, 15, 50, 135, 30, WS_TABSTOP | CBS_DROPDOWNLIST | CBS_HASSTRINGS
     LTEXT           "Sensitivity", IDC_STATIC, 15, 65, 32, 8, SS_LEFT
     LTEXT           "Control", IDC_STATIC, 15, 40, 23, 8, SS_LEFT
+    AUTOCHECKBOX    "Invert Axis", IDC_ANALOG_INVERT, 15, 95, 141, 8
     CONTROL         "", IDC_POSITION, "spinner", 0x50020000, 160, 15, 50, 50, 0x02002000
 }
 
@@ -126,7 +127,7 @@ FONT 8, "Ms Shell Dlg"
 
 
 LANGUAGE LANG_NEUTRAL, SUBLANG_NEUTRAL
-IDD_TAB_ANALOGS DIALOG 0, 0, 220, 215
+IDD_TAB_ANALOGS DIALOG 0, 0, 220, 230
 STYLE DS_3DLOOK | DS_CENTER | DS_MODALFRAME | DS_SHELLFONT | WS_CAPTION | WS_VISIBLE | WS_POPUP | WS_SYSMENU
 CAPTION "Analogs"
 FONT 8, "Ms Shell Dlg"

src/main/config/resource.h

@@ -30,6 +30,7 @@
 #define IDC_DEVICE 1005
 #define IDC_BINDING_EDIT 1006
 #define IDC_CONTROL 1006
+#define IDC_ANALOG_INVERT 1007
 #define IDC_BINDING_CLEAR 1007
 #define IDC_BINDING_MIN 1008
 #define IDC_PAGE_TEXT 1008

src/main/geninput/geninput.def

@@ -44,6 +44,7 @@ EXPORTS
     mapper_set_action_map
     mapper_set_analog_map
     mapper_set_analog_sensitivity
+    mapper_set_analog_invert
     mapper_set_light_map
     mapper_set_nanalogs
     mapper_set_nlights

src/main/geninput/input-config.h

@@ -25,6 +25,7 @@ void mapper_set_action_map(
     uint8_t action, uint8_t page, uint8_t bit, const struct mapped_action *ma);
 bool mapper_set_analog_map(uint8_t analog, const struct mapped_analog *ma);
 bool mapper_set_analog_sensitivity(uint8_t analog, int32_t sensitivity);
+bool mapper_set_analog_invert(uint8_t analog, bool invert);
 void mapper_set_nanalogs(uint8_t nanalogs);
 void mapper_set_nlights(uint8_t nlights);
 void mapper_set_light_map(const struct mapped_light *ml, uint8_t game_light);

src/main/geninput/input.c

@@ -190,6 +190,11 @@ bool mapper_set_analog_sensitivity(uint8_t analog, int32_t sensitivity)
     return mapper_impl_set_analog_sensitivity(mapper_inst, analog, sensitivity);
 }
 
+bool mapper_set_analog_invert(uint8_t analog, bool invert)
+{
+    return mapper_impl_set_analog_invert(mapper_inst, analog, invert);
+}
+
 void mapper_set_light_map(const struct mapped_light *ml, uint8_t game_light)
 {
     mapper_impl_set_light_map(mapper_inst, ml, game_light);

src/main/geninput/mapper.c

@@ -26,8 +26,10 @@ struct analog_mapping {
     bool bound;
     bool valid;
     bool absolute;
-    double affine_scale;
-    double affine_bias;
+    bool invert;
+    double analog_min;
+    double analog_max;
+    double inv_analog_range;
     uint8_t pos;
 };
 
@@ -169,9 +171,11 @@ static void analog_mapping_bind(struct analog_mapping *am)
 
     ctl = &controls[am->src.control_no];
 
-    am->affine_bias = ctl->value_min;
-    am->affine_scale = ctl->value_max - ctl->value_min;
+    am->analog_min = ctl->value_min;
+    am->analog_max = ctl->value_max;
+    am->inv_analog_range = 1.0 / ((int64_t)ctl->value_max - ctl->value_min);
     am->absolute = !(ctl->flags & HID_FLAG_RELATIVE);
+    am->invert = false;
     am->valid = true;
 
 read_fail:
@@ -187,6 +191,7 @@ static void analog_mapping_update(struct analog_mapping *am)
 {
     double tmp;
     int32_t value;
+    int8_t delta;
 
     if (!am->bound) {
         analog_mapping_bind(am);
@@ -201,10 +206,24 @@ static void analog_mapping_update(struct analog_mapping *am)
     }
 
     if (am->absolute) {
-        tmp = (value - am->affine_bias) / am->affine_scale;
+
+        if (am->invert) {
+            tmp = am->analog_max - value;
+        } else {
+            tmp = value - am->analog_min;
+        }
+
+        // Scale the input value to [0,1] range
+        tmp *= am->inv_analog_range;
         am->pos = (uint8_t) ((tmp + 0.5) * 256.0);
     } else {
-        am->pos += (int8_t) (value * exp(am->sensitivity / 256.0));
+        delta = (int8_t) (value * exp(am->sensitivity / 256.0));
+
+        if (am->invert) {
+            delta *= -1;
+        }
+
+        am->pos += delta;
     }
 }
 
@@ -531,6 +550,18 @@ bool mapper_impl_set_analog_sensitivity(
     return true;
 }
 
+bool mapper_impl_set_analog_invert(
+    struct mapper *m, uint8_t analog, bool invert)
+{
+    if (analog >= m->nanalogs) {
+        return false;
+    }
+
+    m->analogs[analog].invert = invert;
+
+    return true;
+}
+
 void mapper_impl_set_light_map(
     struct mapper *m, const struct mapped_light *ml, uint8_t game_light)
 {

src/main/geninput/mapper.h

@@ -73,6 +73,8 @@ bool mapper_impl_set_analog_map(
     struct mapper *m, uint8_t analog, const struct mapped_analog *ma);
 bool mapper_impl_set_analog_sensitivity(
     struct mapper *m, uint8_t analog, int32_t sensitivity);
+bool mapper_impl_set_analog_invert(
+    struct mapper *m, uint8_t analog, bool invert);
 void mapper_impl_set_light_map(
     struct mapper *m, const struct mapped_light *ml, uint8_t game_light);
 void mapper_impl_set_nanalogs(struct mapper *m, uint8_t nanalogs);