Add input analog axis range modifier

Add core option to change axis saturation. Square bounds allow controllers that struggle to fully register diagonal deflections . Very helpful with switch joycons and some android controllers.

diff --git a/frontend/libretro.c b/frontend/libretro.c
index 64e4145..b41eca0 100644 (file)
--- a/frontend/libretro.c
+++ b/frontend/libretro.c
@@ -126,6 +126,8 @@ int in_enable_vibration = 1;
 static int negcon_deadzone = 0;
 static int negcon_linearity = 1;
 
+static bool axis_bounds_modifier;
+
 /* PSX max resolution is 640x512, but with enhancement it's 1024x512 */
 #define VOUT_MAX_WIDTH 1024
 #define VOUT_MAX_HEIGHT 512
@@ -1643,6 +1645,18 @@ static void update_variables(bool in_flight)
       }
    }
 
+   var.value = NULL;
+   var.key = "pcsx_rearmed_analog_axis_modifier";
+   axis_bounds_modifier = true;
+   if (environ_cb(RETRO_ENVIRONMENT_GET_VARIABLE, &var) || var.value)
+   {
+      if (strcmp(var.value, "square") == 0) {
+        axis_bounds_modifier = true;
+         } else if (strcmp(var.value, "circle") == 0) {
+        axis_bounds_modifier = false;
+         }
+   }
+
    var.value = NULL;
    var.key = "pcsx_rearmed_vibration";
 
@@ -2167,6 +2181,23 @@ static uint16_t get_analog_button(int16_t ret, retro_input_state_t input_state_c
        return button;
 }
 
+unsigned char axis_range_modifier(int16_t axis_value, bool is_square) {
+       float modifier_axis_range = 0;
+
+       if(is_square) {
+               modifier_axis_range = round((axis_value >> 8) / 0.785) + 128;
+               if(modifier_axis_range < 0) {
+                       modifier_axis_range = 0;
+               } else if(modifier_axis_range > 255) {
+                       modifier_axis_range = 255;
+               }
+       } else {
+               modifier_axis_range = MIN(((axis_value >> 8) + 128), 255);
+       }
+
+       return modifier_axis_range;
+}
+
 void retro_run(void)
 {
        int i;
@@ -2439,10 +2470,10 @@ void retro_run(void)
                        // Query analog inputs
                        if (in_type[i] == PSE_PAD_TYPE_ANALOGJOY || in_type[i] == PSE_PAD_TYPE_ANALOGPAD)
                        {
-                               in_analog_left[i][0] = MIN((input_state_cb(i, RETRO_DEVICE_ANALOG, RETRO_DEVICE_INDEX_ANALOG_LEFT, RETRO_DEVICE_ID_ANALOG_X) / 255) + 128, 255);
-                               in_analog_left[i][1] = MIN((input_state_cb(i, RETRO_DEVICE_ANALOG, RETRO_DEVICE_INDEX_ANALOG_LEFT, RETRO_DEVICE_ID_ANALOG_Y) / 255) + 128, 255);
-                               in_analog_right[i][0] = MIN((input_state_cb(i, RETRO_DEVICE_ANALOG, RETRO_DEVICE_INDEX_ANALOG_RIGHT, RETRO_DEVICE_ID_ANALOG_X) / 255) + 128, 255);
-                               in_analog_right[i][1] = MIN((input_state_cb(i, RETRO_DEVICE_ANALOG, RETRO_DEVICE_INDEX_ANALOG_RIGHT, RETRO_DEVICE_ID_ANALOG_Y) / 255) + 128, 255);
+                               in_analog_left[i][0] = axis_range_modifier(input_state_cb(i, RETRO_DEVICE_ANALOG, RETRO_DEVICE_INDEX_ANALOG_LEFT, RETRO_DEVICE_ID_ANALOG_X), axis_bounds_modifier);
+                               in_analog_left[i][1] = axis_range_modifier(input_state_cb(i, RETRO_DEVICE_ANALOG, RETRO_DEVICE_INDEX_ANALOG_LEFT, RETRO_DEVICE_ID_ANALOG_Y), axis_bounds_modifier);
+                               in_analog_right[i][0] = axis_range_modifier(input_state_cb(i, RETRO_DEVICE_ANALOG, RETRO_DEVICE_INDEX_ANALOG_RIGHT, RETRO_DEVICE_ID_ANALOG_X), axis_bounds_modifier);
+                               in_analog_right[i][1] = axis_range_modifier(input_state_cb(i, RETRO_DEVICE_ANALOG, RETRO_DEVICE_INDEX_ANALOG_RIGHT, RETRO_DEVICE_ID_ANALOG_Y), axis_bounds_modifier);
                        }
                }
        }

diff --git a/frontend/libretro_core_options.h b/frontend/libretro_core_options.h
index 53b1095..aa9d3d4 100644 (file)
--- a/frontend/libretro_core_options.h
+++ b/frontend/libretro_core_options.h
@@ -266,6 +266,17 @@ struct retro_core_option_definition option_defs_us[] = {
       },
       "linear",
    },
+   {
+      "pcsx_rearmed_analog_axis_modifier",
+      "Analog axis bounds.",
+      "Range bounds for analog axis. Square bounds help controllers with highly circular ranges that are unable to fully saturate the x and y axis at 45degree deflections.",
+      {
+         { "circle", NULL },
+         { "square", NULL },
+         { NULL, NULL },
+      },
+      "circle",
+   },
    {
       "pcsx_rearmed_vibration",
       "Enable Vibration",