NeGcon: Add mapping of analog I/II buttons to right analog stick vertical axis

diff --git a/frontend/libretro.c b/frontend/libretro.c
index f9accf2..95d4e2b 100644 (file)
--- a/frontend/libretro.c
+++ b/frontend/libretro.c
@@ -1630,7 +1630,10 @@ void retro_run(void)
        // reset all keystate, query libretro for keystate
        int j;
        int lsx;
+       int rsy;
        float negcon_twist_amplitude;
+       int negcon_i_rs;
+       int negcon_ii_rs;
        for(i = 0; i < PORTS_NUMBER; i++) {
                in_keystate[i] = 0;
 
@@ -1706,15 +1709,48 @@ void retro_run(void)
                        }
                        // >> Convert to final 'in_analog' integer value [0,255]
                        in_analog_right[i][0] = MAX(MIN((int)(negcon_twist_amplitude * 128.0f) + 128, 255), 0);
-                       // > NeGcon I
+                       // > NeGcon I + II
+                       // >> Handle right analog stick vertical axis mapping...
+                       //    - Up (-Y) == accelerate == neGcon I
+                       //    - Down (+Y) == brake == neGcon II
+                       negcon_i_rs = 0;
+                       negcon_ii_rs = 0;
+                       rsy = input_state_cb(i, RETRO_DEVICE_ANALOG, RETRO_DEVICE_INDEX_ANALOG_RIGHT, RETRO_DEVICE_ID_ANALOG_Y);
+                       if (rsy >= 0){
+                               // Account for deadzone
+                               // (Note: have never encountered a gamepad with significant differences
+                               // in deadzone between left/right analog sticks, so use the regular 'twist'
+                               // deadzone here)
+                               if (rsy > negcon_deadzone){
+                                       rsy = rsy - negcon_deadzone;
+                               } else {
+                                       rsy = 0;
+                               }
+                               // Convert to 'in_analog' integer value [0,255]
+                               negcon_ii_rs = MIN((int)(((float)rsy / (float)(NEGCON_RANGE - negcon_deadzone)) * 255.0f), 255);
+                       } else {
+                               if (rsy < -negcon_deadzone){
+                                       rsy = -1 * (rsy + negcon_deadzone);
+                               } else {
+                                       rsy = 0;
+                               }
+                               negcon_i_rs = MIN((int)(((float)rsy / (float)(NEGCON_RANGE - negcon_deadzone)) * 255.0f), 255);
+                       }
+                       // >> NeGcon I
                        in_analog_right[i][1] = MAX(
-                               get_analog_button(input_state_cb, i, RETRO_DEVICE_ID_JOYPAD_R2),
-                               get_analog_button(input_state_cb, i, RETRO_DEVICE_ID_JOYPAD_B)
+                               MAX(
+                                       get_analog_button(input_state_cb, i, RETRO_DEVICE_ID_JOYPAD_R2),
+                                       get_analog_button(input_state_cb, i, RETRO_DEVICE_ID_JOYPAD_B)
+                               ),
+                               negcon_i_rs
                        );
-                       // > NeGcon II
+                       // >> NeGcon II
                        in_analog_left[i][0] = MAX(
-                               get_analog_button(input_state_cb, i, RETRO_DEVICE_ID_JOYPAD_L2),
-                               get_analog_button(input_state_cb, i, RETRO_DEVICE_ID_JOYPAD_Y)
+                               MAX(
+                                       get_analog_button(input_state_cb, i, RETRO_DEVICE_ID_JOYPAD_L2),
+                                       get_analog_button(input_state_cb, i, RETRO_DEVICE_ID_JOYPAD_Y)
+                               ),
+                               negcon_ii_rs
                        );
                        // > NeGcon L
                        in_analog_left[i][1] = get_analog_button(input_state_cb, i, RETRO_DEVICE_ID_JOYPAD_L);