From 399a33fe36f8a777cd64dbbad7f3fa022360a5e6 Mon Sep 17 00:00:00 2001
From: negativeExponent <negativeExponent@users.noreply.github.com>
Date: Mon, 8 Jun 2020 18:09:22 +0800
Subject: [PATCH] Update mouse device support, add mouse sensitivity option

- Remove unnecessary accumulator, cleanup and comments
- Add "Emulated Mouse Sensitivity" core option with range from 0.05 to 2.00, with 1.00 as normal mouse movement.
---
 frontend/libretro.c              | 68 +++++++++++++++++---------------
 frontend/libretro_core_options.h | 48 ++++++++++++++++++++++
 2 files changed, 84 insertions(+), 32 deletions(-)

diff --git a/frontend/libretro.c b/frontend/libretro.c
index a91c5c17..50392a9c 100644
--- a/frontend/libretro.c
+++ b/frontend/libretro.c
@@ -90,6 +90,7 @@ static int show_advanced_gpu_peops_settings = -1;
 static int show_advanced_gpu_unai_settings = -1;
 #endif
 static int show_other_input_settings = -1;
+static float mouse_sensitivity = 1.0f;
 
 static unsigned previous_width = 0;
 static unsigned previous_height = 0;
@@ -2108,6 +2109,13 @@ static void update_variables(bool in_flight)
    }
 #endif /* NEW_DYNAREC */
 
+   var.value = NULL;
+   var.key = "pcsx_rearmed_input_sensitivity";
+   if (environ_cb(RETRO_ENVIRONMENT_GET_VARIABLE, &var) && var.value)
+   {
+      mouse_sensitivity = atof(var.value);
+   }
+
    var.key = "pcsx_rearmed_show_other_input_settings";
    var.value = NULL;
 
@@ -2396,6 +2404,32 @@ static void update_input_negcon(int port, int ret)
    in_analog_left[port][1] = get_analog_button(ret, input_state_cb, port, RETRO_DEVICE_ID_JOYPAD_L);
 }
 
+static void update_input_mouse(int port, int ret)
+{
+   float raw_x = input_state_cb(port, RETRO_DEVICE_MOUSE, 0, RETRO_DEVICE_ID_MOUSE_X);
+   float raw_y = input_state_cb(port, RETRO_DEVICE_MOUSE, 0, RETRO_DEVICE_ID_MOUSE_Y);
+
+   int x = (int)roundf(raw_x * mouse_sensitivity);
+   int y = (int)roundf(raw_y * mouse_sensitivity);
+
+   if (x > 127) x = 127;
+   else if (x < -128) x = -128;
+
+   if (y > 127) y = 127;
+   else if (y < -128) y = -128;
+
+   in_mouse[port][0] = x; /* -128..+128 left/right movement, 0 = no movement */
+   in_mouse[port][1] = y; /* -128..+128 down/up movement, 0 = no movement    */
+
+   /* left mouse button state */
+   if (input_state_cb(port, RETRO_DEVICE_MOUSE, 0, RETRO_DEVICE_ID_MOUSE_LEFT))
+      in_keystate[port] |= 1 << 11;
+
+   /* right mouse button state */
+   if (input_state_cb(port, RETRO_DEVICE_MOUSE, 0, RETRO_DEVICE_ID_MOUSE_RIGHT))
+      in_keystate[port] |= 1 << 10;
+}
+
 static void update_input(void)
 {
    // reset all keystate, query libretro for keystate
@@ -2432,38 +2466,8 @@ static void update_input(void)
          update_input_negcon(i, ret);
          break;
       case PSE_PAD_TYPE_MOUSE:
-      {
-         /* mouse x/y movement, range -128 to +127 */
-         float accum_x = 0, accum_y = 0;
-         
-         float x = input_state_cb(i, RETRO_DEVICE_MOUSE, 0, RETRO_DEVICE_ID_MOUSE_X);
-         float y = input_state_cb(i, RETRO_DEVICE_MOUSE, 0, RETRO_DEVICE_ID_MOUSE_Y);
-
-         accum_x += x;
-         accum_y += y;
-
-         if (accum_x > 127)
-            accum_x = 127;
-         else if (accum_x < -128)
-            accum_x = -128;
-
-         if (accum_y > 127)
-            accum_y = 127;
-         else if (accum_y < -128)
-            accum_y = -128;
-
-         in_mouse[i][0] = (int)accum_x;
-         in_mouse[i][1] = (int)accum_y;
-
-         /* mouse button state */
-         if (input_state_cb(i, RETRO_DEVICE_MOUSE, 0, RETRO_DEVICE_ID_MOUSE_LEFT))
-            in_keystate[i] |= 1 << 11;
-
-         if (input_state_cb(i, RETRO_DEVICE_MOUSE, 0, RETRO_DEVICE_ID_MOUSE_RIGHT))
-            in_keystate[i] |= 1 << 10;
-
-         break;
-      }
+         update_input_mouse(i, ret);
+         break;      
       default:
          // Query digital inputs
          for (j = 0; j < RETRO_PSX_MAP_LEN; j++)
diff --git a/frontend/libretro_core_options.h b/frontend/libretro_core_options.h
index 46670baa..95544f09 100644
--- a/frontend/libretro_core_options.h
+++ b/frontend/libretro_core_options.h
@@ -108,6 +108,54 @@ struct retro_core_option_definition option_defs_us[] = {
       },
       "disabled",
    },
+   {
+      "pcsx_rearmed_input_sensitivity",
+      "Emulated Mouse Sensitivity",
+      "Adjust responsiveness when using mouse controller (Default 1.0).",
+      {
+         { "0.05", NULL },
+         { "0.10", NULL },
+         { "0.15", NULL },
+         { "0.20", NULL },
+         { "0.25", NULL },
+         { "0.30", NULL },
+         { "0.35", NULL },
+         { "0.40", NULL },
+         { "0.45", NULL },
+         { "0.50", NULL },
+         { "0.55", NULL },
+         { "0.60", NULL },
+         { "0.65", NULL },
+         { "0.70", NULL },
+         { "0.75", NULL },
+         { "0.80", NULL },
+         { "0.85", NULL },
+         { "0.90", NULL },
+         { "0.95", NULL },
+         { "1.00", NULL },
+         { "1.05", NULL },
+         { "1.10", NULL },
+         { "1.15", NULL },
+         { "1.20", NULL },
+         { "1.25", NULL },
+         { "1.30", NULL },
+         { "1.35", NULL },
+         { "1.40", NULL },
+         { "1.45", NULL },
+         { "1.50", NULL },
+         { "1.55", NULL },
+         { "1.60", NULL },
+         { "1.65", NULL },
+         { "1.70", NULL },
+         { "1.75", NULL },
+         { "1.80", NULL },
+         { "1.85", NULL },
+         { "1.90", NULL },
+         { "1.95", NULL },
+         { "2.00", NULL },
+      },
+      "1.00",
+   },
    {
       "pcsx_rearmed_pad1type",
       "Pad 1 Type",
-- 
2.39.5