gun: fix M16 accuracy while running

Resolves #45.

CHANGELOG.md

@@ -1,7 +1,8 @@
 ## [Unreleased](https://github.com/LostArtefacts/TR2X/compare/stable...develop) - ××××-××-××
+- added an option to fix M16 accuracy while running (#45)
 - fixed sounds not playing under certain circumstances (#113, regression from 0.2)
-- fixed the excessive pitch and playback speed correction for music files with sampling rate other than 44100 Hz (LostArtefacts/TR1X#1417)
-- fixed a crash potential with certain music files
+- fixed the excessive pitch and playback speed correction for music files with sampling rate other than 44100 Hz (LostArtefacts/TR1X#1417, regression from 0.2)
+- fixed a crash potential with certain music files (regression from 0.2)
 - fixed enemy movement patterns in demo 1 and demo 3 (#98, regression from 0.1)
 - fixed underwater creatures dying (#98, regression from 0.1)
 - fixed a crash when spawning enemy drops (#125, regression from 0.1)

src/config.h

@@ -4,6 +4,10 @@
 
 typedef struct {
     bool loaded;
+
+    struct {
+        bool fix_m16_accuracy;
+    } gameplay;
 } CONFIG;
 
 extern CONFIG g_Config;

src/config_map.def

@@ -0,0 +1 @@
+CFG_BOOL(g_Config, gameplay.fix_m16_accuracy, true)

src/game/gun/gun_rifle.c

@@ -1,5 +1,6 @@
 #include "game/gun/gun_rifle.h"
 
+#include "config.h"
 #include "game/gun/gun.h"
 #include "game/gun/gun_misc.h"
 #include "game/math.h"
@@ -111,12 +112,14 @@ void __cdecl Gun_Rifle_FireM16(const bool running)
     angles[0] = g_Lara.left_arm.rot.y + g_LaraItem->rot.y;
     angles[1] = g_Lara.left_arm.rot.x;
 
-    if (running) {
-        g_Weapons[O_LARA_M16].shot_accuracy = PHD_DEGREE * 12;
-        g_Weapons[O_LARA_M16].damage = 1;
-    } else {
-        g_Weapons[O_LARA_M16].shot_accuracy = PHD_DEGREE * 4;
-        g_Weapons[O_LARA_M16].damage = 3;
+    if (g_Config.gameplay.fix_m16_accuracy) {
+        if (running) {
+            g_Weapons[LGT_M16].shot_accuracy = PHD_DEGREE * 12;
+            g_Weapons[LGT_M16].damage = 1;
+        } else {
+            g_Weapons[LGT_M16].shot_accuracy = PHD_DEGREE * 4;
+            g_Weapons[LGT_M16].damage = 3;
+        }
     }
 
     if (Gun_FireWeapon(LGT_M16, g_Lara.target, g_LaraItem, angles)) {