feat(input): add strafe on A/D while preserving arrow key camera rotation

casino3d.inc

@@ -4450,6 +4450,10 @@ HandlePlayerInput PROC uses ebx esi edi
     local speed:DWORD
     local nextX:DWORD
     local nextY:DWORD
+    local fwdDir:DWORD
+    local strafeDir:DWORD
+    local deltaMoveX:DWORD
+    local deltaMoveY:DWORD
     local rcClient[16]:BYTE
     local ptCenter:C3D_POINT
     local ptCursor:C3D_POINT
@@ -4485,6 +4489,8 @@ HandlePlayerInput PROC uses ebx esi edi
 mouse_recenter:
     invoke SetCursorPos, ptCenter.x, ptCenter.y
 skip_mouse_look:
+
+    ; Movement speed with sprint (Shift = 10h)
     mov eax, deltaTime3D
     imul eax, 200
     mov speed, eax
@@ -4492,53 +4498,101 @@ skip_mouse_look:
     je @F
     shl speed, 1
 @@:
+
+    ; --- Keyboard Arrow Turning (VK_LEFT = 25h, VK_RIGHT = 27h) ---
     mov eax, deltaTime3D
     shr eax, 2
     inc eax
-    cmp keys3D[41h], 0
-    jne input_turn_left
     cmp keys3D[25h], 0
-    je input_right
-input_turn_left:
+    je @F
     sub playerAngle, eax
-input_right:
-    cmp keys3D[44h], 0
-    jne input_turn_right
+@@:
     cmp keys3D[27h], 0
-    je input_forward
-input_turn_right:
+    je @F
     add playerAngle, eax
-input_forward:
+@@:
     and playerAngle, 511
     call UpdateCamera3D
-    xor edi, edi
+
+    ; --- Forward / Backward Direction (W / Up / S / Down) ---
+    mov fwdDir, 0
     cmp keys3D[57h], 0
-    jne input_go_forward
+    jne @F
     cmp keys3D[26h], 0
-    je input_back
-input_go_forward:
-    inc edi
-input_back:
+    je check_back_key
+@@:
+    inc fwdDir
+check_back_key:
     cmp keys3D[53h], 0
-    jne input_go_back
+    jne @F
     cmp keys3D[28h], 0
-    je input_move
-input_go_back:
-    dec edi
-input_move:
+    je check_strafe_keys
+@@:
+    dec fwdDir
+
+check_strafe_keys:
+    ; --- Strafe Direction (A = Left, D = Right) ---
+    mov strafeDir, 0
+    cmp keys3D[44h], 0
+    je @F
+    inc strafeDir
+@@:
+    cmp keys3D[41h], 0
+    je @F
+    dec strafeDir
+@@:
+
+    ; --- Movement Calculation ---
+    mov deltaMoveX, 0
+    mov deltaMoveY, 0
+
+    ; Forward / Backward component
+    mov edi, fwdDir
     test edi, edi
-    jz input_action
+    jz calc_strafe_comp
+
     imul edi, speed
     mov eax, playerDirX
     imul edi
     shrd eax, edx, 16
-    add eax, playerX
-    mov nextX, eax
+    add deltaMoveX, eax
+
     mov eax, playerDirY
     imul edi
     shrd eax, edx, 16
-    add eax, playerY
+    add deltaMoveY, eax
+
+calc_strafe_comp:
+    ; Strafe Left / Right component: Right vector is (-playerDirY, playerDirX)
+    mov edi, strafeDir
+    test edi, edi
+    jz check_total_movement
+
+    imul edi, speed
+    mov eax, playerDirY
+    neg eax
+    imul edi
+    shrd eax, edx, 16
+    add deltaMoveX, eax
+
+    mov eax, playerDirX
+    imul edi
+    shrd eax, edx, 16
+    add deltaMoveY, eax
+
+check_total_movement:
+    mov eax, deltaMoveX
+    or eax, deltaMoveY
+    jz input_action
+
+    mov eax, playerX
+    add eax, deltaMoveX
+    mov nextX, eax
+
+    mov eax, playerY
+    add eax, deltaMoveY
     mov nextY, eax
+
     invoke CanWalk3D, nextX, playerY
     test eax, eax
     jz @F
@@ -4550,6 +4604,7 @@ input_move:
     jz input_action
     mov eax, nextY
     mov playerY, eax
+
 input_action:
     invoke Pressed3D, 45h
     test eax, eax