fix(engine): resolve DDA division overflow crash and Pause mnemonic collision

build.bat

@@ -1,14 +1,56 @@
 @echo off
-set MASM_PATH=D:\MASM32\masm32
+setlocal
+
+rem Check standard MASM32 paths first
+if exist "D:\MASM32\masm32\bin\ml.exe" (
+    set "ML_EXE=D:\MASM32\masm32\bin\ml.exe"
+    set "LINK_EXE=D:\MASM32\masm32\bin\link.exe"
+    set "LIB_PATHS=/LIBPATH:D:\MASM32\masm32\lib"
+    set "EXTRA_FLAGS=/SUBSYSTEM:WINDOWS /RELEASE /VERSION:4.0"
+    goto do_build
+)
+if exist "C:\masm32\bin\ml.exe" (
+    set "ML_EXE=C:\masm32\bin\ml.exe"
+    set "LINK_EXE=C:\masm32\bin\link.exe"
+    set "LIB_PATHS=/LIBPATH:C:\masm32\lib"
+    set "EXTRA_FLAGS=/SUBSYSTEM:WINDOWS /RELEASE /VERSION:4.0"
+    goto do_build
+)
+
+rem Fallback to Visual Studio / MSVC BuildTools
+set "MSVC_BIN=C:\Program Files (x86)\Microsoft Visual Studio\18\BuildTools\VC\Tools\MSVC\14.50.35717\bin\Hostx64\x86"
+set "SDK_LIB=C:\Program Files (x86)\Windows Kits\10\Lib\10.0.26100.0\um\x86"
+set "UCRT_LIB=C:\Program Files (x86)\Windows Kits\10\Lib\10.0.26100.0\ucrt\x86"
+set "VC_LIB=C:\Program Files (x86)\Microsoft Visual Studio\18\BuildTools\VC\Tools\MSVC\14.50.35717\lib\x86"
+
+if exist "%MSVC_BIN%\ml.exe" (
+    set "ML_EXE=%MSVC_BIN%\ml.exe"
+    set "LINK_EXE=%MSVC_BIN%\link.exe"
+    set LIB_PATHS=/LIBPATH:"%SDK_LIB%" /LIBPATH:"%UCRT_LIB%" /LIBPATH:"%VC_LIB%"
+    set "EXTRA_FLAGS=/NOLOGO /SUBSYSTEM:WINDOWS"
+    goto do_build
+)
+
+echo [ERROR] No compatible MASM/MSVC assembler found!
+goto err
+
+:do_build
 echo Assembling poker.asm...
-"%MASM_PATH%\bin\ml.exe" /c /coff /Cp /nologo /I. /I"%MASM_PATH%\include" poker.asm
+"%ML_EXE%" /c /coff /Cp /nologo /I. poker.asm
 if errorlevel 1 goto err
+
 echo Linking poker.obj...
-"%MASM_PATH%\bin\link.exe" /SUBSYSTEM:CONSOLE /RELEASE /VERSION:4.0 /LIBPATH:"%MASM_PATH%\lib" /OUT:poker.exe poker.obj kernel32.lib winmm.lib user32.lib ws2_32.lib gdi32.lib
+"%LINK_EXE%" %EXTRA_FLAGS% %LIB_PATHS% /OUT:poker.exe poker.obj kernel32.lib winmm.lib user32.lib ws2_32.lib gdi32.lib
 if errorlevel 1 goto err
+
+copy /y poker.exe build\graphics\poker.exe >nul 2>&1
 echo [SUCCESS] poker.exe built successfully!
 goto end
+
 :err
 echo [ERROR] Build failed!
 pause
+exit /b 1
+
 :end
+endlocal

build/graphics/casino3d.inc

@@ -146,10 +146,10 @@ sz3DWindowTitle    db "Assembler Casino - 2.5D",0
 szTexturesRelPath  db "assets\textures\casino3d-hd.bin",0
 szTexturesFullPath db 260 dup(0)
 
-soundCoin          db "assets\audio\Звон падающей монеты.wav",0
+soundCoin          db "assets\audio\Çâîí ïàäàþùåé ìîíåòû.wav",0
 soundCards         db "assets\audio\playing_cards_deck_flick_through_001_20485.wav",0
 soundRoulette      db "assets\audio\roulette-wheel-throw-2.wav",0
-soundJackpot       db "assets\audio\Джекпот.wav",0
+soundJackpot       db "assets\audio\Äæåêïîò.wav",0
 soundClick         db "assets\audio\b05e1ac8be34248.wav",0
 
 playerX            dd (16 * FP_1 + FP_HALF)
@@ -179,12 +179,12 @@ promptBackroom db "BACKROOM - UNDER CONSTRUCTION",0
 promptDurak db "DURAK - UNDER CONSTRUCTION",0
 promptHell db "TOWER - UNDER CONSTRUCTION",0
 
-msgDancerTipped    db "Вы бросили $100 танцовщице! УДАЧА АКТИВИРОВАНА!",0
+msgDancerTipped    db "Âû áðîñèëè $100 òàíöîâùèöå! ÓÄÀ×À ÀÊÒÈÂÈÐÎÂÀÍÀ!",0
-msgNeedMoney       db "Недостаточно денег в кошельке!",0
+msgNeedMoney       db "Íåäîñòàòî÷íî äåíåã â êîøåëüêå!",0
-statusHUDFormat    db "БАНКРОЛЛ: $",0
+statusHUDFormat    db "ÁÀÍÊÐÎËË: $",0
-targetHUDFormat    db "  ЦЕЛЬ: $",0
+targetHUDFormat    db "  ÖÅËÜ: $",0
-luckHUDFormat      db "  УДАЧА: +",0
+luckHUDFormat      db "  ÓÄÀ×À: +",0
-controlsHUD        db "WASD/Стрелки: Ходьба | E: Действие | ESC: Меню",0
+controlsHUD        db "WASD/Ñòðåëêè: Õîäüáà | E: Äåéñòâèå | ESC: Ìåíþ",0
 
 NUM_SPRITES        equ 13
 ALIGN 4
@@ -227,12 +227,12 @@ roulOutcomeMsg     db 64 dup(0)
 shopMsg            db 128 dup(0)
 atmMsg             db 128 dup(0)
 
-strWin             db "ПОБЕДА! +$",0
+strWin             db "ÏÎÁÅÄÀ! +$",0
-strLose            db "ПРОИГРЫШ",0
+strLose            db "ÏÐÎÈÃÐÛØ",0
-strJackpot         db "ДЖЕКПОТ! +$",0
+strJackpot         db "ÄÆÅÊÏÎÒ! +$",0
-strPush            db "НИЧЬЯ (PUSH)",0
+strPush            db "ÍÈ×Üß (PUSH)",0
-strDealerBust      db "ДИЛЕР ПЕРЕБРАЛ! ПОБЕДА! +$",0
+strDealerBust      db "ÄÈËÅÐ ÏÅÐÅÁÐÀË! ÏÎÁÅÄÀ! +$",0
-strPlayerBust      db "ПЕРЕБОР (>21)! ПРОИГРЫШ",0
+strPlayerBust      db "ÏÅÐÅÁÎÐ (>21)! ÏÐÎÈÃÐÛØ",0
 
 sym7               db " 777 ",0
 symBar             db " BAR ",0
@@ -763,11 +763,15 @@ calc_delta_x:
     neg eax
 @@:
     mov ebx, eax
-    ; 2^32 needs the full EDX:EAX dividend, not a truncated multiply.
+    cmp ebx, 4
+    jbe delta_x_clamp
     xor eax, eax
     mov edx, 1
-    idiv ebx
+    div ebx
     mov deltaDistX, eax
+    jmp calc_delta_y
+delta_x_clamp:
+    mov deltaDistX, 7FFFFFFFh
 
 calc_delta_y:
     mov eax, rayDirY
@@ -781,11 +785,15 @@ calc_delta_y_ok:
     neg eax
 @@:
     mov ebx, eax
-    ; 2^32 needs the full EDX:EAX dividend, not a truncated multiply.
+    cmp ebx, 4
+    jbe delta_y_clamp
     xor eax, eax
     mov edx, 1
-    idiv ebx
+    div ebx
     mov deltaDistY, eax
+    jmp check_step
+delta_y_clamp:
+    mov deltaDistY, 7FFFFFFFh
 
 check_step:
     cmp rayDirX, 0
@@ -988,6 +996,13 @@ select_tex:
     mov drawEnd, SCREEN_H - 1
 @@:
 
+    mov eax, lineH
+    cmp eax, 1
+    jge @F
+    mov eax, 1
+    mov lineH, eax
+@@:
+
     mov eax, 128 * FP_1
     cdq
     idiv lineH
@@ -1151,13 +1166,22 @@ draw_spr_loop:
     ; Sample animation by elapsed time. Pausing freezes the clock.
     push eax
     mov ecx, [casinoSprites + eax].animSpeed
+    cmp ecx, 0
+    jg @F
+    mov ecx, 1
+@@:
     imul ecx, 40
     mov eax, animationClock3D
     xor edx, edx
     div ecx
     pop ebx
+    mov ecx, [casinoSprites + ebx].frameCount
+    cmp ecx, 0
+    jg @F
+    mov ecx, 1
+@@:
     xor edx, edx
-    div [casinoSprites + ebx].frameCount
+    div ecx
     mov [casinoSprites + ebx].curFrame, edx
     mov eax, ebx
 
@@ -1181,8 +1205,14 @@ draw_spr_loop:
     imul playerPlaneY
     shrd eax, edx, 16
     sub ebx, eax
-    test ebx, ebx
+
-    jz next_spr
+    mov eax, ebx
+    test eax, eax
+    jns @F
+    neg eax
+@@:
+    cmp eax, 4
+    jbe next_spr
 
     ; 2^32 needs the full EDX:EAX dividend, not a truncated multiply.
     xor eax, eax
@@ -1238,6 +1268,10 @@ draw_spr_loop:
     test eax, eax
     jns @F
     neg eax
+@@:
+    cmp eax, 1
+    jge @F
+    jmp next_spr
 @@:
     cmp eax, SCREEN_H * 2
     jle @F

casino3d.inc

@@ -763,11 +763,15 @@ calc_delta_x:
     neg eax
 @@:
     mov ebx, eax
-    ; 2^32 needs the full EDX:EAX dividend, not a truncated multiply.
+    cmp ebx, 4
+    jbe delta_x_clamp
     xor eax, eax
     mov edx, 1
-    idiv ebx
+    div ebx
     mov deltaDistX, eax
+    jmp calc_delta_y
+delta_x_clamp:
+    mov deltaDistX, 7FFFFFFFh
 
 calc_delta_y:
     mov eax, rayDirY
@@ -781,11 +785,15 @@ calc_delta_y_ok:
     neg eax
 @@:
     mov ebx, eax
-    ; 2^32 needs the full EDX:EAX dividend, not a truncated multiply.
+    cmp ebx, 4
+    jbe delta_y_clamp
     xor eax, eax
     mov edx, 1
-    idiv ebx
+    div ebx
     mov deltaDistY, eax
+    jmp check_step
+delta_y_clamp:
+    mov deltaDistY, 7FFFFFFFh
 
 check_step:
     cmp rayDirX, 0
@@ -988,6 +996,13 @@ select_tex:
     mov drawEnd, SCREEN_H - 1
 @@:
 
+    mov eax, lineH
+    cmp eax, 1
+    jge @F
+    mov eax, 1
+    mov lineH, eax
+@@:
+
     mov eax, 128 * FP_1
     cdq
     idiv lineH
@@ -1151,13 +1166,22 @@ draw_spr_loop:
     ; Sample animation by elapsed time. Pausing freezes the clock.
     push eax
     mov ecx, [casinoSprites + eax].animSpeed
+    cmp ecx, 0
+    jg @F
+    mov ecx, 1
+@@:
     imul ecx, 40
     mov eax, animationClock3D
     xor edx, edx
     div ecx
     pop ebx
+    mov ecx, [casinoSprites + ebx].frameCount
+    cmp ecx, 0
+    jg @F
+    mov ecx, 1
+@@:
     xor edx, edx
-    div [casinoSprites + ebx].frameCount
+    div ecx
     mov [casinoSprites + ebx].curFrame, edx
     mov eax, ebx
 
@@ -1181,8 +1205,14 @@ draw_spr_loop:
     imul playerPlaneY
     shrd eax, edx, 16
     sub ebx, eax
-    test ebx, ebx
+
-    jz next_spr
+    mov eax, ebx
+    test eax, eax
+    jns @F
+    neg eax
+@@:
+    cmp eax, 4
+    jbe next_spr
 
     ; 2^32 needs the full EDX:EAX dividend, not a truncated multiply.
     xor eax, eax
@@ -1238,6 +1268,10 @@ draw_spr_loop:
     test eax, eax
     jns @F
     neg eax
+@@:
+    cmp eax, 1
+    jge @F
+    jmp next_spr
 @@:
     cmp eax, SCREEN_H * 2
     jle @F