Merge pull request #53 from algosup/fix-bugs-to-restore-the-backgroun…

…d-buffer Fix bugs to restore the background buffer
algosup · Dec 8, 2023 · caa516c · caa516c
2 parents 679805e + 88c2c1e
commit caa516c
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Showing 3 changed files with 28 additions and 9 deletions.
diff --git a/src/keyboard.asm b/src/keyboard.asm
@@ -11,7 +11,7 @@ readKeyboard:
 
     ; Read last key in buffer:
     .keepReadingBuffer:
-        int3
+        
         mov ah, 00h
         int 16h
         mov bx, ax

diff --git a/src/main.asm b/src/main.asm
@@ -15,10 +15,10 @@ section .text
         call BuildBackgroundBuffer
         call MazeToBGbuffer
         call DisplayMaze
-        call UpdateScreen
-       
         call FirstDisplayPacMan
         call FirstDisplayGhosts
+        call UpdateScreen
+        
 
         ; Display the period
         mov eax, PERIOD
@@ -27,17 +27,22 @@ section .text
         rdtsc
         mov [timestamp_of_next_frame], eax
 
+        ;mov cx, 0
+        ;push cx
+
 ;-----------------------------------------------------------------------------------------
 ;THE GAME LOOP
     gameloop:
 ;-------------------------------------------------
-        ;clear all
+        
         call waitLoop
-        call ClearPinky
+        
+        call ClearPinky        
         call ClearBlinky
         call ClearInky
         call ClearClyde
-        call ClearPacMan
+        call ClearPacMan 
+        ;call DisplayMaze
 
         call readKeyboard
 
@@ -53,13 +58,24 @@ section .text
         call Display_Clyde
 
         call UpdateScreen
+        ;pop cx
+        ;inc cx
+        ;cmp cx, 10
+        ;je DebugExit
+        ;push cx
+        
 
 
 ;-------------------------------------------------
 ; GOTO GAME LOOP
         jmp gameloop
 ;-----------------------------------------------------------------------------------------
 
+DebugExit: 
+;reset the keyboard buffer and then wait for a keypress :
+mov ax, 0C01h ; 
+int 21h
+
 exit:
     mov ax, 3h
     int 10h

diff --git a/src/sprites.asm b/src/sprites.asm
@@ -131,6 +131,8 @@ section .text
         ret
 
     ClearSprite:
+        push es
+        push ds
         mov cx, SCREEN_WIDTH
         mul cx
         add bx, ax
@@ -148,12 +150,13 @@ section .text
         .eachLine:
             mov cx, SPRITE_SIZE ; set the counter for 8 pixel per line
             rep movsb ; to mov the source from adress ds:si into the target from adress es:di byte per byte, 8 time (8 bits)
-            add di, SCREEN_WIDTH - SPRITE_SIZE ; increment the position register to the next line 
+            add di, SCREEN_WIDTH - SPRITE_SIZE
+            add si, SCREEN_WIDTH - SPRITE_SIZE ; increment the position register to the next line 
             dec dx ; decrementatin de dx, when it reach 0, the flag is 0 too cause of the dec propreties
             jnz .eachLine ; while the flag != 0, it continues
 
-        push cs       
-        pop ds
+        pop ds     
+        pop es
         ret