Merge pull request #50 from algosup/maze_to_back_buffer_ben

Updated the maze and its building
algosup · Dec 7, 2023 · 679805e · 679805e
2 parents 14bf7b6 + 4042ef0
commit 679805e
Show file tree

Hide file tree

Showing 6 changed files with 229 additions and 520 deletions.
diff --git a/src/Initialization.asm b/src/Initialization.asm
@@ -2,7 +2,6 @@ section .bss
    BackgroundBufferSegment resw 1 ; where is stored the dynamic background (dynamic cuz gums are disappearing). Used to restore the screen after a ghost's passage
    ScreenBufferSegment resw 1
 
-section .data
    
 section .text
 
@@ -64,80 +63,55 @@ section .text
    
    ret
 
-
-
-
-
-
-
-
-
-
-
-
-
-
+   ; read the Maze model from the maze.asm, and build each bloc according to the hexacode, drawing the background into the background buffer
 
    MazeToBGbuffer: 
-   int3
-      xor dx, dx
+      xor dx, dx ; dh and dl are counters : dh will always contains the number of complete lines, dl contains the number of complete Tiles in this line
       push word [BackgroundBufferSegment]
       pop es
       ;ds is ok
-      .eachBlocsLine:
-         mov dl, 0 ; blocs in a line
-         .eachBlocOfTheLine:
+      .eachTilesLine:
+         mov dl, 0 ; Tiles in a line
+         .eachTileOfTheLine:
             push dx
-            mov ax, 0xA00 ; number of pixels in a bloc's line
+            mov ax, 8*SCREEN_WIDTH ; number of pixels in a Tile's line = 320*8 = (8*8 pixels)*(40 Tiles in a line) 
             mov bl, dh
-            and bx, 0x00FF
+            and bx, 0x00FF 
             mul bx
             mov di, ax ; di contains the number of pixels in complete lines
             pop dx
 
-            push dx
-            mov ax, 40 ; number of blocs in a bloc's line
+            mov ax, 40 ; number of Tiles in a Tile's line
             mov bl, dh
             mul bl
-            mov cx, ax ; cx contains the number of blocs in complete lines
-            pop dx
+            mov cx, ax ; cx contains the number of Tiles in complete lines
 
             push dx
             and dx, 0x00FF
-            add cx, dx ; cx now contains the number of complete blocs
+            add cx, dx ; cx now contains the number of complete Tiles
             pop dx
 
-            push dx
             mov ax, 8
             mov bl, dl
             mul bl
-            add di, ax ; di now contains the position to write the next bloc
-            pop dx
+            add di, ax ; di now contains the position to write the next Tile
 
-            push cx
-            shr cx, 1 ; from the 'cx'ième pixel, we convert it into the 'cx'ième byte where it is stored (1 byte = 2 nibbles = 2 pixels)
-            mov si, MazeModel5LE
+            mov si, MazeModel
             add si, cx
-            mov al, [ds:si] ; now al contains the 2 hexa codes (for sprite) of the byte where is the 'cx'ème bloc of mazemodel 
+            xor ax, ax
+            mov al, [ds:si] ; now al contains the hexa codes (for sprite) of the byte where is the 'cx'th Tile of mazemodel 
+            
             
-            ;check if the hexa code is in the high or low nibble, by looking at the parity of the counter
-            pop cx
-            test cl, 1 ; 
-            jnz .NoSecondNibble
-            shr ax, 4
-            .NoSecondNibble:
-
             push dx
             ; pick the sprite to display following the hexacode
-            and ax, 0xf ; keep only the concerned nibble containing the hexa code
             ; Get the offset of the sprite, following the hexa code
             mov si, MazeSpriteSheet
             mov bx, 8*8
             mul bx
             add si, ax ; si contains the offset of the sprite to display
             pop dx
             
-            ;we draw the bloc
+            ;we draw the Tile
             push cx
             push dx
             mov dx,8
@@ -152,10 +126,10 @@ section .text
 
             inc dl
             cmp dl, 40
-            jne .eachBlocOfTheLine
+            jb .eachTileOfTheLine
          inc dh
          cmp dh, 25
-         jne .eachBlocsLine
+         jb .eachTilesLine
       ret