Mouse stuff

main.asm

@@ -33,10 +33,11 @@ main:
 
 
     cli
+    
     mov bx, [mouseX]
     sti
 
-    call print_hex
+    call print_sint
     call print_nl
 
     jmp lp

mouse_util.asm

@@ -98,6 +98,42 @@ mouse_disable:
     pop es
     ret
 
+clamp_mouse_bounds:
+    pusha
+
+    cli
+    mov ax, [mouseX]
+    mov bx, [mouseY]
+    sti
+
+    test ax, 0x8000
+    jnz .x0
+    mov ax, 0
+    .x0:
+
+    test bx, 0x8000
+    jnz .y0
+    mov bx, 0
+    .y0:
+
+    cmp bx, 320
+    jle .x1
+    mov bx, 320
+    .x1:
+
+    cmp ax, 200
+    jle .y1
+    mov ax, 200
+    .y1:
+
+    cli
+    mov [mouseX], ax
+    mov [mouseY], bx
+    sti
+
+    popa
+    ret
+
 ; Function: mouse_callback (FAR)
 ;           called by the interrupt handler to process a mouse data packet
 ;           All registers that are modified must be saved and restored
@@ -143,6 +179,28 @@ mouse_callback:
     mov cx, [mouseX]
     add ax, cx                  ; AX = new mouse X_coord
 
+    ; clamp values
+
+    test ax, 0x8000
+    jz .x0
+    mov ax, 0
+    .x0:
+
+    test bx, 0x8000
+    jz .y0
+    mov bx, 0
+    .y0:
+
+    cmp ax, 320
+    jle .x1
+    mov ax, 320
+    .x1:
+
+    cmp bx, 200
+    jle .y1
+    mov bx, 200
+    .y1:
+
     ; Status
     mov [curStatus], bl         ; Update the current status with the new bits
     mov [mouseX], ax            ; Update current virtual mouseX coord

print_util.asm

@@ -1,8 +1,13 @@
 %macro print_ch 1
        push ax
+       push bx
+       
+       mov bx, 0x000F
        mov al, %1
        mov ah, 0x0e
        int 0x10
+
+       pop bx
        pop ax
 %endmacro
 
@@ -14,6 +19,7 @@
     int 0x10 ; Graphics services
 %endmacro
 
+; bx = string to print
 print:
     pusha
 
@@ -74,8 +80,11 @@ print_hex_digit:
     .skip_alpha:
     add al, 0x30 ; Add ASCII '0'
     
+    push bx
+    mov bx, 0x000F
     mov ah, 0x0e
     int 0x10
+    pop bx
     
     popa
     ret
@@ -136,6 +145,7 @@ print_bin:
     popa
     ret
 
+; bx = number to print
 print_uint:
     pusha
     
@@ -160,7 +170,10 @@ print_uint:
         pop ax ; 16-bit value
         mov ah, 0x0e
         ;add al, 0x30
+        push bx
+        mov bx, 0x000F
         int 0x10
+        pop bx
 
         cmp bx, 0
         jnz .print_loop