320x200

go32bit.nasm

@@ -7,7 +7,8 @@
 %define GDT_CodeSegmentSelector GDT_Selector(GDT_CodeSegIndex, 0, 0)
 %define GDT_DataSegmentSelector GDT_Selector(GDT_DataSegIndex, 0, 0)
 
-%define VIDEO 0xB8000
+; %define VIDEO 0xB0000
+%define VIDEO 0xA0000
 
 ; GDT Stuff
 %define Data 0000b
@@ -171,7 +172,7 @@ Go32Bit:
 	call Enable_A20
 
 	; Set screen mode
-	mov ax, 0x0003 ; AH=0 (Change video mode), AL=13h (Mode) = 320x200 - 256 colors
+	mov ax, 0x0013 ; AH=0 (Change video mode), AL=13h (Mode) = 320x200 - 256 colors
 	mov bx, 0x0000
 	int 0x10 ; Video BIOS interrupt
 
@@ -244,55 +245,75 @@ ProtectedModeBaby:
 	; Setup stack
 	mov esp, 0xffffffff
 
-	mov ecx, 0
-	mov edx, 0
-	lea edi, [VIDEO]
-	mov ax, 0x4000
-LoopRows:
-	LoopCols:
-		mov bl, cl
-		and bl, dl
-		shl bl, 4
-		mov ah, bl
-		ror bl, 1
-		xor ah, bl
-		and ah, 0x70
-		mov al, dl
-		add al, cl
-		and al, 4
-		ror al, 1
-		or ah, al
-		mov al, 0
-		mov WORD [edi], ax
-		inc edi
-		inc edi
-		inc ecx
-		cmp ecx, 80
-		je BreakLoopCols
-		jmp LoopCols
-	BreakLoopCols:
-	mov ecx, 0
-	inc edx
-	cmp edx, 25
-	je BreakLoopRows
-	jmp LoopRows
-BreakLoopRows:
-
-WriteProtectedModeString:
-	cld
-	lea esi, [ProtectedWelcomeStr]
-	lea edi, [VIDEO+(80*2)*12+19*2]
-.print_loop:
-	mov al, BYTE [esi]
-	test al, al
-	jz .break_print_loop
-	mov BYTE [edi], al
-	mov BYTE [edi+1], 0x0f
-	inc esi
-	inc edi
-	inc edi
-	jmp .print_loop
-.break_print_loop:
+	DrawStuff:
+
+		push ebp
+		mov ebp, esp
+		sub esp, 4
+
+		mov ecx, 0
+		mov edx, 0
+		lea edi, [VIDEO]
+		mov ax, 0x4000
+		LoopRows:
+			LoopCols:
+				mov ebx, ecx
+				sub ebx, 160
+				imul ebx, ebx
+				; shr ebx, 0
+				mov eax, ebx
+				mov ebx, edx
+				sub ebx, 100
+				imul ebx, ebx
+				add eax, ebx
+
+				shr eax, 8
+				xor eax, ecx
+				sub eax, edx
+				ror al, 7
+				mov byte [edi], al
+				
+;
+				
+				; cmp eax, 40*40
+				; jge .OutOfCircle
+					; mov WORD [edi], 0x0f
+					; jmp .AfterOutOfCircle
+				; .OutOfCircle:
+					; mov WORD [edi], 0xff
+				; .AfterOutOfCircle:
+
+				; inc edi
+				inc edi
+				inc ecx
+				cmp ecx, 320
+				je BreakLoopCols
+				jmp LoopCols
+			BreakLoopCols:
+			mov ecx, 0
+			inc edx
+			cmp edx, 200
+			je BreakLoopRows
+			jmp LoopRows
+		BreakLoopRows:
+%if 0
+		WriteProtectedModeString:
+			lea esi, [ProtectedWelcomeStr]
+			lea edi, [VIDEO+(80*2)*12+19*2]
+			.print_loop:
+				mov al, BYTE [esi]
+				test al, al
+				jz .break_print_loop
+				mov BYTE [edi], al
+				mov BYTE [edi+1], 0x0f
+				inc esi
+				inc edi
+				inc edi
+				jmp .print_loop
+			.break_print_loop:
+%endif
+
+	pop ebp
 
 HALT:
 	cli