X-Git-Url: http://git.mutantstargoat.com/user/nuclear/?p=ld45_start_nothing;a=blobdiff_plain;f=src%2Fmain.asm;fp=src%2Fmain.asm;h=a5e075460c63026b209c03d1df6fd2bb6e8f02c3;hp=c3ab902519ee6440675a9b4e3d1eb2e380e06a99;hb=033d820931e5930051b9df6a0c4a8183aa9299ee;hpb=e89f229506bcd5962dc6a7a6a07e5aab2fa7f7c5

diff --git a/src/main.asm b/src/main.asm
index c3ab902..a5e0754 100644
--- a/src/main.asm
+++ b/src/main.asm
@@ -5,6 +5,8 @@
 %include "intr.inc"
 %include "dbglog.inc"
 
+PLAYER_MOVE_SPEED equ 5
+
 	; this is placed at the beginning of our binary at 1mb (see game.ld)
 	; and it's what gets executed directly by the boot loader
 	section .startup
@@ -41,19 +43,36 @@ main_loop:
 	jmp main_loop
 
 update:
+	mov eax, [ship_y]
+
 	check_key SC_W
 	jnc .not_w
-	dec dword [ship_y]
+	sub eax, PLAYER_MOVE_SPEED
+	jns .not_w
+	xor eax, eax
 .not_w:	check_key SC_S
 	jnc .not_s
-	inc dword [ship_y]
-.not_s: check_key SC_A
+	add eax, PLAYER_MOVE_SPEED
+	cmp eax, 200 << 8
+	jb .not_s
+	mov eax, 200 << 8
+.not_s:
+	mov [ship_y], eax
+	mov eax, [ship_x]
+
+	check_key SC_A
 	jnc .not_a
-	dec dword [ship_x]
+	sub eax, PLAYER_MOVE_SPEED
+	jns .not_a
+	xor eax, eax
 .not_a: check_key SC_D
 	jnc .not_d
-	inc dword [ship_x]
+	add eax, PLAYER_MOVE_SPEED
+	cmp eax, 320 << 8
+	jb .not_d
+	mov eax, 320 << 8
 .not_d:
+	mov [ship_x], eax
 	ret
 
 	section .data