X-Git-Url: http://git.mutantstargoat.com/user/nuclear/?a=blobdiff_plain;f=dos1%2Fc.asm;h=fb0214fa457d9dfeaf4463a69f80c6488dd58bf4;hb=9b33802dd42b97ad95ae6940cf628923d8093d8a;hp=fdba3c0d1681d78c67ed143517e3c6b0fbc0b7a1;hpb=8e0a308b85272b28b59e7db0079472a81f0fc2dc;p=vtuts

diff --git a/dos1/c.asm b/dos1/c.asm
index fdba3c0..fb0214f 100644
--- a/dos1/c.asm
+++ b/dos1/c.asm
@@ -1,4 +1,4 @@
-; Lowest yet: 312
+; Lowest yet: 270
 
 	bits 16
 %ifdef BOOTSECT
@@ -16,10 +16,6 @@ RANDVAL equ code_end + 4
 
 %macro WAIT_VBLANK 0
 	mov dx, 3dah
-.inblank:
-	in al, dx
-	and al, 8
-	jnz .inblank	; loop while vblank bit is 1 (in vblank)
 .notblank:
 	in al, dx
 	and al, 8
@@ -45,43 +41,18 @@ start:
 	add ax, 1000h
 	mov es, ax
 
-	; setup palette for the effect
-	; - bg color (0)
-	; - shadow color (1)
-	; - fractal color (2)
-	mov dx, 0x3c8
-	xor al, al
-	out dx, al
-	inc dx
-	mov al, 10	; 0: 40, 40, 80
-	out dx, al
-	out dx, al
-	shl al, 1
-	out dx, al
-	mov al, 4	; 1: 16, 16, 32
-	out dx, al
-	out dx, al
-	shl al, 1
-	out dx, al
-	mov al, 18h	; 2: 96, 192, 96
-	out dx, al
-	mov al, 48
-	out dx, al
-	mov al, 18h
-	out dx, al
-
 mainloop:
 	call animate
 
 	; clear the framebuffer
-	xor al, al
+	mov al, 128
 	mov cx, 64000
 	xor di, di
 	rep stosb
 
 	; draw shadow
 	mov si, 5
-	mov byte [setcol + 1], 1	; shadow color
+	mov byte [setcol + 1], 199	; shadow color
 	call drawsierp
 	; draw fractal
 	xor si, si
@@ -167,16 +138,21 @@ sierp_vel:
 	dw 1, 1
 	dw -1, 1
 	dw -1, -1
+bounds	dw 200 - SHADOW_OFFS
+	dw 320 - SHADOW_OFFS
+
 
 animate:
 	mov cx, 3
 	mov di, sierp_verts
 	mov si, sierp_vel
 .loop:
+	mov ebx, 2
+.xyloop:
 	mov ax, [di]		; grab vertex X
 	add ax, [si]		; add velocity X
 	jl .xout
-	cmp ax, 320-SHADOW_OFFS
+	cmp ax, [ebx * 2 + bounds - 2]
 	jge .xout
 	jmp .skip_xflip
 .xout:
@@ -188,20 +164,9 @@ animate:
 	; to do the same for Y increment edi and esi by 2
 	add di, 2
 	add si, 2
-	mov ax, [di]		; grab vertex Y
-	add ax, [si]		; add velocity Y
-	jl .yout
-	cmp ax, 200-SHADOW_OFFS
-	jge .yout
-	jmp .skip_yflip
-.yout:
-	sub ax, [si]		; revert to previous Y
-	neg word [si]		; negate velocity Y
-.skip_yflip:
-	mov [di], ax		; update vertex Y
+	dec bx
+	jnz .xyloop
 
-	add di, 2
-	add si, 2
 	dec cx
 	jnz .loop
 	ret