double: got rid of bottom line jitter

was trouble in the sine table

vaporlock/doubledouble/Makefile

@@ -34,8 +34,7 @@ double.o:	double.s \
 	music/fighting.zx02 \
 	setup_graphics.s \
 	effect_static.s \
-	effect_dhgr_dgr.s \
-	effect_dhgr_hgr.s \
+	effect_sin_window.s \
 	effect_midline.s \
 	table/sin.table \
 	graphics/sworg_hgr.hgr.zx02 \

vaporlock/doubledouble/double.s

@@ -294,6 +294,11 @@ effect_smc:
 
 .align $100
 
+sin_table:
+.incbin "table/sin.table"
+
+; sin_table is 256 bytes so this should still be aligned
+
 .include "vblank.s"
 
 	; actually want 1524-12 = 1512 (6 each for jsr/rts)
@@ -330,7 +335,7 @@ delay_12:
 	rts
 
 
-.include "effect_dhgr_dgr.s"
+.include "effect_sin_window.s"
 
 .include "effect_static.s"
 
@@ -397,8 +402,6 @@ config_string:
 .include "gr_offsets.s"
 ;.include "load_music.s"
 
-sin_table:
-.incbin "table/sin.table"
 
 fighting_zx02:
 .incbin "music/fighting.zx02"

vaporlock/doubledouble/effect_sin_window.s

@@ -25,9 +25,11 @@ aloop_24:
 	jsr	delay_12	; 12
 	jsr	delay_12	; 12
 	jsr	delay_12	; 12
+; 60
 	dex			; 2
+; 62
 	bne	aloop		; 2/3
-
+; 65
 
 	;==========================
 	; middle (Switch mode)
@@ -45,26 +47,26 @@ middle_smc4:
 
 
 ; 17
-	nop
-	nop
-	jmp	bloop_24
+	nop			; 2
+	nop			; 2
+	jmp	bloop_24	; 3
+; 24
 
 bloop:
 
 	; update the movement mid-way
 
 	ldy	FRAME				; 3
-        lda	sin_table,Y			; 4+
-        sta	effect_top_smc+1		; 4
+	lda	sin_table,Y			; 4 (aligned)
+	sta	effect_top_smc+1		; 4
+; 11
+	clc					; 2
+	adc	#32	; should this be 31?	; 2
+	sta	effect_bottom_smc+1		; 4
 
-        clc					; 2
-        adc	#32	; should this be 31?	; 2
-        sta	effect_bottom_smc+1		; 4
-					;================
-					;	19
 ; 19
-	nop
-	lda	$00	; nop3
+	nop					; 2
+	lda	$00	; nop3			; 3
 
 bloop_24:
 
@@ -100,9 +102,16 @@ cloop:
 cloop_plus_24:
 	jsr	delay_12	; 12
 	jsr	delay_12	; 12
-	jsr	delay_12	; 12
+; 48
+	nop			; 2
+	nop			; 2
+	nop			; 2
+	nop			; 2
+	nop			; 2
+; 58
 	inx			; 2
-	cpx	#192
+	cpx	#192		; 2
+; 62
 	bcs	cloop		; 2/3
 
 	rts

vaporlock/doubledouble/table/table.c

@@ -8,7 +8,9 @@ int main(int argc, char **argv) {
 
 	for(i=0;i<256;i++) {
 		value=80.0+(sin(i*(2*3.141592653589)/256.0)*78.0);
-		//printf("%d %d\n",i,value);
+		/* HACK to avoid jitter */
+		if (value>157) value=157;
+//		fprintf(stderr,"%d %d\n",i,value);
 		putchar(value);
 	}