mirror of
https://github.com/deater/dos33fsprogs.git
synced 2025-01-11 09:29:51 +00:00
tfv: more optimization, move SCREEN_X to register X
This commit is contained in:
Vince Weaver
parent
5cee1db0b1
commit
4d86457d96
@ -109,16 +109,14 @@ struct cycle_counts {
|
||||
int put_sprite;
|
||||
} cycles;
|
||||
|
||||
static int last_color=0,last_xx=0,last_yy=0;
|
||||
|
||||
static int lookup_map(int xx, int yy) {
|
||||
|
||||
int color,offset;
|
||||
|
||||
last_xx=xx;
|
||||
ram[LAST_SPACEX_I]=xx;
|
||||
xx=xx&MASK_X;
|
||||
|
||||
last_yy=yy;
|
||||
ram[LAST_SPACEY_I]=yy;
|
||||
yy=yy&MASK_Y;
|
||||
|
||||
|
||||
@ -132,7 +130,7 @@ static int lookup_map(int xx, int yy) {
|
||||
|
||||
offset=yy<<3;
|
||||
offset+=xx;
|
||||
cycles.lookup_map+=37;
|
||||
cycles.lookup_map+=39;
|
||||
|
||||
if ((yy>7) || (xx>7)) {
|
||||
cycles.lookup_map+=14;
|
||||
@ -156,8 +154,8 @@ static int lookup_map(int xx, int yy) {
|
||||
|
||||
|
||||
update_cache:
|
||||
cycles.lookup_map+=9;
|
||||
last_color=color;
|
||||
cycles.lookup_map+=10;
|
||||
ram[LAST_MAP_COLOR]=color;
|
||||
return color;
|
||||
}
|
||||
|
||||
@ -789,29 +787,18 @@ static void draw_background_mode7(void) {
|
||||
fixed_add(ram[SPACEY_I],ram[SPACEY_F],
|
||||
ram[TEMP_I],ram[TEMP_F],
|
||||
&ram[SPACEY_I],&ram[SPACEY_F]);
|
||||
cycles.mode7+=25;
|
||||
cycles.mode7+=22;
|
||||
if (!displayed) {
|
||||
printf("SPACEY! %x:%x\n",ram[SPACEY_I],ram[SPACEY_F]);
|
||||
}
|
||||
|
||||
// go through all points in this screen line
|
||||
for (ram[SCREEN_X] = 0;
|
||||
ram[SCREEN_X] < LOWRES_W;
|
||||
ram[SCREEN_X]++) {
|
||||
ram[SCREEN_X] = 0;
|
||||
|
||||
while(1) {
|
||||
// get a pixel from the tile and put it on the screen
|
||||
|
||||
/* cache last value */
|
||||
cycles.mode7+=9;
|
||||
if (ram[SPACEY_I]==last_yy) {
|
||||
cycles.mode7+=8;
|
||||
if (ram[SPACEX_I]==last_xx) {
|
||||
cycles.mode7+=6;
|
||||
map_color=last_color;
|
||||
goto match;
|
||||
}
|
||||
}
|
||||
|
||||
nomatch:
|
||||
map_color=lookup_map(ram[SPACEX_I],ram[SPACEY_I]);
|
||||
cycles.mode7+=6;
|
||||
match:
|
||||
@ -839,7 +826,24 @@ match:
|
||||
fixed_add(ram[SPACEY_I],ram[SPACEY_F],
|
||||
ram[DY_I],ram[DY_F],
|
||||
&ram[SPACEY_I],&ram[SPACEY_F]);
|
||||
cycles.mode7+=49;
|
||||
|
||||
ram[SCREEN_X]++;
|
||||
if (ram[SCREEN_X] >= LOWRES_W) break;
|
||||
cycles.mode7+=43;
|
||||
|
||||
|
||||
/* cache last value */
|
||||
cycles.mode7+=8;
|
||||
if (ram[SPACEY_I]==ram[LAST_SPACEY_I]) {
|
||||
cycles.mode7+=7;
|
||||
if (ram[SPACEX_I]==ram[LAST_SPACEX_I]) {
|
||||
cycles.mode7+=4;
|
||||
map_color=ram[LAST_MAP_COLOR];
|
||||
goto match;
|
||||
}
|
||||
}
|
||||
goto nomatch;
|
||||
|
||||
}
|
||||
|
||||
ram[SCREEN_Y]+=1;
|
||||
|
||||
@ -146,5 +146,17 @@ Add some self-modifying code to inner loop:
|
||||
Total = 205,761
|
||||
Frame Rate = 4.86 fps
|
||||
|
||||
More self-modifying code, also move SCREEN_X to X register
|
||||
Cycles: flying= 187
|
||||
Cycles: getkey= 46
|
||||
Cycles: page_flip= 26
|
||||
Cycles: multiply= 49,613
|
||||
Cycles: mode7= 118,034
|
||||
Cycles: lookup_map= 22,747
|
||||
Cycles: put_sprite= 2,561
|
||||
================================
|
||||
Total = 193,214
|
||||
Frame Rate = 5.18 fps
|
||||
|
||||
32*40=12800
|
||||
Each cycle removed from inner X loop saves
|
||||
32*40=1280 cycles
|
||||
|
||||
@ -919,7 +919,7 @@ odd_branch:
|
||||
;==========
|
||||
; 28
|
||||
|
||||
clc ; fixed_add(&space_y,&temp,&space_y); ; 2
|
||||
clc ; fixed_add(&space_y,&temp,&space_y); ; 2
|
||||
lda SPACEY_F ; 3
|
||||
; adc TEMP_F ;
|
||||
adc RESULT+1 ; 3
|
||||
@ -931,23 +931,12 @@ odd_branch:
|
||||
|
||||
; brk ; space_y = f7:04
|
||||
|
||||
lda #0 ; 2
|
||||
sta SCREEN_X ; 3
|
||||
ldx #0 ; was SCREEN_X ; 2
|
||||
;==========
|
||||
; 25
|
||||
; 22
|
||||
screenx_loop:
|
||||
|
||||
; cache color and return if same as last time
|
||||
lda SPACEY_I ; 3
|
||||
cmp LAST_SPACEY_I ; 3
|
||||
bne nomatch ; 2nt/3
|
||||
lda SPACEX_I ; 3
|
||||
cmp LAST_SPACEX_I ; 3
|
||||
bne nomatch ; 2nt/3
|
||||
lda LAST_MAP_COLOR ; 3
|
||||
jmp match ; 3
|
||||
;===========
|
||||
; 22
|
||||
|
||||
nomatch:
|
||||
; do a full lookup, takes much longer
|
||||
jsr lookup_map ; get color in A ; 6
|
||||
@ -1000,13 +989,29 @@ dyi_label:
|
||||
adc #0 ; 2
|
||||
sta SPACEY_I ; 3
|
||||
|
||||
inc SCREEN_X ; 5
|
||||
lda SCREEN_X ; 3
|
||||
cmp #40 ; LOWRES width ; 2
|
||||
bne screenx_loop ; 2nt/3
|
||||
inx ;inc SCREEN_X ; 2
|
||||
cpx #40 ; LOWRES width ; 2
|
||||
beq done_screenx_loop ; 2nt/3
|
||||
;=============
|
||||
; 49
|
||||
; 43
|
||||
|
||||
|
||||
; cache color and return if same as last time
|
||||
lda SPACEY_I ; 3
|
||||
spacey_label:
|
||||
cmp #0 ; LAST_SPACEY_I ; 2
|
||||
bne nomatch ; 2nt/3
|
||||
lda SPACEX_I ; 3
|
||||
spacex_label:
|
||||
cmp #0 ; LAST_SPACEX_I ; 2
|
||||
bne nomatch ; 2nt/3
|
||||
map_color_label:
|
||||
lda #0 ; LAST_MAP_COLOR ; 2
|
||||
jmp match ; 3
|
||||
;===========
|
||||
; max 19
|
||||
|
||||
done_screenx_loop:
|
||||
inc SCREEN_Y ; 5
|
||||
lda SCREEN_Y ; 3
|
||||
cmp #40 ; LOWRES height ; 2
|
||||
@ -1041,13 +1046,13 @@ lookup_map:
|
||||
;nomatch:
|
||||
lda SPACEX_I ; 3
|
||||
;nomatch2:
|
||||
sta LAST_SPACEX_I ; 3
|
||||
sta spacex_label+1 ; LAST_SPACEX_I ; 4
|
||||
and #CONST_MAP_MASK_X ; 2
|
||||
sta SPACEX_I ; 3
|
||||
tay ; 2
|
||||
|
||||
lda SPACEY_I ; 3
|
||||
sta LAST_SPACEY_I ; 3
|
||||
sta spacey_label+1 ; LAST_SPACEY_I ; 4
|
||||
and #CONST_MAP_MASK_Y ; wrap to 64x64 grid ; 2
|
||||
sta SPACEY_I ; 3
|
||||
|
||||
@ -1062,7 +1067,7 @@ lookup_map:
|
||||
; SPACEX_I is in y
|
||||
cpy #$8 ; 2
|
||||
;============
|
||||
; 37
|
||||
; 39
|
||||
|
||||
bcs ocean_color ; bgt 8 ;^2nt/3
|
||||
ldy SPACEY_I ; 3
|
||||
@ -1080,7 +1085,7 @@ ocean_color:
|
||||
lda water_map,Y ; the color of the sea ; 4
|
||||
|
||||
update_cache:
|
||||
sta LAST_MAP_COLOR ; 3
|
||||
sta map_color_label+1 ; self-modifying ; 4
|
||||
rts ; 6
|
||||
|
||||
flying_map:
|
||||
|
||||
Loading…
x
Reference in New Issue
Block a user