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tfv: some more minor speedups

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This commit is contained in:
Vince Weaver 2017-11-26 19:20:58 -05:00
parent d3726761a6
commit 0f100138f1
4 changed files with 42 additions and 26 deletions
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12
gr-sim/tfv_flying_6502.c
View File

@ -661,15 +661,16 @@ static void draw_background_mode7(void) {
ram[FACTOR_I],ram[FACTOR_F]);
}
cycles.mode7+=11;
ram[SCREEN_Y]=8;
cycles.mode7+=16;
do {
y=0;
hlin_setup(ram[DRAW_PAGE],y,0,ram[SCREEN_Y]);
cycles.mode7+=39;
cycles.mode7+=33;
// then calculate the horizontal scale, or the distance between
// space points on this horizontal line
@ -688,15 +689,17 @@ static void draw_background_mode7(void) {
ram[HORIZ_SCALE_I],ram[HORIZ_SCALE_F]);
}
//mul2 // calculate the distance of the line we are drawing
fixed_mul(ram[HORIZ_SCALE_I],ram[HORIZ_SCALE_F],
CONST_SCALE_I,CONST_SCALE_F,
&ram[DISTANCE_I],&ram[DISTANCE_F],0);
cycles.mode7+=34;
cycles.mode7+=27;
if (!displayed) {
printf("DISTANCE %x:%x\n",ram[DISTANCE_I],ram[DISTANCE_F]);
}
// calculate the dx and dy of points in space when we step
// through all points on this line
ram[DX_I]=fixed_sin[(ram[ANGLE]+8)&0xf].i; // -sin()
@ -725,6 +728,7 @@ static void draw_background_mode7(void) {
printf("DY %x:%x\n",ram[DY_I],ram[DY_F]);
}
// calculate the starting position
fixed_add(ram[DISTANCE_I],ram[DISTANCE_F],
ram[FACTOR_I],ram[FACTOR_F],

14
tfv/OPTIMIZATION
View File

@ -122,3 +122,17 @@ Remove some unnecessary zero page copies in the mode7 code
Total = 215,420
Frame Rate = 4.64 fps
A few more minor cleanups in the Y loop
Cycles: flying= 187
Cycles: getkey= 46
Cycles: page_flip= 26
Cycles: multiply= 49,613
Cycles: mode7= 140,858
Cycles: lookup_map= 21,718
Cycles: put_sprite= 2,561
===============================
Total = 215,009
Frame Rate = 4.65 fps
32*40=12800

1
tfv/TODO
View File

@ -4,6 +4,7 @@ mode7 speed fixes:
result
+ Skip key parsing if no key read
+ Self modifying code on the adds in inner loop
short term:

41
tfv/tfv_flying.s
View File

@ -497,7 +497,7 @@ draw_ship_left:
sta YPOS ; 3
jsr put_sprite ; 6
;===========
; 28
; 28
no_left_splash:
; Draw Shadow
@ -624,23 +624,20 @@ no_draw_sky:
;; GOOD 4 80 * ffffffff 80 = fffffffd c0
;; BAD 4 80 * ffffffff 80 = 42 40
lda #$f0 ; 2
sta COLOR_MASK ; 3
lda #8 ; 2
sta SCREEN_Y ; 3
;=============
; 11
; 16
screeny_loop:
tay ; y=A ; 2
and #$1 ; 2
bne screeny_odd ; 2nt/3
screeny_even:
lda #$0f ; 2
bne screeny_continue ; 3
screeny_odd:
tya ; 2
and #$fe ; 2
tay ; 2
lda #$f0 ; 2
screeny_continue:
tay ; y=A ; 2
lda COLOR_MASK ; 3
eor #$ff ; 2
sta COLOR_MASK ; 3
lda gr_offsets,Y ; lookup low-res memory address ; 4
@ -653,17 +650,16 @@ screeny_continue:
sta GBASH ; 3
;=============
; 39/35
; 33
; horizontal_scale.i *ALWAYS* = 0
lda #0 ; horizontal_scale.i = 0 ; 2
sta HORIZ_SCALE_I ; 3
; unsigned char horizontal_lookup[7][32];
;horizontal_scale.f=
; horizontal_lookup[space_z.i&0xf][(screen_y-8)/2];
; horizontal_lookup[(space_z<<5)+(screen_y-8)]
lda SPACEZ_I ; 3
; and #$f ;
; FIXME: would it be faster to ROR 4 times?
asl ; 2
asl ; 2
@ -679,17 +675,18 @@ screeny_continue:
adc TEMP_I ; 3
tay ; 2
lda horizontal_lookup,Y ; 4
sta HORIZ_SCALE_F ; 3
; sta HORIZ_SCALE_F ;
sta NUM1L ; 3
;============
; 37
;; brk ASM, horiz_scale = 00:73
; mul2
; calculate the distance of the line we are drawing
; fixed_mul(&horizontal_scale,&scale,&distance);
lda HORIZ_SCALE_I ; 3
lda #0 ;HORIZ_SCALE_I ; 2
sta NUM1H ; 3
lda HORIZ_SCALE_F ; 3
sta NUM1L ; 3
;lda HORIZ_SCALE_F ;
;sta NUM1L ;
lda #CONST_SCALE_I ; SCALE_I ; 2
sta NUM2H ; 3
lda #CONST_SCALE_F ; SCALE_F ; 2
@ -699,7 +696,7 @@ screeny_continue:
sta DISTANCE_I ; 2
stx DISTANCE_F ; 2
;==========
; 34
; 27
;; brk ASM, distance = 08:fc
; calculate the dx and dy of points in space when we step