mirror of
https://github.com/deater/dos33fsprogs.git
synced 2025-01-12 15:30:55 +00:00
dlowres: split up the aux and standard code
this is all a big hack
This commit is contained in:
Vince Weaver
parent
5885ad8557
commit
6a408034c9
@ -35,7 +35,7 @@ flying_start:
|
||||
sta EIGHTYCOL ; 80col C00d
|
||||
lda AN3 ; AN3 C05E
|
||||
|
||||
jsr page_flip
|
||||
; jsr page_flip
|
||||
|
||||
jsr init_multiply_tables
|
||||
|
||||
@ -226,7 +226,7 @@ check_land:
|
||||
|
||||
landing_loop:
|
||||
|
||||
jsr draw_background_mode7
|
||||
jsr draw_background_mode7_standard
|
||||
|
||||
; Draw Shadow
|
||||
lda #>shadow_forward
|
||||
@ -253,7 +253,7 @@ landing_loop:
|
||||
sta YPOS
|
||||
jsr put_sprite
|
||||
|
||||
jsr page_flip
|
||||
; jsr page_flip
|
||||
|
||||
dec SPACEZ_I
|
||||
jsr update_z_factor
|
||||
@ -359,8 +359,8 @@ speed_loop:
|
||||
; Draw the background
|
||||
;====================
|
||||
draw_background:
|
||||
jsr draw_background_mode7 ; 6
|
||||
; jsr draw_background_mode7 ; 6
|
||||
jsr draw_background_mode7_standard ; 6
|
||||
jsr draw_background_mode7_aux ; 6
|
||||
|
||||
check_over_water:
|
||||
; See if we are over water
|
||||
@ -556,7 +556,7 @@ draw_ship:
|
||||
; flip pages
|
||||
;==================
|
||||
|
||||
jsr page_flip ; 6
|
||||
; jsr page_flip ; 6
|
||||
|
||||
;==================
|
||||
; loop forever
|
||||
@ -583,6 +583,7 @@ update_z_factor:
|
||||
sec ; 2
|
||||
sbc #8 ; 2
|
||||
sta spacez_shifted+1 ; 4
|
||||
sta spacez_shifted_aux+1 ; 4
|
||||
|
||||
|
||||
lda SPACEZ_F ; 3
|
||||
@ -604,11 +605,18 @@ update_z_factor:
|
||||
; 60
|
||||
|
||||
|
||||
;===========================
|
||||
; Draw the Mode7 Background
|
||||
;===========================
|
||||
|
||||
draw_background_mode7:
|
||||
|
||||
|
||||
;=======================================
|
||||
; Draw the Mode7 Background -- Standard
|
||||
;=======================================
|
||||
|
||||
draw_background_mode7_standard:
|
||||
|
||||
; Set Normal Page
|
||||
|
||||
bit PAGE0
|
||||
|
||||
; Only draw sky if necessary
|
||||
; (at start, or if we have switched to text, we never overwrite it)
|
||||
@ -622,7 +630,7 @@ draw_background_mode7:
|
||||
|
||||
dec DRAW_SKY ; usually 2 as we redraw both pages ; 5
|
||||
|
||||
bit PAGE0
|
||||
|
||||
lda #COLOR_BOTH_MEDIUMBLUE ; MEDIUMBLUE color ; 2
|
||||
sta COLOR ; 3
|
||||
lda #0 ; 2
|
||||
@ -643,29 +651,8 @@ sky_loop: ; draw line across screen
|
||||
;=============
|
||||
; (23+63+(X*16))*5
|
||||
|
||||
bit PAGE1
|
||||
lda #AUX_BOTH_MEDIUMBLUE ; MEDIUMBLUE color ; 2
|
||||
sta COLOR ; 3
|
||||
lda #0 ; 2
|
||||
;===========
|
||||
; 11
|
||||
|
||||
sky_loop2: ; draw line across screen
|
||||
ldy #39 ; from y=0 to y=6 ; 2
|
||||
sty V2 ; 3
|
||||
ldy #0 ; 2
|
||||
pha ; 3
|
||||
jsr hlin_double ; hlin y,V2 at A ; 63+(X*16)
|
||||
pla ; 4
|
||||
clc ; 2
|
||||
adc #2 ; 2
|
||||
cmp #6 ; 2
|
||||
bne sky_loop2 ; 3/2nt
|
||||
;=============
|
||||
; (23+63+(X*16))*5
|
||||
|
||||
; Draw Hazy Horizon
|
||||
bit PAGE0
|
||||
lda #COLOR_BOTH_GREY ; Horizon is Grey ; 2
|
||||
sta COLOR ; 3
|
||||
lda #6 ; draw single line at 6/7 ; 2
|
||||
@ -675,19 +662,6 @@ sky_loop2: ; draw line across screen
|
||||
jsr hlin_double ; hlin 0,40 at 6 ; 63+(X*16)
|
||||
;===========
|
||||
; 63+(X*16)+14
|
||||
; Draw Hazy Horizon
|
||||
bit PAGE1
|
||||
lda #AUX_BOTH_GREY ; Horizon is Grey ; 2
|
||||
sta COLOR ; 3
|
||||
lda #6 ; draw single line at 6/7 ; 2
|
||||
ldy #39 ; 2
|
||||
sty V2 ; hlin Y,V2 at A ; 3
|
||||
ldy #0 ; 2
|
||||
jsr hlin_double ; hlin 0,40 at 6 ; 63+(X*16)
|
||||
;===========
|
||||
; 63+(X*16)+14
|
||||
|
||||
|
||||
no_draw_sky:
|
||||
|
||||
; setup initial odd/even color mask
|
||||
@ -723,8 +697,8 @@ setup_gr_addr:
|
||||
iny ; point to high part of address ; 2
|
||||
|
||||
lda gr_offsets,Y ; load high part of address ; 4
|
||||
clc ; clear carry for add ; 2
|
||||
adc DRAW_PAGE ; add in draw page offset ; 3
|
||||
; clc ; clear carry for add ; 2
|
||||
; adc DRAW_PAGE ; add in draw page offset ; 3
|
||||
sta GBASH ; store in GBASH zero-page pointer ; 3
|
||||
|
||||
;=============
|
||||
@ -1066,22 +1040,16 @@ update_cache:
|
||||
;===========
|
||||
; 4
|
||||
|
||||
; rts ; 6
|
||||
|
||||
|
||||
|
||||
; jsr lookup_map ; get color in A ; 6
|
||||
; ;============
|
||||
; 6
|
||||
match:
|
||||
|
||||
ldy DISP_PAGE
|
||||
beq mask_label
|
||||
tay
|
||||
and #$01
|
||||
cmp #$01
|
||||
tya
|
||||
ror ; adjust for 80-column color
|
||||
; ldy DISP_PAGE
|
||||
; beq mask_label
|
||||
; tay
|
||||
; and #$01
|
||||
; cmp #$01
|
||||
; tya
|
||||
; ror ; adjust for 80-column color
|
||||
|
||||
|
||||
mask_label:
|
||||
@ -1163,12 +1131,541 @@ done_screeny:
|
||||
rts ; 6
|
||||
|
||||
|
||||
|
||||
;=======================================
|
||||
;=======================================
|
||||
; Draw the Mode7 Background -- AUX
|
||||
;=======================================
|
||||
;=======================================
|
||||
|
||||
draw_background_mode7_aux:
|
||||
|
||||
; Draw to AUX page
|
||||
|
||||
bit PAGE1
|
||||
|
||||
; Only draw sky if necessary
|
||||
; (at start, or if we have switched to text, we never overwrite it)
|
||||
|
||||
lda DRAW_SKY ; 3
|
||||
beq no_draw_sky_aux ;^2nt/3
|
||||
;==============
|
||||
; 6
|
||||
; Draw Sky
|
||||
; not performance critical as this happens rarely
|
||||
|
||||
dec DRAW_SKY ; usually 2 as we redraw both pages ; 5
|
||||
|
||||
|
||||
lda #AUX_BOTH_MEDIUMBLUE ; MEDIUMBLUE color ; 2
|
||||
sta COLOR ; 3
|
||||
lda #0 ; 2
|
||||
;===========
|
||||
; 11
|
||||
|
||||
sky_loop_aux: ; draw line across screen
|
||||
ldy #39 ; from y=0 to y=6 ; 2
|
||||
sty V2 ; 3
|
||||
ldy #0 ; 2
|
||||
pha ; 3
|
||||
jsr hlin_double ; hlin y,V2 at A ; 63+(X*16)
|
||||
pla ; 4
|
||||
clc ; 2
|
||||
adc #2 ; 2
|
||||
cmp #6 ; 2
|
||||
bne sky_loop_aux ; 3/2nt
|
||||
;=============
|
||||
; (23+63+(X*16))*5
|
||||
|
||||
; Draw Hazy Horizon
|
||||
lda #AUX_BOTH_GREY ; Horizon is Grey ; 2
|
||||
sta COLOR ; 3
|
||||
lda #6 ; draw single line at 6/7 ; 2
|
||||
ldy #39 ; 2
|
||||
sty V2 ; hlin Y,V2 at A ; 3
|
||||
ldy #0 ; 2
|
||||
jsr hlin_double ; hlin 0,40 at 6 ; 63+(X*16)
|
||||
;===========
|
||||
; 63+(X*16)+14
|
||||
|
||||
|
||||
no_draw_sky_aux:
|
||||
|
||||
; setup initial odd/even color mask
|
||||
lda #$f0 ; 2
|
||||
sta COLOR_MASK ; 3
|
||||
|
||||
; start Y at 8 (below horizon line)
|
||||
lda #8 ; 2
|
||||
sta SCREEN_Y ; 3
|
||||
;=============
|
||||
; 10
|
||||
|
||||
screeny_loop_aux:
|
||||
and #$fe ; be sure SCREEN_Y used later is even ; 2
|
||||
tay ; put in Y for lookup table later ; 2
|
||||
|
||||
lda COLOR_MASK ; flip mask for odd/even row plotting ; 3
|
||||
eor #$ff ; 2
|
||||
sta COLOR_MASK ; 3
|
||||
sta mask_label_aux+1 ; setup self-modifying code ; 4
|
||||
|
||||
eor #$ff ; setup self-modifying branch later ; 2
|
||||
bmi odd_branch_aux ; beq is $f0 (too clever FIXME) ; 2nt/3
|
||||
lda #$d0 ; bne is $d0 ; 2
|
||||
odd_branch_aux:
|
||||
sta mask_branch_label_aux ; actually update branch ; 4
|
||||
;============
|
||||
; 27
|
||||
|
||||
setup_gr_addr_aux:
|
||||
lda gr_offsets,Y ; lookup low-res memory row address ; 4
|
||||
sta GBASL ; store in GBASL zero-page pointer ; 3
|
||||
iny ; point to high part of address ; 2
|
||||
|
||||
lda gr_offsets,Y ; load high part of address ; 4
|
||||
; clc ; clear carry for add ; 2
|
||||
; adc DRAW_PAGE ; add in draw page offset ; 3
|
||||
sta GBASH ; store in GBASH zero-page pointer ; 3
|
||||
|
||||
;=============
|
||||
; 21
|
||||
|
||||
calc_horizontal_scale_aux:
|
||||
|
||||
; Calculate the horizontal scale using a lookup table
|
||||
|
||||
; horizontal_scale.i *ALWAYS* = 0
|
||||
|
||||
; 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)]
|
||||
|
||||
|
||||
clc ; 2
|
||||
lda SCREEN_Y ; 3
|
||||
spacez_shifted_aux:
|
||||
adc #0 ; self-modify, loads (spacez<<5)-8 ; 2
|
||||
tay ; 2
|
||||
lda horizontal_lookup,Y ; 4
|
||||
sta NUM1L ; HORIZ_SCALE_F is input to next mul ; 3
|
||||
;============
|
||||
; 16
|
||||
|
||||
; mul2
|
||||
; calculate the distance of the line we are drawing
|
||||
; fixed_mul(&horizontal_scale,&scale,&distance);
|
||||
lda #0 ; HORIZ_SCALE_I is always zero ; 2
|
||||
sta NUM1H ; 3
|
||||
; NUM1L was set to HORIZ_SCALE_F previously ;
|
||||
lda #CONST_SCALE_I ; SCALE_I ; 2
|
||||
sta NUM2H ; 3
|
||||
lda #CONST_SCALE_F ; SCALE_F ; 2
|
||||
sta NUM2L ; 3
|
||||
sec ; don't reuse previous settings ; 2
|
||||
jsr multiply ; 6
|
||||
stx DISTANCE_I ; 2
|
||||
sta DISTANCE_F ; 2
|
||||
;==========
|
||||
; 27
|
||||
|
||||
; calculate the dx and dy to add to points in space
|
||||
; we add to the starting values on each row to get the next
|
||||
; space values
|
||||
|
||||
; dx.i=fixed_sin[(angle+8)&0xf].i // -sin()
|
||||
lda ANGLE ; 3
|
||||
clc ; 2
|
||||
adc #8 ; 2
|
||||
and #$f ; 2
|
||||
asl ; 2
|
||||
tay ; 2
|
||||
lda fixed_sin,Y ; load integer half ; 4
|
||||
sta NUM2H ; use as source in upcomnig mul ; 3
|
||||
|
||||
|
||||
; dx.f=fixed_sin[(angle+8)&0xf].f; // -sin()
|
||||
iny ; point to float half ; 2
|
||||
lda fixed_sin,Y ; load it from lookup table ; 4
|
||||
sta NUM2L ; use as source in upcoming mul ; 3
|
||||
;==========
|
||||
; 29
|
||||
|
||||
;mul3
|
||||
; fixed_mul(&dx,&horizontal_scale,&dx);
|
||||
|
||||
; DX_I:DX_F already set in NUM2H:NUM2L
|
||||
clc ; reuse HORIZ_SCALE in NUM1 ; 2
|
||||
jsr multiply ; 6
|
||||
stx DX_I ; 3
|
||||
sta DX_F ; 3
|
||||
;==========
|
||||
; 14
|
||||
|
||||
; dy.i=fixed_sin[(angle+4)&0xf].i; // cos()
|
||||
|
||||
lda ANGLE ; 3
|
||||
clc ; 2
|
||||
adc #4 ; 2
|
||||
and #$f ; 2
|
||||
asl ; 2
|
||||
tay ; 2
|
||||
lda fixed_sin,Y ; load integer half ; 4
|
||||
sta NUM2H ; use as source in upcoming mul ; 3
|
||||
|
||||
; dy.f=fixed_sin[(angle+4)&0xf].f; // cos()
|
||||
|
||||
iny ; point to float half ; 2
|
||||
lda fixed_sin,Y ; load from lookup table ; 4
|
||||
sta NUM2L ; use as source in upcoming mul ; 3
|
||||
;==========
|
||||
; 29
|
||||
;mul4
|
||||
; fixed_mul(&dy,&horizontal_scale,&dy);
|
||||
|
||||
; DY_I:DY_F already in NUM2H:NUM2L
|
||||
clc ; reuse horiz_scale in num1 ; 2
|
||||
jsr multiply ; 6
|
||||
stx DY_I ; 3
|
||||
sta DY_F ; 3
|
||||
;==========
|
||||
; 14
|
||||
|
||||
;=================================
|
||||
; calculate the starting position
|
||||
;=================================
|
||||
|
||||
; fixed_add(&distance,&factor,&space_x);
|
||||
clc ; fixed_add(&distance,&factor,&space_y); ; 2
|
||||
lda DISTANCE_F ; 3
|
||||
adc FACTOR_F ; 3
|
||||
sta SPACEY_F ; 3
|
||||
sta SPACEX_F ; 3
|
||||
|
||||
lda DISTANCE_I ; 3
|
||||
adc FACTOR_I ; 3
|
||||
sta SPACEY_I ; 3
|
||||
sta SPACEX_I ; 3
|
||||
;==========
|
||||
; 26
|
||||
|
||||
|
||||
; temp.i=fixed_sin[(angle+4)&0xf].i; // cos()
|
||||
|
||||
lda ANGLE ; 3
|
||||
clc ; 2
|
||||
adc #4 ; 2
|
||||
and #$f ; 2
|
||||
asl ; 2
|
||||
tay ; 2
|
||||
lda fixed_sin,Y ; 4
|
||||
sta NUM2H ; store as source for next mul ; 3
|
||||
|
||||
|
||||
; temp.f=fixed_sin[(angle+4)&0xf].f; // cos()
|
||||
iny ; 2
|
||||
lda fixed_sin,Y ; 4
|
||||
sta NUM2L ; store as source for next mul ; 3
|
||||
;==========
|
||||
; 29
|
||||
|
||||
; mul5
|
||||
; fixed_mul(&space_x,&temp,&space_x);
|
||||
lda SPACEX_I ; 3
|
||||
sta NUM1H ; 3
|
||||
lda SPACEX_F ; 3
|
||||
sta NUM1L ; 3
|
||||
; NUM2H:NUM2L already set above
|
||||
sec ; don't reuse previous NUM1 ; 2
|
||||
jsr multiply ; 6
|
||||
; SPACEX_I in X ;
|
||||
; SPACEX_F in A ;
|
||||
;==========
|
||||
; 20
|
||||
|
||||
; fixed_add(&space_x,&cx,&space_x);
|
||||
clc ; 2
|
||||
; SPACEX_F still in A ;
|
||||
adc CX_F ; 3
|
||||
sta SPACEX_F ; 3
|
||||
txa ; SPACEX_I was in X ; 2
|
||||
adc CX_I ; 3
|
||||
sta SPACEX_I ; 3
|
||||
;===========
|
||||
; 16
|
||||
|
||||
|
||||
; temp.i=fixed_sin[angle&0xf].i; // sin()
|
||||
lda ANGLE ; 3
|
||||
and #$f ; 2
|
||||
asl ; 2
|
||||
tay ; 2
|
||||
lda fixed_sin,Y ; 4
|
||||
sta NUM2H ; store for next mul ; 3
|
||||
|
||||
; fixed_temp.f=fixed_sin[angle&0xf].f; // sin()
|
||||
iny ; 2
|
||||
lda fixed_sin,Y ; 4
|
||||
sta NUM2L ; store for next mul ; 3
|
||||
;==========
|
||||
; 25
|
||||
|
||||
;mul6
|
||||
; fixed_mul(&space_y,&fixed_temp,&space_y);
|
||||
lda SPACEY_I ; 3
|
||||
sta NUM1H ; 3
|
||||
lda SPACEY_F ; 3
|
||||
sta NUM1L ; 3
|
||||
; NUM2H:NUM2L already set
|
||||
sec ; don't reuse previous num1 ; 2
|
||||
jsr multiply ; 6
|
||||
; SPACEY_I in X ;
|
||||
; SPACEY_F in A ;
|
||||
;==========
|
||||
; 20
|
||||
|
||||
; fixed_add(&space_y,&cy,&space_y);
|
||||
clc ; 2
|
||||
; SPACEY_F in A
|
||||
adc CY_F ; 3
|
||||
sta SPACEY_F ; 3
|
||||
txa ; SPACEY_I in X ; 2
|
||||
adc CY_I ; 3
|
||||
sta SPACEY_I ; 3
|
||||
;==========
|
||||
; 16
|
||||
; mul7
|
||||
; fixed_mul(&lowres_half,&dx,&temp);
|
||||
lda #CONST_LOWRES_HALF_I ; 2
|
||||
sta NUM1H ; 3
|
||||
lda #CONST_LOWRES_HALF_F ; 2
|
||||
sta NUM1L ; 3
|
||||
lda DX_I ; 3
|
||||
sta NUM2H ; 3
|
||||
sta dxi_label_aux+1 ; for self modify ; 4
|
||||
lda DX_F ; 3
|
||||
sta dxf_label_aux+1 ; for self modify ; 4
|
||||
sta NUM2L ; 3
|
||||
sec ; don't reuse previous num1 ; 2
|
||||
jsr multiply ; 6
|
||||
; TEMP_I in X ;
|
||||
; TEMP_F in A ;
|
||||
;==========
|
||||
; 38
|
||||
|
||||
|
||||
; fixed_add(&space_x,&temp,&space_x);
|
||||
clc ; 2
|
||||
; TEMP_F in A
|
||||
adc SPACEX_F ; 3
|
||||
sta SPACEX_F ; 3
|
||||
txa ; TEMP_I in X ; 2
|
||||
adc SPACEX_I ; 3
|
||||
sta SPACEX_I ; 3
|
||||
;==========
|
||||
; 16
|
||||
|
||||
;mul8
|
||||
; fixed_mul(&fixed_temp,&dy,&fixed_temp);
|
||||
lda DY_I ; 3
|
||||
sta NUM2H ; 3
|
||||
sta dyi_label_aux+1 ; for self modify ; 4
|
||||
lda DY_F ; 3
|
||||
sta NUM2L ; 3
|
||||
sta dyf_label_aux+1 ; for self modify ; 4
|
||||
clc ; reuse CONST_LOWRES_HALF from last time ; 2
|
||||
jsr multiply ; 6
|
||||
; TEMP_I in X
|
||||
; TEMP_F in A
|
||||
;==========
|
||||
; 28
|
||||
|
||||
; fixed_add(&space_y,&temp,&space_y);
|
||||
clc ; 2
|
||||
; TEMP_F in A
|
||||
adc SPACEY_F ; 3
|
||||
sta SPACEY_F ; 3
|
||||
|
||||
txa ; TEMP_I in X ; 2
|
||||
adc SPACEY_I ; 3
|
||||
sta SPACEY_I ; 3
|
||||
|
||||
;==========
|
||||
; 16
|
||||
|
||||
|
||||
ldx #40 ; was SCREEN_X ; 2
|
||||
;==========
|
||||
; 2
|
||||
;===================================================
|
||||
; SCREEN_X LOOP!!!!
|
||||
; every cycle in here counts for 32*40=1280 cycles
|
||||
;===================================================
|
||||
screenx_loop_aux:
|
||||
|
||||
|
||||
nomatch_aux:
|
||||
;====================================
|
||||
; do a full lookup, takes much longer
|
||||
; used to be a separate function but we inlined it here
|
||||
|
||||
;====================
|
||||
; lookup_map
|
||||
;====================
|
||||
; finds value in space_x.i,space_y.i
|
||||
; returns color in A
|
||||
; CLOBBERS: A,Y
|
||||
|
||||
lda SPACEX_I ; 3
|
||||
sta spacex_label_aux+1 ; self modifying code, LAST_SPACEX_I ; 4
|
||||
and #CONST_MAP_MASK_X ; wrap at 64 ; 2
|
||||
sta SPACEX_I ; store i patch out ; 3
|
||||
tay ; copy to Y for later ; 2
|
||||
|
||||
lda SPACEY_I ; 3
|
||||
sta spacey_label_aux+1 ; self modifying code, LAST_SPACEY_I ; 4
|
||||
and #CONST_MAP_MASK_Y ; wrap to 64x64 grid ; 2
|
||||
sta SPACEY_I ; 3
|
||||
|
||||
asl ; 2
|
||||
asl ; 2
|
||||
asl ; multiply by 8 ; 2
|
||||
clc ; 2
|
||||
adc SPACEX_I ; add in X value ; 3
|
||||
; only valid if x<8 and y<8
|
||||
|
||||
; SPACEX_I is also in y
|
||||
cpy #$8 ; 2
|
||||
;============
|
||||
; 39
|
||||
|
||||
bcs ocean_color_aux ; bgt 8 ; 2nt/3
|
||||
ldy SPACEY_I ; 3
|
||||
cpy #$8 ; 2
|
||||
;=============
|
||||
; 7
|
||||
|
||||
bcs ocean_color_aux ; bgt 8 ; 2nt/3
|
||||
|
||||
tay ; 2
|
||||
lda flying_map_aux,Y ; load from array ; 4
|
||||
|
||||
bcc update_cache_aux ; 3
|
||||
;============
|
||||
; 11
|
||||
ocean_color_aux:
|
||||
and #$1f ; 2
|
||||
tay ; 2
|
||||
lda water_map_aux,Y ; the color of the sea ; 4
|
||||
;===========
|
||||
; 8
|
||||
|
||||
update_cache_aux:
|
||||
sta map_color_label_aux+1 ; self-modifying ; 4
|
||||
|
||||
;===========
|
||||
; 4
|
||||
|
||||
|
||||
match_aux:
|
||||
|
||||
; ldy DISP_PAGE
|
||||
; beq mask_label_aux
|
||||
; tay
|
||||
; and #$01
|
||||
; cmp #$01
|
||||
; tya
|
||||
; ror ; adjust for 80-column color
|
||||
|
||||
|
||||
mask_label_aux:
|
||||
and #0 ; COLOR_MASK (self modifying) ; 2
|
||||
|
||||
ldy #0 ; 2
|
||||
mask_branch_label_aux:
|
||||
beq big_bottom_aux ; this branch is modified based on odd/even
|
||||
; F0=beq, D0=bne ; 2nt/3
|
||||
|
||||
ora (GBASL),Y ; we're odd, or the bottom in ; 5
|
||||
big_bottom_aux:
|
||||
|
||||
sta (GBASL),Y ; plot double height pixel ; 6
|
||||
inc GBASL ; point to next pixel ; 5
|
||||
;============
|
||||
; 22/18
|
||||
|
||||
|
||||
|
||||
; advance to the next position in space
|
||||
|
||||
; fixed_add(&space_x,&dx,&space_x);
|
||||
|
||||
clc ; 2
|
||||
lda SPACEX_F ; 3
|
||||
dxf_label_aux:
|
||||
adc #0 ; self modifying, is DX_F ; 2
|
||||
sta SPACEX_F ; 3
|
||||
lda SPACEX_I ; 3
|
||||
dxi_label_aux:
|
||||
adc #0 ; self modifying, is DX_I ; 2
|
||||
sta SPACEX_I ; 3
|
||||
;==========
|
||||
; 18
|
||||
|
||||
; fixed_add(&space_y,&dy,&space_y);
|
||||
|
||||
clc ; 2
|
||||
lda SPACEY_F ; 3
|
||||
dyf_label_aux:
|
||||
adc #0 ; self modifyig, is DY_F ; 2
|
||||
sta SPACEY_F ; 3
|
||||
lda SPACEY_I ; 3
|
||||
dyi_label_aux:
|
||||
adc #0 ; self mofidying is DY_I ; 2
|
||||
sta SPACEY_I ; 3
|
||||
;============
|
||||
; 18
|
||||
|
||||
dex ; decrement SCREEN_X ; 2
|
||||
beq done_screenx_loop_aux ; branch until we've done 40 ; 2nt/3
|
||||
;=============
|
||||
; 4/5
|
||||
|
||||
|
||||
; cache color and return if same as last time
|
||||
lda SPACEY_I ; 3
|
||||
spacey_label_aux:
|
||||
cmp #0 ; self modify, LAST_SPACEY_I ; 2
|
||||
bne nomatch_aux ; 2nt/3
|
||||
lda SPACEX_I ; 3
|
||||
spacex_label_aux:
|
||||
cmp #0 ; self modify, LAST_SPACEX_I ; 2
|
||||
bne nomatch_aux ; 2nt/3
|
||||
map_color_label_aux:
|
||||
lda #0 ; self modify, LAST_MAP_COLOR ; 2
|
||||
jmp match_aux ; 3
|
||||
|
||||
done_screenx_loop_aux:
|
||||
inc SCREEN_Y ; 5
|
||||
lda SCREEN_Y ; 3
|
||||
cmp #40 ; LOWRES height ; 2
|
||||
beq done_screeny_aux ; 2nt/3
|
||||
jmp screeny_loop_aux ; too far to branch ; 3
|
||||
;=============
|
||||
; 15
|
||||
done_screeny_aux:
|
||||
rts ; 6
|
||||
|
||||
|
||||
;====================
|
||||
;====================
|
||||
; lookup_map
|
||||
;====================
|
||||
;====================
|
||||
; finds value in space_x.i,space_y.i
|
||||
; returns color in A
|
||||
; CLOBBERS: A,Y
|
||||
; this is used to check if above water or grass
|
||||
; the high-performance per-pixel version has been inlined
|
||||
lookup_map:
|
||||
@ -1222,6 +1719,20 @@ flying_map:
|
||||
.byte $dd,$cc,$99,$99, $11,$44,$44,$dd
|
||||
.byte $22,$dd,$dd,$dd, $dd,$dd,$dd,$22
|
||||
|
||||
;dd = 1101 1101 > 1110 1110 ee
|
||||
;cc = 1100 1100 > 0110 0110 66
|
||||
;88 > 44
|
||||
;99 1001 1001 > 1100 1100 = cc
|
||||
flying_map_aux:
|
||||
.byte $11,$ff,$ff,$ff, $ff,$ff,$ff,$11
|
||||
.byte $ee,$66,$66,$44, $22,$22,$00,$ee
|
||||
.byte $ee,$66,$66,$66, $44,$22,$22,$ee
|
||||
.byte $ee,$66,$66,$44, $22,$22,$22,$ee
|
||||
.byte $ee,$66,$cc,$cc, $44,$22,$22,$ee
|
||||
.byte $ee,$66,$cc,$44, $22,$22,$22,$ee
|
||||
.byte $ee,$66,$cc,$cc, $88,$22,$22,$ee
|
||||
.byte $11,$ee,$ee,$ee, $ee,$ee,$ee,$11
|
||||
|
||||
|
||||
water_map:
|
||||
.byte $22,$22,$22,$22, $22,$22,$22,$22
|
||||
@ -1229,6 +1740,12 @@ water_map:
|
||||
.byte $22,$22,$22,$22, $22,$22,$22,$22
|
||||
.byte $22,$22,$22,$22, $ee,$22,$22,$22
|
||||
|
||||
water_map_aux:
|
||||
.byte $11,$11,$11,$11, $11,$11,$11,$11
|
||||
.byte $77,$11,$11,$11, $11,$11,$11,$11
|
||||
.byte $11,$11,$11,$11, $11,$11,$11,$11
|
||||
.byte $11,$11,$11,$11, $77,$11,$11,$11
|
||||
|
||||
.include "fast_multiply.s"
|
||||
|
||||
|
||||
|
||||
Binary file not shown.
@ -32,7 +32,7 @@ page_flip:
|
||||
lda DISP_PAGE ; 3
|
||||
beq page_flip_show_1 ; 2nt/3
|
||||
page_flip_show_0:
|
||||
bit PAGE0 ; 4
|
||||
; bit PAGE0 ; 4
|
||||
; lda #4 ; 2
|
||||
lda #0
|
||||
sta DRAW_PAGE ; DRAW_PAGE=1 ; 3
|
||||
@ -40,7 +40,7 @@ page_flip_show_0:
|
||||
sta DISP_PAGE ; DISP_PAGE=0 ; 3
|
||||
rts ; 6
|
||||
page_flip_show_1:
|
||||
bit PAGE1 ; 4
|
||||
; bit PAGE1 ; 4
|
||||
lda #0
|
||||
sta DRAW_PAGE ; DRAW_PAGE=0 ; 3
|
||||
lda #1 ; 2
|
||||
@ -510,19 +510,19 @@ point_to_end_string:
|
||||
; print_both_pages
|
||||
;================================
|
||||
print_both_pages:
|
||||
lda DRAW_PAGE
|
||||
pha
|
||||
; lda DRAW_PAGE
|
||||
; pha
|
||||
|
||||
lda #0
|
||||
sta DRAW_PAGE
|
||||
jsr move_and_print
|
||||
|
||||
lda #4
|
||||
sta DRAW_PAGE
|
||||
jsr move_and_print
|
||||
; lda #4
|
||||
; sta DRAW_PAGE
|
||||
; jsr move_and_print
|
||||
|
||||
pla
|
||||
sta DRAW_PAGE
|
||||
; pla
|
||||
; sta DRAW_PAGE
|
||||
|
||||
rts ; oops forgot this initially
|
||||
; explains the weird vertical stripes on the screen
|
||||
@ -595,7 +595,8 @@ hlin_setup:
|
||||
iny ; 2
|
||||
|
||||
lda gr_offsets,Y ; 4
|
||||
adc DRAW_PAGE ; add in draw page offset ; 3
|
||||
adc #0 ; needed?
|
||||
; adc DRAW_PAGE ; add in draw page offset ; 3
|
||||
sta GBASH ; 3
|
||||
rts ; 6
|
||||
;===========
|
||||
|
||||
Loading…
x
Reference in New Issue
Block a user