686 lines
16 KiB
ArmAsm
686 lines
16 KiB
ArmAsm
;===========================
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; Draw the Mode7 Background
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;===========================
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; opening screen, original code
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; $2d070 cycles = 184,432 = 5.4 fps
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; $2da70 cycles (added in 2 cycle cpx) a00 = 2560, yes, 32*40=1280
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; $2aec3 cycles (update inner loop) = 175,811 = 5.7 fps
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; $29af5 cycles (move things around) = 170,741 = 5.85 fps
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; $29988 cycles (save another cycle) = 170,393 = 5.86 fps
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; $29968 cycles (align lookup tables)
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; $28FA8 cycles (remove clc) = 167,848 = 5.95 fps
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; TODO:
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; could save cycle running inner X loop backwards, but would
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; have to redo a lot of the math to start at right of screen
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; could save avg of 2 cycles on inner X loop if we have special
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; case odd vs even lines
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; flying_loop -> check_done 2040 - 214f 2E
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;
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; check_done -> draw_background 214f - 219b 2E
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;
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; draw_background -> check_over_water 219b - 219e 298ad
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;
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; check_over_water -> no_splash 219e - 21d0 5b
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;
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; no_splash -> done_flying_loop 21d0 - 229b aa4
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draw_background_mode7:
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; setup initial odd/even color mask
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lda #$f0 ; 2
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sta COLOR_MASK ; 3
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; start Y at 8 (below horizon line)
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lda #8 ; 2
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sta SCREEN_Y ; 3
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;=============
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; 10
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screeny_loop:
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and #$fe ; be sure SCREEN_Y used later is even ; 2
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tay ; put in Y for lookup table later ; 2
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lda COLOR_MASK ; flip mask for odd/even row plotting ; 3
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eor #$ff ; 2
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sta COLOR_MASK ; 3
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sta mask_label+1 ; setup self-modifying code ; 4
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bpl odd_branch ; smc for even/odd line ; 2nt/3
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lda #$1d ; ora abs,X opcode is $1d ; 2
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bne ok_branch ; bra ; 3
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odd_branch:
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lda #$2c ; bit is $2c ; 2
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ok_branch:
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sta innersmc1 ; actually update ora/bit ; 4
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;============
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; ?27
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setup_gr_addr:
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lda gr_offsets,Y ; lookup low-res memory row address ; 4
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sta innersmc1+1 ; smc low addr ; 4
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sta innersmc2+1 ; smc low addr ; 4
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lda gr_offsets+1,Y ; load high part of address ; 4
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clc ; clear carry for add ; 2
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adc DRAW_PAGE ; add in draw page offset ; 3
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sta innersmc1+2 ; smc high addr ; 4
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sta innersmc2+2 ; smc high addr ; 4
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;=============
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; 29
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calc_horizontal_scale:
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; Calculate the horizontal scale using a lookup table
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; horizontal_scale.i *ALWAYS* = 0
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; unsigned char horizontal_lookup[7][32];
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;horizontal_scale.f=
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; horizontal_lookup[space_z.i&0xf][(screen_y-8)/2];
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; horizontal_lookup[(space_z<<5)+(screen_y-8)]
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clc ; 2
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lda SCREEN_Y ; 3
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spacez_shifted:
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adc #0 ; self-modify, loads (spacez<<5)-8 ; 2
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tay ; 2
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lda horizontal_lookup,Y ; 4
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sta NUM1L ; HORIZ_SCALE_F is input to next mul ; 3
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;============
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; 16
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; mul2
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; calculate the distance of the line we are drawing
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; fixed_mul(&horizontal_scale,&scale,&distance);
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lda #0 ; HORIZ_SCALE_I is always zero ; 2
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sta NUM1H ; 3
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; NUM1L was set to HORIZ_SCALE_F previously ;
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lda #CONST_SCALE_I ; SCALE_I ; 2
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sta NUM2H ; 3
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lda #CONST_SCALE_F ; SCALE_F ; 2
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sta NUM2L ; 3
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sec ; don't reuse previous settings ; 2
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jsr multiply ; 6
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stx DISTANCE_I ; 2
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sta DISTANCE_F ; 2
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;==========
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; 27
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; calculate the dx and dy to add to points in space
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; we add to the starting values on each row to get the next
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; space values
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; dx.i=fixed_sin[(angle+8)&0xf].i // -sin()
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lda ANGLE ; 3
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clc ; 2
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adc #8 ; 2
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and #$f ; 2
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asl ; 2
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tay ; 2
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lda fixed_sin,Y ; load integer half ; 4
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sta NUM2H ; use as source in upcomnig mul ; 3
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; dx.f=fixed_sin[(angle+8)&0xf].f; // -sin()
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iny ; point to float half ; 2
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lda fixed_sin,Y ; load it from lookup table ; 4
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sta NUM2L ; use as source in upcoming mul ; 3
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;==========
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; 29
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;mul3
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; fixed_mul(&dx,&horizontal_scale,&dx);
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; DX_I:DX_F already set in NUM2H:NUM2L
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clc ; reuse HORIZ_SCALE in NUM1 ; 2
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jsr multiply ; 6
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stx DX_I ; 3
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sta DX_F ; 3
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;==========
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; 14
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; dy.i=fixed_sin[(angle+4)&0xf].i; // cos()
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lda ANGLE ; 3
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clc ; 2
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adc #4 ; 2
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and #$f ; 2
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asl ; 2
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tay ; 2
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lda fixed_sin,Y ; load integer half ; 4
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sta NUM2H ; use as source in upcoming mul ; 3
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; dy.f=fixed_sin[(angle+4)&0xf].f; // cos()
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iny ; point to float half ; 2
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lda fixed_sin,Y ; load from lookup table ; 4
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sta NUM2L ; use as source in upcoming mul ; 3
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;==========
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; 29
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;mul4
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; fixed_mul(&dy,&horizontal_scale,&dy);
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; DY_I:DY_F already in NUM2H:NUM2L
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clc ; reuse horiz_scale in num1 ; 2
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jsr multiply ; 6
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stx DY_I ; 3
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sta DY_F ; 3
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;==========
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; 14
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;=================================
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; calculate the starting position
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;=================================
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; fixed_add(&distance,&factor,&space_x);
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clc ; fixed_add(&distance,&factor,&space_y); ; 2
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lda DISTANCE_F ; 3
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adc FACTOR_F ; 3
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sta SPACEY_F ; 3
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sta SPACEX_F ; 3
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lda DISTANCE_I ; 3
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adc FACTOR_I ; 3
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sta SPACEY_I ; 3
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sta SPACEX_I ; 3
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;==========
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; 26
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; temp.i=fixed_sin[(angle+4)&0xf].i; // cos()
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lda ANGLE ; 3
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clc ; 2
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adc #4 ; 2
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and #$f ; 2
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asl ; 2
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tay ; 2
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lda fixed_sin,Y ; 4
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sta NUM2H ; store as source for next mul ; 3
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; temp.f=fixed_sin[(angle+4)&0xf].f; // cos()
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iny ; 2
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lda fixed_sin,Y ; 4
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sta NUM2L ; store as source for next mul ; 3
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;==========
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; 29
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; mul5
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; fixed_mul(&space_x,&temp,&space_x);
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lda SPACEX_I ; 3
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sta NUM1H ; 3
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lda SPACEX_F ; 3
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sta NUM1L ; 3
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; NUM2H:NUM2L already set above
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sec ; don't reuse previous NUM1 ; 2
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jsr multiply ; 6
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; SPACEX_I in X ;
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; SPACEX_F in A ;
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;==========
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; 20
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; fixed_add(&space_x,&cx,&space_x);
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clc ; 2
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; SPACEX_F still in A ;
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adc CX_F ; 3
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sta SPACEX_F ; 3
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txa ; SPACEX_I was in X ; 2
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adc CX_I ; 3
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sta SPACEX_I ; 3
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;===========
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; 16
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; temp.i=fixed_sin[angle&0xf].i; // sin()
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lda ANGLE ; 3
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and #$f ; 2
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asl ; 2
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tay ; 2
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lda fixed_sin,Y ; 4
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sta NUM2H ; store for next mul ; 3
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; fixed_temp.f=fixed_sin[angle&0xf].f; // sin()
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iny ; 2
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lda fixed_sin,Y ; 4
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sta NUM2L ; store for next mul ; 3
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;==========
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; 25
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;mul6
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; fixed_mul(&space_y,&fixed_temp,&space_y);
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lda SPACEY_I ; 3
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sta NUM1H ; 3
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lda SPACEY_F ; 3
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sta NUM1L ; 3
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; NUM2H:NUM2L already set
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sec ; don't reuse previous num1 ; 2
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jsr multiply ; 6
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; SPACEY_I in X ;
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; SPACEY_F in A ;
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;==========
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; 20
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; fixed_add(&space_y,&cy,&space_y);
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clc ; 2
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; SPACEY_F in A
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adc CY_F ; 3
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sta SPACEY_F ; 3
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txa ; SPACEY_I in X ; 2
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adc CY_I ; 3
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sta SPACEY_I ; 3
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;==========
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; 16
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; mul7
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; fixed_mul(&lowres_half,&dx,&temp);
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lda #CONST_LOWRES_HALF_I ; 2
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sta NUM1H ; 3
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lda #CONST_LOWRES_HALF_F ; 2
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sta NUM1L ; 3
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lda DX_I ; 3
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sta NUM2H ; 3
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sta dxi_label+1 ; for self modify ; 4
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lda DX_F ; 3
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sta dxf_label+1 ; for self modify ; 4
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sta NUM2L ; 3
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sec ; don't reuse previous num1 ; 2
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jsr multiply ; 6
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; TEMP_I in X ;
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; TEMP_F in A ;
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;==========
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; 38
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; fixed_add(&space_x,&temp,&space_x);
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clc ; 2
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; TEMP_F in A
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adc SPACEX_F ; 3
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sta SPACEX_F ; 3
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txa ; TEMP_I in X ; 2
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adc SPACEX_I ; 3
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sta SPACEX_I ; 3
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;==========
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; 16
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;mul8
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; fixed_mul(&fixed_temp,&dy,&fixed_temp);
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lda DY_I ; 3
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sta NUM2H ; 3
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sta dyi_label+1 ; for self modify ; 4
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lda DY_F ; 3
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sta NUM2L ; 3
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sta dyf_label+1 ; for self modify ; 4
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clc ; reuse CONST_LOWRES_HALF from last time ; 2
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jsr multiply ; 6
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; TEMP_I in X
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; TEMP_F in A
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;==========
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; 28
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; fixed_add(&space_y,&temp,&space_y);
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clc ; 2
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; TEMP_F in A
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adc SPACEY_F ; 3
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sta SPACEY_F ; 3
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txa ; TEMP_I in X ; 2
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adc SPACEY_I ; 3
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sta SPACEY_I ; 3
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;==========
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; 16
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ldx #0 ; was SCREEN_X ; 2
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;==========
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; 2
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;===================================================
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; SCREEN_X LOOP!!!!
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; every cycle in here counts for 32*40=1280 cycles
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;===================================================
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screenx_loop:
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nomatch:
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;====================================
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; do a full lookup, takes much longer
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; used to be a separate function but we inlined it here
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;====================
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; lookup_map
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;====================
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; finds value in space_x.i,space_y.i
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; returns color in A
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; CLOBBERS: A,Y
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; island is 8x8
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; map is 64x64 but anything not island is ocean
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lda SPACEX_I ; 3
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sta spacex_label+1 ; self modifying code, LAST_SPACEX_I ; 4
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and #CONST_MAP_MASK_X ; wrap at 64 ; 2
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sta SPACEX_I ; store i patch out ; 3
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tay ; copy to Y for later ; 2
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lda SPACEY_I ; 3
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sta spacey_label+1 ; self modifying code, LAST_SPACEY_I ; 4
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and #CONST_MAP_MASK_Y ; wrap to 64x64 grid ; 2
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sta SPACEY_I ; 3
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asl ; 2
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asl ; 2
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asl ; multiply by 8 ; 2
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clc ; 2
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adc SPACEX_I ; add in X value ; 3
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; only valid if x<8 and y<8
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;============
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; 37
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; SPACEX_I is n y
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cpy #$8 ; 2
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bcs ocean_color ; bge 8 ; 2nt/3
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ldy SPACEY_I ; 3
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cpy #$8 ; 2
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bcs ocean_color ; bge 8 ; 2nt/3
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;=============
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; ??
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;==============
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; lookup island
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; A is spacey<<3+spacex
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island_color:
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tay ; 2
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lda flying_map,Y ; load from array ; 4
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jmp update_cache ; 3
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;============
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; 11
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;=============
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; lookup ocean
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; A is spacey<<3+spacex
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ocean_color:
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and #$1f ; 2
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tay ; 2
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lda water_map,Y ; the color of the sea ; 4
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;===========
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; 8
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; store cached value
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; note: this does seem faster than storing in zero page
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update_cache:
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sta map_color_label+1 ; self-modifying ; 4
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;===========
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; 4
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match:
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mask_label:
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; color is in A
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; this is f0 or 0f depending on odd/even row
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and #0 ; COLOR_MASK (self modifying) ; 2
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; this is ora or bit depending on odd/even
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innersmc1:
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ora $400,X ; we're odd, or the bottom in ; 4
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innersmc2:
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sta $400,X ; plot double height pixel ; 5
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;============
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; 11
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;===================================
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; incremement column, see if done
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inx ; increment SCREEN_X ; 2
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cpx #40 ; 2
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beq done_screenx_loop ; branch until we've done 40 ; 2nt/3
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;=============
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; 6/7
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;=======================================
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; advance to the next position in space
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; fixed_add(&space_x,&dx,&space_x);
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; state of carry here? cpx #40 should always be less than so cc?
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; clc ; 2
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lda SPACEX_F ; 3
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dxf_label:
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adc #0 ; self modifying, is DX_F ; 2
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sta SPACEX_F ; 3
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lda SPACEX_I ; 3
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dxi_label:
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adc #0 ; self modifying, is DX_I ; 2
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sta SPACEX_I ; 3
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tay ; save for later ; 2
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;==========
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; 20
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; fixed_add(&space_y,&dy,&space_y);
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clc ; 2
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lda SPACEY_F ; 3
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dyf_label:
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adc #0 ; self modifyig, is DY_F ; 2
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sta SPACEY_F ; 3
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lda SPACEY_I ; 3
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dyi_label:
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adc #0 ; self mofidying is DY_I ; 2
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sta SPACEY_I ; 3
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;============
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; 18
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; cache color and return if same as last time
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; SPACEY_I is in A from above
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spacey_label:
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cmp #0 ; self modify, LAST_SPACEY_I ; 2
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bne nomatch ; 2nt/3
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; SPACEX_I is in Y
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spacex_label:
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cpy #0 ; self modify, LAST_SPACEX_I ; 2
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bne nomatch ; 2nt/3
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map_color_label:
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lda #0 ; self modify, LAST_MAP_COLOR ; 2
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jmp match ; 3
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;============
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; ??
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;========================
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; get here at end of loop
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;=========================
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done_screenx_loop:
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inc SCREEN_Y ; 5
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lda SCREEN_Y ; 3
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cmp #40 ; LOWRES height ; 2
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beq done_screeny ; 2nt/3
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jmp screeny_loop ; too far to branch ; 3
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;=============
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; 15
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done_screeny:
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rts ; 6
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;====================
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; lookup_map
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;====================
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; finds value in space_x.i,space_y.i
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; returns color in A
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; CLOBBERS: A,Y
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; this is used to check if above water or grass
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; the high-performance per-pixel version has been inlined
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lookup_map:
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lda SPACEX_I ; 3
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and #CONST_MAP_MASK_X ; 2
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sta SPACEX_I ; 3
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tay ; 2
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lda SPACEY_I ; 3
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and #CONST_MAP_MASK_Y ; wrap to 64x64 grid ; 2
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sta SPACEY_I ; 3
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asl ; 2
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asl ; 2
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asl ; multiply by 8 ; 2
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clc ; 2
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adc SPACEX_I ; add in X value ; 3
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; only valid if x<8 and y<8
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; SPACEX_I is in y
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cpy #$8 ; 2
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;============
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; 31
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bcs ocean_color_outline ; bgt 8 ;^2nt/3
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ldy SPACEY_I ; 3
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cpy #$8 ; 2
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bcs ocean_color_outline ; bgt 8 ; 2nt/3
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tay ; 2
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lda flying_map,Y ; load from array ; 4
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bcc update_cache_outline ; 3
|
|
|
|
ocean_color_outline:
|
|
and #$1f ; 2
|
|
tay ; 2
|
|
lda water_map,Y ; the color of the sea ; 4
|
|
|
|
update_cache_outline:
|
|
rts ; 6
|
|
|
|
|
|
|
|
;======================================
|
|
; draw sky
|
|
;======================================
|
|
; Only draw sky if necessary
|
|
; (at start, or if we have switched to text, we never overwrite it)
|
|
draw_sky:
|
|
; 6
|
|
; Draw Sky on both pages
|
|
; lines 0..6
|
|
|
|
|
|
lda #COLOR_BOTH_MEDIUMBLUE ; MEDIUMBLUE color ; 2
|
|
ldx #39
|
|
|
|
sky_loop: ; draw line across screen
|
|
sta $400,X
|
|
sta $480,X
|
|
sta $500,X
|
|
sta $800,X
|
|
sta $880,X
|
|
sta $900,X
|
|
|
|
dex
|
|
bpl sky_loop
|
|
|
|
; Draw Hazy Horizon
|
|
|
|
lda #$56 ; Horizon is blue/grey ; 2
|
|
ldx #39
|
|
horizon_loop: ; draw line across screen
|
|
sta $580,X
|
|
sta $980,X
|
|
|
|
dex
|
|
bpl horizon_loop
|
|
|
|
rts
|
|
|
|
|
|
|
|
;horizontal_lookup_20:
|
|
; .byte $0C,$0A,$09,$08,$07,$06,$05,$05,$04,$04,$04,$04,$03,$03,$03,$03
|
|
; .byte $26,$20,$1B,$18,$15,$13,$11,$10,$0E,$0D,$0C,$0C,$0B,$0A,$0A,$09
|
|
; .byte $40,$35,$2D,$28,$23,$20,$1D,$1A,$18,$16,$15,$14,$12,$11,$10,$10
|
|
; .byte $59,$4A,$40,$38,$31,$2C,$28,$25,$22,$20,$1D,$1C,$1A,$18,$17,$16
|
|
; .byte $73,$60,$52,$48,$40,$39,$34,$30,$2C,$29,$26,$24,$21,$20,$1E,$1C
|
|
; .byte $8C,$75,$64,$58,$4E,$46,$40,$3A,$36,$32,$2E,$2C,$29,$27,$25,$23
|
|
; .byte $A6,$8A,$76,$68,$5C,$53,$4B,$45,$40,$3B,$37,$34,$30,$2E,$2B,$29
|
|
|
|
; we can guarantee 4 cycle indexed reads if we page-align this
|
|
; it's 16*14 bytes
|
|
.align 256
|
|
horizontal_lookup:
|
|
.byte $0C,$0B,$0A,$09,$09,$08,$08,$07,$07,$06,$06,$06,$05,$05,$05,$05
|
|
.byte $04,$04,$04,$04,$04,$04,$04,$03,$03,$03,$03,$03,$03,$03,$03,$03
|
|
.byte $26,$22,$20,$1D,$1B,$19,$18,$16,$15,$14,$13,$12,$11,$10,$10,$0F
|
|
.byte $0E,$0E,$0D,$0D,$0C,$0C,$0C,$0B,$0B,$0A,$0A,$0A,$0A,$09,$09,$09
|
|
.byte $40,$3A,$35,$31,$2D,$2A,$28,$25,$23,$21,$20,$1E,$1D,$1B,$1A,$19
|
|
.byte $18,$17,$16,$16,$15,$14,$14,$13,$12,$12,$11,$11,$10,$10,$10,$0F
|
|
.byte $59,$51,$4A,$44,$40,$3B,$38,$34,$31,$2F,$2C,$2A,$28,$26,$25,$23
|
|
.byte $22,$21,$20,$1E,$1D,$1C,$1C,$1B,$1A,$19,$18,$18,$17,$16,$16,$15
|
|
.byte $73,$68,$60,$58,$52,$4C,$48,$43,$40,$3C,$39,$36,$34,$32,$30,$2E
|
|
.byte $2C,$2A,$29,$27,$26,$25,$24,$22,$21,$20,$20,$1F,$1E,$1D,$1C,$1C
|
|
.byte $8C,$80,$75,$6C,$64,$5D,$58,$52,$4E,$4A,$46,$43,$40,$3D,$3A,$38
|
|
.byte $36,$34,$32,$30,$2E,$2D,$2C,$2A,$29,$28,$27,$26,$25,$24,$23,$22
|
|
.byte $A6,$97,$8A,$80,$76,$6E,$68,$61,$5C,$57,$53,$4F,$4B,$48,$45,$42
|
|
.byte $40,$3D,$3B,$39,$37,$35,$34,$32,$30,$2F,$2E,$2C,$2B,$2A,$29,$28
|
|
|
|
; 8.8 fixed point
|
|
; should we store as two arrays, one I one F?
|
|
; 32 bytes
|
|
fixed_sin:
|
|
.byte $00,$00 ; 0.000000=00.00
|
|
.byte $00,$61 ; 0.382683=00.61
|
|
.byte $00,$b5 ; 0.707107=00.b5
|
|
.byte $00,$ec ; 0.923880=00.ec
|
|
.byte $01,$00 ; 1.000000=01.00
|
|
.byte $00,$ec ; 0.923880=00.ec
|
|
.byte $00,$b5 ; 0.707107=00.b5
|
|
.byte $00,$61 ; 0.382683=00.61
|
|
.byte $00,$00 ; 0.000000=00.00
|
|
.byte $ff,$9f ; -0.382683=ff.9f
|
|
.byte $ff,$4b ; -0.707107=ff.4b
|
|
.byte $ff,$14 ; -0.923880=ff.14
|
|
.byte $ff,$00 ; -1.000000=ff.00
|
|
.byte $ff,$14 ; -0.923880=ff.14
|
|
.byte $ff,$4b ; -0.707107=ff.4b
|
|
.byte $ff,$9f ; -0.382683=ff.9f
|
|
|
|
; 32 bytes
|
|
fixed_sin_scale:
|
|
.byte $00,$00
|
|
.byte $00,$0c
|
|
.byte $00,$16
|
|
.byte $00,$1d
|
|
.byte $00,$20
|
|
.byte $00,$1d
|
|
.byte $00,$16
|
|
.byte $00,$0c
|
|
.byte $00,$00
|
|
.byte $ff,$f4
|
|
.byte $ff,$ea
|
|
.byte $ff,$e3
|
|
.byte $ff,$e0
|
|
.byte $ff,$e3
|
|
.byte $ff,$ea
|
|
.byte $ff,$f4
|