mirror of
https://github.com/Pecusx/no_internet.git
synced 2026-05-20 22:33:43 +02:00
369 lines
6.3 KiB
NASM
369 lines
6.3 KiB
NASM
; @com.wudsn.ide.asm.mainsourcefile=ni.asm
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.proc dino ; dino to the screen
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; uses: AXY tmp0 tmp1 tmp2 tmp3
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; Y - ypos in lines
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; X - dino phase (0,1,..)
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_dino = tmp ; _underscore means pointer here and else
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_mask = tmp1 ; local vars for reusing zero page variables
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_scr = tmp2
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_back = tmp3
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sty dino_save_y ;save for clearing
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; get line address offset
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lda scr_addrs_l,y
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sta _scr
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lda scr_addrs_h,y
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sta _scr+1
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; add x position (hardcoded, dino does not move)
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adw _scr #10
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;was: mwa #screen+10+96*sw scr_ ;10 = xpos, 96 == ypos on the screen
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lda dino_tab_l,x
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sta _dino
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lda dino_tab_h,x
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sta _dino+1
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lda dino_mask_tab_l,x
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sta _mask
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lda dino_mask_tab_h,x
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sta _mask+1
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mwa #dino_mask2 _mask
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mwa #dino_back _back
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ldx #24
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loop1
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ldy #0
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dn1
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lda (_scr),y ; get screen contents
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sta (_back),y ; save background for sprite removal
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lda (_mask),y ; mask
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eor #$ff ; inverse, 'cause mads does not inverse OK with '*'
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and (_scr),y ; get screen contents
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ora (_dino),y
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sta (_scr),y
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iny
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cpy #3
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bne dn1
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adw _dino #3
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adw _mask #3
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adw _back #3
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adw _scr #sw
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dex
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bne loop1
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rts
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.endp
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;----------
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.proc dino_clear ; remove old dino
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; uses: AXY tmp2 tmp3
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_scr = tmp2
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_back = tmp3
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ldy dino_save_y ;ypos
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; get line address offset
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lda scr_addrs_l,y
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sta _scr
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lda scr_addrs_h,y
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sta _scr+1
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; add x position (hardcoded, dino does not move)
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adw _scr #10
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;mwa #screen+10+96*sw scr_ ;10 = xpos, 96 == ypos on the screen
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mwa #dino_back _back
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ldx #24
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loop1
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ldy #0
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dn1
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lda (_back),y ; give back background for sprite removal
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sta (_scr),y
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iny
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cpy #3
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bne dn1
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adw _back #3
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adw _scr #sw
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dex
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bne loop1
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rts
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.endp
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;----------
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.proc ground ; ground breaking, i.e. drawing
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; uses: AXY tmp1 tmp2
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; X: x on screen in words (2 bytes)
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; Y: ground tile number (0 - plain ground)
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_gnd = tmp1
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_scr = tmp2
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lda gnd_tab_l,y
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sta _gnd
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lda gnd_tab_h,y
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sta _gnd+1
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mwa #screen+112*sw _scr ;112 is ypos of ground level
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txa
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asl ;add X to xpos on screen
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clc
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adc _scr
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sta _scr
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scc
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inc _scr+1
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ldx #8 ; tile height in bytes
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loop1
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ldy #0
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@
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lda (_gnd),y
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sta (_scr),y
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iny
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cpy #2 ; tile width in bytes
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bne @-
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adw _gnd #2
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adw _scr #sw ;next screen line
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dex
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bne loop1
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; add some debris below
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ldx #6 ; debris height
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loop2
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ldy #1
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@
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lda RANDOM
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:5 AND RANDOM
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sta (_scr),y
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dey
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bpl @-
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adw _scr #sw ;next screen line
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dex
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bpl loop2
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rts
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.endp
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.proc ground_init ;draws first 48 segments of a ground
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mva #0 tmp
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ground_loop
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lda tmp
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tax
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randomize 0 2 3
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tay
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jsr ground
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inc tmp
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lda tmp
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cmp #24 ; screen width in wide mode /2
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bne ground_loop
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rts
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.endp
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;----------
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.proc cactus ; drawing cactii
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; uses: AXY tmp1 tmp2
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; X: x on screen in bytes
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; Y: cactus number
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; draws from bottom up, utilising the fact that .bmp is saved this way
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; updt.: was not able to load .bmp files for unknown reason, so the pics are flipped with WUDSN script
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_cact = tmp1
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_scr = tmp2
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lda cact_tab_l,y
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sta _cact
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lda cact_tab_h,y
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sta _cact+1
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mwa #screen+122*sw _scr ;112 is ypos of bottom of the cactii
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txa
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clc
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adc _scr
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sta _scr
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bcc no_inc
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inc _scr+1
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no_inc
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lda cact_widths,y
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sta cact_w ; width in bytes
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lda cact_heights,y
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tax
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loop
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ldy #0
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@
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lda (_scr),y
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ora (_cact),y
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sta (_scr),y
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iny
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cpy cact_w
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bne @-
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;adw _cact cact_w ;!!!DOES NOT WORK :(((((
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clc
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lda cact_w
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adc _cact
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sta _cact
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scc
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inc _cact+1
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sbw _scr #sw
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dex
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bne loop
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rts
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cact_w .by 0
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.endp
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;----------
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.proc sprites_init
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;setting up P/M graphics
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lda #>pmgraph
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sta pmbase
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lda dmactls
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ora #%00001100 ; Players and Missiles single lined
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sta dmactls
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lda #$03 ; P/M on
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sta pmcntl
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lda #$00
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sta sizem ; there will be only M0, double width
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sta sizep0 ; P0-P3 widths
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sta sizep0+1
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sta sizep0+2
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sta sizep0+3
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lda #$11 ; P/M priorities (bit 4 joins missiles), bit 0 - players on top
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sta gtictls
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/*
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; temporary colours of sprites
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mva #$52 COLPM0
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mva #$34 COLPM1
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mva #$76 COLPM2
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mva #$90 COLPM3
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mva #$B0 COLPF3S
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*/
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dx = 42
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mva #dx HPOSP0
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mva #dx+8 HPOSP1
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MVA #dx+8*2 HPOSP2
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rts
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.endp
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.proc dino_pm
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; uses: AXY tmp tmp1 tmp2 tmp3
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; X: dino animation phase
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; Y: Y position of dino
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_dino = tmp1 ; _underscore means pointer here and else
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_dino_sav = tmp2 ; local vars for reusing zero page variables
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_spr = tmp3
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;tmp = tmp
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mva dino_save_pm_y dino_save_pm_y_prev
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sty dino_save_pm_y ;save for clearing
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lda dino_tab_l,x
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;sta _dino
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sta _dino_sav
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lda dino_tab_h,x
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;sta _dino+1
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sta _dino_sav+1
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mva #0 counter
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loop0
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; sprite address calc
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mwa #(pmgraph+$200) _spr ;1st sprite starts at PMBASE + $200
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;counter *$80
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mwa #-$80 tmp ;so first add gives "0"
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ldy counter
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@
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adw tmp #$80 ;tmp = counter*$80 - calc addr of the sprite to put gfx
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dey
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bpl @-
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adw _spr tmp
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mwa _spr tmp ; save address - it will be used in clearing and then drawing
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lda dino_save_pm_y_prev ;clearing old sprite, same way as drawing a new one
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clc ;add ypos to the sprite address
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adc _spr
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sta _spr
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;scc
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;inc _spr+1 ;not necessary, sprites are not crossing pages
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ldy #0 ;delete old sprite here
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tya
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ldx #24 ;dino height
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@
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sta (_spr),y
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iny
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dex
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bne @-
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;--------------------------
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mwa tmp _spr
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lda dino_save_pm_y ;drawing sprite at a new position
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clc ;add ypos to the sprite address
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adc _spr
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sta _spr
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;scc
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;inc _spr+1 ;not necessary, sprites are not crossing pages
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clc ;beginning of the next column of dino to the sprite
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lda _dino_sav ;0- first column, 1 - 2nd, 2 - 3rd
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adc counter
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sta _dino
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;bcc @+ ;needs to be removed as both bytes must be copied
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lda _dino_sav+1 ;original address
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adc #0
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sta _dino+1
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;@
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ldy #0
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ldx #24 ;dino height
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@
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lda (_dino),y
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sta (_spr),y
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adw _dino #3 ;+3 ==> next line in dino
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adw _spr #1
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dex
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bne @-
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inc:lda counter
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cmp #3
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jne loop0
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rts
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counter .by 0
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dino_save_pm_y .by 0
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dino_save_pm_y_prev .by 0
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.endp
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.proc move_dl ;screen window one byte right
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;uses: AXY
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inc:lda x_scr_offset
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cmp #sw_l
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mwa #dl_addrs+1 incr+1 ;self mod
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ldx #sh
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incr inc $ffff
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adw incr+1 #3
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dex
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bne incr
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rts
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.endp
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x_scr_offset .by 0 ;where is the beginning of the screen
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.proc move_scr ;screen window one step (1/4 th of byte) right
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dec:lda hscr_state
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sta HSCROL
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cmp #4
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bne @+
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mva #12 hscr_state
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sta HSCROL
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jsr move_dl
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jsr move_dl
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@
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rts
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hscr_state .by 0
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.endp |