146 lines
2.4 KiB
ArmAsm
146 lines
2.4 KiB
ArmAsm
;
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; crosshair
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; Code and data structures related to the aiming crosshair
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;
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; Created by Quinn Dunki on 2/13/21
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;
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crosshairGameObject:
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.word 100 ; X pos in pixels (from right terrain edge)
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.word 100 ; Y pos in pixels (from bottom terrain edge)
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.word 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 ; Saved background 128 bytes
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.word 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
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.word 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
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.word 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
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crosshairBackgroundStale:
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.word 0
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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; updateCrosshair
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;
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; Y = Player index to update for
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; Trashes SCRATCHL, PARAML0, PARAML1
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;
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updateCrosshair:
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SAVE_AXY
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PLAYERPTR_Y
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; Calculate X offset
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lda playerData+PD_ANGLE,y
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asl
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tax
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lda pixelCircle45X,x
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bmi updateCrosshairNegX
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; Compute screenspace X
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sta SCRATCHL
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clc
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lda playerData+GO_POSX,y
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adc SCRATCHL
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sta crosshairGameObject+GO_POSX
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bra updateCrosshairCalcY
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updateCrosshairNegX:
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eor #$FFFF
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inc
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; Compute screenspace X
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sta SCRATCHL
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sec
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lda playerData+GO_POSX,y
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sbc SCRATCHL
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sta crosshairGameObject+GO_POSX
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updateCrosshairCalcY:
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; Calculate Y offset
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lda playerData+PD_ANGLE,y
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asl
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tax
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lda pixelCircle45Y,x
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sta SCRATCHL
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; Compute screenspace Y
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clc
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lda playerData+GO_POSY,y
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adc SCRATCHL
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sta crosshairGameObject+GO_POSY
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updateCrosshairDone:
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RESTORE_AXY
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rts
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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; renderCrosshair
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;
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; Y = Player index to render for
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; Trashes Y,PARAML0,SCRATCHL
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;
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renderCrosshair:
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pha
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PLAYERPTR_Y
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lda #crosshairGameObject
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sta PARAML0
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lda playerData+PD_POWER,y ; Choose reticle size for power level
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sta SCRATCHL
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lda #14
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clc
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adc SCRATCHL
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jsr renderGameObject
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renderCrosshairDone:
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pla
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rts
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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; protectCrosshair
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;
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; Trashes PARAML0
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;
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protectCrosshair:
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pha
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lda #crosshairGameObject
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sta PARAML0
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jsr vramPtr
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cpx #$ffff
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beq protectCrosshairDone
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lda #crosshairGameObject+GO_BACKGROUND
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sta PARAML0
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jsr protectGameObject
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stz crosshairBackgroundStale
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protectCrosshairDone:
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pla
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rts
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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; unrenderCrosshair
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;
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; Trashes PARAML0
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;
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unrenderCrosshair:
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pha
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lda crosshairBackgroundStale
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bne unrenderCrosshairDone
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lda #crosshairGameObject
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sta PARAML0
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jsr unrenderGameObject
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unrenderCrosshairDone:
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pla
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rts
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