mirror of
https://github.com/jeremysrand/BuGS.git
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85 lines
1.3 KiB
ArmAsm
85 lines
1.3 KiB
ArmAsm
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; gameShot.s
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; BuGS
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;
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; Created by Jeremy Rand on 2020-11-15.
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;Copyright © 2020 Jeremy Rand. All rights reserved.
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;
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case on
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mcopy gameShot.macros
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keep gameShot
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gameShot start
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using globalData
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using tileData
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using screenData
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SHOT_STATE_NONE equ 0
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SHOT_STATE_START_SHOOTING equ 1
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SHOT_STATE_SHOOTING equ 2
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shotInitLevel entry
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stz shotState
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rtl
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maybeShoot entry
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lda shotState
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bne maybeShoot_alreadyShooting
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lda #SHOT_STATE_START_SHOOTING
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sta shotState
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maybeShoot_alreadyShooting anop
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rtl
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updateShot entry
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lda playerState
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cmp #PLAYER_STATE_ONSCREEN
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beq updateShot_playerOnscreen
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rtl
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updateShot_playerOnscreen anop
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lda shotState
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bne updateShot_notNone
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lda mouseX
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and #1
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bne updateShot_shifted
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lda mouseAddress
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sec
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sbc #$1df
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tay
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sec
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sbc #SCREEN_ADDRESS
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and #$fffc
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tax
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lda >screenToTileOffset,x
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tax
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lda #TILE_STATE_DIRTY
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sta tileDirty,x
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jmp >drawHalfShot
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updateShot_shifted anop
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lda mouseAddress
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sec
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sbc #$1de
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tay
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sec
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sbc #SCREEN_ADDRESS
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and #$fffc
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tax
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lda >screenToTileOffset,x
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tax
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lda #TILE_STATE_DIRTY
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sta tileDirty,x
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jmp >drawHalfShotShift
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updateShot_notNone anop
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rtl
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shotState dc i2'SHOT_STATE_NONE'
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shotShifted dc i2'0'
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shotAddress dc i2'0'
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end
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