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https://github.com/lscharen/iigs-game-engine.git
synced 2025-02-27 21:30:11 +00:00
Added sprite and background disable control bits
This commit is contained in:
Lucas Scharenbroich
parent
cc36fcc0f8
commit
aeb620fb7b
@ -138,6 +138,12 @@ _GTESetAddress MAC
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_GTEUpdateOverlay MAC
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UserTool $2F00+GTEToolNum
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<<<
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_GTEEnableSprites MAC
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UserTool $3000+GTEToolNum
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<<<
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_GTEEnableBackground MAC
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UserTool $3100+GTEToolNum
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<<<
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; EngineMode definitions
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; Script definition
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@ -218,8 +218,9 @@ EngineReset
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stz TileMapHeight
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stz TileMapPtr
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stz TileMapPtr+2
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stz FringeMapPtr
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stz FringeMapPtr+2
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; stz FringeMapPtr
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; stz FringeMapPtr+2
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stz GTEControlBits
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stz BG1TileMapWidth
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stz BG1TileMapHeight
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@ -76,7 +76,8 @@ OldBG1TileOriginY equ 68
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TileMapWidth equ 70 ; Pointer to memory holding the tile map for the primary background
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TileMapHeight equ 72
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TileMapPtr equ 74
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FringeMapPtr equ 78
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; FringeMapPtr equ 78
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GTEControlBits equ 78 ; Enable / disable things
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BG1TileMapWidth equ 82
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BG1TileMapHeight equ 84
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@ -215,6 +216,10 @@ PAD_BUTTON_B equ $0100
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PAD_BUTTON_A equ $0200
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PAD_KEY_DOWN equ $0400
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; GTE Control Bits
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CTRL_SPRITE_DISABLE equ $0001
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CTRL_BKGND_DISABLE equ $0002
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; Tile constants
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TILE_DAMAGED_BIT equ $8000 ; Mark a tile as damaged (internal only)
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TILE_PRIORITY_BIT equ $4000 ; Put tile on top of sprite (unimplemented)
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@ -205,6 +205,10 @@ _RenderNES
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; This is handled by the callback in two phases. We pass pointers to the internal function the callback needs
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; access to. If there is no function defined, do nothing
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lda GTEControlBits
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bit #CTRL_SPRITE_DISABLE
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bne :no_render
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lda ExtSpriteRenderer
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ora ExtSpriteRenderer+2
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beq :no_render
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39
src/Tool.s
39
src/Tool.s
@ -102,6 +102,9 @@ _CallTable
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adrl _TSSetAddress-1
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adrl _TSUpdateOverlay-1
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adrl _TSEnableSprites-1
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adrl _TSEnableBackground-1
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_CTEnd
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_GTEAddSprite MAC
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UserTool $1000+GTEToolNum
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@ -1029,6 +1032,42 @@ _TSCompileSpriteStamp
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_TSExit #0;#4
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; EnableSprites(bool)
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_TSEnableSprites
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:enable equ FirstParam
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_TSEntry
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lda :enable
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beq :turn_off
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lda #CTRL_SPRITE_DISABLE
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trb GTEControlBits
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bra :done
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:turn_off
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lda #CTRL_SPRITE_DISABLE
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tsb GTEControlBits
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:done
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_TSExit #0;#2
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; EnableBackground(bool)
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_TSEnableBackground
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:enable equ FirstParam
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_TSEntry
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lda :enable,s
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beq :turn_off
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lda #CTRL_BKGND_DISABLE
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trb GTEControlBits
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bra :done
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:turn_off
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lda #CTRL_BKGND_DISABLE
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tsb GTEControlBits
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:done
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_TSExit #0;#2
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; Insert the GTE code
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put Math.s
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@ -18,6 +18,14 @@ _BltRange
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bcc *+3
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rts
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; If the background is disabled, jump to a specialized BG routine
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lda GTEControlBits
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bit #CTRL_BKGND_DISABLE
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beq :normal
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brl DisabledBG
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:normal
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phb ; preserve the bank register
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clc`
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@ -63,17 +71,8 @@ _BltRange
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bit #ENGINE_MODE_TWO_LAYER
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beq :skip_bank
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; TODO: Switch to loading the selected BG1 bank. No special "Alt" bank
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;
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; lda RenderFlags
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; bit #RENDER_ALT_BG1
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; beq :primary
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;
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; lda BG1AltBank
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; bra :alt
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;
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;:primary lda BG1DataBank
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;:alt
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; Load the BG1 data bank
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lda BG1DataBank
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pha
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plb
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@ -108,6 +107,76 @@ stk_save lda #0000 ; load the stack
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plb ; restore the bank
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rts
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; Specialize routine that just slams a bunch of PHA instructions when background rendering is disabled
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DisabledBG
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stx tmp15
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tya
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sec
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sbc tmp15
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tay ; Put the count in the y register
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lda ScreenWidth ; Screen width in bytes (0 - 159)
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lsr ; Convert to number of word
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eor #$FFFF
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adc #:blkend ; subtract from the end of the PHA array
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stal :patch+1
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lda #8 ; Enable interrups at least this many lines
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sta tmp14
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txa ; multiply starting line by 2 for indexing
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asl
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tax
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php ; save the current processor flags
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sei ; disable interrupts
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tsc ; save the stack pointer
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sta tmp15
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_R0W1
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:loop
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lda RTable,x ; Load the screen right edge
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tcs
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lda #0
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:patch jmp $0000
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lup 80
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pha
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--^
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:blkend
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dec tmp14
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bmi :enable_int
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:next
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inx
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inx
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dey
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bne :loop
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_R0W0
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lda tmp15
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tcs
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plp
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rts
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:enable_int
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lda #8 ; Reset the counter
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sta tmp14
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lda tmp15 ; restore the stack
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tcs
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sep #$30 ; 8-bit mode
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ldal STATE_REG
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tax ; Save the value
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and #$CF ; Read Bank 0 / Write Bank 0
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stal STATE_REG
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cli
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nop ; Give a couple of cycles
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sei
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txa ; Restore the state
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stal STATE_REG
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rep #$30
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bra :next
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; External entry point. Can be called directly from another bank
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BltRange
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phd
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