mirror of
https://github.com/lscharen/iigs-game-engine.git
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Complete Dynamic Tile renderer
This commit is contained in:
Lucas Scharenbroich
parent
76a9710114
commit
4c1dba0f68
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@ -15,7 +15,7 @@
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TSZelda EXT ; tileset buffer
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MAX_SPRITES equ 16
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MAX_SPRITES equ 1
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ScreenX equ 0
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ScreenY equ 2
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@ -24,6 +24,8 @@ Tmp1 equ 6
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KeyState equ 8
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Selected equ 10
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Flips equ 12
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DTile equ 14
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Tmp2 equ 16
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; Typical init
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phk
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@ -95,6 +97,8 @@ HERO_SPRITE equ SPRITE_16X16+1
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; Manually fill in the 41x26 tiles of the TileStore with a test pattern of trees
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; lda #TILE_DYN_BIT+TILE_PRIORITY_BIT+0 ; fill the screen the the dynamic tile slot 0
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lda #TILE_DYN_BIT+0 ; fill the screen the the dynamic tile slot 0
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jsr _fillTileStore
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ldx #0
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@ -145,6 +149,14 @@ HERO_SPRITE equ SPRITE_16X16+1
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ldy #6
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jsr _drawTreeFront
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; Set up the dynamic tile
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lda #65
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sta DTile
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pei DTile
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pea $0000
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_GTECopyTileToDynamic ; Copy DTile into the first dynamic tile slot
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; Initialize the frame counter
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stz FrameCount
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@ -273,9 +285,19 @@ HERO_SPRITE equ SPRITE_16X16+1
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brl :next
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:10 cmp #$0A
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bne :next
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bne :11
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dec ScreenY
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:11 cmp #'y'
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bne :next
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lda DTile
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inc
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and #$007F
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sta DTile
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pha
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pea $0000
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_GTECopyTileToDynamic
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:next
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; inc ScreenX
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@ -283,7 +305,7 @@ HERO_SPRITE equ SPRITE_16X16+1
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pei ScreenY
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_GTESetBG0Origin
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; brl no_animate
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brl no_animate
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stz Tmp0
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stz Tmp1
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@ -433,11 +455,11 @@ GTEStartUp
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brk $02
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:ok2
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clc ; Give GTE a page of direct page memory
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clc ; Give GTE a page of direct page memory
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tdc
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adc #$0100
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pha
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pea $0000 ; No extra capabilities
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pea #ENGINE_MODE_DYN_TILES ; Enable Dynamic Tiles
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lda MyUserId ; Pass the userId for memory allocation
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pha
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_GTEStartUp
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@ -448,15 +470,20 @@ GTEStartUp
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rts
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_fillTileStore
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sta Tmp2
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stz Tmp0
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:oloop
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stz Tmp1
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:iloop
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pei Tmp1
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pei Tmp0
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pea #129
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pei Tmp2
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_GTESetTile
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lda Tmp2
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eor #TILE_PRIORITY_BIT
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sta Tmp2
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lda Tmp1
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inc
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sta Tmp1
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@ -150,7 +150,7 @@ InitTiles
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asl ; of this tile
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asl
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sta TileStore+TS_WORD_OFFSET,x ; This is the offset from 0 to 82, used in LDA (dp),y instruction
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tay
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lda Col2CodeOffset+2,y
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clc
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@ -158,6 +158,11 @@ InitTiles
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; adc TileStore+TS_BASE_ADDR,x
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sta TileStore+TS_CODE_ADDR_LOW,x ; Low word of the tile address in the code field
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lda JTableOffset,y
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clc
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adc :base
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sta TileStore+TS_JMP_ADDR,x ; Address of the snippet handler for this tile
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dec :col
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bpl :hop
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dec :row
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@ -269,7 +274,7 @@ _SetTile
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lda newTileId ; Otherwise chose one of the two dynamic tuples
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and #TILE_PRIORITY_BIT
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beq :pickDynProc ; If the Priority bit is not set, pick the first entry
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lda #1 ; If the Priority bit is set, pick the other one
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lda #1 ; If the Priority bit is set, pick the other one
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:pickDynProc ldy #DynProcs
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jsr _SetTileProcs
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20
src/Tool.s
20
src/Tool.s
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@ -58,6 +58,8 @@ _CallTable
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adrl _TSRemoveSprite-1
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adrl _TSGetSeconds-1
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adrl _TSCopyTileToDynamic-1
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_CTEnd
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_GTEAddSprite MAC
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UserTool $1000+GTEToolNum
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@ -351,6 +353,24 @@ _TSGetSeconds
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_TSExit #0;#0
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_TSCopyTileToDynamic
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:dynId equ FirstParam+0
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:tileId equ FirstParam+2
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_TSEntry
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lda EngineMode
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bit #ENGINE_MODE_DYN_TILES
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beq :notEnabled
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lda :tileId,s
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tax
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lda :dynId,s
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tay
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jsr CopyTileToDyn
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:notEnabled
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_TSExit #0;#4
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; Insert the GTE code
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put Math.s
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@ -351,123 +351,6 @@ ClearTile
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rep #$20
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rts
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; Helper functions to copy tile data to the appropriate location in Bank 0
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; X = tile ID
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; Y = dynamic tile ID
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CopyTileToDyn ENT
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txa
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jsr _GetTileAddr
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tax
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tya
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and #$001F ; Maximum of 32 dynamic tiles
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asl
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asl ; 4 bytes per page
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adc BlitterDP ; Add to the bank 00 base address
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adc #$0100 ; Go to the next page
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tay
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jsr CopyTileDToDyn ; Copy the tile data
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jsr CopyTileMToDyn ; Copy the tile mask
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rtl
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; X = address of tile
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; Y = tile address in bank 0
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CopyTileDToDyn
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phb
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pea $0000
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plb
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plb
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ldal tiledata+0,x
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sta: $0000,y
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ldal tiledata+2,x
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sta: $0002,y
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ldal tiledata+4,x
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sta $0100,y
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ldal tiledata+6,x
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sta $0102,y
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ldal tiledata+8,x
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sta $0200,y
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ldal tiledata+10,x
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sta $0202,y
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ldal tiledata+12,x
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sta $0300,y
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ldal tiledata+14,x
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sta $0302,y
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ldal tiledata+16,x
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sta $0400,y
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ldal tiledata+18,x
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sta $0402,y
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ldal tiledata+20,x
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sta $0500,y
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ldal tiledata+22,x
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sta $0502,y
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ldal tiledata+24,x
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sta $0600,y
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ldal tiledata+26,x
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sta $0602,y
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ldal tiledata+28,x
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sta $0700,y
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ldal tiledata+30,x
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sta $0702,y
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plb
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rts
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; Helper function to copy tile mask to the appropriate location in Bank 0
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;
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; X = address of tile
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; Y = tile address in bank 0
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;
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; Argument are the same as CopyTileDToDyn, the code takes care of adjust offsets.
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; This make is possible to call the two functions back-to-back
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;
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; ldx tileAddr
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; ldy dynTileAddr
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; jsr CopyTileDToDyn
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; jsr CopyTileMToDyn
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CopyTileMToDyn
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phb
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pea $0000
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plb
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plb
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ldal tiledata+32+0,x
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sta: $0080,y
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ldal tiledata+32+2,x
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sta: $0082,y
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ldal tiledata+32+4,x
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sta $0180,y
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ldal tiledata+32+6,x
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sta $0182,y
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ldal tiledata+32+8,x
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sta $0280,y
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ldal tiledata+32+10,x
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sta $0282,y
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ldal tiledata+32+12,x
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sta $0380,y
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ldal tiledata+32+14,x
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sta $0382,y
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ldal tiledata+32+16,x
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sta $0480,y
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ldal tiledata+32+18,x
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sta $0482,y
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ldal tiledata+32+20,x
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sta $0580,y
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ldal tiledata+32+22,x
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sta $0582,y
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ldal tiledata+32+24,x
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sta $0680,y
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ldal tiledata+32+26,x
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sta $0682,y
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ldal tiledata+32+28,x
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sta $0780,y
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ldal tiledata+32+30,x
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sta $0782,y
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plb
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rts
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; CopyBG0Tile
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;
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; A low-level function that copies 8x8 tiles directly into the code field space.
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@ -69,8 +69,8 @@ DynamicOver
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sec
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lda _JTBL_CACHE
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sbc #32 ; All the snippets are 32 bytes wide and, since we're
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sta _JTBL_CACHE ; within one tile, the second column is consecutive
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sbc #SNIPPET_SIZE ; Advance to the next snippet (Reverse indexing)
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sta _JTBL_CACHE
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clc
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lda _OP_CACHE
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@ -95,7 +95,7 @@ DynamicUnder
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lda TileStore+TS_TILE_ID,x ; Get the original tile descriptor
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and #$007F ; clamp to < (32 * 4)
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ora #$B500
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ora #$3580 ; Pre-calc the AND $80,x opcode + operand
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xba
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sta _OP_CACHE ; This is the 2-byte opcode for to load the data
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@ -115,8 +115,8 @@ DynamicUnder
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sec
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lda _JTBL_CACHE
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sbc #32 ; All the snippets are 32 bytes wide and, since we're
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sta _JTBL_CACHE ; within one tile, the second column is consecutive
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sbc #SNIPPET_SIZE
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sta _JTBL_CACHE
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clc
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lda _OP_CACHE
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@ -181,7 +181,7 @@ mixed cmp #$FFFF ; All 1's in the mask is a fully
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lda #$004C ; JMP to handler
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sta: {]2},y
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lda _JTBL_CACHE ; Get the offset to the exception handler for this column
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ora #{]2&$F000} ; adjust for the current row offset
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ora #{]2&$7000} ; adjust for the current row offset
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sta: {]2}+1,y
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tax ; This becomes the new address that we use to patch in
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@ -228,22 +228,138 @@ CopyDynUnder MAC
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; bra *+16
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lda _JTBL_CACHE ; Get the offset to the exception handler for this column
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ora #{]2&$F000} ; adjust for the current row offset
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sta: ]2+1,y
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tay ; This becomes the new address that we use to patch in
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ora #{]2&$7000} ; adjust for the current row offset
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sta: {]2}+1,y
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tax ; This becomes the new address that we use to patch in
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lda #$00A9 ; LDA #DATA
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sta: $0000,y
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ldal tmp_sprite_data+{]1},x
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sta: $0001,y
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sta: $0000,x
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lda tmp_sprite_data+{]1}
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sta: $0001,x
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lda _OP_CACHE
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sta: $0003,y ; AND $80,x
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sta: $0003,x ; AND $80,x
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eor #$8020 ; Switch the opcode to an ORA and remove the high bit of the operand
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sta: $0005,y ; ORA $00,x
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sta: $0005,x ; ORA $00,x
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lda #$0E80 ; branch to the prologue (BRA *+16)
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sta: $0007,y
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sta: $0007,x
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eom
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ldy _Y_REG ; restore original y-register value and move on
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eom
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; Helper functions to move tile data into the dynamic tile space
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; Helper functions to copy tile data to the appropriate location in Bank 0
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; X = tile ID
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; Y = dynamic tile ID
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CopyTileToDyn
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txa
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jsr _GetTileAddr
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tax
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tya
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and #$001F ; Maximum of 32 dynamic tiles
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asl
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asl ; 4 bytes per page
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adc BlitterDP ; Add to the bank 00 base address
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adc #$0100 ; Go to the next page
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tay
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jsr CopyTileDToDyn ; Copy the tile data
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jmp CopyTileMToDyn ; Copy the tile mask
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; X = address of tile
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; Y = tile address in bank 0
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CopyTileDToDyn
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phb
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pea $0000
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plb
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plb
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ldal tiledata+0,x
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sta: $0000,y
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ldal tiledata+2,x
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sta: $0002,y
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ldal tiledata+4,x
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sta $0100,y
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ldal tiledata+6,x
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sta $0102,y
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ldal tiledata+8,x
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sta $0200,y
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ldal tiledata+10,x
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sta $0202,y
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ldal tiledata+12,x
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sta $0300,y
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ldal tiledata+14,x
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sta $0302,y
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ldal tiledata+16,x
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sta $0400,y
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ldal tiledata+18,x
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sta $0402,y
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ldal tiledata+20,x
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sta $0500,y
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ldal tiledata+22,x
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sta $0502,y
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ldal tiledata+24,x
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sta $0600,y
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ldal tiledata+26,x
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sta $0602,y
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ldal tiledata+28,x
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sta $0700,y
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ldal tiledata+30,x
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sta $0702,y
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plb
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rts
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; Helper function to copy tile mask to the appropriate location in Bank 0
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;
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; X = address of tile
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; Y = tile address in bank 0
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;
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; Argument are the same as CopyTileDToDyn, the code takes care of adjust offsets.
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; This make is possible to call the two functions back-to-back
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;
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; ldx tileAddr
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; ldy dynTileAddr
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; jsr CopyTileDToDyn
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; jsr CopyTileMToDyn
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CopyTileMToDyn
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phb
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pea $0000
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plb
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plb
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ldal tiledata+32+0,x
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sta: $0080,y
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ldal tiledata+32+2,x
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sta: $0082,y
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ldal tiledata+32+4,x
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sta $0180,y
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ldal tiledata+32+6,x
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sta $0182,y
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ldal tiledata+32+8,x
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sta $0280,y
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ldal tiledata+32+10,x
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sta $0282,y
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ldal tiledata+32+12,x
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sta $0380,y
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ldal tiledata+32+14,x
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sta $0382,y
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ldal tiledata+32+16,x
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sta $0480,y
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ldal tiledata+32+18,x
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sta $0482,y
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ldal tiledata+32+20,x
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sta $0580,y
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ldal tiledata+32+22,x
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sta $0582,y
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ldal tiledata+32+24,x
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sta $0680,y
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ldal tiledata+32+26,x
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sta $0682,y
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ldal tiledata+32+28,x
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sta $0780,y
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ldal tiledata+32+30,x
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sta $0782,y
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plb
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rts
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@ -34,77 +34,6 @@ ThreeSprites tyx
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FourSprites tyx
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jmp CopyFourSpritesDataAndMaskToDP
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; Simple pair of routines that copies just the tile data to the direct page workspace. Data Bank
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; must be set to the TileData bank in entry.
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;
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; Preserves the X-register
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CopyTileDataToDPA
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]line equ 0
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lup 8
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lda tiledata+{]line*4},y
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sta tmp_tile_data+{]line*4}
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lda tiledata+{]line*4}+2,y
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sta tmp_tile_data+{]line*4}+2
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]line equ ]line+1
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||||
--^
|
||||
rts
|
||||
|
||||
|
||||
; Given a populate tmp_sprite_data buffer to use as a base, merge it with a tile and write to the
|
||||
; code field
|
||||
MergeSpriteWithTileFast
|
||||
ldx TileStore+TS_TILE_ADDR,y
|
||||
lda TileStore+TS_CODE_ADDR_HIGH,y ; load the bank of the target code field line
|
||||
pha ; and put on the stack for later. Has TileStore bank in high byte.
|
||||
lda TileStore+TS_CODE_ADDR_LOW,y ; load the address of the code field
|
||||
tay
|
||||
plb
|
||||
|
||||
]line equ 0
|
||||
lup 8
|
||||
lda tmp_sprite_data+{]line*4}
|
||||
andl tiledata+{]line*4}+32,x
|
||||
oral tiledata+{]line*4},x
|
||||
sta: $0004+{]line*$1000},y
|
||||
|
||||
lda tmp_sprite_data+{]line*4}+2
|
||||
andl tiledata+{]line*4}+32+2,x
|
||||
oral tiledata+{]line*4}+2,x
|
||||
sta: $0001+{]line*$1000},y
|
||||
]line equ ]line+1
|
||||
--^
|
||||
plb
|
||||
rts
|
||||
|
||||
MergeSpriteWithTileSlow
|
||||
ldx TileStore+TS_TILE_ADDR,y
|
||||
lda TileStore+TS_CODE_ADDR_HIGH,y ; load the bank of the target code field line
|
||||
pha ; and put on the stack for later. Has TileStore bank in high byte.
|
||||
lda TileStore+TS_CODE_ADDR_LOW,y ; load the address of the code field
|
||||
tay
|
||||
plb
|
||||
|
||||
]line equ 0
|
||||
lup 8
|
||||
lda tmp_sprite_data+{]line*4}
|
||||
andl tiledata+{]line*4}+32,x
|
||||
oral tiledata+{]line*4},x
|
||||
sta: $0004+{]line*$1000},y
|
||||
|
||||
lda tmp_sprite_data+{]line*4}+2
|
||||
andl tiledata+{]line*4}+32+2,x
|
||||
oral tiledata+{]line*4}+2,x
|
||||
sta: $0001+{]line*$1000},y
|
||||
]line equ ]line+1
|
||||
--^
|
||||
jmp _FillPEAOpcode
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
; Now, implement the generic Two, Three and Four sprite routines for both Over and Under rendering. These
|
||||
; are fairly involved, so we try to only have a single implementation of them for now without excessve
|
||||
; specialization.
|
||||
|
|
|
|||
|
|
@ -156,7 +156,8 @@ OneSpriteSlowUnderV
|
|||
; Dynamic tiles with one sprite.
|
||||
|
||||
OneSpriteDynamicUnder
|
||||
ldx sprite_ptr0
|
||||
txy
|
||||
tax
|
||||
]line equ 0
|
||||
lup 8
|
||||
ldal spritedata+{]line*SPRITE_PLANE_SPAN},x
|
||||
|
|
@ -165,10 +166,12 @@ OneSpriteDynamicUnder
|
|||
sta tmp_sprite_data+{]line*4}+2
|
||||
]line equ ]line+1
|
||||
--^
|
||||
tyx
|
||||
jmp DynamicUnder
|
||||
|
||||
OneSpriteDynamicOver
|
||||
ldx sprite_ptr0
|
||||
txy
|
||||
tax
|
||||
]line equ 0
|
||||
lup 8
|
||||
ldal spritedata+{]line*SPRITE_PLANE_SPAN},x
|
||||
|
|
@ -178,9 +181,10 @@ OneSpriteDynamicOver
|
|||
|
||||
ldal spritemask+{]line*SPRITE_PLANE_SPAN},x
|
||||
sta tmp_sprite_mask+{]line*4}
|
||||
ldal spritedata+{]line*SPRITE_PLANE_SPAN}+2,x
|
||||
ldal spritemask+{]line*SPRITE_PLANE_SPAN}+2,x
|
||||
sta tmp_sprite_mask+{]line*4}+2
|
||||
]line equ ]line+1
|
||||
--^
|
||||
tyx
|
||||
jmp DynamicOver
|
||||
|
||||
|
|
|
|||
Loading…
Reference in New Issue
Block a user