mirror of
https://github.com/lscharen/iigs-game-engine.git
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Start to split the tiles into high-level and low-level code
This commit is contained in:
Lucas Scharenbroich
parent
5745482ef6
commit
e5da3991cd
124
src/Tiles.s
Normal file
124
src/Tiles.s
Normal file
@ -0,0 +1,124 @@
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; Basic tile functions
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; Low-level function to take a tile descriptor and return the address in the tiledata
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; bank. This is not too useful in the fast-path because the fast-path does more
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; incremental calculations, but it is handy for other utility functions
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;
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; A = tile descriptor
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;
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; The address is the TileID * 128 + (HFLIP * 64)
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GetTileAddr ENT
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jsr _GetTileAddr
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rtl
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_GetTileAddr
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asl ; Multiply by 2
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bit #2*TILE_HFLIP_BIT ; Check if the horizontal flip bit is set
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beq :no_flip
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inc ; Set the LSB
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:no_flip asl ; x4
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asl ; x8
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asl ; x16
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asl ; x32
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asl ; x64
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asl ; x128
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rts
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; Ignore the horizontal flip bit
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_GetBaseTileAddr
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asl ; Multiply by 2
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asl ; x4
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asl ; x8
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asl ; x16
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asl ; x32
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asl ; x64
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asl ; x128
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rts
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; Initialize the tile storage data structures. This takes care of populating the tile records with the
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; appropriate constant values.
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InitTiles
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:col equ tmp0
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:row equ tmp1
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:vbuff equ tmp2
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; Fill in the TileStoreYTable. This is just a table of offsets into the Tile Store for each row. There
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; are 26 rows with a stride of 41
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ldy #0
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lda #0
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:yloop
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sta TileStoreYTable,y
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clc
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adc #41*2
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iny
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iny
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cpy #26*2
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bcc :yloop
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; Next, initialize the Tile Store itself
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ldx #TILE_STORE_SIZE-2
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lda #25
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sta :row
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lda #40
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sta :col
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lda #$8000
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sta :vbuff
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:loop
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; The first set of values in the Tile Store are changed during each frame based on the actions
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; that are happening
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lda #0
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stal TileStore+TS_TILE_ID,x ; clear the tile store with the special zero tile
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stal TileStore+TS_TILE_ADDR,x
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stal TileStore+TS_SPRITE_FLAG,x ; no sprites are set at the beginning
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stal TileStore+TS_DIRTY,x ; none of the tiles are dirty
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; lda DirtyTileProcs ; Fill in with the first dispatch address
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; stal TileStore+TS_DIRTY_TILE_DISP,x
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;
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; lda TileProcs ; Same for non-dirty, non-sprite base case
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; stal TileStore+TS_BASE_TILE_DISP,x
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lda :vbuff ; array of sprite vbuff addresses per tile
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stal TileStore+TS_VBUFF_ARRAY_ADDR,x
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clc
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adc #32
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sta :vbuff
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; The next set of values are constants that are simply used as cached parameters to avoid needing to
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; calculate any of these values during tile rendering
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lda :row ; Set the long address of where this tile
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asl ; exists in the code fields
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tay
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lda BRowTableHigh,y
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stal TileStore+TS_CODE_ADDR_HIGH,x ; High word of the tile address (just the bank)
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lda BRowTableLow,y
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stal TileStore+TS_BASE_ADDR,x ; May not be needed later if we can figure out the right constant...
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lda :col ; Set the offset values based on the column
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asl ; of this tile
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asl
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stal 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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adcl TileStore+TS_BASE_ADDR,x
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stal TileStore+TS_CODE_ADDR_LOW,x ; Low word of the tile address in the code field
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dec :col
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bpl :hop
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dec :row
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lda #40
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sta :col
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:hop
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dex
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dex
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bpl :loop
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rts
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@ -41,40 +41,13 @@
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TILE_CTRL_MASK equ $FE00
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TILE_PROC_MASK equ $F800 ; Select tile proc for rendering
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; Low-level function to take a tile descriptor and return the address in the tiledata
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; bank. This is not too useful in the fast-path because the fast-path does more
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; incremental calculations, but it is handy for other utility functions
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;
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; A = tile descriptor
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;
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; The address is the TileID * 128 + (HFLIP * 64)
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GetTileAddr ENT
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jsr _GetTileAddr
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rtl
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_GetTileAddr
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asl ; Multiply by 2
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bit #2*TILE_HFLIP_BIT ; Check if the horizontal flip bit is set
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beq :no_flip
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inc ; Set the LSB
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:no_flip asl ; x4
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asl ; x8
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asl ; x16
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asl ; x32
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asl ; x64
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asl ; x128
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rts
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; Use some temporary space for the spriteIdx array (maximum of 4 entries)
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stkSave equ tmp9
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screenAddr equ tmp10
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tileAddr equ tmp11
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spriteIdx equ tmp12
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; Ignore the horizontal flip bit
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_GetBaseTileAddr
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asl ; Multiply by 2
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asl ; x4
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asl ; x8
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asl ; x16
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asl ; x32
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asl ; x64
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asl ; x128
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rts
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; On entry
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;
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; B is set to the correct BG1 data bank
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@ -115,7 +88,7 @@ _RenderTile2
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bne do_dirty_sprite
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; Handle the non-sprite tile blit
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CopyNoSprites
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sep #$20
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lda TileStore+TS_CODE_ADDR_HIGH,x ; load the bank of the target code field line
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pha ; and put on the stack for later
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@ -182,75 +155,75 @@ dirty_sprite_dispatch
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; because that code draws directly to the graphics screen, and this code draws
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; to a temporary budder that has a different stride.
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ldy TileStore+TS_VBUFF_ARRAY_ADDR,x ; base address of the VBUFF sprite address array for this tile
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; ldy TileStore+TS_VBUFF_ARRAY_ADDR,x ; base address of the VBUFF sprite address array for this tile
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;
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; lsr
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; bcc :loop_0_bit_1
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; dobit $0000;sprite_ptr0;:loop_1_bit_1;CopyOneSprite
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lsr
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bcc :loop_0_bit_1
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dobit $0000;sprite_ptr0;:loop_1_bit_1;CopyOneSprite
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;:loop_0_bit_1 lsr
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; bcc :loop_0_bit_2
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; dobit $0002;sprite_ptr0;:loop_1_bit_2;CopyOneSprite
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:loop_0_bit_1 lsr
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bcc :loop_0_bit_2
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dobit $0002;sprite_ptr0;:loop_1_bit_2;CopyOneSprite
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;:loop_0_bit_2 lsr
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; bcc :loop_0_bit_3
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; dobit $0004;sprite_ptr0;:loop_1_bit_3;CopyOneSprite
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:loop_0_bit_2 lsr
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bcc :loop_0_bit_3
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dobit $0004;sprite_ptr0;:loop_1_bit_3;CopyOneSprite
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;:loop_0_bit_3 lsr
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; bcc :loop_0_bit_4
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; dobit $0006;sprite_ptr0;:loop_1_bit_4;CopyOneSprite
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:loop_0_bit_3 lsr
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bcc :loop_0_bit_4
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dobit $0006;sprite_ptr0;:loop_1_bit_4;CopyOneSprite
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;:loop_0_bit_4 lsr
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; bcc :loop_0_bit_5
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; dobit $0008;sprite_ptr0;:loop_1_bit_5;CopyOneSprite
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:loop_0_bit_4 lsr
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bcc :loop_0_bit_5
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dobit $0008;sprite_ptr0;:loop_1_bit_5;CopyOneSprite
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;:loop_0_bit_5 lsr
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; bcc :loop_0_bit_6
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; dobit $000A;sprite_ptr0;:loop_1_bit_6;CopyOneSprite
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:loop_0_bit_5 lsr
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bcc :loop_0_bit_6
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dobit $000A;sprite_ptr0;:loop_1_bit_6;CopyOneSprite
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;:loop_0_bit_6 lsr
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; bcc :loop_0_bit_7
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; dobit $000C;sprite_ptr0;:loop_1_bit_7;CopyOneSprite
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:loop_0_bit_6 lsr
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bcc :loop_0_bit_7
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dobit $000C;sprite_ptr0;:loop_1_bit_7;CopyOneSprite
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;:loop_0_bit_7 lsr
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; bcc :loop_0_bit_8
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; dobit $000E;sprite_ptr0;:loop_1_bit_8;CopyOneSprite
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:loop_0_bit_7 lsr
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bcc :loop_0_bit_8
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dobit $000E;sprite_ptr0;:loop_1_bit_8;CopyOneSprite
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;:loop_0_bit_8 lsr
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; bcc :loop_0_bit_9
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; dobit $0010;sprite_ptr0;:loop_1_bit_9;CopyOneSprite
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:loop_0_bit_8 lsr
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bcc :loop_0_bit_9
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dobit $0010;sprite_ptr0;:loop_1_bit_9;CopyOneSprite
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;:loop_0_bit_9 lsr
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; bcc :loop_0_bit_10
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; ldx: $0012,y
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; stx spriteIdx
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; cmp #0
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; jne :loop_1_bit_10
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; jmp CopyOneSprite
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:loop_0_bit_9 lsr
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bcc :loop_0_bit_10
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ldx: $0012,y
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stx spriteIdx
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cmp #0
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jne :loop_1_bit_10
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jmp CopyOneSprite
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;:loop_0_bit_10 lsr
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; bcc :loop_0_bit_11
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; dobit $0014;sprite_ptr0;:loop_1_bit_11;CopyOneSprite
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:loop_0_bit_10 lsr
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bcc :loop_0_bit_11
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dobit $0014;sprite_ptr0;:loop_1_bit_11;CopyOneSprite
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;:loop_0_bit_11 lsr
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; bcc :loop_0_bit_12
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; dobit $0016;sprite_ptr0;:loop_1_bit_12;CopyOneSprite
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:loop_0_bit_11 lsr
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bcc :loop_0_bit_12
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dobit $0016;sprite_ptr0;:loop_1_bit_12;CopyOneSprite
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;:loop_0_bit_12 lsr
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; bcc :loop_0_bit_13
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; dobit $0018;sprite_ptr0;:loop_1_bit_13;CopyOneSprite
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:loop_0_bit_12 lsr
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bcc :loop_0_bit_13
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dobit $0018;sprite_ptr0;:loop_1_bit_13;CopyOneSprite
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;:loop_0_bit_13 lsr
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; bcc :loop_0_bit_14
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; dobit $001A;sprite_ptr0;:loop_1_bit_14;CopyOneSprite
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:loop_0_bit_13 lsr
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bcc :loop_0_bit_14
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dobit $001A;sprite_ptr0;:loop_1_bit_14;CopyOneSprite
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;:loop_0_bit_14 lsr
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; bcc :loop_0_bit_15
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; dobit $001C;sprite_ptr0;:loop_1_bit_15;CopyOneSprite
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:loop_0_bit_14 lsr
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bcc :loop_0_bit_15
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dobit $001C;sprite_ptr0;:loop_1_bit_15;CopyOneSprite
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:loop_0_bit_15 ldx: $001E,y
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stx spriteIdx
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jmp CopyOneSprite
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;:loop_0_bit_15 ldx: $001E,y
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; stx spriteIdx
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; jmp CopyOneSprite
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; We can optimize later, for now just copy the sprite data and mask into its own
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; direct page buffer and combine with the tile data later
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@ -388,12 +361,10 @@ CopyOneSprite
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]line equ 0
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lup 8
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ldal tiledata,x
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and [spriteIdx]
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ora (spriteIdx)
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sta tmp_sprite_data+{]line*4}
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; ldal tiledata,x
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; and [spriteIdx]
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; ora (spriteIdx)
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; sta tmp_sprite_data+{]line*4}
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ldal spritedata+{]line*SPRITE_PLANE_SPAN},x
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sta tmp_sprite_data+{]line*4}
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@ -790,93 +761,6 @@ _CopyBG1Tile
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DirtyTileCount ds 2
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DirtyTiles ds TILE_STORE_SIZE ; At most this many tiles can possibly be update at once
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; Initialize the tile storage data structures. This takes care of populating the tile records with the
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; appropriate constant values.
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InitTiles
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:col equ tmp0
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:row equ tmp1
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:vbuff equ tmp2
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; Fill in the TileStoreYTable. This is just a table of offsets into the Tile Store for each row. There
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; are 26 rows with a stride of 41
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ldy #0
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lda #0
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:yloop
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sta TileStoreYTable,y
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clc
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adc #41*2
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iny
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iny
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cpy #26*2
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bcc :yloop
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; Next, initialize the Tile Store itself
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ldx #TILE_STORE_SIZE-2
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lda #25
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sta :row
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lda #40
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sta :col
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lda #$8000
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sta :vbuff
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:loop
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; The first set of values in the Tile Store are changed during each frame based on the actions
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; that are happening
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lda #0
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stal TileStore+TS_TILE_ID,x ; clear the tile store with the special zero tile
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stal TileStore+TS_TILE_ADDR,x
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stal TileStore+TS_SPRITE_FLAG,x ; no sprites are set at the beginning
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stal TileStore+TS_DIRTY,x ; none of the tiles are dirty
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lda DirtyTileProcs ; Fill in with the first dispatch address
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stal TileStore+TS_DIRTY_TILE_DISP,x
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lda TileProcs ; Same for non-dirty, non-sprite base case
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stal TileStore+TS_BASE_TILE_DISP,x
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lda :vbuff ; array of sprite vbuff addresses per tile
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stal TileStore+TS_VBUFF_ARRAY_ADDR,x
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clc
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adc #32
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sta :vbuff
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; The next set of values are constants that are simply used as cached parameters to avoid needing to
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; calculate any of these values during tile rendering
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lda :row ; Set the long address of where this tile
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asl ; exists in the code fields
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tay
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lda BRowTableHigh,y
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stal TileStore+TS_CODE_ADDR_HIGH,x ; High word of the tile address (just the bank)
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lda BRowTableLow,y
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stal TileStore+TS_BASE_ADDR,x ; May not be needed later if we can figure out the right constant...
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lda :col ; Set the offset values based on the column
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asl ; of this tile
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asl
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stal 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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adcl TileStore+TS_BASE_ADDR,x
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stal TileStore+TS_CODE_ADDR_LOW,x ; Low word of the tile address in the code field
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dec :col
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bpl :hop
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dec :row
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lda #40
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sta :col
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:hop
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dex
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dex
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bpl :loop
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rts
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_ClearDirtyTiles
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bra :hop
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:loop
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