105 lines
4.1 KiB
ArmAsm
105 lines
4.1 KiB
ArmAsm
; _TBDynamicTile
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;
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; These subroutines fill in the code field with the instructions to render data from the dynamic
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; code buffer. This is a bit different, because no tile data is manipulated. It is the
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; responsibiliy of the user of the API to use the CopyTileToDyn subroutine to get data
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; into the correct location.
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;
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; This tile type does not explicitly support horizontal or vertical flipping. An appropriate tile
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; descriptor should be passed into CopyTileToDyn to put the horizontally or vertically flipped source
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; data into the dynamic tile buffer
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_TBDynamicTile_00
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jsr _TBDynamicData
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jmp _TBFillLdaDpOpcode
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_TBDynamic
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ldal TileStore+TS_TILE_ID,x
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and #$007F
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ora #$4800
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]line equ 0 ; render the first column
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lup 8
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sta: $0004+{]line*$1000},y
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]line equ ]line+1
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--^
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inc ; advance to the next word
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inc
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]line equ 0 ; render the second column
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lup 8
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sta: $0001+{]line*$1000},y
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]line equ ]line+1
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--^
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sep #$20
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lda #$B5
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sta: $0000,y
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sta: $0003,y
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sta $1000,y
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sta $1003,y
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sta $2000,y
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sta $2003,y
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sta $3000,y
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sta $3003,y
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sta $4000,y
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sta $4003,y
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sta $5000,y
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sta $5003,y
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sta $6000,y
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sta $6003,y
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sta $7000,y
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sta $7003,y
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rep #$20
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plb
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rts
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; Primitive to render a dynamic tile
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;
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; LDA 00,x / PHA where the operand is fixed when the tile is rendered
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; $B5 $00 $48
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_TBDynamicData
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lda _TILE_ID ; Get the original tile descriptor
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and #$007F ; clamp to < (32 * 4)
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ora #$4800 ; insert the PHA instruction
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]line equ 0 ; render the first column
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lup 8
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sta: $0004+{]line*$1000},y
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]line equ ]line+1
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--^
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inc ; advance to the next word
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inc
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]line equ 0 ; render the second column
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lup 8
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sta: $0001+{]line*$1000},y
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]line equ ]line+1
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--^
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rts
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; A simple helper function that fill in all of the opcodes of a tile with the LDA dp,x opcode.
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_TBFillLdaDpOpcode
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sep #$20
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lda #$B5
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sta: $0000,y
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sta: $0003,y
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sta $1000,y
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sta $1003,y
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sta $2000,y
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sta $2003,y
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sta $3000,y
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sta $3003,y
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sta $4000,y
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sta $4003,y
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sta $5000,y
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sta $5003,y
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sta $6000,y
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sta $6003,y
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sta $7000,y
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sta $7003,y
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rep #$20
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rts
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