mirror of
https://github.com/lscharen/iigs-game-engine.git
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Complete masked tile rendering implementation
The core data tables were reworked to pre-reverse all of the entries to directly match the right-to-left ordering of the code fields. This simplified some code but was required for register reuse in the masked tile renderer. Also fixed several offset calculation issues in the masked tile renderer.
This commit is contained in:
Lucas Scharenbroich
parent
5ad95f4609
commit
b35a2c1e6e
@ -119,7 +119,11 @@ _Err mac
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NoErr eom
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; MAcros to use in the Masked Tile renderer
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; Macros to use in the Masked Tile renderer
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;
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; ]1 : tiledata offset
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; ]2 : tilemask offset
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; ]3 : code field offset
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CopyMaskedWord MAC
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ldal ]2,x ; load the mask value
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bne mixed ; a non-zero value may be mixed
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@ -141,7 +145,9 @@ mixed cmp #$FFFF ; All 1's in the mask is fully transparent
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ldx _X_REG ; Get the addressing offset
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ldal JTableOffset,x ; Get the address offset and add to the base address
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adc _BASE_ADDR ; of the current code field line (could be an ORA, too)
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clc ; may be able to be removed...
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adc _BASE_ADDR ; of the current code field line
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adc #{]3&$F000} ; adjust for the current row offset
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sta: ]3+1,y
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tay ; This becomes the new address that we use to patch in
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@ -151,9 +157,9 @@ mixed cmp #$FFFF ; All 1's in the mask is fully transparent
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sta: $0000,y
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ldx _T_PTR ; restore the original x-register value
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ldal ]1,x ; insert the tile mask and data into the exception
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ldal ]2,x ; insert the tile mask and data into the exception
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sta: $0003,y ; handler.
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ldal ]2,x
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ldal ]1,x
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sta: $0006,y
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ldy _Y_REG ; restore original y-register value and move on
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@ -169,33 +175,3 @@ transparent
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next
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eom
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@ -129,6 +129,13 @@ NO_MUSIC equ 1 ; turn music + tool load
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; Set up our level data
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jsr BG0SetUp
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ldx #0
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ldy #0
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lda #56
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jsr CopyTile
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; jsr Render
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jsr WaitForKey
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; Allocate room to load data
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jsr AllocOneBank2 ; Alloc 64KB for Load/Unpack
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@ -505,7 +512,7 @@ CopyBinToField
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lda BTableHigh,x
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sta :dstptr+2
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ldx #162 ; move backwards in the code field
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; ldx #162 ; move backwards in the code field
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ldy #0 ; move forward in the image data
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lda #82 ; keep a running column count
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@ -524,9 +531,11 @@ CopyBinToField
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; This is a solid word
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:solid
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lda [:srcptr],y
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ldy Col2CodeOffset,x ; Get the offset to the code from the line start
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pha ; Save the data
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lda Col2CodeOffset,y ; Get the offset to the code from the line start
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tay
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lda #$00F4 ; PEA instruction
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sta [:dstptr],y
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iny
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@ -538,7 +547,8 @@ CopyBinToField
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cmp #$A5A5
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beq :solid
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ldy Col2CodeOffset,x ; Get the offset to the code from the line start
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lda Col2CodeOffset,y ; Get the offset to the code from the line start
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tay
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lda #$B1 ; LDA (dp),y
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sta [:dstptr],y
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iny
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@ -552,7 +562,9 @@ CopyBinToField
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lda [:srcptr],y ; Refetch the screen data
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sta :data
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ldy Col2CodeOffset,x ; Get the offset into the code field
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tyx
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lda Col2CodeOffset,y ; Get the offset into the code field
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tay
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lda #$4C ; JMP exception
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sta [:dstptr],y
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iny
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@ -583,8 +595,8 @@ CopyBinToField
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:next
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ply
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dex
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dex
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; dex
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; dex
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iny
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iny
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@ -684,7 +696,7 @@ CopyPicToField
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lda BTableHigh,x
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sta :dstptr+2
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ldx #162 ; move backwards in the code field
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; ldx #162 ; move backwards in the code field
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ldy #0 ; move forward in the image data
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lda #80 ; keep a running column count
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@ -701,9 +713,11 @@ CopyPicToField
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; This is a solid word
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lda [:srcptr],y
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ldy Col2CodeOffset,x ; Get the offset to the code from the line start
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pha ; Save the data
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lda Col2CodeOffset,y ; Get the offset to the code from the line start
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tay
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lda #$00F4 ; PEA instruction
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sta [:dstptr],y
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iny
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@ -711,7 +725,9 @@ CopyPicToField
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sta [:dstptr],y ; PEA operand
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bra :next
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:transparent
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ldy Col2CodeOffset,x ; Get the offset to the code from the line start
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lda Col2CodeOffset,y ; Get the offset to the code from the line start
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tay
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lda #$B1 ; LDA (dp),y
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sta [:dstptr],y
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iny
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@ -725,7 +741,10 @@ CopyPicToField
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lda [:srcptr],y ; Refetch the screen data
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sta :data
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ldy Col2CodeOffset,x ; Get the offset into the code field
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tyx
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lda Col2CodeOffset,y ; Get the offset into the code field
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tay
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lda #$4C ; JMP exception
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sta [:dstptr],y
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iny
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@ -754,8 +773,8 @@ CopyPicToField
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:next
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ply
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dex
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dex
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; dex
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; dex
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iny
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iny
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@ -1279,20 +1298,3 @@ qtRec adrl $0000
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PUT TileMap.s
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PUT App.TileMapBG0.s
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PUT App.TileMapBG1.s
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@ -220,30 +220,31 @@ _ApplyBG0XPos
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; | JMP loop |
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; +-----------+
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; lda #163
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; sec
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; sbc StartXMod164
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lda StartXMod164
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; tay
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; Right now we have the offset of the left-edge visible byte. Move one byte earlier to figure out
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; where the exit will be patched in
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dec ; (a - 1) % 164
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bpl :hop1
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lda #163
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sec
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sbc StartXMod164
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tay
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; Right now we have the offset of the last visible byte. Add one to get the offset
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; of the byte that will be patched for an exit.
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inc ; (a + 1) % 164
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cmp #164
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bcc :hop1
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lda #0
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:hop1
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; If the exit byte is an even value, then this is the spot to exit. If it's an
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; odd value, then round down and use the odd exit path in the blitter to push
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; the high byte of the word.
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; If the exit byte is odd, then the left edge is even-aligned and we round down and exit at at
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; that word.
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;
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; If the exit byte is even, then the left edge is odd-aligned and we exit at this word.
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bit #$0001
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bne :odd_exit
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beq :odd_exit
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; This is the even code path
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and #$FFFE
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tax
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lda CodeFieldEvenBRA,x
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sta :exit_bra
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@ -253,33 +254,34 @@ _ApplyBG0XPos
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bra :do_entry
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; This is the odd code path
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:odd_exit and #$FFFE
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tax
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:odd_exit tax
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lda CodeFieldOddBRA,x
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sta :exit_bra
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lda Col2CodeOffset,X
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sta :exit_offset
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sta LastPatchOffset ; Cache as a flag for later
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; Calculate the entry byte into the code field
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:do_entry tya ; reload 163 - x % 164
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sec
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sbc ScreenWidth ; back up to entry point
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inc
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bpl :hop2
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; Calculate the entry point into the code field by calculating the right edge
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:do_entry lda StartXMod164
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clc
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adc #164
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adc ScreenWidth ; move to the right edge and back up a byte
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dec ; to get the index of the first on-screen byte
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cmp #164 ; Keep the value in range
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bcc :hop2
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sbc #164
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:hop2
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; If the entry index is even, then just go to that column. If it's odd, then we
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; enter the field at the _next_ column and change the entry code to take care of
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; pushing the low byte. In both cases we set the same entry address, but update
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; the blitter opcode at entry_jmp, and for odd entries point, we also need to
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; set the address of odd_entry in the code field
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; Same logic as above. If the right edge is odd, then the full word needs to be drawn and we
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; will enter at that index, rounded down.
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;
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; If the right edge is even, then only the low byte needs to be drawn, which is handled before
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; entering the code field. So enter one word before the right edge.
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bit #$0001
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bne :odd_entry
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beq :odd_entry
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and #$FFFE
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tax
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lda Col2CodeOffset,x
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sta :entry_offset
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@ -289,12 +291,11 @@ _ApplyBG0XPos
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bra :prep_complete
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:odd_entry
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and #$FFFE
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tax
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lda Col2CodeOffset,x
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sta :entry_offset
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lda Col2CodeOffset+2,x
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sta :odd_entry_offset
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sta :entry_offset ; Will be used to load the data
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lda Col2CodeOffset-2,x
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sta :odd_entry_offset ; will the the actual location to jump to
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lda #$00AF ; set the entry_jmp opcode to LDAL
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sta :opcode
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:prep_complete
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@ -752,3 +753,10 @@ SetCodeEntryOpcode
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@ -13,195 +13,205 @@
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; lda #DATA
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; ldx Col2CodeOffset,y
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; sta $0001,x
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;
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; The table values are pre-reversed so that loop can go in logical order 0, 2, 4, ...
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; and the resulting offsets will map to the code instructions in right-to-left order.
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;
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; Remember, because the data is pushed on to the stask, the last instruction, which is
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; in the highest memory location, pushed data that apepars on the left edge of the screen.
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PER_TILE_SIZE equ 3
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]step equ 0
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dw CODE_TOP ; There is a spot where we load Col2CodeOffet-2,x
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Col2CodeOffset lup 82
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dw CODE_TOP+{]step*PER_TILE_SIZE}
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dw CODE_TOP+{{81-]step}*PER_TILE_SIZE}
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]step equ ]step+1
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--^
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dw CODE_TOP
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; dw CODE_TOP
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; A parallel table to Col2CodeOffset that holds the offset to the exception handler address for each column
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SNIPPET_SIZE equ 32
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]step equ 0
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dw SNIPPET_BASE
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JTableOffset lup 82
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dw SNIPPET_BASE+{]step*SNIPPET_SIZE}
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dw SNIPPET_BASE+{{81-]step}*SNIPPET_SIZE}
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]step equ ]step+1
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--^
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dw SNIPPET_BASE
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; Table of BRA instructions that are used to exit the code field. Separate tables for
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; even and odd aligned cases.
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;
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; The even exit point is closest to the code field. The odd exit point is 3 bytes further
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;
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; These tables are reversed to be parallel with the JTableOffset and Col2CodeOffset tables above. The
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; physical word index that each instruction is intended to be placed at is in the comment.
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CodeFieldEvenBRA
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bra *-3 ; 0
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bra *-6 ; 1
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bra *-9 ; 2
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bra *-12 ; 3
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bra *-15 ; 4
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bra *-18 ; 5
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bra *-21 ; 6
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bra *-24 ; 7
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bra *-27 ; 8
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bra *-30 ; 9
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bra *-33 ; 10
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bra *-36 ; 11
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bra *-39 ; 12
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bra *-42 ; 13
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bra *-45 ; 14
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bra *-48 ; 15
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bra *-51 ; 16
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bra *-54 ; 17
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bra *-57 ; 18
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bra *-60 ; 19
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bra *-63 ; 20
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bra *-66 ; 21
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bra *-69 ; 22
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bra *-72 ; 23
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bra *-75 ; 24
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bra *-78 ; 25
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bra *-81 ; 26
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bra *-84 ; 27
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bra *-87 ; 28
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bra *-90 ; 29
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bra *-93 ; 30
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bra *-96 ; 31
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bra *-99 ; 32
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bra *-102 ; 33
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bra *-105 ; 34
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bra *-108 ; 35
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bra *-111 ; 36
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bra *-114 ; 37
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bra *-117 ; 38
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bra *-120 ; 39
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bra *-123 ; 40
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bra *+126 ; 41
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bra *+123 ; 42
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bra *+120 ; 43
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bra *+117 ; 44
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bra *+114 ; 45
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bra *+111 ; 46
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bra *+108 ; 47
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bra *+105 ; 48
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bra *+102 ; 49
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bra *+99 ; 50
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bra *+96 ; 51
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bra *+93 ; 52
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bra *+90 ; 53
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bra *+87 ; 54
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bra *+84 ; 55
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bra *+81 ; 56
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bra *+78 ; 57
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bra *+75 ; 58
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bra *+72 ; 59
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bra *+69 ; 60
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bra *+66 ; 61
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bra *+63 ; 62
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bra *+60 ; 63
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bra *+57 ; 64
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bra *+54 ; 65
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bra *+51 ; 66
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bra *+48 ; 67
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bra *+45 ; 68
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bra *+42 ; 69
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bra *+39 ; 70
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bra *+36 ; 71
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bra *+33 ; 72
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bra *+30 ; 73
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bra *+27 ; 74
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bra *+24 ; 75
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bra *+21 ; 76
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bra *+18 ; 77
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bra *+15 ; 78
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bra *+12 ; 79
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bra *+9 ; 80
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bra *+6 ; 81 -- need to skip over the JMP loop that passed control back
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bra *+9 ; 80
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bra *+12 ; 79
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bra *+15 ; 78
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bra *+18 ; 77
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bra *+21 ; 76
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bra *+24 ; 75
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bra *+27 ; 74
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bra *+30 ; 73
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bra *+33 ; 72
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bra *+36 ; 71
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bra *+39 ; 70
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bra *+42 ; 69
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bra *+45 ; 68
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bra *+48 ; 67
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bra *+51 ; 66
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bra *+54 ; 65
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bra *+57 ; 64
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bra *+60 ; 63
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bra *+63 ; 62
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bra *+66 ; 61
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bra *+69 ; 60
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bra *+72 ; 59
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bra *+75 ; 58
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bra *+78 ; 57
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bra *+81 ; 56
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bra *+84 ; 55
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bra *+87 ; 54
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bra *+90 ; 53
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bra *+93 ; 52
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bra *+96 ; 51
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bra *+99 ; 50
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bra *+102 ; 49
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bra *+105 ; 48
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bra *+108 ; 47
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bra *+111 ; 46
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bra *+114 ; 45
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bra *+117 ; 44
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bra *+120 ; 43
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bra *+123 ; 42
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bra *+126 ; 41
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bra *-123 ; 40
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bra *-120 ; 39
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bra *-117 ; 38
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bra *-114 ; 37
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bra *-111 ; 36
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bra *-108 ; 35
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bra *-105 ; 34
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bra *-102 ; 33
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bra *-99 ; 32
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bra *-96 ; 31
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bra *-93 ; 30
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bra *-90 ; 29
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bra *-87 ; 28
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bra *-84 ; 27
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bra *-81 ; 26
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bra *-78 ; 25
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bra *-75 ; 24
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bra *-72 ; 23
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bra *-69 ; 22
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bra *-66 ; 21
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bra *-63 ; 20
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bra *-60 ; 19
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bra *-57 ; 18
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bra *-54 ; 17
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bra *-51 ; 16
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bra *-48 ; 15
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bra *-45 ; 14
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bra *-42 ; 13
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bra *-39 ; 12
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bra *-36 ; 11
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bra *-33 ; 10
|
||||
bra *-30 ; 9
|
||||
bra *-27 ; 8
|
||||
bra *-24 ; 7
|
||||
bra *-21 ; 6
|
||||
bra *-18 ; 5
|
||||
bra *-15 ; 4
|
||||
bra *-12 ; 3
|
||||
bra *-9 ; 2
|
||||
bra *-6 ; 1
|
||||
bra *-3 ; 0
|
||||
|
||||
CodeFieldOddBRA
|
||||
bra *-6 ; 0 -- branch back 6 to skip the JMP even path
|
||||
bra *-9 ; 1
|
||||
bra *-12 ; 2
|
||||
bra *-15 ; 3
|
||||
bra *-18 ; 4
|
||||
bra *-21 ; 5
|
||||
bra *-24 ; 6
|
||||
bra *-27 ; 7
|
||||
bra *-30 ; 8
|
||||
bra *-33 ; 9
|
||||
bra *-36 ; 10
|
||||
bra *-39 ; 11
|
||||
bra *-42 ; 12
|
||||
bra *-45 ; 13
|
||||
bra *-48 ; 14
|
||||
bra *-51 ; 15
|
||||
bra *-54 ; 16
|
||||
bra *-57 ; 17
|
||||
bra *-60 ; 18
|
||||
bra *-63 ; 19
|
||||
bra *-66 ; 20
|
||||
bra *-69 ; 21
|
||||
bra *-72 ; 22
|
||||
bra *-75 ; 23
|
||||
bra *-78 ; 24
|
||||
bra *-81 ; 25
|
||||
bra *-84 ; 26
|
||||
bra *-87 ; 27
|
||||
bra *-90 ; 28
|
||||
bra *-93 ; 29
|
||||
bra *-96 ; 30
|
||||
bra *-99 ; 31
|
||||
bra *-102 ; 32
|
||||
bra *-105 ; 33
|
||||
bra *-108 ; 34
|
||||
bra *-111 ; 35
|
||||
bra *-114 ; 36
|
||||
bra *-117 ; 37
|
||||
bra *-120 ; 38
|
||||
bra *-123 ; 39
|
||||
bra *-126 ; 40
|
||||
bra *+129 ; 41
|
||||
bra *+126 ; 42
|
||||
bra *+123 ; 43
|
||||
bra *+120 ; 44
|
||||
bra *+117 ; 45
|
||||
bra *+114 ; 46
|
||||
bra *+111 ; 47
|
||||
bra *+108 ; 48
|
||||
bra *+105 ; 49
|
||||
bra *+102 ; 50
|
||||
bra *+99 ; 51
|
||||
bra *+96 ; 52
|
||||
bra *+93 ; 53
|
||||
bra *+90 ; 54
|
||||
bra *+87 ; 55
|
||||
bra *+84 ; 56
|
||||
bra *+81 ; 57
|
||||
bra *+78 ; 58
|
||||
bra *+75 ; 59
|
||||
bra *+72 ; 60
|
||||
bra *+69 ; 61
|
||||
bra *+66 ; 62
|
||||
bra *+63 ; 64
|
||||
bra *+60 ; 64
|
||||
bra *+57 ; 65
|
||||
bra *+54 ; 66
|
||||
bra *+51 ; 67
|
||||
bra *+48 ; 68
|
||||
bra *+45 ; 69
|
||||
bra *+42 ; 70
|
||||
bra *+39 ; 71
|
||||
bra *+36 ; 72
|
||||
bra *+33 ; 73
|
||||
bra *+30 ; 74
|
||||
bra *+27 ; 75
|
||||
bra *+24 ; 76
|
||||
bra *+21 ; 77
|
||||
bra *+18 ; 78
|
||||
bra *+15 ; 79
|
||||
bra *+12 ; 80
|
||||
bra *+9 ; 81 -- need to skip over two JMP instructions
|
||||
bra *+12 ; 80
|
||||
bra *+15 ; 79
|
||||
bra *+18 ; 78
|
||||
bra *+21 ; 77
|
||||
bra *+24 ; 76
|
||||
bra *+27 ; 75
|
||||
bra *+30 ; 74
|
||||
bra *+33 ; 73
|
||||
bra *+36 ; 72
|
||||
bra *+39 ; 71
|
||||
bra *+42 ; 70
|
||||
bra *+45 ; 69
|
||||
bra *+48 ; 68
|
||||
bra *+51 ; 67
|
||||
bra *+54 ; 66
|
||||
bra *+57 ; 65
|
||||
bra *+60 ; 64
|
||||
bra *+63 ; 64
|
||||
bra *+66 ; 62
|
||||
bra *+69 ; 61
|
||||
bra *+72 ; 60
|
||||
bra *+75 ; 59
|
||||
bra *+78 ; 58
|
||||
bra *+81 ; 57
|
||||
bra *+84 ; 56
|
||||
bra *+87 ; 55
|
||||
bra *+90 ; 54
|
||||
bra *+93 ; 53
|
||||
bra *+96 ; 52
|
||||
bra *+99 ; 51
|
||||
bra *+102 ; 50
|
||||
bra *+105 ; 49
|
||||
bra *+108 ; 48
|
||||
bra *+111 ; 47
|
||||
bra *+114 ; 46
|
||||
bra *+117 ; 45
|
||||
bra *+120 ; 44
|
||||
bra *+123 ; 43
|
||||
bra *+126 ; 42
|
||||
bra *+129 ; 41
|
||||
bra *-126 ; 40
|
||||
bra *-123 ; 39
|
||||
bra *-120 ; 38
|
||||
bra *-117 ; 37
|
||||
bra *-114 ; 36
|
||||
bra *-111 ; 35
|
||||
bra *-108 ; 34
|
||||
bra *-105 ; 33
|
||||
bra *-102 ; 32
|
||||
bra *-99 ; 31
|
||||
bra *-96 ; 30
|
||||
bra *-93 ; 29
|
||||
bra *-90 ; 28
|
||||
bra *-87 ; 27
|
||||
bra *-84 ; 26
|
||||
bra *-81 ; 25
|
||||
bra *-78 ; 24
|
||||
bra *-75 ; 23
|
||||
bra *-72 ; 22
|
||||
bra *-69 ; 21
|
||||
bra *-66 ; 20
|
||||
bra *-63 ; 19
|
||||
bra *-60 ; 18
|
||||
bra *-57 ; 17
|
||||
bra *-54 ; 16
|
||||
bra *-51 ; 15
|
||||
bra *-48 ; 14
|
||||
bra *-45 ; 13
|
||||
bra *-42 ; 12
|
||||
bra *-39 ; 11
|
||||
bra *-36 ; 10
|
||||
bra *-33 ; 9
|
||||
bra *-30 ; 8
|
||||
bra *-27 ; 7
|
||||
bra *-24 ; 6
|
||||
bra *-21 ; 5
|
||||
bra *-18 ; 4
|
||||
bra *-15 ; 3
|
||||
bra *-12 ; 2
|
||||
bra *-9 ; 1
|
||||
bra *-6 ; 0 -- branch back 6 to skip the JMP even path
|
||||
|
||||
]step equ $2000
|
||||
ScreenAddr lup 200
|
||||
@ -242,12 +252,3 @@ BG1YTable lup 208
|
||||
BG1YOffsetTable lup 26
|
||||
dw 1,1,1,2,2,2,2,2,1,1,1,0,0,0,0,0
|
||||
--^
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
@ -53,6 +53,8 @@ TILE_CTRL_MASK equ $1E00
|
||||
;
|
||||
; tmp0/tmp1 is reserved
|
||||
RenderTile
|
||||
ora #TILE_MASK_BIT ; toture test -- make everything masked
|
||||
|
||||
bit #TILE_CTRL_MASK ; Fast path for "normal" tiles
|
||||
beq _CopyTile
|
||||
cmp #TILE_MASK_BIT ; Tile 0 w/mask bit set is special, too
|
||||
@ -70,7 +72,7 @@ RenderTile
|
||||
and #TILE_CTRL_MASK ; Mask out the different modifiers
|
||||
xba
|
||||
tax
|
||||
jmp (:actions,x)
|
||||
jmp masked ; (:actions,x)
|
||||
|
||||
:actions dw solid,solid_hflip,solid_vflip,solid_hvflip
|
||||
dw dynamic,dynamic,dynamic,dynamic
|
||||
@ -198,22 +200,34 @@ CopyTileMemM
|
||||
sta _T_PTR
|
||||
tax
|
||||
|
||||
; Do the left column first
|
||||
|
||||
CopyMaskedWord tiledata+0;tiledata+32+0;$0003
|
||||
CopyMaskedWord tiledata+2;tiledata+32+2;$0000
|
||||
CopyMaskedWord tiledata+4;tiledata+32+4;$1003
|
||||
CopyMaskedWord tiledata+6;tiledata+32+6;$1000
|
||||
CopyMaskedWord tiledata+8;tiledata+32+8;$2003
|
||||
CopyMaskedWord tiledata+10;tiledata+32+10;$2000
|
||||
CopyMaskedWord tiledata+12;tiledata+32+12;$3003
|
||||
CopyMaskedWord tiledata+14;tiledata+32+14;$3000
|
||||
CopyMaskedWord tiledata+16;tiledata+32+16;$4003
|
||||
CopyMaskedWord tiledata+18;tiledata+32+18;$4000
|
||||
CopyMaskedWord tiledata+20;tiledata+32+20;$5003
|
||||
CopyMaskedWord tiledata+22;tiledata+32+22;$5000
|
||||
CopyMaskedWord tiledata+24;tiledata+32+24;$6003
|
||||
CopyMaskedWord tiledata+28;tiledata+32+26;$6000
|
||||
CopyMaskedWord tiledata+30;tiledata+32+28;$7003
|
||||
CopyMaskedWord tiledata+32;tiledata+32+30;$7000
|
||||
CopyMaskedWord tiledata+28;tiledata+32+28;$7003
|
||||
|
||||
; Move the index for the JTableOffset array. This is the same index used for transparent words,
|
||||
; so, if _X_REG is zero, then we would be patching out the last word in the code field with LDA (0),y
|
||||
; and then increment _X_REG by two to patch the next-to-last word in the code field with LDA (2),y
|
||||
|
||||
inc _X_REG
|
||||
inc _X_REG
|
||||
|
||||
; Do the right column
|
||||
|
||||
CopyMaskedWord tiledata+2;tiledata+32+2;$0000
|
||||
CopyMaskedWord tiledata+6;tiledata+32+6;$1000
|
||||
CopyMaskedWord tiledata+10;tiledata+32+10;$2000
|
||||
CopyMaskedWord tiledata+14;tiledata+32+14;$3000
|
||||
CopyMaskedWord tiledata+18;tiledata+32+18;$4000
|
||||
CopyMaskedWord tiledata+22;tiledata+32+22;$5000
|
||||
CopyMaskedWord tiledata+26;tiledata+32+26;$6000
|
||||
CopyMaskedWord tiledata+30;tiledata+32+30;$7000
|
||||
|
||||
rts
|
||||
|
||||
@ -564,19 +578,20 @@ CopyTile
|
||||
pha ; save for a few instruction
|
||||
rep #$20
|
||||
|
||||
phx ; Reverse the tile index since x = 0 is at the end
|
||||
lda #40
|
||||
sec
|
||||
sbc 1,s
|
||||
plx
|
||||
|
||||
; phx ; Reverse the tile index since x = 0 is at the end
|
||||
; lda #40
|
||||
; sec
|
||||
; sbc 1,s
|
||||
; plx
|
||||
txa
|
||||
asl ; there are two columns per tile, so multiple by 4
|
||||
asl ; asl will clear the carry bit
|
||||
tax
|
||||
|
||||
lda BTableLow,y
|
||||
sta _BASE_ADDR ; Used in masked tile renderer
|
||||
clc
|
||||
adc Col2CodeOffset,x
|
||||
adc Col2CodeOffset+2,x ; Get the right edge (which is the lower physical address)
|
||||
tay
|
||||
|
||||
; Optimization note: We could make a Tile2CodeOffset table that is pre-reversed, which should simplify
|
||||
@ -598,4 +613,3 @@ CopyTile
|
||||
plx ; pop the x-register
|
||||
plb ; restore the data bank and return
|
||||
rts
|
||||
|
||||
|
||||
Loading…
x
Reference in New Issue
Block a user