Merge branch 'streamline-apply-bg0'
This commit is contained in:
Lucas Scharenbroich
commit
7c32c89493
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@ -56,12 +56,6 @@ appTmp0 equ 28
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stz StartY
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stz frameCount
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; Initialize the graphics screen playfield
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pea #320
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pea #200
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_GTESetScreenMode
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; Load a tileset
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pea #^tiledata
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@ -28,9 +28,7 @@ InitMemory lda EngineMode
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_NewHandle ; returns LONG Handle on stack
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plx ; base address of the new handle
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pla ; high address 00XX of the new handle (bank)
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; _Deref
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; stx Buff00
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; sta Buff00+2
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:no_bnk0_buff
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PushLong #0 ; space for result
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@ -41,9 +39,6 @@ InitMemory lda EngineMode
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_NewHandle ; returns LONG Handle on stack
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plx ; base address of the new handle
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pla ; high address 00XX of the new handle (bank)
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; _Deref
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; stx Buff01
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; sta Buff01+2
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PushLong #0 ; space for result
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@ -20,6 +20,7 @@ _RestoreBG0Opcodes
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:lines_left_x2 equ tmp2
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:draw_count_x2 equ tmp3
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:exit_offset equ tmp4
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:stk_save equ tmp5
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phb ; Save data bank
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@ -33,39 +34,36 @@ _RestoreBG0Opcodes
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lda LastPatchOffset ; If zero, there are no saved opcodes
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sta :exit_offset
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tsc
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sta :stk_save
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:loop
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ldx :virt_line_x2
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ldal BTableLow,x ; Get the address of the first code field line
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tay
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sep #$20
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ldal BTableHigh,x
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ldal BTableHigh,x ; This intentionally leaks one byte on the stack
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pha
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plb ; This is the bank that will receive the updates
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rep #$20
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txa ; lda :virt_line_x2
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and #$001E
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eor #$FFFF
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inc
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clc
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sec
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adc #32
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min :lines_left_x2
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sta :draw_count_x2 ; Do half of this many lines
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; y is already set to :base_address
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tax ; :draw_count * 2
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clc
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adc :virt_line_x2
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sta :virt_line_x2
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tya
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clc
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adc :exit_offset ; Add some offsets to get the base address in the code field line
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jsr RestoreOpcode
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lda :virt_line_x2 ; advance to the virtual line after the segment we just
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clc ; filled in
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adc :draw_count_x2
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sta :virt_line_x2
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RestoreOpcode
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lda :lines_left_x2 ; subtract the number of lines we just completed
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sec
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@ -73,9 +71,11 @@ _RestoreBG0Opcodes
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sta :lines_left_x2
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jne :loop
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stz LastPatchOffset ; Clear the value once completed
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:out
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lda :stk_save
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tcs
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plb
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rts
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@ -113,16 +113,16 @@ _ApplyBG0XPosPre
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_ApplyBG0XPos
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:virt_line equ tmp1
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:lines_left equ tmp2
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:draw_count equ tmp3
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:stk_save equ tmp0
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:virt_line_x2 equ tmp1
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:lines_left_x2 equ tmp2
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:draw_count_x2 equ tmp3
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:exit_offset equ tmp4
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:entry_offset equ tmp5
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:exit_bra equ tmp6
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:exit_address equ tmp7
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:base_address equ tmp8
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:draw_count_x2 equ tmp9
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:opcode equ tmp0
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:opcode equ tmp9
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:odd_entry_offset equ tmp10
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; If there are saved opcodes that have not been restored, do not run this routine
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@ -133,10 +133,12 @@ _ApplyBG0XPos
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; This code is fairly succinct. See the corresponding code in Vert.s for more detailed comments.
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:ok
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lda StartYMod208 ; This is the base line of the virtual screen
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sta :virt_line ; Keep track of it
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asl
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sta :virt_line_x2 ; Keep track of it
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lda ScreenHeight
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sta :lines_left
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asl
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sta :lines_left_x2
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; Calculate the exit and entry offsets into the code fields. This is a bit tricky, because odd-aligned
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; rendering causes the left and right edges to move in a staggered fashion.
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@ -280,32 +282,30 @@ _ApplyBG0XPos
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; 3. Writes the JMP entry point to enter the code field
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phb ; Save the existing bank
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tsc
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sta :stk_save
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:loop
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lda :virt_line
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asl ; This will clear the carry bit
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tax
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ldx :virt_line_x2
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ldal BTableLow,x ; Get the address of the first code field line
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tay ; Save it to use as the base address
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clc
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adc :exit_offset ; Add some offsets to get the base address in the code field line
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sta :exit_address
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sty :base_address
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sep #$20
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ldal BTableHigh,x
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pha
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plb ; This is the bank that will receive the updates
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rep #$20
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plb
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lda :virt_line
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and #$000F
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txa
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and #$001E
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eor #$FFFF
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inc
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clc
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adc #16
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min :lines_left
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sec
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adc #32
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min :lines_left_x2
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sta :draw_count ; Do this many lines
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asl
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sta :draw_count_x2
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; First step is to set the BRA instruction to exit the code field at the proper location. There
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@ -317,64 +317,55 @@ _ApplyBG0XPos
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; screen
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; y is already set to :base_address
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tax ; :draw_count_x2
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lda :exit_address ; Save from this location
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jsr SaveOpcode
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clc ; advance to the virtual line after the segment we just
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adc :virt_line_x2 ; filled in
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sta :virt_line_x2
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lda :exit_address ; Save from this location
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SaveOpcode ; X = :exit_address on return
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txy ; ldy :exit_address -- starting at this address
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ldx :draw_count_x2 ; Do this many lines
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lda :exit_bra ; Copy this value into all of the lines
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ldy :exit_address ; starting at this address
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jsr SetConst
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SetConst ; All registers are preserved
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; Next, patch in the CODE_ENTRY value, which is the low byte of a JMP instruction. This is an
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; 8-bit operation and, since the PEA code is bank aligned, we use the entry_offset value directly
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sep #$20
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ldx :draw_count_x2
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lda :entry_offset
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ldy :base_address
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jsr SetCodeEntry
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SetCodeEntry ; All registers are preserved
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; Now, patch in the opcode
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ldx :draw_count_x2
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lda :opcode
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ldy :base_address ; Y-register is preserved, this can be removed
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jsr SetCodeEntryOpcode
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SetCodeEntryOpcode ; All registers are preserved
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; If this is an odd entry, also set the odd_entry low byte and save the operand high byte
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lda :odd_entry_offset
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beq :not_odd
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jeq :not_odd
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ldx :draw_count_x2
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ldy :base_address ; Y-register is preserved, this can be removed
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jsr SetOddCodeEntry
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ldx :draw_count_x2
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ldy :base_address ; Y-register is preserved, this can be removed
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pei :exit_address
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jmp :SaveHighOperand ; Only used once, so "inline" it
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:save_high_op_rtn
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SetOddCodeEntry ; All registers are preserved
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SaveHighOperand :exit_address ; Only used once, so "inline" it
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:not_odd
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rep #$20
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rep #$21 ; clear the carry
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; Do the end of the loop -- update the virtual line counter and reduce the number
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; of lines left to render
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lda :virt_line ; advance to the virtual line after the segment we just
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clc ; filled in
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adc :draw_count
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sta :virt_line
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lda :lines_left ; subtract the number of lines we just completed
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lda :lines_left_x2 ; subtract the number of lines we just completed
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sec
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sbc :draw_count
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sta :lines_left
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sbc :draw_count_x2
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sta :lines_left_x2
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jne :loop
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lda :stk_save
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tcs
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plb
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rts
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@ -386,79 +377,78 @@ _ApplyBG0XPos
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; X = number of lines * 2, 0 to 32
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; Y = starting line * $1000
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; A = code field location * $1000
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:SaveHighOperand
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jmp (:tbl,x)
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SaveHighOperand mac
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jmp (dispTbl,x)
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dispTbl da bottom
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da do01,do02,do03,do04
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da do05,do06,do07,do08
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da do09,do10,do11,do12
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da do13,do14,do15,do16
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:tbl da :bottom
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da :do01,:do02,:do03,:do04
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da :do05,:do06,:do07,:do08
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da :do09,:do10,:do11,:do12
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da :do13,:do14,:do15,:do16
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:do15 plx
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bra :x15
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:do14 plx
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bra :x14
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:do13 plx
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bra :x13
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:do12 plx
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bra :x12
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:do11 plx
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bra :x11
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:do10 plx
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bra :x10
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:do09 plx
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bra :x09
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:do08 plx
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bra :x08
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:do07 plx
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bra :x07
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:do06 plx
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bra :x06
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:do05 plx
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bra :x05
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:do04 plx
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bra :x04
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:do03 plx
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bra :x03
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:do02 plx
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bra :x02
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:do01 plx
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bra :x01
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:do16 plx
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:x16 lda $F002,x
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do15 ldx ]1 ; accumulator is in 8-bit mode, so can't use TAX
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bra x15
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do14 ldx ]1
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bra x14
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do13 ldx ]1
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bra x13
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do12 ldx ]1
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bra x12
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do11 ldx ]1
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bra x11
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do10 ldx ]1
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bra x10
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do09 ldx ]1
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bra x09
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do08 ldx ]1
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bra x08
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do07 ldx ]1
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bra x07
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do06 ldx ]1
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bra x06
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do05 ldx ]1
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bra x05
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do04 ldx ]1
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bra x04
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do03 ldx ]1
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bra x03
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do02 ldx ]1
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bra x02
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do01 ldx ]1
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bra x01
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do16 ldx ]1
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x16 lda $F002,x
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sta OPCODE_HIGH_SAVE+$F000,y
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:x15 lda $E002,x
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x15 lda $E002,x
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sta OPCODE_HIGH_SAVE+$E000,y
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:x14 lda $D002,x
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x14 lda $D002,x
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sta OPCODE_HIGH_SAVE+$D000,y
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:x13 lda $C002,x
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x13 lda $C002,x
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sta OPCODE_HIGH_SAVE+$C000,y
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:x12 lda $B002,x
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x12 lda $B002,x
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sta OPCODE_HIGH_SAVE+$B000,y
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:x11 lda $A002,x
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x11 lda $A002,x
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sta OPCODE_HIGH_SAVE+$A000,y
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:x10 lda $9002,x
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x10 lda $9002,x
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sta OPCODE_HIGH_SAVE+$9000,y
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:x09 lda $8002,x
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x09 lda $8002,x
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sta OPCODE_HIGH_SAVE+$8000,y
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:x08 lda $7002,x
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x08 lda $7002,x
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sta OPCODE_HIGH_SAVE+$7000,y
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:x07 lda $6002,x
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x07 lda $6002,x
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sta OPCODE_HIGH_SAVE+$6000,y
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:x06 lda $5002,x
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x06 lda $5002,x
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sta OPCODE_HIGH_SAVE+$5000,y
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:x05 lda $4002,x
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x05 lda $4002,x
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sta OPCODE_HIGH_SAVE+$4000,y
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:x04 lda $3002,x
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x04 lda $3002,x
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sta OPCODE_HIGH_SAVE+$3000,y
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:x03 lda $2002,x
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x03 lda $2002,x
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sta OPCODE_HIGH_SAVE+$2000,y
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:x02 lda $1002,x
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x02 lda $1002,x
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sta OPCODE_HIGH_SAVE+$1000,y
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:x01 lda: $0002,x
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x01 lda: $0002,x
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sta: OPCODE_HIGH_SAVE+$0000,y
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:bottom jmp :save_high_op_rtn
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bottom <<<
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; SaveOpcode
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;
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@ -468,79 +458,79 @@ _ApplyBG0XPos
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; X = number of lines * 2, 0 to 32
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; Y = starting line * $1000
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; A = code field location * $1000
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SaveOpcode
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jmp (:tbl,x)
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SaveOpcode mac
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jmp (dispTbl,x)
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dispTbl da bottom
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da do01,do02,do03,do04
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da do05,do06,do07,do08
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da do09,do10,do11,do12
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da do13,do14,do15,do16
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:tbl da :bottom
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da :do01,:do02,:do03,:do04
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da :do05,:do06,:do07,:do08
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da :do09,:do10,:do11,:do12
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da :do13,:do14,:do15,:do16
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:do15 tax
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bra :x15
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:do14 tax
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bra :x14
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:do13 tax
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bra :x13
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:do12 tax
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bra :x12
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:do11 tax
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bra :x11
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:do10 tax
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bra :x10
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:do09 tax
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bra :x09
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:do08 tax
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bra :x08
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:do07 tax
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bra :x07
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:do06 tax
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||||
bra :x06
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||||
:do05 tax
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||||
bra :x05
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||||
:do04 tax
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||||
bra :x04
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||||
:do03 tax
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||||
bra :x03
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:do02 tax
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||||
bra :x02
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||||
:do01 tax
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||||
bra :x01
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||||
:do16 tax
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:x16 lda $F000,x
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do15 tax
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||||
bra x15
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||||
do14 tax
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||||
bra x14
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||||
do13 tax
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||||
bra x13
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||||
do12 tax
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bra x12
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do11 tax
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||||
bra x11
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||||
do10 tax
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||||
bra x10
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||||
do09 tax
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||||
bra x09
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||||
do08 tax
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||||
bra x08
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||||
do07 tax
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||||
bra x07
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||||
do06 tax
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||||
bra x06
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||||
do05 tax
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||||
bra x05
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||||
do04 tax
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||||
bra x04
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||||
do03 tax
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||||
bra x03
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||||
do02 tax
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||||
bra x02
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do01 tax
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bra x01
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||||
do16 tax
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||||
x16 lda $F000,x
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sta OPCODE_SAVE+$F000,y
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:x15 lda $E000,x
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x15 lda $E000,x
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sta OPCODE_SAVE+$E000,y
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||||
:x14 lda $D000,x
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||||
x14 lda $D000,x
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sta OPCODE_SAVE+$D000,y
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:x13 lda $C000,x
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||||
x13 lda $C000,x
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sta OPCODE_SAVE+$C000,y
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:x12 lda $B000,x
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||||
x12 lda $B000,x
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sta OPCODE_SAVE+$B000,y
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||||
:x11 lda $A000,x
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||||
x11 lda $A000,x
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||||
sta OPCODE_SAVE+$A000,y
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||||
:x10 lda $9000,x
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||||
x10 lda $9000,x
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||||
sta OPCODE_SAVE+$9000,y
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||||
:x09 lda $8000,x
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||||
x09 lda $8000,x
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||||
sta OPCODE_SAVE+$8000,y
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||||
:x08 lda $7000,x
|
||||
x08 lda $7000,x
|
||||
sta OPCODE_SAVE+$7000,y
|
||||
:x07 lda $6000,x
|
||||
x07 lda $6000,x
|
||||
sta OPCODE_SAVE+$6000,y
|
||||
:x06 lda $5000,x
|
||||
x06 lda $5000,x
|
||||
sta OPCODE_SAVE+$5000,y
|
||||
:x05 lda $4000,x
|
||||
x05 lda $4000,x
|
||||
sta OPCODE_SAVE+$4000,y
|
||||
:x04 lda $3000,x
|
||||
x04 lda $3000,x
|
||||
sta OPCODE_SAVE+$3000,y
|
||||
:x03 lda $2000,x
|
||||
x03 lda $2000,x
|
||||
sta OPCODE_SAVE+$2000,y
|
||||
:x02 lda $1000,x
|
||||
x02 lda $1000,x
|
||||
sta OPCODE_SAVE+$1000,y
|
||||
:x01 lda: $0000,x
|
||||
x01 lda: $0000,x
|
||||
sta: OPCODE_SAVE+$0000,y
|
||||
:bottom rts
|
||||
bottom
|
||||
<<<
|
||||
|
||||
; RestoreOpcode
|
||||
;
|
||||
|
|
@ -549,79 +539,79 @@ SaveOpcode
|
|||
; X = number of lines * 2, 0 to 32
|
||||
; Y = starting line * $1000
|
||||
; A = code field location * $1000
|
||||
RestoreOpcode
|
||||
jmp (:tbl,x)
|
||||
RestoreOpcode mac
|
||||
jmp (dispTbl,x)
|
||||
dispTbl da bottom
|
||||
da do01,do02,do03,do04
|
||||
da do05,do06,do07,do08
|
||||
da do09,do10,do11,do12
|
||||
da do13,do14,do15,do16
|
||||
|
||||
:tbl da :bottom
|
||||
da :do01,:do02,:do03,:do04
|
||||
da :do05,:do06,:do07,:do08
|
||||
da :do09,:do10,:do11,:do12
|
||||
da :do13,:do14,:do15,:do16
|
||||
|
||||
:do15 tax
|
||||
bra :x15
|
||||
:do14 tax
|
||||
bra :x14
|
||||
:do13 tax
|
||||
bra :x13
|
||||
:do12 tax
|
||||
bra :x12
|
||||
:do11 tax
|
||||
bra :x11
|
||||
:do10 tax
|
||||
bra :x10
|
||||
:do09 tax
|
||||
bra :x09
|
||||
:do08 tax
|
||||
bra :x08
|
||||
:do07 tax
|
||||
bra :x07
|
||||
:do06 tax
|
||||
bra :x06
|
||||
:do05 tax
|
||||
bra :x05
|
||||
:do04 tax
|
||||
bra :x04
|
||||
:do03 tax
|
||||
bra :x03
|
||||
:do02 tax
|
||||
bra :x02
|
||||
:do01 tax
|
||||
bra :x01
|
||||
:do16 tax
|
||||
:x16 lda OPCODE_SAVE+$F000,y
|
||||
do15 tax
|
||||
bra x15
|
||||
do14 tax
|
||||
bra x14
|
||||
do13 tax
|
||||
bra x13
|
||||
do12 tax
|
||||
bra x12
|
||||
do11 tax
|
||||
bra x11
|
||||
do10 tax
|
||||
bra x10
|
||||
do09 tax
|
||||
bra x09
|
||||
do08 tax
|
||||
bra x08
|
||||
do07 tax
|
||||
bra x07
|
||||
do06 tax
|
||||
bra x06
|
||||
do05 tax
|
||||
bra x05
|
||||
do04 tax
|
||||
bra x04
|
||||
do03 tax
|
||||
bra x03
|
||||
do02 tax
|
||||
bra x02
|
||||
do01 tax
|
||||
bra x01
|
||||
do16 tax
|
||||
x16 lda OPCODE_SAVE+$F000,y
|
||||
sta $F000,x
|
||||
:x15 lda OPCODE_SAVE+$E000,y
|
||||
x15 lda OPCODE_SAVE+$E000,y
|
||||
sta $E000,x
|
||||
:x14 lda OPCODE_SAVE+$D000,y
|
||||
x14 lda OPCODE_SAVE+$D000,y
|
||||
sta $D000,x
|
||||
:x13 lda OPCODE_SAVE+$C000,y
|
||||
x13 lda OPCODE_SAVE+$C000,y
|
||||
sta $C000,x
|
||||
:x12 lda OPCODE_SAVE+$B000,y
|
||||
x12 lda OPCODE_SAVE+$B000,y
|
||||
sta $B000,x
|
||||
:x11 lda OPCODE_SAVE+$A000,y
|
||||
x11 lda OPCODE_SAVE+$A000,y
|
||||
sta $A000,x
|
||||
:x10 lda OPCODE_SAVE+$9000,y
|
||||
x10 lda OPCODE_SAVE+$9000,y
|
||||
sta $9000,x
|
||||
:x09 lda OPCODE_SAVE+$8000,y
|
||||
x09 lda OPCODE_SAVE+$8000,y
|
||||
sta $8000,x
|
||||
:x08 lda OPCODE_SAVE+$7000,y
|
||||
x08 lda OPCODE_SAVE+$7000,y
|
||||
sta $7000,x
|
||||
:x07 lda OPCODE_SAVE+$6000,y
|
||||
x07 lda OPCODE_SAVE+$6000,y
|
||||
sta $6000,x
|
||||
:x06 lda OPCODE_SAVE+$5000,y
|
||||
x06 lda OPCODE_SAVE+$5000,y
|
||||
sta $5000,x
|
||||
:x05 lda OPCODE_SAVE+$4000,y
|
||||
x05 lda OPCODE_SAVE+$4000,y
|
||||
sta $4000,x
|
||||
:x04 lda OPCODE_SAVE+$3000,y
|
||||
x04 lda OPCODE_SAVE+$3000,y
|
||||
sta $3000,x
|
||||
:x03 lda OPCODE_SAVE+$2000,y
|
||||
x03 lda OPCODE_SAVE+$2000,y
|
||||
sta $2000,x
|
||||
:x02 lda OPCODE_SAVE+$1000,y
|
||||
x02 lda OPCODE_SAVE+$1000,y
|
||||
sta $1000,x
|
||||
:x01 lda: OPCODE_SAVE+$0000,y
|
||||
x01 lda: OPCODE_SAVE+$0000,y
|
||||
sta: $0000,x
|
||||
:bottom rts
|
||||
bottom
|
||||
<<<
|
||||
|
||||
; SetCodeEntry
|
||||
;
|
||||
|
|
@ -630,14 +620,14 @@ RestoreOpcode
|
|||
; X = number of lines * 2, 0 to 32
|
||||
; Y = starting line * $1000
|
||||
; A = address low byte
|
||||
SetCodeEntry
|
||||
jmp (:tbl,x)
|
||||
:tbl da :bottom-00,:bottom-03,:bottom-06,:bottom-09
|
||||
da :bottom-12,:bottom-15,:bottom-18,:bottom-21
|
||||
da :bottom-24,:bottom-27,:bottom-30,:bottom-33
|
||||
da :bottom-36,:bottom-39,:bottom-42,:bottom-45
|
||||
da :bottom-48
|
||||
:top sta CODE_ENTRY+$F000,y
|
||||
SetCodeEntry mac
|
||||
jmp (dispTbl,x)
|
||||
dispTbl da bottom-00,bottom-03,bottom-06,bottom-09
|
||||
da bottom-12,bottom-15,bottom-18,bottom-21
|
||||
da bottom-24,bottom-27,bottom-30,bottom-33
|
||||
da bottom-36,bottom-39,bottom-42,bottom-45
|
||||
da bottom-48
|
||||
sta CODE_ENTRY+$F000,y
|
||||
sta CODE_ENTRY+$E000,y
|
||||
sta CODE_ENTRY+$D000,y
|
||||
sta CODE_ENTRY+$C000,y
|
||||
|
|
@ -653,7 +643,8 @@ SetCodeEntry
|
|||
sta CODE_ENTRY+$2000,y
|
||||
sta CODE_ENTRY+$1000,y
|
||||
sta: CODE_ENTRY+$0000,y
|
||||
:bottom rts
|
||||
bottom
|
||||
<<<
|
||||
|
||||
; SetOddCodeEntry
|
||||
;
|
||||
|
|
@ -662,14 +653,14 @@ SetCodeEntry
|
|||
; X = number of lines * 2, 0 to 32
|
||||
; Y = starting line * $1000
|
||||
; A = address low byte
|
||||
SetOddCodeEntry
|
||||
jmp (:tbl,x)
|
||||
:tbl da :bottom-00,:bottom-03,:bottom-06,:bottom-09
|
||||
da :bottom-12,:bottom-15,:bottom-18,:bottom-21
|
||||
da :bottom-24,:bottom-27,:bottom-30,:bottom-33
|
||||
da :bottom-36,:bottom-39,:bottom-42,:bottom-45
|
||||
da :bottom-48
|
||||
:top sta ODD_ENTRY+$F000,y
|
||||
SetOddCodeEntry mac
|
||||
jmp (dispTbl,x)
|
||||
dispTbl da bottom-00,bottom-03,bottom-06,bottom-09
|
||||
da bottom-12,bottom-15,bottom-18,bottom-21
|
||||
da bottom-24,bottom-27,bottom-30,bottom-33
|
||||
da bottom-36,bottom-39,bottom-42,bottom-45
|
||||
da bottom-48
|
||||
sta ODD_ENTRY+$F000,y
|
||||
sta ODD_ENTRY+$E000,y
|
||||
sta ODD_ENTRY+$D000,y
|
||||
sta ODD_ENTRY+$C000,y
|
||||
|
|
@ -685,7 +676,8 @@ SetOddCodeEntry
|
|||
sta ODD_ENTRY+$2000,y
|
||||
sta ODD_ENTRY+$1000,y
|
||||
sta: ODD_ENTRY+$0000,y
|
||||
:bottom rts
|
||||
bottom
|
||||
<<<
|
||||
|
||||
; SetCodeEntryOpcode
|
||||
;
|
||||
|
|
@ -694,14 +686,14 @@ SetOddCodeEntry
|
|||
; X = number of lines * 2, 0 to 32
|
||||
; Y = starting line * $1000
|
||||
; A = opcode value
|
||||
SetCodeEntryOpcode
|
||||
jmp (:tbl,x)
|
||||
:tbl da :bottom-00,:bottom-03,:bottom-06,:bottom-09
|
||||
da :bottom-12,:bottom-15,:bottom-18,:bottom-21
|
||||
da :bottom-24,:bottom-27,:bottom-30,:bottom-33
|
||||
da :bottom-36,:bottom-39,:bottom-42,:bottom-45
|
||||
da :bottom-48
|
||||
:top sta CODE_ENTRY_OPCODE+$F000,y
|
||||
SetCodeEntryOpcode mac
|
||||
jmp (dispTbl,x)
|
||||
dispTbl da bottom-00,bottom-03,bottom-06,bottom-09
|
||||
da bottom-12,bottom-15,bottom-18,bottom-21
|
||||
da bottom-24,bottom-27,bottom-30,bottom-33
|
||||
da bottom-36,bottom-39,bottom-42,bottom-45
|
||||
da bottom-48
|
||||
sta CODE_ENTRY_OPCODE+$F000,y
|
||||
sta CODE_ENTRY_OPCODE+$E000,y
|
||||
sta CODE_ENTRY_OPCODE+$D000,y
|
||||
sta CODE_ENTRY_OPCODE+$C000,y
|
||||
|
|
@ -717,4 +709,5 @@ SetCodeEntryOpcode
|
|||
sta CODE_ENTRY_OPCODE+$2000,y
|
||||
sta CODE_ENTRY_OPCODE+$1000,y
|
||||
sta: CODE_ENTRY_OPCODE+$0000,y
|
||||
:bottom rts
|
||||
bottom
|
||||
<<<
|
||||
|
|
|
|||
|
|
@ -87,14 +87,14 @@ Counter equ tmp3
|
|||
; A = value
|
||||
;
|
||||
; Set M to 0 or 1
|
||||
SetConst ; Need a blank line here, otherwise the :tbl local variable resolveds backwards
|
||||
jmp (:tbl,x)
|
||||
:tbl da :bottom-00,:bottom-03,:bottom-06,:bottom-09
|
||||
da :bottom-12,:bottom-15,:bottom-18,:bottom-21
|
||||
da :bottom-24,:bottom-27,:bottom-30,:bottom-33
|
||||
da :bottom-36,:bottom-39,:bottom-42,:bottom-45
|
||||
da :bottom-48
|
||||
:top sta $F000,y
|
||||
SetConst mac
|
||||
jmp (dispTbl,x)
|
||||
dispTbl da bottom-00,bottom-03,bottom-06,bottom-09
|
||||
da bottom-12,bottom-15,bottom-18,bottom-21
|
||||
da bottom-24,bottom-27,bottom-30,bottom-33
|
||||
da bottom-36,bottom-39,bottom-42,bottom-45
|
||||
da bottom-48
|
||||
sta $F000,y
|
||||
sta $E000,y
|
||||
sta $D000,y
|
||||
sta $C000,y
|
||||
|
|
@ -110,7 +110,8 @@ SetConst ; Need a blank line here, ot
|
|||
sta $2000,y
|
||||
sta $1000,y
|
||||
sta: $0000,y
|
||||
:bottom rts
|
||||
bottom
|
||||
<<<
|
||||
|
||||
; SetDPAddrs
|
||||
;
|
||||
|
|
|
|||
|
|
@ -7,29 +7,36 @@
|
|||
; lines in the correct order
|
||||
_ApplyBG0YPos
|
||||
|
||||
:rtbl_idx equ tmp0
|
||||
:virt_line equ tmp1
|
||||
:lines_left equ tmp2
|
||||
:draw_count equ tmp3
|
||||
:rtbl_idx_x2 equ tmp0
|
||||
:virt_line_x2 equ tmp1
|
||||
:lines_left_x2 equ tmp2
|
||||
:draw_count_x2 equ tmp3
|
||||
:stk_save equ tmp4
|
||||
|
||||
; First task is to fill in the STK_ADDR values by copying them from the RTable array. We
|
||||
; copy from RTable[i] into BlitField[StartY+i]. As with all of this code, the difficult part
|
||||
; is decomposing the update across banks
|
||||
|
||||
stz :rtbl_idx ; Start copying from the first entry in the table
|
||||
stz :rtbl_idx_x2 ; Start copying from the first entry in the table
|
||||
|
||||
lda StartY ; This is the base line of the virtual screen
|
||||
jsr Mod208
|
||||
sta StartYMod208
|
||||
|
||||
sta :virt_line ; Keep track of it
|
||||
asl
|
||||
sta :virt_line_x2 ; Keep track of it
|
||||
|
||||
phb ; Save the current bank
|
||||
tsc ; we intentionally leak one byte of stack in each loop
|
||||
sta :stk_save ; iteration, so save the stack to repair at the end
|
||||
|
||||
; copy a range of address from the table into the destination bank. If we restrict ourselves to
|
||||
; rectangular playfields, this can be optimized to just subtracting a constant value. See the
|
||||
; Templates::SetScreenAddrs subroutine.
|
||||
|
||||
lda ScreenHeight
|
||||
sta :lines_left
|
||||
asl
|
||||
sta :lines_left_x2
|
||||
|
||||
; This is the verbose part -- figure out how many lines to draw. We don't want to artificially limit
|
||||
; the height of the visible screen (for example, doing an animated wipe while scrolling), so the screen
|
||||
|
|
@ -38,62 +45,46 @@ _ApplyBG0YPos
|
|||
; For larger values, we want to break things up on 16-line boundaries based on the virt_line value. So,
|
||||
;
|
||||
; draw_count = min(lines_left, (16 - (virt_line % 16))
|
||||
;
|
||||
; Note that almost everything in this loop can be done with 8-bit operations sincc the values are
|
||||
; all under 200. The one exception is the virt_line value which could exceed 256. This will be
|
||||
; a later optimization and might save around 10 cycles per iteration, or up to ~120 cycles per frame
|
||||
; and ~2,500 per secord. This is ~1% of our total CPU budget and is *just* enough cycles to be
|
||||
; interesting.... Another 8 cycles could be removed by doing all calculatinos pre-multiplied by 2
|
||||
; to avoid several 'asl' instructions
|
||||
phb
|
||||
|
||||
:loop
|
||||
lda :virt_line
|
||||
asl
|
||||
tax
|
||||
ldx :virt_line_x2
|
||||
ldal BTableLow,x ; Get the address of the first code field line
|
||||
tay
|
||||
|
||||
sep #$20
|
||||
ldal BTableHigh,x
|
||||
ldal BTableHigh,x ; Target bank in low byte, current bank in high
|
||||
pha
|
||||
plb ; This is the bank that will receive the updates
|
||||
rep #$20
|
||||
|
||||
lda :virt_line
|
||||
and #$000F
|
||||
txa
|
||||
and #$001E
|
||||
eor #$FFFF
|
||||
inc
|
||||
clc
|
||||
adc #16
|
||||
min :lines_left
|
||||
sec
|
||||
adc #32
|
||||
min :lines_left_x2
|
||||
|
||||
sta :draw_count ; Do this many lines
|
||||
asl
|
||||
sta :draw_count_x2 ; Do this many lines
|
||||
tax
|
||||
|
||||
lda :rtbl_idx ; Read from this location in the RTable
|
||||
asl
|
||||
clc ; pre-advance virt_line_2 because we have the value
|
||||
adc :virt_line_x2
|
||||
sta :virt_line_x2
|
||||
|
||||
jsr CopyRTableToStkAddr
|
||||
plb
|
||||
CopyRTableToStkAddr :rtbl_idx_x2 ; X = rtbl_idx_x2 on return
|
||||
|
||||
lda :virt_line ; advance to the virtual line after the segment we just
|
||||
clc ; filled in
|
||||
adc :draw_count
|
||||
sta :virt_line
|
||||
txa ; carry flag is unchanged
|
||||
adc :draw_count_x2 ; advance the index into the RTable
|
||||
sta :rtbl_idx_x2
|
||||
|
||||
lda :rtbl_idx ; advance the index into the RTable
|
||||
adc :draw_count
|
||||
sta :rtbl_idx
|
||||
|
||||
lda :lines_left ; subtract the number of lines we just completed
|
||||
lda :lines_left_x2 ; subtract the number of lines we just completed
|
||||
sec
|
||||
sbc :draw_count
|
||||
sta :lines_left
|
||||
sbc :draw_count_x2
|
||||
sta :lines_left_x2
|
||||
|
||||
jne :loop
|
||||
plb
|
||||
|
||||
:out
|
||||
lda :stk_save
|
||||
tcs
|
||||
plb
|
||||
rts
|
||||
|
||||
; Unrolled copy routine to move RTable intries into STK_ADDR position.
|
||||
|
|
@ -101,74 +92,75 @@ _ApplyBG0YPos
|
|||
; A = intect into the RTable array (x2)
|
||||
; Y = starting line * $1000
|
||||
; X = number of lines (x2)
|
||||
CopyRTableToStkAddr
|
||||
jmp (:tbl,x)
|
||||
:tbl da :none
|
||||
da :do01,:do02,:do03,:do04
|
||||
da :do05,:do06,:do07,:do08
|
||||
da :do09,:do10,:do11,:do12
|
||||
da :do13,:do14,:do15,:do16
|
||||
:do15 tax
|
||||
bra :x15
|
||||
:do14 tax
|
||||
bra :x14
|
||||
:do13 tax
|
||||
bra :x13
|
||||
:do12 tax
|
||||
bra :x12
|
||||
:do11 tax
|
||||
bra :x11
|
||||
:do10 tax
|
||||
bra :x10
|
||||
:do09 tax
|
||||
bra :x09
|
||||
:do08 tax
|
||||
bra :x08
|
||||
:do07 tax
|
||||
bra :x07
|
||||
:do06 tax
|
||||
bra :x06
|
||||
:do05 tax
|
||||
bra :x05
|
||||
:do04 tax
|
||||
bra :x04
|
||||
:do03 tax
|
||||
bra :x03
|
||||
:do02 tax
|
||||
bra :x02
|
||||
:do01 tax
|
||||
bra :x01
|
||||
:do16 tax
|
||||
CopyRTableToStkAddr mac
|
||||
jmp (dispTbl,x)
|
||||
dispTbl da bottom
|
||||
da do01,do02,do03,do04
|
||||
da do05,do06,do07,do08
|
||||
da do09,do10,do11,do12
|
||||
da do13,do14,do15,do16
|
||||
do15 ldx ]1
|
||||
bra x15
|
||||
do14 ldx ]1
|
||||
bra x14
|
||||
do13 ldx ]1
|
||||
bra x13
|
||||
do12 ldx ]1
|
||||
bra x12
|
||||
do11 ldx ]1
|
||||
bra x11
|
||||
do10 ldx ]1
|
||||
bra x10
|
||||
do09 ldx ]1
|
||||
bra x09
|
||||
do08 ldx ]1
|
||||
bra x08
|
||||
do07 ldx ]1
|
||||
bra x07
|
||||
do06 ldx ]1
|
||||
bra x06
|
||||
do05 ldx ]1
|
||||
bra x05
|
||||
do04 ldx ]1
|
||||
bra x04
|
||||
do03 ldx ]1
|
||||
bra x03
|
||||
do02 ldx ]1
|
||||
bra x02
|
||||
do01 ldx ]1
|
||||
bra x01
|
||||
do16 ldx ]1
|
||||
ldal RTable+30,x
|
||||
sta STK_ADDR+$F000,y
|
||||
:x15 ldal RTable+28,x
|
||||
x15 ldal RTable+28,x
|
||||
sta STK_ADDR+$E000,y
|
||||
:x14 ldal RTable+26,x
|
||||
x14 ldal RTable+26,x
|
||||
sta STK_ADDR+$D000,y
|
||||
:x13 ldal RTable+24,x
|
||||
x13 ldal RTable+24,x
|
||||
sta STK_ADDR+$C000,y
|
||||
:x12 ldal RTable+22,x
|
||||
x12 ldal RTable+22,x
|
||||
sta STK_ADDR+$B000,y
|
||||
:x11 ldal RTable+20,x
|
||||
x11 ldal RTable+20,x
|
||||
sta STK_ADDR+$A000,y
|
||||
:x10 ldal RTable+18,x
|
||||
x10 ldal RTable+18,x
|
||||
sta STK_ADDR+$9000,y
|
||||
:x09 ldal RTable+16,x
|
||||
x09 ldal RTable+16,x
|
||||
sta STK_ADDR+$8000,y
|
||||
:x08 ldal RTable+14,x
|
||||
x08 ldal RTable+14,x
|
||||
sta STK_ADDR+$7000,y
|
||||
:x07 ldal RTable+12,x
|
||||
x07 ldal RTable+12,x
|
||||
sta STK_ADDR+$6000,y
|
||||
:x06 ldal RTable+10,x
|
||||
x06 ldal RTable+10,x
|
||||
sta STK_ADDR+$5000,y
|
||||
:x05 ldal RTable+08,x
|
||||
x05 ldal RTable+08,x
|
||||
sta STK_ADDR+$4000,y
|
||||
:x04 ldal RTable+06,x
|
||||
x04 ldal RTable+06,x
|
||||
sta STK_ADDR+$3000,y
|
||||
:x03 ldal RTable+04,x
|
||||
x03 ldal RTable+04,x
|
||||
sta STK_ADDR+$2000,y
|
||||
:x02 ldal RTable+02,x
|
||||
x02 ldal RTable+02,x
|
||||
sta STK_ADDR+$1000,y
|
||||
:x01 ldal RTable+00,x
|
||||
x01 ldal RTable+00,x
|
||||
sta: STK_ADDR+$0000,y
|
||||
:none rts
|
||||
bottom
|
||||
<<<
|
||||
Loading…
Reference in New Issue