Apple-2gs-SW/iigs-game-engine
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Fix relative offset from interrupt enable code and fix order bug in exit code path

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This commit is contained in:
Lucas Scharenbroich 2023-06-27 21:32:21 -05:00
parent 4645929596
commit cdfc414a9f
1 changed files with 4 additions and 14 deletions
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18
src/blitter/TemplateLite.s
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@ -5,18 +5,7 @@ blt_return_lite EXT
mx %00
LITE_STK_ADDR equ lite_entry_1-lite_base+1 ; offset to patch in the stack (SHR) right edge address
LITE_LYR_ENTRY equ lite_entry_1-lite_base
LITE_CODE_ENTRY_OPCODE equ lite_entry_jmp-lite_base
LITE_CODE_ENTRY equ lite_entry_jmp-lite_base+1 ; low byte of the page-aligned jump address
LITE_ODD_ENTRY equ lite_odd_entry-lite_base+1
LITE_CODE_LEN equ lite_top-lite_base
LITE_CODE_EXIT equ lite_even_exit-lite_base
LITE_OPCODE_SAVE equ lite_odd_low_save-lite_base ; spot to save the code field opcode when patching exit BRA
LITE_OPCODE_HIGH_SAVE equ lite_odd_high_save-lite_base ; save the third byte only
LITE_ENABLE_INT equ lite_enable_int-lite_base ; offset that re-enable interrupts and continues
REL_BRA equ $E0 ; pre-calculated branch back from the interrupt enabler
; Return to caller -- this is the target address to patch in the JMP instruction on the last rendered line. We
; put it at the beginning so the rest of the bank can be replicated line templates.
@ -82,6 +71,7 @@ lite_even_exit jmp *+5 ; Jump to the next line.
lup 206
ldx #0000
txs
dfb $82,$00,$00
lda: *+1,x
pha
@ -96,10 +86,10 @@ lite_even_exit jmp *+5 ; Jump to the next line.
lda STATE_REG_BLIT
stal STATE_REG
; bra *-34
dfb $80,$E0
dfb $80,REL_BRA
jmp _LINE_BASE+{_LINE_SIZE*]line}+_EXIT_EVEN
jmp _LINE_BASE+{_LINE_SIZE*]line}+_EXIT_ODD
jmp _LINE_BASE+{_LINE_SIZE*]line}+_EXIT_EVEN
pea $0000
pea $0000