mirror of
https://github.com/thornAvery/jep-hack.git
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77 lines
2.4 KiB
NASM
77 lines
2.4 KiB
NASM
DEF ___current_indirect_size = 0
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; usage:
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; Table:
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; indirect_table <entry size>, <start index> (0-1)
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; indirect_entries <max index>, <optional far label>
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; (repeat as many times as necessary)
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; indirect_table_end
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MACRO indirect_table
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; arguments: entry size, initial index (0 or 1)
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assert ((\2) * (\2)) == (\2), \
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"indirect table error: invalid initial index (must be 0 or 1)"
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assert !___current_indirect_size, \
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"indirect table error: there's already an active indirect table"
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assert (\1) > 0, \
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"indirect table error: the entry size must be positive"
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assert (\1) <= $7FFF, \
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"indirect table error: entry size is set to an invalid value"
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DEF ___current_indirect_index = \2
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DEF ___current_indirect_size = \1
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dw (\1) | ((\2) << 15)
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ENDM
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MACRO indirect_entries
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; arguments: next max index, far label (omit for zero/no data), far bank (if different from label)
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assert ___current_indirect_size != 0, \
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"indirect table error: there's no active indirect table"
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assert (\1) >= ___current_indirect_index, \
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"indirect table error: attempted to move backwards"
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DEF ___current_indirect_count = (\1) + 1 - ___current_indirect_index
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DEF ___current_indirect_index = (\1) + 1
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DEF ___current_indirect_iteration_limit = ___current_indirect_count / $FF
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DEF ___current_indirect_count = ___current_indirect_count % $FF
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DEF ___current_indirect_count_total = ((___current_indirect_iteration_limit * $FF) + ___current_indirect_count)
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if _NARG > 1
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assert (\2.IndirectEnd - \2) == ___current_indirect_size * ___current_indirect_count_total, \
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"\2: expected {d:___current_indirect_count_total} entries, each {d:___current_indirect_size} bytes"
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endc
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if ___current_indirect_iteration_limit
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FOR ___current_indirect_iteration, ___current_indirect_iteration_limit
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db $FF
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if _NARG == 1
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db 0, 0, 0
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else
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if _NARG == 2
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db BANK(\2)
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else
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db \3
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endc
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dw (\2) + $FF * ___current_indirect_size * ___current_indirect_iteration
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endc
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endr
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endc
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if ___current_indirect_count
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db ___current_indirect_count
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if _NARG == 1
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db 0, 0, 0
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else
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if _NARG == 2
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db BANK(\2)
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else
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db \3
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endc
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dw (\2) + $FF * ___current_indirect_size * ___current_indirect_iteration_limit
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endc
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endc
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ENDM
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MACRO indirect_table_end
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; no arguments
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assert ___current_indirect_size != 0, \
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"indirect table error: there's no active indirect table"
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db 0
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DEF ___current_indirect_size = 0
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ENDM
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