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89 lines
2.9 KiB
Plaintext
89 lines
2.9 KiB
Plaintext
;license:MIT
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;(c) 2018-9 by 4am & qkumba
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;
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; ProRWTS2 glue functions
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;
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; Public functions
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; - LoadFile
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; - LoadDHRFile
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;
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; Public variables
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; - gRootDirectory
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;
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; A general note about paths:
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;
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; LoadFile, LoadDHRFile, and SaveSmallFile support subdirectories.
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; Directories are delimited by '/' like ProDOS. At program startup, we get the
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; current directory and save it; that is the PROGRAM ROOT DIRECTORY. All
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; pathnames are relative to the PROGRAM ROOT DIRECTORY. There is no concept of
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; setting or changing the 'current' directory.
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;
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; The PROGRAM ROOT DIRECTORY is not guaranteed to be the root directory of the
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; underlying ProDOS disk (although it can be). But it doesn't matter, because
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; these functions provide no access to any directory above the PROGRAM ROOT
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; DIRECTORY. You can't use '..' to access the parent directory, and you can't
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; start a pathname with '/' to access the root directory of the underlying
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; ProDOS disk.
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;
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; Examples:
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; 'PREFS.CONF' points to a file named 'PREFS.CONF' in the PROGRAM ROOT
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; DIRECTORY.
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;
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; 'FX/RIPPLE' points to a file named 'RIPPLE' in a directory named 'FX' in the
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; PROGRAM ROOT DIRECTORY.
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;------------------------------------------------------------------------------
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; LoadFile
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; Load a file into memory all at once, using ProRWTS2
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;
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; supports paths, see note
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;
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; in: stack contains 6 bytes of parameters:
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; +1 [word] address of length-prefixed pathname
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; +3 [word] address of length-prefixed filename
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; +5 [word] address to load file, or 0 to use file's default address
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; out: all flags clobbered
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; all registers clobbered
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; gPathname clobbered
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;------------------------------------------------------------------------------
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LoadFile
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+PARAMS_ON_STACK 6
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+LDPARAM 1
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jsr SetPath
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+LDPARAM 3
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jsr AddToPath
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+LDPARAM 5
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+STAY ldrlo ; set load address
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jsr SwitchToBank2
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jsr LoadFileInternal
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jmp SwitchToBank1
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;------------------------------------------------------------------------------
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; LoadDHRFile
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; load .A2FC file (uncompressed double hi-res graphics) into memory
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; all at once, using ProRWTS2
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; first $2000 bytes of file are loaded into auxiliary memory $4000..$5FFF
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; second $2000 bytes of file are loaded into main memory $4000..$4FFF
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;
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; supports paths, see note
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;
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; in: stack contains 4 bytes of parameters:
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; +1 [word] address of length-prefixed pathname
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; +3 [word] address of length-prefixed filename
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; out: all flags clobbered
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; all registers clobbered
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; stack set to next instruction after parameters
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;------------------------------------------------------------------------------
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LoadDHRFile
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+PARAMS_ON_STACK 4
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+LDPARAM 1
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jsr SetPath
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+LDPARAM 3
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jsr AddToPath
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jsr SwitchToBank2
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jsr LoadDHRFileInternal
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jmp SwitchToBank1
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gRootDirectory
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!word $FDFD
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