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Aminet 2
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Aminet AMIGA CDROM (1994)(Walnut Creek)[Feb 1994][W.O. 44790-1].iso
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gfx
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3d
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Real_Developer.lha
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Source
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hr_r3d.library.asm
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Assembly Source File
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1992-07-22
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10KB
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410 lines
;-----------------------------------------------------------------------
; This file contains library handling routines and entry functions,
; which push arguments into stack and call the actual C language routines
; contained in the file hrcode.c. If you want to use this example when
; creating a new interface library, change the library name strings to
; match the new library name and reassemble the file:
;
; 'asm hr_r3d.library.asm'
SECTION code
NOLIST
INCLUDE "exec/types.i"
INCLUDE "exec/initializers.i"
INCLUDE "exec/libraries.i"
INCLUDE "exec/lists.i"
INCLUDE "exec/alerts.i"
INCLUDE "exec/resident.i"
INCLUDE "libraries/dos.i"
INCLUDE "asmsupp.i"
INCLUDE "dspdrvbase.i"
LIST
;------ These don't have to be external, but it helps some
;------ debuggers to have them globally visible
XDEF Init
XDEF Open
XDEF Close
XDEF Expunge
XDEF Null
XDEF libraryName
XREF _R3DInitDspDrv
XREF _R3DFreeDspDrv
XREF _R3DSetMode
XREF _R3DGetSize
XREF _R3DWriteLine
XREF _R3DReadLine
XREF _R3DClsScr
XREF _R3DCustomSave
XREF _AbsExecBase
XREF _R3DDspDrvBase
XLIB OpenLibrary
XLIB CloseLibrary
XLIB Alert
XLIB FreeMem
XLIB Remove
; The first executable location. This should return an error
; in case someone tried to run you as a program (instead of
; loading you as a library).
Start:
MOVEQ #-1,d0
rts
;-----------------------------------------------------------------------
; A romtag structure. Both "exec" and "ramlib" look for
; this structure to discover magic constants about you
; (such as where to start running you from...).
;-----------------------------------------------------------------------
; Most people will not need a priority and should leave it at zero.
; the RT_PRI field is used for configuring the roms. Use "mods" from
; wack to look at the other romtags in the system
MYPRI EQU 0
initDDescrip:
;STRUCTURE RT,0
DC.W RTC_MATCHWORD ; UWORD RT_MATCHWORD
DC.L initDDescrip ; APTR RT_MATCHTAG
DC.L EndCode ; APTR RT_ENDSKIP
DC.B RTF_AUTOINIT ; UBYTE RT_FLAGS
DC.B VERSION ; UBYTE RT_VERSION
DC.B NT_LIBRARY ; UBYTE RT_TYPE
DC.B MYPRI ; BYTE RT_PRI
DC.L libraryName ; APTR RT_NAME
DC.L idString ; APTR RT_IDSTRING
DC.L Init ; APTR RT_INIT
; this is the name that the library will have
libraryName: dc.b 'hr_r3d.library',0
; a major version number.
VERSION: EQU 34
; A particular revision. This should uniquely identify the bits in the
; library. I use a script that advances the revision number each time
; I recompile. That way there is never a question of which library
; that really is.
REVISION: EQU 1
; this is an identifier tag to help in supporting the library
; format is 'name version.revision (dd MON yyyy)',<cr>,<lf>,<null>
idString: dc.b 'hr_r3d.library 1.0 (10 Jan 1992)',13,10,0
dosName: DOSNAME
; force word alignment
ds.w 0
; The romtag specified that we were "RTF_AUTOINIT". This means
; that the RT_INIT structure member points to one of these
; tables below. If the AUTOINIT bit was not set then RT_INIT
; would point to a routine to run.
Init:
DC.L R3DDspDrvBase_SIZEOF ; size of library base data space
DC.L funcTable ; pointer to function initializers
DC.L dataTable ; pointer to data initializers
DC.L initRoutine ; routine to run
funcTable:
;------ standard system routines
dc.l Open
dc.l Close
dc.l Expunge
dc.l Null
;------ my library functions
dc.l R3DInitDspDrv
dc.l R3DFreeDspDrv
dc.l R3DSetMode
dc.l R3DGetSize
dc.l R3DWriteLine
dc.l R3DReadLine
dc.l R3DClsScr
dc.l R3DCustomSave
;------ function table end marker
dc.l -1
; The data table initializes static data structures.
; The format is specified in exec/InitStruct routine's
; manual pages. The INITBYTE/INITWORD/INITLONG routines
; are in the file "exec/initializers.i". The first argument
; is the offset from the library base for this byte/word/long.
; The second argument is the value to put in that cell.
; The table is null terminated
dataTable:
INITBYTE LN_TYPE,NT_LIBRARY
INITLONG LN_NAME,libraryName
INITBYTE LIB_FLAGS,LIBF_SUMUSED!LIBF_CHANGED
INITWORD LIB_VERSION,VERSION
INITWORD LIB_REVISION,REVISION
INITLONG LIB_IDSTRING,idString
DC.L 0
; This routine gets called after the library has been allocated.
; The library pointer is in D0. The segment list is in A0.
; If it returns non-zero then the library will be linked into
; the library list.
initRoutine:
;------ get the library pointer into a convenient A register
move.l a5,-(sp)
move.l d0,a5
move.l d0,_R3DDspDrvBase
;------ save a pointer to exec
move.l a6,sb_SysLib(a5)
;------ save a pointer to our loaded code
move.l a0,sb_SegList(a5)
;------ open the dos library
lea dosName(pc),a1
CLEAR d0
CALLSYS OpenLibrary
move.l d0,sb_DosLib(a5)
bne.s 1$
;------ can't open the dos! what gives
ALERT AG_OpenLib!AO_DOSLib
1$:
;------ now build the static data that we need
;
; put your initialization here...
;
move.l a5,d0
move.l (sp)+,a5
rts
;----------------------------------------------------------------------
;
; here begins the system interface commands. When the user calls
; OpenLibrary/CloseLibrary/RemoveLibrary, this eventually gets translated
; into a call to the following routines (Open/Close/Expunge). Exec
; has already put our library pointer in A6 for us. Exec has turned
; off task switching while in these routines (via Forbid/Permit), so
; we should not take too long in them.
;
;----------------------------------------------------------------------
; Open returns the library pointer in d0 if the open
; was successful. If the open failed then null is returned.
; It might fail if we allocated memory on each open, or
; if only open application could have the library open
; at a time...
Open: ; ( libptr:a6, version:d0 )
;------ mark us as having another opener
addq.w #1,LIB_OPENCNT(a6)
;------ prevent delayed expunges
bclr #LIBB_DELEXP,sb_Flags(a6)
move.l a6,d0
rts
; There are two different things that might be returned from
; the Close routine. If the library is no longer open and
; there is a delayed expunge then Close should return the
; segment list (as given to Init). Otherwise close should
; return NULL.
Close: ; ( libptr:a6 )
;------ set the return value
CLEAR d0
;------ mark us as having one fewer openers
subq.w #1,LIB_OPENCNT(a6)
;------ see if there is anyone left with us open
bne.s 1$
;------ see if we have a delayed expunge pending
btst #LIBB_DELEXP,sb_Flags(a6)
beq.s 1$
;------ do the expunge
bsr Expunge
1$:
rts
; There are two different things that might be returned from
; the Expunge routine. If the library is no longer open
; then Expunge should return the segment list (as given to
; Init). Otherwise Expunge should set the delayed expunge
; flag and return NULL.
;
; One other important note: because Expunge is called from
; the memory allocator, it may NEVER Wait() or otherwise
; take long time to complete.
Expunge: ; ( libptr: a6 )
movem.l d2/a5/a6,-(sp)
move.l a6,a5
move.l sb_SysLib(a5),a6
;------ see if anyone has us open
tst.w LIB_OPENCNT(a5)
beq 1$
;------ it is still open. set the delayed expunge flag
bset #LIBB_DELEXP,sb_Flags(a5)
CLEAR d0
bra.s Expunge_End
1$:
;------ go ahead and get rid of us. Store our seglist in d2
move.l sb_SegList(a5),d2
;------ unlink from library list
move.l a5,a1
CALLSYS Remove
;
; device specific closings here...
;
;------ close the dos library
move.l sb_DosLib(a5),a1
CALLSYS CloseLibrary
;------ free our memory
CLEAR d0
move.l a5,a1
move.w LIB_NEGSIZE(a5),d0
sub.l d0,a1
add.w LIB_POSSIZE(a5),d0
CALLSYS FreeMem
;------ set up our return value
move.l d2,d0
Expunge_End:
movem.l (sp)+,d2/a5/a6
rts
Null:
CLEAR d0
rts
;----------------------------------------------------------------------
; Here begins the library functions.
;
; These simple assembler functions are only entries to actual functions
; written in C and contained in the C module hrcode.c. The purpose of these
; entry functions is to push the arguments into stack and then call C code.
;
;----------------------------------------------------------------------
*----- R3DInitDspDrv( )
R3DInitDspDrv:
jsr _R3DInitDspDrv
rts
*----- R3DFreeDspDrv(a0)
R3DFreeDspDrv:
move.l a0,-(sp)
jsr _R3DFreeDspDrv
addq #4,sp
rts
*----- R3DSetMode(a0)
R3DSetMode:
move.l a0,-(sp)
jsr _R3DSetMode
addq #4,sp
rts
*----- R3DGetSize(a0,a1,d0)
R3DGetSize:
move.l d0,-(sp)
move.l a1,-(sp)
move.l a0,-(sp)
jsr _R3DGetSize
addq #8,sp
addq #4,sp
rts
*----- R3DWriteLine(a0,a1,a2,d0,d1)
R3DWriteLine:
move.l d1,-(sp)
move.l d0,-(sp)
move.l a2,-(sp)
move.l a1,-(sp)
move.l a0,-(sp)
jsr _R3DWriteLine
addq #8,sp
addq #8,sp
addq #4,sp
rts
*----- R3DReadLine(a0,a1,a2,d0,d1)
R3DReadLine:
move.l d1,-(sp)
move.l d0,-(sp)
move.l a2,-(sp)
move.l a1,-(sp)
move.l a0,-(sp)
jsr _R3DReadLine
addq #8,sp
addq #8,sp
addq #4,sp
rts
*----- R3DClsScr(a0,a1)
R3DClsScr:
move.l a1,-(sp)
move.l a0,-(sp)
jsr _R3DClsScr
addq #8,sp
rts
*----- R3DCustomSave(a0,a1,a2,d0,d1,d2)
R3DCustomSave:
move.l d2,-(sp)
move.l d1,-(sp)
move.l d0,-(sp)
move.l a2,-(sp)
move.l a1,-(sp)
move.l a0,-(sp)
jsr _R3DCustomSave
addq #8,sp
addq #8,sp
addq #8,sp
rts
EndCode:
END