CW PROG5.S
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;---------------------------------------------------------------------
; THE ST ASSEMBLY LANGUAGE WORKSHOP, VOLUME 2
; PROGRAM 5
;
; COPYRIGHT 1992 BY CLAYTON WALNUM
;---------------------------------------------------------------------
CCONIN equ 1
PTERM0 equ 0
MSHRINK equ 74
V_CLRWK equ 3
V_PLINE equ 6
VSL_TYPE equ 15
VSL_WIDTH equ 16
VSL_COLOR equ 17
V_OPNVWK equ 100
V_CLSVWK equ 101
VSL_ENDS equ 108
AES_OPCODE equ 200
VDI_OPCODE equ 115
;--------------------------------------------------------------------
; MACROS
;--------------------------------------------------------------------
;--------------------------------------------------------------------
; This macro gets a single character from the keyboard, using the
; Cconin GEMDOS function.
;--------------------------------------------------------------------
get_char macro
move #CCONIN,-(sp)
trap #1
addq.l #2,sp
endm
;--------------------------------------------------------------------
; MAIN PROGRAM
;--------------------------------------------------------------------
text
; Calculate the size of the program area.
move.l a7,a5 ; Save addr of TPA.
lea stack,sp ; Load addr of our stack.
move.l 4(a5),a5 ; Get addr of TPA.
move.l 12(a5),d0 ; Get len of text segment.
add.l 20(a5),d0 ; Add len of data segment.
add.l 28(a5),d0 ; Add len of BSS segment.
add.l #$100,d0 ; Add len of TPA.
; Release unused memory back to the system.
move.l d0,-(sp) ; Push size of program on stack.
move.l a5,-(sp) ; Push program addr on stack.
clr -(sp) ; Clear dummy word on stack.
move #MSHRINK,-(sp) ; Push Mshrink opcode.
trap #1 ; Call GEMDOS.
add.l #12,sp ; Reset stack pointer.
; Clear some fields of the global array.
clr.l ap_ptree
clr.l ap_1resv
clr.l ap_2resv
clr.l ap_3resv
clr.l ap_4resv
; Call appl_init to initialize application.
move.l #appl_init,apb
bsr aes
cmpi #$FFFF,ap_id ; Error?
beq end ; Yep. Outta here.
; Get handle to screen device.
move.l #graf_handle,apb
jsr aes
move int_out,gr_handle ; Save screen device handle.
; Open virtual workstation.
move #V_OPNVWK,contrl ; v_opnvwk opcode.
clr contrl+2 ; # of points in pts_in.
move #11,contrl+6 ; # of ints in int_in.
move gr_handle,contrl+12 ; Screen device handle.
movea.l #int_in,a5 ; Get address of int_in.
move #9,d5 ; Init loop counter.
loop:
move #1,(a5)+ ; Place 1 in element of int_in.
dbra d5,loop ; Go init next element of int_in.
move #2,int_in+20 ; Set for raster coordinates.
jsr vdi
move contrl+12,vws_handle ; Save virtual workstation handle.
; Clear workstation.
move #V_CLRWK,contrl ; v_clrwk opcode.
clr contrl+2 ; # of points in pts_in.
clr contrl+6 ; # of ints in int_in.
jsr vdi
move #3,d5 ; Init loop counter.
polyline:
; Set line color.
move #VSL_COLOR,contrl ; vsl_color opcode.
clr contrl+2 ; # of points in pts_in.
move #1,contrl+6 ; # of ints in int_in.
move color,int_in ; New line color.
jsr vdi
addq #1,color
; Set line ends.
move #VSL_ENDS,contrl ; vsl_ends opcode.
clr contrl+2 ; # points in pts_in.
move #2,contrl+6 ; # ints in int_in.
move ends,int_in ; End style for start of line.
move ends,int_in+2 ; End style for end of line.
jsr vdi
addq #1,ends
; Set line width.
move #VSL_WIDTH,contrl ; vsl_width opcode.
move #1,contrl+2 ; # points in pts_in.
clr contrl+6 ; # of ints in int_in.
move width,pts_in ; New line width.
clr pts_in+2
jsr vdi
addq #2,width ; calculate next line width.
; Draw polyline.
move #V_PLINE,contrl ; v_pline opcode.
move #2,contrl+2 ; # of points in pts_in.
clr contrl+6 ; # of ints in int_in.
move #30,pts_in ; X coord of first point.
move y1,pts_in+2 ; Y coord of first point.
move #280,pts_in+4 ; X coord of second point.
move y2,pts_in+6 ; Y coord of second point.
jsr vdi
add #10,y1 ; Calculate next Y coords.
add #10,y2
dbra d5,polyline ; Go draw next line.
; Reset line widths.
move #VSL_WIDTH,contrl ; vsl_width opcode.
move #1,contrl+2 ; # of points in pts_in.
clr contrl+6 ; # of ints in int_in.
move #1,pts_in ; New line width.
clr pts_in+2
jsr vdi
; Reset line ends.
move #VSL_ENDS,contrl ; vsl_ends opcode.
clr contrl+2 ; # of points in pts_in.
move #2,contrl+6 ; # of ints in int_in.
move #0,int_in ; End style for start of line.
move #0,int_in+2 ; End style for end of line.
jsr vdi
move #5,d5 ; Init loop counter.
polyline2:
; Set line type.
move #VSL_TYPE,contrl ; vsl_type opcode.
clr contrl+2 ; # of points in pts_in.
move #1,contrl+6 ; # of ints in int_in.
move type,int_in ; Line pattern type.
jsr vdi
addq #1,type ; Calculate next line type.
; Draw polyline.
move #V_PLINE,contrl ; v_pline opcode.
move #2,contrl+2 ; # of points in pts_in.
clr contrl+6 ; # of ints in int_in.
move #30,pts_in ; X coord of first point.
move y1,pts_in+2 ; Y coord of first point.
move #280,pts_in+4 ; X coord of second point.
move y2,pts_in+6 ; Y coord of second point.
jsr vdi
add #10,y1 ; Calculate next Y coords.
add #10,y2
dbra d5,polyline2 ; Go draw another line.
get_char
; Close the virtual workstation.
move #V_CLSVWK,contrl ; v_clsvwk opcode.
clr contrl+2 ; # of points in pts_in.
clr contrl+6 ; # of ints in int_in.
jsr vdi
; Close down application.
exit:
move.l #appl_exit,apb ; appl_exit control array.
bsr aes
end:
move.w #PTERM0,-(sp) ; Back to desktop.
trap #1
;--------------------------------------------------------------------
; This subroutine calls the AES. Before calling this subroutine, the
; program must have correctly initialized the AES control, int_in,
; and addr_in arrays.
;
; Input: Appropriate values in the int_in, addr_in, and
; control arrays.
; Output: Appropriate values in the int_out, addr_out, and
; global arrays.
; Regs changed: NONE
; Uses: apb, global, int_in, int_out, addr_in, addr_out
;--------------------------------------------------------------------
aes:
movem.l a0-a7/d0-d7,-(sp) ; Save registers.
move.l #apb,d1 ; Load addr of apb.
move.w #AES_OPCODE,d0 ; Load AES opcode.
trap #2 ; Call AES.
movem.l (sp)+,a0-a7/d0-d7 ; Restore registers.
rts
;--------------------------------------------------------------------
; This subroutine calls the VDI. Before calling this subroutine, the
; program must have correctly initialized the VDI contrl, intin,
; and ptsin arrays.
;
; Input: Appropriate values in the intin, ptsin, and
; contrl arrays.
; Output: Appropriate values in the intout and ptsout arrays.
; Regs changed: NONE
; Uses: vpb, intin, intout, ptsin, ptsout
;--------------------------------------------------------------------
vdi:
movem.l a0-a7/d0-d7,-(sp) ; Save registers.
move.l #vpb,d1 ; Load addr of vpb.
move.w #VDI_OPCODE,d0 ; Load VDI opcode.
trap #2 ; Call VDI.
movem.l (sp)+,a0-a7/d0-d7 ; Restore registers.
rts
data
even
y1: dc.w 20
y2: dc.w 20
color: dc.w 1
type: dc.w 1
width: dc.w 1
ends: dc.w 0
apb: dc.l 0,global,int_in,int_out,addr_in,addr_out
vpb: dc.l contrl,int_in,pts_in,int_out,pts_out
appl_init: dc.w 10,0,1,0,0
appl_exit: dc.w 19,0,1,0,0
graf_handle: dc.w 77,0,5,0,0
bss
even
gr_handle: ds.w 1
vws_handle: ds.w 1
global:
ap_version: ds.w 1
ap_count: ds.w 1
ap_id: ds.w 1
ap_private: ds.l 1
ap_ptree: ds.l 1
ap_1resv: ds.l 1
ap_2resv: ds.l 1
ap_3resv: ds.l 1
ap_4resv: ds.l 1
contrl: ds.w 12
int_in: ds.w 128
int_out: ds.w 128
addr_in: ds.l 64
addr_out: ds.l 64
pts_in: ds.w 128
pts_out: ds.w 128
ds.l 255
stack: ds.l 1
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