;Hercules Graphics Card driver
;**************************************************************************
;*			    DEVICE SPECIFIC ROUTINES			  *
;*									  *   
;*		These routines and equates are device dependent.	  *
;*									  *
;*									  *
;*									  *
;**************************************************************************
;Hist
;Name	Date	Modification
;
dseg
	copyright	db	'GEMVDI V1.2  5/25/85'
			db	'Hercules Card'
			db	'Serial No. XXXX-0000-654321 '
			db	'All Rights Reserved'
			db	'Copyright (C) 1985 '
			db	'Digital Research Inc.'
cseg
;
	public	INIT_G,DINIT_G
	public	CONCAT
	public	TRAN_FM
	public	EX_TIMV
	public	S_COLMAP
	public	I_COLMAP
;
	extrn	entry:near		;the place to jump to if this module
;integer array indexing equates
	W_1	equ	word ptr 0
	W_2	equ	word ptr 2
	W_3	equ	word ptr 4
	W_4	equ	word ptr 6
	W_5	equ	word ptr 8
	W_6	equ	word ptr 10
	W_7	equ	word ptr 12
	W_8	equ	word ptr 14
	W_9	equ	word ptr 16
	W_10	equ	word ptr 18
;
include externs.a86
ibmvdi	equ 0			;leave out the old code if for retail
;
;****************************************************************
;		IBM STANDARD ROM BIOS CALLS			*
;****************************************************************
SCREEN	equ	10H		;interrupts to use for rom routine I/O
KEYBD	equ	16H
rev_vid_on	equ	70h		;turn on reverse video bits
rev_vid_off	equ	07h		;turn off reverse video bits 
;
read_cur_pos	equ	3			;bios rom calls for char I/O
set_cur_pos	equ	2
read_char	equ	8
write_char	equ	9
set_palette	equ	0bh
get_character	equ	0			;keyboard read
;
EJECT
;
	jmp	entry		;if we come in from here, go to real entry
;****************************************	
;escape func 2
; Enter Graphics Mode 
;****************************************	
INIT_G:
	pushf
	mov	ax,cs
	mov	usermot+2,ax		;init the user call vectors segs
	mov	userbut+2,ax
	mov	usercur+2,ax
	mov	ax,offset umotvec
	mov	usermot,ax
	mov	ax,offset ubutvec
	mov	userbut,ax
	mov	ax,offset mov_cur
	mov	usercur,ax
	popf

escfn2: 
	mov	dispmode,0		; 
	call	clearmem		; clear graphics display
	mov	dx, 03bfh
	mov	al, 1
	out	dx, al			; allow graphics on new cards
	mov	si,offset crt_init_table_g
	mov	al,2h
	call	crt_init
if mouse
	mov	bl,1
	call	mouse_function		;initialize the mouse
	mov	bl,2
	call	mouse_function
	mov	bl,1
	call	mouse_function
endif
	ret
;
;****************************************	
;escape func 3
; Exit Graphics Mode
;****************************************	
DINIT_G:
escfn3: 				; 
if mouse
	mov	bl,2			;de init the mouse
	call	mouse_function
endif
	mov	dispmode,1		; 
	call	clearmem		; clear graphics display.
	mov	si,offset crt_init_table_a
	mov	al,20h			; alpha mode
	call	crt_init
	mov	attribute,rev_vid_off
if ibmvdi
	call	escfn8			;home
	call	escfn9			;clear to end of screen
else
	mov	ah,2				;set cursor position 0,0
	xor	dx, dx
	mov	bh, dh
	int	10h
	mov	ah, 9
	xor	bh, bh
	mov	cx, 2000
	mov	al, 20h
	mov	bl, 7
	int	10h
endif
	ret
;
;*****************************************************************
;crt_init
;	initializes the display controller with data from table
;*****************************************************************
crt_init:
	push	ax
	mov	dx,3b8h
	out	dx,al
	mov	dx,03b4h		;select port
	mov	cx,12
	xor	ah,ah
crt_init_loop:
	mov	al,ah
	out	dx,al
	inc	dx
	lodsb
	out	dx,al
	inc	ah
	dec	dx
	loop	crt_init_loop
	mov	dx,3b8h
	pop	ax
	add	al,8
	out	dx,al
	ret
EJECT
;****************************************************************
;I_COLMAP							*	
;	ENTRY	                                        	*
;		INTIN[0] = color index				*
;		INTIN[1] = req or actual flag			*
;								*
;	EXIT	                             			*
;		INTOUT[0] = color index				*
;		INTOUT[1] = RED					*
;		INTOUT[2] = GRN					*
;		INTOUT[3] = BLU					*
;								*
;	Reg. Used. AX, BX, CX, DX, DI				*
;								*
;****************************************************************
I_COLMAP:
	mov	bx, INTIN		;check if the index is in range of dev
	cmp	bx, 0
	jge	i_colmap_chkix
	jmps	i_colmap_badix
i_colmap_chkix:
	cmp	bx, num_colors-1	;test if index is too high
	jle	i_colmap_ixok
	jmps	i_colmap_badix
i_colmap_ixok:
	shl	bx, 1
	mov	bx, MAP_COL[bx]
	mov	di, bx			; di = ptr to act/req col tbls
	shl	di, 1
	shl	di, 1
	add	di, bx
	add	di, bx			; mpy ix by 6 to point into table
	mov	si, offset INTOUT+2
	mov	cx, 3
	mov	INTOUT, bx		; return the color index
	mov	bx, offset req_col_tbl
	test	INTIN+2, 0ffffh		; if != 0 then return actual values
	jz	i_colmap_load
	mov	bx, offset act_col_tbl
i_colmap_load:
	mov	ax, [bx+di]
	mov	[si], ax
	add	di, 2
	add	si, 2
	loop	i_colmap_load
	ret
i_colmap_badix:
	mov	INTOUT, -1
	ret	
EJECT
;****************************************************************
;S_COLMAP							*	
;	ENTRY	                                        	*
;		INTIN[0] = color index				*
;		INTIN[1] = RED 0 - 1000				*
;		INTIN[1] = GRN 0 - 1000				*
;		INTIN[1] = BLU 0 - 1000				*
;								*
;	EXIT	                             			*
;		                           			*
;								*
;	Reg. Used. AX, BX, CX, DX, DI				*
;								*
;****************************************************************
S_COLMAP:
	mov	bx, INTIN		;check if the index is in range of dev
	cmp	bx, 0
	jge	s_colmap_chkix
	jmp	s_colmap_exit
s_colmap_chkix:
	cmp	bx, num_colors-1	;test if index is too high
	jle	s_colmap_ixok
	jmp	s_colmap_exit
s_colmap_ixok:
	shl	bx, 1
	mov	bx, MAP_COL[bx]
	mov	di, bx			; di = ptr to act/req col tbls
	shl	di, 1
	shl	di, 1
	add	di, bx
	add	di, bx			; mpy ix by 6 to point into table
	mov	dx, INTIN+2		; get the red value
	call	s_colmap_val
	mov	dx, INTIN+4		; get the grn value
	call	s_colmap_val
	mov	dx, INTIN+6		; get the blu values 
	call	s_colmap_val
s_colmap_exit:
	ret
; 
s_colmap_val:
	mov	req_col_tbl[di], dx	; save the requested value
	add	di, 2			; move to the next value 
	ret

EJECT
;****************************************************************
;CONCAT 							*	
;	ENTRY	Reg. BX - X-coordinate (dev. coord.)		*
;		Reg. AX - Y-coordinate (dev. coord.)		*
;								*
;	EXIT	Reg. DI - Physical address			*
;		Reg. BL - Byte index				*	
;								*
;	Reg. Used. AX, BX, CX, DX, DI				*
;								*
;****************************************************************
concat:
;	mov	cx, yresmx		;normalize y-coordinate
;	sub	cx, ax
;	mov	ax, cx
	and	bx, 03ffh		;mask off 10 lsb for x-coord.
	mov	dh,al
	shr	ax,1
	shr	ax,1
	mov	dl, bl			;save low order byte of x-coord
	and	dl, 07h 		;mask off data bit index.
	mov	cl, 3			;set count to 3
	shr	bx, cl			;shift out 3 lsb of x-coord.
	mov	cl,bytes_line
	mul	cl			;brute force calculation
					;use shift and add if possible
	add	ax, bx			;concatenate y and x coordinates in AX
	and	dh,3
	jz	concat1
	mov	cl,dh
	xor	ch,ch
concat0:
	add	ax,next_line		;if odd address, then start at next_line
	loop	concat0
concat1:mov	di, ax			;di = memory address
	xor	dh, dh
	mov	bx, dx			;bx = bit index into data byte
	ret
EJECT
;****************************************************************
;TRAN_FM							*	
;	ENTRY	                                        	*
;		                                     		*
;								*
;	EXIT	                             			*
;		                           			*
;								*
;	Reg. Used. AX, BX, CX, DX, DI				*
;								*
;****************************************************************
TRAN_FM:
	push	bp	
	push	es
	push	ds
	les	di,contrl_ptr
	mov	ax, es: word ptr 14[di]
	mov	bx, es: word ptr 16[di]		; get smfdb pointer
	mov	dx, es: word ptr 18[di]
	mov	bp, es: word ptr 20[di]		; get dmfdb pointer
	mov	es, bx
	mov	di, ax				; set es:di to it
	mov	ax, es: word ptr 12[di]		; get num of planes in source
; xform n to n planes
	push	ax				; save the plane count
	call	calc_src_form
	call	calc_des_form
	call	calc_seg_off
	pop	bx				; get the plane count back
col_to_col_lp:
	push	si
	push	di
	push	bx
	push	cx
col_to_col_loop:
	lodsw
if not byte_swap
	xchg	ah,al
endif
if rev_vid
	not	ax
endif
	stosw
	loop	col_to_col_loop
	pop	cx
	pop	bx
	pop	di
	pop	si
	call	tran_next_seg
	dec	bx
	jnz	col_to_col_lp
	pop	ds
	pop	es
	pop	bp
	ret
tran_next_seg:
	push	cx
	mov	ax, cx
	mov	cl, 3
	shr	ax, cl			;get the segment increment
	mov	bp, es
	add	bp, ax
	mov	es, bp
	mov	bp, ds
	add	bp, ax
	mov	ds, bp
	pop	cx
	mov	ax, cx			;get the byte increment
	and	ax, 0007h
	shl	ax, 1
	add	si, ax
	add	di, ax
	ret
;
calc_seg_off:
	mov	bp, cx				; find the next seg
	shr	bp,1
	shr	bp,1
	shr	bp,1
	mov	dx, cx
	shl	dx, 1
	and	dx, 000fh			; find the incremental offset
;	mov	bx,num_planes
	ret
;
calc_des_form:
	mov	ds, bp
	mov	si, dx				; load dmfdb pointer
	not	bx
	and	bx,1				; invert format
	mov	10[si],bx			; toggle dest form
	mov	ax, es: word ptr 2[di]		; get source ptr seg
	mov	di, es: word ptr [di]		; offset
	mov	es, ax
	mov	ax, 2[si]
	mov	si, [si]			; get dest ptr seg,offset
	mov	ds, ax
	xchg	si,di				; swap pointers
	mov	ax, es
	mov	dx, ds
	mov	es, dx
	mov	ds, ax
	ret
;
calc_src_form:
	mov	bx, es: word ptr 10[di]		; get the format flag
	mov	ax, es: word ptr 8[di]		; get the width in words
	mov	cx, es: word ptr 6[di]		; get the height in pixels
	push	dx
	mul	cx
	pop	dx
	mov	cx, ax				; cx = word count
	and	bx,bx				; if bx = 0 then dev spec form
	ret

;****************************************************************
;EX_TIMV							*	
;	ENTRY	                                        	*
;		CONTRL 7,8 = NEW VEC                            *
;	EXIT	                             			*
;		                           			*
;		CONTRL 9,10 = OLD VEC				*
;               INTOUT [0] = TIMER TICK COUNT IN MILLISECS	*
;								*
;****************************************************************
EX_TIMV:
	pushf
	cli
	push	es
	push	ds
	les	di,contrl_ptr
	xor	ax,ax
	mov	ds,ax
	mov	si,4 * 1ch		;setup the offset to timer int vector
	mov	ax,[si]
	mov	es:word ptr 18[di],ax	;save old timer vector
	mov	ax,2[si]
	mov	es:word ptr 20[di],ax
	mov	ax, es:word ptr 14[di]
	mov	[si],ax
	mov	ax, es:word ptr 16[di]
	mov	2[si],ax
	pop	ds
	pop	es
	popf
	mov	ax,1
	mov	CONTRL+8,ax		; flag that data is to be returned 
	mov	ax, 55	
	mov	INTOUT, ax		; return the millisec/tick count 
	ret

EJECT
include	ibmmdvsp.a86
if mouse
	cseg
include imouse.a86
endif
	cseg
include monmmre1.a86
include	monmmre2.a86
	dseg
include devdata.a86
crt_init_table_g   db	35h,2dh,2eh,07h
		   db	5bh,2h,57h,57h
		   db	2,3,0,0
;
crt_init_table_a   db	61h,50h,52h,0fh,19h,6h,19h,19h,2,0dh,0bh,0ch
;
dispmode	dw	1		; 
if not rev_vid
act_col_tbl	dw	   0,    0,    0	;black
		dw	1000, 1000, 1000	;white
req_col_tbl	dw	   0,    0,    0	;black
		dw	1000, 1000, 1000	;white
else
act_col_tbl	dw	1000, 1000, 1000	;white
		dw	   0,    0,    0	;black
req_col_tbl	dw	1000, 1000, 1000	;white
		dw	   0,    0,    0
endif
MAP_COL		dw	0
		dw	1		;red
		dw	1		;green
		dw	1		;blue
		dw	1		;cyan
		dw	1		;yellow	
		dw	1		;magenta
		dw	1		;white
		dw	1
		dw	1
		dw	1
		dw	1
		dw	1
		dw	1
		dw	1
		dw	1