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source: xtideuniversalbios/trunk/Assembly_Library/Src/Display/DisplayContext.asm @ 489

Last change on this file since 489 was 489, checked in by gregli@…, 11 years ago
Added version string to initial title banner, for cases where there is not a boot menu (just hotkeys, or no hotkeys). Also ifdef'd out some unused code.
File size: 10.6 KB

Rev	Line
[41]	1	; Project name : Assembly Library
	2	; Description : Functions for managing display context.
	3
[376]	4	;
	5	; XTIDE Universal BIOS and Associated Tools
	6	; Copyright (C) 2009-2010 by Tomi Tilli, 2011-2012 by XTIDE Universal BIOS Team.
	7	;
	8	; This program is free software; you can redistribute it and/or modify
	9	; it under the terms of the GNU General Public License as published by
	10	; the Free Software Foundation; either version 2 of the License, or
	11	; (at your option) any later version.
	12	;
	13	; This program is distributed in the hope that it will be useful,
	14	; but WITHOUT ANY WARRANTY; without even the implied warranty of
	15	; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	16	; GNU General Public License for more details.
	17	; Visit http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
	18	;
	19
[41]	20	; Section containing code
	21	SECTION .text
	22
	23	;--------------------------------------------------------------------
	24	; DisplayContext_Initialize
	25	; Parameters:
	26	; DS: BDA segment (zero)
	27	; Returns:
	28	; Nothing
	29	; Corrupts registers:
	30	; AX, DX, DI
	31	;--------------------------------------------------------------------
[369]	32	ALIGN DISPLAY_JUMP_ALIGN
[41]	33	DisplayContext_Initialize:
	34	mov WORD [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.fnCharOut], DEFAULT_CHARACTER_OUTPUT
[44]	35	mov BYTE [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.bAttribute], SCREEN_BACKGROUND_ATTRIBUTE
[407]	36	call DisplayCursor_GetDefaultCursorShapeToAX
[287]	37	mov [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.wCursorShape], ax
[101]	38	; Fall to .DetectAndSetDisplaySegment
[41]	39
	40	;--------------------------------------------------------------------
	41	; .DetectAndSetDisplaySegment
	42	; Parameters:
	43	; DS: BDA segment (zero)
	44	; Returns:
	45	; Nothing
	46	; Corrupts registers:
[50]	47	; AX, DX
[41]	48	;--------------------------------------------------------------------
	49	.DetectAndSetDisplaySegment:
[50]	50	mov ax, COLOR_TEXT_SEGMENT
[41]	51	cmp BYTE [VIDEO_BDA.bMode], MDA_TEXT_MODE
[101]	52	eCMOVE ah, MONO_TEXT_SEGMENT >> 8
[50]	53	mov [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.fpCursorPosition+2], ax
[101]	54	; Fall to .InitializeFlags
[50]	55
	56	;--------------------------------------------------------------------
	57	; .InitializeFlags
	58	; Parameters:
	59	; DS: BDA segment (zero)
	60	; Returns:
	61	; Nothing
	62	; Corrupts registers:
	63	; AX, DX
	64	;--------------------------------------------------------------------
	65	.InitializeFlags:
	66	mov dl, FLG_CONTEXT_ATTRIBUTES
	67	call CgaSnow_IsCgaPresent
	68	jnc SHORT .DoNotSetCgaFlag
	69	or dl, FLG_CONTEXT_CGA
	70	.DoNotSetCgaFlag:
	71	mov [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.bFlags], dl
[101]	72	; Fall to .InitializeCursor
[41]	73
[101]	74	;--------------------------------------------------------------------
	75	; .InitializeCursor
	76	; Parameters:
	77	; DS: BDA segment (zero)
	78	; Returns:
	79	; Nothing
	80	; Corrupts registers:
	81	; AX, DX
	82	;--------------------------------------------------------------------
	83	.InitializeCursor:
[115]	84	call DisplayCursor_GetHardwareCoordinatesToAX ; Coordinates before init
	85	call DisplayCursor_SetCoordinatesFromAX ; Cursor to Display Context
[101]	86	; Fall to DisplayContext_SynchronizeToHardware
[41]	87
	88	;--------------------------------------------------------------------
[101]	89	; DisplayContext_SynchronizeToHardware
	90	; Parameters:
	91	; DS: BDA segment (zero)
	92	; Returns:
	93	; Nothing
	94	; Corrupts registers:
	95	; AX, DX
	96	;--------------------------------------------------------------------
[369]	97	ALIGN DISPLAY_JUMP_ALIGN
[101]	98	DisplayContext_SynchronizeToHardware:
	99	call DisplayPage_SynchronizeToHardware
	100	call DisplayCursor_SynchronizeShapeToHardware
	101	jmp DisplayCursor_SynchronizeCoordinatesToHardware
	102
	103
[489]	104	%ifdef INCLUDE_MENU_LIBRARY
	105
[101]	106	;--------------------------------------------------------------------
[41]	107	; DisplayContext_Push
	108	; Parameters:
	109	; Nothing
	110	; Returns:
	111	; Nothing
	112	; Corrupts registers:
	113	; AX, DI
	114	;--------------------------------------------------------------------
[369]	115	ALIGN DISPLAY_JUMP_ALIGN
[41]	116	DisplayContext_Push:
	117	mov di, ds ; Backup DS
	118	LOAD_BDA_SEGMENT_TO ds, ax
	119	pop ax ; Pop return address
	120
[194]	121	%ifndef CHECK_FOR_UNUSED_ENTRYPOINTS
[41]	122	%assign i 0
	123	%rep DISPLAY_CONTEXT_size / 2
	124	push WORD [VIDEO_BDA.displayContext + i]
	125	%assign i i+2
	126	%endrep
[194]	127	%endif
	128
[41]	129	mov ds, di ; Restore DS
	130	jmp ax
	131
	132	;--------------------------------------------------------------------
	133	; DisplayContext_Pop
	134	; Parameters:
	135	; Nothing
	136	; Returns:
	137	; Nothing
	138	; Corrupts registers:
	139	; AX, DI
	140	;--------------------------------------------------------------------
[369]	141	ALIGN DISPLAY_JUMP_ALIGN
[41]	142	DisplayContext_Pop:
	143	mov di, ds ; Backup DS
	144	LOAD_BDA_SEGMENT_TO ds, ax
	145	pop ax ; Pop return address
	146
[194]	147	%ifndef CHECK_FOR_UNUSED_ENTRYPOINTS
[41]	148	%assign i DISPLAY_CONTEXT_size-2
	149	%rep DISPLAY_CONTEXT_size / 2
	150	pop WORD [VIDEO_BDA.displayContext + i]
	151	%assign i i-2
	152	%endrep
[194]	153	%endif
	154
[41]	155	push ax ; Push return address
	156	push dx
	157	call DisplayContext_SynchronizeToHardware
	158	pop dx
	159	mov ds, di ; Restore DS
	160	ret
[489]	161	%endif
[41]	162
	163	;--------------------------------------------------------------------
[52]	164	; DisplayContext_PrepareOffScreenBufferInESBXwithLengthInCX
[48]	165	; Parameters:
[52]	166	; CX: Off screen buffer length in characters
	167	; ES:BX: Ptr to off screen buffer
[48]	168	; Returns:
	169	; Nothing
	170	; Corrupts registers:
[52]	171	; AX, DI
[48]	172	;--------------------------------------------------------------------
[133]	173	%ifndef EXCLUDE_FROM_XTIDE_UNIVERSAL_BIOS
[369]	174	ALIGN DISPLAY_JUMP_ALIGN
[52]	175	DisplayContext_PrepareOffScreenBufferInESBXwithLengthInCX:
[48]	176	push ds
	177
	178	LOAD_BDA_SEGMENT_TO ds, di
	179	xchg ax, bx
	180	mov bx, es
	181	call DisplayContext_SetCharacterPointerFromBXAX ; ES:DI now has the pointer
	182
	183	mov bl, ATTRIBUTES_NOT_USED
	184	mov ax, BUFFER_OUTPUT_WITH_CHAR_ONLY
	185	call DisplayContext_SetCharOutputFunctionFromAXwithAttribFlagInBL
[52]	186	mov [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.wCharOutParam], cx
[48]	187
	188	mov bx, di
	189	pop ds
	190	ret
	191
[489]	192	%endif ; INCLUDE_MENU_LIBRARY
[48]	193
[489]	194
[48]	195	;--------------------------------------------------------------------
[41]	196	; DisplayContext_SetCharacterPointerFromBXAX
	197	; Parameters:
	198	; BX:AX: Ptr to destination for next character to output
	199	; DS: BDA segment (zero)
	200	; Returns:
[48]	201	; ES:DI: Pointer that was in BX:AX
[41]	202	; Corrupts registers:
	203	; AX
	204	;--------------------------------------------------------------------
[133]	205	%ifndef EXCLUDE_FROM_XTIDE_UNIVERSAL_BIOS
[369]	206	ALIGN DISPLAY_JUMP_ALIGN
[41]	207	DisplayContext_SetCharacterPointerFromBXAX:
	208	mov [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.fpCursorPosition], ax
	209	mov [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.fpCursorPosition+2], bx
	210	xchg di, ax
	211	mov es, bx
	212	ret
[133]	213	%endif
[41]	214
	215
	216	;--------------------------------------------------------------------
	217	; DisplayContext_GetCharacterPointerToBXAX
	218	; Parameters:
	219	; DS: BDA segment (zero)
	220	; Returns:
	221	; BX:AX: Ptr to destination for next character to output
	222	; Corrupts registers:
	223	; Nothing
	224	;--------------------------------------------------------------------
[133]	225	%ifndef EXCLUDE_FROM_XTIDE_UNIVERSAL_BIOS
[369]	226	ALIGN DISPLAY_JUMP_ALIGN
[41]	227	DisplayContext_GetCharacterPointerToBXAX:
	228	mov ax, [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.fpCursorPosition]
	229	mov bx, [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.fpCursorPosition+2]
	230	ret
[133]	231	%endif
[41]	232
[489]	233	%ifdef INCLUDE_MENU_LIBRARY
[41]	234
	235	;--------------------------------------------------------------------
[45]	236	; DisplayContext_SetCharOutputFunctionFromAXwithAttribFlagInBL
[41]	237	; Parameters:
	238	; AX: Offset to character output function
[45]	239	; BL: Attribute Flag
[41]	240	; DS: BDA segment (zero)
	241	; Returns:
	242	; Nothing
	243	; Corrupts registers:
[50]	244	; BL
[41]	245	;--------------------------------------------------------------------
[369]	246	ALIGN DISPLAY_JUMP_ALIGN
[45]	247	DisplayContext_SetCharOutputFunctionFromAXwithAttribFlagInBL:
[50]	248	and bl, FLG_CONTEXT_ATTRIBUTES
	249	and BYTE [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.bFlags], ~FLG_CONTEXT_ATTRIBUTES
	250	or [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.bFlags], bl
[41]	251	mov [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.fnCharOut], ax
	252	ret
	253
[489]	254
[41]	255	;--------------------------------------------------------------------
	256	; DisplayContext_SetCharacterAttributeFromAL
	257	; Parameters:
	258	; AL: Character attribute
	259	; DS: BDA segment (zero)
	260	; Returns:
	261	; Nothing
	262	; Corrupts registers:
	263	; Nothing
	264	;--------------------------------------------------------------------
[369]	265	ALIGN DISPLAY_JUMP_ALIGN
[41]	266	DisplayContext_SetCharacterAttributeFromAL:
	267	mov [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.bAttribute], al
	268	ret
	269
	270
	271	;--------------------------------------------------------------------
	272	; DisplayContext_SetCharacterOutputParameterFromAX
	273	; Parameters:
	274	; AX: Parameter for Character Output function
	275	; DS: BDA segment (zero)
	276	; Returns:
	277	; Nothing
	278	; Corrupts registers:
	279	; Nothing
	280	;--------------------------------------------------------------------
[369]	281	ALIGN DISPLAY_JUMP_ALIGN
[41]	282	DisplayContext_SetCharacterOutputParameterFromAX:
	283	mov [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.wCharOutParam], ax
	284	ret
[194]	285
[489]	286	%endif ; INCLUDE_MENU_LIBRARY
	287
[41]	288	;--------------------------------------------------------------------
	289	; DisplayContext_GetCharacterOutputParameterToDX
	290	; Parameters:
	291	; DS: BDA segment (zero)
	292	; Returns:
	293	; DX: User parameter for Character Output function
	294	; Corrupts registers:
	295	; Nothing
[133]	296	;--------------------------------------------------------------------
[181]	297	%ifndef EXCLUDE_FROM_XTIDE_UNIVERSAL_BIOS OR EXCLUDE_FROM_XTIDECFG ; This is currently unused (dead code)
[369]	298	ALIGN DISPLAY_JUMP_ALIGN
[181]	299	DisplayContext_GetCharacterOutputParameterToDX:
	300	mov dx, [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.wCharOutParam]
	301	ret
	302	%endif
[44]	303
	304
	305	;--------------------------------------------------------------------
	306	; DisplayContext_GetCharacterOffsetToAXfromByteOffsetInAX
	307	; Parameters:
	308	; AX: Offset in bytes from some character to another
	309	; DS: BDA segment (zero)
	310	; Returns:
	311	; AX: Offset in characters from some character to another
	312	; Corrupts registers:
	313	; Nothing
[133]	314	;--------------------------------------------------------------------
[201]	315	%ifndef MODULE_STRINGS_COMPRESSED
[369]	316	ALIGN DISPLAY_JUMP_ALIGN
[44]	317	DisplayContext_GetCharacterOffsetToAXfromByteOffsetInAX:
	318	test BYTE [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.bFlags], FLG_CONTEXT_ATTRIBUTES
	319	jz SHORT ReturnOffsetInAX
	320	sar ax, 1 ; BYTE count to WORD count
	321	ret
[194]	322	%endif
[44]	323
[194]	324
[44]	325	;--------------------------------------------------------------------
	326	; DisplayContext_GetByteOffsetToAXfromCharacterOffsetInAX
	327	; Parameters:
	328	; AX: Offset in characters from some character to another
	329	; DS: BDA segment (zero)
	330	; Returns:
	331	; AX: Offset in bytes from some character to another
	332	; Corrupts registers:
	333	; Nothing
[133]	334	;--------------------------------------------------------------------
[201]	335	%ifndef MODULE_STRINGS_COMPRESSED
[369]	336	ALIGN DISPLAY_JUMP_ALIGN
[44]	337	DisplayContext_GetByteOffsetToAXfromCharacterOffsetInAX:
	338	test BYTE [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.bFlags], FLG_CONTEXT_ATTRIBUTES
	339	jz SHORT ReturnOffsetInAX
	340	sal ax, 1 ; WORD count to BYTE count
[369]	341	ALIGN DISPLAY_JUMP_ALIGN, ret
[44]	342	ReturnOffsetInAX:
	343	ret
[194]	344	%endif

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