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cc65/asminc/tgi-kernel.inc
uz 975a06c2ee Rewrote tgi_load_driver in assembler and fixed a possible memory leak when 
doing so. Changed the behaviour in case a driver is already loaded: Since the
library cannot know if this driver was linked statically or loaded
dynamically, an already installed driver is considered an error. It must be
removed before calling tgi_load_driver.


git-svn-id: svn://svn.cc65.org/cc65/trunk@5790 b7a2c559-68d2-44c3-8de9-860c34a00d81
2012-07-22 11:07:46 +00:00

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;*****************************************************************************/
;* */
;* tgi-kernel.inc */
;* */
;* TGI kernel interface */
;* */
;* */
;* */
;* (C) 2002-2012, Ullrich von Bassewitz */
;* Roemerstrasse 52 */
;* D-70794 Filderstadt */
;* EMail: uz@cc65.org */
;* */
;* */
;* This software is provided 'as-is', without any expressed or implied */
;* warranty. In no event will the authors be held liable for any damages */
;* arising from the use of this software. */
;* */
;* Permission is granted to anyone to use this software for any purpose, */
;* including commercial applications, and to alter it and redistribute it */
;* freely, subject to the following restrictions: */
;* */
;* 1. The origin of this software must not be misrepresented; you must not */
;* claim that you wrote the original software. If you use this software */
;* in a product, an acknowledgment in the product documentation would be */
;* appreciated but is not required. */
;* 2. Altered source versions must be plainly marked as such, and must not */
;* be misrepresented as being the original software. */
;* 3. This notice may not be removed or altered from any source */
;* distribution. */
;* */
;*****************************************************************************/
;------------------------------------------------------------------------------
; The driver header
.struct TGI_HDR
ID .byte 3 ; Contains 0x74, 0x67, 0x69 ("tgi")
VERSION .byte 1 ; Interface version
VARS .struct
XRES .word 1 ; X resolution
YRES .word 1 ; Y resolution
COLORCOUNT .byte 1 ; Number of available colors
PAGECOUNT .byte 1 ; Number of screens available
FONTWIDTH .byte 1 ; System font width in pixel
FONTHEIGHT .byte 1 ; System font height in pixel
ASPECTRATIO .word 1 ; Fixed point 8.8 format
FLAGS .byte 1 ; TGI driver flags
.endstruct
JUMPTAB .struct
INSTALL .addr ; INSTALL routine
UNINSTALL .addr ; UNINSTALL routine
INIT .addr ; INIT routine
DONE .addr ; DONE routine
GETERROR .addr ; GETERROR routine
CONTROL .addr ; CONTROL routine
CLEAR .addr ; CLEAR routine
SETVIEWPAGE .addr ; SETVIEWPAGE routine
SETDRAWPAGE .addr ; SETDRAWPAGE routine
SETCOLOR .addr ; SETCOLOR routine
SETPALETTE .addr ; SETPALETTE routine
GETPALETTE .addr ; GETPALETTE routine
GETDEFPALETTE .addr ; GETDEFPALETTE routine
SETPIXEL .addr ; SETPIXEL routine
GETPIXEL .addr ; GETPIXEL routine
LINE .addr ; LINE routine
BAR .addr ; BAR routine
TEXTSTYLE .addr ; TEXTSTYLE routine
OUTTEXT .addr ; OUTTEXT routine
IRQ .addr ; IRQ routine
.endstruct
.endstruct
;------------------------------------------------------------------------------
; The TGI API version, stored at TGI_HDR_VERSION
TGI_API_VERSION = $04
;------------------------------------------------------------------------------
; Bitmapped tgi driver flags, stored in TGI_HDR::VARS::FLAGS.
; Beware: Some of the bits are tested using the BIT instruction, so do not
; change the values without checking the code!
TGI_BM_FONT_FINESCALE = $80 ; Bitmap fonts are fine grained scalable
;------------------------------------------------------------------------------
; Text constants
TGI_FONT_BITMAP = 0
TGI_FONT_VECTOR = 1
TGI_TEXT_HORIZONTAL = 0
TGI_TEXT_VERTICAL = 1
;----------------------------------------------------------------------------
; Results of tgi_outcode
TGI_CLIP_NONE = $00
TGI_CLIP_LEFT = $01
TGI_CLIP_RIGHT = $02
TGI_CLIP_BOTTOM = $04
TGI_CLIP_TOP = $08
;------------------------------------------------------------------------------
; ASM accessible color constants
.global tgi_color_black:zp ; Target-specific value for black
.global tgi_color_white:zp ; Target-specific value for white
;------------------------------------------------------------------------------
; C accessible variables
.global _tgi_drv ; Pointer to driver
.global _tgi_error ; Last error code
.global _tgi_gmode ; Flag: graphics mode active
.global _tgi_curx ; Current drawing cursor X
.global _tgi_cury ; Current drawing cursor Y
.global _tgi_color ; Current drawing color
.global _tgi_font ; Which font to use
.global _tgi_textdir ; Current text direction
.global _tgi_vectorfont ; Pointer to vector font
.global _tgi_textscalew ; Text magnification for the width
.global _tgi_textscaleh ; Text magnification for the height
.global _tgi_charwidth ; Width of scaled system font char
.global _tgi_charheight ; Height of scaled system font char
.global _tgi_xres ; X resolution of the current mode
.global _tgi_yres ; Y resolution of the current mode
.global _tgi_xmax ; Maximum X coordinate
.global _tgi_ymax ; Maximum Y coordinate
.global _tgi_colorcount ; Number of available colors
.global _tgi_pagecount ; Number of available screen pages
.global _tgi_fontwidth ; System font width
.global _tgi_fontheight ; System font height
.global _tgi_aspectratio ; Aspect ratio, fixed point 8.8
.global _tgi_flags ; TGI driver flags
;------------------------------------------------------------------------------
; ASM accessible variables
.global tgi_clip_x1 ; Coordinate for line clipper
.global tgi_clip_y1 ; Coordinate for line clipper
.global tgi_clip_x2 ; Coordinate for line clipper
.global tgi_clip_y2 ; Coordinate for line clipper
;------------------------------------------------------------------------------
; Driver entry points
.global tgi_install
.global tgi_uninstall
.global tgi_init
.global tgi_done
.global tgi_geterror
.global tgi_control
.global tgi_clear
.global tgi_setviewpage
.global tgi_setdrawpage
.global tgi_setcolor
.global tgi_setpalette
.global tgi_getpalette
.global tgi_getdefpalette
.global tgi_setpixel
.global tgi_getpixel
.global tgi_line
.global tgi_bar
.global tgi_textstyle
.global tgi_outtext
;------------------------------------------------------------------------------
; ASM functions
.global tgi_clear_ptr
.global tgi_clippedline
.global tgi_curtoxy
.global tgi_getset
.global tgi_imulround
.global tgi_inv_arg
.global tgi_inv_drv
.global tgi_linepop
.global tgi_outcode
.global tgi_popxy
.global tgi_popxy2
.global tgi_set_ptr
;------------------------------------------------------------------------------
; C callable functions
.global _tgi_arc
.global _tgi_bar
.global _tgi_circle
.global _tgi_clear
.global _tgi_done
.global _tgi_ellipse
.global _tgi_getaspectratio
.global _tgi_getcolor
.global _tgi_getcolorcount
.global _tgi_getdefpalette
.global _tgi_geterror
.global _tgi_geterrormsg
.global _tgi_getmaxcolor
.global _tgi_getmaxx
.global _tgi_getmaxy
.global _tgi_getpagecount
.global _tgi_getpalette
.global _tgi_getpixel
.global _tgi_gettextheight
.global _tgi_gettextwidth
.global _tgi_getxres
.global _tgi_getyres
.global _tgi_gotoxy
.global _tgi_imulround
.global _tgi_init
.global _tgi_install
.global _tgi_install_vectorfont
.global _tgi_ioctl
.global _tgi_line
.global _tgi_lineto
.global _tgi_load_driver
.global _tgi_outtext
.global _tgi_outtextxy
.global _tgi_pieslice
.global _tgi_setaspectratio
.global _tgi_setcolor
.global _tgi_setdrawpage
.global _tgi_setpalette
.global _tgi_setpixel
.global _tgi_settextdir
.global _tgi_settextscale
.global _tgi_settextstyle
.global _tgi_setviewpage
.global _tgi_uninstall
.global _tgi_unload
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