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798 lines
21 KiB
798 lines
21 KiB
#include "insignia.h"
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#include "host_def.h"
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/* INSIGNIA (SUB)MODULE SPECIFICATION
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-----------------------------
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THIS PROGRAM SOURCE FILE IS SUPPLIED IN CONFIDENCE TO THE
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CUSTOMER, THE CONTENTS OR DETAILS OF ITS OPERATION MUST
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NOT BE DISCLOSED TO ANY OTHER PARTIES WITHOUT THE EXPRESS
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AUTHORISATION FROM THE DIRECTORS OF INSIGNIA SOLUTIONS LTD.
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DESIGNER : S.Frost
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REVISION HISTORY :
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First version : 12 Aug 1988, J.Roper
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SOURCE FILE NAME : ega_mode.c
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PURPOSE : To decide which mode the EGA is in according to variables set in ega_ports.c and
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to choose the appropriate update and paint routines accordingly.
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SccsID[]="@(#)ega_mode.c 1.26 06/01/95 Copyright Insignia Solutions Ltd.";
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[1.INTERMODULE INTERFACE SPECIFICATION]
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[1.0 INCLUDE FILE NEEDED TO ACCESS THIS INTERFACE FROM OTHER SUBMODULES]
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INCLUDE FILE : ega_mode.gi
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[1.1 INTERMODULE EXPORTS]
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PROCEDURES() : choose_ega_display_mode
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DATA : uses EGA_GRAPH.display_state which is set in ega_ports.c, to
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determine what memory organisation the display side is in, and
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hence what sort of update and paint routines to use.
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-------------------------------------------------------------------------
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[1.2 DATATYPES FOR [1.1] (if not basic C types)]
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STRUCTURES/TYPEDEFS/ENUMS:
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uses enum DISPLAY_STATE which is declared in ega_graph.pi.
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uses EGA_GRAPH structure for global variables set by the ports and
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used by the display.
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-------------------------------------------------------------------------
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[1.3 INTERMODULE IMPORTS]
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(not o/s objects or standard libs)
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PROCEDURES() : vote_ega_mode()
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host_set_paint_routine(DISPLAY_MODE)
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DATA : EGA_GRAPH struct.
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-------------------------------------------------------------------------
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[1.4 DESCRIPTION OF INTERMODULE INTERFACE]
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[1.4.1 IMPORTED OBJECTS]
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[1.4.2 EXPORTED OBJECTS]
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=========================================================================
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PROCEDURE : choose_ega_display_mode
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PURPOSE : To decide which memory organisation is being used by the
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ega, and to pick the best update and paint routines accordingly.
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The paint routines are host specific, and so the memory organisation
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is indicated by an enum (called DISPLAY_MODE), describing each sort
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of memory organisation.
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PARAMETERS : none
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GLOBALS : uses EGA_GRAPH struct, specially display_state to decide which mode is being used.
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=========================================================================
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/*=======================================================================
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[3.INTERMODULE INTERFACE DECLARATIONS]
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=========================================================================
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[3.1 INTERMODULE IMPORTS] */
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#ifndef REAL_VGA
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#ifdef EGG
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/* [3.1.1 #INCLUDES] */
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#include "xt.h"
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#include "error.h"
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#include "config.h"
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#include "gvi.h"
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#include "egacpu.h"
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#include "debug.h"
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#include "gmi.h"
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#include "gfx_upd.h"
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#include "egagraph.h"
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#include "vgaports.h"
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#include "egaports.h"
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#include "host_gfx.h"
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#ifdef GORE
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#include "gore.h"
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#endif /* GORE */
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/* [3.1.2 DECLARATIONS] */
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/* [3.2 INTERMODULE EXPORTS] */
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#include "egamode.h"
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boolean (*choose_display_mode)();
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/*
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5.MODULE INTERNALS : (not visible externally, global internally)]
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[5.1 LOCAL DECLARATIONS] */
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/* [5.1.1 #DEFINES] */
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#ifdef SEGMENTATION
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/*
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* The following #include specifies the code segment into which this
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* module will by placed by the MPW C compiler on the Mac II running
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* MultiFinder.
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*/
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#include "SOFTPC_EGA.seg"
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#endif
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/* [5.1.2 TYPEDEF, STRUCTURE, ENUM DECLARATIONS] */
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/* [5.1.3 PROCEDURE() DECLARATIONS] */
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/*
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=========================================================================
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PROCEDURE : set_up_screen_ptr()
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PURPOSE : Decide which plane the information must come from for displaying
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PARAMETERS : none
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GLOBALS : uses EGA_GRAPH struct, plane_mask to decide which planes are enabled
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=========================================================================
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*/
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LOCAL VOID
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set_up_screen_ptr()
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{
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if( get_memory_chained() )
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{
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if( plane01_enabled() )
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set_screen_ptr(EGA_plane01);
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else
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if( plane23_enabled() )
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set_screen_ptr(EGA_plane23);
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else
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assert0(NO,"No planes enabled for chain mode");
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}
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else
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set_screen_ptr(EGA_planes);
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}
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/* -----------------------------------------------------------------------
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[5.2 LOCAL DEFINITIONS]
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[5.2.1 INTERNAL DATA DEFINITIONS */
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GLOBAL DISPLAY_MODE choose_mode[] = {
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/* unchained, no cga mem bank, no shift reg */
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EGA_HI, /* 350 height, no pixel doubling */
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EGA_HI_WR, /* 350 height, no pixel doubling */
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EGA_HI_SP, /* 350 height, no pixel doubling */
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EGA_HI_SP_WR, /* 350 height, no pixel doubling */
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EGA_MED, /* 200 height, no pixel doubling */
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EGA_MED_WR, /* 200 height, no pixel doubling */
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EGA_MED_SP, /* 200 height, no pixel doubling */
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EGA_MED_SP_WR, /* 200 height, no pixel doubling */
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EGA_HI_FUN, /* 350 height, pixel doubling */
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EGA_HI_FUN, /* 350 height, pixel doubling */
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EGA_HI_FUN, /* 350 height, pixel doubling */
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EGA_HI_FUN, /* 350 height, pixel doubling */
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EGA_LO, /* 200 height, pixel doubling */
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EGA_LO_WR, /* 200 height, pixel doubling */
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EGA_LO_SP, /* 200 height, pixel doubling */
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EGA_LO_SP_WR, /* 200 height, pixel doubling */
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/* unchained, no cga_mem_bank, shift reg */
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EGA_HI_FUN,
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EGA_HI_FUN,
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EGA_HI_FUN,
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EGA_HI_FUN,
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EGA_MED_FUN,
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EGA_MED_FUN,
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EGA_MED_FUN,
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EGA_MED_FUN,
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EGA_HI_FUN,
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EGA_HI_FUN,
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EGA_HI_FUN,
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EGA_HI_FUN,
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EGA_LO_FUN,
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EGA_LO_FUN,
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EGA_LO_FUN,
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EGA_LO_FUN,
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/* unchained, cga_mem_bank, no shift reg */
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CGA_HI_FUN,
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CGA_HI_FUN,
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CGA_HI_FUN,
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CGA_HI_FUN,
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CGA_HI, /* 200 height, no pixel doubling, the real bios mode */
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CGA_HI_FUN, /* 200 height, no pixel doubling, the real bios mode, wrap */
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CGA_HI_FUN, /* 200 height, no pixel doubling, the real bios mode, split screen */
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CGA_HI_FUN, /* 200 height, no pixel doubling, the real bios mode, split screen, wrap */
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CGA_HI_FUN,
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CGA_HI_FUN,
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CGA_HI_FUN,
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CGA_HI_FUN,
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CGA_HI_FUN,
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CGA_HI_FUN,
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CGA_HI_FUN,
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CGA_HI_FUN,
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/* unchained, cga_mem_bank, shift reg */
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CGA_HI_FUN,
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CGA_HI_FUN,
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CGA_HI_FUN,
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CGA_HI_FUN,
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CGA_HI_FUN,
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CGA_HI_FUN,
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CGA_HI_FUN,
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CGA_HI_FUN,
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CGA_HI_FUN,
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CGA_HI_FUN,
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CGA_HI_FUN,
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CGA_HI_FUN,
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CGA_HI_FUN,
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CGA_HI_FUN,
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CGA_HI_FUN,
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CGA_HI_FUN,
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/* chained, no cga_mem_bank, no shift reg */
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EGA_TEXT_80, /* 350 scan lines */
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EGA_TEXT_80_WR, /* 350 scan lines */
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EGA_TEXT_80_SP, /* 350 scan lines */
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EGA_TEXT_80_SP_WR, /* 350 scan lines */
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CGA_TEXT_80, /* 200 scan lines */
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CGA_TEXT_80_WR, /* 200 scan lines */
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CGA_TEXT_80_SP, /* 200 scan lines */
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CGA_TEXT_80_SP_WR, /* 200 scan lines */
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EGA_TEXT_40, /* 350 scan lines */
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EGA_TEXT_40_WR, /* 350 scan lines */
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EGA_TEXT_40_SP, /* 350 scan lines */
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EGA_TEXT_40_SP_WR, /* 350 scan lines */
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CGA_TEXT_40, /* 200 scan lines */
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CGA_TEXT_40_WR, /* 200 scan lines */
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CGA_TEXT_40_SP, /* 200 scan lines */
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CGA_TEXT_40_SP_WR, /* 200 scan lines */
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/* chained, no cga_mem_bank, shift reg */
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TEXT_80_FUN,
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TEXT_80_FUN,
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TEXT_80_FUN,
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TEXT_80_FUN,
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TEXT_80_FUN,
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TEXT_80_FUN,
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TEXT_80_FUN,
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TEXT_80_FUN,
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TEXT_40_FUN,
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TEXT_40_FUN,
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TEXT_40_FUN,
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TEXT_40_FUN,
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TEXT_40_FUN,
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TEXT_40_FUN,
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TEXT_40_FUN,
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TEXT_40_FUN,
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/* chained, cga mem bank, no shift reg */
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CGA_MED_FUN,
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CGA_MED_FUN,
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CGA_MED_FUN,
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CGA_MED_FUN,
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CGA_MED_FUN,
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CGA_MED_FUN,
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CGA_MED_FUN,
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CGA_MED_FUN,
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CGA_MED_FUN,
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CGA_MED_FUN,
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CGA_MED_FUN,
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CGA_MED_FUN,
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CGA_MED_FUN,
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CGA_MED_FUN,
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CGA_MED_FUN,
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CGA_MED_FUN,
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/* chained, cga mem banks shift reg */
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CGA_MED_FUN, /* not 200 scan lines and not double pix width */
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CGA_MED_FUN, /* not 200 scan lines and not double pix width, wrap */
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CGA_MED_FUN, /* not 200 scan lines and not double pix width, split */
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CGA_MED_FUN, /* not 200 scan lines and not double pix width, wrap split */
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CGA_MED_FUN, /* not double pix width */
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CGA_MED_FUN, /* not double pix width */
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CGA_MED_FUN, /* not double pix width */
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CGA_MED_FUN, /* not double pix width */
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CGA_MED_FUN, /* not 200 scan lines */
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CGA_MED_FUN, /* not 200 scan lines */
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CGA_MED_FUN, /* not 200 scan lines */
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CGA_MED_FUN, /* not 200 scan lines */
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CGA_MED, /* proper bios mode */
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CGA_MED_FUN, /* proper bios mode, wrap */
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CGA_MED_FUN, /* proper bios mode, split */
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CGA_MED_FUN, /* proper bios mode, split, wrap */
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/* text mode(!), unchained, no cga mem bank, no shift reg
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** we think the textness overrides the unchainedness
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*/
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TEXT_80_FUN,
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TEXT_80_FUN,
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TEXT_80_FUN,
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TEXT_80_FUN,
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TEXT_80_FUN,
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TEXT_80_FUN,
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TEXT_80_FUN,
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TEXT_80_FUN,
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TEXT_40_FUN,
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TEXT_40_FUN,
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TEXT_40_FUN,
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TEXT_40_FUN,
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TEXT_40_FUN,
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TEXT_40_FUN,
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TEXT_40_FUN,
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TEXT_40_FUN,
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/* unchained, no cga_mem_bank, shift reg */
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EGA_HI_FUN,
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EGA_HI_FUN,
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EGA_HI_FUN,
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EGA_HI_FUN,
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EGA_MED_FUN,
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EGA_MED_FUN,
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EGA_MED_FUN,
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EGA_MED_FUN,
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EGA_HI_FUN,
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EGA_HI_FUN,
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EGA_HI_FUN,
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EGA_HI_FUN,
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EGA_LO_FUN,
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EGA_LO_FUN,
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EGA_LO_FUN,
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EGA_LO_FUN,
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/* unchained, cga_mem_bank, no shift reg */
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CGA_HI_FUN,
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CGA_HI_FUN,
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CGA_HI_FUN,
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CGA_HI_FUN,
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CGA_HI, /* 200 height, no pixel doubling, the real bios mode */
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CGA_HI_FUN, /* 200 height, no pixel doubling, the real bios mode, wrap */
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CGA_HI_FUN, /* 200 height, no pixel doubling, the real bios mode, split screen */
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CGA_HI_FUN, /* 200 height, no pixel doubling, the real bios mode, split screen, wrap */
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CGA_HI_FUN,
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CGA_HI_FUN,
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CGA_HI_FUN,
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CGA_HI_FUN,
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CGA_HI_FUN,
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CGA_HI_FUN,
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CGA_HI_FUN,
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CGA_HI_FUN,
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/* unchained, cga_mem_bank, shift reg */
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CGA_HI_FUN,
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CGA_HI_FUN,
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CGA_HI_FUN,
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CGA_HI_FUN,
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CGA_HI_FUN,
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CGA_HI_FUN,
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CGA_HI_FUN,
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CGA_HI_FUN,
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CGA_HI_FUN,
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CGA_HI_FUN,
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CGA_HI_FUN,
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CGA_HI_FUN,
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CGA_HI_FUN,
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CGA_HI_FUN,
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CGA_HI_FUN,
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CGA_HI_FUN,
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/* chained, no cga_mem_bank, no shift reg */
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EGA_TEXT_80, /* 350 scan lines */
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EGA_TEXT_80_WR, /* 350 scan lines */
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EGA_TEXT_80_SP, /* 350 scan lines */
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EGA_TEXT_80_SP_WR, /* 350 scan lines */
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CGA_TEXT_80, /* 200 scan lines */
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CGA_TEXT_80_WR, /* 200 scan lines */
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CGA_TEXT_80_SP, /* 200 scan lines */
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CGA_TEXT_80_SP_WR, /* 200 scan lines */
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EGA_TEXT_40, /* 350 scan lines */
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EGA_TEXT_40_WR, /* 350 scan lines */
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EGA_TEXT_40_SP, /* 350 scan lines */
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EGA_TEXT_40_SP_WR, /* 350 scan lines */
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CGA_TEXT_40, /* 200 scan lines */
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CGA_TEXT_40_WR, /* 200 scan lines */
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CGA_TEXT_40_SP, /* 200 scan lines */
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CGA_TEXT_40_SP_WR, /* 200 scan lines */
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/* chained, no cga_mem_bank, shift reg */
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TEXT_80_FUN,
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TEXT_80_FUN,
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TEXT_80_FUN,
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TEXT_80_FUN,
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TEXT_80_FUN,
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TEXT_80_FUN,
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TEXT_80_FUN,
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TEXT_80_FUN,
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TEXT_40_FUN,
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TEXT_40_FUN,
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TEXT_40_FUN,
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TEXT_40_FUN,
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TEXT_40_FUN,
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TEXT_40_FUN,
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TEXT_40_FUN,
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TEXT_40_FUN,
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/* chained, cga mem bank, no shift reg */
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CGA_MED_FUN,
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CGA_MED_FUN,
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CGA_MED_FUN,
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CGA_MED_FUN,
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CGA_MED_FUN,
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CGA_MED_FUN,
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CGA_MED_FUN,
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CGA_MED_FUN,
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CGA_MED_FUN,
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CGA_MED_FUN,
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CGA_MED_FUN,
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CGA_MED_FUN,
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CGA_MED_FUN,
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CGA_MED_FUN,
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CGA_MED_FUN,
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CGA_MED_FUN,
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/* chained, cga mem banks shift reg */
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CGA_MED_FUN, /* not 200 scan lines and not double pix width */
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CGA_MED_FUN, /* not 200 scan lines and not double pix width, wrap */
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CGA_MED_FUN, /* not 200 scan lines and not double pix width, split */
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CGA_MED_FUN, /* not 200 scan lines and not double pix width, wrap split */
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CGA_MED_FUN, /* not double pix width */
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CGA_MED_FUN, /* not double pix width */
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CGA_MED_FUN, /* not double pix width */
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CGA_MED_FUN, /* not double pix width */
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CGA_MED_FUN, /* not 200 scan lines */
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CGA_MED_FUN, /* not 200 scan lines */
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CGA_MED_FUN, /* not 200 scan lines */
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CGA_MED_FUN, /* not 200 scan lines */
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CGA_MED, /* proper bios mode */
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CGA_MED_FUN, /* proper bios mode, wrap */
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CGA_MED_FUN, /* proper bios mode, split */
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CGA_MED_FUN, /* proper bios mode, split, wrap */
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};
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/* [5.2.2 INTERNAL PROCEDURE DEFINITIONS] */
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LOCAL void ega_dummy_calc IFN0()
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{
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}
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static void set_update_routine(mode)
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DISPLAY_MODE mode;
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{
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#ifndef NTVDM
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static int last_height = 200;
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if (last_height != get_screen_height()) {
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last_height = get_screen_height();
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}
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note_entrance1("set_update_routine called for mode %s", get_mode_string(mode) );
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switch (mode) {
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case EGA_TEXT_40_SP_WR:
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case EGA_TEXT_80_SP_WR:
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case CGA_TEXT_40_SP_WR:
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case CGA_TEXT_80_SP_WR:
|
|
assert0( is_it_text(), "In text memory mode, but not in alpha mode !!" );
|
|
set_gfx_update_routines( ega_wrap_split_text_update, SIMPLE_MARKING, NO_SCROLL );
|
|
host_update_fonts();
|
|
break;
|
|
case EGA_TEXT_40_SP:
|
|
case EGA_TEXT_80_SP:
|
|
case CGA_TEXT_40_SP:
|
|
case CGA_TEXT_80_SP:
|
|
assert0( is_it_text(), "In text memory mode, but not in alpha mode !!" );
|
|
set_gfx_update_routines( ega_split_text_update, SIMPLE_MARKING, NO_SCROLL );
|
|
host_update_fonts();
|
|
break;
|
|
case EGA_TEXT_40_WR:
|
|
case EGA_TEXT_80_WR:
|
|
assert0( is_it_text(), "In text memory mode, but not in alpha mode !!" );
|
|
assert1( get_screen_height() == 350, "screen height %d for text mode", get_screen_height() );
|
|
set_gfx_update_routines( ega_wrap_text_update, SIMPLE_MARKING, NO_SCROLL );
|
|
host_update_fonts();
|
|
break;
|
|
case EGA_TEXT_40:
|
|
case EGA_TEXT_80:
|
|
assert0( is_it_text(), "In text memory mode, but not in alpha mode !!" );
|
|
assert1( get_screen_height() == 350, "screen height %d for text mode", get_screen_height() );
|
|
set_gfx_update_routines( ega_text_update, SIMPLE_MARKING, TEXT_SCROLL );
|
|
host_update_fonts();
|
|
break;
|
|
case CGA_TEXT_40_WR:
|
|
case CGA_TEXT_80_WR:
|
|
assert0( is_it_text(), "In text memory mode, but not in alpha mode !!" );
|
|
assert1( get_screen_height() == 200, "screen height %d for text mode", get_screen_height() );
|
|
set_gfx_update_routines( ega_wrap_text_update, SIMPLE_MARKING, NO_SCROLL );
|
|
host_update_fonts();
|
|
break;
|
|
case CGA_TEXT_40:
|
|
case CGA_TEXT_80:
|
|
assert0( is_it_text(), "In text memory mode, but not in alpha mode !!" );
|
|
assert1( get_screen_height() == 200, "screen height %d for text mode", get_screen_height() );
|
|
set_gfx_update_routines( text_update, SIMPLE_MARKING, CGA_TEXT_SCROLL );
|
|
host_update_fonts();
|
|
break;
|
|
case CGA_MED:
|
|
assert0( !is_it_text(), "In graphics memory mode, but not in graphics mode !!" );
|
|
set_gfx_update_routines( cga_med_graph_update, CGA_GRAPHICS_MARKING, CGA_GRAPH_SCROLL );
|
|
break;
|
|
case CGA_HI:
|
|
assert0( !is_it_text(), "In graphics memory mode, but not in graphics mode !!" );
|
|
set_gfx_update_routines( cga_hi_graph_update, CGA_GRAPHICS_MARKING, CGA_GRAPH_SCROLL );
|
|
break;
|
|
case EGA_HI_WR:
|
|
case EGA_MED_WR:
|
|
case EGA_LO_WR:
|
|
assert0( !is_it_text(), "In graphics memory mode, but not in graphics mode !!" );
|
|
set_gfx_update_routines( ega_wrap_graph_update, EGA_GRAPHICS_MARKING, NO_SCROLL );
|
|
break;
|
|
case EGA_HI:
|
|
case EGA_MED:
|
|
case EGA_LO:
|
|
assert0( !is_it_text(), "In graphics memory mode, but not in graphics mode !!" );
|
|
#ifdef GORE
|
|
set_gfx_update_routines( process_object_list, EGA_GRAPHICS_MARKING, EGA_GRAPH_SCROLL );
|
|
#else
|
|
set_gfx_update_routines( ega_graph_update, EGA_GRAPHICS_MARKING, EGA_GRAPH_SCROLL );
|
|
#endif /* GORE */
|
|
break;
|
|
case EGA_HI_SP_WR:
|
|
case EGA_MED_SP_WR:
|
|
case EGA_LO_SP_WR:
|
|
assert0( !is_it_text(), "In graphics memory mode, but not in graphics mode !!" );
|
|
set_gfx_update_routines( ega_wrap_split_graph_update, EGA_GRAPHICS_MARKING, NO_SCROLL );
|
|
break;
|
|
case EGA_HI_SP:
|
|
case EGA_MED_SP:
|
|
case EGA_LO_SP:
|
|
assert0( !is_it_text(), "In graphics memory mode, but not in graphics mode !!" );
|
|
set_gfx_update_routines( ega_split_graph_update, EGA_GRAPHICS_MARKING, NO_SCROLL );
|
|
break;
|
|
case TEXT_40_FUN:
|
|
case TEXT_80_FUN:
|
|
assert1(NO,"Funny memory organisation selected %s", get_mode_string(mode) );
|
|
do_display_trace("dumping EGA_GRAPH struct ...", dump_EGA_GRAPH());
|
|
set_gfx_update_routines( text_update, SIMPLE_MARKING, NO_SCROLL );
|
|
host_update_fonts();
|
|
break;
|
|
case CGA_HI_FUN:
|
|
assert1(NO,"Funny memory organisation selected %s", get_mode_string(mode) );
|
|
do_display_trace("dumping EGA_GRAPH struct ...", dump_EGA_GRAPH());
|
|
set_gfx_update_routines( cga_hi_graph_update, CGA_GRAPHICS_MARKING, NO_SCROLL );
|
|
break;
|
|
case CGA_MED_FUN:
|
|
assert1(NO,"Funny memory organisation selected %s", get_mode_string(mode) );
|
|
do_display_trace("dumping EGA_GRAPH struct ...", dump_EGA_GRAPH());
|
|
set_gfx_update_routines( cga_med_graph_update, CGA_GRAPHICS_MARKING, NO_SCROLL );
|
|
break;
|
|
case EGA_HI_FUN:
|
|
case EGA_MED_FUN:
|
|
case EGA_LO_FUN:
|
|
assert1(NO,"Funny memory organisation selected %s", get_mode_string(mode) );
|
|
do_display_trace("dumping EGA_GRAPH struct ...", dump_EGA_GRAPH());
|
|
#ifdef GORE
|
|
set_gfx_update_routines( process_object_list, EGA_GRAPHICS_MARKING, NO_SCROLL );
|
|
#else
|
|
set_gfx_update_routines( ega_graph_update, EGA_GRAPHICS_MARKING, NO_SCROLL );
|
|
#endif /* GORE */
|
|
break;
|
|
case DUMMY_FUN:
|
|
assert0(NO,"Using the dummy mode!!");
|
|
set_gfx_update_routines( ega_dummy_calc, SIMPLE_MARKING, NO_SCROLL );
|
|
break;
|
|
default:
|
|
assert1(NO,"Bad display mode %d", (int) mode );
|
|
break;
|
|
}
|
|
#endif /* NTVDM */
|
|
}
|
|
|
|
|
|
/*
|
|
7.INTERMODULE INTERFACE IMPLEMENTATION :
|
|
|
|
[7.1 INTERMODULE DATA DEFINITIONS] */
|
|
|
|
/*
|
|
[7.2 INTERMODULE PROCEDURE DEFINITIONS] */
|
|
|
|
|
|
|
|
void ega_mode_init()
|
|
{
|
|
/*
|
|
** This bit moved here from ega_video_init(), since it's all about
|
|
** the emulation of the video hardware, not the video BIOS.
|
|
** WJG 22/8/90
|
|
** Set the host graphics paint function to match the base update
|
|
** function and the PC graphics mode.
|
|
** Normally the host gfx func is not set until the next timer tick
|
|
** as the mode change can involve quite a lot of Intel instructions.
|
|
** However when booting SoftPC the EGA is going into a known mode.
|
|
** This was added to fix a convoluted Fatal bug.
|
|
** 1) Enter a gfx mode in EGA.
|
|
** 2) Reset SoftPC.
|
|
** 3) Bring up the disk panel as soon as you can.
|
|
** 4) SoftPC crashes.
|
|
** Cause: Because SoftPC was in gfx mode the paint function remains
|
|
** a gfx mode paint function even though SoftPC thinks it is now in
|
|
** text mode. When the panel is displayed a full screen update is
|
|
** forced which then gets too confused and dies.
|
|
*/
|
|
set_update_routine(DUMMY_FUN);
|
|
}
|
|
|
|
|
|
boolean choose_ega_display_mode()
|
|
{
|
|
DISPLAY_MODE mode;
|
|
int old_offset;
|
|
|
|
note_entrance0("choose ega display mode");
|
|
|
|
/*
|
|
* offset_per_line depends upon whether chained addressing is being used. This is
|
|
* because we interleave the planes, rather than anything the EGA does.
|
|
*/
|
|
|
|
old_offset = get_offset_per_line();
|
|
if ( get_memory_chained() ) {
|
|
set_offset_per_line_recal(get_actual_offset_per_line() << 1);
|
|
}
|
|
else {
|
|
set_offset_per_line_recal(get_actual_offset_per_line());
|
|
}
|
|
|
|
/*
|
|
* If the offset has actually changed, repaint the whole screen
|
|
*/
|
|
|
|
if ( old_offset != get_offset_per_line() )
|
|
screen_refresh_required();
|
|
|
|
/*
|
|
* It is possible that the display hardware will wrap the plane addressing. This occurs
|
|
* when the screen_start plus the screen_length are longer than the plane length.
|
|
* When in chained mode there is two planes length before wrapping occurs.
|
|
*/
|
|
|
|
if ( get_memory_chained() ) {
|
|
set_screen_can_wrap( (get_screen_start()<<1) + get_screen_length() > 2*EGA_PLANE_DISP_SIZE );
|
|
}
|
|
else {
|
|
set_screen_can_wrap( get_screen_start() + get_screen_length() > EGA_PLANE_DISP_SIZE );
|
|
}
|
|
|
|
/*
|
|
* split screen comes into operation when screen_split is less than screen height
|
|
* split screen used is used as part of munge_index.
|
|
*/
|
|
|
|
set_split_screen_used( get_screen_split() < get_screen_height() );
|
|
|
|
/*
|
|
* For the purposes of choosing a mode set up boolean values for chars per line (to help
|
|
* select the correct text mode), and screen height (to select EGA resolution).
|
|
*/
|
|
|
|
set_200_scan_lines( (get_screen_height()/get_pc_pix_height()) == 200 );
|
|
|
|
/*
|
|
* Set up the appropriate update routine according to the memory organisation selected
|
|
* and return an indication of whether more than 1 plane can be used by the display.
|
|
*
|
|
* Note that in chained mode plane01 is considered to be one plane. Similarly for plane23
|
|
*
|
|
* We have to be careful that a nasty program, such as EGA-PICS, hasn't set up a ridiculously big
|
|
* screen size for the CGA modes (presumably caused by us being unlucky when the timer tick goes off).
|
|
*/
|
|
if(is_it_cga() && get_screen_length() > 0x4000)
|
|
mode = DUMMY_FUN;
|
|
else
|
|
mode = choose_mode[get_munged_index()];
|
|
|
|
/*
|
|
* Now set up screen pointers appropriately.
|
|
*/
|
|
|
|
set_up_screen_ptr();
|
|
|
|
set_update_routine(mode);
|
|
|
|
/*
|
|
* set up the paint routine to correspond with the memory organisation and the update routine
|
|
* (this bit is host specific)
|
|
*/
|
|
|
|
host_set_paint_routine(mode,get_screen_height());
|
|
|
|
/*
|
|
* The screen needs refreshing, because the update and paint routines have changed.
|
|
* Indicate to the update routines that the next time they are called, they must update
|
|
* the whole screen
|
|
*/
|
|
|
|
screen_refresh_required();
|
|
return TRUE;
|
|
}
|
|
|
|
#endif /* EGG */
|
|
#endif /* REAL_VGA */
|