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341 lines
6.9 KiB
341 lines
6.9 KiB
#include "insignia.h"
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#include "host_def.h"
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/*
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* SoftPC Revision 3.0
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*
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* Title : gvi
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*
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* Description : Generic Video Interface Module internal descriptions.
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*
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* Author : Henry Nash
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*
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* Notes : The following functions are defined
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*
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* gvi_init - Set up gvi variables
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* gvi_term - Close down current video adaptor
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*
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* Note that all addresses used by these routines are
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* in host address space NOT 8088 address space.
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*
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* The data itself is not passed as a parameter in the
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* GVI calls since the 8088 memory to which the calls
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* refer may be accessed to obtain the new data.
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*
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* The default video adapter is CGA.
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*
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* Mods: (r3.4) : The Mac II running MultiFinder and MPW C has a few
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* problems. One is the difficulty in initialising
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* static variables of the form:
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*
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* host_addr x = (host_addr)M;
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*
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* This is fixed by initialising variables of this type
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* in in-line code. A crock, but what else can I do?
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*/
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/*
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* static char SccsID[]="@(#)gvi.c 1.22 8/25/93 Copyright Insignia Solutions Ltd.";
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*/
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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_BIOS.seg"
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#endif
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/*
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* O/S include files.
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*/
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#include <stdio.h>
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#include TypesH
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/*
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* SoftPC include files
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*/
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#include "xt.h"
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#include "bios.h"
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#include "sas.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 "gmi.h"
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#include "cga.h"
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#ifdef HERC
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#include "herc.h"
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#endif
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#include "debug.h"
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#include "gfx_upd.h"
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#ifdef EGG
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#include "egagraph.h"
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#include "egacpu.h"
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#endif /* EGG */
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#include "host_gfx.h"
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/*
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* External variables
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*/
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extern int soft_reset; /* Defined in reset.c */
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/*
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* Global variables reflecting the state of the currently selected adapter
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* These should be integrated with the new EGA stuff
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*/
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DISPLAY_GLOBS PCDisplay;
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int text_blk_size; /* In TEXT mode the size of a dirty block */
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/*
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* Other globals
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*/
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/*
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* These 4 variables are used by the BIOS & host stuff to indicate where the active
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* adaptor is. NB. The EGA can move!!
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*/
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host_addr gvi_host_low_regen;
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host_addr gvi_host_high_regen;
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sys_addr gvi_pc_low_regen;
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sys_addr gvi_pc_high_regen;
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half_word video_adapter = NO_ADAPTOR; /* No adaptor initially */
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/*
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* Global routines
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*/
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void recalc_screen_params IFN0()
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{
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#ifdef VGG
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if (get_doubleword_mode())
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set_bytes_per_line(get_chars_per_line()<<3);
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else
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#endif
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if (get_word_addressing())
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set_bytes_per_line(get_chars_per_line()<<1);
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else
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#ifdef V7VGA
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if (get_seq_chain4_mode())
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set_bytes_per_line(get_chars_per_line()<<3);
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else
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/*
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* The V7VGA proprietary text modes fall through here, because the V7 card
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* uses so-called byte-mode for them. This does not affect the PC's
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* view of things, therefore assure that for text modes
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* bytes_per_line = 2 * chars_per_line
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* always holds.
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*/
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if ( is_it_text() )
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set_bytes_per_line(get_chars_per_line()<<1);
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else
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#endif /* V7VGA */
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#ifdef VGG
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/* Caters for the 'undocumented' VGA modes */
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if (get_256_colour_mode())
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set_bytes_per_line(get_chars_per_line()<<1);
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else
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#endif /* VGG */
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set_bytes_per_line(get_chars_per_line());
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/*
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* This is pretty tacky, but...
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*/
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if (video_adapter==EGA || video_adapter == VGA)
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set_screen_length(get_offset_per_line()*get_screen_height()/get_char_height());
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else
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set_screen_length(get_bytes_per_line()*get_screen_height()/get_char_height());
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set_char_width(8);
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}
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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_INIT.seg"
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#endif
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void gvi_init IFN1(half_word, v_adapter)
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{
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int screen_height;
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/*
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* If this is second or subsequent reset, switch off old video adapter
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* ports before initialising new one.
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*/
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if (soft_reset)
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switch (video_adapter) {
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#ifdef DUMB_TERMINAL
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case MDA:
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mda_term();
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break;
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#endif /* DUMB_TERMINAL */
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case CGA:
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#ifdef CGAMONO
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case CGA_MONO:
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#endif
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cga_term();
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break;
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#ifdef EGG
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case EGA:
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ega_term();
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break;
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#endif
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#ifdef VGG
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case VGA:
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vga_term();
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break;
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#endif
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#ifdef HERC
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case HERCULES:
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herc_term();
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break;
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#endif
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default:
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#ifndef PROD
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fprintf(trace_file, "gvi_term: invalid video adaptor: %d\n",
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video_adapter);
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#endif
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break;
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}
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/*
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* Set up GVI variables, depending on v_adapter.
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*/
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switch (v_adapter) {
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case MDA:
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case CGA:
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#ifdef CGAMONO
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case CGA_MONO:
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#endif
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screen_height = CGA_HEIGHT;
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video_adapter = v_adapter;
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break;
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#ifdef HERC
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case HERCULES:
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screen_height = HERC_HEIGHT;
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video_adapter = v_adapter;
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break;
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#endif
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#ifdef EGG
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case EGA:
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screen_height = EGA_HEIGHT;
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video_adapter = v_adapter;
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break;
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#endif
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#ifdef VGG
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case VGA:
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screen_height = VGA_HEIGHT;
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video_adapter = v_adapter;
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break;
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#endif
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default:
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screen_height = CGA_HEIGHT;
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video_adapter = CGA; /* Default video adapter */
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}
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#ifdef GORE
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/*
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* GORE variables must be set up before doing any other
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* graphics.
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*/
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init_gore_update();
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#endif /* GORE */
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/* Setting all these variables should be done in the appropriate xxx_init() */
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switch (video_adapter) {
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#ifdef DUMB_TERMINAL
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case MDA:
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mda_init();
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break;
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#endif /* DUMB_TERMINAL */
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case CGA:
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#ifdef CGAMONO
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case CGA_MONO:
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#endif
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cga_init();
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break;
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#ifdef HERC
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case HERCULES:
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herc_init();
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break;
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#endif
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#ifdef EGG
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case EGA:
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ega_init();
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break;
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#endif
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#ifdef VGG
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case VGA:
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vga_init();
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break;
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#endif
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default:
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break;
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}
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#if !defined(NTVDM) || (defined(NTVDM) && !defined(X86GFX) )
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host_init_adaptor(video_adapter,screen_height);
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host_clear_screen();
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#endif /* !NTVDM | (NTVDM & !X86GFX) */
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#ifdef EGA_DUMP
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dump_init(host_getenv( "EGA_DUMP_FILE" ), video_adapter);
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#endif
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}
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void gvi_term IFN0()
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{
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switch (video_adapter) {
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#ifdef DUMB_TERMINAL
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case MDA:
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mda_term();
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break;
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#endif /* DUMB_TERMINAL */
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case CGA:
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#ifdef CGAMONO
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case CGA_MONO:
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#endif
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cga_term();
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break;
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#ifdef HERC
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case HERCULES:
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herc_term();
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break;
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#endif
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#ifdef EGG
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case EGA:
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ega_term();
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break;
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#endif
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#ifdef VGG
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case VGA:
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vga_term();
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break;
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#endif
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case NO_ADAPTOR: /* Do nothing if video_adaptor not initialised */
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break;
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default:
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#ifndef PROD
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fprintf(trace_file, "gvi_term: invalid video adaptor: %d\n",
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video_adapter);
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#endif
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break;
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}
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#ifdef GORE
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term_gore_update();
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#endif /* GORE */
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}
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