131 lines
8.4 KiB
C
131 lines
8.4 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│vi: set net ft=c ts=8 sts=2 sw=2 fenc=utf-8 :vi│
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2020 Justine Alexandra Roberts Tunney │
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│ │
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│ This program is free software; you can redistribute it and/or modify │
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│ it under the terms of the GNU General Public License as published by │
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│ the Free Software Foundation; version 2 of the License. │
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│ │
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│ This program is distributed in the hope that it will be useful, but │
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│ WITHOUT ANY WARRANTY; without even the implied warranty of │
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│ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU │
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│ General Public License for more details. │
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│ │
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│ You should have received a copy of the GNU General Public License │
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│ along with this program; if not, write to the Free Software │
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│ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA │
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│ 02110-1301 USA │
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╠──────────────────────────────────────────────────────────────────────────────╣
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│░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░▐█▀▀▌░░░▄▀▌░▌░█░▌░░▌░▌░░│
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╠──────────────────────────────────────────────────────▌▀▄─▐──▀▄─▐▄─▐▄▐▄─▐▄─▐▄─│
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│ αcτµαlly pδrταblε εxεcµταblε § pc display helpers │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#ifndef COSMOPOLITAN_LIBC_NEXGEN32E_VIDYA_H_
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#define COSMOPOLITAN_LIBC_NEXGEN32E_VIDYA_H_
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/**
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* @fileoverview PC Display Helpers.
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*
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* These functions provide the baseline of PC graphics & teletype
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* emulation support that doesn't require switching context or cpu mode.
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*
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* @see https://youtu.be/yHXx3orN35Y
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* @see https://youtu.be/H1p1im_2uf4
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* @see Google's SGABIOS which logs MDA/CGA displays to UART as ASCII
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* @mode long,legacy,real
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*/
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#define VIDYA_ROWS 25
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#define VIDYA_COLUMNS 80
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#define VIDYA_SIZE (VIDYA_ROWS * VIDYA_COLUMNS * 2)
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#define VIDYA_MODE_MDA 7
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#define VIDYA_MODE_CGA 3
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#define VIDYA_ADDR_MDA 0xb0000
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#define VIDYA_ADDR_CGA 0xb8000
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#define VIDYA_ATTR_NORMAL 0x07 /* cozy default for both mda and cga */
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#define VIDYA_REWIND ~0x7fff /* derived from mode addr min. lzcnt */
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#define VIDYA_SERVICE 0x10
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#define VIDYA_SET_MODE 0x0003
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#define VIDYA_SET_CURSOR 0x0100
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#define VIDYA_SET_CURSOR_NONE 0x2000
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#define VIDYA_SET_BLINKING 0x1003
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#define VIDYA_SET_BLINKING_NONE 0x0000
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#if !(__ASSEMBLER__ + __LINKER__ + 0)
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enum VidyaMode {
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kVidyaModeMda = VIDYA_MODE_MDA,
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kVidyaModeCga = VIDYA_MODE_CGA
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};
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enum VidyaColor {
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kVidyaColorBlack = 0x0,
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kVidyaColorBlue = 0x1,
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kVidyaColorGreen = 0x2,
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kVidyaColorCyan = 0x3,
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kVidyaColorRed = 0x4,
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kVidyaColorMagenta = 0x5,
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kVidyaColorBrown = 0x6,
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kVidyaColorLightGray = 0x7,
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kVidyaColorDarkGray = 0x8,
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kVidyaColorLightBlue = 0x9,
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kVidyaColorLightGreen = 0xa,
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kVidyaColorLightCyan = 0xb,
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kVidyaColorLightRed = 0xc,
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kVidyaColorLightMagenta = 0xd,
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kVidyaColorYellow = 0xe,
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kVidyaColorWhite = 0xf
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};
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struct thatispacked VidyaCell {
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unsigned glyph : 8; /* IBM Code Page 437 */
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union VidyaAttr {
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enum {
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kVidyaAttrBlank = 0x00,
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kVidyaAttrNormal = VIDYA_ATTR_NORMAL,
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kVidyaAttrMdaFlipped = 0x70,
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kVidyaAttrMdaFlippedFaded = 0x78,
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kVidyaAttrMdaFlippedIntense = 0xf0,
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kVidyaAttrMdaFlippedFadedIntense = 0xf8
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} preset : 8;
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struct VidyaTextDecoration { /* MDA Only */
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unsigned underline : 1;
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unsigned __ignore1 : 1;
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unsigned bold : 1;
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unsigned __ignore2 : 3;
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unsigned intense : 1;
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} decoration;
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struct { /* CGA Only */
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enum VidyaColor fg : 4;
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enum VidyaColor bg : 4;
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} color;
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} attr;
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};
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typedef union VidyaAttr VidyaAttr;
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typedef struct VidyaCell VidyaCell;
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typedef struct VidyaCell VidyaPage[VIDYA_ROWS][VIDYA_COLUMNS];
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__far VidyaPage *vinit(enum VidyaMode mode);
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__far VidyaPage *vcls(__far VidyaCell *pos);
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__far VidyaCell *vputc(__far VidyaCell *pos, int c);
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__far VidyaCell *vputs(__far VidyaCell *pos, const char *str);
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__far VidyaCell *vtput(__far VidyaCell *pos, const void *data, size_t size);
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__far VidyaCell *vscroll(__far VidyaCell *pos, size_t bytes);
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#endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */
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#endif /* COSMOPOLITAN_LIBC_NEXGEN32E_VIDYA_H_ */
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