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Start exploring graphical video modes for VGA console (#637)

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tkchia 2022-10-02 16:50:16 +08:00 • committed by GitHub
parent 304cf8869c
commit ecb2ef7c39
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8 changed files with 964 additions and 70 deletions
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52
libc/vga/vga.internal.h
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@ -1,22 +1,21 @@
#ifndef COSMOPOLITAN_LIBC_VGA_VGA_INTERNAL_H_
#define COSMOPOLITAN_LIBC_VGA_VGA_INTERNAL_H_
/** Preferred width of the video screen, in character units. */
#define VGA_PREFER_TTY_HEIGHT 30
/** Preferred width of the video screen, in character units. */
#define VGA_PREFER_TTY_WIDTH 80
/** Assumed height of each character in pixels, in graphics modes. */
#define VGA_ASSUME_CHAR_HEIGHT_PX 16
/** Assumed width of each character in pixels, in graphics modes. */
#define VGA_ASSUME_CHAR_WIDTH_PX 8
/*
* VGA_TTY_HEIGHT, VGA_TTY_WIDTH, VGA_USE_WCS, & VGA_PERSNICKETY_STATUS are
* configuration knobs which can potentially be used to tweak the features
* to be compiled into our VGA teletypewriter support.
* VGA_USE_WCS, VGA_USE_BLINK, & VGA_PERSNICKETY_STATUS are configuration
* knobs which can potentially be used to tweak the features to be compiled
* into our VGA teletypewriter support.
*/
/**
* Height of the video screen, in character units. Undefine if the height
* may vary at runtime.
*/
#define VGA_TTY_HEIGHT 25
/**
* Width of the video screen, in character units. Undefine if the width may
* vary at runtime.
*/
#define VGA_TTY_WIDTH 80
/**
* If VGA_USE_WCS is defined, the tty code can maintain an array of the
* Unicode characters "underlying" the 8-bit (or 9-bit) characters that are
@ -113,13 +112,22 @@ struct VgaTextCharCell {
};
struct Tty {
/**
* Cursor position. (y, x) = (0, 0) means the cursor is on the top left
* character cell of the terminal.
*/
unsigned short y, x;
#ifndef VGA_TTY_HEIGHT
unsigned short yn;
#endif
#ifndef VGA_TTY_WIDTH
unsigned short xn;
#endif
/** Height and width of terminal, in character units. */
unsigned short yn, xn;
/** Height and width of terminal, in pixels (if in graphics video mode). */
unsigned short yp, xp;
/**
* Number of bytes (NOTE) occupied by each row of pixels, including any
* invisible "pixels".
*/
unsigned short xs;
/** Type of video buffer (from mman::pc_video_type). */
unsigned char type;
uint32_t u8;
uint32_t n8;
uint32_t pr;
@ -155,8 +163,10 @@ ssize_t _TtyWrite(struct Tty *, const void *, size_t);
ssize_t _TtyWriteInput(struct Tty *, const void *, size_t);
void _TtyResetOutputMode(struct Tty *);
void _TtyFullReset(struct Tty *);
void _TtyMemmove(struct Tty *, size_t, size_t, size_t);
void _TtyErase(struct Tty *, size_t, size_t);
void _TtyMoveLineCells(struct Tty *, size_t, size_t, size_t, size_t, size_t);
void _TtyMoveLines(struct Tty *, size_t, size_t, size_t);
void _TtyEraseLineCells(struct Tty *, size_t, size_t, size_t);
void _TtyEraseLines(struct Tty *, size_t, size_t);
void _TtySetY(struct Tty *, unsigned short);
void _TtySetX(struct Tty *, unsigned short);