/usr/include/allegro/internal/aintvga.h is in liballegro4-dev 2:4.4.2-7.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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* /\ _ \ /\_ \ /\_ \
* \ \ \L\ \\//\ \ \//\ \ __ __ _ __ ___
* \ \ __ \ \ \ \ \ \ \ /'__`\ /'_ `\/\`'__\/ __`\
* \ \ \/\ \ \_\ \_ \_\ \_/\ __//\ \L\ \ \ \//\ \L\ \
* \ \_\ \_\/\____\/\____\ \____\ \____ \ \_\\ \____/
* \/_/\/_/\/____/\/____/\/____/\/___L\ \/_/ \/___/
* /\____/
* \_/__/
*
* Helpers for accessing the VGA hardware registers.
*
* By Shawn Hargreaves.
*
* See readme.txt for copyright information.
*/
#ifndef AINTVGA_H
#define AINTVGA_H
#ifndef ALLEGRO_H
#error must include allegro.h first
#endif
#ifdef ALLEGRO_GFX_HAS_VGA
#ifdef __cplusplus
extern "C" {
#endif
AL_VAR(int, _crtc);
AL_FUNC(void, _vga_regs_init, (void));
AL_FUNC(void, _vga_vsync, (void));
AL_FUNC(void, _vga_set_palette_range, (AL_CONST PALETTE p, int from, int to, int do_sync));
AL_FUNC(void, _set_vga_virtual_width, (int old_width, int new_width));
AL_FUNC(uintptr_t, _set_vga_mode, (int modenum));
AL_FUNC(void, _unset_vga_mode, (void));
AL_FUNC(void, _save_vga_mode, (void));
AL_FUNC(void, _restore_vga_mode, (void));
/* reads the current value of a VGA hardware register */
AL_INLINE(int, _read_vga_register, (int port, int idx),
{
if (port==0x3C0)
inportb(_crtc+6);
outportb(port, idx);
return inportb(port+1);
})
/* writes to a VGA hardware register */
AL_INLINE(void, _write_vga_register, (int port, int idx, int v),
{
if (port==0x3C0) {
inportb(_crtc+6);
outportb(port, idx);
outportb(port, v);
}
else {
outportb(port, idx);
outportb(port+1, v);
}
})
/* alters specific bits of a VGA hardware register */
AL_INLINE(void, _alter_vga_register, (int port, int idx, int mask, int v),
{
int temp;
temp = _read_vga_register(port, idx);
temp &= (~mask);
temp |= (v & mask);
_write_vga_register(port, idx, temp);
})
/* waits until the VGA isn't in a horizontal blank */
AL_INLINE(void, _vsync_out_h, (void),
{
do {
} while (inportb(0x3DA) & 1);
})
/* waits until the VGA isn't in a vertical blank */
AL_INLINE(void, _vsync_out_v, (void),
{
do {
} while (inportb(0x3DA) & 8);
})
/* waits until the VGA is in a vertical blank */
AL_INLINE(void, _vsync_in, (void),
{
if (_timer_use_retrace) {
int t = retrace_count;
do {
} while (t == retrace_count);
}
else {
do {
} while (!(inportb(0x3DA) & 8));
}
})
/* modifies the VGA pelpan register */
AL_INLINE(void, _write_hpp, (int value),
{
if (_timer_use_retrace) {
_retrace_hpp_value = value;
do {
} while (_retrace_hpp_value == value);
}
else {
do {
} while (!(inportb(0x3DA) & 8));
_write_vga_register(0x3C0, 0x33, value);
}
})
#ifdef __cplusplus
}
#endif
#endif /* ifdef ALLEGRO_GFX_HAS_VGA */
#endif /* ifndef AINTVGA_H */
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