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Top Forums UNIX for Advanced & Expert Users How a windowing system is implemented in C ? Post 302888513 by Corona688 on Friday 14th of February 2014 04:37:40 PM
Old 02-14-2014
Quote:
Originally Posted by coolatt
but my question is at a much lower level how the code accesses the bare graphics card?
Nobody except graphics card manufacturers has programmed graphics cards at the bare metal for over 20 years. If you want the best performance, you use the drivers they make. For UNIX, that mostly means using the drivers they make for X11.

Memory-mapped I/O is often involved, yes.
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gfx_mode_select(3alleg4)					  Allegro manual					  gfx_mode_select(3alleg4)

NAME
gfx_mode_select - Displays the Allegro graphics mode selection dialog. SYNOPSIS
#include <allegro.h> int gfx_mode_select(int *card, int *w, int *h); DESCRIPTION
Displays the Allegro graphics mode selection dialog, which allows the user to select a screen mode and graphics card. The initial values at the addresses provided by card, w, and h are used as the default selections in the dialog if they are found in the driver and mode lists. If they are not found then the initial selections will be the first in each list. If you wish to ensure that the initial selection is always the first entry, then initialize the data at the addresses passed to the function to the value of 0 or -1. If the dialog is OK'd, it stores the selections at the addresses passed to the function. RETURN VALUE
See the gfx_mode_select_filter function for the return values. SEE ALSO
gfx_mode_select_ex(3alleg4), gfx_mode_select_filter(3alleg4), set_gfx_mode(3alleg4), gui_fg_color(3alleg4) Allegro version 4.4.2 gfx_mode_select(3alleg4)
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