quakeforge/libs/video/targets/vid.c

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/*
vid.c
general video driver functions
Copyright (C) 1996-1997 Id Software, Inc.
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to:
Free Software Foundation, Inc.
59 Temple Place - Suite 330
Boston, MA 02111-1307, USA
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
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static __attribute__ ((used)) const char rcsid[] =
"$Id$";
#ifdef HAVE_STRING_H
# include <string.h>
#endif
#ifdef HAVE_STRINGS_H
# include <strings.h>
#endif
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#include <math.h>
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#include "QF/console.h"
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#include "QF/cvar.h"
#include "QF/qargs.h"
#include "QF/sys.h"
#include "QF/va.h"
#include "QF/vid.h"
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#include "compat.h"
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/* Software and hardware gamma support */
VISIBLE byte gammatable[256];
cvar_t *vid_gamma;
cvar_t *vid_system_gamma;
cvar_t *con_width; // FIXME: Try to move with rest of con code
cvar_t *con_height; // FIXME: Try to move with rest of con code
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qboolean vid_gamma_avail; // hardware gamma availability
VISIBLE unsigned int d_8to24table[256];
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/* Screen size */
cvar_t *vid_width;
cvar_t *vid_height;
cvar_t *vid_aspect;
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cvar_t *vid_fullscreen;
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static void
vid_aspect_f (cvar_t *var)
{
const char *p = strchr (var->string, ':');
float w, h;
if (p) {
w = atof (var->string);
h = atof (p + 1);
if (w > 0.0 && h > 0.0) {
var->vec[0] = w;
var->vec[1] = h;
return;
}
}
Sys_Printf ("badly formed aspect ratio: %s. Using default 4:3\n",
var->string);
var->vec[0] = 4.0;
var->vec[1] = 3.0;
}
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void
VID_GetWindowSize (int def_w, int def_h)
{
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int pnum, conheight;
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vid_width = Cvar_Get ("vid_width", va ("%d", def_w), CVAR_NONE, NULL,
"screen width");
vid_height = Cvar_Get ("vid_height", va ("%d", def_h), CVAR_NONE, NULL,
"screen height");
vid_aspect = Cvar_Get ("vid_aspect", "4:3", CVAR_ROM, vid_aspect_f,
"Physical screen aspect ratio in \"width:height\" format. "
"Common values are 4:3, 5:3, 8:5, 16:9, but any width:height "
"measurement will do (eg, 475:296.875 the approximate dimentions "
"in mm of the display area of a certain monitor)");
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if ((pnum = COM_CheckParm ("-width"))) {
if (pnum >= com_argc - 1)
Sys_Error ("VID: -width <width>");
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Cvar_Set (vid_width, com_argv[pnum + 1]);
if (!vid_width->int_val)
Sys_Error ("VID: Bad window width");
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}
if ((pnum = COM_CheckParm ("-height"))) {
if (pnum >= com_argc - 1)
Sys_Error ("VID: -height <height>");
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Cvar_Set (vid_height, com_argv[pnum + 1]);
if (!vid_height->int_val)
Sys_Error ("VID: Bad window height");
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}
if ((pnum = COM_CheckParm ("-winsize"))) {
if (pnum >= com_argc - 2)
Sys_Error ("VID: -winsize <width> <height>");
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Cvar_Set (vid_width, com_argv[pnum + 1]);
Cvar_Set (vid_height, com_argv[pnum + 2]);
if (!vid_width->int_val || !vid_height->int_val)
Sys_Error ("VID: Bad window width/height");
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}
Cvar_SetFlags (vid_width, vid_width->flags | CVAR_ROM);
Cvar_SetFlags (vid_height, vid_height->flags | CVAR_ROM);
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vid.width = vid_width->int_val;
vid.height = vid_height->int_val;
vid.aspect = ((vid_aspect->vec[0] * vid.height)
/ (vid_aspect->vec[1] * vid.width));
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con_width = Cvar_Get ("con_width", va ("%d", vid.width), CVAR_NONE, NULL,
"console effective width (GL only)");
if ((pnum = COM_CheckParm ("-conwidth"))) {
if (pnum >= com_argc - 1)
Sys_Error ("VID: -conwidth <width>");
Cvar_Set (con_width, com_argv[pnum + 1]);
}
// make con_width a multiple of 8 and >= 320
Cvar_Set (con_width, va ("%d", max (con_width->int_val & ~7, 320)));
Cvar_SetFlags (con_width, con_width->flags | CVAR_ROM);
vid.conwidth = con_width->int_val;
conheight = (vid.conwidth * vid_aspect->vec[1]) / vid_aspect->vec[0];
con_height = Cvar_Get ("con_height", va ("%d", conheight), CVAR_NONE, NULL,
"console effective height (GL only)");
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if ((pnum = COM_CheckParm ("-conheight"))) {
if (pnum >= com_argc - 1)
Sys_Error ("VID: -conheight <width>");
Cvar_Set (con_height, com_argv[pnum + 1]);
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}
// make con_height >= 200
Cvar_Set (con_height, va ("%d", max (con_height->int_val, 200)));
Cvar_SetFlags (con_height, con_height->flags | CVAR_ROM);
vid.conheight = con_height->int_val;
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Con_CheckResize (); // Now that we have a window size, fix console
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}
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/* GAMMA FUNCTIONS */
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static void
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VID_BuildGammaTable (double gamma)
{
int i;
if (gamma == 1.0) { // linear, don't bother with the math
for (i = 0; i < 256; i++) {
gammatable[i] = i;
}
} else {
double g = 1.0 / gamma;
int v;
for (i = 0; i < 256; i++) { // Build/update gamma lookup table
v = (int) ((255.0 * pow ((double) i / 255.0, g)) + 0.5);
gammatable[i] = bound (0, v, 255);
}
}
}
/*
VID_UpdateGamma
This is a callback to update the palette or system gamma whenever the
vid_gamma Cvar is changed.
*/
void
VID_UpdateGamma (cvar_t *vid_gamma)
{
double gamma = bound (0.1, vid_gamma->value, 9.9);
vid.recalc_refdef = 1; // force a surface cache flush
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if (vid_gamma_avail && vid_system_gamma->int_val) { // Have system, use it
Sys_MaskPrintf (SYS_VID, "Setting hardware gamma to %g\n", gamma);
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VID_BuildGammaTable (1.0); // hardware gamma wants a linear palette
VID_SetGamma (gamma);
memcpy (vid.palette, vid.basepal, 256 * 3);
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} else { // We have to hack the palette
int i;
Sys_MaskPrintf (SYS_VID, "Setting software gamma to %g\n", gamma);
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VID_BuildGammaTable (gamma);
for (i = 0; i < 256 * 3; i++)
vid.palette[i] = gammatable[vid.basepal[i]];
VID_SetPalette (vid.palette); // update with the new palette
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}
}
/*
VID_InitGamma
Initialize the vid_gamma Cvar, and set up the palette
*/
void
VID_InitGamma (unsigned char *pal)
{
int i;
double gamma = 1.45;
vid.basepal = pal;
vid.palette = malloc (256 * 3);
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if ((i = COM_CheckParm ("-gamma"))) {
gamma = atof (com_argv[i + 1]);
}
gamma = bound (0.1, gamma, 9.9);
vid_gamma = Cvar_Get ("vid_gamma", va ("%f", gamma), CVAR_ARCHIVE,
VID_UpdateGamma, "Gamma correction");
VID_BuildGammaTable (vid_gamma->value);
}