mirror of https://git.code.sf.net/p/quake/newtree
177 lines
4.1 KiB
C
177 lines
4.1 KiB
C
/*
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vid.c
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general video driver functions
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Copyright (C) 1996-1997 Id Software, Inc.
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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See the GNU General Public License for more details.
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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:
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Free Software Foundation, Inc.
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59 Temple Place - Suite 330
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Boston, MA 02111-1307, USA
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$Id$
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*/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include <math.h>
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#include "compat.h"
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#include "console.h"
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#include "cvar.h"
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#include "qargs.h"
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#include "sys.h"
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#include "va.h"
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#include "vid.h"
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#include "view.h"
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extern viddef_t vid; // global video state
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/*
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Software and hardware gamma support
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*/
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byte gammatable[256];
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cvar_t *vid_gamma;
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cvar_t *vid_system_gamma;
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qboolean vid_gamma_avail; // hardware gamma availability
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/*
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Screen size
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*/
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int scr_width, scr_height;
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cvar_t *vid_width;
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cvar_t *vid_height;
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void
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VID_GetWindowSize (int def_w, int def_h)
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{
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int pnum;
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vid_width = Cvar_Get ("vid_width", va ("%d", def_w), CVAR_NONE, NULL, "screen width");
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vid_height = Cvar_Get ("vid_height", va ("%d", def_h), CVAR_NONE, NULL, "screen height");
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if ((pnum = COM_CheckParm ("-width"))) {
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if (pnum >= com_argc - 1)
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Sys_Error ("VID: -width <width>\n");
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Cvar_Set (vid_width, com_argv[pnum + 1]);
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if (!vid_width->int_val)
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Sys_Error ("VID: Bad window width\n");
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}
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if ((pnum = COM_CheckParm ("-height"))) {
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if (pnum >= com_argc - 1)
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Sys_Error ("VID: -height <height>\n");
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Cvar_Set (vid_height, com_argv[pnum + 1]);
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if (!vid_height->int_val)
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Sys_Error ("VID: Bad window height\n");
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}
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if ((pnum = COM_CheckParm ("-winsize"))) {
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if (pnum >= com_argc - 2)
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Sys_Error ("VID: -winsize <width> <height>\n");
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Cvar_Set (vid_width, com_argv[pnum + 1]);
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Cvar_Set (vid_height, com_argv[pnum + 2]);
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if (!vid_width->int_val || !vid_height->int_val)
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Sys_Error ("VID: Bad window width/height\n");
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}
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Cvar_SetFlags (vid_width, vid_width->flags | CVAR_ROM);
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Cvar_SetFlags (vid_height, vid_height->flags | CVAR_ROM);
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scr_width = vid.width = vid_width->int_val;
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scr_height = vid.height = vid_height->int_val;
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}
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/****************************************************************************
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* GAMMA FUNCTIONS *
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****************************************************************************/
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void
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VID_BuildGammaTable (double gamma)
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{
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int i;
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if (gamma == 1.0) { // linear, don't bother with the math
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for (i = 0; i < 256; i++) {
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gammatable[i] = i;
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}
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} else {
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double g = 1.0 / gamma;
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int v;
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for (i = 0; i < 256; i++) { // Build/update gamma lookup table
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v = (int) ((255.0 * pow ((double) i / 255.0, g)) + 0.5);
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gammatable[i] = bound (0, v, 255);
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}
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}
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}
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/*
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VID_UpdateGamma
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This is a callback to update the palette or system gamma whenever the
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vid_gamma Cvar is changed.
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*/
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void
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VID_UpdateGamma (cvar_t *vid_gamma)
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{
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double gamma = bound (0.1, vid_gamma->value, 9.9);
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if (vid_gamma_avail && vid_system_gamma->int_val) { // Have system, use it
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Con_DPrintf ("Setting hardware gamma to %g\n", gamma);
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VID_BuildGammaTable (1.0); // hardware gamma wants a linear palette
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VID_SetGamma (gamma);
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} else { // We have to hack the palette
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Con_DPrintf ("Setting software gamma to %g\n", gamma);
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VID_BuildGammaTable (gamma);
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V_UpdatePalette (); // update with the new palette
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}
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}
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/*
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VID_InitGamma
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Initialize the vid_gamma Cvar, and set up the palette
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*/
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void
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VID_InitGamma (unsigned char *pal)
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{
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int i;
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double gamma = 1.45;
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if ((i = COM_CheckParm ("-gamma"))) {
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gamma = atof (com_argv[i + 1]);
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}
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gamma = bound (0.1, gamma, 9.9);
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vid_gamma = Cvar_Get ("vid_gamma", va ("%f", gamma), CVAR_ARCHIVE,
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VID_UpdateGamma, "Gamma correction");
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VID_UpdateGamma (vid_gamma);
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for (i = 0; i < 768; i++) {
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pal[i] = gammatable[pal[i]];
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}
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}
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