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https://git.code.sf.net/p/quake/quakeforge
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5cd24de097
build. Look at their vid files, as well as vid_common_{gl,sw}.c to find
out what will need to be added to the rest of the video targets.
133 lines
3 KiB
C
133 lines
3 KiB
C
/*
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vid_common_sw.c
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Common software video driver functions
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Copyright (C) 2001 Jeff Teunissen <deek@quakeforge.net>
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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 "QF/cvar.h"
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#include "QF/compat.h"
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#include "QF/qargs.h"
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#include "vid.h"
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#include "view.h"
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extern byte gammatable[256];
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extern cvar_t *vid_system_gamma;
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extern qboolean vid_gamma_avail; // hardware gamma availability
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cvar_t *vid_gamma;
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/*
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VID_InitGamma
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Initialize the gamma lookup table
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This function is less complex than the GL version.
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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;
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vid_gamma = Cvar_Get ("vid_gamma", "1.45", CVAR_ARCHIVE, VID_UpdateGamma,
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"Gamma correction");
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if ((i = COM_CheckParm ("-gamma"))) {
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gamma = atof (com_argv[i + 1]);
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} else {
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gamma = vid_gamma->value;
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}
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gamma = bound (0.1, gamma, 9.9);
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Cvar_SetValue (vid_gamma, gamma);
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if (gamma == 1.0) { // screw the math, 1.0 is linear
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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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if (vid_system_gamma->int_val) {
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VID_SetGamma (gamma);
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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++) { // Create the gamma-correction 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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for (i = 0; i < 768; i++) { // correct the palette
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pal[i] = gammatable[pal[i]];
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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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int i;
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if (vid_gamma->flags & CVAR_ROM) // System gamma unavailable
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return;
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Cvar_SetValue (vid_gamma, bound (0.1, vid_gamma->value, 9.9));
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if (vid_gamma_avail && vid_system_gamma->int_val) { // Have sys gamma, use it
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for (i = 0; i < 256; i++) { // linear, to keep things kosher
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gammatable[i] = i;
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}
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VID_SetGamma (vid_gamma->value);
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} else { // We have to hack the palette
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if (vid_gamma->value == 1.0) { // screw the math, 1.0 is linear
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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 / vid_gamma->value;
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int v;
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for (i = 0; i < 256; i++) { // Update the gamma LUT
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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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V_UpdatePalette (); // update with the new palette
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}
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}
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