343 lines
7.0 KiB
C
343 lines
7.0 KiB
C
/*
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Copyright (C) 1996-2001 Id Software, Inc.
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Copyright (C) 2002-2009 John Fitzgibbons and others
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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 the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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//gl_fog.c -- global and volumetric fog
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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static __attribute__ ((used)) const char rcsid[] = "$Id$";
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#ifdef HAVE_STRING_H
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# include <string.h>
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#endif
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#ifdef HAVE_STRINGS_H
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# include <strings.h>
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#endif
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#include "QF/cmd.h"
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#include "QF/qfplist.h"
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#include "QF/render.h"
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#include "QF/sys.h"
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#include "QF/GL/defines.h"
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#include "QF/GL/funcs.h"
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#include "compat.h"
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#include "r_shared.h"
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//==============================================================================
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//
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// GLOBAL FOG
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//
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//==============================================================================
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static float fog_density;
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static float fog_red;
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static float fog_green;
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static float fog_blue;
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static float old_density;
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static float old_red;
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static float old_green;
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static float old_blue;
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static float fade_time; //duration of fade
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static float fade_done; //time when fade will be done
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/*
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Fog_Update
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update internal variables
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*/
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void
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Fog_Update (float density, float red, float green, float blue, float time)
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{
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//save previous settings for fade
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if (time > 0) {
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//check for a fade in progress
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if (fade_done > r_realtime) {
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float f;
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f = (fade_done - r_realtime) / fade_time;
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old_density = f * old_density + (1.0 - f) * fog_density;
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old_red = f * old_red + (1.0 - f) * fog_red;
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old_green = f * old_green + (1.0 - f) * fog_green;
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old_blue = f * old_blue + (1.0 - f) * fog_blue;
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} else {
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old_density = fog_density;
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old_red = fog_red;
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old_green = fog_green;
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old_blue = fog_blue;
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}
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}
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fog_density = density;
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fog_red = red;
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fog_green = green;
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fog_blue = blue;
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fade_time = time;
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fade_done = r_realtime + time;
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}
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/*
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Fog_FogCommand_f
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handle the 'fog' console command
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*/
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static void
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Fog_FogCommand_f (void)
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{
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switch (Cmd_Argc ()) {
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default:
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case 1:
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Sys_Printf ("usage:\n");
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Sys_Printf (" fog <density>\n");
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Sys_Printf (" fog <red> <green> <blue>\n");
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Sys_Printf (" fog <density> <red> <green> <blue>\n");
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Sys_Printf ("current values:\n");
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Sys_Printf (" \"density\" is \"%f\"\n", fog_density);
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Sys_Printf (" \"red\" is \"%f\"\n", fog_red);
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Sys_Printf (" \"green\" is \"%f\"\n", fog_green);
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Sys_Printf (" \"blue\" is \"%f\"\n", fog_blue);
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break;
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case 2:
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Fog_Update (max (0.0, atof (Cmd_Argv (1))),
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fog_red, fog_green, fog_blue, 0.0);
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break;
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case 3: //TEST
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Fog_Update (max (0.0, atof (Cmd_Argv (1))),
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fog_red, fog_green, fog_blue, atof (Cmd_Argv (2)));
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break;
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case 4:
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Fog_Update (fog_density,
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bound (0.0, atof (Cmd_Argv (1)), 1.0),
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bound (0.0, atof (Cmd_Argv (2)), 1.0),
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bound (0.0, atof (Cmd_Argv (3)), 1.0),
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0.0);
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break;
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case 5:
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Fog_Update (max (0.0, atof (Cmd_Argv (1))),
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bound (0.0, atof (Cmd_Argv (2)), 1.0),
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bound (0.0, atof (Cmd_Argv (3)), 1.0),
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bound (0.0, atof (Cmd_Argv (4)), 1.0),
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0.0);
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break;
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case 6: //TEST
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Fog_Update (max (0.0, atof (Cmd_Argv (1))),
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bound (0.0, atof (Cmd_Argv (2)), 1.0),
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bound (0.0, atof (Cmd_Argv (3)), 1.0),
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bound (0.0, atof (Cmd_Argv (4)), 1.0),
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atof (Cmd_Argv (5)));
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break;
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}
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}
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/*
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Fog_ParseWorldspawn
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called at map load
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*/
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void
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Fog_ParseWorldspawn (plitem_t *worldspawn)
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{
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plitem_t *fog;
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const char *value;
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//initially no fog
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fog_density = 0.0;
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old_density = 0.0;
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fade_time = 0.0;
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fade_done = 0.0;
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if (!worldspawn)
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return; // error
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if ((fog = PL_ObjectForKey (worldspawn, "fog"))
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&& (value = PL_String (fog))) {
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sscanf (value, "%f %f %f %f", &fog_density,
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&fog_red, &fog_green, &fog_blue);
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}
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}
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/*
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Fog_GetColor
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calculates fog color for this frame, taking into account fade times
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*/
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float *
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Fog_GetColor (void)
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{
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static float c[4];
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float f;
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int i;
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if (fade_done > r_realtime) {
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f = (fade_done - r_realtime) / fade_time;
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c[0] = f * old_red + (1.0 - f) * fog_red;
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c[1] = f * old_green + (1.0 - f) * fog_green;
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c[2] = f * old_blue + (1.0 - f) * fog_blue;
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c[3] = 1.0;
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} else {
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c[0] = fog_red;
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c[1] = fog_green;
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c[2] = fog_blue;
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c[3] = 1.0;
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}
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//find closest 24-bit RGB value, so solid-colored sky can match the fog
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//perfectly
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for (i = 0; i < 3; i++)
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c[i] = (float) (rint (c[i] * 255)) / 255.0f;
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return c;
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}
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/*
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Fog_GetDensity
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returns current density of fog
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*/
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float
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Fog_GetDensity (void)
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{
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float f;
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if (fade_done > r_realtime) {
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f = (fade_done - r_realtime) / fade_time;
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return f * old_density + (1.0 - f) * fog_density;
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} else {
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return fog_density;
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}
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}
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/*
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Fog_SetupFrame
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called at the beginning of each frame
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*/
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void
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Fog_SetupFrame (void)
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{
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qfglFogfv (GL_FOG_COLOR, Fog_GetColor ());
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qfglFogf (GL_FOG_DENSITY, Fog_GetDensity () / 64.0);
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}
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/*
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Fog_EnableGFog
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called before drawing stuff that should be fogged
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*/
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void
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Fog_EnableGFog (void)
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{
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if (Fog_GetDensity () > 0)
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qfglEnable (GL_FOG);
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}
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/*
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Fog_DisableGFog
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called after drawing stuff that should be fogged
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*/
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void
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Fog_DisableGFog (void)
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{
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if (Fog_GetDensity () > 0)
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qfglDisable (GL_FOG);
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}
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/*
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Fog_StartAdditive
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called before drawing stuff that is additive blended -- sets fog color
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to black
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*/
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void
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Fog_StartAdditive (void)
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{
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vec3_t color = {0, 0, 0};
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if (Fog_GetDensity () > 0)
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qfglFogfv (GL_FOG_COLOR, color);
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}
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/*
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Fog_StopAdditive
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called after drawing stuff that is additive blended -- restores fog color
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*/
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void Fog_StopAdditive (void)
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{
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if (Fog_GetDensity () > 0)
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qfglFogfv (GL_FOG_COLOR, Fog_GetColor ());
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}
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//==============================================================================
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//
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// VOLUMETRIC FOG
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//
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//==============================================================================
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//cvar_t r_vfog = {"r_vfog", "1"};
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//void Fog_DrawVFog (void) {}
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//void Fog_MarkModels (void) {}
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//==============================================================================
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//
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// INIT
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//
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//==============================================================================
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/*
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Fog_NewMap
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called whenever a map is loaded
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*/
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#if 0
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void
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Fog_NewMap (void)
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{
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Fog_ParseWorldspawn (); //for global fog
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Fog_MarkModels (); //for volumetric fog
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}
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#endif
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/*
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Fog_Init
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called when quake initializes
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*/
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void
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Fog_Init (void)
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{
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Cmd_AddCommand ("fog", Fog_FogCommand_f, "");
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//Cvar_RegisterVariable (&r_vfog, NULL);
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//set up global fog
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fog_density = 0.0;
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fog_red = 0.3;
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fog_green = 0.3;
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fog_blue = 0.3;
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qfglFogi (GL_FOG_MODE, GL_EXP2);
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}
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