mirror of
https://git.code.sf.net/p/quake/quakeforge
synced 2024-11-05 20:50:43 +00:00
338 lines
8 KiB
C
338 lines
8 KiB
C
/*
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gl_sky.c
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sky polygons
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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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#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 "console.h"
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#include "glquake.h"
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#include "tga.h"
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#include "view.h"
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extern double realtime;
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extern model_t *loadmodel;
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extern int skytexturenum;
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extern qboolean lighthalf;
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int solidskytexture;
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int alphaskytexture;
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float speedscale; // for top sky and bottom sky
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// Set to true if a valid skybox is loaded --KB
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qboolean skyloaded = false;
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/*
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R_LoadSkys
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*/
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char *suf[6] = { "rt", "bk", "lf", "ft", "up", "dn" };
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void
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R_LoadSkys (char *skyname)
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{
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int i;
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QFile *f;
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char name[64];
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if (strcasecmp (skyname, "none") == 0) {
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skyloaded = false;
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return;
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}
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skyloaded = true;
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for (i = 0; i < 6; i++) {
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byte *targa_rgba;
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glBindTexture (GL_TEXTURE_2D, SKY_TEX + i);
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snprintf (name, sizeof (name), "env/%s%s.tga", skyname, suf[i]);
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COM_FOpenFile (name, &f);
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if (!f) {
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Con_DPrintf ("Couldn't load %s\n", name);
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skyloaded = false;
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continue;
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}
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targa_rgba = LoadTGA (f);
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glTexImage2D (GL_TEXTURE_2D, 0, gl_solid_format, 256, 256, 0, GL_RGBA,
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GL_UNSIGNED_BYTE, targa_rgba);
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free (targa_rgba);
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glTexParameterf (GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
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glTexParameterf (GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
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}
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if (!skyloaded)
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Con_Printf ("Unable to load skybox %s, using normal sky\n", skyname);
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}
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void
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R_SkyBoxPolyVec (vec5_t v)
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{
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// avoid interpolation seams
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// s = s * (254.0/256.0) + (1.0/256.0);
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// t = t * (254.0/256.0) + (1.0/256.0);
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glTexCoord2fv (v);
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glVertex3f (r_refdef.vieworg[0] + v[2],
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r_refdef.vieworg[1] + v[3], r_refdef.vieworg[2] + v[4]);
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}
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#define ftc(x) (x * (254.0/256.0) + (1.0/256.0))
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vec5_t skyvec[6][4] = {
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{
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// right +y
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{ftc (1), ftc (0), 1024, 1024, 1024},
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{ftc (1), ftc (1), 1024, 1024, -1024},
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{ftc (0), ftc (1), -1024, 1024, -1024},
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{ftc (0), ftc (0), -1024, 1024, 1024}
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},
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{
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// back -x
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{ftc (1), ftc (0), -1024, 1024, 1024},
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{ftc (1), ftc (1), -1024, 1024, -1024},
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{ftc (0), ftc (1), -1024, -1024, -1024},
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{ftc (0), ftc (0), -1024, -1024, 1024}
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},
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{
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// left -y
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{ftc (1), ftc (0), -1024, -1024, 1024},
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{ftc (1), ftc (1), -1024, -1024, -1024},
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{ftc (0), ftc (1), 1024, -1024, -1024},
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{ftc (0), ftc (0), 1024, -1024, 1024}
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},
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{
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// front +x
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{ftc (1), ftc (0), 1024, -1024, 1024},
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{ftc (1), ftc (1), 1024, -1024, -1024},
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{ftc (0), ftc (1), 1024, 1024, -1024},
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{ftc (0), ftc (0), 1024, 1024, 1024}
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},
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{
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// up +z
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{ftc (1), ftc (0), 1024, -1024, 1024},
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{ftc (1), ftc (1), 1024, 1024, 1024},
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{ftc (0), ftc (1), -1024, 1024, 1024},
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{ftc (0), ftc (0), -1024, -1024, 1024}
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},
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{
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// down -z
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{ftc (1), ftc (0), 1024, 1024, -1024},
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{ftc (1), ftc (1), 1024, -1024, -1024},
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{ftc (0), ftc (1), -1024, -1024, -1024},
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{ftc (0), ftc (0), -1024, 1024, -1024}
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}
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};
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#undef ftc
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void
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R_DrawSkyBox (void)
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{
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int i, j;
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glDisable (GL_DEPTH_TEST);
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glDepthRange (gldepthmax, gldepthmax);
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for (i = 0; i < 6; i++) {
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glBindTexture (GL_TEXTURE_2D, SKY_TEX + i);
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glBegin (GL_QUADS);
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for (j = 0; j < 4; j++)
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R_SkyBoxPolyVec (skyvec[i][j]);
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glEnd ();
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}
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glEnable (GL_DEPTH_TEST);
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glDepthRange (gldepthmin, gldepthmax);
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}
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vec3_t domescale;
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void
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R_DrawSkyLayer (float s)
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{
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int a, b;
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float x, y, a1x, a1y, a2x, a2y;
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vec3_t v;
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for (a = 0; a < 16; a++) {
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a1x = bubble_costable[a * 2] * domescale[0];
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a1y = -bubble_sintable[a * 2] * domescale[1];
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a2x = bubble_costable[(a + 1) * 2] * domescale[0];
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a2y = -bubble_sintable[(a + 1) * 2] * domescale[1];
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glBegin (GL_TRIANGLE_STRIP);
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glTexCoord2f (0.5 + s * (1.0 / 128.0), 0.5 + s * (1.0 / 128.0));
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glVertex3f (r_refdef.vieworg[0],
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r_refdef.vieworg[1], r_refdef.vieworg[2] + domescale[2]);
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for (b = 1; b < 8; b++) {
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x = bubble_costable[b * 2 + 16];
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y = -bubble_sintable[b * 2 + 16];
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v[0] = a1x * x;
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v[1] = a1y * x;
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v[2] = y * domescale[2];
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glTexCoord2f ((v[0] + s) * (1.0 / 128.0),
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(v[1] + s) * (1.0 / 128.0));
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glVertex3f (v[0] + r_refdef.vieworg[0],
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v[1] + r_refdef.vieworg[1], v[2] + r_refdef.vieworg[2]);
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v[0] = a2x * x;
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v[1] = a2y * x;
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v[2] = y * domescale[2];
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glTexCoord2f ((v[0] + s) * (1.0 / 128.0),
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(v[1] + s) * (1.0 / 128.0));
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glVertex3f (v[0] + r_refdef.vieworg[0],
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v[1] + r_refdef.vieworg[1], v[2] + r_refdef.vieworg[2]);
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}
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glTexCoord2f (0.5 + s * (1.0 / 128.0), 0.5 + s * (1.0 / 128.0));
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glVertex3f (r_refdef.vieworg[0],
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r_refdef.vieworg[1], r_refdef.vieworg[2] - domescale[2]);
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glEnd ();
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}
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}
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void
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R_DrawSkyDome (void)
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{
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glDisable (GL_DEPTH_TEST);
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glDepthRange (gldepthmax, gldepthmax);
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glDisable (GL_BLEND);
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// base sky
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glBindTexture (GL_TEXTURE_2D, solidskytexture);
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domescale[0] = 512;
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domescale[1] = 512;
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domescale[2] = 128;
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speedscale = realtime * 8;
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speedscale -= (int) speedscale & ~127;
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R_DrawSkyLayer (speedscale);
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glEnable (GL_BLEND);
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// clouds
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if (gl_skymultipass->int_val) {
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glBindTexture (GL_TEXTURE_2D, alphaskytexture);
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domescale[0] = 512;
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domescale[1] = 512;
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domescale[2] = 128;
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speedscale = realtime * 16;
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speedscale -= (int) speedscale & ~127;
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R_DrawSkyLayer (speedscale);
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}
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glEnable (GL_DEPTH_TEST);
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glDepthRange (gldepthmin, gldepthmax);
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}
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void
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R_DrawSky (void)
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{
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float l = 1 / (256 * brightness->value);
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glColor3f (lighthalf_v[0] * l, lighthalf_v[1] * l, lighthalf_v[2] * l);
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if (skyloaded)
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R_DrawSkyBox ();
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else
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R_DrawSkyDome ();
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glColor3ubv (lighthalf_v);
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}
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//===============================================================
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/*
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R_InitSky
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A sky texture is 256*128, with the right side being a masked overlay
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*/
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void
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R_InitSky (texture_t *mt)
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{
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int i, j, p;
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byte *src;
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unsigned int trans[128 * 128];
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unsigned int transpix;
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int r, g, b;
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unsigned int *rgba;
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src = (byte *) mt + mt->offsets[0];
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// make an average value for the back to avoid
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// a fringe on the top level
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r = g = b = 0;
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for (i = 0; i < 128; i++)
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for (j = 0; j < 128; j++) {
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p = src[i * 256 + j + 128];
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rgba = &d_8to24table[p];
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trans[(i * 128) + j] = *rgba;
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r += ((byte *) rgba)[0];
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g += ((byte *) rgba)[1];
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b += ((byte *) rgba)[2];
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}
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((byte *) & transpix)[0] = r / (128 * 128);
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((byte *) & transpix)[1] = g / (128 * 128);
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((byte *) & transpix)[2] = b / (128 * 128);
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((byte *) & transpix)[3] = 0;
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if (!solidskytexture)
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solidskytexture = texture_extension_number++;
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glBindTexture (GL_TEXTURE_2D, solidskytexture);
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glTexImage2D (GL_TEXTURE_2D, 0, gl_solid_format, 128, 128, 0, GL_RGBA,
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GL_UNSIGNED_BYTE, trans);
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glTexParameterf (GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
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glTexParameterf (GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
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for (i = 0; i < 128; i++)
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for (j = 0; j < 128; j++) {
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p = src[i * 256 + j];
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if (p == 0)
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trans[(i * 128) + j] = transpix;
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else
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trans[(i * 128) + j] = d_8to24table[p];
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}
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if (!alphaskytexture)
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alphaskytexture = texture_extension_number++;
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glBindTexture (GL_TEXTURE_2D, alphaskytexture);
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glTexImage2D (GL_TEXTURE_2D, 0, gl_alpha_format, 128, 128, 0, GL_RGBA,
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GL_UNSIGNED_BYTE, trans);
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glTexParameterf (GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
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glTexParameterf (GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
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}
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