mirror of https://git.code.sf.net/p/quake/newtree
435 lines
9.3 KiB
C
435 lines
9.3 KiB
C
/*
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gl_rlight.c
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(description)
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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 <math.h>
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#include <stdio.h>
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#include "glquake.h"
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int r_dlightframecount;
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extern qboolean lighthalf;
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/*
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R_AnimateLight
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*/
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void
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R_AnimateLight (void)
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{
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int i, j, k;
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//
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// light animations
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// 'm' is normal light, 'a' is no light, 'z' is double bright
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i = (int) (cl.time * 10);
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for (j = 0; j < MAX_LIGHTSTYLES; j++) {
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if (!cl_lightstyle[j].length) {
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d_lightstylevalue[j] = 256;
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continue;
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}
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k = i % cl_lightstyle[j].length;
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k = cl_lightstyle[j].map[k] - 'a';
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k = k * 22;
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d_lightstylevalue[j] = k;
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}
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}
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/*
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DYNAMIC LIGHTS BLEND RENDERING
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*/
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void
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AddLightBlend (float r, float g, float b, float a2)
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{
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float a;
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v_blend[3] = a = v_blend[3] + a2 * (1 - v_blend[3]);
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a2 = a2 / a;
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v_blend[0] = v_blend[0] * (1 - a2) + r * a2;
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v_blend[1] = v_blend[1] * (1 - a2) + g * a2;
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v_blend[2] = v_blend[2] * (1 - a2) + b * a2;
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//Con_Printf("AddLightBlend(): %4.2f %4.2f %4.2f %4.6f\n", v_blend[0], v_blend[1], v_blend[2], v_blend[3]);
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}
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float bubble_sintable[33], bubble_costable[33];
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void
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R_InitBubble ()
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{
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int i;
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float a;
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float *bub_sin, *bub_cos;
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bub_sin = bubble_sintable;
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bub_cos = bubble_costable;
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for (i = 32; i >= 0; i--) {
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a = i / 32.0 * M_PI * 2;
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*bub_sin++ = sin (a);
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*bub_cos++ = cos (a);
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}
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}
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void
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R_RenderDlight (dlight_t *light)
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{
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int i, j;
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vec3_t v;
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float rad;
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float *bub_sin, *bub_cos;
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bub_sin = bubble_sintable;
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bub_cos = bubble_costable;
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rad = light->radius * 0.35;
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VectorSubtract (light->origin, r_origin, v);
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if (Length (v) < rad) { // view is inside the dlight
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return;
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}
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glBegin (GL_TRIANGLE_FAN);
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if (lighthalf)
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glColor3f (light->color[0] * 0.5, light->color[1] * 0.5,
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light->color[2] * 0.5);
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else
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glColor3fv (light->color);
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VectorSubtract (r_origin, light->origin, v);
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VectorNormalize (v);
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for (i = 0; i < 3; i++)
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v[i] = light->origin[i] + v[i] * rad;
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glVertex3fv (v);
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glColor3f (0, 0, 0);
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for (i = 16; i >= 0; i--) {
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for (j = 0; j < 3; j++)
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v[j] = light->origin[j] + (vright[j] * (*bub_cos) +
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vup[j] * (*bub_sin)) * rad;
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bub_sin += 2;
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bub_cos += 2;
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glVertex3fv (v);
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}
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glEnd ();
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// Don't glColor3ubv(lighthalf_v), as we reset in the function which
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// calls this one, because this is called in a big loop.
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}
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/*
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R_RenderDlights
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*/
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void
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R_RenderDlights (void)
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{
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int i;
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dlight_t *l;
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if (!gl_dlight_polyblend->int_val)
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return;
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r_dlightframecount = r_framecount + 1; // because the count hasn't
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// advanced yet for this frame
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glDepthMask (GL_FALSE);
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glDisable (GL_TEXTURE_2D);
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glBlendFunc (GL_ONE, GL_ONE);
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glShadeModel (GL_SMOOTH);
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l = cl_dlights;
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for (i = 0; i < MAX_DLIGHTS; i++, l++) {
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if (l->die < cl.time || !l->radius)
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continue;
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R_RenderDlight (l);
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}
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if (!gl_dlight_smooth->int_val)
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glShadeModel (GL_FLAT);
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glColor3ubv (lighthalf_v);
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glEnable (GL_TEXTURE_2D);
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glBlendFunc (GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
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glDepthMask (GL_TRUE);
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}
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/*
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DYNAMIC LIGHTS
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*/
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/*
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R_MarkLights
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*/
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// LordHavoc: heavily modified, to eliminate unnecessary texture uploads,
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// and support bmodel lighting better
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void
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R_MarkLights (vec3_t lightorigin, dlight_t *light, int bit, mnode_t *node)
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{
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mplane_t *splitplane;
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float dist, l, maxdist;
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msurface_t *surf;
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int i, j, s, t;
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vec3_t impact;
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if (node->contents < 0)
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return;
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splitplane = node->plane;
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dist = DotProduct (lightorigin, splitplane->normal) - splitplane->dist;
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if (dist > light->radius) {
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if (node->children[0]->contents >= 0) // save some time by not
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// pushing another stack
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// frame
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R_MarkLights (lightorigin, light, bit, node->children[0]);
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return;
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}
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if (dist < -light->radius) {
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if (node->children[1]->contents >= 0) // save some time by not
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// pushing another stack
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// frame
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R_MarkLights (lightorigin, light, bit, node->children[1]);
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return;
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}
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maxdist = light->radius * light->radius;
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// mark the polygons
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surf = cl.worldmodel->surfaces + node->firstsurface;
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for (i = 0; i < node->numsurfaces; i++, surf++) {
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// LordHavoc: MAJOR dynamic light speedup here, eliminates marking of
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// surfaces that are too far away from light, thus preventing
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// unnecessary renders and uploads
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for (j = 0; j < 3; j++)
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impact[j] = lightorigin[j] - surf->plane->normal[j] * dist;
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// clamp center of light to corner and check brightness
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l =
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DotProduct (impact,
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surf->texinfo->vecs[0]) + surf->texinfo->vecs[0][3] -
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surf->texturemins[0];
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s = l + 0.5;
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if (s < 0)
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s = 0;
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else if (s > surf->extents[0])
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s = surf->extents[0];
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s = l - s;
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l =
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DotProduct (impact,
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surf->texinfo->vecs[1]) + surf->texinfo->vecs[1][3] -
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surf->texturemins[1];
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t = l + 0.5;
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if (t < 0)
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t = 0;
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else if (t > surf->extents[1])
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t = surf->extents[1];
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t = l - t;
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// compare to minimum light
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if ((s * s + t * t + dist * dist) < maxdist) {
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if (surf->dlightframe != r_dlightframecount) // not dynamic
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// until now
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{
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surf->dlightbits = bit;
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surf->dlightframe = r_dlightframecount;
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} else // already dynamic
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surf->dlightbits |= bit;
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}
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}
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if (node->children[0]->contents >= 0) // save some time by not pushing
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// another stack frame
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R_MarkLights (lightorigin, light, bit, node->children[0]);
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if (node->children[1]->contents >= 0) // save some time by not pushing
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// another stack frame
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R_MarkLights (lightorigin, light, bit, node->children[1]);
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}
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/*
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R_PushDlights
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*/
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void
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R_PushDlights (vec3_t entorigin)
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{
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int i;
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dlight_t *l;
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vec3_t lightorigin;
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if (!gl_dlight_lightmap->int_val)
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return;
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r_dlightframecount = r_framecount + 1; // because the count hasn't
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// advanced yet for this frame
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l = cl_dlights;
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for (i = 0; i < MAX_DLIGHTS; i++, l++) {
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if (l->die < cl.time || !l->radius)
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continue;
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VectorSubtract (l->origin, entorigin, lightorigin);
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R_MarkLights (lightorigin, l, 1 << i, cl.worldmodel->nodes);
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}
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}
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/*
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LIGHT SAMPLING
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*/
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mplane_t *lightplane;
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vec3_t lightspot;
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int
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RecursiveLightPoint (mnode_t *node, vec3_t start, vec3_t end)
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{
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int r;
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float front, back, frac;
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int side;
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mplane_t *plane;
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vec3_t mid;
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msurface_t *surf;
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int s, t, ds, dt;
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int i;
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mtexinfo_t *tex;
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byte *lightmap;
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unsigned int scale;
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int maps;
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if (node->contents < 0)
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return -1; // didn't hit anything
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// calculate mid point
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// FIXME: optimize for axial
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plane = node->plane;
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front = DotProduct (start, plane->normal) - plane->dist;
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back = DotProduct (end, plane->normal) - plane->dist;
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side = front < 0;
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if ((back < 0) == side)
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return RecursiveLightPoint (node->children[side], start, end);
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frac = front / (front - back);
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mid[0] = start[0] + (end[0] - start[0]) * frac;
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mid[1] = start[1] + (end[1] - start[1]) * frac;
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mid[2] = start[2] + (end[2] - start[2]) * frac;
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// go down front side
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r = RecursiveLightPoint (node->children[side], start, mid);
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if (r >= 0)
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return r; // hit something
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if ((back < 0) == side)
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return -1; // didn't hit anything
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// check for impact on this node
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VectorCopy (mid, lightspot);
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lightplane = plane;
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surf = cl.worldmodel->surfaces + node->firstsurface;
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for (i = 0; i < node->numsurfaces; i++, surf++) {
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if (surf->flags & SURF_DRAWTILED)
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continue; // no lightmaps
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tex = surf->texinfo;
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s = DotProduct (mid, tex->vecs[0]) + tex->vecs[0][3];
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t = DotProduct (mid, tex->vecs[1]) + tex->vecs[1][3];;
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if (s < surf->texturemins[0] || t < surf->texturemins[1])
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continue;
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ds = s - surf->texturemins[0];
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dt = t - surf->texturemins[1];
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if (ds > surf->extents[0] || dt > surf->extents[1])
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continue;
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if (!surf->samples)
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return 0;
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ds >>= 4;
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dt >>= 4;
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lightmap = surf->samples;
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r = 0;
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if (lightmap) {
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lightmap += dt * ((surf->extents[0] >> 4) + 1) + ds;
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for (maps = 0; maps < MAXLIGHTMAPS && surf->styles[maps] != 255;
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maps++) {
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scale = d_lightstylevalue[surf->styles[maps]];
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r += *lightmap * scale;
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lightmap += ((surf->extents[0] >> 4) + 1) *
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((surf->extents[1] >> 4) + 1);
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}
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r >>= 8;
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}
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return r;
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}
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// go down back side
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return RecursiveLightPoint (node->children[!side], mid, end);
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}
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int
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R_LightPoint (vec3_t p)
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{
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vec3_t end;
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int r;
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if (!cl.worldmodel->lightdata)
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return 255;
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end[0] = p[0];
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end[1] = p[1];
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end[2] = p[2] - 2048;
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r = RecursiveLightPoint (cl.worldmodel->nodes, p, end);
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if (r == -1)
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r = 0;
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return r;
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}
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