409 lines
11 KiB
C
409 lines
11 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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Copyright (C) 2010-2014 QuakeSpasm developers
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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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// r_light.c
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#include "q_defs.h"
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int32_t r_dlightframecount;
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extern cvar_t r_flatlightstyles; //johnfitz
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/*
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==================
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R_AnimateLight
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==================
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*/
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void R_AnimateLight(void)
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{
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int32_t 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 = (int32_t)(cl.time * 10);
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for(j = 0 ; j < MAX_LIGHTSTYLES ; j++)
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{
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if(!cl_lightstyle[j].length)
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{
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d_lightstylevalue[j] = 256;
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continue;
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}
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//johnfitz -- r_flatlightstyles
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if(r_flatlightstyles.value == 2)
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k = cl_lightstyle[j].peak - 'a';
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else if(r_flatlightstyles.value == 1)
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k = cl_lightstyle[j].average - 'a';
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else
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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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}
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d_lightstylevalue[j] = k * 22;
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//johnfitz
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}
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}
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/*
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=============================================================================
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DYNAMIC LIGHTS BLEND RENDERING (gl_flashblend 1)
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=============================================================================
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*/
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void 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[1] * (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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}
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void R_RenderDlight(dlight_t *light)
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{
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int32_t i, j;
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float a;
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vec3_t v;
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float rad;
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rad = light->radius * 0.35;
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VectorSubtract(light->origin, r_origin, v);
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if(VectorLength(v) < rad)
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{
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// view is inside the dlight
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AddLightBlend(1, 0.5, 0, light->radius * 0.0003);
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return;
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}
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glBegin(GL_TRIANGLE_FAN);
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glColor3f(0.2, 0.1, 0.0);
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for(i = 0 ; i < 3 ; i++)
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v[i] = light->origin[i] - vpn[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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{
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a = i / 16.0 * PI * 2;
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for(j = 0 ; j < 3 ; j++)
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v[j] = light->origin[j] + vright[j] * cos(a) * rad
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+ vup[j] * sin(a) * rad;
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glVertex3fv(v);
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}
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glEnd();
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}
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/*
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=============
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R_RenderDlights
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=============
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*/
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void R_RenderDlights(void)
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{
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int32_t i;
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dlight_t *l;
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if(!gl_flashblend.value)
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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(0);
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glDisable(GL_TEXTURE_2D);
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glShadeModel(GL_SMOOTH);
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glEnable(GL_BLEND);
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glBlendFunc(GL_ONE, GL_ONE);
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l = cl_dlights;
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for(i = 0 ; i < cl_max_dlights ; i++, l++)
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{
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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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glColor3f(1, 1, 1);
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glDisable(GL_BLEND);
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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(1);
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}
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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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/*
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=============
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R_MarkLights -- johnfitz -- rewritten to use LordHavoc's lighting speedup
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=============
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*/
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void R_MarkLights(dlight_t *light, int32_t num, mnode_t *node)
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{
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mplane_t *splitplane;
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msurface_t *surf;
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vec3_t impact;
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float dist, l, maxdist;
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int32_t i, j, s, t;
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start:
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if(node->contents < 0)
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return;
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splitplane = node->plane;
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if(splitplane->type < 3)
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dist = light->origin[splitplane->type] - splitplane->dist;
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else
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dist = DotProduct(light->origin, splitplane->normal) - splitplane->dist;
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if(dist > light->radius)
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{
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node = node->children[0];
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goto start;
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}
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if(dist < -light->radius)
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{
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node = node->children[1];
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goto start;
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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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{
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for(j = 0 ; j < 3 ; j++)
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impact[j] = light->origin[j] - surf->plane->normal[j] * dist;
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// clamp center of light to corner and check brightness
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l = DotProduct(impact, surf->texinfo->vecs[0]) + surf->texinfo->vecs[0][3] - surf->texturemins[0];
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s = l + 0.5;
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if(s < 0) s = 0;
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else if(s > surf->extents[0]) s = surf->extents[0];
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s = l - s;
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l = DotProduct(impact, surf->texinfo->vecs[1]) + surf->texinfo->vecs[1][3] - surf->texturemins[1];
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t = l + 0.5;
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if(t < 0) t = 0;
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else if(t > surf->extents[1]) 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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{
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if(surf->dlightframe != r_dlightframecount) // not dynamic until now
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{
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surf->dlightbits[num >> 5] = 1U << (num & 31);
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surf->dlightframe = r_dlightframecount;
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}
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else // already dynamic
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surf->dlightbits[num >> 5] |= 1U << (num & 31);
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}
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}
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if(node->children[0]->contents >= 0)
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R_MarkLights(light, num, node->children[0]);
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if(node->children[1]->contents >= 0)
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R_MarkLights(light, num, node->children[1]);
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}
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/*
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=============
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R_PushDlights
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=============
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*/
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void R_PushDlights(void)
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{
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int32_t i;
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dlight_t *l;
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if(gl_flashblend.value)
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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 < cl_max_dlights ; i++, l++)
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{
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if(l->die < cl.time || !l->radius)
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continue;
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R_MarkLights(l, i, cl.worldmodel->nodes);
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}
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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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*/
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mplane_t *lightplane;
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vec3_t lightspot;
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vec3_t lightcolor; //johnfitz -- lit support via lordhavoc
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/*
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=============
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RecursiveLightPoint -- johnfitz -- replaced entire function for lit support via lordhavoc
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=============
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*/
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int32_t RecursiveLightPoint(vec3_t color, mnode_t *node, vec3_t start, vec3_t end)
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{
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float front, back, frac;
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vec3_t mid;
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loc0:
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if(node->contents < 0)
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return false; // didn't hit anything
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// calculate mid point
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if(node->plane->type < 3)
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{
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front = start[node->plane->type] - node->plane->dist;
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back = end[node->plane->type] - node->plane->dist;
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}
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else
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{
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front = DotProduct(start, node->plane->normal) - node->plane->dist;
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back = DotProduct(end, node->plane->normal) - node->plane->dist;
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}
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// LordHavoc: optimized recursion
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if((back < 0) == (front < 0))
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// return RecursiveLightPoint (color, node->children[front < 0], start, end);
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{
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node = node->children[front < 0];
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goto loc0;
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}
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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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if(RecursiveLightPoint(color, node->children[front < 0], start, mid))
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return true; // hit something
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else
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{
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int32_t i, ds, dt;
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msurface_t *surf;
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// check for impact on this node
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VectorCopy(mid, lightspot);
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lightplane = node->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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{
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if(surf->flags & SURF_DRAWTILED)
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continue; // no lightmaps
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// ericw -- added double casts to force 64-bit precision.
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// Without them the zombie at the start of jam3_ericw.bsp was
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// incorrectly being lit up in SSE builds.
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ds = (int32_t)((double) DoublePrecisionDotProduct(mid, surf->texinfo->vecs[0]) + surf->texinfo->vecs[0][3]);
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dt = (int32_t)((double) DoublePrecisionDotProduct(mid, surf->texinfo->vecs[1]) + surf->texinfo->vecs[1][3]);
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if(ds < surf->texturemins[0] || dt < surf->texturemins[1])
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continue;
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ds -= surf->texturemins[0];
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dt -= 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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{
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// LordHavoc: enhanced to interpolate lighting
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byte *lightmap;
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int32_t maps, line3, dsfrac = ds & 15, dtfrac = dt & 15, r00 = 0, g00 = 0, b00 = 0, r01 = 0, g01 = 0, b01 = 0, r10 = 0, g10 = 0, b10 = 0, r11 = 0, g11 = 0, b11 = 0;
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float scale;
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line3 = ((surf->extents[0] >> 4) + 1) * 3;
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lightmap = surf->samples + ((dt >> 4) * ((surf->extents[0] >> 4) + 1) + (ds >> 4)) * 3; // LordHavoc: *3 for color
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for(maps = 0; maps < MAXLIGHTMAPS && surf->styles[maps] != 255; maps++)
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{
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scale = (float) d_lightstylevalue[surf->styles[maps]] * 1.0 / 256.0;
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r00 += (float) lightmap[ 0] * scale;
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g00 += (float) lightmap[ 1] * scale;
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b00 += (float) lightmap[2] * scale;
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r01 += (float) lightmap[ 3] * scale;
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g01 += (float) lightmap[ 4] * scale;
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b01 += (float) lightmap[5] * scale;
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r10 += (float) lightmap[line3 + 0] * scale;
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g10 += (float) lightmap[line3 + 1] * scale;
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b10 += (float) lightmap[line3 + 2] * scale;
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r11 += (float) lightmap[line3 + 3] * scale;
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g11 += (float) lightmap[line3 + 4] * scale;
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b11 += (float) lightmap[line3 + 5] * scale;
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lightmap += ((surf->extents[0] >> 4) + 1) * ((surf->extents[1] >> 4) + 1) * 3; // LordHavoc: *3 for colored lighting
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}
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color[0] += (float)((int32_t)((((((((r11 - r10) * dsfrac) >> 4) + r10) - ((((r01 - r00) * dsfrac) >> 4) + r00)) * dtfrac) >> 4) + ((((r01 - r00) * dsfrac) >> 4) + r00)));
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color[1] += (float)((int32_t)((((((((g11 - g10) * dsfrac) >> 4) + g10) - ((((g01 - g00) * dsfrac) >> 4) + g00)) * dtfrac) >> 4) + ((((g01 - g00) * dsfrac) >> 4) + g00)));
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color[2] += (float)((int32_t)((((((((b11 - b10) * dsfrac) >> 4) + b10) - ((((b01 - b00) * dsfrac) >> 4) + b00)) * dtfrac) >> 4) + ((((b01 - b00) * dsfrac) >> 4) + b00)));
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}
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return true; // success
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}
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// go down back side
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return RecursiveLightPoint(color, node->children[front >= 0], mid, end);
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}
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}
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/*
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=============
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R_LightPoint -- johnfitz -- replaced entire function for lit support via lordhavoc
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=============
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*/
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int32_t R_LightPoint(vec3_t p)
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{
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vec3_t end;
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if(!cl.worldmodel->lightdata)
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{
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lightcolor[0] = lightcolor[1] = lightcolor[2] = 255;
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return 255;
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}
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end[0] = p[0];
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end[1] = p[1];
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end[2] = p[2] - 8192; //johnfitz -- was 2048
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lightcolor[0] = lightcolor[1] = lightcolor[2] = 0;
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RecursiveLightPoint(lightcolor, cl.worldmodel->nodes, p, end);
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return ((lightcolor[0] + lightcolor[1] + lightcolor[2]) * (1.0f / 3.0f));
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}
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