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newtree/source/gl_rsurf.c
Bill Currie ccba39666b #include audit
2000-12-30 02:16:36 +00:00

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/*
gl_rsurf.c
surface-related refresh code
Copyright (C) 1996-1997 Id Software, Inc.
Copyright (C) 2000 Joseph Carter <knghtbrd@debian.org>
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to:
Free Software Foundation, Inc.
59 Temple Place - Suite 330
Boston, MA 02111-1307, USA
$Id$
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <stdio.h>
#ifdef HAVE_STRING_H
#include <string.h>
#endif
#ifdef HAVE_STRINGS_H
#include <strings.h>
#endif
#include <math.h>
#include "glquake.h"
#include "sys.h"
qboolean r_cache_thrash;
extern double realtime;
int skytexturenum;
extern vec3_t shadecolor; // Ender (Extend) Colormod
int lightmap_bytes; // 1 or 3
int lightmap_textures;
unsigned int blocklights[18 * 18 * 3];
cvar_t *gl_colorlights;
#define BLOCK_WIDTH 128
#define BLOCK_HEIGHT 128
// LordHavoc: since lightmaps are now allocated only as needed, allow a ridiculous number :)
#define MAX_LIGHTMAPS 1024
int active_lightmaps;
typedef struct glRect_s {
unsigned char l, t, w, h;
} glRect_t;
glpoly_t *lightmap_polys[MAX_LIGHTMAPS];
glpoly_t *fullbright_polys[MAX_GLTEXTURES];
qboolean lightmap_modified[MAX_LIGHTMAPS];
glRect_t lightmap_rectchange[MAX_LIGHTMAPS];
int allocated[MAX_LIGHTMAPS][BLOCK_WIDTH];
// the lightmap texture data needs to be kept in
// main memory so texsubimage can update properly
// LordHavoc: changed to be allocated at runtime (typically lower memory usage)
byte *lightmaps[MAX_LIGHTMAPS];
msurface_t *waterchain = NULL;
msurface_t *sky_chain;
extern qboolean lighthalf;
// LordHavoc: place for gl_rsurf setup code
void
glrsurf_init (void)
{
memset (&lightmaps, 0, sizeof (lightmaps));
}
void
R_RecursiveLightUpdate (mnode_t *node)
{
int c;
msurface_t *surf;
if (node->children[0]->contents >= 0)
R_RecursiveLightUpdate (node->children[0]);
if (node->children[1]->contents >= 0)
R_RecursiveLightUpdate (node->children[1]);
if ((c = node->numsurfaces))
for (surf = cl.worldmodel->surfaces + node->firstsurface; c;
c--, surf++) surf->cached_dlight = true;
}
// LordHavoc: function to force all lightmaps to be updated
void
R_ForceLightUpdate (void)
{
if (cl.worldmodel && cl.worldmodel->nodes
&& cl.worldmodel->nodes->contents >= 0)
R_RecursiveLightUpdate (cl.worldmodel->nodes);
}
/*
R_AddDynamicLights
LordHavoc: completely rewrote this, relies on 64bit integer math...
*/
int dlightdivtable[8192];
int dlightdivtableinitialized = 0;
/*
===============
R_AddDynamicLights
NOTE! LordHavoc was here, and it shows... (Mercury)
===============
*/
void
R_AddDynamicLights (msurface_t *surf)
{
int sdtable[18], lnum, td, maxdist, maxdist2, maxdist3, i, s, t,
smax, tmax, red, green, blue, j;
unsigned int *bl;
float dist, f;
vec3_t impact, local;
// use 64bit integer... shame it's not very standardized...
#if _MSC_VER || __BORLANDC__
__int64 k;
#else
long long k;
#endif
if (!dlightdivtableinitialized) {
dlightdivtable[0] = 1048576 >> 7;
for (s = 1; s < 8192; s++)
dlightdivtable[s] = 1048576 / (s << 7);
dlightdivtableinitialized = 1;
}
smax = (surf->extents[0] >> 4) + 1;
tmax = (surf->extents[1] >> 4) + 1;
for (lnum = 0; lnum < MAX_DLIGHTS; lnum++) {
if (!(surf->dlightbits & (1 << lnum)))
continue; // not lit by this light
VectorSubtract (cl_dlights[lnum].origin, currententity->origin, local);
dist = DotProduct (local, surf->plane->normal) - surf->plane->dist;
for (i = 0; i < 3; i++)
impact[i] =
cl_dlights[lnum].origin[i] - surf->plane->normal[i] * dist;
i = f = DotProduct (impact, surf->texinfo->vecs[0]) + surf->texinfo->vecs[0][3] - surf->texturemins[0];
// reduce calculations
t = dist * dist;
for (s = 0; s < smax; s++, i -= 16)
sdtable[s] = i * i + t;
i = f = DotProduct (impact, surf->texinfo->vecs[1]) + surf->texinfo->vecs[1][3] - surf->texturemins[1];
// for comparisons to minimum acceptable light
maxdist = (int) ((cl_dlights[lnum].radius * cl_dlights[lnum].radius) * 0.75);
// clamp radius to avoid exceeding 8192 entry division table
if (maxdist > 1048576)
maxdist = 1048576;
maxdist3 = maxdist - (int) (dist * dist);
// convert to 8.8 blocklights format
red = f = cl_dlights[lnum].color[0] * maxdist;
green = f = cl_dlights[lnum].color[1] * maxdist;
blue = f = cl_dlights[lnum].color[2] * maxdist;
bl = blocklights;
for (t = 0; t < tmax; t++, i -= 16) {
td = i * i;
if (td < maxdist3) { // make sure some part of it is visible on this line
maxdist2 = maxdist - td;
for (s = 0; s < smax; s++) {
if (sdtable[s] < maxdist2) {
j = dlightdivtable[(sdtable[s] + td) >> 7];
bl[0] += (k = (red * j) >> 7);
bl[1] += (k = (green * j) >> 7);
bl[2] += (k = (blue * j) >> 7);
}
bl += 3;
}
} else
bl += smax * 3; // skip line
}
}
}
/*
R_BuildLightMap
Combine and scale multiple lightmaps
After talking it over with LordHavoc, I've decided to switch to using
GL_RGB for colored lights and averaging them out for plain white
lighting if needed. Much cleaner that way. --KB
*/
void
R_BuildLightMap (msurface_t *surf, byte * dest, int stride)
{
int smax, tmax;
int t;
int i, j, size;
byte *lightmap;
unsigned int scale;
int maps;
float t2;
unsigned int *bl;
surf->cached_dlight = (surf->dlightframe == r_framecount);
smax = (surf->extents[0] >> 4) + 1;
tmax = (surf->extents[1] >> 4) + 1;
size = smax * tmax;
lightmap = surf->samples;
// set to full bright if no light data
if (!cl.worldmodel->lightdata) {
bl = blocklights;
for (i = 0; i < size; i++) {
*bl++ = 255 << 8;
*bl++ = 255 << 8;
*bl++ = 255 << 8;
}
goto store;
}
// clear to no light
bl = blocklights;
for (i = 0; i < size; i++) {
*bl++ = 0;
*bl++ = 0;
*bl++ = 0;
}
bl = blocklights;
// add all the lightmaps
if (lightmap) {
for (maps = 0; maps < MAXLIGHTMAPS && surf->styles[maps] != 255; maps++) {
scale = d_lightstylevalue[surf->styles[maps]];
surf->cached_light[maps] = scale; // 8.8 fraction
bl = blocklights;
for (i = 0; i < size; i++) {
*bl++ += *lightmap++ * scale;
*bl++ += *lightmap++ * scale;
*bl++ += *lightmap++ * scale;
}
}
}
// add all the dynamic lights
if (surf->dlightframe == r_framecount)
R_AddDynamicLights (surf);
store:
// bound and shift
if (gl_colorlights->int_val) {
stride -= smax * 3;
bl = blocklights;
if (lighthalf) {
for (i = 0; i < tmax; i++, dest += stride) {
for (j = 0; j < smax; j++) {
t = (int) *bl++ >> 8;
*dest++ = bound (0, t, 255);
t = (int) *bl++ >> 8;
*dest++ = bound (0, t, 255);
t = (int) *bl++ >> 8;
*dest++ = bound (0, t, 255);
}
}
} else {
for (i = 0; i < tmax; i++, dest += stride) {
for (j = 0; j < smax; j++) {
t = (int) *bl++ >> 7;
*dest++ = bound (0, t, 255);
t = (int) *bl++ >> 7;
*dest++ = bound (0, t, 255);
t = (int) *bl++ >> 7;
*dest++ = bound (0, t, 255);
}
}
}
} else {
stride -= smax;
bl = blocklights;
if (lighthalf) {
for (i = 0; i < tmax; i++, dest += stride) {
for (j = 0; j < smax; j++) {
t = (int) *bl++ >> 8;
t2 = bound (0, t, 255);
t = (int) *bl++ >> 8;
t2 += bound (0, t, 255);
t = (int) *bl++ >> 8;
t2 += bound (0, t, 255);
t2 *= (1.0 / 3.0);
*dest++ = t2;
}
}
} else {
for (i = 0; i < tmax; i++, dest += stride) {
for (j = 0; j < smax; j++) {
t = (int) *bl++ >> 7;
t2 = bound (0, t, 255);
t = (int) *bl++ >> 7;
t2 += bound (0, t, 255);
t = (int) *bl++ >> 7;
t2 += bound (0, t, 255);
t2 *= (1.0 / 3.0);
*dest++ = t2;
}
}
}
}
}
/*
===============
R_TextureAnimation
Returns the proper texture for a given time and base texture
===============
*/
texture_t *
R_TextureAnimation (texture_t *base)
{
int relative;
int count;
if (currententity->frame) {
if (base->alternate_anims)
base = base->alternate_anims;
}
if (!base->anim_total)
return base;
relative = (int) (cl.time * 10) % base->anim_total;
count = 0;
while (base->anim_min > relative || base->anim_max <= relative) {
base = base->anim_next;
if (!base)
Sys_Error ("R_TextureAnimation: broken cycle");
if (++count > 100)
Sys_Error ("R_TextureAnimation: infinite cycle");
}
return base;
}
/*
=============================================================
BRUSH MODELS
=============================================================
*/
extern int solidskytexture;
extern int alphaskytexture;
extern float speedscale; // for top sky and bottom sky
lpMTexFUNC qglMTexCoord2f = NULL;
lpSelTexFUNC qglSelectTexture = NULL;
void
GL_UploadLightmap (int i, int x, int y, int w, int h)
{
glTexSubImage2D (GL_TEXTURE_2D, 0, 0, y, BLOCK_WIDTH, h, gl_lightmap_format,
GL_UNSIGNED_BYTE,
lightmaps[i] + (y * BLOCK_WIDTH) * lightmap_bytes);
}
/*
================
R_DrawSequentialPoly
Systems that have fast state and texture changes can
just do everything as it passes with no need to sort
================
*/
void
R_DrawMultitexturePoly (msurface_t *s)
{
int maps;
float *v;
int i;
texture_t *texture = R_TextureAnimation (s->texinfo->texture);
c_brush_polys++;
i = s->lightmaptexturenum;
glColor3f (1, 1, 1);
// Binds world to texture env 0
qglSelectTexture (gl_mtex_enum + 0);
glBindTexture (GL_TEXTURE_2D, texture->gl_texturenum);
glTexEnvf (GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
glEnable (GL_TEXTURE_2D);
// Binds lightmap to texenv 1
qglSelectTexture (gl_mtex_enum + 1);
glBindTexture (GL_TEXTURE_2D, lightmap_textures + i);
glTexEnvf (GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
glEnable (GL_TEXTURE_2D);
// check for lightmap modification
if (r_dynamic->int_val) {
for (maps = 0; maps < MAXLIGHTMAPS && s->styles[maps] != 255; maps++)
if (d_lightstylevalue[s->styles[maps]] != s->cached_light[maps])
goto dynamic;
if (s->dlightframe == r_framecount // dynamic this frame
|| s->cached_dlight) // dynamic previously
{
dynamic:
R_BuildLightMap (s,
lightmaps[s->lightmaptexturenum] +
(s->light_t * BLOCK_WIDTH +
s->light_s) * lightmap_bytes,
BLOCK_WIDTH * lightmap_bytes);
GL_UploadLightmap (i, s->light_s, s->light_t,
(s->extents[0] >> 4) + 1,
(s->extents[1] >> 4) + 1);
}
}
glBegin (GL_POLYGON);
v = s->polys->verts[0];
for (i = 0; i < s->polys->numverts; i++, v += VERTEXSIZE) {
qglMTexCoord2f (gl_mtex_enum + 0, v[3], v[4]);
qglMTexCoord2f (gl_mtex_enum + 1, v[5], v[6]);
glVertex3fv (v);
}
glEnd ();
glDisable (GL_TEXTURE_2D);
qglSelectTexture (gl_mtex_enum + 0);
glEnable (GL_TEXTURE_2D);
if (texture->gl_fb_texturenum > 0) {
s->polys->fb_chain = fullbright_polys[texture->gl_fb_texturenum];
fullbright_polys[texture->gl_fb_texturenum] = s->polys;
}
glColor3ubv (lighthalf_v);
glTexEnvf (GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
}
/*
================
R_BlendLightmaps
================
*/
void
R_BlendLightmaps (void)
{
int i, j;
glpoly_t *p;
float *v;
glDepthMask (GL_FALSE); // don't bother writing Z
glBlendFunc (GL_ZERO, GL_SRC_COLOR);
glColor3f (1, 1, 1);
for (i = 0; i < MAX_LIGHTMAPS; i++) {
p = lightmap_polys[i];
if (!p)
continue;
glBindTexture (GL_TEXTURE_2D, lightmap_textures + i);
if (lightmap_modified[i]) {
GL_UploadLightmap (i, lightmap_rectchange[i].l,
lightmap_rectchange[i].t,
lightmap_rectchange[i].w,
lightmap_rectchange[i].h);
lightmap_modified[i] = false;
}
for (; p; p = p->chain) {
glBegin (GL_POLYGON);
v = p->verts[0];
for (j = 0; j < p->numverts; j++, v += VERTEXSIZE) {
glTexCoord2fv (&v[5]);
glVertex3fv (v);
}
glEnd ();
}
}
// Return to normal blending --KB
glColor3ubv (lighthalf_v);
glBlendFunc (GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
glDepthMask (GL_TRUE); // back to normal Z buffering
}
/*
R_RenderFullbrights
*/
void
R_RenderFullbrights (void)
{
int i, j;
glpoly_t *p;
float *v;
glBlendFunc (GL_ONE, GL_ONE);
for (i = 1; i < MAX_GLTEXTURES; i++) {
if (!fullbright_polys[i])
continue;
glBindTexture (GL_TEXTURE_2D, i);
for (p = fullbright_polys[i]; p; p = p->fb_chain) {
glBegin (GL_POLYGON);
for (j = 0, v = p->verts[0]; j < p->numverts; j++, v += VERTEXSIZE) {
glTexCoord2fv (&v[3]);
glVertex3fv (v);
}
glEnd ();
}
}
glBlendFunc (GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
}
/*
================
R_RenderBrushPoly
================
*/
void
R_RenderBrushPoly (msurface_t *fa)
{
byte *base;
int maps;
glRect_t *theRect;
int i;
float *v;
int smax, tmax;
texture_t *texture = R_TextureAnimation (fa->texinfo->texture);
c_brush_polys++;
glColor3f (1, 1, 1);
glBindTexture (GL_TEXTURE_2D, texture->gl_texturenum);
glBegin (GL_POLYGON);
v = fa->polys->verts[0];
for (i = 0; i < fa->polys->numverts; i++, v += VERTEXSIZE) {
glTexCoord2fv (&v[3]);
glVertex3fv (v);
}
glEnd ();
// add the poly to the proper lightmap chain
fa->polys->chain = lightmap_polys[fa->lightmaptexturenum];
lightmap_polys[fa->lightmaptexturenum] = fa->polys;
if (texture->gl_fb_texturenum > 0) {
fa->polys->fb_chain = fullbright_polys[texture->gl_fb_texturenum];
fullbright_polys[texture->gl_fb_texturenum] = fa->polys;
}
// check for lightmap modification
for (maps = 0; maps < MAXLIGHTMAPS && fa->styles[maps] != 255; maps++)
if (d_lightstylevalue[fa->styles[maps]] != fa->cached_light[maps])
goto dynamic;
if (fa->dlightframe == r_framecount // dynamic this frame
|| fa->cached_dlight) // dynamic previously
{
dynamic:
if (r_dynamic->int_val) {
lightmap_modified[fa->lightmaptexturenum] = true;
theRect = &lightmap_rectchange[fa->lightmaptexturenum];
if (fa->light_t < theRect->t) {
if (theRect->h)
theRect->h += theRect->t - fa->light_t;
theRect->t = fa->light_t;
}
if (fa->light_s < theRect->l) {
if (theRect->w)
theRect->w += theRect->l - fa->light_s;
theRect->l = fa->light_s;
}
smax = (fa->extents[0] >> 4) + 1;
tmax = (fa->extents[1] >> 4) + 1;
if ((theRect->w + theRect->l) < (fa->light_s + smax))
theRect->w = (fa->light_s - theRect->l) + smax;
if ((theRect->h + theRect->t) < (fa->light_t + tmax))
theRect->h = (fa->light_t - theRect->t) + tmax;
base =
lightmaps[fa->lightmaptexturenum] + (fa->light_t * BLOCK_WIDTH +
fa->light_s) *
lightmap_bytes;
R_BuildLightMap (fa, base, BLOCK_WIDTH * lightmap_bytes);
}
}
glColor3ubv (lighthalf_v);
}
void
GL_WaterSurface (msurface_t *s)
{
int i;
i = s->texinfo->texture->gl_texturenum;
glBindTexture (GL_TEXTURE_2D, i);
if (r_wateralpha->value < 1.0) {
glDepthMask (GL_FALSE);
if (lighthalf) {
glColor4f (0.5, 0.5, 0.5, r_wateralpha->value);
} else {
glColor4f (1, 1, 1, r_wateralpha->value);
}
EmitWaterPolys (s);
glColor3ubv (lighthalf_v);
glDepthMask (GL_TRUE);
} else
EmitWaterPolys (s);
}
/*
================
R_DrawWaterSurfaces
================
*/
void
R_DrawWaterSurfaces (void)
{
int i;
msurface_t *s;
if (!waterchain)
return;
// go back to the world matrix
glLoadMatrixf (r_world_matrix);
if (r_wateralpha->value < 1.0) {
glDepthMask (GL_FALSE);
if (lighthalf) {
glColor4f (0.5, 0.5, 0.5, r_wateralpha->value);
} else {
glColor4f (1, 1, 1, r_wateralpha->value);
}
}
i = -1;
for (s = waterchain; s; s = s->texturechain) {
if (i != s->texinfo->texture->gl_texturenum) {
i = s->texinfo->texture->gl_texturenum;
glBindTexture (GL_TEXTURE_2D, i);
}
EmitWaterPolys (s);
}
waterchain = NULL;
if (r_wateralpha->value < 1.0) {
glDepthMask (GL_TRUE);
glColor3ubv (lighthalf_v);
}
}
/*
================
DrawTextureChains
================
*/
void
DrawTextureChains (void)
{
int i;
msurface_t *s;
glDisable (GL_BLEND);
for (i = 0; i < cl.worldmodel->numtextures; i++) {
if (!cl.worldmodel->textures[i])
continue;
for (s = cl.worldmodel->textures[i]->texturechain; s;
s = s->texturechain) R_RenderBrushPoly (s);
cl.worldmodel->textures[i]->texturechain = NULL;
}
glEnable (GL_BLEND);
}
/*
=================
R_DrawBrushModel
=================
*/
void
R_DrawBrushModel (entity_t *e)
{
int i;
int k;
vec3_t mins, maxs;
msurface_t *psurf;
float dot;
mplane_t *pplane;
model_t *clmodel;
qboolean rotated;
currententity = e;
clmodel = e->model;
if (e->angles[0] || e->angles[1] || e->angles[2]) {
rotated = true;
for (i = 0; i < 3; i++) {
mins[i] = e->origin[i] - clmodel->radius;
maxs[i] = e->origin[i] + clmodel->radius;
}
} else {
rotated = false;
VectorAdd (e->origin, clmodel->mins, mins);
VectorAdd (e->origin, clmodel->maxs, maxs);
}
if (R_CullBox (mins, maxs))
return;
memset (lightmap_polys, 0, sizeof (lightmap_polys));
memset (fullbright_polys, 0, sizeof (fullbright_polys));
if (gl_sky_clip->int_val) {
sky_chain = 0;
}
VectorSubtract (r_refdef.vieworg, e->origin, modelorg);
if (rotated) {
vec3_t temp;
vec3_t forward, right, up;
VectorCopy (modelorg, temp);
AngleVectors (e->angles, forward, right, up);
modelorg[0] = DotProduct (temp, forward);
modelorg[1] = -DotProduct (temp, right);
modelorg[2] = DotProduct (temp, up);
}
psurf = &clmodel->surfaces[clmodel->firstmodelsurface];
// calculate dynamic lighting for bmodel if it's not an
// instanced model
if (clmodel->firstmodelsurface != 0 && !gl_flashblend->int_val) {
vec3_t lightorigin;
for (k = 0; k < MAX_DLIGHTS; k++) {
if ((cl_dlights[k].die < cl.time) || (!cl_dlights[k].radius))
continue;
VectorSubtract (cl_dlights[k].origin, e->origin, lightorigin);
R_MarkLights (lightorigin, &cl_dlights[k], 1 << k,
clmodel->nodes + clmodel->hulls[0].firstclipnode);
}
}
glPushMatrix ();
e->angles[0] = -e->angles[0]; // stupid quake bug
R_RotateForEntity (e);
e->angles[0] = -e->angles[0]; // stupid quake bug
// LordHavoc: anyone without multitexture won't want texsort 0 anyway...
if (!gl_mtexable)
Cvar_SetValue (gl_texsort, 1);
//
// draw texture
//
for (i = 0; i < clmodel->nummodelsurfaces; i++, psurf++) {
// find which side of the node we are on
pplane = psurf->plane;
dot = DotProduct (modelorg, pplane->normal) - pplane->dist;
// draw the polygon
if (((psurf->flags & SURF_PLANEBACK) && (dot < -BACKFACE_EPSILON)) ||
(!(psurf->flags & SURF_PLANEBACK) && (dot > BACKFACE_EPSILON))) {
if (psurf->flags & SURF_DRAWTURB) {
GL_WaterSurface (psurf);
} else if (psurf->flags & SURF_DRAWSKY) {
psurf->texturechain = sky_chain;
sky_chain = psurf;
return;
} else if (gl_texsort->int_val) {
R_RenderBrushPoly (psurf);
} else {
R_DrawMultitexturePoly (psurf);
}
}
}
if (gl_texsort->int_val)
R_BlendLightmaps ();
if (gl_fb_bmodels->int_val)
R_RenderFullbrights ();
if (gl_sky_clip->int_val)
R_DrawSkyChain (sky_chain);
glPopMatrix ();
}
/*
=============================================================
WORLD MODEL
=============================================================
*/
/*
================
R_RecursiveWorldNode
================
*/
void
R_RecursiveWorldNode (mnode_t *node)
{
int c, side;
mplane_t *plane;
msurface_t *surf, **mark;
mleaf_t *pleaf;
double dot;
if (node->contents == CONTENTS_SOLID) // solid
return;
if (node->visframe != r_visframecount)
return;
if (R_CullBox (node->minmaxs, node->minmaxs + 3))
return;
// if a leaf node, draw stuff
if (node->contents < 0) {
pleaf = (mleaf_t *) node;
if ((c = pleaf->nummarksurfaces)) {
mark = pleaf->firstmarksurface;
do {
(*mark)->visframe = r_framecount;
mark++;
} while (--c);
}
// deal with model fragments in this leaf
if (pleaf->efrags)
R_StoreEfrags (&pleaf->efrags);
return;
}
// node is just a decision point, so go down the apropriate sides
// find which side of the node we are on
plane = node->plane;
switch (plane->type) {
case PLANE_X:
dot = modelorg[0] - plane->dist;
break;
case PLANE_Y:
dot = modelorg[1] - plane->dist;
break;
case PLANE_Z:
dot = modelorg[2] - plane->dist;
break;
default:
dot = DotProduct (modelorg, plane->normal) - plane->dist;
break;
}
side = dot < 0;
// recurse down the children, front side first
// LordHavoc: save a stack frame by avoiding a call
if (node->children[side]->contents != CONTENTS_SOLID
&& node->children[side]->visframe == r_visframecount
&& !R_CullBox (node->children[side]->minmaxs,
node->children[side]->minmaxs + 3))
R_RecursiveWorldNode (node->children[side]);
// draw stuff
if ((c = node->numsurfaces)) {
surf = cl.worldmodel->surfaces + node->firstsurface;
if (dot < -BACKFACE_EPSILON)
side = SURF_PLANEBACK;
else if (dot > BACKFACE_EPSILON)
side = 0;
for (; c; c--, surf++) {
if (surf->visframe != r_framecount)
continue;
if ((dot < 0) ^ !!(surf->flags & SURF_PLANEBACK))
continue; // wrong side
if (surf->flags & SURF_DRAWTURB) {
surf->texturechain = waterchain;
waterchain = surf;
} else if (surf->flags & SURF_DRAWSKY) {
surf->texturechain = sky_chain;
sky_chain = surf;
continue;
} else if (gl_texsort->int_val) {
surf->texturechain = surf->texinfo->texture->texturechain;
surf->texinfo->texture->texturechain = surf;
} else {
R_DrawMultitexturePoly (surf);
}
}
}
// recurse down the back side
// LordHavoc: save a stack frame by avoiding a call
side = !side;
if (node->children[side]->contents != CONTENTS_SOLID
&& node->children[side]->visframe == r_visframecount
&& !R_CullBox (node->children[side]->minmaxs,
node->children[side]->minmaxs + 3))
R_RecursiveWorldNode (node->children[side]);
}
/*
=============
R_DrawWorld
=============
*/
void
R_DrawWorld (void)
{
entity_t ent;
memset (&ent, 0, sizeof (ent));
ent.model = cl.worldmodel;
VectorCopy (r_refdef.vieworg, modelorg);
currententity = &ent;
// LordHavoc: anyone without multitexture won't want texsort 0 anyway...
if (!gl_mtexable)
Cvar_SetValue (gl_texsort, 1);
memset (lightmap_polys, 0, sizeof (lightmap_polys));
memset (fullbright_polys, 0, sizeof (fullbright_polys));
if (gl_sky_clip->int_val) {
sky_chain = 0;
} else {
// Be sure to clear the skybox --KB
R_DrawSky ();
}
R_RecursiveWorldNode (cl.worldmodel->nodes);
DrawTextureChains ();
if (gl_texsort->int_val)
R_BlendLightmaps ();
if (gl_fb_bmodels->int_val)
R_RenderFullbrights ();
if (gl_sky_clip->int_val)
R_DrawSkyChain (sky_chain);
}
/*
===============
R_MarkLeaves
===============
*/
void
R_MarkLeaves (void)
{
byte *vis;
mnode_t *node;
int i;
byte solid[4096];
if (r_oldviewleaf == r_viewleaf && !r_novis->int_val)
return;
r_visframecount++;
r_oldviewleaf = r_viewleaf;
if (r_novis->int_val) {
vis = solid;
memset (solid, 0xff, (cl.worldmodel->numleafs + 7) >> 3);
} else
vis = Mod_LeafPVS (r_viewleaf, cl.worldmodel);
for (i = 0; i < cl.worldmodel->numleafs; i++) {
if (vis[i >> 3] & (1 << (i & 7))) {
node = (mnode_t *) &cl.worldmodel->leafs[i + 1];
do {
if (node->visframe == r_visframecount)
break;
node->visframe = r_visframecount;
node = node->parent;
} while (node);
}
}
}
/*
=============================================================================
LIGHTMAP ALLOCATION
=============================================================================
*/
// returns a texture number and the position inside it
int
AllocBlock (int w, int h, int *x, int *y)
{
int i, j;
int best, best2;
int texnum;
for (texnum = 0; texnum < MAX_LIGHTMAPS; texnum++) {
best = BLOCK_HEIGHT;
for (i = 0; i < BLOCK_WIDTH - w; i++) {
best2 = 0;
for (j = 0; j < w; j++) {
if (allocated[texnum][i + j] >= best)
break;
if (allocated[texnum][i + j] > best2)
best2 = allocated[texnum][i + j];
}
if (j == w) {
// this is a valid spot
*x = i;
*y = best = best2;
}
}
if (best + h > BLOCK_HEIGHT)
continue;
// LordHavoc: allocate lightmaps only as needed
if (!lightmaps[texnum])
lightmaps[texnum] = calloc (BLOCK_WIDTH * BLOCK_HEIGHT, 3);
for (i = 0; i < w; i++)
allocated[texnum][*x + i] = best + h;
return texnum;
}
Sys_Error ("AllocBlock: full");
return 0;
}
mvertex_t *r_pcurrentvertbase;
model_t *currentmodel;
int nColinElim;
/*
================
BuildSurfaceDisplayList
================
*/
void
BuildSurfaceDisplayList (msurface_t *fa)
{
int i, lindex, lnumverts;
medge_t *pedges, *r_pedge;
int vertpage;
float *vec;
float s, t;
glpoly_t *poly;
// reconstruct the polygon
pedges = currentmodel->edges;
lnumverts = fa->numedges;
vertpage = 0;
// draw texture
poly = Hunk_Alloc (sizeof (glpoly_t) + (lnumverts - 4) * VERTEXSIZE * sizeof (float));
poly->next = fa->polys;
poly->flags = fa->flags;
fa->polys = poly;
poly->numverts = lnumverts;
for (i = 0; i < lnumverts; i++) {
lindex = currentmodel->surfedges[fa->firstedge + i];
if (lindex > 0) {
r_pedge = &pedges[lindex];
vec = r_pcurrentvertbase[r_pedge->v[0]].position;
} else {
r_pedge = &pedges[-lindex];
vec = r_pcurrentvertbase[r_pedge->v[1]].position;
}
s = DotProduct (vec, fa->texinfo->vecs[0]) + fa->texinfo->vecs[0][3];
s /= fa->texinfo->texture->width;
t = DotProduct (vec, fa->texinfo->vecs[1]) + fa->texinfo->vecs[1][3];
t /= fa->texinfo->texture->height;
VectorCopy (vec, poly->verts[i]);
poly->verts[i][3] = s;
poly->verts[i][4] = t;
// lightmap texture coordinates
s = DotProduct (vec, fa->texinfo->vecs[0]) + fa->texinfo->vecs[0][3];
s -= fa->texturemins[0];
s += fa->light_s * 16;
s += 8;
s /= BLOCK_WIDTH * 16; // fa->texinfo->texture->width;
t = DotProduct (vec, fa->texinfo->vecs[1]) + fa->texinfo->vecs[1][3];
t -= fa->texturemins[1];
t += fa->light_t * 16;
t += 8;
t /= BLOCK_HEIGHT * 16; // fa->texinfo->texture->height;
poly->verts[i][5] = s;
poly->verts[i][6] = t;
}
// remove co-linear points - Ed
if (!gl_keeptjunctions->int_val && !(fa->flags & SURF_UNDERWATER)) {
for (i = 0; i < lnumverts; ++i) {
vec3_t v1, v2;
float *prev, *this, *next;
prev = poly->verts[(i + lnumverts - 1) % lnumverts];
this = poly->verts[i];
next = poly->verts[(i + 1) % lnumverts];
VectorSubtract (this, prev, v1);
VectorNormalize (v1);
VectorSubtract (next, prev, v2);
VectorNormalize (v2);
// skip co-linear points
# define COLINEAR_EPSILON 0.001
if ((fabs (v1[0] - v2[0]) <= COLINEAR_EPSILON) &&
(fabs (v1[1] - v2[1]) <= COLINEAR_EPSILON) &&
(fabs (v1[2] - v2[2]) <= COLINEAR_EPSILON)) {
int j;
for (j = i + 1; j < lnumverts; ++j) {
int k;
for (k = 0; k < VERTEXSIZE; ++k)
poly->verts[j - 1][k] = poly->verts[j][k];
}
--lnumverts;
++nColinElim;
// retry next vertex next time, which is now current vertex
--i;
}
}
}
poly->numverts = lnumverts;
}
/*
========================
GL_CreateSurfaceLightmap
========================
*/
void
GL_CreateSurfaceLightmap (msurface_t *surf)
{
int smax, tmax;
byte *base;
if (surf->flags & (SURF_DRAWSKY | SURF_DRAWTURB))
return;
smax = (surf->extents[0] >> 4) + 1;
tmax = (surf->extents[1] >> 4) + 1;
surf->lightmaptexturenum = AllocBlock (smax, tmax, &surf->light_s, &surf->light_t);
base = lightmaps[surf->lightmaptexturenum] + (surf->light_t * BLOCK_WIDTH + surf->light_s) * lightmap_bytes;
R_BuildLightMap (surf, base, BLOCK_WIDTH * lightmap_bytes);
}
/*
==================
GL_BuildLightmaps
Builds the lightmap texture
with all the surfaces from all brush models
==================
*/
void
GL_BuildLightmaps (void)
{
int i, j;
model_t *m;
memset (allocated, 0, sizeof (allocated));
r_framecount = 1; // no dlightcache
if (!lightmap_textures) {
lightmap_textures = texture_extension_number;
texture_extension_number += MAX_LIGHTMAPS;
}
if (gl_colorlights->int_val) {
gl_lightmap_format = GL_RGB;
lightmap_bytes = 3;
} else {
gl_lightmap_format = GL_LUMINANCE;
lightmap_bytes = 1;
}
for (j = 1; j < MAX_MODELS; j++) {
m = cl.model_precache[j];
if (!m)
break;
if (m->name[0] == '*')
continue;
r_pcurrentvertbase = m->vertexes;
currentmodel = m;
for (i = 0; i < m->numsurfaces; i++) {
if (m->surfaces[i].flags & SURF_DRAWTURB)
continue;
if (gl_sky_divide->int_val && (m->surfaces[i].flags & SURF_DRAWSKY))
continue;
GL_CreateSurfaceLightmap (m->surfaces + i);
BuildSurfaceDisplayList (m->surfaces + i);
}
}
if (gl_mtexable && !gl_texsort->int_val)
qglSelectTexture (gl_mtex_enum + 1);
//
// upload all lightmaps that were filled
//
for (i = 0; i < MAX_LIGHTMAPS; i++) {
if (!allocated[i][0])
break; // no more used
lightmap_modified[i] = false;
lightmap_rectchange[i].l = BLOCK_WIDTH;
lightmap_rectchange[i].t = BLOCK_HEIGHT;
lightmap_rectchange[i].w = 0;
lightmap_rectchange[i].h = 0;
glBindTexture (GL_TEXTURE_2D, lightmap_textures + i);
glTexParameterf (GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameterf (GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexImage2D (GL_TEXTURE_2D, 0, lightmap_bytes, BLOCK_WIDTH,
BLOCK_HEIGHT, 0, gl_lightmap_format,
GL_UNSIGNED_BYTE, lightmaps[i]);
}
if (gl_mtexable && !gl_texsort->int_val)
qglSelectTexture (gl_mtex_enum + 0);
}
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