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quakeforge/libs/models/brush/gl_model_brush.c
Bill Currie 34dc7cf2df [models] Move brush data into its own struct 
This is a big step towards a cleaner api. The struct reference in
model_t really should be a pointer, but bsp submodel(?) loading messed
that up, though that's just a matter of taking more care in the loading
code. It seems sensible to make that a separate step.
2021-02-01 19:31:11 +09:00

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/*
gl_model_brush.c
gl support routines for model loading and caching
Copyright (C) 1996-1997 Id Software, Inc.
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
*/
// models are the only shared resource between a client and server running
// on the same machine.
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#ifdef HAVE_STRING_H
# include <string.h>
#endif
#ifdef HAVE_STRINGS_H
# include <strings.h>
#endif
#include "QF/cvar.h"
#include "QF/dstring.h"
#include "QF/image.h"
#include "QF/qendian.h"
#include "QF/quakefs.h"
#include "QF/sys.h"
#include "QF/va.h"
#include "QF/GL/qf_textures.h"
#include "compat.h"
#include "mod_internal.h"
#include "r_internal.h"
static gltex_t gl_notexture = { };
static tex_t *
Mod_LoadAnExternalTexture (char *tname, char *mname)
{
char rname[32];
tex_t *image;
memcpy (rname, tname, strlen (tname) + 1);
if (rname[0] == '*') rname[0] = '#';
image = LoadImage (va (0, "textures/%.*s/%s", (int) strlen (mname + 5) - 4,
mname + 5, rname), 1);
if (!image)
image = LoadImage (va (0, "maps/%.*s/%s", (int) strlen (mname + 5) - 4,
mname + 5, rname), 1);
// if (!image)
// image = LoadImage (va (0, "textures/bmodels/%s", rname));
if (!image)
image = LoadImage (va (0, "textures/%s", rname), 1);
if (!image)
image = LoadImage (va (0, "maps/%s", rname), 1);
return image;
}
static int
Mod_LoadExternalTextures (model_t *mod, texture_t *tx)
{
tex_t *base, *luma;
gltex_t *gltx;
int external = 0;
gltx = tx->render;
if ((base = Mod_LoadAnExternalTexture (tx->name, mod->path))) {
external = 1;
gltx->gl_texturenum =
GL_LoadTexture (tx->name, base->width, base->height,
base->data, true, false,
base->format > 2 ? base->format : 1);
luma = Mod_LoadAnExternalTexture (va (0, "%s_luma", tx->name),
mod->path);
if (!luma)
luma = Mod_LoadAnExternalTexture (va (0, "%s_glow", tx->name),
mod->path);
gltx->gl_fb_texturenum = 0;
if (luma) {
gltx->gl_fb_texturenum =
GL_LoadTexture (va (0, "fb_%s", tx->name), luma->width,
luma->height, luma->data, true, true,
luma->format > 2 ? luma->format : 1);
} else if (base->format < 3) {
gltx->gl_fb_texturenum =
Mod_Fullbright (base->data, base->width, base->height,
va (0, "fb_%s", tx->name));
}
}
return external;
}
void
gl_Mod_ProcessTexture (model_t *mod, texture_t *tx)
{
const char *name;
if (!tx) {
r_notexture_mip->render = &gl_notexture;
return;
}
if (gl_textures_external && gl_textures_external->int_val) {
if (Mod_LoadExternalTextures (mod, tx)) {
return;
}
}
if (strncmp (tx->name, "sky", 3) == 0) {
return;
}
gltex_t *gltex = tx->render;
name = va (0, "fb_%s", tx->name);
gltex->gl_fb_texturenum =
Mod_Fullbright ((byte *) (tx + 1), tx->width, tx->height, name);
gltex->gl_texturenum =
GL_LoadTexture (tx->name, tx->width, tx->height, (byte *) (tx + 1),
true, false, 1);
}
void
gl_Mod_LoadLighting (model_t *mod, bsp_t *bsp)
{
byte d;
byte *in, *out, *data;
dstring_t *litfilename = dstring_new ();
size_t i;
int ver;
QFile *lit_file;
mod_brush_t *brush = &mod->brush;
dstring_copystr (litfilename, mod->path);
brush->lightdata = NULL;
if (mod_lightmap_bytes > 1) {
// LordHavoc: check for a .lit file to load
QFS_StripExtension (litfilename->str, litfilename->str);
dstring_appendstr (litfilename, ".lit");
lit_file = QFS_VOpenFile (litfilename->str, 0, mod->vpath);
data = (byte *) QFS_LoadHunkFile (lit_file);
if (data) {
if (data[0] == 'Q' && data[1] == 'L' && data[2] == 'I'
&& data[3] == 'T') {
ver = LittleLong (((int32_t *) data)[1]);
if (ver == 1) {
Sys_MaskPrintf (SYS_DEV, "%s loaded", litfilename->str);
brush->lightdata = data + 8;
return;
} else
Sys_MaskPrintf (SYS_DEV,
"Unknown .lit file version (%d)\n", ver);
} else
Sys_MaskPrintf (SYS_DEV, "Corrupt .lit file (old version?)\n");
}
}
// LordHavoc: oh well, expand the white lighting data
if (!bsp->lightdatasize) {
dstring_delete (litfilename);
return;
}
brush->lightdata = Hunk_AllocName (bsp->lightdatasize * mod_lightmap_bytes,
litfilename->str);
in = bsp->lightdata;
out = brush->lightdata;
if (mod_lightmap_bytes > 1)
for (i = 0; i < bsp->lightdatasize ; i++) {
d = vid.gammatable[*in++];
*out++ = d;
*out++ = d;
*out++ = d;
}
else
for (i = 0; i < bsp->lightdatasize ; i++)
*out++ = vid.gammatable[*in++];
dstring_delete (litfilename);
}
msurface_t *warpface;
static void
BoundPoly (int numverts, float *verts, vec3_t mins, vec3_t maxs)
{
float *v;
int i, j;
mins[0] = mins[1] = mins[2] = 9999;
maxs[0] = maxs[1] = maxs[2] = -9999;
v = verts;
for (i = 0; i < numverts; i++)
for (j = 0; j < 3; j++, v++) {
if (*v < mins[j])
mins[j] = *v;
if (*v > maxs[j])
maxs[j] = *v;
}
}
static void
SubdividePolygon (int numverts, float *verts)
{
float frac, m, s, t;
float dist[64];
float *v;
int b, f, i, j, k;
glpoly_t *poly;
vec3_t mins, maxs;
vec3_t front[64], back[64];
if (numverts < 3 || numverts > 60)
Sys_Error ("numverts = %i", numverts);
BoundPoly (numverts, verts, mins, maxs);
for (i = 0; i < 3; i++) {
m = (mins[i] + maxs[i]) * 0.5;
m = gl_subdivide_size->value * floor (m / gl_subdivide_size->value +
0.5);
if (maxs[i] - m < 8)
continue;
if (m - mins[i] < 8)
continue;
// cut it
v = verts + i;
for (j = 0; j < numverts; j++, v += 3)
dist[j] = *v - m;
// wrap cases
dist[j] = dist[0];
v -= i;
VectorCopy (verts, v);
f = b = 0;
v = verts;
for (j = 0; j < numverts; j++, v += 3) {
if (dist[j] >= 0) {
VectorCopy (v, front[f]);
f++;
}
if (dist[j] <= 0) {
VectorCopy (v, back[b]);
b++;
}
if (dist[j] == 0 || dist[j + 1] == 0)
continue;
if ((dist[j] > 0) != (dist[j + 1] > 0)) {
// clip point
frac = dist[j] / (dist[j] - dist[j + 1]);
for (k = 0; k < 3; k++)
front[f][k] = back[b][k] = v[k] + frac * (v[3 + k] - v[k]);
f++;
b++;
}
}
SubdividePolygon (f, front[0]);
SubdividePolygon (b, back[0]);
return;
}
poly = Hunk_Alloc (sizeof (glpoly_t) + (numverts - 4) * VERTEXSIZE *
sizeof (float));
poly->next = warpface->polys;
warpface->polys = poly;
poly->numverts = numverts;
for (i = 0; i < numverts; i++, verts += 3) {
VectorCopy (verts, poly->verts[i]);
s = DotProduct (verts, warpface->texinfo->vecs[0]);
t = DotProduct (verts, warpface->texinfo->vecs[1]);
poly->verts[i][3] = s;
poly->verts[i][4] = t;
}
}
/*
Mod_SubdivideSurface
Breaks a polygon up along axial 64 unit
boundaries so that turbulent and sky warps
can be done reasonably.
*/
void
gl_Mod_SubdivideSurface (model_t *mod, msurface_t *fa)
{
float *vec;
int lindex, numverts, i;
vec3_t verts[64];
mod_brush_t *brush = &mod->brush;
warpface = fa;
// convert edges back to a normal polygon
numverts = 0;
for (i = 0; i < fa->numedges; i++) {
lindex = brush->surfedges[fa->firstedge + i];
if (lindex > 0)
vec = brush->vertexes[brush->edges[lindex].v[0]].position;
else
vec = brush->vertexes[brush->edges[-lindex].v[1]].position;
VectorCopy (vec, verts[numverts]);
numverts++;
}
if (numverts > 3) {
SubdividePolygon (numverts, verts[0]);
}
}
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