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quakeforge/libs/video/renderer/gl/gl_lightmap.c
Bill Currie 12c84046f3 [cvar] Make cvars properly typed 
This is an extremely extensive patch as it hits every cvar, and every
usage of the cvars. Cvars no longer store the value they control,
instead, they use a cexpr value object to reference the value and
specify the value's type (currently, a null type is used for strings).
Non-string cvars are passed through cexpr, allowing expressions in the
cvars' settings. Also, cvars have returned to an enhanced version of the
original (id quake) registration scheme.

As a minor benefit, relevant code having direct access to the
cvar-controlled variables is probably a slight optimization as it
removed a pointer dereference, and the variables can be located for data
locality.

The static cvar descriptors are made private as an additional safety
layer, though there's nothing stopping external modification via
Cvar_FindVar (which is needed for adding listeners).

While not used yet (partly due to working out the design), cvars can
have a validation function.

Registering a cvar allows a primary listener (and its data) to be
specified: it will always be called first when the cvar is modified. The
combination of proper listeners and direct access to the controlled
variable greatly simplifies the more complex cvar interactions as much
less null checking is required, and there's no need for one cvar's
callback to call another's.

nq-x11 is known to work at least well enough for the demos. More testing
will come.
2022-04-24 19:15:22 +09:00

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/*
gl_lightmap.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
*/
#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 <math.h>
#include <stdio.h>
#include "QF/cvar.h"
#include "QF/render.h"
#include "QF/sys.h"
#include "QF/scene/entity.h"
#include "QF/GL/defines.h"
#include "QF/GL/funcs.h"
#include "QF/GL/qf_lightmap.h"
#include "QF/GL/qf_rmain.h"
#include "QF/GL/qf_rsurf.h"
#include "QF/GL/qf_sky.h"
#include "QF/GL/qf_textures.h"
#include "QF/GL/qf_vid.h"
#include "compat.h"
#include "r_internal.h"
static int dlightdivtable[8192];
static int gl_internalformat; // 1 or 3
static int lightmap_bytes; // 1, 3, or 4
GLuint gl_lightmap_textures[MAX_LIGHTMAPS];
// keep lightmap texture data in main memory so texsubimage can update properly
// LordHavoc: changed to be allocated at runtime (typically lower memory usage)
static byte *lightmaps[MAX_LIGHTMAPS];
static unsigned int blocklights[34 * 34 * 3]; //FIXME make dynamic
static int allocated[MAX_LIGHTMAPS][BLOCK_WIDTH];
qboolean gl_lightmap_modified[MAX_LIGHTMAPS];
instsurf_t *gl_lightmap_polys[MAX_LIGHTMAPS];
glRect_t gl_lightmap_rectchange[MAX_LIGHTMAPS];
static int lmshift = 7;
void (*gl_R_BuildLightMap) (const transform_t *transform, mod_brush_t *brush,
msurface_t *surf);
void
gl_lightmap_init (void)
{
int s;
memset (&lightmaps, 0, sizeof (lightmaps));
dlightdivtable[0] = 1048576 >> 7;
for (s = 1; s < 8192; s++)
dlightdivtable[s] = 1048576 / (s << 7);
}
static inline void
R_AddDynamicLights_1 (const transform_t *transform, msurface_t *surf)
{
float dist;
unsigned int maxdist, maxdist2, maxdist3;
int smax, smax_bytes, tmax,
grey, s, t;
unsigned int lnum, td, i, j;
unsigned int sdtable[18];
unsigned int *bl;
vec3_t impact, local;
vec4f_t entorigin = { 0, 0, 0, 1 };
smax = (surf->extents[0] >> 4) + 1;
smax_bytes = smax * gl_internalformat;
tmax = (surf->extents[1] >> 4) + 1;
if (transform) {
//FIXME give world entity a transform
entorigin = Transform_GetWorldPosition (transform);
}
for (lnum = 0; lnum < r_maxdlights; lnum++) {
if (!(surf->dlightbits[lnum / 32] & (1 << (lnum % 32))))
continue; // not lit by this light
VectorSubtract (r_dlights[lnum].origin, entorigin, local);
dist = DotProduct (local, surf->plane->normal) - surf->plane->dist;
VectorMultSub (r_dlights[lnum].origin, dist, surf->plane->normal,
impact);
i = 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 = DotProduct (impact, surf->texinfo->vecs[1]) +
surf->texinfo->vecs[1][3] - surf->texturemins[1];
// for comparisons to minimum acceptable light
maxdist = (int) (r_dlights[lnum].radius * r_dlights[lnum].radius);
// clamp radius to avoid exceeding 8192 entry division table
if (maxdist > 1048576)
maxdist = 1048576;
maxdist3 = maxdist - t;
// convert to 8.8 blocklights format
grey = (r_dlights[lnum].color[0] + r_dlights[lnum].color[1] +
r_dlights[lnum].color[2]) * maxdist / 3.0;
bl = blocklights;
for (t = 0; t < tmax; t++, i -= 16) {
td = i * i;
if (td < maxdist3) { // ensure part 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++ += (grey * j) >> 7;
} else
bl++;
}
} else
bl += smax_bytes; // skip line
}
}
}
static inline void
R_AddDynamicLights_3 (const transform_t *transform, msurface_t *surf)
{
float dist;
unsigned int maxdist, maxdist2, maxdist3;
int smax, smax_bytes, tmax,
red, green, blue, s, t;
unsigned int lnum, td, i, j;
unsigned int sdtable[18];
unsigned int *bl;
vec3_t impact, local;
vec4f_t entorigin = { 0, 0, 0, 1 };
smax = (surf->extents[0] >> 4) + 1;
smax_bytes = smax * gl_internalformat;
tmax = (surf->extents[1] >> 4) + 1;
if (transform) {
entorigin = Transform_GetWorldPosition (transform);
}
for (lnum = 0; lnum < r_maxdlights; lnum++) {
if (!(surf->dlightbits[lnum / 32] & (1 << (lnum % 32))))
continue; // not lit by this light
VectorSubtract (r_dlights[lnum].origin, entorigin, local);
dist = DotProduct (local, surf->plane->normal) - surf->plane->dist;
VectorMultSub (r_dlights[lnum].origin, dist, surf->plane->normal,
impact);
i = 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 = DotProduct (impact, surf->texinfo->vecs[1]) +
surf->texinfo->vecs[1][3] - surf->texturemins[1];
// for comparisons to minimum acceptable light
maxdist = (int) (r_dlights[lnum].radius * r_dlights[lnum].radius);
// clamp radius to avoid exceeding 8192 entry division table
if (maxdist > 1048576)
maxdist = 1048576;
maxdist3 = maxdist - t;
// convert to 8.8 blocklights format
red = r_dlights[lnum].color[0] * maxdist;
green = r_dlights[lnum].color[1] * maxdist;
blue = r_dlights[lnum].color[2] * maxdist;
bl = blocklights;
for (t = 0; t < tmax; t++, i -= 16) {
td = i * i;
if (td < maxdist3) { // ensure part 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++ += (red * j) >> 7;
*bl++ += (green * j) >> 7;
*bl++ += (blue * j) >> 7;
} else
bl += 3;
}
} else
bl += smax_bytes; // skip line
}
}
}
static void
R_BuildLightMap_1 (const transform_t *transform, mod_brush_t *brush,
msurface_t *surf)
{
byte *dest;
int maps, size, stride, smax, tmax, i, j;
unsigned int scale;
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 * gl_internalformat;
// set to full bright if no light data
if (!brush->lightdata) {
memset (&blocklights[0], 0xff, size * sizeof(int));
goto store;
}
// clear to no light
memset (&blocklights[0], 0, size * sizeof(int));
// add all the lightmaps
if (surf->samples) {
byte *lightmap;
lightmap = surf->samples;
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;
}
}
}
// add all the dynamic lights
if (surf->dlightframe == r_framecount)
R_AddDynamicLights_1 (transform, surf);
store:
// bound and shift
// Also, invert because we're using a diff blendfunc now
stride = (BLOCK_WIDTH - smax) * lightmap_bytes;
bl = blocklights;
dest = lightmaps[surf->lightmaptexturenum]
+ (surf->light_t * BLOCK_WIDTH + surf->light_s) * lightmap_bytes;
for (i = 0; i < tmax; i++, dest += stride) {
for (j = smax; j; j--) {
*dest++ = min (*bl >> lmshift, 255);
bl++;
}
}
}
static void
R_BuildLightMap_3 (const transform_t *transform, mod_brush_t *brush,
msurface_t *surf)
{
byte *dest;
int maps, size, stride, smax, tmax, i, j;
unsigned int scale;
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 * gl_internalformat;
// set to full bright if no light data
if (!brush->lightdata) {
memset (&blocklights[0], 0xff, size * sizeof(int));
goto store;
}
// clear to no light
memset (&blocklights[0], 0, size * sizeof(int));
// add all the lightmaps
if (surf->samples) {
byte *lightmap;
lightmap = surf->samples;
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 < smax * tmax; i++) {
*bl++ += *lightmap++ * scale;
*bl++ += *lightmap++ * scale;
*bl++ += *lightmap++ * scale;
}
}
}
// add all the dynamic lights
if (surf->dlightframe == r_framecount)
R_AddDynamicLights_3 (transform, surf);
store:
// bound and shift
// and invert too
stride = (BLOCK_WIDTH - smax) * lightmap_bytes;
bl = blocklights;
dest = lightmaps[surf->lightmaptexturenum]
+ (surf->light_t * BLOCK_WIDTH + surf->light_s) * lightmap_bytes;
for (i = 0; i < tmax; i++, dest += stride) {
for (j = 0; j < smax; j++) {
*dest++ = min (*bl >> lmshift, 255);
bl++;
*dest++ = min (*bl >> lmshift, 255);
bl++;
*dest++ = min (*bl >> lmshift, 255);
bl++;
}
}
}
static void
R_BuildLightMap_4 (const transform_t *transform, mod_brush_t *brush,
msurface_t *surf)
{
byte *dest;
int maps, size, smax, tmax, i, j, stride;
unsigned int scale;
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 * gl_internalformat;
// set to full bright if no light data
if (!brush->lightdata) {
memset (&blocklights[0], 0xff, size * sizeof(int));
goto store;
}
// clear to no light
memset (&blocklights[0], 0, size * sizeof(int));
// add all the lightmaps
if (surf->samples) {
byte *lightmap;
lightmap = surf->samples;
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 < smax * tmax; i++) {
*bl++ += *lightmap++ * scale;
*bl++ += *lightmap++ * scale;
*bl++ += *lightmap++ * scale;
}
}
}
// add all the dynamic lights
if (surf->dlightframe == r_framecount)
R_AddDynamicLights_3 (transform, surf);
store:
// bound and shift
// and invert too
stride = (BLOCK_WIDTH - smax) * lightmap_bytes;
bl = blocklights;
dest = lightmaps[surf->lightmaptexturenum]
+ (surf->light_t * BLOCK_WIDTH + surf->light_s) * lightmap_bytes;
for (i = 0; i < tmax; i++, dest += stride) {
for (j = 0; j < smax; j++) {
*dest++ = min (*bl >> lmshift, 255);
bl++;
*dest++ = min (*bl >> lmshift, 255);
bl++;
*dest++ = min (*bl >> lmshift, 255);
bl++;
*dest++ = 255;
}
}
}
// BRUSH MODELS ===============================================================
static inline void
do_subimage_2 (int i)
{
byte *block, *lm, *b;
int stride, width;
glRect_t *rect = &gl_lightmap_rectchange[i];
width = rect->w * lightmap_bytes;
stride = BLOCK_WIDTH * lightmap_bytes;
b = block = Hunk_TempAlloc (0, rect->h * width);
lm = lightmaps[i] + (rect->t * BLOCK_WIDTH + rect->l) * lightmap_bytes;
for (i = rect->h; i > 0; i--) {
memcpy (b, lm, width);
b += width;
lm += stride;
}
qfglTexSubImage2D (GL_TEXTURE_2D, 0, rect->l, rect->t, rect->w, rect->h,
gl_lightmap_format, GL_UNSIGNED_BYTE, block);
}
static void
GL_UploadLightmap (int i)
{
switch (gl_lightmap_subimage) {
case 2:
do_subimage_2 (i);
break;
case 1:
qfglTexSubImage2D (GL_TEXTURE_2D, 0, 0, gl_lightmap_rectchange[i].t,
BLOCK_WIDTH, gl_lightmap_rectchange[i].h,
gl_lightmap_format, GL_UNSIGNED_BYTE,
lightmaps[i] + (gl_lightmap_rectchange[i].t *
BLOCK_WIDTH) * lightmap_bytes);
break;
default:
case 0:
qfglTexImage2D (GL_TEXTURE_2D, 0, gl_internalformat, BLOCK_WIDTH,
BLOCK_HEIGHT, 0, gl_lightmap_format, GL_UNSIGNED_BYTE,
lightmaps[i]);
break;
}
}
void
gl_R_CalcLightmaps (void)
{
int i;
for (i = 0; i < MAX_LIGHTMAPS; i++) {
if (!gl_lightmap_polys[i])
continue;
if (gl_lightmap_modified[i]) {
qfglBindTexture (GL_TEXTURE_2D, gl_lightmap_textures[i]);
GL_UploadLightmap (i);
gl_lightmap_modified[i] = false;
}
}
}
void
gl_R_BlendLightmaps (void)
{
float *v;
int i, j;
instsurf_t *sc;
glpoly_t *p;
qfglDepthMask (GL_FALSE); // don't bother writing Z
qfglBlendFunc (lm_src_blend, lm_dest_blend);
for (i = 0; i < MAX_LIGHTMAPS; i++) {
for (sc = gl_lightmap_polys[i]; sc; sc = sc->lm_chain) {
qfglBindTexture (GL_TEXTURE_2D, gl_lightmap_textures[i]);
if (sc->transform) {
qfglPushMatrix ();
qfglLoadMatrixf (sc->transform);
}
for (p = sc->surface->polys; p; p = p->next) {
qfglBegin (GL_POLYGON);
v = p->verts[0];
for (j = 0; j < p->numverts; j++, v += VERTEXSIZE) {
qfglTexCoord2fv (&v[5]);
qfglVertex3fv (v);
}
qfglEnd ();
}
if (sc->transform)
qfglPopMatrix ();
}
}
// Return to normal blending --KB
qfglBlendFunc (GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
qfglDepthMask (GL_TRUE); // back to normal Z buffering
}
void
gl_overbright_f (void *data, const cvar_t *cvar)
{
int num;
mod_brush_t *brush;
if (!cvar)
return;
if (gl_overbright) {
if (!gl_combine_capable && gl_mtex_capable) {
Sys_Printf ("Warning: gl_overbright has no effect with "
"gl_multitexture enabled if you don't have "
"GL_COMBINE support in your driver.\n");
lm_src_blend = GL_ZERO;
lm_dest_blend = GL_SRC_COLOR;
lmshift = 7;
gl_rgb_scale = 1.0;
} else {
lm_src_blend = GL_DST_COLOR;
lm_dest_blend = GL_SRC_COLOR;
switch (gl_overbright) {
case 2:
lmshift = 9;
gl_rgb_scale = 4.0;
break;
case 1:
lmshift = 8;
gl_rgb_scale = 2.0;
break;
default:
lmshift = 7;
gl_rgb_scale = 1.0;
break;
}
}
} else {
lm_src_blend = GL_ZERO;
lm_dest_blend = GL_SRC_COLOR;
lmshift = 7;
gl_rgb_scale = 1.0;
}
if (!gl_R_BuildLightMap)
return;
brush = &r_refdef.worldmodel->brush;
for (unsigned i = 0; i < brush->numsurfaces; i++) {
msurface_t *surf = brush->surfaces + i;
if (surf->flags & (SURF_DRAWTURB | SURF_DRAWSKY))
continue;
num = surf->lightmaptexturenum;
gl_lightmap_modified[num] = true;
gl_lightmap_rectchange[num].l = 0;
gl_lightmap_rectchange[num].t = 0;
gl_lightmap_rectchange[num].w = BLOCK_WIDTH;
gl_lightmap_rectchange[num].h = BLOCK_HEIGHT;
gl_R_BuildLightMap (0, brush, surf);
}
}
// LIGHTMAP ALLOCATION ========================================================
// returns a texture number and the position inside it
static int
AllocBlock (int w, int h, int *x, int *y)
{
int best, best2, texnum, i, j;
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,
lightmap_bytes);
for (i = 0; i < w; i++)
allocated[texnum][*x + i] = best + h;
return texnum;
}
Sys_Error ("AllocBlock: full");
return 0;
}
static void
GL_CreateSurfaceLightmap (mod_brush_t *brush, msurface_t *surf)
{
int smax, tmax;
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);
gl_R_BuildLightMap (0, brush, surf);
}
/*
GL_BuildLightmaps
Builds the lightmap texture with all the surfaces from all brush models
*/
void
GL_BuildLightmaps (model_t **models, int num_models)
{
model_t *m;
mod_brush_t *brush;
memset (allocated, 0, sizeof (allocated));
r_framecount = 1; // no dlightcache
if (!gl_lightmap_textures[0]) {
qfglGenTextures (MAX_LIGHTMAPS, gl_lightmap_textures);
}
switch (r_lightmap_components) {
case 1:
gl_internalformat = 1;
gl_lightmap_format = GL_LUMINANCE;
lightmap_bytes = 1;
gl_R_BuildLightMap = R_BuildLightMap_1;
break;
case 3:
gl_internalformat = 3;
if (gl_use_bgra)
gl_lightmap_format = GL_BGR;
else
gl_lightmap_format = GL_RGB;
lightmap_bytes = 3;
gl_R_BuildLightMap = R_BuildLightMap_3;
break;
case 4:
default:
gl_internalformat = 3;
if (gl_use_bgra)
gl_lightmap_format = GL_BGRA;
else
gl_lightmap_format = GL_RGBA;
lightmap_bytes = 4;
gl_R_BuildLightMap = R_BuildLightMap_4;
break;
}
for (int j = 1; j < num_models; j++) {
m = models[j];
if (!m)
break;
if (m->path[0] == '*' || m->type != mod_brush) {
// sub model surfaces are processed as part of the main model
continue;
}
brush = &m->brush;
gl_currentmodel = m;
// non-bsp models don't have surfaces.
for (unsigned i = 0; i < brush->numsurfaces; i++) {
if (brush->surfaces[i].flags & (SURF_DRAWTURB | SURF_DRAWSKY))
continue;
GL_CreateSurfaceLightmap (brush, brush->surfaces + i);
GL_BuildSurfaceDisplayList (brush, brush->surfaces + i);
}
}
// upload all lightmaps that were filled
for (int i = 0; i < MAX_LIGHTMAPS; i++) {
if (!allocated[i][0])
break; // no more used
gl_lightmap_modified[i] = false;
gl_lightmap_rectchange[i].l = BLOCK_WIDTH;
gl_lightmap_rectchange[i].t = BLOCK_HEIGHT;
gl_lightmap_rectchange[i].w = 0;
gl_lightmap_rectchange[i].h = 0;
qfglBindTexture (GL_TEXTURE_2D, gl_lightmap_textures[i]);
qfglTexParameterf (GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
qfglTexParameterf (GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
if (gl_Anisotropy)
qfglTexParameterf (GL_TEXTURE_2D, GL_TEXTURE_MAX_ANISOTROPY_EXT,
gl_aniso);
qfglTexImage2D (GL_TEXTURE_2D, 0, lightmap_bytes, BLOCK_WIDTH,
BLOCK_HEIGHT, 0, gl_lightmap_format,
GL_UNSIGNED_BYTE, lightmaps[i]);
}
}
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