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Massive dynamic light rendering speedup.

This commit is contained in:
Forest Hale 2000-07-02 13:47:00 +00:00
parent fdcf20b4a3
commit 5644666f0c
1 changed files with 68 additions and 38 deletions
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102
source/gl_rsurf.c
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@ -130,24 +130,39 @@ void R_ForceLightUpdate()
/*
R_AddDynamicLights
LordHavoc's lighting
LordHavoc: completely rewrote this, relies on 64bit integer math...
*/
void
R_AddDynamicLights (msurface_t *surf)
int dlightdivtable[8192];
int dlightdivtableinitialized = 0;
/*
===============
R_AddDynamicLights
===============
*/
void R_AddDynamicLights (msurface_t *surf)
{
int lnum;
int sd, td;
float dist, maxdist, radb, brightness, red, green, blue, f;
vec3_t impact, local;
int s, t;
int i;
int smax, tmax;
mtexinfo_t *tex;
int sdtable[18], lnum, td, maxdist, maxdist2, maxdist3, i, s, t, smax, tmax, red, green, blue, j;
unsigned *bl;
float dist, f;
vec3_t impact, local;
// use 64bit integer... shame it's not very standardized...
#if _MSC_VER
__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;
tex = surf->texinfo;
for (lnum=0 ; lnum<MAX_DLIGHTS ; lnum++)
{
@ -156,42 +171,57 @@ R_AddDynamicLights (msurface_t *surf)
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;
local[0] = DotProduct (impact, tex->vecs[0]) + tex->vecs[0][3] - surf->texturemins[0];
local[1] = DotProduct (impact, tex->vecs[1]) + tex->vecs[1][3] - surf->texturemins[1];
f = DotProduct (impact, surf->texinfo->vecs[0]) + surf->texinfo->vecs[0][3] - surf->texturemins[0];
i = f;
dist *= dist;
red = cl_dlights[lnum].color[0];
green = cl_dlights[lnum].color[1];
blue = cl_dlights[lnum].color[2];
// reduce calculations
t = dist*dist;
for (s = 0;s < smax;s++, i -= 16)
sdtable[s] = i*i + t;
maxdist = cl_dlights[lnum].radius*cl_dlights[lnum].radius; // for comparisons to minimum acceptable light
// if (cl_dlights[lnum].dark) // negate for darklight
// radb = cl_dlights[lnum].radius*cl_dlights[lnum].radius*-256.0*16.0; // negate and multiply by 256 for the code below
// else
radb = cl_dlights[lnum].radius*cl_dlights[lnum].radius*256.0*16.0; // multiply by 256 for the code below
f = DotProduct (impact, surf->texinfo->vecs[1]) + surf->texinfo->vecs[1][3] - surf->texturemins[1];
i = f;
maxdist = (int) (cl_dlights[lnum].radius*cl_dlights[lnum].radius); // for comparisons to minimum acceptable light
// 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
// if (!cl_dlights[lnum].dark)
// {
f = cl_dlights[lnum].color[0] * maxdist;red = f;
f = cl_dlights[lnum].color[1] * maxdist;green = f;
f = cl_dlights[lnum].color[2] * maxdist;blue = f;
/*
}
else // negate for darklight
{
f = cl_dlights[lnum].color[0] * -maxdist;red = f;
f = cl_dlights[lnum].color[1] * -maxdist;green = f;
f = cl_dlights[lnum].color[2] * -maxdist;blue = f;
}
*/
bl = blocklights;
for (t = 0 ; t<tmax ; t++)
for (t = 0;t < tmax;t++,i -= 16)
{
td = local[1] - t*16;
td = td*td + dist;
if (td < maxdist) // make sure some part of it is visible on this line
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++)
{
sd = local[0] - s*16;
if ((f = sd*sd+td) < maxdist)
if (sdtable[s] < maxdist2)
{
brightness = radb / f;
*bl++ += brightness * red;
*bl++ += brightness * green;
*bl++ += brightness * blue;
j = dlightdivtable[(sdtable[s]+td) >> 7];
k = (red * j) >> 7;bl[0] += k;
k = (green * j) >> 7;bl[1] += k;
k = (blue * j) >> 7;bl[2] += k;
}
else
bl += 3; // skip pixel
bl += 3;
}
}
else