static int RecursiveLightPoint(mnodebase_t node, ref Vector3 start, ref Vector3 end)
{
if (node.contents < 0)
{
return(-1); // didn't hit anything
}
mnode_t n = (mnode_t)node;
// calculate mid point
// FIXME: optimize for axial
mplane_t plane = n.plane;
float front = Vector3.Dot(start, plane.normal) - plane.dist;
float back = Vector3.Dot(end, plane.normal) - plane.dist;
int side = front < 0 ? 1 : 0;
if ((back < 0 ? 1 : 0) == side)
{
return(RecursiveLightPoint(n.children[side], ref start, ref end));
}
float frac = front / (front - back);
Vector3 mid = start + (end - start) * frac;
// go down front side
int r = RecursiveLightPoint(n.children[side], ref start, ref mid);
if (r >= 0)
{
return(r); // hit something
}
if ((back < 0 ? 1 : 0) == side)
{
return(-1); // didn't hit anuthing
}
// check for impact on this node
_LightSpot = mid;
_LightPlane = plane;
msurface_t[] surf = Client.cl.worldmodel.surfaces;
int offset = n.firstsurface;
for (int i = 0; i < n.numsurfaces; i++, offset++)
{
if ((surf[offset].flags & Surf.SURF_DRAWTILED) != 0)
{
continue; // no lightmaps
}
mtexinfo_t tex = surf[offset].texinfo;
int s = (int)(Vector3.Dot(mid, tex.vecs[0].Xyz) + tex.vecs[0].W);
int t = (int)(Vector3.Dot(mid, tex.vecs[1].Xyz) + tex.vecs[1].W);
if (s < surf[offset].texturemins[0] || t < surf[offset].texturemins[1])
{
continue;
}
int ds = s - surf[offset].texturemins[0];
int dt = t - surf[offset].texturemins[1];
if (ds > surf[offset].extents[0] || dt > surf[offset].extents[1])
{
continue;
}
if (surf[offset].sample_base == null)
{
return(0);
}
ds >>= 4;
dt >>= 4;
byte[] lightmap = surf[offset].sample_base;
int lmOffset = surf[offset].sampleofs;
short[] extents = surf[offset].extents;
r = 0;
if (lightmap != null)
{
lmOffset += dt * ((extents[0] >> 4) + 1) + ds;
for (int maps = 0; maps < BspFile.MAXLIGHTMAPS && surf[offset].styles[maps] != 255; maps++)
{
int scale = _LightStyleValue[surf[offset].styles[maps]];
r += lightmap[lmOffset] * scale;
lmOffset += ((extents[0] >> 4) + 1) * ((extents[1] >> 4) + 1);
}
r >>= 8;
}
return(r);
}
// go down back side
return(RecursiveLightPoint(n.children[side == 0 ? 1 : 0], ref mid, ref end));
}
/// <summary>
/// R_AddDynamicLights
/// </summary>
static void AddDynamicLights(msurface_t surf)
{
int smax = (surf.extents[0] >> 4) + 1;
int tmax = (surf.extents[1] >> 4) + 1;
mtexinfo_t tex = surf.texinfo;
dlight_t[] dlights = Client.DLights;
for (int lnum = 0; lnum < Client.MAX_DLIGHTS; lnum++)
{
if ((surf.dlightbits & (1 << lnum)) == 0)
{
continue; // not lit by this light
}
float rad = dlights[lnum].radius;
float dist = Vector3.Dot(dlights[lnum].origin, surf.plane.normal) - surf.plane.dist;
rad -= Math.Abs(dist);
float minlight = dlights[lnum].minlight;
if (rad < minlight)
{
continue;
}
minlight = rad - minlight;
Vector3 impact = dlights[lnum].origin - surf.plane.normal * dist;
float local0 = Vector3.Dot(impact, tex.vecs[0].Xyz) + tex.vecs[0].W;
float local1 = Vector3.Dot(impact, tex.vecs[1].Xyz) + tex.vecs[1].W;
local0 -= surf.texturemins[0];
local1 -= surf.texturemins[1];
for (int t = 0; t < tmax; t++)
{
int td = (int)(local1 - t * 16);
if (td < 0)
{
td = -td;
}
for (int s = 0; s < smax; s++)
{
int sd = (int)(local0 - s * 16);
if (sd < 0)
{
sd = -sd;
}
if (sd > td)
{
dist = sd + (td >> 1);
}
else
{
dist = td + (sd >> 1);
}
if (dist < minlight)
{
_BlockLights[t * smax + s] += (uint)((rad - dist) * 256);
}
}
}
}
}