public static void BuildSurfaceDisplayList(msurface_t fa)
{
// reconstruct the polygon
medge_t[] pedges = currentmodel.edges;
int lnumverts = fa.numedges;
//
// draw texture
//
glpoly_t poly = new glpoly_t();
poly.AllocVerts(lnumverts);
poly.next = fa.polys;
poly.flags = fa.flags;
fa.polys = poly;
ushort[] r_pedge_v;
Vector3 vec;
for (int i = 0; i < lnumverts; i++)
{
int lindex = currentmodel.surfedges[fa.firstedge + i];
if (lindex > 0)
{
r_pedge_v = pedges[lindex].v;
vec = r_pcurrentvertbase[r_pedge_v[0]].position;
}
else
{
r_pedge_v = pedges[-lindex].v;
vec = r_pcurrentvertbase[r_pedge_v[1]].position;
}
float s = Mathlib.DotProduct(ref vec, ref fa.texinfo.vecs[0]) + fa.texinfo.vecs[0].W;
s /= fa.texinfo.texture.width;
float t = Mathlib.DotProduct(ref vec, ref fa.texinfo.vecs[1]) + fa.texinfo.vecs[1].W;
t /= fa.texinfo.texture.height;
poly.verts[i][0] = vec.X;
poly.verts[i][1] = vec.Y;
poly.verts[i][2] = vec.Z;
poly.verts[i][3] = s;
poly.verts[i][4] = t;
//
// lightmap texture coordinates
//
s = Mathlib.DotProduct(ref vec, ref fa.texinfo.vecs[0]) + fa.texinfo.vecs[0].W;
s -= fa.texturemins[0];
s += fa.light_s * 16;
s += 8;
s /= BLOCK_WIDTH * 16;
t = Mathlib.DotProduct(ref vec, ref fa.texinfo.vecs[1]) + fa.texinfo.vecs[1].W;
t -= fa.texturemins[1];
t += fa.light_t * 16;
t += 8;
t /= BLOCK_HEIGHT * 16;
poly.verts[i][5] = s;
poly.verts[i][6] = t;
}
//
// remove co-linear points - Ed
//
if (gl_keeptjunctions.value == 0 && (fa.flags & q_shared.SURF_UNDERWATER) == 0)
{
for (int i = 0; i < lnumverts; ++i)
{
if (IsCollinear(poly.verts[(i + lnumverts - 1) % lnumverts],
poly.verts[i],
poly.verts[(i + 1) % lnumverts]))
{
int j;
for (j = i + 1; j < lnumverts; ++j)
{
//int k;
for (int k = 0; k < q_shared.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;
}
static void SubdividePolygon(int numverts, Vector3[] verts)
{
if (numverts > 60)
{
Sys_Error("numverts = {0}", numverts);
}
Vector3 mins, maxs;
BoundPoly(numverts, verts, out mins, out maxs);
float[] dist = new float[64];
for (int i = 0; i < 3; i++)
{
double m = (Mathlib.Comp(ref mins, i) + Mathlib.Comp(ref maxs, i)) * 0.5;
m = gl_subdivide_size.value * Math.Floor(m / gl_subdivide_size.value + 0.5);
if (Mathlib.Comp(ref maxs, i) - m < 8)
{
continue;
}
if (m - Mathlib.Comp(ref mins, i) < 8)
{
continue;
}
for (int j = 0; j < numverts; j++)
{
dist[j] = (float)(Mathlib.Comp(ref verts[j], i) - m);
}
Vector3[] front = new Vector3[64];
Vector3[] back = new Vector3[64];
// cut it
// wrap cases
dist[numverts] = dist[0];
verts[numverts] = verts[0]; // Uze: source array must be at least numverts + 1 elements long
int f = 0, b = 0;
for (int j = 0; j < numverts; j++)
{
if (dist[j] >= 0)
{
front[f] = verts[j];
f++;
}
if (dist[j] <= 0)
{
back[b] = verts[j];
b++;
}
if (dist[j] == 0 || dist[j + 1] == 0)
{
continue;
}
if ((dist[j] > 0) != (dist[j + 1] > 0))
{
// clip point
float frac = dist[j] / (dist[j] - dist[j + 1]);
front[f] = back[b] = verts[j] + (verts[j + 1] - verts[j]) * frac;
f++;
b++;
}
}
SubdividePolygon(f, front);
SubdividePolygon(b, back);
return;
}
glpoly_t poly = new glpoly_t();
poly.next = _WarpFace.polys;
_WarpFace.polys = poly;
poly.AllocVerts(numverts);
for (int i = 0; i < numverts; i++)
{
Copy(ref verts[i], poly.verts[i]);
float s = Vector3.Dot(verts[i], _WarpFace.texinfo.vecs[0].Xyz);
float t = Vector3.Dot(verts[i], _WarpFace.texinfo.vecs[1].Xyz);
poly.verts[i][3] = s;
poly.verts[i][4] = t;
}
}