void LLVOSurfacePatch::updateFaceSize(S32 idx)
{
if (idx != 0)
{
llwarns << "Terrain partition requested invalid face!!!" << llendl;
return;
}
LLFace* facep = mDrawable->getFace(idx);
S32 num_vertices = 0;
S32 num_indices = 0;
if (mLastStride)
{
getGeomSizesMain(mLastStride, num_vertices, num_indices);
getGeomSizesNorth(mLastStride, mLastNorthStride, num_vertices, num_indices);
getGeomSizesEast(mLastStride, mLastEastStride, num_vertices, num_indices);
}
facep->setSize(num_vertices, num_indices);
}
void LLVOSurfacePatch::updateMainGeometry(LLFace *facep,
LLStrider<LLVector3> &verticesp,
LLStrider<LLVector3> &normalsp,
LLStrider<LLVector2> &texCoords0p,
LLStrider<LLVector2> &texCoords1p,
LLStrider<U16> &indicesp,
U32 &index_offset)
{
S32 i, j, x, y;
U32 patch_size, render_stride;
S32 num_vertices, num_indices;
U32 index;
llassert(mLastStride > 0);
render_stride = mLastStride;
patch_size = mPatchp->getSurface()->getGridsPerPatchEdge();
S32 vert_size = patch_size / render_stride;
///////////////////////////
//
// Render the main patch
//
//
num_vertices = 0;
num_indices = 0;
// First, figure out how many vertices we need...
getGeomSizesMain(render_stride, num_vertices, num_indices);
if (num_vertices > 0)
{
facep->mCenterAgent = mPatchp->getPointAgent(8, 8);
// Generate patch points first
for (j = 0; j < vert_size; j++)
{
for (i = 0; i < vert_size; i++)
{
x = i * render_stride;
y = j * render_stride;
mPatchp->eval(x, y, render_stride, verticesp.get(), normalsp.get(), texCoords0p.get(), texCoords1p.get());
verticesp++;
normalsp++;
texCoords0p++;
texCoords1p++;
}
}
for (j = 0; j < (vert_size - 1); j++)
{
if (j % 2)
{
for (i = (vert_size - 1); i > 0; i--)
{
index = (i - 1)+ j*vert_size;
*(indicesp++) = index_offset + index;
index = i + (j+1)*vert_size;
*(indicesp++) = index_offset + index;
index = (i - 1) + (j+1)*vert_size;
*(indicesp++) = index_offset + index;
index = (i - 1) + j*vert_size;
*(indicesp++) = index_offset + index;
index = i + j*vert_size;
*(indicesp++) = index_offset + index;
index = i + (j+1)*vert_size;
*(indicesp++) = index_offset + index;
}
}
else
{
for (i = 0; i < (vert_size - 1); i++)
{
index = i + j*vert_size;
*(indicesp++) = index_offset + index;
index = (i + 1) + (j+1)*vert_size;
*(indicesp++) = index_offset + index;
index = i + (j+1)*vert_size;
*(indicesp++) = index_offset + index;
index = i + j*vert_size;
*(indicesp++) = index_offset + index;
index = (i + 1) + j*vert_size;
*(indicesp++) = index_offset + index;
index = (i + 1) + (j + 1)*vert_size;
*(indicesp++) = index_offset + index;
}
}
}
}
index_offset += num_vertices;
}
