void PrepareWrite(int nVertexNumb)
{
mVerts.CleanPreWrite(nVertexNumb);
mOffset.CleanPreWrite(nVertexNumb);
mUvs.CleanPreWrite(nVertexNumb);
mCols.CleanPreWrite(nVertexNumb);
}
void AdjustIndexs(int nVertexCount)
{
int nOldSize = mIndices.size;
int nNewSize = mVerts.size / 4 * 6;
mIndices.CleanPreWrite(nVertexCount / 4 * 6);
// 填充多余的
int nMaxCount = mIndices.buffer.Length;
int[] Indices = mIndices.buffer;
int index = 0;
int i = 0;
for (; i < nVertexCount; i += 4)
{
Indices[index++] = i;
Indices[index++] = i + 1;
Indices[index++] = i + 2;
Indices[index++] = i + 2;
Indices[index++] = i + 3;
Indices[index++] = i;
}
int nLast = nVertexCount - 1;
for (; index < nMaxCount;)
{
Indices[index++] = nLast;
Indices[index++] = nLast;
Indices[index++] = nLast;
Indices[index++] = nLast;
Indices[index++] = nLast;
Indices[index++] = nLast;
}
mIndices.size = index;
}
