// utility routines for converting draw primitive format from list of strips to tris
void _ConvertToTris(ushort[] primitiveDataIn, int[] primitiveMatIn, short[] indicesIn, int numPrimIn,
out int numPrimOut, out int numIndicesOut,
DrawPrimitive[] primitivesOut, short[] indicesOut)
{
numPrimOut = -1;
numIndicesOut = 0;
int prevMaterial = -99999;
for (int i = 0; i < numPrimIn; i++)
{
uint newMat = (uint)primitiveMatIn[i];
newMat &= ~DrawPrimitive.TypeMask;
if (newMat != prevMaterial)
{
numPrimOut++;
if (primitivesOut != null)
{
primitivesOut[numPrimOut].Start = (ushort)numIndicesOut;
primitivesOut[numPrimOut].NumElements = 0;
primitivesOut[numPrimOut].MaterialIndex = newMat | DrawPrimitive.Triangles;
}
prevMaterial = (int)newMat;
}
ushort start = primitiveDataIn[i * 2];
ushort numElements = primitiveDataIn[i * 2 + 1];
// gonna depend on what kind of primitive it is...
if ((primitiveMatIn[i] & DrawPrimitive.TypeMask) == DrawPrimitive.Triangles)
{
for (int j = 0; j < numElements; j += 3)
{
if (indicesOut != null)
{
indicesOut[numIndicesOut + 0] = indicesIn[start + j + 0];
indicesOut[numIndicesOut + 1] = indicesIn[start + j + 1];
indicesOut[numIndicesOut + 2] = indicesIn[start + j + 2];
}
if (primitivesOut != null)
primitivesOut[numPrimOut].NumElements += 3;
numIndicesOut += 3;
}
}
else
{
short[] idx = { indicesIn[start + 0], 0, indicesIn[start + 1] };
uint nextIdx = 1;
for (int j = 2; j < numElements; j++)
{
idx[nextIdx] = idx[2];
nextIdx = nextIdx ^ 1;
idx[2] = indicesIn[start + j];
if (idx[0] == idx[1] || idx[1] == idx[2] || idx[2] == idx[0])
continue;
if (indicesOut != null)
{
indicesOut[numIndicesOut + 0] = idx[0];
indicesOut[numIndicesOut + 1] = idx[1];
indicesOut[numIndicesOut + 2] = idx[2];
}
if (primitivesOut != null)
primitivesOut[numPrimOut].NumElements += 3;
numIndicesOut += 3;
}
}
}
numPrimOut++;
}
// utility routines for converting draw primitive format from list of strips...list of strips
void _LeaveAsMultipleStrips(ushort[] primitiveDataIn, int[] primitiveMatIn, short[] indicesIn, int numPrimIn,
out int numPrimOut, out int numIndicesOut,
DrawPrimitive[] primitivesOut, short[] indicesOut)
{
numPrimOut = -1;
numIndicesOut = 0;
int prevMaterial = -99999;
for (int i = 0; i < numPrimIn; i++)
{
int newMat = primitiveMatIn[i];
ushort start = primitiveDataIn[i * 2];
ushort numElements = primitiveDataIn[i * 2 + 1];
numPrimOut++;
if (primitivesOut != null)
{
primitivesOut[numPrimOut].Start = (ushort)numIndicesOut;
primitivesOut[numPrimOut].NumElements = 0;
primitivesOut[numPrimOut].MaterialIndex = (uint)newMat;
}
prevMaterial = newMat;
// gonna depend on what kind of primitive it is...
// from above we know it's the same kind as the one we're building...
if ((primitiveMatIn[i] & DrawPrimitive.TypeMask) == DrawPrimitive.Triangles)
{
// triangles primitive...add to it
for (int j = 0; j < numElements; j += 3)
{
if (indicesOut != null)
{
indicesOut[numIndicesOut + 0] = indicesIn[start + j + 0];
indicesOut[numIndicesOut + 1] = indicesIn[start + j + 1];
indicesOut[numIndicesOut + 2] = indicesIn[start + j + 2];
}
if (primitivesOut != null)
primitivesOut[numPrimOut].NumElements += 3;
numIndicesOut += 3;
}
}
else
{
// strip primitive...add to it
if (indicesOut != null)
{
for (int j = 0; j < numElements; j++)
indicesOut[numIndicesOut + j] = indicesIn[start + j];
}
if (primitivesOut != null)
primitivesOut[numPrimOut].NumElements = numElements;
numIndicesOut += numElements;
}
}
numPrimOut++;
}
// utility routines for converting draw primitive format from list of strips to one big uber strip
void _ConvertToSingleStrip(ushort[] primitiveDataIn, int[] primitiveMatIn, short[] indicesIn, int numPrimIn,
out int numPrimOut, out int numIndicesOut,
DrawPrimitive[] primitivesOut, short[] indicesOut)
{
numPrimOut = -1;
numIndicesOut = 0;
int prevMaterial = -99999;
int curDrawOut = 0;
for (int i = 0; i < numPrimIn; i++)
{
int newMat = primitiveMatIn[i];
if (newMat != prevMaterial)
{
numPrimOut++;
if (primitivesOut != null)
{
primitivesOut[numPrimOut].Start = (ushort)numIndicesOut;
primitivesOut[numPrimOut].NumElements = 0;
primitivesOut[numPrimOut].MaterialIndex = (uint)newMat;
}
curDrawOut = 0;
prevMaterial = newMat;
}
ushort start = primitiveDataIn[i * 2];
ushort numElements = primitiveDataIn[i * 2 + 1];
// gonna depend on what kind of primitive it is...
// from above we know it's the same kind as the one we're building...
if ((primitiveMatIn[i] & DrawPrimitive.TypeMask) == DrawPrimitive.Triangles)
{
// triangles primitive...add to it
for (int j = 0; j < numElements; j += 3)
{
if (indicesOut != null)
{
indicesOut[numIndicesOut + 0] = indicesIn[start + j + 0];
indicesOut[numIndicesOut + 1] = indicesIn[start + j + 1];
indicesOut[numIndicesOut + 2] = indicesIn[start + j + 2];
}
if (primitivesOut != null)
primitivesOut[numPrimOut].NumElements += 3;
numIndicesOut += 3;
}
}
else
{
// strip primitive...add to it
if (indicesOut != null)
{
if ((curDrawOut & 1) != 0)
{
indicesOut[numIndicesOut + 0] = indicesOut[numIndicesOut - 1];
indicesOut[numIndicesOut + 1] = indicesOut[numIndicesOut - 1];
indicesOut[numIndicesOut + 2] = indicesIn[start];
for (int j = 0; j < numElements; j++)
indicesOut[numIndicesOut + 3 + j] = indicesIn[start + j];
}
else if (curDrawOut != 0)
{
indicesOut[numIndicesOut + 0] = indicesOut[numIndicesOut - 1];
indicesOut[numIndicesOut + 1] = indicesIn[start];
for (int j = 0; j < numElements; j++)
indicesOut[numIndicesOut + 2 + j] = indicesIn[start + j];
}
else
{
for (int j = 0; j < numElements; j++)
indicesOut[numIndicesOut + j] = indicesIn[start + j];
}
}
ushort added = numElements;
added += (ushort)((curDrawOut != 0) ? (((curDrawOut & 1) != 0) ? 3 : 2) : 0);
if (primitivesOut != null)
primitivesOut[numPrimOut].NumElements += added;
numIndicesOut += added;
curDrawOut += added;
}
}
numPrimOut++;
}
