internal ovrDistortionMesh(ovrDistortionMesh_Raw raw)
{
this.VertexCount = raw.VertexCount;
this.pVertexData = new ovrDistortionVertex[this.VertexCount];
this.IndexCount = raw.IndexCount;
this.pIndexData = new short[this.IndexCount];
// Copy data
System.Type vertexType = typeof(ovrDistortionVertex);
Int32 vertexSize = Marshal.SizeOf(vertexType);
Int32 indexSize = sizeof(short);
Int64 pvertices = raw.pVertexData.ToInt64();
Int64 pindices = raw.pIndexData.ToInt64();
// TODO: Investigate using Marshal.Copy() or Buffer.BlockCopy() for improved performance
for (int i = 0; i < raw.VertexCount; i++)
{
pVertexData[i] = (ovrDistortionVertex)Marshal.PtrToStructure(new IntPtr(pvertices), vertexType);
pvertices += vertexSize;
}
// Indices are stored as shorts.
for (int j = 0; j < raw.IndexCount; j++)
{
pIndexData[j] = Marshal.ReadInt16(new IntPtr(pindices));
pindices += indexSize;
}
}
// Generate distortion mesh per eye.
// Distortion capabilities will depend on 'distortionCaps' flags; user should rely on
// appropriate shaders based on their settings.
// Distortion mesh data will be allocated and stored into the ovrDistortionMesh data structure,
// which should be explicitly freed with ovrHmd_DestroyDistortionMesh.
// Users should call ovrHmd_GetRenderScaleAndOffset to get uvScale and Offset values for rendering.
// The function shouldn't fail unless theres is a configuration or memory error, in which case
// ovrDistortionMesh values will be set to null.
// This is the only function in the SDK reliant on eye relief, currently imported from profiles,
// or overriden here.
public ovrDistortionMesh? CreateDistortionMesh(ovrEyeType eye,
ovrFovPort fov,
uint distortionCaps)
{
ovrDistortionMesh_Raw rawMesh = new ovrDistortionMesh_Raw();
if (!ovrHmd_CreateDistortionMesh(HmdPtr, eye, fov, distortionCaps, out rawMesh))
{
return null;
}
ovrDistortionMesh mesh = new ovrDistortionMesh(rawMesh);
ovrHmd_DestroyDistortionMesh(ref rawMesh);
return mesh;
}
private static extern void ovrHmd_DestroyDistortionMesh(ref ovrDistortionMesh_Raw meshData);
