public static unsafe bool TryGetMeshRaw(
Renderable renderable,
void *vertices, ulong verticesByteSize,
int *indices, ulong indicesByteSize,
[MaybeNullWhen(false)] out Type vertexType,
out ulong verticesByteSizeActual,
out uint indicesByteSizeActual)
{
ArgumentNullException.ThrowIfNull(renderable);
if (renderable.TryGetScreen(out var screen) == false)
{
goto FAILURE;
}
if (Engine.CurrentContext != screen)
{
goto FAILURE;
}
if (renderable.IsLoaded == false)
{
goto FAILURE;
}
vertexType = renderable.VertexType;
Debug.Assert(vertexType != null);
if (VertexMarshalHelper.TryGetVertexTypeData(vertexType, out var vertexTypeData) == false)
{
goto FAILURE;
}
var vertexSize = (ulong)vertexTypeData.VertexSize;
Debug.Assert(vertexType != null);
var vbo = renderable.VBO;
var ibo = renderable.IBO;
var verticesCount = vbo.Length;
var indicesCount = ibo.Length;
verticesByteSizeActual = verticesCount * vertexSize;
indicesByteSizeActual = indicesCount * sizeof(int);
if (verticesByteSize < verticesByteSizeActual)
{
goto FAILURE;
}
if (indicesByteSize < indicesByteSizeActual)
{
goto FAILURE;
}
try {
VBO.Bind(vbo);
var vSource = (void *)VBO.MapBufferReadOnly();
Buffer.MemoryCopy(vSource, vertices, verticesByteSize, verticesByteSizeActual);
}
finally {
VBO.UnmapBuffer();
VBO.Unbind();
}
try {
IBO.Bind(ibo);
var iSource = (void *)IBO.MapBufferReadOnly();
Buffer.MemoryCopy(iSource, indices, indicesByteSize, indicesByteSizeActual);
}
finally {
IBO.UnmapBuffer();
IBO.Unbind();
}
return(true);
FAILURE:
vertexType = null;
verticesByteSizeActual = 0;
indicesByteSizeActual = 0;
return(false);
}
public static unsafe bool TryGetMesh(Renderable renderable, [MaybeNullWhen(false)] out Mesh mesh)
{
ArgumentNullException.ThrowIfNull(renderable);
if (renderable.TryGetScreen(out var screen) == false)
{
goto FAILURE;
}
if (Engine.CurrentContext != screen)
{
goto FAILURE;
}
if (renderable.IsLoaded == false)
{
goto FAILURE;
}
const uint IndexSize = sizeof(int);
var vertexType = renderable.VertexType;
Debug.Assert(vertexType != null);
if (VertexMarshalHelper.TryGetVertexTypeData(vertexType, out var vertexTypeData) == false)
{
goto FAILURE;
}
var vertexSize = (ulong)vertexTypeData.VertexSize;
Debug.Assert(vertexType != null);
var vbo = renderable.VBO;
var ibo = renderable.IBO;
var verticesCount = vbo.Length;
var indicesCount = ibo.Length;
var verticesByteSize = verticesCount * vertexSize;
var indicesByteSize = indicesCount * IndexSize;
var bufLen = verticesByteSize + indicesByteSize;
var buf = UniquePtr.Malloc(checked ((nuint)bufLen));
var vDest = (void *)buf.Ptr;
var iDest = buf.GetPtr <byte>() + verticesByteSize;
try {
try {
VBO.Bind(vbo);
var vSource = (void *)VBO.MapBufferReadOnly();
Buffer.MemoryCopy(vSource, vDest, bufLen, verticesByteSize);
}
finally {
VBO.UnmapBuffer();
VBO.Unbind();
}
try {
IBO.Bind(ibo);
var iSource = (void *)IBO.MapBufferReadOnly();
Buffer.MemoryCopy(iSource, iDest, bufLen, indicesByteSize);
}
finally {
IBO.UnmapBuffer();
IBO.Unbind();
}
mesh = Mesh.Create(vertexTypeData, IndexSize, vDest, verticesByteSize, iDest, indicesByteSize, ref buf, static buf => buf.Dispose());
return(true);
}
finally {
buf.Dispose();
}
FAILURE:
mesh = null;
return(false);
}