/// <summary>
/// Map memory, then copies data then unmaps device memory
/// </summary>
/// <returns>The data.</returns>
/// <param name="device">Device.</param>
/// <param name="sizeInBytes">Size in bytes.</param>
/// <param name="data">Data.</param>
/// <param name="startIndex">Start index.</param>
/// <param name="elementCount">Element count.</param>
/// <typeparam name="TData">The 1st type parameter.</typeparam>
public Result SetData <TData>(uint sizeInBytes, TData[] data, int startIndex, int elementCount)
where TData : struct
{
if (data == null)
{
return(Result.SUCCESS);
}
int stride = Marshal.SizeOf(typeof(TData));
if (sizeInBytes < (stride * elementCount))
{
throw new ArgumentOutOfRangeException("sizeInBytes");
}
IntPtr dest;
var result = mDeviceMemory.MapMemory(mDevice, 0, sizeInBytes, 0, out dest);
Debug.Assert(result == Result.SUCCESS);
// Copy the struct to unmanaged memory.
int offset = 0;
for (int i = 0; i < elementCount; ++i)
{
IntPtr localDest = IntPtr.Add(dest, offset);
Marshal.StructureToPtr(data[i + startIndex], localDest, false);
offset += stride;
}
mDeviceMemory.UnmapMemory(mDevice);
return(Result.SUCCESS);
}
void InitializeMesh()
{
// Generate meshes
// Mg : Buffer
var indicesInBytes = (ulong)(sizeof(uint) * indicesVboData.Length);
var vertexStride = Marshal.SizeOf(typeof(Vector3));
var verticesInBytes = (ulong)(vertexStride * positionVboData.Length);
var bufferSize = indicesInBytes + verticesInBytes;
var bufferCreateInfo = new MgBufferCreateInfo
{
Usage = MgBufferUsageFlagBits.INDEX_BUFFER_BIT | MgBufferUsageFlagBits.VERTEX_BUFFER_BIT,
Size = bufferSize,
};
var device = mConfiguration.Device;
var result = device.CreateBuffer(bufferCreateInfo, null, out mBuffer);
Debug.Assert(result == Result.SUCCESS);
MgMemoryRequirements memReqs;
device.GetBufferMemoryRequirements(mBuffer, out memReqs);
const MgMemoryPropertyFlagBits memoryPropertyFlags = MgMemoryPropertyFlagBits.HOST_COHERENT_BIT;
uint memoryTypeIndex;
mConfiguration.Partition.GetMemoryType(
memReqs.MemoryTypeBits, memoryPropertyFlags, out memoryTypeIndex);
var memAlloc = new MgMemoryAllocateInfo
{
MemoryTypeIndex = memoryTypeIndex,
AllocationSize = memReqs.Size,
};
result = device.AllocateMemory(memAlloc, null, out mDeviceMemory);
Debug.Assert(result == Result.SUCCESS);
mBuffer.BindBufferMemory(device, mDeviceMemory, 0);
// COPY INDEX DATA
IntPtr dest;
result = mDeviceMemory.MapMemory(device, 0, bufferSize, 0, out dest);
Debug.Assert(result == Result.SUCCESS);
var tempIndices = new byte[indicesInBytes];
Buffer.BlockCopy(indicesVboData, 0, tempIndices, 0, (int)indicesInBytes);
Marshal.Copy(tempIndices, 0, dest, (int)indicesInBytes);
// COPY VERTEX DATA
var vertexOffset = indicesInBytes;
// Copy the struct to unmanaged memory.
int offset = (int)vertexOffset;
for (int i = 0; i < positionVboData.Length; ++i)
{
IntPtr localDest = IntPtr.Add(dest, offset);
Marshal.StructureToPtr(positionVboData[i], localDest, false);
offset += vertexStride;
}
mDeviceMemory.UnmapMemory(device);
mIndices = new BufferInfo
{
Buffer = mBuffer,
DeviceMemory = mDeviceMemory,
Offset = 0,
Length = indicesInBytes,
};
mVertices = new BufferInfo
{
Buffer = mBuffer,
DeviceMemory = mDeviceMemory,
Offset = indicesInBytes,
Length = verticesInBytes,
};
}