public static MTLVertexDescriptor FromModelIO(MDLVertexDescriptor descriptor)
{
if (descriptor == null)
{
throw new ArgumentException("descriptor");
}
return(Runtime.GetNSObject <MTLVertexDescriptor> (MTKMetalVertexDescriptorFromModelIO(descriptor.Handle)));
}
public static MTLVertexDescriptor FromModelIO(MDLVertexDescriptor descriptor, out NSError error)
{
if (descriptor == null)
{
throw new ArgumentException("descriptor");
}
IntPtr err;
var vd = Runtime.GetNSObject <MTLVertexDescriptor> (MTKMetalVertexDescriptorFromModelIOWithError(descriptor.Handle, out err));
error = Runtime.GetNSObject <NSError> (err);
return(vd);
}
void LoadAssets()
{
// Load the fragment program into the library.
IMTLFunction fragmentProgram = defaultLibrary.CreateFunction("fragmentLight");
// Load the vertex program into the library.
IMTLFunction vertexProgram = defaultLibrary.CreateFunction("vertexLight");
/*
* Create a vertex descriptor for our Metal pipeline. Specifies the layout
* of vertices the pipeline should expect.
*/
var mtlVertexDescriptor = new MTLVertexDescriptor();
// Positions.
mtlVertexDescriptor.Attributes [(int)VertexAttributes.Position].Format = MTLVertexFormat.Float3;
mtlVertexDescriptor.Attributes [(int)VertexAttributes.Position].Offset = 0;
mtlVertexDescriptor.Attributes [(int)VertexAttributes.Position].BufferIndex = (nuint)(int)BufferIndex.MeshVertexBuffer;
// Normals.
mtlVertexDescriptor.Attributes[(int)VertexAttributes.Normal].Format = MTLVertexFormat.Float3;
mtlVertexDescriptor.Attributes[(int)VertexAttributes.Normal].Offset = 12;
mtlVertexDescriptor.Attributes[(int)VertexAttributes.Normal].BufferIndex = (nuint)(int)BufferIndex.MeshVertexBuffer;
// Texture coordinates.
mtlVertexDescriptor.Attributes[(int)VertexAttributes.Texcoord].Format = MTLVertexFormat.Half2;
mtlVertexDescriptor.Attributes[(int)VertexAttributes.Texcoord].Offset = 24;
mtlVertexDescriptor.Attributes[(int)VertexAttributes.Texcoord].BufferIndex = (nuint)(int)BufferIndex.MeshVertexBuffer;
// Single interleaved buffer.
mtlVertexDescriptor.Layouts[(int)BufferIndex.MeshVertexBuffer].Stride = 28;
mtlVertexDescriptor.Layouts[(int)BufferIndex.MeshVertexBuffer].StepRate = 1;
mtlVertexDescriptor.Layouts[(int)BufferIndex.MeshVertexBuffer].StepFunction = MTLVertexStepFunction.PerVertex;
// Create a reusable pipeline state
var pipelineStateDescriptor = new MTLRenderPipelineDescriptor {
Label = "MyPipeline",
SampleCount = view.SampleCount,
VertexFunction = vertexProgram,
FragmentFunction = fragmentProgram,
VertexDescriptor = mtlVertexDescriptor
};
pipelineStateDescriptor.ColorAttachments [0].PixelFormat = view.ColorPixelFormat;
pipelineStateDescriptor.DepthAttachmentPixelFormat = view.DepthStencilPixelFormat;
pipelineStateDescriptor.StencilAttachmentPixelFormat = view.DepthStencilPixelFormat;
NSError error;
pipelineState = device.CreateRenderPipelineState(pipelineStateDescriptor, out error);
if (pipelineState == null)
{
Console.WriteLine("Failed to created pipeline state, error {0}", error.LocalizedDescription);
}
var depthStateDesc = new MTLDepthStencilDescriptor {
DepthCompareFunction = MTLCompareFunction.Less,
DepthWriteEnabled = true,
};
depthState = device.CreateDepthStencilState(depthStateDesc);
/*
* From our Metal vertex descriptor, create a Model I/O vertex descriptor we'll
* load our asset with. This specifies the layout of vertices Model I/O should
* format loaded meshes with.
*/
var mdlVertexDescriptor = MDLVertexDescriptor.FromMetal(mtlVertexDescriptor);
mdlVertexDescriptor.Attributes.GetItem <MDLVertexAttribute> ((int)VertexAttributes.Position).Name = MDLVertexAttributes.Position;
mdlVertexDescriptor.Attributes.GetItem <MDLVertexAttribute> ((int)VertexAttributes.Normal).Name = MDLVertexAttributes.Normal;
mdlVertexDescriptor.Attributes.GetItem <MDLVertexAttribute> ((int)VertexAttributes.Texcoord).Name = MDLVertexAttributes.TextureCoordinate;
var bufferAllocator = new MTKMeshBufferAllocator(device);
NSUrl assetUrl = NSBundle.MainBundle.GetUrlForResource("Data/Assets/realship/realship.obj", string.Empty);
if (assetUrl == null)
{
Console.WriteLine("Could not find asset.");
}
/*
* Load Model I/O Asset with mdlVertexDescriptor, specifying vertex layout and
* bufferAllocator enabling ModelIO to load vertex and index buffers directory
* into Metal GPU memory.
*/
var asset = new MDLAsset(assetUrl, mdlVertexDescriptor, bufferAllocator);
// Create MetalKit meshes.
MDLMesh[] mdlMeshes;
NSError mtkError;
var mtkMeshes = MTKMesh.FromAsset(asset, device, out mdlMeshes, out mtkError);
if (mtkMeshes == null)
{
Console.WriteLine("Failed to create mesh, error {0}", error.LocalizedDescription);
return;
}
// Create our array of App-Specific mesh wrapper objects.
meshes = new List <MetalKitEssentialsMesh> ();
for (int i = 0; i < mtkMeshes.Length; i++)
{
var mtkMesh = mtkMeshes [i];
var mdlMesh = mdlMeshes [(nuint)i];
var mesh = new MetalKitEssentialsMesh(mtkMesh, mdlMesh, device);
meshes.Add(mesh);
}
for (int i = 0; i < maxInflightBuffers; i++)
{
frameUniformBuffers [i] = device.CreateBuffer((nuint)Marshal.SizeOf <FrameUniforms> (), MTLResourceOptions.CpuCacheModeDefault);
}
}