protected override unsafe ID3D12RootSignature *CreateRootSignature()
{
using ComPtr <ID3DBlob> signature = null;
using ComPtr <ID3DBlob> error = null;
var featureData = new D3D12_FEATURE_DATA_ROOT_SIGNATURE {
// This is the highest version the sample supports. If CheckFeatureSupport succeeds, the HighestVersion returned will not be greater than this.
HighestVersion = D3D_ROOT_SIGNATURE_VERSION_1_1
};
if (FAILED(D3DDevice->CheckFeatureSupport(D3D12_FEATURE_ROOT_SIGNATURE, &featureData, (uint)sizeof(D3D12_FEATURE))))
{
featureData.HighestVersion = D3D_ROOT_SIGNATURE_VERSION_1_0;
}
const int RangesCount = 1;
var ranges = stackalloc D3D12_DESCRIPTOR_RANGE1[RangesCount];
ranges[0].Init(D3D12_DESCRIPTOR_RANGE_TYPE_SRV, 1, 0, 0, D3D12_DESCRIPTOR_RANGE_FLAG_DATA_STATIC);
const int RootParametersCount = 1;
var rootParameters = stackalloc D3D12_ROOT_PARAMETER1[RootParametersCount];
rootParameters[0].InitAsDescriptorTable(1, ranges, D3D12_SHADER_VISIBILITY_PIXEL);
var sampler = new D3D12_STATIC_SAMPLER_DESC {
Filter = D3D12_FILTER.D3D12_FILTER_MIN_MAG_MIP_POINT,
AddressU = D3D12_TEXTURE_ADDRESS_MODE_BORDER,
AddressV = D3D12_TEXTURE_ADDRESS_MODE_BORDER,
AddressW = D3D12_TEXTURE_ADDRESS_MODE_BORDER,
MipLODBias = 0,
MaxAnisotropy = 0,
ComparisonFunc = D3D12_COMPARISON_FUNC_NEVER,
BorderColor = D3D12_STATIC_BORDER_COLOR_TRANSPARENT_BLACK,
MinLOD = 0.0f,
MaxLOD = D3D12_FLOAT32_MAX,
ShaderRegister = 0,
RegisterSpace = 0,
ShaderVisibility = D3D12_SHADER_VISIBILITY_PIXEL,
};
var rootSignatureDesc = new D3D12_VERSIONED_ROOT_SIGNATURE_DESC();
rootSignatureDesc.Init_1_1(RootParametersCount, rootParameters, 1, &sampler, D3D12_ROOT_SIGNATURE_FLAG_ALLOW_INPUT_ASSEMBLER_INPUT_LAYOUT);
ThrowIfFailed(nameof(D3D12SerializeVersionedRootSignature), D3D12SerializeVersionedRootSignature(
&rootSignatureDesc, featureData.HighestVersion, signature.GetAddressOf(), error.GetAddressOf()));
ID3D12RootSignature *rootSignature;
var iid = IID_ID3D12RootSignature;
ThrowIfFailed(nameof(ID3D12Device.CreateRootSignature), D3DDevice->CreateRootSignature(0, signature.Get()->GetBufferPointer(), signature.Get()->GetBufferSize(), &iid, (void **)&rootSignature));
return(rootSignature);
}
protected override unsafe ID3D12RootSignature *CreateRootSignature()
{
using ComPtr <ID3DBlob> signature = null;
using ComPtr <ID3DBlob> error = null;
var featureData = new D3D12_FEATURE_DATA_ROOT_SIGNATURE {
// This is the highest version the sample supports. If CheckFeatureSupport succeeds, the HighestVersion returned will not be greater than this.
HighestVersion = D3D_ROOT_SIGNATURE_VERSION_1_1
};
if (FAILED(D3DDevice->CheckFeatureSupport(D3D12_FEATURE_ROOT_SIGNATURE, &featureData, (uint)sizeof(D3D12_FEATURE_DATA_ROOT_SIGNATURE))))
{
featureData.HighestVersion = D3D_ROOT_SIGNATURE_VERSION_1_0;
}
const int RangesCount = 1;
var ranges = stackalloc D3D12_DESCRIPTOR_RANGE1[RangesCount];
const int RootParametersCount = 1;
var rootParameters = stackalloc D3D12_ROOT_PARAMETER1[RootParametersCount];
ranges[0].Init(D3D12_DESCRIPTOR_RANGE_TYPE_CBV, 1, 0, 0, D3D12_DESCRIPTOR_RANGE_FLAG_DATA_STATIC);
rootParameters[0].InitAsDescriptorTable(RangesCount, ranges, D3D12_SHADER_VISIBILITY_VERTEX);
// Allow input layout and deny unnecessary access to certain pipeline stages.
var rootSignatureFlags =
D3D12_ROOT_SIGNATURE_FLAG_ALLOW_INPUT_ASSEMBLER_INPUT_LAYOUT |
D3D12_ROOT_SIGNATURE_FLAG_DENY_HULL_SHADER_ROOT_ACCESS |
D3D12_ROOT_SIGNATURE_FLAG_DENY_DOMAIN_SHADER_ROOT_ACCESS |
D3D12_ROOT_SIGNATURE_FLAG_DENY_GEOMETRY_SHADER_ROOT_ACCESS |
D3D12_ROOT_SIGNATURE_FLAG_DENY_PIXEL_SHADER_ROOT_ACCESS;
var rootSignatureDesc = new D3D12_VERSIONED_ROOT_SIGNATURE_DESC();
rootSignatureDesc.Init_1_1(RootParametersCount, rootParameters, 0, null, rootSignatureFlags);
ThrowIfFailed(nameof(D3D12SerializeRootSignature), D3D12SerializeVersionedRootSignature(&rootSignatureDesc, featureData.HighestVersion, signature.GetAddressOf(), error.GetAddressOf()));
ID3D12RootSignature *rootSignature;
var iid = IID_ID3D12RootSignature;
ThrowIfFailed(nameof(ID3D12Device.CreateRootSignature), D3DDevice->CreateRootSignature(0, signature.Get()->GetBufferPointer(), signature.Get()->GetBufferSize(), &iid, (void **)&rootSignature));
return(rootSignature);
}
// Load the sample assets.
private void LoadAssets()
{
Guid iid;
ID3DBlob *signature = null;
ID3DBlob *error = null;
ID3DBlob *vertexShader = null;
ID3DBlob *pixelShader = null;
try
{
// Create a root signature consisting of a descriptor table with a single CBV.
{
var featureData = new D3D12_FEATURE_DATA_ROOT_SIGNATURE {
// This is the highest version the sample supports. If CheckFeatureSupport succeeds, the HighestVersion returned will not be greater than this.
HighestVersion = D3D_ROOT_SIGNATURE_VERSION_1_1
};
if (FAILED(_device->CheckFeatureSupport(D3D12_FEATURE_ROOT_SIGNATURE, &featureData, (uint)sizeof(D3D12_FEATURE_DATA_ROOT_SIGNATURE))))
{
featureData.HighestVersion = D3D_ROOT_SIGNATURE_VERSION_1_0;
}
const int RangesCount = 1;
var ranges = stackalloc D3D12_DESCRIPTOR_RANGE1[RangesCount];
const int RootParametersCount = 1;
var rootParameters = stackalloc D3D12_ROOT_PARAMETER1[RootParametersCount];
ranges[0].Init(D3D12_DESCRIPTOR_RANGE_TYPE_CBV, 1, 0, 0, D3D12_DESCRIPTOR_RANGE_FLAG_DATA_STATIC);
rootParameters[0].InitAsDescriptorTable(RangesCount, ranges, D3D12_SHADER_VISIBILITY_VERTEX);
// Allow input layout and deny unnecessary access to certain pipeline stages.
var rootSignatureFlags =
D3D12_ROOT_SIGNATURE_FLAG_ALLOW_INPUT_ASSEMBLER_INPUT_LAYOUT |
D3D12_ROOT_SIGNATURE_FLAG_DENY_HULL_SHADER_ROOT_ACCESS |
D3D12_ROOT_SIGNATURE_FLAG_DENY_DOMAIN_SHADER_ROOT_ACCESS |
D3D12_ROOT_SIGNATURE_FLAG_DENY_GEOMETRY_SHADER_ROOT_ACCESS |
D3D12_ROOT_SIGNATURE_FLAG_DENY_PIXEL_SHADER_ROOT_ACCESS;
var rootSignatureDesc = new D3D12_VERSIONED_ROOT_SIGNATURE_DESC();
rootSignatureDesc.Init_1_1(RootParametersCount, rootParameters, 0, null, rootSignatureFlags);
ThrowIfFailed(nameof(D3D12SerializeRootSignature), D3D12SerializeVersionedRootSignature(&rootSignatureDesc, featureData.HighestVersion, &signature, &error));
fixed(ID3D12RootSignature **rootSignature = &_rootSignature)
{
iid = IID_ID3D12RootSignature;
ThrowIfFailed(nameof(ID3D12Device.CreateRootSignature), _device->CreateRootSignature(0, signature->GetBufferPointer(), signature->GetBufferSize(), &iid, (void **)rootSignature));
}
}
// Create the pipeline state, which includes compiling and loading shaders.
{
var compileFlags = 0u;
#if DEBUG
// Enable better shader debugging with the graphics debugging tools.
compileFlags |= D3DCOMPILE_DEBUG | D3DCOMPILE_SKIP_OPTIMIZATION;
#endif
fixed(char *fileName = GetAssetFullPath(@"D3D12\Assets\Shaders\HelloConstBuffer.hlsl"))
{
var entryPoint = 0x00006E69614D5356; // VSMain
var target = 0x0000305F355F7376; // vs_5_0
ThrowIfFailed(nameof(D3DCompileFromFile), D3DCompileFromFile((ushort *)fileName, pDefines: null, pInclude: null, (sbyte *)&entryPoint, (sbyte *)&target, compileFlags, Flags2: 0, &vertexShader, ppErrorMsgs: null));
entryPoint = 0x00006E69614D5350; // PSMain
target = 0x0000305F355F7370; // ps_5_0
ThrowIfFailed(nameof(D3DCompileFromFile), D3DCompileFromFile((ushort *)fileName, pDefines: null, pInclude: null, (sbyte *)&entryPoint, (sbyte *)&target, compileFlags, Flags2: 0, &pixelShader, ppErrorMsgs: null));
}
// Define the vertex input layout.
const int InputElementDescsCount = 2;
var semanticName0 = stackalloc ulong[2] {
0x4E4F495449534F50, // POSITION
0x0000000000000000,
};
var semanticName1 = stackalloc ulong[1] {
0x000000524F4C4F43, // COLOR
};
var inputElementDescs = stackalloc D3D12_INPUT_ELEMENT_DESC[InputElementDescsCount] {
new D3D12_INPUT_ELEMENT_DESC {
SemanticName = (sbyte *)semanticName0,
Format = DXGI_FORMAT_R32G32B32_FLOAT,
InputSlotClass = D3D12_INPUT_CLASSIFICATION_PER_VERTEX_DATA,
},
new D3D12_INPUT_ELEMENT_DESC {
SemanticName = (sbyte *)semanticName1,
Format = DXGI_FORMAT_R32G32B32A32_FLOAT,
AlignedByteOffset = 12,
InputSlotClass = D3D12_INPUT_CLASSIFICATION_PER_VERTEX_DATA,
},
};
// Describe and create the graphics pipeline state object (PSO).
var psoDesc = new D3D12_GRAPHICS_PIPELINE_STATE_DESC {
InputLayout = new D3D12_INPUT_LAYOUT_DESC {
pInputElementDescs = inputElementDescs,
NumElements = InputElementDescsCount,
},
pRootSignature = _rootSignature,
VS = new D3D12_SHADER_BYTECODE(vertexShader),
PS = new D3D12_SHADER_BYTECODE(pixelShader),
RasterizerState = D3D12_RASTERIZER_DESC.DEFAULT,
BlendState = D3D12_BLEND_DESC.DEFAULT,
DepthStencilState = D3D12_DEPTH_STENCIL_DESC.DEFAULT,
SampleMask = uint.MaxValue,
PrimitiveTopologyType = D3D12_PRIMITIVE_TOPOLOGY_TYPE_TRIANGLE,
NumRenderTargets = 1,
SampleDesc = new DXGI_SAMPLE_DESC(count: 1, quality: 0),
};
psoDesc.DepthStencilState.DepthEnable = FALSE;
psoDesc.RTVFormats[0] = DXGI_FORMAT_R8G8B8A8_UNORM;
fixed(ID3D12PipelineState **pipelineState = &_pipelineState)
{
iid = IID_ID3D12PipelineState;
ThrowIfFailed(nameof(ID3D12Device.CreateGraphicsPipelineState), _device->CreateGraphicsPipelineState(&psoDesc, &iid, (void **)pipelineState));
}
}
// Create the command list.
fixed(ID3D12GraphicsCommandList **commandList = &_commandList)
{
iid = IID_ID3D12GraphicsCommandList;
ThrowIfFailed(nameof(ID3D12Device.CreateCommandList), _device->CreateCommandList(nodeMask: 0, D3D12_COMMAND_LIST_TYPE_DIRECT, _commandAllocator, _pipelineState, &iid, (void **)commandList));
}
// Command lists are created in the recording state, but there is nothing
// to record yet. The main loop expects it to be closed, so close it now.
ThrowIfFailed(nameof(ID3D12GraphicsCommandList.Close), _commandList->Close());
// Create the vertex buffer.
{
// Define the geometry for a triangle.
const int TriangleVerticesCount = 3;
var triangleVertices = stackalloc Vertex[TriangleVerticesCount] {
new Vertex {
Position = new Vector3(0.0f, 0.25f * AspectRatio, 0.0f),
Color = new Vector4(1.0f, 0.0f, 0.0f, 1.0f)
},
new Vertex {
Position = new Vector3(0.25f, -0.25f * AspectRatio, 0.0f),
Color = new Vector4(0.0f, 1.0f, 0.0f, 1.0f)
},
new Vertex {
Position = new Vector3(-0.25f, -0.25f * AspectRatio, 0.0f),
Color = new Vector4(0.0f, 0.0f, 1.0f, 1.0f)
},
};
var vertexBufferSize = (uint)sizeof(Vertex) * TriangleVerticesCount;
// Note: using upload heaps to transfer static data like vert buffers is not
// recommended. Every time the GPU needs it, the upload heap will be marshalled
// over. Please read up on Default Heap usage. An upload heap is used here for
// code simplicity and because there are very few verts to actually transfer.
fixed(ID3D12Resource **vertexBuffer = &_vertexBuffer)
{
var heapProperties = new D3D12_HEAP_PROPERTIES(D3D12_HEAP_TYPE_UPLOAD);
var bufferDesc = D3D12_RESOURCE_DESC.Buffer(vertexBufferSize);
iid = IID_ID3D12Resource;
ThrowIfFailed(nameof(ID3D12Device.CreateCommittedResource), _device->CreateCommittedResource(
&heapProperties,
D3D12_HEAP_FLAG_NONE,
&bufferDesc,
D3D12_RESOURCE_STATE_GENERIC_READ,
pOptimizedClearValue: null,
&iid,
(void **)vertexBuffer
));
}
// Copy the triangle data to the vertex buffer.
var readRange = new D3D12_RANGE();
byte *pVertexDataBegin;
ThrowIfFailed(nameof(ID3D12Resource.Map), _vertexBuffer->Map(Subresource: 0, &readRange, (void **)&pVertexDataBegin));
Unsafe.CopyBlock(pVertexDataBegin, triangleVertices, vertexBufferSize);
_vertexBuffer->Unmap(0, null);
// Initialize the vertex buffer view.
_vertexBufferView.BufferLocation = _vertexBuffer->GetGPUVirtualAddress();
_vertexBufferView.StrideInBytes = (uint)sizeof(Vertex);
_vertexBufferView.SizeInBytes = vertexBufferSize;
}
// Create the constant buffer.
{
fixed(ID3D12Resource **pConstantBuffer = &_constantBuffer)
{
var heapProperties = new D3D12_HEAP_PROPERTIES(D3D12_HEAP_TYPE_UPLOAD);
var bufferDesc = D3D12_RESOURCE_DESC.Buffer(1024 * 64);
iid = IID_ID3D12Resource;
ThrowIfFailed(nameof(ID3D12Device.CreateCommittedResource), _device->CreateCommittedResource(
&heapProperties,
D3D12_HEAP_FLAG_NONE,
&bufferDesc,
D3D12_RESOURCE_STATE_GENERIC_READ,
pOptimizedClearValue: null,
&iid,
(void **)pConstantBuffer));
}
// Describe and create a constant buffer view.
var cbvDesc = new D3D12_CONSTANT_BUFFER_VIEW_DESC {
BufferLocation = _constantBuffer->GetGPUVirtualAddress(),
SizeInBytes = (uint)((sizeof(SceneConstantBuffer) + 255) & ~255) // CB size is required to be 256-byte aligned.
};
_device->CreateConstantBufferView(&cbvDesc, _cbvHeap->GetCPUDescriptorHandleForHeapStart());
// Map and initialize the constant buffer. We don't unmap this until the
// app closes. Keeping things mapped for the lifetime of the resource is okay.
var readRange = new D3D12_RANGE(); // We do not intend to read from this resource on the CPU.
fixed(byte **ppCbvDataBegin = &_pCbvDataBegin)
{
ThrowIfFailed(nameof(ID3D12Resource.Map), _constantBuffer->Map(Subresource: 0, &readRange, (void **)ppCbvDataBegin));
Unsafe.CopyBlock(ref _pCbvDataBegin[0], ref Unsafe.As <SceneConstantBuffer, byte>(ref _constantBufferData), (uint)sizeof(SceneConstantBuffer));
}
// Create synchronization objects and wait until assets have been uploaded to the GPU.
{
fixed(ID3D12Fence **fence = &_fence)
{
iid = IID_ID3D12Fence;
ThrowIfFailed(nameof(ID3D12Device.CreateFence), _device->CreateFence(0, D3D12_FENCE_FLAG_NONE, &iid, (void **)fence));
_fenceValue = 1;
}
// Create an event handle to use for frame synchronization.
_fenceEvent = CreateEventW(lpEventAttributes: null, bManualReset: FALSE, bInitialState: FALSE, lpName: null);
if (_fenceEvent == null)
{
var hr = Marshal.GetHRForLastWin32Error();
Marshal.ThrowExceptionForHR(hr);
}
// Wait for the command list to execute; we are reusing the same command
// list in our main loop but for now, we just want to wait for setup to
// complete before continuing.
WaitForPreviousFrame();
}
}
}
finally
{
if (signature != null)
{
signature->Release();
}
if (error != null)
{
error->Release();
}
if (vertexShader != null)
{
vertexShader->Release();
}
if (pixelShader != null)
{
pixelShader->Release();
}
}
}
// Load the sample assets.
private void LoadAssets()
{
Guid iid;
ID3DBlob *signature = null;
ID3DBlob *error = null;
ID3DBlob *vertexShader = null;
ID3DBlob *pixelShader = null;
try
{
// Create the root signature.
{
var featureData = new D3D12_FEATURE_DATA_ROOT_SIGNATURE {
// This is the highest version the sample supports. If CheckFeatureSupport succeeds, the HighestVersion returned will not be greater than this.
HighestVersion = D3D_ROOT_SIGNATURE_VERSION_1_1
};
if (FAILED(_device->CheckFeatureSupport(D3D12_FEATURE_ROOT_SIGNATURE, &featureData, (uint)sizeof(D3D12_FEATURE))))
{
featureData.HighestVersion = D3D_ROOT_SIGNATURE_VERSION_1_0;
}
const int RangesCount = 1;
var ranges = stackalloc D3D12_DESCRIPTOR_RANGE1[RangesCount];
ranges[0].Init(D3D12_DESCRIPTOR_RANGE_TYPE_SRV, 1, 0, 0, D3D12_DESCRIPTOR_RANGE_FLAG_DATA_STATIC);
const int RootParametersCount = 1;
var rootParameters = stackalloc D3D12_ROOT_PARAMETER1[RootParametersCount];
rootParameters[0].InitAsDescriptorTable(1, ranges, D3D12_SHADER_VISIBILITY_PIXEL);
var sampler = new D3D12_STATIC_SAMPLER_DESC {
Filter = D3D12_FILTER.D3D12_FILTER_MIN_MAG_MIP_POINT,
AddressU = D3D12_TEXTURE_ADDRESS_MODE_BORDER,
AddressV = D3D12_TEXTURE_ADDRESS_MODE_BORDER,
AddressW = D3D12_TEXTURE_ADDRESS_MODE_BORDER,
MipLODBias = 0,
MaxAnisotropy = 0,
ComparisonFunc = D3D12_COMPARISON_FUNC_NEVER,
BorderColor = D3D12_STATIC_BORDER_COLOR_TRANSPARENT_BLACK,
MinLOD = 0.0f,
MaxLOD = D3D12_FLOAT32_MAX,
ShaderRegister = 0,
RegisterSpace = 0,
ShaderVisibility = D3D12_SHADER_VISIBILITY_PIXEL,
};
var rootSignatureDesc = new D3D12_VERSIONED_ROOT_SIGNATURE_DESC();
rootSignatureDesc.Init_1_1(RootParametersCount, rootParameters, 1, &sampler, D3D12_ROOT_SIGNATURE_FLAG_ALLOW_INPUT_ASSEMBLER_INPUT_LAYOUT);
ThrowIfFailed(nameof(D3D12SerializeVersionedRootSignature), D3D12SerializeVersionedRootSignature(
&rootSignatureDesc, featureData.HighestVersion, &signature, &error));
fixed(ID3D12RootSignature **rootSignature = &_rootSignature)
{
iid = IID_ID3D12RootSignature;
ThrowIfFailed(nameof(ID3D12Device.CreateRootSignature), _device->CreateRootSignature(0, signature->GetBufferPointer(), signature->GetBufferSize(), &iid, (void **)rootSignature));
}
}
// Create the pipeline state, which includes compiling and loading shaders.
{
var compileFlags = 0u;
#if DEBUG
// Enable better shader debugging with the graphics debugging tools.
compileFlags |= D3DCOMPILE_DEBUG | D3DCOMPILE_SKIP_OPTIMIZATION;
#endif
fixed(char *fileName = GetAssetFullPath(@"D3D12\Assets\Shaders\HelloTexture.hlsl"))
{
var entryPoint = 0x00006E69614D5356; // VSMain
var target = 0x0000305F355F7376; // vs_5_0
ThrowIfFailed(nameof(D3DCompileFromFile), D3DCompileFromFile((ushort *)fileName, pDefines: null, pInclude: null, (sbyte *)&entryPoint, (sbyte *)&target, compileFlags, Flags2: 0, &vertexShader, ppErrorMsgs: null));
entryPoint = 0x00006E69614D5350; // PSMain
target = 0x0000305F355F7370; // ps_5_0
ThrowIfFailed(nameof(D3DCompileFromFile), D3DCompileFromFile((ushort *)fileName, pDefines: null, pInclude: null, (sbyte *)&entryPoint, (sbyte *)&target, compileFlags, Flags2: 0, &pixelShader, ppErrorMsgs: null));
}
// Define the vertex input layout.
const int InputElementDescsCount = 2;
var semanticName0 = stackalloc ulong[2] {
0x4E4F495449534F50, // POSITION
0x0000000000000000,
};
var semanticName1 = stackalloc ulong[2] {
0x44524F4F43584554, // TEXCOORD
0x0000000000000000,
};
var inputElementDescs = stackalloc D3D12_INPUT_ELEMENT_DESC[InputElementDescsCount] {
new D3D12_INPUT_ELEMENT_DESC {
SemanticName = (sbyte *)semanticName0,
Format = DXGI_FORMAT_R32G32B32_FLOAT,
InputSlotClass = D3D12_INPUT_CLASSIFICATION_PER_VERTEX_DATA,
},
new D3D12_INPUT_ELEMENT_DESC {
SemanticName = (sbyte *)semanticName1,
Format = DXGI_FORMAT_R32G32_FLOAT,
AlignedByteOffset = 12,
InputSlotClass = D3D12_INPUT_CLASSIFICATION_PER_VERTEX_DATA,
},
};
// Describe and create the graphics pipeline state object (PSO).
var psoDesc = new D3D12_GRAPHICS_PIPELINE_STATE_DESC {
InputLayout = new D3D12_INPUT_LAYOUT_DESC {
pInputElementDescs = inputElementDescs,
NumElements = InputElementDescsCount,
},
pRootSignature = _rootSignature,
VS = new D3D12_SHADER_BYTECODE(vertexShader),
PS = new D3D12_SHADER_BYTECODE(pixelShader),
RasterizerState = D3D12_RASTERIZER_DESC.DEFAULT,
BlendState = D3D12_BLEND_DESC.DEFAULT,
DepthStencilState = new D3D12_DEPTH_STENCIL_DESC {
DepthEnable = FALSE,
StencilEnable = FALSE,
},
SampleMask = uint.MaxValue,
PrimitiveTopologyType = D3D12_PRIMITIVE_TOPOLOGY_TYPE_TRIANGLE,
NumRenderTargets = 1,
SampleDesc = new DXGI_SAMPLE_DESC(count: 1, quality: 0),
};
psoDesc.RTVFormats[0] = DXGI_FORMAT_R8G8B8A8_UNORM;
fixed(ID3D12PipelineState **pipelineState = &_pipelineState)
{
iid = IID_ID3D12PipelineState;
ThrowIfFailed(nameof(ID3D12Device.CreateGraphicsPipelineState), _device->CreateGraphicsPipelineState(&psoDesc, &iid, (void **)pipelineState));
}
}
// Create the command list.
fixed(ID3D12GraphicsCommandList **commandList = &_commandList)
{
iid = IID_ID3D12GraphicsCommandList;
ThrowIfFailed(nameof(ID3D12Device.CreateCommandList), _device->CreateCommandList(nodeMask: 0, D3D12_COMMAND_LIST_TYPE_DIRECT, _commandAllocator, _pipelineState, &iid, (void **)commandList));
}
// Create the vertex buffer.
{
// Define the geometry for a triangle.
const int TriangleVerticesCount = 3;
var triangleVertices = stackalloc Vertex[TriangleVerticesCount] {
new Vertex {
Position = new Vector3(0.0f, 0.25f * AspectRatio, 0.0f),
UV = new Vector2(0.5f, 0.0f)
},
new Vertex {
Position = new Vector3(0.25f, -0.25f * AspectRatio, 0.0f),
UV = new Vector2(1.0f, 1.0f)
},
new Vertex {
Position = new Vector3(-0.25f, -0.25f * AspectRatio, 0.0f),
UV = new Vector2(0.0f, 1.0f)
},
};
var vertexBufferSize = (uint)sizeof(Vertex) * TriangleVerticesCount;
// Note: using upload heaps to transfer static data like vert buffers is not
// recommended. Every time the GPU needs it, the upload heap will be marshalled
// over. Please read up on Default Heap usage. An upload heap is used here for
// code simplicity and because there are very few verts to actually transfer.
fixed(ID3D12Resource **vertexBuffer = &_vertexBuffer)
{
var heapProperties = new D3D12_HEAP_PROPERTIES(D3D12_HEAP_TYPE_UPLOAD);
var bufferDesc = D3D12_RESOURCE_DESC.Buffer(vertexBufferSize);
iid = IID_ID3D12Resource;
ThrowIfFailed(nameof(ID3D12Device.CreateCommittedResource), _device->CreateCommittedResource(
&heapProperties,
D3D12_HEAP_FLAG_NONE,
&bufferDesc,
D3D12_RESOURCE_STATE_GENERIC_READ,
pOptimizedClearValue: null,
&iid,
(void **)vertexBuffer
));
}
// Copy the triangle data to the vertex buffer.
var readRange = new D3D12_RANGE();
byte *pVertexDataBegin;
ThrowIfFailed(nameof(ID3D12Resource.Map), _vertexBuffer->Map(Subresource: 0, &readRange, (void **)&pVertexDataBegin));
Unsafe.CopyBlock(pVertexDataBegin, triangleVertices, vertexBufferSize);
_vertexBuffer->Unmap(0, null);
// Initialize the vertex buffer view.
_vertexBufferView.BufferLocation = _vertexBuffer->GetGPUVirtualAddress();
_vertexBufferView.StrideInBytes = (uint)sizeof(Vertex);
_vertexBufferView.SizeInBytes = vertexBufferSize;
}
// Note: textureUploadHeap needs to stay in scope until
// the command list that references it has finished executing on the GPU.
// We will flush the GPU at the end of this method to ensure the resource is not
// prematurely destroyed.
ID3D12Resource *textureUploadHeap;
// Create the texture.
{
// Describe and create a Texture2D.
var textureDesc = new D3D12_RESOURCE_DESC {
MipLevels = 1,
Format = DXGI_FORMAT_R8G8B8A8_UNORM,
Width = TextureWidth,
Height = TextureHeight,
Flags = D3D12_RESOURCE_FLAG_NONE,
DepthOrArraySize = 1,
SampleDesc = new DXGI_SAMPLE_DESC {
Count = 1,
Quality = 0,
},
Dimension = D3D12_RESOURCE_DIMENSION_TEXTURE2D,
};
fixed(ID3D12Resource **pTexture = &_texture)
{
var heapProperties = new D3D12_HEAP_PROPERTIES(D3D12_HEAP_TYPE_DEFAULT);
iid = IID_ID3D12Resource;
ThrowIfFailed(nameof(ID3D12Device.CreateCommittedResource), _device->CreateCommittedResource(
&heapProperties,
D3D12_HEAP_FLAG_NONE,
&textureDesc,
D3D12_RESOURCE_STATE_COPY_DEST,
pOptimizedClearValue: null,
&iid,
(void **)pTexture
));
var uploadBufferSize = GetRequiredIntermediateSize(_texture, 0, 1);
// Create the GPU upload buffer.
heapProperties = new D3D12_HEAP_PROPERTIES(D3D12_HEAP_TYPE_UPLOAD);
var bufferDesc = D3D12_RESOURCE_DESC.Buffer(uploadBufferSize);
ThrowIfFailed(nameof(ID3D12Device.CreateCommittedResource), _device->CreateCommittedResource(
&heapProperties,
D3D12_HEAP_FLAG_NONE,
&bufferDesc,
D3D12_RESOURCE_STATE_GENERIC_READ,
pOptimizedClearValue: null,
&iid,
(void **)&textureUploadHeap
));
}
// Copy data to the intermediate upload heap and then schedule a copy
// from the upload heap to the Texture2D.
var texture = GenerateTextureData();
var rowPitch = TextureWidth * TexturePixelSize;
var slicePitch = rowPitch * TextureHeight;
D3D12_SUBRESOURCE_DATA textureData;
fixed(byte *pTexture = &texture[0])
{
textureData = new D3D12_SUBRESOURCE_DATA {
pData = (void *)pTexture,
RowPitch = (nint)rowPitch,
SlicePitch = (nint)slicePitch,
};
}
UpdateSubresources(_commandList, _texture, textureUploadHeap, 0, 0, 1, &textureData);
var barrier = D3D12_RESOURCE_BARRIER.InitTransition(_texture, D3D12_RESOURCE_STATE_COPY_DEST, D3D12_RESOURCE_STATE_PIXEL_SHADER_RESOURCE);
_commandList->ResourceBarrier(1, &barrier);
// Describe and create a SRV for the texture.
var srvDesc = new D3D12_SHADER_RESOURCE_VIEW_DESC {
Shader4ComponentMapping = D3D12_DEFAULT_SHADER_4_COMPONENT_MAPPING,
Format = textureDesc.Format,
ViewDimension = D3D12_SRV_DIMENSION_TEXTURE2D,
};
srvDesc.Anonymous.Texture2D.MipLevels = 1;
_device->CreateShaderResourceView(_texture, &srvDesc, _srvHeap->GetCPUDescriptorHandleForHeapStart());
}
// Close the command list and execute it to begin the initial GPU setup.
ThrowIfFailed(nameof(ID3D12GraphicsCommandList.Close), _commandList->Close());
const int CommandListsCount = 1;
var ppCommandLists = stackalloc ID3D12CommandList *[CommandListsCount] {
(ID3D12CommandList *)_commandList,
};
_commandQueue->ExecuteCommandLists(CommandListsCount, ppCommandLists);
// Create synchronization objects and wait until assets have been uploaded to the GPU.
{
fixed(ID3D12Fence **fence = &_fence)
{
iid = IID_ID3D12Fence;
ThrowIfFailed(nameof(ID3D12Device.CreateFence), _device->CreateFence(0, D3D12_FENCE_FLAG_NONE, &iid, (void **)fence));
_fenceValue = 1;
}
// Create an event handle to use for frame synchronization.
_fenceEvent = CreateEventW(lpEventAttributes: null, bManualReset: FALSE, bInitialState: FALSE, lpName: null);
if (_fenceEvent == null)
{
var hr = Marshal.GetHRForLastWin32Error();
Marshal.ThrowExceptionForHR(hr);
}
// Wait for the command list to execute; we are reusing the same command
// list in our main loop but for now, we just want to wait for setup to
// complete before continuing.
WaitForPreviousFrame();
}
}
finally
{
if (signature != null)
{
signature->Release();
}
if (error != null)
{
error->Release();
}
if (vertexShader != null)
{
vertexShader->Release();
}
if (pixelShader != null)
{
pixelShader->Release();
}
}
}