Feature/dx12 (#469)

* Fix signed/unsigned comparison warning.

* Split out d3d functions that will work across dx11 and 12.

* Improve slang-test/README.md around command line options.

* Make Guid comparison honor alignment for comparisons, such that mechanism work on architectures that can only do aligned accesses.

* Initial setup of D3D12 Renderer, with presentFrame and clearFrame.

* More support for D3D12

* Added FreeList
* Added D3D12CircularResourceHeap
* First attempt at createBuffer

* First pass at map/unmap.

* First pass binding vertex/constant buffers, and setting up InputLayout. Note that memory is not kept in scope on binding yet.

* First pass of D3DDescriptorHeap

* Small tidy up in render-d3d11. Added D3DDescriptorHeap to project.

* First pass at D3D12 bind state.

* Fix typos in D3D12Resource

* Tidy up Dx11 render binding a little to match more with Dx12 style.

* First pass at Dx12 BindingState

* Handling of the command list d3d12. Support for submitGpuWork and waitForGpu.

* First attempt at Dx12 capture of backbuffer to file.

* First attempt at D3D12 binding for graphics.

* D3D12 setup viewport etc - does now render triangle in render0.hlsl.

* First pass at support for compute on D3D12Renderer

* Use spaces over tabs in D3DUtil

* Tabs to spaces in D3D12DescriptorHeap

* Convert tab->spaces on render-d3d12.cpp

1 files changed, 47 insertions, 0 deletions

diff --git a/tools/render-test/descriptor-heap-d3d12.cpp b/tools/render-test/descriptor-heap-d3d12.cpp
new file mode 100644
index 000000000..5bd238528
--- /dev/null
+++ b/tools/render-test/descriptor-heap-d3d12.cpp
@@ -0,0 +1,47 @@
+
+#include "descriptor-heap-d3d12.h"
+
+namespace renderer_test {
+using namespace Slang;
+
+D3D12DescriptorHeap::D3D12DescriptorHeap():
+    m_totalSize(0),
+    m_currentIndex(0),
+    m_descriptorSize(0)
+{
+}
+
+Result D3D12DescriptorHeap::init(ID3D12Device* device, int size, D3D12_DESCRIPTOR_HEAP_TYPE type, D3D12_DESCRIPTOR_HEAP_FLAGS flags)
+{
+    D3D12_DESCRIPTOR_HEAP_DESC srvHeapDesc = {};
+    srvHeapDesc.NumDescriptors = size;
+    srvHeapDesc.Flags = flags;
+    srvHeapDesc.Type = type;
+    SLANG_RETURN_ON_FAIL(device->CreateDescriptorHeap(&srvHeapDesc, IID_PPV_ARGS(m_heap.writeRef())));
+
+    m_descriptorSize = device->GetDescriptorHandleIncrementSize(type);
+    m_totalSize = size;
+
+    return SLANG_OK;
+}
+
+Result D3D12DescriptorHeap::init(ID3D12Device* device, const D3D12_CPU_DESCRIPTOR_HANDLE* handles, int numHandles, D3D12_DESCRIPTOR_HEAP_TYPE type, D3D12_DESCRIPTOR_HEAP_FLAGS flags)
+{
+    SLANG_RETURN_ON_FAIL(init(device, numHandles, type, flags));
+    D3D12_CPU_DESCRIPTOR_HANDLE dst = m_heap->GetCPUDescriptorHandleForHeapStart();
+
+    // Copy them all 
+    for (int i = 0; i < numHandles; i++, dst.ptr += m_descriptorSize)
+    {
+        D3D12_CPU_DESCRIPTOR_HANDLE src = handles[i];
+        if (src.ptr != 0)
+        {
+            device->CopyDescriptorsSimple(1, dst, src, type);
+        }
+    }
+
+    return SLANG_OK;
+}
+
+} // namespace renderer_test
+