Refactor render-test to make cross platform (#1053)

* First pass of render-test refactor.

* Make window construction a function that can choose an implementation.

* Remove OpenGL as currently has windows dependency.

* Disable Vulkan as Renderer impl has dependency on windows.

* Pass Window in as parameter of 'update'.

* Add win-window.cpp as was missing.

* Fix warning on windows about signs during comparison.

1 files changed, 47 insertions, 0 deletions

diff --git a/tools/gfx/d3d12/descriptor-heap-d3d12.cpp b/tools/gfx/d3d12/descriptor-heap-d3d12.cpp
new file mode 100644
index 000000000..382fc3219
--- /dev/null
+++ b/tools/gfx/d3d12/descriptor-heap-d3d12.cpp
@@ -0,0 +1,47 @@
+
+#include "descriptor-heap-d3d12.h"
+
+namespace gfx {
+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 gfx
+