Implement D3D12 backend

Source/Core/VideoBackends/D3D12/DXShader.cpp

@@ -0,0 +1,55 @@
+// Copyright 2019 Dolphin Emulator Project
+// Licensed under GPLv2+
+// Refer to the license.txt file included.
+
+#include "VideoBackends/D3D12/DXShader.h"
+#include "VideoBackends/D3D12/Common.h"
+#include "VideoBackends/D3D12/DXContext.h"
+
+namespace DX12
+{
+DXShader::DXShader(ShaderStage stage, BinaryData bytecode)
+    : D3DCommon::Shader(stage, std::move(bytecode))
+{
+}
+
+DXShader::~DXShader() = default;
+
+std::unique_ptr<DXShader> DXShader::CreateFromBytecode(ShaderStage stage, BinaryData bytecode)
+{
+  std::unique_ptr<DXShader> shader(new DXShader(stage, std::move(bytecode)));
+  if (stage == ShaderStage::Compute && !shader->CreateComputePipeline())
+    return nullptr;
+
+  return shader;
+}
+
+std::unique_ptr<DXShader> DXShader::CreateFromSource(ShaderStage stage, const char* source,
+                                                     size_t length)
+{
+  BinaryData bytecode;
+  if (!CompileShader(g_dx_context->GetFeatureLevel(), &bytecode, stage, source, length))
+    return nullptr;
+
+  return CreateFromBytecode(stage, std::move(bytecode));
+}
+
+D3D12_SHADER_BYTECODE DXShader::GetD3DByteCode() const
+{
+  return D3D12_SHADER_BYTECODE{m_bytecode.data(), m_bytecode.size()};
+}
+
+bool DXShader::CreateComputePipeline()
+{
+  D3D12_COMPUTE_PIPELINE_STATE_DESC desc = {};
+  desc.pRootSignature = g_dx_context->GetComputeRootSignature();
+  desc.CS = GetD3DByteCode();
+  desc.NodeMask = 1;
+
+  HRESULT hr = g_dx_context->GetDevice()->CreateComputePipelineState(
+      &desc, IID_PPV_ARGS(&m_compute_pipeline));
+  CHECK(SUCCEEDED(hr), "Creating compute pipeline failed");
+  return SUCCEEDED(hr);
+}
+
+}  // namespace DX12