1 files changed, 266 insertions, 0 deletions
diff --git a/support/hololens/ServoApp/Content/SpinningCubeRenderer.cpp b/support/hololens/ServoApp/Content/SpinningCubeRenderer.cpp
new file mode 100644
index 00000000000..c76119bccf7
--- /dev/null
+++ b/support/hololens/ServoApp/Content/SpinningCubeRenderer.cpp
@@ -0,0 +1,266 @@
+#include "pch.h"
+#include "SpinningCubeRenderer.h"
+#include "Common/DirectXHelper.h"
+
+using namespace Immersive;
+using namespace DirectX;
+using namespace winrt::Windows::Foundation::Numerics;
+using namespace winrt::Windows::UI::Input::Spatial;
+
+// Loads vertex and pixel shaders from files and instantiates the cube geometry.
+SpinningCubeRenderer::SpinningCubeRenderer(
+    std::shared_ptr<DX::DeviceResources> const &deviceResources)
+    : m_deviceResources(deviceResources) {
+  CreateDeviceDependentResources();
+}
+
+// This function uses a SpatialPointerPose to position the world-locked hologram
+// two meters in front of the user's heading.
+void SpinningCubeRenderer::PositionHologram(
+    SpatialPointerPose const &pointerPose) {
+  if (pointerPose != nullptr) {
+    // Get the gaze direction relative to the given coordinate system.
+    const float3 headPosition = pointerPose.Head().Position();
+    const float3 headDirection = pointerPose.Head().ForwardDirection();
+
+    // The hologram is positioned two meters along the user's gaze direction.
+    constexpr float distanceFromUser = 2.0f; // meters
+    const float3 gazeAtTwoMeters =
+        headPosition + (distanceFromUser * headDirection);
+
+    // This will be used as the translation component of the hologram's
+    // model transform.
+    SetPosition(gazeAtTwoMeters);
+  }
+}
+
+// Called once per frame. Rotates the cube, and calculates and sets the model
+// matrix relative to the position transform indicated by
+// hologramPositionTransform.
+void SpinningCubeRenderer::Update(DX::StepTimer const &timer) {
+  // Rotate the cube.
+  // Convert degrees to radians, then convert seconds to rotation angle.
+  const float radiansPerSecond = XMConvertToRadians(m_degreesPerSecond);
+  const double totalRotation = timer.GetTotalSeconds() * radiansPerSecond;
+  const float radians = static_cast<float>(fmod(totalRotation, XM_2PI));
+  const XMMATRIX modelRotation = XMMatrixRotationY(-radians);
+
+  // Position the cube.
+  const XMMATRIX modelTranslation =
+      XMMatrixTranslationFromVector(XMLoadFloat3(&m_position));
+
+  // Multiply to get the transform matrix.
+  // Note that this transform does not enforce a particular coordinate system.
+  // The calling class is responsible for rendering this content in a consistent
+  // manner.
+  const XMMATRIX modelTransform =
+      XMMatrixMultiply(modelRotation, modelTranslation);
+
+  // The view and projection matrices are provided by the system; they are
+  // associated with holographic cameras, and updated on a per-camera basis.
+  // Here, we provide the model transform for the sample hologram. The model
+  // transform matrix is transposed to prepare it for the shader.
+  XMStoreFloat4x4(&m_modelConstantBufferData.model,
+                  XMMatrixTranspose(modelTransform));
+
+  // Loading is asynchronous. Resources must be created before they can be
+  // updated.
+  if (!m_loadingComplete) {
+    return;
+  }
+
+  // Use the D3D device context to update Direct3D device-based resources.
+  const auto context = m_deviceResources->GetD3DDeviceContext();
+
+  // Update the model transform buffer for the hologram.
+  context->UpdateSubresource(m_modelConstantBuffer.Get(), 0, nullptr,
+                             &m_modelConstantBufferData, 0, 0);
+}
+
+// Renders one frame using the vertex and pixel shaders.
+// On devices that do not support the D3D11_FEATURE_D3D11_OPTIONS3::
+// VPAndRTArrayIndexFromAnyShaderFeedingRasterizer optional feature,
+// a pass-through geometry shader is also used to set the render
+// target array index.
+void SpinningCubeRenderer::Render() {
+  // Loading is asynchronous. Resources must be created before drawing can
+  // occur.
+  if (!m_loadingComplete) {
+    return;
+  }
+
+  const auto context = m_deviceResources->GetD3DDeviceContext();
+
+  // Each vertex is one instance of the VertexPositionColor struct.
+  const UINT stride = sizeof(VertexPositionColor);
+  const UINT offset = 0;
+  context->IASetVertexBuffers(0, 1, m_vertexBuffer.GetAddressOf(), &stride,
+                              &offset);
+  context->IASetIndexBuffer(m_indexBuffer.Get(),
+                            DXGI_FORMAT_R16_UINT, // Each index is one 16-bit
+                                                  // unsigned integer (short).
+                            0);
+  context->IASetPrimitiveTopology(D3D11_PRIMITIVE_TOPOLOGY_TRIANGLELIST);
+  context->IASetInputLayout(m_inputLayout.Get());
+
+  // Attach the vertex shader.
+  context->VSSetShader(m_vertexShader.Get(), nullptr, 0);
+  // Apply the model constant buffer to the vertex shader.
+  context->VSSetConstantBuffers(0, 1, m_modelConstantBuffer.GetAddressOf());
+
+  if (!m_usingVprtShaders) {
+    // On devices that do not support the D3D11_FEATURE_D3D11_OPTIONS3::
+    // VPAndRTArrayIndexFromAnyShaderFeedingRasterizer optional feature,
+    // a pass-through geometry shader is used to set the render target
+    // array index.
+    context->GSSetShader(m_geometryShader.Get(), nullptr, 0);
+  }
+
+  // Attach the pixel shader.
+  context->PSSetShader(m_pixelShader.Get(), nullptr, 0);
+
+  // Draw the objects.
+  context->DrawIndexedInstanced(m_indexCount, // Index count per instance.
+                                2,            // Instance count.
+                                0,            // Start index location.
+                                0,            // Base vertex location.
+                                0             // Start instance location.
+  );
+}
+
+std::future<void> SpinningCubeRenderer::CreateDeviceDependentResources() {
+  m_usingVprtShaders = m_deviceResources->GetDeviceSupportsVprt();
+
+  // On devices that do support the D3D11_FEATURE_D3D11_OPTIONS3::
+  // VPAndRTArrayIndexFromAnyShaderFeedingRasterizer optional feature
+  // we can avoid using a pass-through geometry shader to set the render
+  // target array index, thus avoiding any overhead that would be
+  // incurred by setting the geometry shader stage.
+  std::wstring vertexShaderFileName = m_usingVprtShaders
+                                          ? L"ms-appx:///VprtVertexShader.cso"
+                                          : L"ms-appx:///VertexShader.cso";
+
+  // Shaders will be loaded asynchronously.
+
+  // After the vertex shader file is loaded, create the shader and input layout.
+  std::vector<byte> vertexShaderFileData =
+      co_await DX::ReadDataAsync(vertexShaderFileName);
+  winrt::check_hresult(m_deviceResources->GetD3DDevice()->CreateVertexShader(
+      vertexShaderFileData.data(), vertexShaderFileData.size(), nullptr,
+      &m_vertexShader));
+
+  constexpr std::array<D3D11_INPUT_ELEMENT_DESC, 2> vertexDesc = {{
+      {"POSITION", 0, DXGI_FORMAT_R32G32B32_FLOAT, 0, 0,
+       D3D11_INPUT_PER_VERTEX_DATA, 0},
+      {"COLOR", 0, DXGI_FORMAT_R32G32B32_FLOAT, 0, 12,
+       D3D11_INPUT_PER_VERTEX_DATA, 0},
+  }};
+
+  winrt::check_hresult(m_deviceResources->GetD3DDevice()->CreateInputLayout(
+      vertexDesc.data(), static_cast<UINT>(vertexDesc.size()),
+      vertexShaderFileData.data(),
+      static_cast<UINT>(vertexShaderFileData.size()), &m_inputLayout));
+
+  // After the pixel shader file is loaded, create the shader and constant
+  // buffer.
+  std::vector<byte> pixelShaderFileData =
+      co_await DX::ReadDataAsync(L"ms-appx:///PixelShader.cso");
+  winrt::check_hresult(m_deviceResources->GetD3DDevice()->CreatePixelShader(
+      pixelShaderFileData.data(), pixelShaderFileData.size(), nullptr,
+      &m_pixelShader));
+
+  const CD3D11_BUFFER_DESC constantBufferDesc(sizeof(ModelConstantBuffer),
+                                              D3D11_BIND_CONSTANT_BUFFER);
+  winrt::check_hresult(m_deviceResources->GetD3DDevice()->CreateBuffer(
+      &constantBufferDesc, nullptr, &m_modelConstantBuffer));
+
+  if (!m_usingVprtShaders) {
+    // Load the pass-through geometry shader.
+    std::vector<byte> geometryShaderFileData =
+        co_await DX::ReadDataAsync(L"ms-appx:///GeometryShader.cso");
+
+    // After the pass-through geometry shader file is loaded, create the shader.
+    winrt::check_hresult(
+        m_deviceResources->GetD3DDevice()->CreateGeometryShader(
+            geometryShaderFileData.data(), geometryShaderFileData.size(),
+            nullptr, &m_geometryShader));
+  }
+
+  // Load mesh vertices. Each vertex has a position and a color.
+  // Note that the cube size has changed from the default DirectX app
+  // template. Windows Holographic is scaled in meters, so to draw the
+  // cube at a comfortable size we made the cube width 0.2 m (20 cm).
+  static const std::array<VertexPositionColor, 8> cubeVertices = {{
+      {XMFLOAT3(-0.1f, -0.1f, -0.1f), XMFLOAT3(0.0f, 0.0f, 0.0f)},
+      {XMFLOAT3(-0.1f, -0.1f, 0.1f), XMFLOAT3(0.0f, 0.0f, 1.0f)},
+      {XMFLOAT3(-0.1f, 0.1f, -0.1f), XMFLOAT3(0.0f, 1.0f, 0.0f)},
+      {XMFLOAT3(-0.1f, 0.1f, 0.1f), XMFLOAT3(0.0f, 1.0f, 1.0f)},
+      {XMFLOAT3(0.1f, -0.1f, -0.1f), XMFLOAT3(1.0f, 0.0f, 0.0f)},
+      {XMFLOAT3(0.1f, -0.1f, 0.1f), XMFLOAT3(1.0f, 0.0f, 1.0f)},
+      {XMFLOAT3(0.1f, 0.1f, -0.1f), XMFLOAT3(1.0f, 1.0f, 0.0f)},
+      {XMFLOAT3(0.1f, 0.1f, 0.1f), XMFLOAT3(1.0f, 1.0f, 1.0f)},
+  }};
+
+  D3D11_SUBRESOURCE_DATA vertexBufferData = {0};
+  vertexBufferData.pSysMem = cubeVertices.data();
+  vertexBufferData.SysMemPitch = 0;
+  vertexBufferData.SysMemSlicePitch = 0;
+  const CD3D11_BUFFER_DESC vertexBufferDesc(
+      sizeof(VertexPositionColor) * static_cast<UINT>(cubeVertices.size()),
+      D3D11_BIND_VERTEX_BUFFER);
+  winrt::check_hresult(m_deviceResources->GetD3DDevice()->CreateBuffer(
+      &vertexBufferDesc, &vertexBufferData, &m_vertexBuffer));
+
+  // Load mesh indices. Each trio of indices represents
+  // a triangle to be rendered on the screen.
+  // For example: 2,1,0 means that the vertices with indexes
+  // 2, 1, and 0 from the vertex buffer compose the
+  // first triangle of this mesh.
+  // Note that the winding order is clockwise by default.
+  constexpr std::array<unsigned short, 36> cubeIndices = {{
+      2, 1, 0, // -x
+      2, 3, 1,
+
+      6, 4, 5, // +x
+      6, 5, 7,
+
+      0, 1, 5, // -y
+      0, 5, 4,
+
+      2, 6, 7, // +y
+      2, 7, 3,
+
+      0, 4, 6, // -z
+      0, 6, 2,
+
+      1, 3, 7, // +z
+      1, 7, 5,
+  }};
+
+  m_indexCount = static_cast<unsigned int>(cubeIndices.size());
+
+  D3D11_SUBRESOURCE_DATA indexBufferData = {0};
+  indexBufferData.pSysMem = cubeIndices.data();
+  indexBufferData.SysMemPitch = 0;
+  indexBufferData.SysMemSlicePitch = 0;
+  CD3D11_BUFFER_DESC indexBufferDesc(sizeof(unsigned short) *
+                                         static_cast<UINT>(cubeIndices.size()),
+                                     D3D11_BIND_INDEX_BUFFER);
+  winrt::check_hresult(m_deviceResources->GetD3DDevice()->CreateBuffer(
+      &indexBufferDesc, &indexBufferData, &m_indexBuffer));
+
+  // Once the cube is loaded, the object is ready to be rendered.
+  m_loadingComplete = true;
+};
+
+void SpinningCubeRenderer::ReleaseDeviceDependentResources() {
+  m_loadingComplete = false;
+  m_usingVprtShaders = false;
+  m_vertexShader.Reset();
+  m_inputLayout.Reset();
+  m_pixelShader.Reset();
+  m_geometryShader.Reset();
+  m_modelConstantBuffer.Reset();
+  m_vertexBuffer.Reset();
+  m_indexBuffer.Reset();
+}