Integrate RenderDoc frame capture into D3D12 minimal test

- Add SetDevice() and GetNumCaptures() methods to RenderDocCapture
- Fix initialization order: RenderDoc before D3D12, then SetDevice after
- Use nullptr for window param in StartFrameCapture/EndFrameCapture
- Add BeginCapture at frame 29, EndCapture at frame 30
- Set capture file path template to .\minimal_frame30
- Copy renderdoc.dll (26MB redistributable) to test output
- Engine/third_party/renderdoc/ now contains working renderdoc.dll

engine/include/XCEngine/Debug/RenderDocCapture.h

@@ -14,9 +14,11 @@ public:
 
     bool Initialize(void* device, void* window = nullptr);
     void Shutdown();
+    void SetDevice(void* device);
 
     bool IsLoaded() const { return m_isLoaded; }
     bool IsCapturing() const;
+    uint32_t GetNumCaptures() const;
 
     void BeginCapture(const char* title = nullptr);
     void EndCapture();

engine/src/Debug/RenderDocCapture.cpp

@@ -46,6 +46,10 @@ void RenderDocCapture::Shutdown() {
     }
 }
 
+void RenderDocCapture::SetDevice(void* device) {
+    m_device = device;
+}
+
 bool RenderDocCapture::LoadRenderDoc() {
     char exePath[MAX_PATH];
     GetModuleFileNameA(NULL, exePath, MAX_PATH);
@@ -104,6 +108,13 @@ bool RenderDocCapture::IsCapturing() const {
     return m_api->IsFrameCapturing() != 0;
 }
 
+uint32_t RenderDocCapture::GetNumCaptures() const {
+    if (!m_isLoaded || !m_api) {
+        return 0;
+    }
+    return m_api->GetNumCaptures();
+}
+
 void RenderDocCapture::BeginCapture(const char* title) {
     if (!m_isLoaded || !m_api) {
         return;
@@ -111,15 +122,14 @@ void RenderDocCapture::BeginCapture(const char* title) {
     if (title) {
         m_api->SetCaptureTitle(title);
     }
-    m_api->SetActiveWindow(m_device, m_window);
-    m_api->StartFrameCapture(m_device, m_window);
+    m_api->StartFrameCapture(m_device, nullptr);
 }
 
 void RenderDocCapture::EndCapture() {
     if (!m_isLoaded || !m_api) {
         return;
     }
-    m_api->EndFrameCapture(m_device, m_window);
+    m_api->EndFrameCapture(m_device, nullptr);
 }
 
 void RenderDocCapture::TriggerCapture() {