feat: add RenderDocCapture to Debug module for frame capture debugging

- Add RenderDocCapture class for dynamic loading of renderdoc.dll
- Support BeginCapture/EndCapture/TriggerCapture APIs
- Add RenderDoc log category
- Add unit tests for RenderDocCapture in tests/debug

tests/debug/CMakeLists.txt

@@ -3,6 +3,7 @@ find_package(GTest REQUIRED)
 add_executable(debug_tests
     test_logger.cpp
     test_profiler.cpp
+    test_renderdoc_capture.cpp
 )
 
 target_link_libraries(debug_tests
@@ -12,5 +13,11 @@ target_link_libraries(debug_tests
     GTest::gtest_main
 )
 
+add_custom_command(TARGET debug_tests POST_BUILD
+    COMMAND ${CMAKE_COMMAND} -E copy_if_different
+        ${CMAKE_SOURCE_DIR}/engine/third_party/renderdoc/renderdoc.dll
+        $<TARGET_FILE_DIR:debug_tests>/
+)
+
 include(GoogleTest)
 gtest_discover_tests(debug_tests)

tests/debug/test_renderdoc_capture.cpp

@@ -0,0 +1,51 @@
+#include <gtest/gtest.h>
+#include "XCEngine/Debug/RenderDocCapture.h"
+
+using namespace XCEngine::Debug;
+
+TEST(RenderDocCaptureTest, Initialize) {
+    auto* rc = &RenderDocCapture::Get();
+    bool result = rc->Initialize(nullptr, nullptr);
+    EXPECT_TRUE(result) << "RenderDoc initialization failed - check if renderdoc.dll is available";
+    EXPECT_TRUE(rc->IsLoaded());
+}
+
+TEST(RenderDocCaptureTest, Shutdown) {
+    auto* rc = &RenderDocCapture::Get();
+    rc->Initialize(nullptr, nullptr);
+    ASSERT_TRUE(rc->IsLoaded()) << "RenderDoc not loaded";
+    rc->Shutdown();
+}
+
+TEST(RenderDocCaptureTest, BeginEndCapture) {
+    auto* rc = &RenderDocCapture::Get();
+    rc->Initialize(nullptr, nullptr);
+    ASSERT_TRUE(rc->IsLoaded()) << "RenderDoc not loaded";
+
+    rc->BeginCapture("UnitTestCapture");
+    rc->EndCapture();
+}
+
+TEST(RenderDocCaptureTest, TriggerCapture) {
+    auto* rc = &RenderDocCapture::Get();
+    rc->Initialize(nullptr, nullptr);
+    ASSERT_TRUE(rc->IsLoaded()) << "RenderDoc not loaded";
+
+    rc->TriggerCapture();
+}
+
+TEST(RenderDocCaptureTest, SetCaptureFilePath) {
+    auto* rc = &RenderDocCapture::Get();
+    rc->Initialize(nullptr, nullptr);
+    ASSERT_TRUE(rc->IsLoaded()) << "RenderDoc not loaded";
+
+    rc->SetCaptureFilePath(".\\test_captures");
+}
+
+TEST(RenderDocCaptureTest, SetCaptureComments) {
+    auto* rc = &RenderDocCapture::Get();
+    rc->Initialize(nullptr, nullptr);
+    ASSERT_TRUE(rc->IsLoaded()) << "RenderDoc not loaded";
+
+    rc->SetCaptureComments("Unit test capture");
+}