Add request-level clear control for camera rendering

engine/include/XCEngine/Rendering/CameraRenderRequest.h

@@ -1,5 +1,6 @@
 #pragma once
 
+#include <XCEngine/Rendering/RenderCameraData.h>
 #include <XCEngine/Rendering/RenderContext.h>
 #include <XCEngine/Rendering/RenderSurface.h>
 
@@ -17,6 +18,7 @@ struct CameraRenderRequest {
     RenderContext context;
     RenderSurface surface;
     float cameraDepth = 0.0f;
+    RenderClearFlags clearFlags = RenderClearFlags::All;
 
     bool IsValid() const {
         return scene != nullptr &&

engine/include/XCEngine/Rendering/RenderCameraData.h

@@ -9,12 +9,34 @@
 namespace XCEngine {
 namespace Rendering {
 
+enum class RenderClearFlags : uint8_t {
+    None = 0,
+    Color = 1 << 0,
+    Depth = 1 << 1,
+    All = (1 << 0) | (1 << 1)
+};
+
+constexpr RenderClearFlags operator|(RenderClearFlags lhs, RenderClearFlags rhs) {
+    return static_cast<RenderClearFlags>(
+        static_cast<uint8_t>(lhs) | static_cast<uint8_t>(rhs));
+}
+
+constexpr RenderClearFlags operator&(RenderClearFlags lhs, RenderClearFlags rhs) {
+    return static_cast<RenderClearFlags>(
+        static_cast<uint8_t>(lhs) & static_cast<uint8_t>(rhs));
+}
+
+constexpr bool HasRenderClearFlag(RenderClearFlags flags, RenderClearFlags flag) {
+    return static_cast<uint8_t>(flags & flag) != 0;
+}
+
 struct RenderCameraData {
     Math::Matrix4x4 view = Math::Matrix4x4::Identity();
     Math::Matrix4x4 projection = Math::Matrix4x4::Identity();
     Math::Matrix4x4 viewProjection = Math::Matrix4x4::Identity();
     Math::Vector3 worldPosition = Math::Vector3::Zero();
     Math::Color clearColor = Math::Color::Black();
+    RenderClearFlags clearFlags = RenderClearFlags::All;
     uint32_t viewportWidth = 0;
     uint32_t viewportHeight = 0;
 };