Optimize rendering performance by adding idle state handling and continuous render check (#5)

Author: russlank

src/BinXray/UI/Application.cpp

@@ -233,6 +233,13 @@ bool Application::initialize(HINSTANCE hInstance) {
 int Application::run() {
     MSG msg = {};
     while (m_running && msg.message != WM_QUIT) {
+        // If nothing requires continuous rendering, sleep until the OS
+        // delivers an input/paint/timer message.  This drops CPU and GPU
+        // utilization to near-zero when the application is idle.
+        if (!needsContinuousRender()) {
+            ::MsgWaitForMultipleObjects(0, nullptr, FALSE, INFINITE, QS_ALLINPUT);
+        }
+
         while (::PeekMessage(&msg, nullptr, 0U, 0U, PM_REMOVE)) {
             ::TranslateMessage(&msg);
             ::DispatchMessage(&msg);
@@ -468,6 +475,16 @@ void Application::invalidateSeek() {
     }
 }
 
+bool Application::needsContinuousRender() const noexcept {
+    // Auto-rotation advances yaw every frame.
+    if (m_3dModeEnabled && m_3dAutoRotate) return true;
+    // Async file load needs polling each frame.
+    if (m_isLoadingFile) return true;
+    // Pending data recomputation.
+    if (m_matrixDirty) return true;
+    return false;
+}
+
 void Application::updateSeekFromPlot(float originX, float originY, float plotSize) {
     if (!m_seek.seekEnabled || m_seek.frozen) {
         return;

src/BinXray/UI/Application.h

@@ -90,6 +90,9 @@ class Application {
     void updateSeekFromPlot(float originX, float originY, float plotSize);
     void invalidateSeek();
 
+    /// True when ongoing animation or async work requires per-frame rendering.
+    [[nodiscard]] bool needsContinuousRender() const noexcept;
+
     // ---- D3D11 lifecycle ----------------------------------------------------
     bool createDeviceD3D(HWND hWnd);
     void cleanupDeviceD3D();

src/BinXray/Version.h

@@ -4,7 +4,7 @@
 
 #define BXR_VERSION_MAJOR 0
 #define BXR_VERSION_MINOR 4
-#define BXR_VERSION_PATCH 1
+#define BXR_VERSION_PATCH 2
 #define BXR_VERSION_BUILD 0
 
 #define BXR_VERSION_FILEVERSION BXR_VERSION_MAJOR, BXR_VERSION_MINOR, BXR_VERSION_PATCH, BXR_VERSION_BUILD