[NFC] Simplify window size handling

benchmarks/graphics_pipeline/GraphicsBenchmarkApp.cpp

@@ -179,8 +179,6 @@ void GraphicsBenchmarkApp::Config(ppx::ApplicationSettings& settings)
 {
     settings.appName                    = "graphics_pipeline";
     settings.enableImGui                = true;
-    settings.window.width               = 1920;
-    settings.window.height              = 1080;
     settings.grfx.api                   = kApi;
     settings.grfx.numFramesInFlight     = 1;
     settings.grfx.swapchain.depthFormat = grfx::FORMAT_D32_FLOAT;
@@ -192,6 +190,7 @@ void GraphicsBenchmarkApp::Config(ppx::ApplicationSettings& settings)
 #endif
     settings.standardKnobsDefaultValue.enableMetrics        = true;
     settings.standardKnobsDefaultValue.overwriteMetricsFile = true;
+    settings.standardKnobsDefaultValue.resolution           = std::make_pair(1920, 1080);
 }
 
 void GraphicsBenchmarkApp::Setup()

include/ppx/application.h

@@ -129,8 +129,6 @@ struct ApplicationSettings
 
     struct
     {
-        uint32_t    width     = 0;
-        uint32_t    height    = 0;
         std::string title     = "";
         bool        resizable = false;
     } window;
@@ -198,7 +196,7 @@ struct ApplicationSettings
         bool                     listGpus              = false;
         std::string              metricsFilename       = "report_@.json";
         bool                     overwriteMetricsFile  = false;
-        std::pair<int, int>      resolution            = std::make_pair(0, 0);
+        std::pair<int, int>      resolution            = std::make_pair(1280, 720);
         uint32_t                 runTimeMs             = 0;
         int                      screenshotFrameNumber = -1;
         std::string              screenshotPath        = "screenshot_frame_#.ppm";
@@ -219,7 +217,7 @@ class Application
 {
 public:
     Application();
-    Application(uint32_t windowWidth, uint32_t windowHeight, const char* windowTitle);
+    Application(const char* windowTitle);
     virtual ~Application();
 
     static Application* Get();
@@ -288,15 +286,27 @@ class Application
 
     const ApplicationSettings* GetSettings() const { return &mSettings; }
     const StandardOptions&     GetStandardOptions() const { return mStandardOpts; }
-    uint32_t                   GetWindowWidth() const { return mSettings.window.width; }
-    uint32_t                   GetWindowHeight() const { return mSettings.window.height; }
     bool                       IsWindowIconified() const;
     bool                       IsWindowMaximized() const;
     uint32_t                   GetUIWidth() const;
     uint32_t                   GetUIHeight() const;
-    float                      GetWindowAspect() const { return static_cast<float>(mSettings.window.width) / static_cast<float>(mSettings.window.height); }
-    grfx::Rect                 GetScissor() const;
-    grfx::Viewport             GetViewport(float minDepth = 0.0f, float maxDepth = 1.0f) const;
+
+    std::pair<uint32_t, uint32_t> GetWindowSize() const
+    {
+        return mWindow != nullptr ? mWindow->Size() : mStandardOpts.pResolution->GetValue();
+    }
+
+    uint32_t GetWindowWidth() const { return GetWindowSize().first; }
+    uint32_t GetWindowHeight() const { return GetWindowSize().second; }
+
+    float GetWindowAspect() const
+    {
+        const auto size = GetWindowSize();
+        return static_cast<float>(size.first) / static_cast<float>(size.second);
+    }
+
+    grfx::Rect     GetScissor() const;
+    grfx::Viewport GetViewport(float minDepth = 0.0f, float maxDepth = 1.0f) const;
 
     // Loads a DXIL or SPV shader from baseDir.
     //

include/ppx/command_line_parser.h

@@ -55,6 +55,12 @@ class CliOptions
     // not counting multiple appearances of the same flag such as: --assets-path a --assets-path b
     size_t GetNumUniqueOptions() const { return mAllOptions.size(); }
 
+    // Returns true if the given option is present in the commandline. False otherwise.
+    bool HasOption(const std::string& optionName) const
+    {
+        return mAllOptions.cend() != mAllOptions.find(optionName);
+    }
+
     // Tries to parse the option string into the type of the default value and return it.
     // If the value fails to be converted, return the specified default value.
     // Warning: If this is called instead of the vector overload for multiple-value flags,

include/ppx/knob.h

@@ -376,13 +376,13 @@ class KnobFlag final
 {
 public:
     KnobFlag(const std::string& flagName, T defaultValue)
-        : Knob(flagName, false)
+        : Knob(flagName, false), mDirty(false)
     {
         SetValue(defaultValue);
     }
 
     KnobFlag(const std::string& flagName, T defaultValue, T minValue, T maxValue)
-        : Knob(flagName, false)
+        : Knob(flagName, false), mDirty(false)
     {
         static_assert(std::is_arithmetic_v<T>, "KnobFlag can only be defined with min/max when it's of arithmetic type");
         PPX_ASSERT_MSG(minValue < maxValue, "invalid range to initialize KnobFlag");
@@ -400,6 +400,8 @@ class KnobFlag final
 
     T GetValue() const { return mValue; }
 
+    bool IsDefaultValue() const { return !mDirty; }
+
     void SetValidator(std::function<bool(T)> validatorFunc) { mValidatorFunc = validatorFunc; }
 
 private:
@@ -418,6 +420,8 @@ class KnobFlag final
 
     void UpdateFromFlags(const CliOptions& opts) override
     {
+        if (opts.HasOption(mFlagName))
+            mDirty = true;
         SetValue(opts.GetOptionValueOrDefault(mFlagName, mValue));
     }
 
@@ -438,6 +442,7 @@ class KnobFlag final
 private:
     T                      mValue;
     std::function<bool(T)> mValidatorFunc;
+    bool                   mDirty;
 };
 
 // KnobManager holds the knobs in an application

include/ppx/window.h

@@ -42,6 +42,15 @@ struct WindowSize
     WindowSize() = default;
     WindowSize(uint32_t width_, uint32_t height_)
         : width(width_), height(height_) {}
+    WindowSize(const std::pair<int, int>&& size)
+        : WindowSize(size.first, size.second) {}
+    WindowSize(const std::pair<uint32_t, uint32_t>&& size)
+        : WindowSize(size.first, size.second) {}
+
+    operator std::pair<uint32_t, uint32_t>()
+    {
+        return {width, height};
+    }
 
     bool operator==(const WindowSize& other) const { return width == other.width && height == other.height; };
 };

include/ppx/xr_component.h

@@ -127,14 +127,14 @@ struct XrComponentCreateInfo
 #else
     grfx::Format colorFormat = grfx::FORMAT_B8G8R8A8_SRGB;
 #endif
-    grfx::Format            depthFormat          = grfx::FORMAT_D32_FLOAT;
-    XrRefSpace              refSpaceType         = XrRefSpace::XR_STAGE;
-    XrViewConfigurationType viewConfigType       = XR_VIEW_CONFIGURATION_TYPE_PRIMARY_STEREO;
-    bool                    enableDebug          = false;
-    bool                    enableQuadLayer      = false;
-    bool                    enableDepthSwapchain = false;
-    XrComponentResolution   resolution           = {0, 0};
-    XrComponentResolution   uiResolution         = {0, 0};
+    grfx::Format                         depthFormat          = grfx::FORMAT_D32_FLOAT;
+    XrRefSpace                           refSpaceType         = XrRefSpace::XR_STAGE;
+    XrViewConfigurationType              viewConfigType       = XR_VIEW_CONFIGURATION_TYPE_PRIMARY_STEREO;
+    bool                                 enableDebug          = false;
+    bool                                 enableQuadLayer      = false;
+    bool                                 enableDepthSwapchain = false;
+    std::optional<XrComponentResolution> resolution           = (XrComponentResolution){0, 0};
+    XrComponentResolution                uiResolution         = {0, 0};
 
     std::vector<std::string> requiredExtensions = {};
 };
@@ -174,16 +174,16 @@ class XrComponent
     {
         if (mConfigViews.empty())
             return 0;
-        if (mCreateInfo.resolution.width > 0)
-            return mCreateInfo.resolution.width;
+        if (mCreateInfo.resolution.has_value())
+            return mCreateInfo.resolution->width;
         return mConfigViews[0].recommendedImageRectWidth;
     }
     uint32_t GetHeight() const
     {
         if (mConfigViews.empty())
             return 0;
-        if (mCreateInfo.resolution.height > 0)
-            return mCreateInfo.resolution.height;
+        if (mCreateInfo.resolution.has_value())
+            return mCreateInfo.resolution->height;
         return mConfigViews[0].recommendedImageRectHeight;
     }
     uint32_t GetUIWidth() const

projects/async_compute/main.cpp

@@ -147,11 +147,11 @@ void ProjApp::Config(ppx::ApplicationSettings& settings)
     settings.appName                       = "async_compute";
     settings.enableImGui                   = true;
     settings.grfx.api                      = kApi;
-    settings.window.width                  = 1920;
-    settings.window.height                 = 1080;
     settings.grfx.swapchain.imageCount     = mNumFramesInFlight;
     settings.grfx.device.computeQueueCount = 1;
     settings.grfx.numFramesInFlight        = mNumFramesInFlight;
+
+    settings.standardKnobsDefaultValue.resolution = std::make_pair(1920, 1080);
 }
 
 void ProjApp::Setup()

projects/gltf/main.cpp

@@ -161,10 +161,10 @@ void ProjApp::Config(ppx::ApplicationSettings& settings)
 {
     settings.appName                    = "gltf";
     settings.enableImGui                = true;
-    settings.window.width               = 1920;
-    settings.window.height              = 1080;
     settings.grfx.api                   = kApi;
     settings.grfx.swapchain.depthFormat = grfx::FORMAT_D32_FLOAT;
+
+    settings.standardKnobsDefaultValue.resolution = std::make_pair(1920, 1080);
 }
 
 void ProjApp::LoadTexture(