From ecb7b99f27302188d853f09058bb94530697ada3 Mon Sep 17 00:00:00 2001
From: Vladyslav Baranovskyi <int17ist@gmail.com>
Date: Tue, 11 Jun 2024 14:03:13 +0300
Subject: [PATCH] Added PreformanceOverlayUiElement class

---
 .../Scene/UI/PerformanceOverlayUiElement.cpp  | 101 ++++++++++++++++++
 .../Scene/UI/PerformanceOverlayUiElement.hpp  |  31 ++++++
 2 files changed, 132 insertions(+)
 create mode 100644 openVulkanoCpp/Scene/UI/PerformanceOverlayUiElement.cpp
 create mode 100644 openVulkanoCpp/Scene/UI/PerformanceOverlayUiElement.hpp

diff --git a/openVulkanoCpp/Scene/UI/PerformanceOverlayUiElement.cpp b/openVulkanoCpp/Scene/UI/PerformanceOverlayUiElement.cpp
new file mode 100644
index 0000000..67da856
--- /dev/null
+++ b/openVulkanoCpp/Scene/UI/PerformanceOverlayUiElement.cpp
@@ -0,0 +1,101 @@
+/*
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/.
+ */
+
+#include "Scene/Ui/PerformanceOverlayUiElement.hpp"
+#include "Base/FrameMetadata.hpp"
+#include "Base/Utils.hpp"
+#include "Host/SystemInfo.hpp"
+#include "Math/ByteSize.hpp"
+
+#include <imgui.h>
+
+namespace OpenVulkano::Scene::UI
+{
+	namespace
+	{
+		float FloatValuesGetter(void *data, int index)
+		{
+			auto queue = reinterpret_cast<std::deque<float> *>(data);
+			return (*queue)[index];
+		}
+
+		float FPSValuesGetter(void *data, int index)
+		{
+			auto queue = reinterpret_cast<std::deque<float> *>(data);
+			float value = (*queue)[index];
+			if(value != 0)
+				return 1 / value;
+			else
+				return 0;
+		}
+
+		float RamValuesGetter(void *data, int index)
+		{
+			auto queue = reinterpret_cast<std::deque<float> *>(data);
+			float used = (*queue)[index];
+			float max = SystemInfo::GetAppRamMax();
+			float percentage = used / max * 100;
+			return percentage;
+		}
+	}
+
+	void PerformanceOverlayUiElement::UpdateQueues()
+	{
+		m_frameTimes.push_back(static_cast<float>(CURRENT_FRAME.frameTime));
+		while(m_frameTimes.size() > m_frameCount)
+			m_frameTimes.pop_front();
+
+		m_ramUsed.push_back(static_cast<float>(SystemInfo::GetAppRamUsed()));
+		while(m_ramUsed.size() > m_ramUsageCount)
+			m_ramUsed.pop_front();
+	}
+
+	void PerformanceOverlayUiElement::Init()
+	{
+	}
+
+	void PerformanceOverlayUiElement::BeginDraw()
+	{
+		bool alwaysShow = true;
+		ImGui::Begin("Debug Info", &alwaysShow);
+	}
+
+	void PerformanceOverlayUiElement::Draw()
+	{
+		UpdateQueues();
+
+		ImVec2 availableSize = ImGui::GetContentRegionAvail();
+		availableSize.y *= 1/3.;
+		if(ImGui::CollapsingHeader("Frame Times/FPS"))
+		{
+			ImGui::Text("Last Frame Time: %f s", m_frameTimes.back());
+			ImGui::SliderInt("Window Size", &m_frameCount, 10, 1000);
+			ImGui::PlotLines("", &FloatValuesGetter, &m_frameTimes, (int)m_frameTimes.size(), 0, nullptr, FLT_MAX, FLT_MAX, availableSize);
+
+			ImGui::Text("Last FPS: %f", 1 / m_frameTimes.back());
+			ImGui::PlotLines("", &FPSValuesGetter, &m_frameTimes, (int)m_frameTimes.size(), 0, nullptr, FLT_MAX, FLT_MAX, availableSize);
+		}
+
+		if(ImGui::CollapsingHeader("RAM Usage"))
+		{
+			// NOTE(vb) used and max return unexpected values - used is bigger than max... Is it intended to do so?
+			std::string used = Utils::PrettyBytes(SystemInfo::GetAppRamUsed());
+			std::string max = Utils::PrettyBytes(SystemInfo::GetAppRamMax());
+			std::string avail = Utils::PrettyBytes(SystemInfo::GetAppRamAvailable());
+			ImGui::Text("RAM: %s / %s, Free: %s", used.c_str(), max.c_str(), avail.c_str());
+
+			ImGui::SliderInt("Window Size", &m_ramUsageCount, 10, 1000);
+			float scaleMin = 0.01;
+			float scaleMax = 100;
+			ImGui::PlotLines("", &RamValuesGetter, &m_ramUsed, (int)m_ramUsed.size(), 0, nullptr, scaleMin, scaleMax, availableSize);
+		}
+	}
+
+	void PerformanceOverlayUiElement::EndDraw()
+	{
+		ImGui::End();
+	}
+}
\ No newline at end of file
diff --git a/openVulkanoCpp/Scene/UI/PerformanceOverlayUiElement.hpp b/openVulkanoCpp/Scene/UI/PerformanceOverlayUiElement.hpp
new file mode 100644
index 0000000..4af33e5
--- /dev/null
+++ b/openVulkanoCpp/Scene/UI/PerformanceOverlayUiElement.hpp
@@ -0,0 +1,31 @@
+/*
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/.
+ */
+
+#pragma once
+
+#include "Scene/Ui/Ui.hpp"
+
+#include <deque>
+
+namespace OpenVulkano::Scene::UI
+{
+	class PerformanceOverlayUiElement : public Ui
+	{
+		int m_frameCount = 200;
+		std::deque<float> m_frameTimes;
+
+		int m_ramUsageCount = 200;
+		std::deque<float> m_ramUsed;
+
+		void UpdateQueues();
+
+	protected:
+		void Init() override;
+		void BeginDraw() override;
+		void Draw() override;
+		void EndDraw() override;
+	};
+}