perf(debug): memory of the process and of its parts in the debug panel: resident, peak and private memory, card memory (GL_NVX_gpu_memory_info), the copies kept by the textures, geometry banks, models, scenery shapes and lines, sleepers and sound buffers

utilities/memorystats.h

@@ -0,0 +1,44 @@
+/*
+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
+http://mozilla.org/MPL/2.0/.
+*/
+
+#pragma once
+
+#include <cstdint>
+#include <vector>
+
+// memory of the process, as the system counts it, for the debug panel
+struct process_memory
+{
+	bool valid{false};
+	std::uint64_t resident{0}; // in physical memory now (working set, resident set)
+	std::uint64_t peak{0}; // the most it was in physical memory
+	std::uint64_t committed{0}; // private memory the process asked for, in physical memory or not (private bytes; 0 where not known)
+};
+
+process_memory query_process_memory();
+
+// what a part of the program keeps in memory: things and bytes
+struct memory_count
+{
+	std::uint64_t count{0};
+	std::uint64_t bytes{0};
+
+	memory_count &operator+=(memory_count const &Other)
+	{
+		count += Other.count;
+		bytes += Other.bytes;
+		return *this;
+	}
+};
+
+// bytes a vector keeps for its elements
+template <typename Type_> std::uint64_t memory_of(std::vector<Type_> const &Vector)
+{
+	return static_cast<std::uint64_t>(Vector.capacity()) * sizeof(Type_);
+}