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-rw-r--r--src/common/CMakeLists.txt2
-rw-r--r--src/common/virtual_buffer.cpp52
-rw-r--r--src/common/virtual_buffer.h58
3 files changed, 112 insertions, 0 deletions
diff --git a/src/common/CMakeLists.txt b/src/common/CMakeLists.txt
index eeceaa655..6ffc612e7 100644
--- a/src/common/CMakeLists.txt
+++ b/src/common/CMakeLists.txt
@@ -155,6 +155,8 @@ add_library(common STATIC
uuid.cpp
uuid.h
vector_math.h
+ virtual_buffer.cpp
+ virtual_buffer.h
web_result.h
zstd_compression.cpp
zstd_compression.h
diff --git a/src/common/virtual_buffer.cpp b/src/common/virtual_buffer.cpp
new file mode 100644
index 000000000..b426f4747
--- /dev/null
+++ b/src/common/virtual_buffer.cpp
@@ -0,0 +1,52 @@
+// Copyright 2020 yuzu Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#ifdef _WIN32
+#include <windows.h>
+#else
+#include <stdio.h>
+#include <sys/mman.h>
+#include <sys/types.h>
+#if defined __APPLE__ || defined __FreeBSD__ || defined __OpenBSD__
+#include <sys/sysctl.h>
+#elif defined __HAIKU__
+#include <OS.h>
+#else
+#include <sys/sysinfo.h>
+#endif
+#endif
+
+#include "common/assert.h"
+#include "common/virtual_buffer.h"
+
+namespace Common {
+
+void* AllocateMemoryPages(std::size_t size) {
+#ifdef _WIN32
+ void* base{VirtualAlloc(nullptr, size, MEM_COMMIT, PAGE_READWRITE)};
+#else
+ void* base{mmap(nullptr, size, PROT_READ | PROT_WRITE, MAP_ANON | MAP_PRIVATE, -1, 0)};
+
+ if (base == MAP_FAILED) {
+ base = nullptr;
+ }
+#endif
+
+ ASSERT(base);
+
+ return base;
+}
+
+void FreeMemoryPages(void* base, std::size_t size) {
+ if (!base) {
+ return;
+ }
+#ifdef _WIN32
+ ASSERT(VirtualFree(base, 0, MEM_RELEASE));
+#else
+ ASSERT(munmap(base, size) == 0);
+#endif
+}
+
+} // namespace Common
diff --git a/src/common/virtual_buffer.h b/src/common/virtual_buffer.h
new file mode 100644
index 000000000..da064e59e
--- /dev/null
+++ b/src/common/virtual_buffer.h
@@ -0,0 +1,58 @@
+// Copyright 2020 yuzu Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include "common/common_funcs.h"
+
+namespace Common {
+
+void* AllocateMemoryPages(std::size_t size);
+void FreeMemoryPages(void* base, std::size_t size);
+
+template <typename T>
+class VirtualBuffer final : NonCopyable {
+public:
+ constexpr VirtualBuffer() = default;
+ explicit VirtualBuffer(std::size_t count) : alloc_size{count * sizeof(T)} {
+ base_ptr = reinterpret_cast<T*>(AllocateMemoryPages(alloc_size));
+ }
+
+ ~VirtualBuffer() {
+ FreeMemoryPages(base_ptr, alloc_size);
+ }
+
+ void resize(std::size_t count) {
+ FreeMemoryPages(base_ptr, alloc_size);
+
+ alloc_size = count * sizeof(T);
+ base_ptr = reinterpret_cast<T*>(AllocateMemoryPages(alloc_size));
+ }
+
+ constexpr const T& operator[](std::size_t index) const {
+ return base_ptr[index];
+ }
+
+ constexpr T& operator[](std::size_t index) {
+ return base_ptr[index];
+ }
+
+ constexpr T* data() {
+ return base_ptr;
+ }
+
+ constexpr const T* data() const {
+ return base_ptr;
+ }
+
+ constexpr std::size_t size() const {
+ return alloc_size / sizeof(T);
+ }
+
+private:
+ std::size_t alloc_size{};
+ T* base_ptr{};
+};
+
+} // namespace Common