Implements gsys::MemBuffer

lib/gsys/CMakeLists.txt

@@ -4,6 +4,7 @@ add_library(gsys OBJECT
   include/gsys/gsysMaskedProjLight.h
   include/gsys/gsysMaskedProjLight.h
   include/gsys/gsysMaskedSpotLight.h
+  include/gsys/gsysMemBuffer.h
   include/gsys/gsysModel.h
   include/gsys/gsysModelAccessKey.h
   include/gsys/gsysModelNW.h
@@ -16,6 +17,7 @@ add_library(gsys OBJECT
   include/gsys/gsysPointLight.h
   include/gsys/gsysSpotLight.h
 
+  src/gsys/gsysMemBuffer.cpp
   src/gsys/gsysModelAccessKey.cpp
   src/gsys/gsysModelSceneConfig.cpp
   src/gsys/gsysParticleConfig.cpp

lib/gsys/include/gsys/gsysMemBuffer.h

@@ -0,0 +1,23 @@
+#pragma once
+
+#include <basis/seadTypes.h>
+#include <heap/seadHeap.h>
+
+namespace gsys {
+
+class MemBuffer {
+public:
+    MemBuffer();
+    virtual ~MemBuffer();
+
+    void* alloc(size_t size, u32 align);
+    void tryAlloc(sead::Heap* heap, size_t size, u32 align);
+    void free();
+
+private:
+    void* mBuffer = nullptr;
+    uintptr_t mOffset = 0;
+    size_t mSize = 0;
+};
+
+}  // namespace gsys

lib/gsys/src/gsys/gsysMemBuffer.cpp

@@ -0,0 +1,32 @@
+#include "gsys/gsysMemBuffer.h"
+
+#include <basis/seadNew.h>
+#include <heap/seadHeapMgr.h>
+#include <math/seadMathCalcCommon.h>
+
+namespace gsys {
+
+MemBuffer::MemBuffer() = default;
+MemBuffer::~MemBuffer() = default;
+
+void MemBuffer::tryAlloc(sead::Heap* heap, size_t size, u32 align) {
+    if (!heap)
+        heap = sead::HeapMgr::sInstancePtr->getCurrentHeap();
+    void* buffer = heap->tryAlloc(size, static_cast<s32>(align));
+    mSize = size;
+    mOffset = 0;
+    mBuffer = buffer;
+}
+
+void* MemBuffer::alloc(size_t size, u32 align) {
+    uintptr_t current = mOffset + reinterpret_cast<uintptr_t>(mBuffer);
+    uintptr_t aligned = sead::MathSizeT::roundUp(current, align);
+    mOffset += aligned - current + size;
+    return reinterpret_cast<void*>(aligned);
+}
+
+void MemBuffer::free() {
+    delete static_cast<u8*>(mBuffer);
+}
+
+}  // namespace gsys