[Feat] (MG_Backend/DirectVulkan): Buffer arena, buffer slice

2026-09-13 14:48:32 +09:00 · 2026-03-19 17:23:52 +08:00
parent 5e9f0f0c70
commit b6ac6c182e
8 changed files with 356 additions and 125 deletions
@@ -0,0 +1,56 @@
+// MobileGL - MobileGL/MG_Backend/DirectVulkan/Renderer/BufferArena.h
+// Copyright (c) 2025-2026 MobileGL-Dev
+// Licensed under the GNU Lesser General Public License v3.0:
+//   https://www.gnu.org/licenses/gpl-3.0.txt
+//   https://www.gnu.org/licenses/lgpl-3.0.txt
+// SPDX-License-Identifier: LGPL-3.0-only
+// End of Source File Header
+
+#pragma once
+
+#include "BufferSlice.h"
+#include "VkBufferObject.h"
+#include "../VkIncludes.h"
+#include <Includes.h>
+#include <vk_mem_alloc.h>
+
+namespace MobileGL::MG_Backend::DirectVulkan {
+    struct BufferArenaDesc {
+        VmaAllocator allocator = nullptr;
+        Uint32 frameCount = 0;
+        VkBufferUsageFlags usage = 0;
+        VmaMemoryUsage memoryUsage = VMA_MEMORY_USAGE_AUTO;
+        VmaAllocationCreateFlags allocationFlags = 0;
+        VkDeviceSize minBufferSize = 0;
+        Bool persistentlyMapped = false;
+    };
+
+    class BufferArena {
+    public:
+        Bool Initialize(const BufferArenaDesc& desc);
+        void Shutdown();
+
+        void BeginFrame(Uint32 frameIndex);
+        void ResetFrame(Uint32 frameIndex);
+        void CollectDeferredReleases(Uint32 frameIndex);
+
+        Bool Allocate(Uint32 frameIndex, VkDeviceSize size, VkDeviceSize alignment, BufferSlice& outSlice);
+        Bool Upload(Uint32 frameIndex, const void* data, VkDeviceSize size, VkDeviceSize alignment, BufferSlice& outSlice);
+
+        VkDeviceSize GetWriteCursor(Uint32 frameIndex) const;
+        Uint32 GetFrameCount() const;
+
+    private:
+        struct FrameResources {
+            VkBufferObject buffer;
+            VkDeviceSize writeCursor = 0;
+        };
+
+        Bool EnsureCapacity(Uint32 frameIndex, VkDeviceSize requiredEndOffset);
+        void AssertValidFrameIndex(Uint32 frameIndex) const;
+
+        BufferArenaDesc m_desc{};
+        Vector<FrameResources> m_frames;
+        Vector<Vector<VkBufferObject>> m_deferredReleases;
+    };
+} // namespace MobileGL::MG_Backend::DirectVulkan