Create free list heap for suballocation

src/gpu/vk/GrVkMemory.h

 /*
 * Copyright 2015 Google Inc.
 *
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */
 
 #ifndef GrVkMemory_DEFINED
 #define GrVkMemory_DEFINED
 
+#include "GrVkBuffer.h"
+#include "SkTArray.h"
+#include "SkTLList.h"
 #include "vk/GrVkDefines.h"
 #include "vk/GrVkTypes.h"
 
 class GrVkGpu;
 
 namespace GrVkMemory {
     /**
     * Allocates vulkan device memory and binds it to the gpu's device for the given object.
-    * Returns true of allocation succeeded.
+    * Returns true if allocation succeeded.
     */
     bool AllocAndBindBufferMemory(const GrVkGpu* gpu,
                                   VkBuffer buffer,
-                                  const VkMemoryPropertyFlags flags,
+                                  GrVkBuffer::Type type,
                                   GrVkAlloc* alloc);
-    void FreeBufferMemory(const GrVkGpu* gpu, const GrVkAlloc& alloc);
+    void FreeBufferMemory(const GrVkGpu* gpu, GrVkBuffer::Type type, const GrVkAlloc& alloc);
 
     bool AllocAndBindImageMemory(const GrVkGpu* gpu,
                                  VkImage image,
-                                 const VkMemoryPropertyFlags flags,
+                                 bool linearTiling,
                                  GrVkAlloc* alloc);
-    void FreeImageMemory(const GrVkGpu* gpu, const GrVkAlloc& alloc);
+    void FreeImageMemory(const GrVkGpu* gpu, bool linearTiling, const GrVkAlloc& alloc);
 
     VkPipelineStageFlags LayoutToPipelineStageFlags(const VkImageLayout layout);
 
     VkAccessFlags LayoutToSrcAccessMask(const VkImageLayout layout);
 }
 
+class GrVkSubHeap {
+public:
+    GrVkSubHeap(const GrVkGpu* gpu, uint32_t memoryTypeIndex, 
+                VkDeviceSize size, VkDeviceSize alignment);
+    ~GrVkSubHeap();
+
+    uint32_t  memoryTypeIndex() const { return fMemoryTypeIndex;  }
+    VkDeviceSize size() const { return fSize; }
+    VkDeviceSize alignment() const { return fAlignment; }
+    VkDeviceSize freeSize() const { return fFreeSize; }
+    VkDeviceSize largestBlockSize() const { return fLargestBlockSize; }
+    VkDeviceMemory memory() { return fAlloc; }
+
+    bool unallocated() const { return fSize == fFreeSize; }
+
+    bool alloc(VkDeviceSize size, GrVkAlloc* alloc);
+    void free(const GrVkAlloc& alloc);
+
+private:
+    struct Block {
+        VkDeviceSize fOffset;
+        VkDeviceSize fSize;
+    };
+    typedef SkTLList<Block, 16> FreeList;
+
+    const GrVkGpu* fGpu;
+    uint32_t       fMemoryTypeIndex;
+    VkDeviceSize   fSize;
+    VkDeviceSize   fAlignment;
+    VkDeviceSize   fFreeSize;
+    VkDeviceSize   fLargestBlockSize;
+    VkDeviceSize   fLargestBlockOffset;
+    VkDeviceMemory fAlloc;
+    FreeList       fFreeList;
+};
+
+class GrVkHeap {
+public:
+    enum Strategy {
+        kSubAlloc_Strategy,       // alloc large subheaps and suballoc within them
+        kSingleAlloc_Strategy     // alloc/recycle an individual subheap per object
+    };
+
+    GrVkHeap(const GrVkGpu* gpu, Strategy strategy, VkDeviceSize subHeapSize)
+        : fGpu(gpu)
+        , fSubHeapSize(subHeapSize)
+        , fAllocSize(0)
+        , fUsedSize(0) {
+        if (strategy == kSubAlloc_Strategy) {
+            fAllocFunc = &GrVkHeap::subAlloc;
+        } else {
+            fAllocFunc = &GrVkHeap::singleAlloc;
+        }
+    }
+
+    ~GrVkHeap();
+
+    bool alloc(VkDeviceSize size, VkDeviceSize alignment, uint32_t memoryTypeIndex, 
+               GrVkAlloc* alloc) {
+        return (*this.*fAllocFunc)(size, alignment, memoryTypeIndex, alloc);
+    }
+    bool free(const GrVkAlloc& alloc);
+
+private:
+    typedef bool (GrVkHeap::*AllocFunc)(VkDeviceSize size, VkDeviceSize alignment, 
+                                        uint32_t memoryTypeIndex, GrVkAlloc* alloc);
+
+    bool subAlloc(VkDeviceSize size, VkDeviceSize alignment, 
+                  uint32_t memoryTypeIndex, GrVkAlloc* alloc);
+    bool singleAlloc(VkDeviceSize size, VkDeviceSize alignment,
+                     uint32_t memoryTypeIndex, GrVkAlloc* alloc);
+
+    const GrVkGpu*         fGpu;
+    VkDeviceSize           fSubHeapSize;
+    VkDeviceSize           fAllocSize;
+    VkDeviceSize           fUsedSize;
+    AllocFunc              fAllocFunc;
+    SkTArray<SkAutoTDelete<GrVkSubHeap>> fSubHeaps;
+};
 #endif