VulkanBuffer.h

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/*
 * Copyright 2022 Google LLC
 *
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */
 
#ifndef skgpu_graphite_VulkanBuffer_DEFINED
#define skgpu_graphite_VulkanBuffer_DEFINED
 
#include "include/gpu/vk/VulkanMemoryAllocator.h"
#include "src/gpu/graphite/Buffer.h"
#include "src/gpu/graphite/vk/VulkanSharedContext.h"
 
namespace skgpu::graphite {
 
class VulkanCommandBuffer;
 
class VulkanBuffer final : public Buffer {
public:
    static sk_sp<Buffer> Make(const VulkanSharedContext*, size_t, BufferType, AccessPattern);
    void freeGpuData() override;
    VkBuffer vkBuffer() const { return fBuffer; }
    VkBufferUsageFlags bufferUsageFlags() const { return fBufferUsageFlags; }
 
    void setBufferAccess(VulkanCommandBuffer* buffer,
                         VkAccessFlags dstAccessMask,
                         VkPipelineStageFlags dstStageMask) const;
 
private:
    VulkanBuffer(const VulkanSharedContext*,
                 size_t,
                 BufferType,
                 AccessPattern,
                 VkBuffer,
                 const skgpu::VulkanAlloc&,
                 VkBufferUsageFlags);
 
    void onMap() override;
    void onUnmap() override;
 
    void internalMap(size_t readOffset, size_t readSize);
    void internalUnmap(size_t flushOffset, size_t flushSize);
 
    bool isMappable() const { return fAlloc.fFlags & skgpu::VulkanAlloc::kMappable_Flag; }
 
    const VulkanSharedContext* vulkanSharedContext() const {
        return static_cast<const VulkanSharedContext*>(this->sharedContext());
    }
 
    static VkPipelineStageFlags AccessMaskToPipelineSrcStageFlags(const VkAccessFlags accessFlags);
 
    VkBuffer fBuffer;
    skgpu::VulkanAlloc fAlloc;
    const VkBufferUsageFlags fBufferUsageFlags;
    mutable VkAccessFlags fCurrentAccessMask = 0;
 
    /**
     * Buffers can either be mapped for:
     * 1) Reading from the CPU (The effect of writing would be undefined)
     * 2) Writing from the CPU (The existing contents are discarded. Even in the case where the
     *    initial contents are overwritten, CPU reads should be avoided for performance reasons as
     *    the memory may not be cached).
     */
    bool fBufferUsedForCPURead = false;
};
 
} // namespace skgpu::graphite
 
#endif // skgpu_graphite_VulkanBuffer_DEFINED