RV_VKCommandBuffer.h

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/*
 * PROPRIETARY INFORMATION.  This software is proprietary to
 * Side Effects Software Inc., and is not to be reproduced,
 * transmitted, or disclosed in any way without written permission.
 *
 * NAME:        RV_VKCommandBuffer.h ( RV Library, C++)
 *
 * COMMENTS:
 *      Class for creating Vulkan Command Buffer
 *      and other resources used with it
 */

#ifndef RV_VKCommandBuffer_h
#define RV_VKCommandBuffer_h

#include "RV_API.h"

#include "RV_VK.h"
#include "RV_Instance.h"
#include "RV_VKPipeline.h"

#include <UT/UT_Array.h>
#include <UT/UT_Function.h>
#include <UT/UT_SharedPtr.h>

#include <functional>
#include <utility>

class RV_VKCommandPool;
class RV_VKQueue;

class RV_API RV_VKCommandBuffer {
public:    
    static RV_VKCommandBuffer* allocate(
            RV_Instance* inst,
            RV_VKCommandPool* cmd_pool);

    VkCommandBuffer getVkCmdBuf() 
        {   UT_ASSERT_MSG(myIsRecording, 
                "Using VKCommandBuffer that is not recording: "
                "check that you haven't flushed the buffer");
            return myVkCmdBuf; 
        }
    RV_VKCommandPool *getCmdPool()
        { return myCmdPool; }

    void beginRecording();
    void endRecording();

    void addWaitSemaphore(VkSemaphore sem, VkPipelineStageFlags stage);
    void addSignalSemaphore(VkSemaphore sem, VkPipelineStageFlags stage);

    bool waitForFinish();

    // TODO: replace with lifecycle enum?
    bool isRecording() const;
    bool isExecuting();

    // Callbacks to be run when the CommandBuffer is finished running
    //  Won't be run immediately, immediate synchronization should use
    //  `waitForFinish()` or wait on a timeline semaphore
    using Callback = UT_Function<void(RV_Instance*)>;

    void handleCompletionCallbacks(RV_Instance* inst)
    {
        // MUST be done executing
        UT_ASSERT(!isExecuting());
        if(isExecuting()) {
            return;
        }

        // run all callbacks
        for (auto& callback : myCompletionCallbacks)
        {
            callback(inst);
        }

        // clear list
        myCompletionCallbacks.clear();
    }

    void handleSubmissionCallbacks(RV_Instance* inst)
    {
        // run all callbacks
        for (auto& callback : mySubmissionCallbacks)
        {
            callback(inst);
        }

        // clear list
        mySubmissionCallbacks.clear();
    }

    void addCompletionCallback(const Callback &callback)
    {
        myCompletionCallbacks.append(callback);
    }

    void addSubmissionCallback(const Callback &callback)
    {
        mySubmissionCallbacks.append(callback);
    }

    ~RV_VKCommandBuffer();

    // disable copy
    RV_VKCommandBuffer(const RV_VKCommandBuffer&) = delete;
    RV_VKCommandBuffer& operator=(const RV_VKCommandBuffer&) = delete;

public:
    // Rendering State
    RV_VKPipelineStateInfo myPipeState;
    // TODO: Current Pipeline
    // TODO: Vertex Buffer
    // TODO: Index Buffer
    // TODO: Transform Feedback Buffer
protected:
    // main resources
    VkCommandBuffer myVkCmdBuf;       
    class RV_VKCommandPool* myCmdPool;
    RV_Instance* myInst = nullptr;

    // Creation info
    VkCommandBufferLevel myLevel = VK_COMMAND_BUFFER_LEVEL_PRIMARY;

    // Current status
    bool myIsRecording = false;

    // Synchronization Primitives
    VkFence myCompleteFence;

    UT_Array<VkPipelineStageFlags> myWaitStages;
    UT_Array<VkSemaphore> myWaitSems;

    UT_Array<VkPipelineStageFlags> mySignalStages;
    UT_Array<VkSemaphore> mySignalSems;

    // Keep a list of callbacks
    UT_Array<Callback> myCompletionCallbacks;
    UT_Array<Callback> mySubmissionCallbacks;

    RV_VKCommandBuffer(
            RV_Instance* inst,
            RV_VKCommandPool* cmd_pool,
            VkCommandBuffer cmd_buf,
            const VkCommandBufferAllocateInfo& info,
            VkFence fence)
        : myInst(inst)
        , myCmdPool(cmd_pool)
        , myVkCmdBuf(cmd_buf)
        , myLevel(info.level)
        , myCompleteFence(fence)
    {
    }

    friend class RV_Instance;
    friend class RV_VKCommandPool;
    friend class RV_VKQueue;
};

// Helper class for callback that owns UniquePtr
//  and destroys it when called
template<class T>
class RV_DestroyPtrTask
{
public:
    UT_SharedPtr<T> myObj;

    void operator()(RV_Instance*)
    {
        myObj.reset();
    }

    RV_DestroyPtrTask(UT_UniquePtr<T> obj)
    : myObj(std::move(obj))
    {}
};

template<class T>
RV_VKCommandBuffer::Callback
RVmakeDestroyPtrTask(UT_UniquePtr<T> obj)
{
    return RV_VKCommandBuffer::Callback{RV_DestroyPtrTask<T>(std::move(obj))};
}

#endif