#include"VKDevice.h"

VK_NAMESPACE_BEGIN
namespace
{
    bool CreateVulkanBuffer(VulkanBuffer &vb,const DeviceAttribute *rsa,VkBufferUsageFlags buf_usage,VkDeviceSize size,const void *data,VkSharingMode sharing_mode)
    {
        VkBufferCreateInfo buf_info={};
        buf_info.sType=VK_STRUCTURE_TYPE_BUFFER_CREATE_INFO;
        buf_info.pNext=nullptr;
        buf_info.usage=buf_usage;
        buf_info.size=size;
        buf_info.queueFamilyIndexCount=0;
        buf_info.pQueueFamilyIndices=nullptr;
        buf_info.sharingMode=sharing_mode;
        buf_info.flags=0;

        if(vkCreateBuffer(rsa->device,&buf_info,nullptr,&vb.buffer)!=VK_SUCCESS)
            return(false);

        VkMemoryRequirements mem_reqs;
        vkGetBufferMemoryRequirements(rsa->device,vb.buffer,&mem_reqs);

        VkMemoryAllocateInfo alloc_info={};
        alloc_info.sType=VK_STRUCTURE_TYPE_MEMORY_ALLOCATE_INFO;
        alloc_info.pNext=nullptr;
        alloc_info.memoryTypeIndex=0;
        alloc_info.allocationSize=mem_reqs.size;

        if(rsa->CheckMemoryType(mem_reqs.memoryTypeBits,VK_MEMORY_PROPERTY_HOST_VISIBLE_BIT|VK_MEMORY_PROPERTY_HOST_COHERENT_BIT,&alloc_info.memoryTypeIndex))
        {
            if(vkAllocateMemory(rsa->device,&alloc_info,nullptr,&vb.memory)==VK_SUCCESS)
            {
                if(vkBindBufferMemory(rsa->device,vb.buffer,vb.memory,0)==VK_SUCCESS)
                {
                    vb.info.buffer=vb.buffer;
                    vb.info.offset=0;
                    vb.info.range=size;

                    if(!data)
                        return(true);

                    {
                        void *dst;

                        if(vkMapMemory(rsa->device,vb.memory,0,size,0,&dst)==VK_SUCCESS)
                        {
                            memcpy(dst,data,size);
                            vkUnmapMemory(rsa->device,vb.memory);
                            return(true);
                        }
                    }
                }

                vkFreeMemory(rsa->device,vb.memory,nullptr);
            }
        }

        vkDestroyBuffer(rsa->device,vb.buffer,nullptr);
        return(false);
    }
}//namespace

VertexBuffer *Device::CreateVBO(VkFormat format,uint32_t count,const void *data,VkSharingMode sharing_mode)
{
    const uint32_t stride=GetStrideByFormat(format);

    if(stride==0)
    {
        std::cerr<<"format["<<format<<"] stride length is 0,please use \"Device::CreateBuffer(VkBufferUsageFlags,VkDeviceSize,VkSharingMode)\" function.";
        return(nullptr);
    }

    const VkDeviceSize size=stride*count;

    VulkanBuffer vb;

    if(!CreateVulkanBuffer(vb,attr,VK_BUFFER_USAGE_VERTEX_BUFFER_BIT,size,data,sharing_mode))
        return(nullptr);

    return(new VertexBuffer(attr->device,vb,format,stride,count));
}

IndexBuffer *Device::CreateIBO(VkIndexType index_type,uint32_t count,const void *data,VkSharingMode sharing_mode)
{
    uint32_t stride;

    if(index_type==VK_INDEX_TYPE_UINT16)stride=2;else
        if(index_type==VK_INDEX_TYPE_UINT32)stride=4;else
            return(nullptr);

    const VkDeviceSize size=stride*count;

    VulkanBuffer vb;

    if(!CreateVulkanBuffer(vb,attr,VK_BUFFER_USAGE_INDEX_BUFFER_BIT,size,data,sharing_mode))
        return(nullptr);

    return(new IndexBuffer(attr->device,vb,index_type,count));
}

Buffer *Device::CreateBuffer(VkBufferUsageFlags buf_usage,VkDeviceSize size,const void *data,VkSharingMode sharing_mode)
{
    VulkanBuffer vb;

    if(!CreateVulkanBuffer(vb,attr,buf_usage,size,data,sharing_mode))
        return(nullptr);

    return(new Buffer(attr->device,vb));
}
VK_NAMESPACE_END