#include "XCEngine/RHI/D3D12/D3D12ShaderResourceView.h"

namespace XCEngine {
namespace RHI {

D3D12ShaderResourceView::D3D12ShaderResourceView()
    : m_handle({0})
    , m_resource(nullptr) {
}

D3D12ShaderResourceView::~D3D12ShaderResourceView() {
    Shutdown();
}

void D3D12ShaderResourceView::Initialize(ID3D12Device* device, ID3D12Resource* resource, const D3D12_SHADER_RESOURCE_VIEW_DESC* desc) {
    m_resource = resource;
    m_handle = {};
    device->CreateShaderResourceView(resource, desc, m_handle);
}

void D3D12ShaderResourceView::InitializeAt(ID3D12Device* device, ID3D12Resource* resource, D3D12_CPU_DESCRIPTOR_HANDLE handle, const D3D12_SHADER_RESOURCE_VIEW_DESC* desc) {
    m_resource = resource;
    m_handle = handle;
    device->CreateShaderResourceView(resource, desc, m_handle);
}

void D3D12ShaderResourceView::Shutdown() {
    m_handle = {};
    m_resource = nullptr;
}

D3D12_SHADER_RESOURCE_VIEW_DESC D3D12ShaderResourceView::CreateDesc(Format format, D3D12_SRV_DIMENSION dimension, uint32_t mipLevels) {
    D3D12_SHADER_RESOURCE_VIEW_DESC desc = {};
    desc.Format = ToD3D12(format);
    desc.Shader4ComponentMapping = D3D12_DEFAULT_SHADER_4_COMPONENT_MAPPING;
    desc.ViewDimension = dimension;
    if (dimension == D3D12_SRV_DIMENSION_TEXTURE2D) {
        desc.Texture2D.MipLevels = mipLevels;
    }
    return desc;
}

} // namespace RHI
} // namespace XCEngine