Function LoadAndCreateTexture

samples/test-harness/src/Textures.cpp:82–218

* Loads a texture from disk, creates a D3D12 GPU resource, and uploads the texels to the GPU. * Returns the index of the texture in the resources.textures array. * Uses format DXGI_FORMAT_R8G8B8A8_UNORM. * Does not make mips and puts the texture in state D3D12_RESOURCE_STATE_PIXEL_SHADER_RESOURCE. * An upload buffer is created and not freed until cleanup. */

* An upload buffer is created and not freed until cleanup.
*/
bool LoadAndCreateTexture(D3D12Global &d3d, D3D12Resources &resources, Texture &texture, int &index)
{
    // Load the texture from disk
    if (!LoadTexture(texture)) return false;

    // Create the texture resource on the default heap
    ID3D12Resource* textureResource = nullptr;
    {
        // Describe the texture resource
        D3D12_RESOURCE_DESC desc = {};
        desc.Dimension = D3D12_RESOURCE_DIMENSION_TEXTURE2D;
        desc.Alignment = 0;
        desc.Width = texture.width;
        desc.Height = texture.height;
        desc.DepthOrArraySize = 1;
        desc.MipLevels = 1;
        desc.Format = DXGI_FORMAT_R8G8B8A8_UNORM;
        desc.SampleDesc.Count = 1;
        desc.SampleDesc.Quality = 0;
        desc.Layout = D3D12_TEXTURE_LAYOUT_UNKNOWN;
        desc.Flags = D3D12_RESOURCE_FLAG_NONE;

        // Create the texture resource        
        HRESULT hr = d3d.device->CreateCommittedResource(&defaultHeapProps, D3D12_HEAP_FLAG_NONE, &desc, D3D12_RESOURCE_STATE_COPY_DEST, NULL, IID_PPV_ARGS(&textureResource));
        if (FAILED(hr)) return false;
#if defined(RTXGI_NAME_D3D_OBJECTS)
        std::string name = "Texture: ";
        name.append(texture.name);
        std::wstring n = std::wstring(name.begin(), name.end());
        textureResource->SetName(n.c_str());
#endif
    }

    UINT rowPitch = RTXGI_ALIGN(D3D12_TEXTURE_DATA_PITCH_ALIGNMENT, texture.width * texture.stride);
    ID3D12Resource* uploadBuffer = nullptr;

    // Create an upload buffer and copy texels into it
    {
        UINT uploadBufferSize = (rowPitch * texture.height);

        // Describe the upload buffer
        D3D12_RESOURCE_DESC desc = {};
        desc.Dimension = D3D12_RESOURCE_DIMENSION_BUFFER;
        desc.Alignment = 0;
        desc.Width = uploadBufferSize;
        desc.Height = 1;
        desc.DepthOrArraySize = 1;
        desc.MipLevels = 1;
        desc.Format = DXGI_FORMAT_UNKNOWN;
        desc.SampleDesc.Count = 1;
        desc.SampleDesc.Quality = 0;
        desc.Layout = D3D12_TEXTURE_LAYOUT_ROW_MAJOR;
        desc.Flags = D3D12_RESOURCE_FLAG_NONE;
        
        // Create the upload buffer        
        HRESULT hr = d3d.device->CreateCommittedResource(&uploadHeapProps, D3D12_HEAP_FLAG_NONE, &desc, D3D12_RESOURCE_STATE_GENERIC_READ, NULL, IID_PPV_ARGS(&uploadBuffer));
        if (FAILED(hr)) return false;
#if RTXGI_NAME_D3D_OBJECTS