Function create_imgui_resources

modules/tools/asset_tool/imgui.cpp:18–108

SKR_EXTERN_C SKR_RUNTIME_API bool skr_runtime_is_dpi_aware();

void create_imgui_resources(SRenderDeviceId render_device, skr::render_graph::RenderGraph* renderGraph, skr_vfs_t* vfs)
{
    const auto device = renderGraph->get_backend_device();
    const auto backend = device->adapter->instance->backend;
    const auto gfx_queue = renderGraph->get_gfx_queue();
    ImGui::CreateContext();
    ImGuiIO& io = ImGui::GetIO(); 
    io.ConfigFlags |= ImGuiConfigFlags_NavEnableKeyboard;       // Enable Keyboard Controls
    io.ConfigFlags |= ImGuiConfigFlags_DockingEnable;           // Enable Docking
    io.ConfigFlags |= ImGuiConfigFlags_ViewportsEnable;         // Enable Multi-Viewport / Platform Windows
    ImGui::StyleColorsDark();
    {
        auto& style = ImGui::GetStyle();
        if (ImGui::GetIO().ConfigFlags & ImGuiConfigFlags_ViewportsEnable)
        {
            style.WindowRounding = 0.0f;
            style.Colors[ImGuiCol_WindowBg].w = 1.0f;
        }
        const char8_t* font_path = u8"./../resources/font/SourceSansPro-Regular.ttf";
        uint32_t *font_bytes, font_length;
        read_bytes(font_path, &font_bytes, &font_length);
        float dpi_scaling = 1.f;
        if (!skr_runtime_is_dpi_aware())
        {
            float ddpi;
            SDL_GetDisplayDPI(0, &ddpi, NULL, NULL);
            dpi_scaling = ddpi / OS_DPI;
            // scale back
            style.ScaleAllSizes(1.f / dpi_scaling);
            ImGui::GetIO().FontGlobalScale = 1.f / dpi_scaling;
        }
        else
        {
            float ddpi;
            SDL_GetDisplayDPI(0, &ddpi, NULL, NULL);
            dpi_scaling = ddpi / OS_DPI;
            // scale back
            style.ScaleAllSizes(dpi_scaling);
        }
        ImFontConfig cfg = {};
        cfg.SizePixels = 16.f * dpi_scaling;
        cfg.OversampleH = cfg.OversampleV = 1;
        cfg.PixelSnapH = true;
        ImGui::GetIO().Fonts->AddFontFromMemoryTTF(font_bytes,
        font_length, cfg.SizePixels, &cfg);
        ImGui::GetIO().Fonts->Build();
        free(font_bytes);
    }
    skr::String vsname = u8"shaders/imgui_vertex";
    skr::String fsname = u8"shaders/imgui_fragment";
    vsname.append(backend == ::CGPU_BACKEND_D3D12 ? u8".dxil" : u8".spv");
    fsname.append(backend == ::CGPU_BACKEND_D3D12 ? u8".dxil" : u8".spv");
    auto vsfile = skr_vfs_fopen(vfs, vsname.u8_str(), SKR_FM_READ_BINARY, SKR_FILE_CREATION_OPEN_EXISTING);
    uint32_t im_vs_length = (uint32_t)skr_vfs_fsize(vsfile);
    uint32_t* im_vs_bytes = (uint32_t*)sakura_malloc(im_vs_length);
    skr_vfs_fread(vsfile, im_vs_bytes, 0, im_vs_length);
    skr_vfs_fclose(vsfile);
    auto fsfile = skr_vfs_fopen(vfs, fsname.u8_str(), SKR_FM_READ_BINARY, SKR_FILE_CREATION_OPEN_EXISTING);