// Backend and DockBuilder declarations.
// These call into extern "C" wrappers in imgui_backend_c.cpp, compiled into ImGui.lib.

#scope_export

d3d12  :: #import "d3d12";
dxgi   :: #import "dxgi";
Windows :: #import "Windows";

// ImGui_ImplDX12_InitInfo — mirrors the C++ struct layout.
ImplDX12_InitInfo :: struct {
    Device:               *d3d12.ID3D12Device;
    CommandQueue:         *d3d12.ID3D12CommandQueue;
    NumFramesInFlight:    s32;
    RTVFormat:            dxgi.DXGI_FORMAT;
    DSVFormat:            dxgi.DXGI_FORMAT;
    UserData:             *void;
    SrvDescriptorHeap:    *d3d12.ID3D12DescriptorHeap;
    SrvDescriptorAllocFn: #type (info: *ImplDX12_InitInfo, out_cpu: *d3d12.D3D12_CPU_DESCRIPTOR_HANDLE, out_gpu: *d3d12.D3D12_GPU_DESCRIPTOR_HANDLE) #c_call;
    SrvDescriptorFreeFn:  #type (info: *ImplDX12_InitInfo, cpu: d3d12.D3D12_CPU_DESCRIPTOR_HANDLE, gpu: d3d12.D3D12_GPU_DESCRIPTOR_HANDLE) #c_call;
    // Legacy single-descriptor fields (IMGUI_DISABLE_OBSOLETE_FUNCTIONS not set)
    LegacySingleSrvCpuDescriptor: d3d12.D3D12_CPU_DESCRIPTOR_HANDLE;
    LegacySingleSrvGpuDescriptor: d3d12.D3D12_GPU_DESCRIPTOR_HANDLE;
}

// Win32 backend
ImplWin32_Init             :: (hwnd: *void) -> bool                                                              #foreign imgui "jai_ImGui_ImplWin32_Init";
ImplWin32_Shutdown         :: ()                                                                                 #foreign imgui "jai_ImGui_ImplWin32_Shutdown";
ImplWin32_NewFrame         :: ()                                                                                 #foreign imgui "jai_ImGui_ImplWin32_NewFrame";
ImplWin32_WndProcHandler   :: (hWnd: Windows.HWND, msg: u32, wParam: Windows.WPARAM, lParam: Windows.LPARAM) -> Windows.LRESULT #foreign imgui "jai_ImGui_ImplWin32_WndProcHandler";

// DX12 backend
ImplDX12_Init              :: (info: *ImplDX12_InitInfo) -> bool                                                 #foreign imgui "jai_ImGui_ImplDX12_Init";
ImplDX12_Shutdown          :: ()                                                                                 #foreign imgui "jai_ImGui_ImplDX12_Shutdown";
ImplDX12_NewFrame          :: ()                                                                                 #foreign imgui "jai_ImGui_ImplDX12_NewFrame";
ImplDX12_RenderDrawData    :: (draw_data: *ImDrawData, cmd_list: *d3d12.ID3D12GraphicsCommandList)               #foreign imgui "jai_ImGui_ImplDX12_RenderDrawData";

// DockBuilder (from imgui_internal.h)
DockBuilderRemoveNode      :: (node_id: ID)                                                                      #foreign imgui "jai_DockBuilderRemoveNode";
DockBuilderAddNode         :: (node_id: ID, flags: s32)                                                          #foreign imgui "jai_DockBuilderAddNode";
DockBuilderSetNodeSize     :: (node_id: ID, size: ImVec2)                                                        #foreign imgui "jai_DockBuilderSetNodeSize";
DockBuilderSplitNode       :: (node_id: ID, split_dir: s32, size_ratio: float32, out_id_at_dir: *ID, out_id_at_opposite_dir: *ID) -> ID #foreign imgui "jai_DockBuilderSplitNode";
DockBuilderDockWindow      :: (window_name: *u8, node_id: ID)                                                    #foreign imgui "jai_DockBuilderDockWindow";
DockBuilderFinish          :: (node_id: ID)                                                                      #foreign imgui "jai_DockBuilderFinish";

// Font loading
AddFontFromFileTTF         :: (filename: *u8, size_pixels: float32) -> *void                                     #foreign imgui "jai_AddFontFromFileTTF";