backends/imgui_impl_dx9.cpp - external/github.com/ocornut/imgui - Git at Google

 // dear imgui: Renderer Backend for DirectX9
 // This needs to be used along with a Platform Backend (e.g. Win32)

 // Implemented features:
 //  [X] Renderer: User texture binding. Use 'LPDIRECT3DTEXTURE9' as ImTextureID. Read the FAQ about ImTextureID!
 //  [X] Renderer: Multi-viewport support. Enable with 'io.ConfigFlags |= ImGuiConfigFlags_ViewportsEnable'.
 //  [X] Renderer: Support for large meshes (64k+ vertices) with 16-bit indices.

 // You can copy and use unmodified imgui_impl_* files in your project. See examples/ folder for examples of using this.
 // If you are new to Dear ImGui, read documentation from the docs/ folder + read the top of imgui.cpp.
 // Read online: https://github.com/ocornut/imgui/tree/master/docs

 // CHANGELOG
 // (minor and older changes stripped away, please see git history for details)
 //  2020-XX-XX: Platform: Added support for multiple windows via the ImGuiPlatformIO interface.
 //  2019-05-29: DirectX9: Added support for large mesh (64K+ vertices), enable ImGuiBackendFlags_RendererHasVtxOffset flag.
 //  2019-04-30: DirectX9: Added support for special ImDrawCallback_ResetRenderState callback to reset render state.
 //  2019-03-29: Misc: Fixed erroneous assert in ImGui_ImplDX9_InvalidateDeviceObjects().
 //  2019-01-16: Misc: Disabled fog before drawing UI's. Fixes issue #2288.
 //  2018-11-30: Misc: Setting up io.BackendRendererName so it can be displayed in the About Window.
 //  2018-06-08: Misc: Extracted imgui_impl_dx9.cpp/.h away from the old combined DX9+Win32 example.
 //  2018-06-08: DirectX9: Use draw_data->DisplayPos and draw_data->DisplaySize to setup projection matrix and clipping rectangle.
 //  2018-05-07: Render: Saving/restoring Transform because they don't seem to be included in the StateBlock. Setting shading mode to Gouraud.
 //  2018-02-16: Misc: Obsoleted the io.RenderDrawListsFn callback and exposed ImGui_ImplDX9_RenderDrawData() in the .h file so you can call it yourself.
 //  2018-02-06: Misc: Removed call to ImGui::Shutdown() which is not available from 1.60 WIP, user needs to call CreateContext/DestroyContext themselves.

 #include "imgui.h"
 #include "imgui_impl_dx9.h"

 // DirectX
 #include <d3d9.h>
 #define DIRECTINPUT_VERSION 0x0800
 #include <dinput.h>

 // DirectX data
 static LPDIRECT3DDEVICE9        g_pd3dDevice = NULL;
 static LPDIRECT3DVERTEXBUFFER9  g_pVB = NULL;
 static LPDIRECT3DINDEXBUFFER9   g_pIB = NULL;
 static LPDIRECT3DTEXTURE9       g_FontTexture = NULL;
 static int                      g_VertexBufferSize = 5000, g_IndexBufferSize = 10000;

 struct CUSTOMVERTEX
 {
     float    pos[3];
     D3DCOLOR col;
     float    uv[2];
 };
 #define D3DFVF_CUSTOMVERTEX (D3DFVF_XYZ|D3DFVF_DIFFUSE|D3DFVF_TEX1)

 // Forward Declarations
 static void ImGui_ImplDX9_InitPlatformInterface();
 static void ImGui_ImplDX9_ShutdownPlatformInterface();
 static void ImGui_ImplDX9_CreateDeviceObjectsForPlatformWindows();
 static void ImGui_ImplDX9_InvalidateDeviceObjectsForPlatformWindows();

 static void ImGui_ImplDX9_SetupRenderState(ImDrawData* draw_data)
 {
     // Setup viewport
     D3DVIEWPORT9 vp;
     vp.X = vp.Y = 0;
     vp.Width = (DWORD)draw_data->DisplaySize.x;
     vp.Height = (DWORD)draw_data->DisplaySize.y;
     vp.MinZ = 0.0f;
     vp.MaxZ = 1.0f;
     g_pd3dDevice->SetViewport(&vp);

     // Setup render state: fixed-pipeline, alpha-blending, no face culling, no depth testing, shade mode (for gradient)
     g_pd3dDevice->SetPixelShader(NULL);
     g_pd3dDevice->SetVertexShader(NULL);
     g_pd3dDevice->SetRenderState(D3DRS_CULLMODE, D3DCULL_NONE);
     g_pd3dDevice->SetRenderState(D3DRS_LIGHTING, FALSE);
     g_pd3dDevice->SetRenderState(D3DRS_ZENABLE, FALSE);
     g_pd3dDevice->SetRenderState(D3DRS_ALPHABLENDENABLE, TRUE);
     g_pd3dDevice->SetRenderState(D3DRS_ALPHATESTENABLE, FALSE);
     g_pd3dDevice->SetRenderState(D3DRS_BLENDOP, D3DBLENDOP_ADD);
     g_pd3dDevice->SetRenderState(D3DRS_SRCBLEND, D3DBLEND_SRCALPHA);
     g_pd3dDevice->SetRenderState(D3DRS_DESTBLEND, D3DBLEND_INVSRCALPHA);
     g_pd3dDevice->SetRenderState(D3DRS_SCISSORTESTENABLE, TRUE);
     g_pd3dDevice->SetRenderState(D3DRS_SHADEMODE, D3DSHADE_GOURAUD);
     g_pd3dDevice->SetRenderState(D3DRS_FOGENABLE, FALSE);
     g_pd3dDevice->SetTextureStageState(0, D3DTSS_COLOROP, D3DTOP_MODULATE);
     g_pd3dDevice->SetTextureStageState(0, D3DTSS_COLORARG1, D3DTA_TEXTURE);
     g_pd3dDevice->SetTextureStageState(0, D3DTSS_COLORARG2, D3DTA_DIFFUSE);
     g_pd3dDevice->SetTextureStageState(0, D3DTSS_ALPHAOP, D3DTOP_MODULATE);
     g_pd3dDevice->SetTextureStageState(0, D3DTSS_ALPHAARG1, D3DTA_TEXTURE);
     g_pd3dDevice->SetTextureStageState(0, D3DTSS_ALPHAARG2, D3DTA_DIFFUSE);
     g_pd3dDevice->SetSamplerState(0, D3DSAMP_MINFILTER, D3DTEXF_LINEAR);
     g_pd3dDevice->SetSamplerState(0, D3DSAMP_MAGFILTER, D3DTEXF_LINEAR);

     // Setup orthographic projection matrix
     // Our visible imgui space lies from draw_data->DisplayPos (top left) to draw_data->DisplayPos+data_data->DisplaySize (bottom right). DisplayPos is (0,0) for single viewport apps.
     // Being agnostic of whether <d3dx9.h> or <DirectXMath.h> can be used, we aren't relying on D3DXMatrixIdentity()/D3DXMatrixOrthoOffCenterLH() or DirectX::XMMatrixIdentity()/DirectX::XMMatrixOrthographicOffCenterLH()
     {
         float L = draw_data->DisplayPos.x + 0.5f;
         float R = draw_data->DisplayPos.x + draw_data->DisplaySize.x + 0.5f;
         float T = draw_data->DisplayPos.y + 0.5f;
         float B = draw_data->DisplayPos.y + draw_data->DisplaySize.y + 0.5f;
         D3DMATRIX mat_identity = { { { 1.0f, 0.0f, 0.0f, 0.0f,  0.0f, 1.0f, 0.0f, 0.0f,  0.0f, 0.0f, 1.0f, 0.0f,  0.0f, 0.0f, 0.0f, 1.0f } } };
         D3DMATRIX mat_projection =
         { { {
             2.0f/(R-L),   0.0f,         0.0f,  0.0f,
             0.0f,         2.0f/(T-B),   0.0f,  0.0f,
             0.0f,         0.0f,         0.5f,  0.0f,
             (L+R)/(L-R),  (T+B)/(B-T),  0.5f,  1.0f
         } } };
         g_pd3dDevice->SetTransform(D3DTS_WORLD, &mat_identity);
         g_pd3dDevice->SetTransform(D3DTS_VIEW, &mat_identity);
         g_pd3dDevice->SetTransform(D3DTS_PROJECTION, &mat_projection);
     }
 }

 // Render function.
 void ImGui_ImplDX9_RenderDrawData(ImDrawData* draw_data)
 {
     // Avoid rendering when minimized
     if (draw_data->DisplaySize.x <= 0.0f || draw_data->DisplaySize.y <= 0.0f)
         return;

     // Create and grow buffers if needed
     if (!g_pVB || g_VertexBufferSize < draw_data->TotalVtxCount)
     {
         if (g_pVB) { g_pVB->Release(); g_pVB = NULL; }
         g_VertexBufferSize = draw_data->TotalVtxCount + 5000;
         if (g_pd3dDevice->CreateVertexBuffer(g_VertexBufferSize * sizeof(CUSTOMVERTEX), D3DUSAGE_DYNAMIC | D3DUSAGE_WRITEONLY, D3DFVF_CUSTOMVERTEX, D3DPOOL_DEFAULT, &g_pVB, NULL) < 0)
             return;
     }
     if (!g_pIB || g_IndexBufferSize < draw_data->TotalIdxCount)
     {
         if (g_pIB) { g_pIB->Release(); g_pIB = NULL; }
         g_IndexBufferSize = draw_data->TotalIdxCount + 10000;
         if (g_pd3dDevice->CreateIndexBuffer(g_IndexBufferSize * sizeof(ImDrawIdx), D3DUSAGE_DYNAMIC | D3DUSAGE_WRITEONLY, sizeof(ImDrawIdx) == 2 ? D3DFMT_INDEX16 : D3DFMT_INDEX32, D3DPOOL_DEFAULT, &g_pIB, NULL) < 0)
             return;
     }

     // Backup the DX9 state
     IDirect3DStateBlock9* d3d9_state_block = NULL;
     if (g_pd3dDevice->CreateStateBlock(D3DSBT_ALL, &d3d9_state_block) < 0)
         return;

     // Backup the DX9 transform (DX9 documentation suggests that it is included in the StateBlock but it doesn't appear to)
     D3DMATRIX last_world, last_view, last_projection;
     g_pd3dDevice->GetTransform(D3DTS_WORLD, &last_world);
     g_pd3dDevice->GetTransform(D3DTS_VIEW, &last_view);
     g_pd3dDevice->GetTransform(D3DTS_PROJECTION, &last_projection);

     // Copy and convert all vertices into a single contiguous buffer, convert colors to DX9 default format.
     // FIXME-OPT: This is a waste of resource, the ideal is to use imconfig.h and
     //  1) to avoid repacking colors:   #define IMGUI_USE_BGRA_PACKED_COLOR
     //  2) to avoid repacking vertices: #define IMGUI_OVERRIDE_DRAWVERT_STRUCT_LAYOUT struct ImDrawVert { ImVec2 pos; float z; ImU32 col; ImVec2 uv; }
     CUSTOMVERTEX* vtx_dst;
     ImDrawIdx* idx_dst;
     if (g_pVB->Lock(0, (UINT)(draw_data->TotalVtxCount * sizeof(CUSTOMVERTEX)), (void**)&vtx_dst, D3DLOCK_DISCARD) < 0)
         return;
     if (g_pIB->Lock(0, (UINT)(draw_data->TotalIdxCount * sizeof(ImDrawIdx)), (void**)&idx_dst, D3DLOCK_DISCARD) < 0)
         return;
     for (int n = 0; n < draw_data->CmdListsCount; n++)
     {
         const ImDrawList* cmd_list = draw_data->CmdLists[n];
         const ImDrawVert* vtx_src = cmd_list->VtxBuffer.Data;
         for (int i = 0; i < cmd_list->VtxBuffer.Size; i++)
         {
             vtx_dst->pos[0] = vtx_src->pos.x;
             vtx_dst->pos[1] = vtx_src->pos.y;
             vtx_dst->pos[2] = 0.0f;
             vtx_dst->col = (vtx_src->col & 0xFF00FF00) | ((vtx_src->col & 0xFF0000) >> 16) | ((vtx_src->col & 0xFF) << 16);     // RGBA --> ARGB for DirectX9
             vtx_dst->uv[0] = vtx_src->uv.x;
             vtx_dst->uv[1] = vtx_src->uv.y;
             vtx_dst++;
             vtx_src++;
         }
         memcpy(idx_dst, cmd_list->IdxBuffer.Data, cmd_list->IdxBuffer.Size * sizeof(ImDrawIdx));
         idx_dst += cmd_list->IdxBuffer.Size;
     }
     g_pVB->Unlock();
     g_pIB->Unlock();
     g_pd3dDevice->SetStreamSource(0, g_pVB, 0, sizeof(CUSTOMVERTEX));
     g_pd3dDevice->SetIndices(g_pIB);
     g_pd3dDevice->SetFVF(D3DFVF_CUSTOMVERTEX);

     // Setup desired DX state
     ImGui_ImplDX9_SetupRenderState(draw_data);

     // Render command lists
     // (Because we merged all buffers into a single one, we maintain our own offset into them)
     int global_vtx_offset = 0;
     int global_idx_offset = 0;
     ImVec2 clip_off = draw_data->DisplayPos;
     for (int n = 0; n < draw_data->CmdListsCount; n++)
     {
         const ImDrawList* cmd_list = draw_data->CmdLists[n];
         for (int cmd_i = 0; cmd_i < cmd_list->CmdBuffer.Size; cmd_i++)
         {
             const ImDrawCmd* pcmd = &cmd_list->CmdBuffer[cmd_i];
             if (pcmd->UserCallback != NULL)
             {
                 // User callback, registered via ImDrawList::AddCallback()
                 // (ImDrawCallback_ResetRenderState is a special callback value used by the user to request the renderer to reset render state.)
                 if (pcmd->UserCallback == ImDrawCallback_ResetRenderState)
                     ImGui_ImplDX9_SetupRenderState(draw_data);
                 else
                     pcmd->UserCallback(cmd_list, pcmd);
             }
             else
             {
                 const RECT r = { (LONG)(pcmd->ClipRect.x - clip_off.x), (LONG)(pcmd->ClipRect.y - clip_off.y), (LONG)(pcmd->ClipRect.z - clip_off.x), (LONG)(pcmd->ClipRect.w - clip_off.y) };
                 const LPDIRECT3DTEXTURE9 texture = (LPDIRECT3DTEXTURE9)pcmd->TextureId;
                 g_pd3dDevice->SetTexture(0, texture);
                 g_pd3dDevice->SetScissorRect(&r);
                 g_pd3dDevice->DrawIndexedPrimitive(D3DPT_TRIANGLELIST, pcmd->VtxOffset + global_vtx_offset, 0, (UINT)cmd_list->VtxBuffer.Size, pcmd->IdxOffset + global_idx_offset, pcmd->ElemCount / 3);
             }
         }
         global_idx_offset += cmd_list->IdxBuffer.Size;
         global_vtx_offset += cmd_list->VtxBuffer.Size;
     }

     // When using multi-viewports, it appears that there's an odd logic in DirectX9 which prevent subsequent windows
     // from rendering until the first window submits at least one draw call, even once. That's our workaround. (see #2560)
     if (global_vtx_offset == 0)
         g_pd3dDevice->DrawIndexedPrimitive(D3DPT_TRIANGLELIST, 0, 0, 0, 0, 0);

     // Restore the DX9 transform
     g_pd3dDevice->SetTransform(D3DTS_WORLD, &last_world);
     g_pd3dDevice->SetTransform(D3DTS_VIEW, &last_view);
     g_pd3dDevice->SetTransform(D3DTS_PROJECTION, &last_projection);

     // Restore the DX9 state
     d3d9_state_block->Apply();
     d3d9_state_block->Release();
 }

 bool ImGui_ImplDX9_Init(IDirect3DDevice9* device)
 {
     // Setup backend capabilities flags
     ImGuiIO& io = ImGui::GetIO();
     io.BackendRendererName = "imgui_impl_dx9";
     io.BackendFlags |= ImGuiBackendFlags_RendererHasVtxOffset;  // We can honor the ImDrawCmd::VtxOffset field, allowing for large meshes.
     io.BackendFlags |= ImGuiBackendFlags_RendererHasViewports;  // We can create multi-viewports on the Renderer side (optional)

     g_pd3dDevice = device;
     g_pd3dDevice->AddRef();

     if (io.ConfigFlags & ImGuiConfigFlags_ViewportsEnable)
         ImGui_ImplDX9_InitPlatformInterface();

     return true;
 }

 void ImGui_ImplDX9_Shutdown()
 {
     ImGui_ImplDX9_ShutdownPlatformInterface();
     ImGui_ImplDX9_InvalidateDeviceObjects();
     if (g_pd3dDevice) { g_pd3dDevice->Release(); g_pd3dDevice = NULL; }
 }

 static bool ImGui_ImplDX9_CreateFontsTexture()
 {
     // Build texture atlas
     ImGuiIO& io = ImGui::GetIO();
     unsigned char* pixels;
     int width, height, bytes_per_pixel;
     io.Fonts->GetTexDataAsRGBA32(&pixels, &width, &height, &bytes_per_pixel);

     // Upload texture to graphics system
     g_FontTexture = NULL;
     if (g_pd3dDevice->CreateTexture(width, height, 1, D3DUSAGE_DYNAMIC, D3DFMT_A8R8G8B8, D3DPOOL_DEFAULT, &g_FontTexture, NULL) < 0)
         return false;
     D3DLOCKED_RECT tex_locked_rect;
     if (g_FontTexture->LockRect(0, &tex_locked_rect, NULL, 0) != D3D_OK)
         return false;
     for (int y = 0; y < height; y++)
         memcpy((unsigned char*)tex_locked_rect.pBits + tex_locked_rect.Pitch * y, pixels + (width * bytes_per_pixel) * y, (width * bytes_per_pixel));
     g_FontTexture->UnlockRect(0);

     // Store our identifier
     io.Fonts->TexID = (ImTextureID)g_FontTexture;

     return true;
 }

 bool ImGui_ImplDX9_CreateDeviceObjects()
 {
     if (!g_pd3dDevice)
         return false;
     if (!ImGui_ImplDX9_CreateFontsTexture())
         return false;
     ImGui_ImplDX9_CreateDeviceObjectsForPlatformWindows();
     return true;
 }

 void ImGui_ImplDX9_InvalidateDeviceObjects()
 {
     if (!g_pd3dDevice)
         return;
     if (g_pVB) { g_pVB->Release(); g_pVB = NULL; }
     if (g_pIB) { g_pIB->Release(); g_pIB = NULL; }
     if (g_FontTexture) { g_FontTexture->Release(); g_FontTexture = NULL; ImGui::GetIO().Fonts->TexID = NULL; } // We copied g_pFontTextureView to io.Fonts->TexID so let's clear that as well.
     ImGui_ImplDX9_InvalidateDeviceObjectsForPlatformWindows();
 }

 void ImGui_ImplDX9_NewFrame()
 {
     if (!g_FontTexture)
         ImGui_ImplDX9_CreateDeviceObjects();
 }

 //--------------------------------------------------------------------------------------------------------
 // MULTI-VIEWPORT / PLATFORM INTERFACE SUPPORT
 // This is an _advanced_ and _optional_ feature, allowing the backend to create and handle multiple viewports simultaneously.
 // If you are new to dear imgui or creating a new binding for dear imgui, it is recommended that you completely ignore this section first..
 //--------------------------------------------------------------------------------------------------------

 // Helper structure we store in the void* RenderUserData field of each ImGuiViewport to easily retrieve our backend data.
 struct ImGuiViewportDataDx9
 {
     IDirect3DSwapChain9*    SwapChain;
     D3DPRESENT_PARAMETERS   d3dpp;

     ImGuiViewportDataDx9()  { SwapChain = NULL; ZeroMemory(&d3dpp, sizeof(D3DPRESENT_PARAMETERS)); }
     ~ImGuiViewportDataDx9() { IM_ASSERT(SwapChain == NULL); }
 };

 static void ImGui_ImplDX9_CreateWindow(ImGuiViewport* viewport)
 {
     ImGuiViewportDataDx9* data = IM_NEW(ImGuiViewportDataDx9)();
     viewport->RendererUserData = data;

     // PlatformHandleRaw should always be a HWND, whereas PlatformHandle might be a higher-level handle (e.g. GLFWWindow*, SDL_Window*).
     // Some backends will leave PlatformHandleRaw NULL, in which case we assume PlatformHandle will contain the HWND.
     HWND hwnd = viewport->PlatformHandleRaw ? (HWND)viewport->PlatformHandleRaw : (HWND)viewport->PlatformHandle;
     IM_ASSERT(hwnd != 0);

     ZeroMemory(&data->d3dpp, sizeof(D3DPRESENT_PARAMETERS));
     data->d3dpp.Windowed = TRUE;
     data->d3dpp.SwapEffect = D3DSWAPEFFECT_DISCARD;
     data->d3dpp.BackBufferWidth = (UINT)viewport->Size.x;
     data->d3dpp.BackBufferHeight = (UINT)viewport->Size.y;
     data->d3dpp.BackBufferFormat = D3DFMT_UNKNOWN;
     data->d3dpp.hDeviceWindow = hwnd;
     data->d3dpp.EnableAutoDepthStencil = FALSE;
     data->d3dpp.AutoDepthStencilFormat = D3DFMT_D16;
     data->d3dpp.PresentationInterval = D3DPRESENT_INTERVAL_IMMEDIATE;   // Present without vsync

     HRESULT hr = g_pd3dDevice->CreateAdditionalSwapChain(&data->d3dpp, &data->SwapChain); IM_UNUSED(hr);
     IM_ASSERT(hr == D3D_OK);
     IM_ASSERT(data->SwapChain != NULL);
 }

 static void ImGui_ImplDX9_DestroyWindow(ImGuiViewport* viewport)
 {
     // The main viewport (owned by the application) will always have RendererUserData == NULL since we didn't create the data for it.
     if (ImGuiViewportDataDx9* data = (ImGuiViewportDataDx9*)viewport->RendererUserData)
     {
         if (data->SwapChain)
             data->SwapChain->Release();
         data->SwapChain = NULL;
         ZeroMemory(&data->d3dpp, sizeof(D3DPRESENT_PARAMETERS));
         IM_DELETE(data);
     }
     viewport->RendererUserData = NULL;
 }

 static void ImGui_ImplDX9_SetWindowSize(ImGuiViewport* viewport, ImVec2 size)
 {
     ImGuiViewportDataDx9* data = (ImGuiViewportDataDx9*)viewport->RendererUserData;
     if (data->SwapChain)
     {
         data->SwapChain->Release();
         data->SwapChain = NULL;
         data->d3dpp.BackBufferWidth = (UINT)size.x;
         data->d3dpp.BackBufferHeight = (UINT)size.y;
         HRESULT hr = g_pd3dDevice->CreateAdditionalSwapChain(&data->d3dpp, &data->SwapChain); IM_UNUSED(hr);
         IM_ASSERT(hr == D3D_OK);
     }
 }

 static void ImGui_ImplDX9_RenderWindow(ImGuiViewport* viewport, void*)
 {
     ImGuiViewportDataDx9* data = (ImGuiViewportDataDx9*)viewport->RendererUserData;
     ImVec4 clear_color = ImVec4(0.0f, 0.0f, 0.0f, 1.0f);

     LPDIRECT3DSURFACE9 render_target = NULL;
     LPDIRECT3DSURFACE9 last_render_target = NULL;
     LPDIRECT3DSURFACE9 last_depth_stencil = NULL;
     data->SwapChain->GetBackBuffer(0, D3DBACKBUFFER_TYPE_MONO, &render_target);
     g_pd3dDevice->GetRenderTarget(0, &last_render_target);
     g_pd3dDevice->GetDepthStencilSurface(&last_depth_stencil);
     g_pd3dDevice->SetRenderTarget(0, render_target);
     g_pd3dDevice->SetDepthStencilSurface(NULL);

     if (!(viewport->Flags & ImGuiViewportFlags_NoRendererClear))
     {
         D3DCOLOR clear_col_dx = D3DCOLOR_RGBA((int)(clear_color.x*255.0f), (int)(clear_color.y*255.0f), (int)(clear_color.z*255.0f), (int)(clear_color.w*255.0f));
         g_pd3dDevice->Clear(0, NULL, D3DCLEAR_TARGET, clear_col_dx, 1.0f, 0);
     }

     ImGui_ImplDX9_RenderDrawData(viewport->DrawData);

     // Restore render target
     g_pd3dDevice->SetRenderTarget(0, last_render_target);
     g_pd3dDevice->SetDepthStencilSurface(last_depth_stencil);
     render_target->Release();
     last_render_target->Release();
     if (last_depth_stencil) last_depth_stencil->Release();
 }

 static void ImGui_ImplDX9_SwapBuffers(ImGuiViewport* viewport, void*)
 {
     ImGuiViewportDataDx9* data = (ImGuiViewportDataDx9*)viewport->RendererUserData;
     HRESULT hr = data->SwapChain->Present(NULL, NULL, data->d3dpp.hDeviceWindow, NULL, NULL);
     // Let main application handle D3DERR_DEVICELOST by resetting the device.
     IM_ASSERT(hr == D3D_OK || hr == D3DERR_DEVICELOST);
 }

 static void ImGui_ImplDX9_InitPlatformInterface()
 {
     ImGuiPlatformIO& platform_io = ImGui::GetPlatformIO();
     platform_io.Renderer_CreateWindow = ImGui_ImplDX9_CreateWindow;
     platform_io.Renderer_DestroyWindow = ImGui_ImplDX9_DestroyWindow;
     platform_io.Renderer_SetWindowSize = ImGui_ImplDX9_SetWindowSize;
     platform_io.Renderer_RenderWindow = ImGui_ImplDX9_RenderWindow;
     platform_io.Renderer_SwapBuffers = ImGui_ImplDX9_SwapBuffers;
 }

 static void ImGui_ImplDX9_ShutdownPlatformInterface()
 {
     ImGui::DestroyPlatformWindows();
 }

 static void ImGui_ImplDX9_CreateDeviceObjectsForPlatformWindows()
 {
     ImGuiPlatformIO& platform_io = ImGui::GetPlatformIO();
     for (int i = 1; i < platform_io.Viewports.Size; i++)
         if (!platform_io.Viewports[i]->RendererUserData)
             ImGui_ImplDX9_CreateWindow(platform_io.Viewports[i]);
 }

 static void ImGui_ImplDX9_InvalidateDeviceObjectsForPlatformWindows()
 {
     ImGuiPlatformIO& platform_io = ImGui::GetPlatformIO();
     for (int i = 1; i < platform_io.Viewports.Size; i++)
         if (platform_io.Viewports[i]->RendererUserData)
             ImGui_ImplDX9_DestroyWindow(platform_io.Viewports[i]);
 }
	// dear imgui: Renderer Backend for DirectX9
	// This needs to be used along with a Platform Backend (e.g. Win32)

	// Implemented features:
	// [X] Renderer: User texture binding. Use 'LPDIRECT3DTEXTURE9' as ImTextureID. Read the FAQ about ImTextureID!
	// [X] Renderer: Multi-viewport support. Enable with 'io.ConfigFlags \|= ImGuiConfigFlags_ViewportsEnable'.
	// [X] Renderer: Support for large meshes (64k+ vertices) with 16-bit indices.

	// You can copy and use unmodified imgui_impl_* files in your project. See examples/ folder for examples of using this.
	// If you are new to Dear ImGui, read documentation from the docs/ folder + read the top of imgui.cpp.
	// Read online: https://github.com/ocornut/imgui/tree/master/docs

	// CHANGELOG
	// (minor and older changes stripped away, please see git history for details)
	// 2020-XX-XX: Platform: Added support for multiple windows via the ImGuiPlatformIO interface.
	// 2019-05-29: DirectX9: Added support for large mesh (64K+ vertices), enable ImGuiBackendFlags_RendererHasVtxOffset flag.
	// 2019-04-30: DirectX9: Added support for special ImDrawCallback_ResetRenderState callback to reset render state.
	// 2019-03-29: Misc: Fixed erroneous assert in ImGui_ImplDX9_InvalidateDeviceObjects().
	// 2019-01-16: Misc: Disabled fog before drawing UI's. Fixes issue #2288.
	// 2018-11-30: Misc: Setting up io.BackendRendererName so it can be displayed in the About Window.
	// 2018-06-08: Misc: Extracted imgui_impl_dx9.cpp/.h away from the old combined DX9+Win32 example.
	// 2018-06-08: DirectX9: Use draw_data->DisplayPos and draw_data->DisplaySize to setup projection matrix and clipping rectangle.
	// 2018-05-07: Render: Saving/restoring Transform because they don't seem to be included in the StateBlock. Setting shading mode to Gouraud.
	// 2018-02-16: Misc: Obsoleted the io.RenderDrawListsFn callback and exposed ImGui_ImplDX9_RenderDrawData() in the .h file so you can call it yourself.
	// 2018-02-06: Misc: Removed call to ImGui::Shutdown() which is not available from 1.60 WIP, user needs to call CreateContext/DestroyContext themselves.

	#include "imgui.h"
	#include "imgui_impl_dx9.h"

	// DirectX
	#include <d3d9.h>
	#define DIRECTINPUT_VERSION 0x0800
	#include <dinput.h>

	// DirectX data
	static LPDIRECT3DDEVICE9 g_pd3dDevice = NULL;
	static LPDIRECT3DVERTEXBUFFER9 g_pVB = NULL;
	static LPDIRECT3DINDEXBUFFER9 g_pIB = NULL;
	static LPDIRECT3DTEXTURE9 g_FontTexture = NULL;
	static int g_VertexBufferSize = 5000, g_IndexBufferSize = 10000;

	struct CUSTOMVERTEX
	{
	float pos[3];
	D3DCOLOR col;
	float uv[2];
	};
	#define D3DFVF_CUSTOMVERTEX (D3DFVF_XYZ\|D3DFVF_DIFFUSE\|D3DFVF_TEX1)

	// Forward Declarations
	static void ImGui_ImplDX9_InitPlatformInterface();
	static void ImGui_ImplDX9_ShutdownPlatformInterface();
	static void ImGui_ImplDX9_CreateDeviceObjectsForPlatformWindows();
	static void ImGui_ImplDX9_InvalidateDeviceObjectsForPlatformWindows();

	static void ImGui_ImplDX9_SetupRenderState(ImDrawData* draw_data)
	{
	// Setup viewport
	D3DVIEWPORT9 vp;
	vp.X = vp.Y = 0;
	vp.Width = (DWORD)draw_data->DisplaySize.x;
	vp.Height = (DWORD)draw_data->DisplaySize.y;
	vp.MinZ = 0.0f;
	vp.MaxZ = 1.0f;
	g_pd3dDevice->SetViewport(&vp);

	// Setup render state: fixed-pipeline, alpha-blending, no face culling, no depth testing, shade mode (for gradient)
	g_pd3dDevice->SetPixelShader(NULL);
	g_pd3dDevice->SetVertexShader(NULL);
	g_pd3dDevice->SetRenderState(D3DRS_CULLMODE, D3DCULL_NONE);
	g_pd3dDevice->SetRenderState(D3DRS_LIGHTING, FALSE);
	g_pd3dDevice->SetRenderState(D3DRS_ZENABLE, FALSE);
	g_pd3dDevice->SetRenderState(D3DRS_ALPHABLENDENABLE, TRUE);
	g_pd3dDevice->SetRenderState(D3DRS_ALPHATESTENABLE, FALSE);
	g_pd3dDevice->SetRenderState(D3DRS_BLENDOP, D3DBLENDOP_ADD);
	g_pd3dDevice->SetRenderState(D3DRS_SRCBLEND, D3DBLEND_SRCALPHA);
	g_pd3dDevice->SetRenderState(D3DRS_DESTBLEND, D3DBLEND_INVSRCALPHA);
	g_pd3dDevice->SetRenderState(D3DRS_SCISSORTESTENABLE, TRUE);
	g_pd3dDevice->SetRenderState(D3DRS_SHADEMODE, D3DSHADE_GOURAUD);
	g_pd3dDevice->SetRenderState(D3DRS_FOGENABLE, FALSE);
	g_pd3dDevice->SetTextureStageState(0, D3DTSS_COLOROP, D3DTOP_MODULATE);
	g_pd3dDevice->SetTextureStageState(0, D3DTSS_COLORARG1, D3DTA_TEXTURE);
	g_pd3dDevice->SetTextureStageState(0, D3DTSS_COLORARG2, D3DTA_DIFFUSE);
	g_pd3dDevice->SetTextureStageState(0, D3DTSS_ALPHAOP, D3DTOP_MODULATE);
	g_pd3dDevice->SetTextureStageState(0, D3DTSS_ALPHAARG1, D3DTA_TEXTURE);
	g_pd3dDevice->SetTextureStageState(0, D3DTSS_ALPHAARG2, D3DTA_DIFFUSE);
	g_pd3dDevice->SetSamplerState(0, D3DSAMP_MINFILTER, D3DTEXF_LINEAR);
	g_pd3dDevice->SetSamplerState(0, D3DSAMP_MAGFILTER, D3DTEXF_LINEAR);

	// Setup orthographic projection matrix
	// Our visible imgui space lies from draw_data->DisplayPos (top left) to draw_data->DisplayPos+data_data->DisplaySize (bottom right). DisplayPos is (0,0) for single viewport apps.
	// Being agnostic of whether <d3dx9.h> or <DirectXMath.h> can be used, we aren't relying on D3DXMatrixIdentity()/D3DXMatrixOrthoOffCenterLH() or DirectX::XMMatrixIdentity()/DirectX::XMMatrixOrthographicOffCenterLH()
	{
	float L = draw_data->DisplayPos.x + 0.5f;
	float R = draw_data->DisplayPos.x + draw_data->DisplaySize.x + 0.5f;
	float T = draw_data->DisplayPos.y + 0.5f;
	float B = draw_data->DisplayPos.y + draw_data->DisplaySize.y + 0.5f;
	D3DMATRIX mat_identity = { { { 1.0f, 0.0f, 0.0f, 0.0f, 0.0f, 1.0f, 0.0f, 0.0f, 0.0f, 0.0f, 1.0f, 0.0f, 0.0f, 0.0f, 0.0f, 1.0f } } };
	D3DMATRIX mat_projection =
	{ { {
	2.0f/(R-L), 0.0f, 0.0f, 0.0f,
	0.0f, 2.0f/(T-B), 0.0f, 0.0f,
	0.0f, 0.0f, 0.5f, 0.0f,
	(L+R)/(L-R), (T+B)/(B-T), 0.5f, 1.0f
	} } };
	g_pd3dDevice->SetTransform(D3DTS_WORLD, &mat_identity);
	g_pd3dDevice->SetTransform(D3DTS_VIEW, &mat_identity);
	g_pd3dDevice->SetTransform(D3DTS_PROJECTION, &mat_projection);
	}
	}

	// Render function.
	void ImGui_ImplDX9_RenderDrawData(ImDrawData* draw_data)
	{
	// Avoid rendering when minimized
	if (draw_data->DisplaySize.x <= 0.0f \|\| draw_data->DisplaySize.y <= 0.0f)
	return;

	// Create and grow buffers if needed
	if (!g_pVB \|\| g_VertexBufferSize < draw_data->TotalVtxCount)
	{
	if (g_pVB) { g_pVB->Release(); g_pVB = NULL; }
	g_VertexBufferSize = draw_data->TotalVtxCount + 5000;
	if (g_pd3dDevice->CreateVertexBuffer(g_VertexBufferSize * sizeof(CUSTOMVERTEX), D3DUSAGE_DYNAMIC \| D3DUSAGE_WRITEONLY, D3DFVF_CUSTOMVERTEX, D3DPOOL_DEFAULT, &g_pVB, NULL) < 0)
	return;
	}
	if (!g_pIB \|\| g_IndexBufferSize < draw_data->TotalIdxCount)
	{
	if (g_pIB) { g_pIB->Release(); g_pIB = NULL; }
	g_IndexBufferSize = draw_data->TotalIdxCount + 10000;
	if (g_pd3dDevice->CreateIndexBuffer(g_IndexBufferSize * sizeof(ImDrawIdx), D3DUSAGE_DYNAMIC \| D3DUSAGE_WRITEONLY, sizeof(ImDrawIdx) == 2 ? D3DFMT_INDEX16 : D3DFMT_INDEX32, D3DPOOL_DEFAULT, &g_pIB, NULL) < 0)
	return;
	}

	// Backup the DX9 state
	IDirect3DStateBlock9* d3d9_state_block = NULL;
	if (g_pd3dDevice->CreateStateBlock(D3DSBT_ALL, &d3d9_state_block) < 0)
	return;

	// Backup the DX9 transform (DX9 documentation suggests that it is included in the StateBlock but it doesn't appear to)
	D3DMATRIX last_world, last_view, last_projection;
	g_pd3dDevice->GetTransform(D3DTS_WORLD, &last_world);
	g_pd3dDevice->GetTransform(D3DTS_VIEW, &last_view);
	g_pd3dDevice->GetTransform(D3DTS_PROJECTION, &last_projection);

	// Copy and convert all vertices into a single contiguous buffer, convert colors to DX9 default format.
	// FIXME-OPT: This is a waste of resource, the ideal is to use imconfig.h and
	// 1) to avoid repacking colors: #define IMGUI_USE_BGRA_PACKED_COLOR
	// 2) to avoid repacking vertices: #define IMGUI_OVERRIDE_DRAWVERT_STRUCT_LAYOUT struct ImDrawVert { ImVec2 pos; float z; ImU32 col; ImVec2 uv; }
	CUSTOMVERTEX* vtx_dst;
	ImDrawIdx* idx_dst;
	if (g_pVB->Lock(0, (UINT)(draw_data->TotalVtxCount * sizeof(CUSTOMVERTEX)), (void**)&vtx_dst, D3DLOCK_DISCARD) < 0)
	return;
	if (g_pIB->Lock(0, (UINT)(draw_data->TotalIdxCount * sizeof(ImDrawIdx)), (void**)&idx_dst, D3DLOCK_DISCARD) < 0)
	return;
	for (int n = 0; n < draw_data->CmdListsCount; n++)
	{
	const ImDrawList* cmd_list = draw_data->CmdLists[n];
	const ImDrawVert* vtx_src = cmd_list->VtxBuffer.Data;
	for (int i = 0; i < cmd_list->VtxBuffer.Size; i++)
	{
	vtx_dst->pos[0] = vtx_src->pos.x;
	vtx_dst->pos[1] = vtx_src->pos.y;
	vtx_dst->pos[2] = 0.0f;
	vtx_dst->col = (vtx_src->col & 0xFF00FF00) \| ((vtx_src->col & 0xFF0000) >> 16) \| ((vtx_src->col & 0xFF) << 16); // RGBA --> ARGB for DirectX9
	vtx_dst->uv[0] = vtx_src->uv.x;
	vtx_dst->uv[1] = vtx_src->uv.y;
	vtx_dst++;
	vtx_src++;
	}
	memcpy(idx_dst, cmd_list->IdxBuffer.Data, cmd_list->IdxBuffer.Size * sizeof(ImDrawIdx));
	idx_dst += cmd_list->IdxBuffer.Size;
	}
	g_pVB->Unlock();
	g_pIB->Unlock();
	g_pd3dDevice->SetStreamSource(0, g_pVB, 0, sizeof(CUSTOMVERTEX));
	g_pd3dDevice->SetIndices(g_pIB);
	g_pd3dDevice->SetFVF(D3DFVF_CUSTOMVERTEX);

	// Setup desired DX state
	ImGui_ImplDX9_SetupRenderState(draw_data);

	// Render command lists
	// (Because we merged all buffers into a single one, we maintain our own offset into them)
	int global_vtx_offset = 0;
	int global_idx_offset = 0;
	ImVec2 clip_off = draw_data->DisplayPos;
	for (int n = 0; n < draw_data->CmdListsCount; n++)
	{
	const ImDrawList* cmd_list = draw_data->CmdLists[n];
	for (int cmd_i = 0; cmd_i < cmd_list->CmdBuffer.Size; cmd_i++)
	{
	const ImDrawCmd* pcmd = &cmd_list->CmdBuffer[cmd_i];
	if (pcmd->UserCallback != NULL)
	{
	// User callback, registered via ImDrawList::AddCallback()
	// (ImDrawCallback_ResetRenderState is a special callback value used by the user to request the renderer to reset render state.)
	if (pcmd->UserCallback == ImDrawCallback_ResetRenderState)
	ImGui_ImplDX9_SetupRenderState(draw_data);
	else
	pcmd->UserCallback(cmd_list, pcmd);
	}
	else
	{
	const RECT r = { (LONG)(pcmd->ClipRect.x - clip_off.x), (LONG)(pcmd->ClipRect.y - clip_off.y), (LONG)(pcmd->ClipRect.z - clip_off.x), (LONG)(pcmd->ClipRect.w - clip_off.y) };
	const LPDIRECT3DTEXTURE9 texture = (LPDIRECT3DTEXTURE9)pcmd->TextureId;
	g_pd3dDevice->SetTexture(0, texture);
	g_pd3dDevice->SetScissorRect(&r);
	g_pd3dDevice->DrawIndexedPrimitive(D3DPT_TRIANGLELIST, pcmd->VtxOffset + global_vtx_offset, 0, (UINT)cmd_list->VtxBuffer.Size, pcmd->IdxOffset + global_idx_offset, pcmd->ElemCount / 3);
	}
	}
	global_idx_offset += cmd_list->IdxBuffer.Size;
	global_vtx_offset += cmd_list->VtxBuffer.Size;
	}

	// When using multi-viewports, it appears that there's an odd logic in DirectX9 which prevent subsequent windows
	// from rendering until the first window submits at least one draw call, even once. That's our workaround. (see #2560)
	if (global_vtx_offset == 0)
	g_pd3dDevice->DrawIndexedPrimitive(D3DPT_TRIANGLELIST, 0, 0, 0, 0, 0);

	// Restore the DX9 transform
	g_pd3dDevice->SetTransform(D3DTS_WORLD, &last_world);
	g_pd3dDevice->SetTransform(D3DTS_VIEW, &last_view);
	g_pd3dDevice->SetTransform(D3DTS_PROJECTION, &last_projection);

	// Restore the DX9 state
	d3d9_state_block->Apply();
	d3d9_state_block->Release();
	}

	bool ImGui_ImplDX9_Init(IDirect3DDevice9* device)
	{
	// Setup backend capabilities flags
	ImGuiIO& io = ImGui::GetIO();
	io.BackendRendererName = "imgui_impl_dx9";
	io.BackendFlags \|= ImGuiBackendFlags_RendererHasVtxOffset; // We can honor the ImDrawCmd::VtxOffset field, allowing for large meshes.
	io.BackendFlags \|= ImGuiBackendFlags_RendererHasViewports; // We can create multi-viewports on the Renderer side (optional)

	g_pd3dDevice = device;
	g_pd3dDevice->AddRef();

	if (io.ConfigFlags & ImGuiConfigFlags_ViewportsEnable)
	ImGui_ImplDX9_InitPlatformInterface();

	return true;
	}

	void ImGui_ImplDX9_Shutdown()
	{
	ImGui_ImplDX9_ShutdownPlatformInterface();
	ImGui_ImplDX9_InvalidateDeviceObjects();
	if (g_pd3dDevice) { g_pd3dDevice->Release(); g_pd3dDevice = NULL; }
	}

	static bool ImGui_ImplDX9_CreateFontsTexture()
	{
	// Build texture atlas
	ImGuiIO& io = ImGui::GetIO();
	unsigned char* pixels;
	int width, height, bytes_per_pixel;
	io.Fonts->GetTexDataAsRGBA32(&pixels, &width, &height, &bytes_per_pixel);

	// Upload texture to graphics system
	g_FontTexture = NULL;
	if (g_pd3dDevice->CreateTexture(width, height, 1, D3DUSAGE_DYNAMIC, D3DFMT_A8R8G8B8, D3DPOOL_DEFAULT, &g_FontTexture, NULL) < 0)
	return false;
	D3DLOCKED_RECT tex_locked_rect;
	if (g_FontTexture->LockRect(0, &tex_locked_rect, NULL, 0) != D3D_OK)
	return false;
	for (int y = 0; y < height; y++)
	memcpy((unsigned char)tex_locked_rect.pBits + tex_locked_rect.Pitch y, pixels + (width * bytes_per_pixel) * y, (width * bytes_per_pixel));
	g_FontTexture->UnlockRect(0);

	// Store our identifier
	io.Fonts->TexID = (ImTextureID)g_FontTexture;

	return true;
	}

	bool ImGui_ImplDX9_CreateDeviceObjects()
	{
	if (!g_pd3dDevice)
	return false;
	if (!ImGui_ImplDX9_CreateFontsTexture())
	return false;
	ImGui_ImplDX9_CreateDeviceObjectsForPlatformWindows();
	return true;
	}

	void ImGui_ImplDX9_InvalidateDeviceObjects()
	{
	if (!g_pd3dDevice)
	return;
	if (g_pVB) { g_pVB->Release(); g_pVB = NULL; }
	if (g_pIB) { g_pIB->Release(); g_pIB = NULL; }
	if (g_FontTexture) { g_FontTexture->Release(); g_FontTexture = NULL; ImGui::GetIO().Fonts->TexID = NULL; } // We copied g_pFontTextureView to io.Fonts->TexID so let's clear that as well.
	ImGui_ImplDX9_InvalidateDeviceObjectsForPlatformWindows();
	}

	void ImGui_ImplDX9_NewFrame()
	{
	if (!g_FontTexture)
	ImGui_ImplDX9_CreateDeviceObjects();
	}

	//--------------------------------------------------------------------------------------------------------
	// MULTI-VIEWPORT / PLATFORM INTERFACE SUPPORT
	// This is an _advanced_ and _optional_ feature, allowing the backend to create and handle multiple viewports simultaneously.
	// If you are new to dear imgui or creating a new binding for dear imgui, it is recommended that you completely ignore this section first..
	//--------------------------------------------------------------------------------------------------------

	// Helper structure we store in the void* RenderUserData field of each ImGuiViewport to easily retrieve our backend data.
	struct ImGuiViewportDataDx9
	{
	IDirect3DSwapChain9* SwapChain;
	D3DPRESENT_PARAMETERS d3dpp;

	ImGuiViewportDataDx9() { SwapChain = NULL; ZeroMemory(&d3dpp, sizeof(D3DPRESENT_PARAMETERS)); }
	~ImGuiViewportDataDx9() { IM_ASSERT(SwapChain == NULL); }
	};

	static void ImGui_ImplDX9_CreateWindow(ImGuiViewport* viewport)
	{
	ImGuiViewportDataDx9* data = IM_NEW(ImGuiViewportDataDx9)();
	viewport->RendererUserData = data;

	// PlatformHandleRaw should always be a HWND, whereas PlatformHandle might be a higher-level handle (e.g. GLFWWindow, SDL_Window).
	// Some backends will leave PlatformHandleRaw NULL, in which case we assume PlatformHandle will contain the HWND.
	HWND hwnd = viewport->PlatformHandleRaw ? (HWND)viewport->PlatformHandleRaw : (HWND)viewport->PlatformHandle;
	IM_ASSERT(hwnd != 0);

	ZeroMemory(&data->d3dpp, sizeof(D3DPRESENT_PARAMETERS));
	data->d3dpp.Windowed = TRUE;
	data->d3dpp.SwapEffect = D3DSWAPEFFECT_DISCARD;
	data->d3dpp.BackBufferWidth = (UINT)viewport->Size.x;
	data->d3dpp.BackBufferHeight = (UINT)viewport->Size.y;
	data->d3dpp.BackBufferFormat = D3DFMT_UNKNOWN;
	data->d3dpp.hDeviceWindow = hwnd;
	data->d3dpp.EnableAutoDepthStencil = FALSE;
	data->d3dpp.AutoDepthStencilFormat = D3DFMT_D16;
	data->d3dpp.PresentationInterval = D3DPRESENT_INTERVAL_IMMEDIATE; // Present without vsync

	HRESULT hr = g_pd3dDevice->CreateAdditionalSwapChain(&data->d3dpp, &data->SwapChain); IM_UNUSED(hr);
	IM_ASSERT(hr == D3D_OK);
	IM_ASSERT(data->SwapChain != NULL);
	}

	static void ImGui_ImplDX9_DestroyWindow(ImGuiViewport* viewport)
	{
	// The main viewport (owned by the application) will always have RendererUserData == NULL since we didn't create the data for it.
	if (ImGuiViewportDataDx9* data = (ImGuiViewportDataDx9*)viewport->RendererUserData)
	{
	if (data->SwapChain)
	data->SwapChain->Release();
	data->SwapChain = NULL;
	ZeroMemory(&data->d3dpp, sizeof(D3DPRESENT_PARAMETERS));
	IM_DELETE(data);
	}
	viewport->RendererUserData = NULL;
	}

	static void ImGui_ImplDX9_SetWindowSize(ImGuiViewport* viewport, ImVec2 size)
	{
	ImGuiViewportDataDx9* data = (ImGuiViewportDataDx9*)viewport->RendererUserData;
	if (data->SwapChain)
	{
	data->SwapChain->Release();
	data->SwapChain = NULL;
	data->d3dpp.BackBufferWidth = (UINT)size.x;
	data->d3dpp.BackBufferHeight = (UINT)size.y;
	HRESULT hr = g_pd3dDevice->CreateAdditionalSwapChain(&data->d3dpp, &data->SwapChain); IM_UNUSED(hr);
	IM_ASSERT(hr == D3D_OK);
	}
	}

	static void ImGui_ImplDX9_RenderWindow(ImGuiViewport* viewport, void*)
	{
	ImGuiViewportDataDx9* data = (ImGuiViewportDataDx9*)viewport->RendererUserData;
	ImVec4 clear_color = ImVec4(0.0f, 0.0f, 0.0f, 1.0f);

	LPDIRECT3DSURFACE9 render_target = NULL;
	LPDIRECT3DSURFACE9 last_render_target = NULL;
	LPDIRECT3DSURFACE9 last_depth_stencil = NULL;
	data->SwapChain->GetBackBuffer(0, D3DBACKBUFFER_TYPE_MONO, &render_target);
	g_pd3dDevice->GetRenderTarget(0, &last_render_target);
	g_pd3dDevice->GetDepthStencilSurface(&last_depth_stencil);
	g_pd3dDevice->SetRenderTarget(0, render_target);
	g_pd3dDevice->SetDepthStencilSurface(NULL);

	if (!(viewport->Flags & ImGuiViewportFlags_NoRendererClear))
	{
	D3DCOLOR clear_col_dx = D3DCOLOR_RGBA((int)(clear_color.x255.0f), (int)(clear_color.y255.0f), (int)(clear_color.z255.0f), (int)(clear_color.w255.0f));
	g_pd3dDevice->Clear(0, NULL, D3DCLEAR_TARGET, clear_col_dx, 1.0f, 0);
	}

	ImGui_ImplDX9_RenderDrawData(viewport->DrawData);

	// Restore render target
	g_pd3dDevice->SetRenderTarget(0, last_render_target);
	g_pd3dDevice->SetDepthStencilSurface(last_depth_stencil);
	render_target->Release();
	last_render_target->Release();
	if (last_depth_stencil) last_depth_stencil->Release();
	}

	static void ImGui_ImplDX9_SwapBuffers(ImGuiViewport* viewport, void*)
	{
	ImGuiViewportDataDx9* data = (ImGuiViewportDataDx9*)viewport->RendererUserData;
	HRESULT hr = data->SwapChain->Present(NULL, NULL, data->d3dpp.hDeviceWindow, NULL, NULL);
	// Let main application handle D3DERR_DEVICELOST by resetting the device.
	IM_ASSERT(hr == D3D_OK \|\| hr == D3DERR_DEVICELOST);
	}

	static void ImGui_ImplDX9_InitPlatformInterface()
	{
	ImGuiPlatformIO& platform_io = ImGui::GetPlatformIO();
	platform_io.Renderer_CreateWindow = ImGui_ImplDX9_CreateWindow;
	platform_io.Renderer_DestroyWindow = ImGui_ImplDX9_DestroyWindow;
	platform_io.Renderer_SetWindowSize = ImGui_ImplDX9_SetWindowSize;
	platform_io.Renderer_RenderWindow = ImGui_ImplDX9_RenderWindow;
	platform_io.Renderer_SwapBuffers = ImGui_ImplDX9_SwapBuffers;
	}

	static void ImGui_ImplDX9_ShutdownPlatformInterface()
	{
	ImGui::DestroyPlatformWindows();
	}

	static void ImGui_ImplDX9_CreateDeviceObjectsForPlatformWindows()
	{
	ImGuiPlatformIO& platform_io = ImGui::GetPlatformIO();
	for (int i = 1; i < platform_io.Viewports.Size; i++)
	if (!platform_io.Viewports[i]->RendererUserData)
	ImGui_ImplDX9_CreateWindow(platform_io.Viewports[i]);
	}

	static void ImGui_ImplDX9_InvalidateDeviceObjectsForPlatformWindows()
	{
	ImGuiPlatformIO& platform_io = ImGui::GetPlatformIO();
	for (int i = 1; i < platform_io.Viewports.Size; i++)
	if (platform_io.Viewports[i]->RendererUserData)
	ImGui_ImplDX9_DestroyWindow(platform_io.Viewports[i]);
	}