diff --git a/CMakeLists.txt b/CMakeLists.txt
index df850c42b..addd4ed68 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -971,17 +971,17 @@ if (WITH_RENDER_DX11)
   endif()
 endif()
 
-#if (WITH_RENDER_DX9)
-#  if (WIN32)
-#    list(APPEND GUI_SOURCES src/gui/render/renderDX9.cpp)
-#    list(APPEND GUI_SOURCES extern/imgui_patched/backends/imgui_impl_dx9.cpp)
-#    list(APPEND DEPENDENCIES_DEFINES HAVE_RENDER_DX9)
-#    list(APPEND DEPENDENCIES_LIBRARIES d3d9)
-#    message(STATUS "UI render backend: DirectX 9")
-#  else()
-#    message(FATAL_ERROR "DirectX 9 render backend only for Windows!")
-#  endif()
-#endif()
+if (WITH_RENDER_DX9)
+  if (WIN32)
+    list(APPEND GUI_SOURCES src/gui/render/renderDX9.cpp)
+    list(APPEND GUI_SOURCES extern/imgui_patched/backends/imgui_impl_dx9.cpp)
+    list(APPEND DEPENDENCIES_DEFINES HAVE_RENDER_DX9)
+    list(APPEND DEPENDENCIES_LIBRARIES d3d9)
+    message(STATUS "UI render backend: DirectX 9")
+  else()
+    message(FATAL_ERROR "DirectX 9 render backend only for Windows!")
+  endif()
+endif()
 
 if (WITH_RENDER_METAL)
   if (APPLE)
diff --git a/src/gui/render.cpp b/src/gui/render.cpp
index 81dcc2dc2..8db99c025 100644
--- a/src/gui/render.cpp
+++ b/src/gui/render.cpp
@@ -31,6 +31,9 @@
 #ifdef HAVE_RENDER_DX11
 #include "render/renderDX11.h"
 #endif
+#ifdef HAVE_RENDER_DX9
+#include "render/renderDX9.h"
+#endif
 #ifdef HAVE_RENDER_METAL
 #include "render/renderMetal.h"
 #endif
diff --git a/src/gui/render/renderDX9.cpp b/src/gui/render/renderDX9.cpp
new file mode 100644
index 000000000..9fd65bd4d
--- /dev/null
+++ b/src/gui/render/renderDX9.cpp
@@ -0,0 +1,295 @@
+/**
+ * Furnace Tracker - multi-system chiptune tracker
+ * Copyright (C) 2021-2024 tildearrow and contributors
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#define INCLUDE_D3D9
+#include "renderDX9.h"
+#include <SDL_syswm.h>
+#include "backends/imgui_impl_dx9.h"
+#include "../../ta-log.h"
+#include "../../utfutils.h"
+
+class FurnaceDX9Texture: public FurnaceGUITexture {
+  public:
+  ID3D11Texture2D* tex;
+  ID3D11ShaderResourceView* view;
+  int width, height;
+  unsigned char* lockedData;
+  bool dynamic;
+  FurnaceDX9Texture():
+    tex(NULL),
+    view(NULL),
+    width(0),
+    height(0),
+    lockedData(NULL),
+    dynamic(false) {}
+};
+
+bool FurnaceGUIRenderDX9::destroyRenderTarget() {
+  if (renderTarget!=NULL) {
+    renderTarget->Release();
+    renderTarget=NULL;
+    return true;
+  }
+  return false;
+}
+
+bool FurnaceGUIRenderDX9::createRenderTarget() {
+  ID3D11Texture2D* screen=NULL;
+  HRESULT result;
+
+  destroyRenderTarget();
+
+  if (swapchain==NULL || device==NULL) {
+    logW("createRenderTarget: swapchain or device are NULL!");
+    return false;
+  }
+
+  DXGI_SWAP_CHAIN_DESC chainDesc;
+  memset(&chainDesc,0,sizeof(chainDesc));
+  if (swapchain->GetDesc(&chainDesc)!=S_OK) {
+    logW("createRenderTarget: could not get swapchain desc!");
+  } else {
+    outW=chainDesc.BufferDesc.Width;
+    outH=chainDesc.BufferDesc.Height;
+    logI("DX9: buffer desc sizes: %d, %d",chainDesc.BufferDesc.Width,chainDesc.BufferDesc.Height);
+  }
+
+  result=swapchain->GetBuffer(0,IID_PPV_ARGS(&screen));
+  if (result!=S_OK) {
+    logW("createRenderTarget: could not get buffer! %.8x",result);
+    return false;
+  }
+  if (screen==NULL) {
+    logW("createRenderTarget: screen is null!");
+    return false;
+  }
+
+  result=device->CreateRenderTargetView(screen,NULL,&renderTarget);
+  if (result!=S_OK) {
+    logW("createRenderTarget: could not create render target view! %.8x",result);
+    screen->Release();
+    return false;
+  }
+  if (renderTarget==NULL) {
+    logW("createRenderTarget: what the hell the render target is null?");
+    screen->Release();
+    return false;
+  }
+
+  screen->Release();
+  return true;
+}
+
+ImTextureID FurnaceGUIRenderDX9::getTextureID(FurnaceGUITexture* which) {
+  FurnaceDX9Texture* t=(FurnaceDX9Texture*)which;
+  return (ImTextureID)t->view;
+}
+
+bool FurnaceGUIRenderDX9::lockTexture(FurnaceGUITexture* which, void** data, int* pitch) {
+  FurnaceDX9Texture* t=(FurnaceDX9Texture*)which;
+  if (t->lockedData!=NULL) return false;
+
+  D3D11_MAPPED_SUBRESOURCE mappedRes;
+  memset(&mappedRes,0,sizeof(mappedRes));
+
+  HRESULT result=context->Map(t->tex,D3D11CalcSubresource(0,0,1),D3D11_MAP_WRITE_DISCARD,0,&mappedRes);
+  if (result!=S_OK) {
+    logW("could not map texture! %.8x",result);
+    return false;
+  }
+  t->lockedData=(unsigned char*)mappedRes.pData;
+  *data=mappedRes.pData;
+  *pitch=mappedRes.RowPitch;
+
+  logV("texture locked... pitch: %d",mappedRes.RowPitch);
+  return true;
+}
+
+bool FurnaceGUIRenderDX9::unlockTexture(FurnaceGUITexture* which) {
+  FurnaceDX9Texture* t=(FurnaceDX9Texture*)which;
+  if (t->lockedData==NULL) return false;
+  context->Unmap(t->tex,D3D11CalcSubresource(0,0,1));
+  t->lockedData=NULL;
+  return true;
+}
+
+bool FurnaceGUIRenderDX9::updateTexture(FurnaceGUITexture* which, void* data, int pitch) {
+  FurnaceDX9Texture* t=(FurnaceDX9Texture*)which;
+  if (t->dynamic) {
+    unsigned char* d=NULL;
+    int p=0;
+    if (!lockTexture(t,(void**)&d,&p)) return false;
+    if (p==pitch) {
+      memcpy(d,data,p*t->height);
+    } else {
+      unsigned char* ucData=(unsigned char*)data;
+      int srcPos=0;
+      int destPos=0;
+      for (int i=0; i<t->height; i++) {
+        memcpy(&d[destPos],&ucData[srcPos],pitch);
+        srcPos+=pitch;
+        destPos+=p;
+      }
+    }
+    unlockTexture(t);
+  } else {
+    context->UpdateSubresource(t->tex,D3D11CalcSubresource(0,0,1),NULL,data,pitch,pitch*t->height);
+  }
+  return true;
+}
+
+FurnaceGUITexture* FurnaceGUIRenderDX9::createTexture(bool dynamic, int width, int height, bool interpolate) {
+  return ret;
+}
+
+bool FurnaceGUIRenderDX9::destroyTexture(FurnaceGUITexture* which) {
+  FurnaceDX9Texture* t=(FurnaceDX9Texture*)which;
+  delete t;
+  return true;
+}
+
+void FurnaceGUIRenderDX9::setTextureBlendMode(FurnaceGUITexture* which, FurnaceGUIBlendMode mode) {
+}
+
+void FurnaceGUIRenderDX9::setBlendMode(FurnaceGUIBlendMode mode) {
+}
+
+void FurnaceGUIRenderDX9::resized(const SDL_Event& ev) {
+  destroyRenderTarget();
+  logI("DX9: resizing buffers");
+  HRESULT result=swapchain->ResizeBuffers(0,(unsigned int)ev.window.data1,(unsigned int)ev.window.data2,DXGI_FORMAT_UNKNOWN,DXGI_SWAP_CHAIN_FLAG_ALLOW_MODE_SWITCH);
+  if (result!=S_OK) {
+    if (result==DXGI_ERROR_DEVICE_REMOVED || result==DXGI_ERROR_DEVICE_RESET) {
+      dead=true;
+    }
+    logW("error while resizing swapchain buffers! %.8x",result);
+  }
+  if (!dead) {
+    createRenderTarget();
+  }
+}
+
+void FurnaceGUIRenderDX9::clear(ImVec4 color) {
+  float floatColor[4]={
+    color.x*color.w,
+    color.y*color.w,
+    color.z*color.w,
+    color.w,
+  };
+
+  context->OMSetRenderTargets(1,&renderTarget,NULL);
+  context->ClearRenderTargetView(renderTarget,floatColor);
+}
+
+bool FurnaceGUIRenderDX9::newFrame() {
+  return ImGui_ImplDX9_NewFrame();
+}
+
+bool FurnaceGUIRenderDX9::canVSync() {
+  // TODO: find out how to retrieve VSync status
+  return true;
+}
+
+void FurnaceGUIRenderDX9::createFontsTexture() {
+  ImGui_ImplDX9_CreateDeviceObjects();
+}
+
+void FurnaceGUIRenderDX9::destroyFontsTexture() {
+  ImGui_ImplDX9_InvalidateDeviceObjects();
+}
+
+void FurnaceGUIRenderDX9::renderGUI() {
+  ImGui_ImplDX9_RenderDrawData(ImGui::GetDrawData());
+}
+
+void FurnaceGUIRenderDX9::wipe(float alpha) {
+}
+
+bool FurnaceGUIRenderDX9::getOutputSize(int& w, int& h) {
+  w=outW;
+  h=outH;
+  return true;
+}
+
+int FurnaceGUIRenderDX9::getWindowFlags() {
+  return 0;
+}
+
+int FurnaceGUIRenderDX9::getMaxTextureWidth() {
+  return maxWidth;
+}
+
+int FurnaceGUIRenderDX9::getMaxTextureHeight() {
+  return maxHeight;
+}
+
+const char* FurnaceGUIRenderDX9::getBackendName() {
+  return "DirectX 9";
+}
+
+const char* FurnaceGUIRenderDX9::getVendorName() {
+  return vendorName.c_str();
+}
+
+const char* FurnaceGUIRenderDX9::getDeviceName() {
+  return deviceName.c_str();
+}
+
+const char* FurnaceGUIRenderDX9::getAPIVersion() {
+  return apiVersion.c_str();
+}
+
+void FurnaceGUIRenderDX9::setSwapInterval(int swapInt) {
+  swapInterval=swapInt;
+}
+
+void FurnaceGUIRenderDX9::preInit() {
+}
+
+bool FurnaceGUIRenderDX9::init(SDL_Window* win, int swapInt) {
+  SDL_SysWMinfo sysWindow;
+  D3D_FEATURE_LEVEL featureLevel;
+
+  SDL_VERSION(&sysWindow.version);
+  if (SDL_GetWindowWMInfo(win,&sysWindow)==SDL_FALSE) {
+    logE("could not get window WM info! %s",SDL_GetError());
+    return false;
+  }
+  HWND window=(HWND)sysWindow.info.win.window;
+
+  return true;
+}
+
+void FurnaceGUIRenderDX9::initGUI(SDL_Window* win) {
+  ImGui_ImplSDL2_InitForD3D(win);
+  ImGui_ImplDX9_Init(device,context);
+}
+
+bool FurnaceGUIRenderDX9::quit() {
+  dead=false;
+  return true;
+}
+
+void FurnaceGUIRenderDX9::quitGUI() { 
+  ImGui_ImplDX9_Shutdown();
+}
+
+bool FurnaceGUIRenderDX9::isDead() {
+  return dead;
+}
diff --git a/src/gui/render/renderDX9.h b/src/gui/render/renderDX9.h
new file mode 100644
index 000000000..9bdfdf177
--- /dev/null
+++ b/src/gui/render/renderDX9.h
@@ -0,0 +1,82 @@
+/**
+ * Furnace Tracker - multi-system chiptune tracker
+ * Copyright (C) 2021-2024 tildearrow and contributors
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include "../gui.h"
+#ifdef INCLUDE_D3D9
+#include <d3d9.h>
+#else
+
+#endif
+
+class FurnaceGUIRenderDX9: public FurnaceGUIRender {
+  IDirect3DDevice9* device;
+
+  int outW, outH, swapInterval;
+
+  bool dead, haveScene;
+
+  // SHADERS //
+
+  int maxWidth, maxHeight;
+  String vendorName, deviceName, apiVersion;
+
+  public:
+    ImTextureID getTextureID(FurnaceGUITexture* which);
+    bool lockTexture(FurnaceGUITexture* which, void** data, int* pitch);
+    bool unlockTexture(FurnaceGUITexture* which);
+    bool updateTexture(FurnaceGUITexture* which, void* data, int pitch);
+    FurnaceGUITexture* createTexture(bool dynamic, int width, int height, bool interpolate=true);
+    bool destroyTexture(FurnaceGUITexture* which);
+    void setTextureBlendMode(FurnaceGUITexture* which, FurnaceGUIBlendMode mode);
+    void setBlendMode(FurnaceGUIBlendMode mode);
+    void resized(const SDL_Event& ev);
+    void clear(ImVec4 color);
+    bool newFrame();
+    bool canVSync();
+    void createFontsTexture();
+    void destroyFontsTexture();
+    void renderGUI();
+    void wipe(float alpha);
+    void present();
+    bool getOutputSize(int& w, int& h);
+    int getWindowFlags();
+    int getMaxTextureWidth();
+    int getMaxTextureHeight();
+    const char* getBackendName();
+    const char* getVendorName();
+    const char* getDeviceName();
+    const char* getAPIVersion();
+    void setSwapInterval(int swapInterval);
+    void preInit();
+    bool init(SDL_Window* win, int swapInterval);
+    void initGUI(SDL_Window* win);
+    void quitGUI();
+    bool quit();
+    bool isDead();
+    FurnaceGUIRenderDX9():
+      device(NULL),
+      outW(0),
+      outH(0),
+      swapInterval(1),
+      dead(false),
+      haveScene(false),
+      maxWidth(8192),
+      maxHeight(8192) {
+    }
+};