GUI: render backend recovery, part 1

src/gui/debugWindow.cpp

@@ -536,6 +536,9 @@ void FurnaceGUI::drawDebug() {
       if (ImGui::Button("Spoiler")) {
         spoilerOpen=!spoilerOpen;
       }
+      if (ImGui::Button("Kill Graphics")) {
+        killGraphics=true;
+      }
       ImGui::TreePop();
     }
     if (ImGui::TreeNode("Performance")) {

src/gui/gui.cpp

@@ -3776,6 +3776,79 @@ bool FurnaceGUI::loop() {
       });
     }
 
+    // recover from dead graphics
+    if (rend->isDead() || killGraphics) {
+      killGraphics=false;
+
+      logW("graphics are dead! restarting...");
+      
+      if (sampleTex!=NULL) {
+        rend->destroyTexture(sampleTex);
+        sampleTex=NULL;
+      }
+
+      if (chanOscGradTex!=NULL) {
+        rend->destroyTexture(chanOscGradTex);
+        chanOscGradTex=NULL;
+      }
+
+      for (auto& i: images) {
+        if (i.second->tex!=NULL) {
+          rend->destroyTexture(i.second->tex);
+          i.second->tex=NULL;
+        }
+      }
+
+      commitState();
+      rend->quitGUI();
+      rend->quit();
+      ImGui_ImplSDL2_Shutdown();
+
+      int initAttempts=0;
+
+      SDL_Delay(500);
+
+      logD("starting render backend...");
+      while (++initAttempts<=5) {
+        if (rend->init(sdlWin)) {
+          break;
+        }
+        SDL_Delay(1000);
+        logV("trying again...");
+      }
+
+      if (initAttempts>5) {
+        reportError("can't keep going without graphics! Furnace will quit now.");
+        quit=true;
+        break;
+      }
+
+      rend->clear(ImVec4(0.0,0.0,0.0,1.0));
+      rend->present();
+
+      logD("preparing user interface...");
+      rend->initGUI(sdlWin);
+
+      logD("building font...");
+      if (!ImGui::GetIO().Fonts->Build()) {
+        logE("error while building font atlas!");
+        showError("error while loading fonts! please check your settings.");
+        ImGui::GetIO().Fonts->Clear();
+        mainFont=ImGui::GetIO().Fonts->AddFontDefault();
+        patFont=mainFont;
+        if (rend) rend->destroyFontsTexture();
+        if (!ImGui::GetIO().Fonts->Build()) {
+          logE("error again while building font atlas!");
+        }
+      }
+
+      firstFrame=true;
+      mustClear=2;
+      initialScreenWipe=1.0f;
+
+      continue;
+    }
+
     bool fontsFailed=false;
 
     layoutTimeBegin=SDL_GetPerformanceCounter();
@@ -6319,6 +6392,8 @@ bool FurnaceGUI::init() {
   rend->present();
 
   logD("preparing user interface...");
+  IMGUI_CHECKVERSION();
+  ImGui::CreateContext();
   rend->initGUI(sdlWin);
 
   applyUISettings();
@@ -6556,8 +6631,8 @@ bool FurnaceGUI::finish() {
   commitState();
   rend->quitGUI();
   ImGui_ImplSDL2_Shutdown();
-  ImGui::DestroyContext();
   quitRender();
+  ImGui::DestroyContext();
   SDL_DestroyWindow(sdlWin);
 
   if (vibrator) {
@@ -6617,6 +6692,7 @@ FurnaceGUI::FurnaceGUI():
   modTableHex(false),
   displayEditString(false),
   mobileEdit(false),
+  killGraphics(false),
   vgmExportVersion(0x171),
   vgmExportTrailingTicks(-1),
   drawHalt(10),

src/gui/gui.h

@@ -1210,9 +1210,12 @@ struct FurnaceGUIQueryResult {
   }
 };
 
+class FurnaceGUITexture {
+};
+
 struct FurnaceGUIImage {
   unsigned char* data;
-  void* tex;
+  FurnaceGUITexture* tex;
   int width, height, ch;
 
   FurnaceGUIImage():
@@ -1243,13 +1246,13 @@ enum FurnaceGUIBlendMode {
 
 class FurnaceGUIRender {
   public:
-    virtual ImTextureID getTextureID(void* which);
+    virtual ImTextureID getTextureID(FurnaceGUITexture* which);
-    virtual bool lockTexture(void* which, void** data, int* pitch);
+    virtual bool lockTexture(FurnaceGUITexture* which, void** data, int* pitch);
-    virtual bool unlockTexture(void* which);
+    virtual bool unlockTexture(FurnaceGUITexture* which);
-    virtual bool updateTexture(void* which, void* data, int pitch);
+    virtual bool updateTexture(FurnaceGUITexture* which, void* data, int pitch);
-    virtual void* createTexture(bool dynamic, int width, int height);
+    virtual FurnaceGUITexture* createTexture(bool dynamic, int width, int height);
-    virtual bool destroyTexture(void* which);
+    virtual bool destroyTexture(FurnaceGUITexture* which);
-    virtual void setTextureBlendMode(void* which, FurnaceGUIBlendMode mode);
+    virtual void setTextureBlendMode(FurnaceGUITexture* which, FurnaceGUIBlendMode mode);
     virtual void setBlendMode(FurnaceGUIBlendMode mode);
     virtual void resized(const SDL_Event& ev);
     virtual void clear(ImVec4 color);
@@ -1280,7 +1283,7 @@ class FurnaceGUI {
   SDL_Haptic* vibrator;
   bool vibratorAvailable;
   
-  void* sampleTex;
+  FurnaceGUITexture* sampleTex;
   int sampleTexW, sampleTexH;
   bool updateSampleTex;
 
@@ -1305,6 +1308,7 @@ class FurnaceGUI {
   bool displayNew, fullScreen, preserveChanPos, wantScrollList, noteInputPoly;
   bool displayPendingIns, pendingInsSingle, displayPendingRawSample, snesFilterHex, modTableHex, displayEditString;
   bool mobileEdit;
+  bool killGraphics;
   bool willExport[DIV_MAX_CHIPS];
   int vgmExportVersion;
   int vgmExportTrailingTicks;
@@ -1960,7 +1964,7 @@ class FurnaceGUI {
   String chanOscTextFormat;
   ImVec4 chanOscColor, chanOscTextColor;
   Gradient2D chanOscGrad;
-  void* chanOscGradTex;
+  FurnaceGUITexture* chanOscGradTex;
   float chanOscLP0[DIV_MAX_CHANS];
   float chanOscLP1[DIV_MAX_CHANS];
   float chanOscVol[DIV_MAX_CHANS];
@@ -2121,7 +2125,7 @@ class FurnaceGUI {
   void highlightWindow(const char* winName);
 
   FurnaceGUIImage* getImage(FurnaceGUIImages image);
-  void* getTexture(FurnaceGUIImages image, FurnaceGUIBlendMode blendMode=GUI_BLEND_MODE_BLEND);
+  FurnaceGUITexture* getTexture(FurnaceGUIImages image, FurnaceGUIBlendMode blendMode=GUI_BLEND_MODE_BLEND);
   void drawImage(ImDrawList* dl, FurnaceGUIImages image, const ImVec2& pos, const ImVec2& scale, double rotate, const ImVec2& uvMin, const ImVec2& uvMax, const ImVec4& imgColor);
 
   void drawMobileControls();

src/gui/image.cpp

@@ -46,7 +46,7 @@ const unsigned int imageLen[GUI_IMAGE_MAX]={
   image_pat_size
 };
 
-void* FurnaceGUI::getTexture(FurnaceGUIImages image, FurnaceGUIBlendMode blendMode) {
+FurnaceGUITexture* FurnaceGUI::getTexture(FurnaceGUIImages image, FurnaceGUIBlendMode blendMode) {
   FurnaceGUIImage* img=getImage(image);
 
   if (img==NULL) return NULL;

src/gui/intro.cpp

@@ -25,7 +25,7 @@
 
 void FurnaceGUI::drawImage(ImDrawList* dl, FurnaceGUIImages image, const ImVec2& pos, const ImVec2& scale, double rotate, const ImVec2& uvMin, const ImVec2& uvMax, const ImVec4& imgColor) {
   FurnaceGUIImage* imgI=getImage(image);
-  void* img=getTexture(image);
+  FurnaceGUITexture* img=getTexture(image);
 
   float squareSize=MAX(introMax.x-introMin.x,introMax.y-introMin.y);
   float uDiff=uvMax.x-uvMin.x;

src/gui/render/abstract.cpp

@@ -19,31 +19,31 @@
 
 #include "../gui.h"
 
-ImTextureID FurnaceGUIRender::getTextureID(void* which) {
+ImTextureID FurnaceGUIRender::getTextureID(FurnaceGUITexture* which) {
   return NULL;
 }
 
-bool FurnaceGUIRender::lockTexture(void* which, void** data, int* pitch) {
+bool FurnaceGUIRender::lockTexture(FurnaceGUITexture* which, void** data, int* pitch) {
   return false;
 }
 
-bool FurnaceGUIRender::unlockTexture(void* which) {
+bool FurnaceGUIRender::unlockTexture(FurnaceGUITexture* which) {
   return false;
 }
 
-bool FurnaceGUIRender::updateTexture(void* which, void* data, int pitch) {
+bool FurnaceGUIRender::updateTexture(FurnaceGUITexture* which, void* data, int pitch) {
   return false;
 }
 
-void* FurnaceGUIRender::createTexture(bool dynamic, int width, int height) {
+FurnaceGUITexture* FurnaceGUIRender::createTexture(bool dynamic, int width, int height) {
   return NULL;
 }
 
-bool FurnaceGUIRender::destroyTexture(void* which) {
+bool FurnaceGUIRender::destroyTexture(FurnaceGUITexture* which) {
   return false;
 }
 
-void FurnaceGUIRender::setTextureBlendMode(void* which, FurnaceGUIBlendMode mode) {
+void FurnaceGUIRender::setTextureBlendMode(FurnaceGUITexture* which, FurnaceGUIBlendMode mode) {
 }
 
 void FurnaceGUIRender::setBlendMode(FurnaceGUIBlendMode mode) {

src/gui/render/renderDX11.cpp

@@ -69,7 +69,8 @@ const D3D_FEATURE_LEVEL possibleFeatureLevels[2]={
   D3D_FEATURE_LEVEL_10_0
 };
 
-struct FurnaceDXTexture {
+class FurnaceDXTexture: public FurnaceGUITexture {
+  public:
   ID3D11Texture2D* tex;
   ID3D11ShaderResourceView* view;
   int width, height;
@@ -244,7 +245,6 @@ void* FurnaceGUIRenderDX11::createTexture(bool dynamic, int width, int height) {
   ret->tex=tex;
   ret->view=view;
   ret->dynamic=dynamic;
-  textures.push_back(ret);
   return ret;
 }
 
@@ -253,13 +253,6 @@ bool FurnaceGUIRenderDX11::destroyTexture(void* which) {
   t->view->Release();
   t->tex->Release();
   delete t;
-
-  for (size_t i=0; i<textures.size(); i++) {
-    if (textures[i]==t) {
-      textures.erase(textures.begin()+i);
-      break;
-    }
-  }
   return true;
 }
 
@@ -274,10 +267,15 @@ void FurnaceGUIRenderDX11::resized(const SDL_Event& ev) {
   logI("DX11: 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 FurnaceGUIRenderDX11::clear(ImVec4 color) {
   float floatColor[4]={
@@ -348,7 +346,12 @@ void FurnaceGUIRenderDX11::wipe(float alpha) {
 }
 
 void FurnaceGUIRenderDX11::present() {
-  swapchain->Present(1,0);
+  HRESULT result=swapchain->Present(1,0);
+  if (result==DXGI_ERROR_DEVICE_REMOVED || result==DXGI_ERROR_DEVICE_RESET) {
+    dead=true;
+  } else {
+    logE("DX11: present failed! %.8x",result)
+  }
 }
 
 bool FurnaceGUIRenderDX11::getOutputSize(int& w, int& h) {
@@ -534,9 +537,6 @@ bool FurnaceGUIRenderDX11::init(SDL_Window* win) {
 }
 
 void FurnaceGUIRenderDX11::initGUI(SDL_Window* win) {
-  IMGUI_CHECKVERSION();
-  ImGui::CreateContext();
-
   ImGui_ImplSDL2_InitForD3D(win);
   ImGui_ImplDX11_Init(device,context);
 }
@@ -544,13 +544,6 @@ void FurnaceGUIRenderDX11::initGUI(SDL_Window* win) {
 bool FurnaceGUIRenderDX11::quit() {
   destroyRenderTarget();
 
-  for (FurnaceDXTexture* i: textures) {
-    i->view->Release();
-    i->tex->Release();
-    delete i;
-  }
-  textures.clear();
-
   if (swapchain!=NULL) {
     swapchain->Release();
     swapchain=NULL;
@@ -563,9 +556,15 @@ bool FurnaceGUIRenderDX11::quit() {
     device->Release();
     device=NULL;
   }
+
+  dead=false;
   return true;
 }
 
 void FurnaceGUIRenderDX11::quitGUI() { 
   ImGui_ImplDX11_Shutdown();
 }
+
+void FurnaceGUIRenderDX11::isDead() {
+  return dead;
+}

src/gui/render/renderDX11.h

@@ -32,8 +32,6 @@ typedef void ID3D11InputLayout;
 typedef void IDXGISwapChain;
 #endif
 
-struct FurnaceDXTexture;
-
 class FurnaceGUIRenderDX11: public FurnaceGUIRender {
   ID3D11Device* device;
   ID3D11DeviceContext* context;
@@ -45,6 +43,8 @@ class FurnaceGUIRenderDX11: public FurnaceGUIRender {
   ID3D11Buffer* quadVertex;
   int outW, outH;
 
+  bool dead;
+
   // SHADERS //
   // -> wipe
   ID3D11VertexShader* sh_wipe_vertex;
@@ -59,16 +59,14 @@ class FurnaceGUIRenderDX11: public FurnaceGUIRender {
   bool destroyRenderTarget();
   bool createRenderTarget();
 
-  std::vector<FurnaceDXTexture*> textures;
-
   public:
-    ImTextureID getTextureID(void* which);
+    ImTextureID getTextureID(FurnaceGUITexture* which);
-    bool lockTexture(void* which, void** data, int* pitch);
+    bool lockTexture(FurnaceGUITexture* which, void** data, int* pitch);
-    bool unlockTexture(void* which);
+    bool unlockTexture(FurnaceGUITexture* which);
-    bool updateTexture(void* which, void* data, int pitch);
+    bool updateTexture(FurnaceGUITexture* which, void* data, int pitch);
-    void* createTexture(bool dynamic, int width, int height);
+    FurnaceGUITexture* createTexture(bool dynamic, int width, int height);
-    bool destroyTexture(void* which);
+    bool destroyTexture(FurnaceGUITexture* which);
-    void setTextureBlendMode(void* which, FurnaceGUIBlendMode mode);
+    void setTextureBlendMode(FurnaceGUITexture* which, FurnaceGUIBlendMode mode);
     void setBlendMode(FurnaceGUIBlendMode mode);
     void resized(const SDL_Event& ev);
     void clear(ImVec4 color);
@@ -85,6 +83,7 @@ class FurnaceGUIRenderDX11: public FurnaceGUIRender {
     void initGUI(SDL_Window* win);
     void quitGUI();
     bool quit();
+    bool isDead();
     FurnaceGUIRenderDX11():
       device(NULL),
       context(NULL),
@@ -95,6 +94,7 @@ class FurnaceGUIRenderDX11: public FurnaceGUIRender {
       quadVertex(NULL),
       outW(0),
       outH(0),
+      dead(false),
       sh_wipe_vertex(NULL),
       sh_wipe_fragment(NULL),
       sh_wipe_inputLayout(NULL),

src/gui/render/renderGL.cpp

@@ -51,7 +51,8 @@ PFNGLGETUNIFORMLOCATIONPROC furGetUniformLocation=NULL;
 PFNGLUNIFORM1FPROC furUniform1f=NULL;
 PFNGLGETSHADERINFOLOGPROC furGetShaderInfoLog=NULL;
 
-struct FurnaceGLTexture {
+class FurnaceGLTexture: public FurnaceGUITexture {
+  public:
   GLuint id;
   int width, height;
   unsigned char* lockedData;
@@ -138,12 +139,12 @@ bool FurnaceGUIRenderGL::createShader(const char* vertexS, const char* fragmentS
   return true;
 }
 
-ImTextureID FurnaceGUIRenderGL::getTextureID(void* which) {
+ImTextureID FurnaceGUIRenderGL::getTextureID(FurnaceGUITexture* which) {
   intptr_t ret=((FurnaceGLTexture*)which)->id;
   return (ImTextureID)ret;
 }
 
-bool FurnaceGUIRenderGL::lockTexture(void* which, void** data, int* pitch) {
+bool FurnaceGUIRenderGL::lockTexture(FurnaceGUITexture* which, void** data, int* pitch) {
   FurnaceGLTexture* t=(FurnaceGLTexture*)which;
   if (t->lockedData!=NULL) return false;
   t->lockedData=new unsigned char[t->width*t->height*4];
@@ -153,7 +154,7 @@ bool FurnaceGUIRenderGL::lockTexture(void* which, void** data, int* pitch) {
   return true;
 }
 
-bool FurnaceGUIRenderGL::unlockTexture(void* which) {
+bool FurnaceGUIRenderGL::unlockTexture(FurnaceGUITexture* which) {
   FurnaceGLTexture* t=(FurnaceGLTexture*)which;
   if (t->lockedData==NULL) return false;
 
@@ -167,7 +168,7 @@ bool FurnaceGUIRenderGL::unlockTexture(void* which) {
   return true;
 }
 
-bool FurnaceGUIRenderGL::updateTexture(void* which, void* data, int pitch) {
+bool FurnaceGUIRenderGL::updateTexture(FurnaceGUITexture* which, void* data, int pitch) {
   FurnaceGLTexture* t=(FurnaceGLTexture*)which;
 
   if (t->width*4!=pitch) return false;
@@ -177,7 +178,7 @@ bool FurnaceGUIRenderGL::updateTexture(void* which, void* data, int pitch) {
   return true;
 }
 
-void* FurnaceGUIRenderGL::createTexture(bool dynamic, int width, int height) {
+FurnaceGUITexture* FurnaceGUIRenderGL::createTexture(bool dynamic, int width, int height) {
   FurnaceGLTexture* t=new FurnaceGLTexture;
   C(glGenTextures(1,&t->id));
   C(glBindTexture(GL_TEXTURE_2D,t->id));
@@ -190,14 +191,14 @@ void* FurnaceGUIRenderGL::createTexture(bool dynamic, int width, int height) {
   return t;
 }
 
-bool FurnaceGUIRenderGL::destroyTexture(void* which) {
+bool FurnaceGUIRenderGL::destroyTexture(FurnaceGUITexture* which) {
   FurnaceGLTexture* t=(FurnaceGLTexture*)which;
   C(glDeleteTextures(1,&t->id));
   delete t;
   return true;
 }
 
-void FurnaceGUIRenderGL::setTextureBlendMode(void* which, FurnaceGUIBlendMode mode) {
+void FurnaceGUIRenderGL::setTextureBlendMode(FurnaceGUITexture* which, FurnaceGUIBlendMode mode) {
 }
 
 void FurnaceGUIRenderGL::setBlendMode(FurnaceGUIBlendMode mode) {
@@ -368,9 +369,6 @@ bool FurnaceGUIRenderGL::init(SDL_Window* win) {
 }
 
 void FurnaceGUIRenderGL::initGUI(SDL_Window* win) {
-  IMGUI_CHECKVERSION();
-  ImGui::CreateContext();
-
   ImGui_ImplSDL2_InitForOpenGL(win,context);
   ImGui_ImplOpenGL3_Init();
 }

src/gui/render/renderGL.h

@@ -35,13 +35,13 @@ class FurnaceGUIRenderGL: public FurnaceGUIRender {
   bool createShader(const char* vertexS, const char* fragmentS, int& vertex, int& fragment, int& program);
 
   public:
-    ImTextureID getTextureID(void* which);
+    ImTextureID getTextureID(FurnaceGUITexture* which);
-    bool lockTexture(void* which, void** data, int* pitch);
+    bool lockTexture(FurnaceGUITexture* which, void** data, int* pitch);
-    bool unlockTexture(void* which);
+    bool unlockTexture(FurnaceGUITexture* which);
-    bool updateTexture(void* which, void* data, int pitch);
+    bool updateTexture(FurnaceGUITexture* which, void* data, int pitch);
-    void* createTexture(bool dynamic, int width, int height);
+    FurnaceGUITexture* createTexture(bool dynamic, int width, int height);
-    bool destroyTexture(void* which);
+    bool destroyTexture(FurnaceGUITexture* which);
-    void setTextureBlendMode(void* which, FurnaceGUIBlendMode mode);
+    void setTextureBlendMode(FurnaceGUITexture* which, FurnaceGUIBlendMode mode);
     void setBlendMode(FurnaceGUIBlendMode mode);
     void clear(ImVec4 color);
     bool newFrame();

src/gui/render/renderSDL.cpp

@@ -20,45 +20,65 @@
 #include "renderSDL.h"
 #include "backends/imgui_impl_sdlrenderer2.h"
 
-ImTextureID FurnaceGUIRenderSDL::getTextureID(void* which) {
+class FurnaceSDLTexture: public FurnaceGUITexture {
-  return which;
+  public:
+  SDL_Texture* tex;
+  FurnaceSDLTexture():
+    tex(NULL) {}
+};
+
+ImTextureID FurnaceGUIRenderSDL::getTextureID(FurnaceGUITexture* which) {
+  FurnaceSDLTexture* t=(FurnaceSDLTexture*)which;
+  return t->tex;
 }
 
-bool FurnaceGUIRenderSDL::lockTexture(void* which, void** data, int* pitch) {
+bool FurnaceGUIRenderSDL::lockTexture(FurnaceGUITexture* which, void** data, int* pitch) {
-  return SDL_LockTexture((SDL_Texture*)which,NULL,data,pitch)==0;
+  FurnaceSDLTexture* t=(FurnaceSDLTexture*)which;
+  return SDL_LockTexture(t->tex,NULL,data,pitch)==0;
 }
 
-bool FurnaceGUIRenderSDL::unlockTexture(void* which) {
+bool FurnaceGUIRenderSDL::unlockTexture(FurnaceGUITexture* which) {
-  SDL_UnlockTexture((SDL_Texture*)which);
+  FurnaceSDLTexture* t=(FurnaceSDLTexture*)which;
+  SDL_UnlockTexture(t->tex);
   return true;
 }
 
-bool FurnaceGUIRenderSDL::updateTexture(void* which, void* data, int pitch) {
+bool FurnaceGUIRenderSDL::updateTexture(FurnaceGUITexture* which, void* data, int pitch) {
-  return SDL_UpdateTexture((SDL_Texture*)which,NULL,data,pitch)==0;
+  FurnaceSDLTexture* t=(FurnaceSDLTexture*)which;
+  return SDL_UpdateTexture(t->tex,NULL,data,pitch)==0;
 }
 
-void* FurnaceGUIRenderSDL::createTexture(bool dynamic, int width, int height) {
+FurnaceGUITexture* FurnaceGUIRenderSDL::createTexture(bool dynamic, int width, int height) {
-  return SDL_CreateTexture(sdlRend,SDL_PIXELFORMAT_ABGR8888,dynamic?SDL_TEXTUREACCESS_STREAMING:SDL_TEXTUREACCESS_STATIC,width,height);
+  SDL_Texture* t=SDL_CreateTexture(sdlRend,SDL_PIXELFORMAT_ABGR8888,dynamic?SDL_TEXTUREACCESS_STREAMING:SDL_TEXTUREACCESS_STATIC,width,height);
+
+  if (t==NULL) return NULL;
+  FurnaceSDLTexture* ret=new FurnaceSDLTexture;
+  ret->tex=t;
+  return ret;
 }
 
-bool FurnaceGUIRenderSDL::destroyTexture(void* which) {
+bool FurnaceGUIRenderSDL::destroyTexture(FurnaceGUITexture* which) {
-  SDL_DestroyTexture((SDL_Texture*)which);
+  FurnaceSDLTexture* t=(FurnaceSDLTexture*)which;
+
+  SDL_DestroyTexture(t->tex);
+  delete t;
   return true;
 }
 
-void FurnaceGUIRenderSDL::setTextureBlendMode(void* which, FurnaceGUIBlendMode mode) {
+void FurnaceGUIRenderSDL::setTextureBlendMode(FurnaceGUITexture* which, FurnaceGUIBlendMode mode) {
+  FurnaceSDLTexture* t=(FurnaceSDLTexture*)which;
   switch (mode) {
     case GUI_BLEND_MODE_NONE:
-      SDL_SetTextureBlendMode((SDL_Texture*)which,SDL_BLENDMODE_NONE);
+      SDL_SetTextureBlendMode(t->tex,SDL_BLENDMODE_NONE);
       break;
     case GUI_BLEND_MODE_BLEND:
-      SDL_SetTextureBlendMode((SDL_Texture*)which,SDL_BLENDMODE_BLEND);
+      SDL_SetTextureBlendMode(t->tex,SDL_BLENDMODE_BLEND);
       break;
     case GUI_BLEND_MODE_ADD:
-      SDL_SetTextureBlendMode((SDL_Texture*)which,SDL_BLENDMODE_ADD);
+      SDL_SetTextureBlendMode(t->tex,SDL_BLENDMODE_ADD);
       break;
     case GUI_BLEND_MODE_MULTIPLY:
-      SDL_SetTextureBlendMode((SDL_Texture*)which,SDL_BLENDMODE_MOD);
+      SDL_SetTextureBlendMode(t->tex,SDL_BLENDMODE_MOD);
       break;
   }
 }
@@ -128,9 +148,6 @@ bool FurnaceGUIRenderSDL::init(SDL_Window* win) {
 }
 
 void FurnaceGUIRenderSDL::initGUI(SDL_Window* win) {
-  IMGUI_CHECKVERSION();
-  ImGui::CreateContext();
-
   ImGui_ImplSDL2_InitForSDLRenderer(win,sdlRend);
   ImGui_ImplSDLRenderer2_Init(sdlRend);
 }

src/gui/render/renderSDL.h

@@ -22,13 +22,13 @@
 class FurnaceGUIRenderSDL: public FurnaceGUIRender {
   SDL_Renderer* sdlRend;
   public:
-    ImTextureID getTextureID(void* which);
+    ImTextureID getTextureID(FurnaceGUITexture* which);
-    bool lockTexture(void* which, void** data, int* pitch);
+    bool lockTexture(FurnaceGUITexture* which, void** data, int* pitch);
-    bool unlockTexture(void* which);
+    bool unlockTexture(FurnaceGUITexture* which);
-    bool updateTexture(void* which, void* data, int pitch);
+    bool updateTexture(FurnaceGUITexture* which, void* data, int pitch);
-    void* createTexture(bool dynamic, int width, int height);
+    FurnaceGUITexture* createTexture(bool dynamic, int width, int height);
-    bool destroyTexture(void* which);
+    bool destroyTexture(FurnaceGUITexture* which);
-    void setTextureBlendMode(void* which, FurnaceGUIBlendMode mode);
+    void setTextureBlendMode(FurnaceGUITexture* which, FurnaceGUIBlendMode mode);
     void setBlendMode(FurnaceGUIBlendMode mode);
     void clear(ImVec4 color);
     bool newFrame();