prepare to handle other texture formats

required for DirectX 9...

src/gui/chanOsc.cpp

@@ -212,7 +212,7 @@ void FurnaceGUI::drawChanOsc() {
 
       if (chanOscUseGrad) {
         if (chanOscGradTex==NULL) {
-          chanOscGradTex=rend->createTexture(true,chanOscGrad.width,chanOscGrad.height);
+          chanOscGradTex=rend->createTexture(true,chanOscGrad.width,chanOscGrad.height,true,bestTexFormat);
 
           if (chanOscGradTex==NULL) {
             logE("error while creating gradient texture!");

src/gui/debugWindow.cpp

@@ -614,7 +614,7 @@ void FurnaceGUI::drawDebug() {
       ImGui::Text("Create and Destroy 128 Textures");
       if (ImGui::Button("No Write")) {
         for (int i=0; i<128; i++) {
-          FurnaceGUITexture* t=rend->createTexture(false,2048,2048);
+          FurnaceGUITexture* t=rend->createTexture(false,2048,2048,true,bestTexFormat);
           if (t==NULL) {
             showError(fmt::sprintf("Failure! %d",i));
             break;
@@ -628,7 +628,7 @@ void FurnaceGUI::drawDebug() {
           data[i]=rand();
         }
         for (int i=0; i<128; i++) {
-          FurnaceGUITexture* t=rend->createTexture(false,2048,2048);
+          FurnaceGUITexture* t=rend->createTexture(false,2048,2048,true,bestTexFormat);
           if (t==NULL) {
             showError(fmt::sprintf("Failure! %d",i));
             break;
@@ -642,7 +642,7 @@ void FurnaceGUI::drawDebug() {
         unsigned char* data=NULL;
         int pitch=0;
         for (int i=0; i<128; i++) {
-          FurnaceGUITexture* t=rend->createTexture(false,2048,2048);
+          FurnaceGUITexture* t=rend->createTexture(false,2048,2048,true,bestTexFormat);
           if (t==NULL) {
             showError(fmt::sprintf("Failure! %d",i));
             break;

src/gui/gui.cpp

@@ -7091,6 +7091,18 @@ bool FurnaceGUI::init() {
   }
   logV("render backend started");
 
+  // set best texture format
+  unsigned int availTexFormats=rend->getTextureFormats();
+  if (availTexFormats&GUI_TEXFORMAT_ABGR32) {
+    bestTexFormat=GUI_TEXFORMAT_ABGR32;
+  } else if (availTexFormats&GUI_TEXFORMAT_ARGB32) {
+    bestTexFormat=GUI_TEXFORMAT_ARGB32;
+  } else if (availTexFormats&GUI_TEXFORMAT_RGBA32) {
+    bestTexFormat=GUI_TEXFORMAT_RGBA32;
+  } else if (availTexFormats&GUI_TEXFORMAT_BGRA32) {
+    bestTexFormat=GUI_TEXFORMAT_BGRA32;
+  }
+
   // try acquiring the canvas size
   if (!rend->getOutputSize(canvasW,canvasH)) {
     logW("could not get renderer output size!");

src/gui/gui.h

@@ -1443,6 +1443,14 @@ struct FurnaceGUIWaveSizeEntry {
     sys(NULL) {}
 };
 
+enum FurnaceGUITextureFormat: unsigned int {
+  GUI_TEXFORMAT_UNKNOWN=0,
+  GUI_TEXFORMAT_ABGR32=1,
+  GUI_TEXFORMAT_ARGB32=2,
+  GUI_TEXFORMAT_BGRA32=4,
+  GUI_TEXFORMAT_RGBA32=8,
+};
+
 class FurnaceGUITexture {
 };
 
@@ -1482,10 +1490,11 @@ class FurnaceGUIRender {
     virtual ImTextureID getTextureID(FurnaceGUITexture* which);
     virtual float getTextureU(FurnaceGUITexture* which);
     virtual float getTextureV(FurnaceGUITexture* which);
+    virtual FurnaceGUITextureFormat getTextureFormat(FurnaceGUITexture* which);
     virtual bool lockTexture(FurnaceGUITexture* which, void** data, int* pitch);
     virtual bool unlockTexture(FurnaceGUITexture* which);
     virtual bool updateTexture(FurnaceGUITexture* which, void* data, int pitch);
-    virtual FurnaceGUITexture* createTexture(bool dynamic, int width, int height, bool interpolate=true);
+    virtual FurnaceGUITexture* createTexture(bool dynamic, int width, int height, bool interpolate=true, FurnaceGUITextureFormat format=GUI_TEXFORMAT_ABGR32);
     virtual bool destroyTexture(FurnaceGUITexture* which);
     virtual void setTextureBlendMode(FurnaceGUITexture* which, FurnaceGUIBlendMode mode);
     virtual void setBlendMode(FurnaceGUIBlendMode mode);
@@ -1504,6 +1513,7 @@ class FurnaceGUIRender {
     virtual int getWindowFlags();
     virtual int getMaxTextureWidth();
     virtual int getMaxTextureHeight();
+    virtual unsigned int getTextureFormats();
     virtual const char* getBackendName();
     virtual const char* getVendorName();
     virtual const char* getDeviceName();
@@ -1543,6 +1553,7 @@ class FurnaceGUI {
 
   FurnaceGUIRenderBackend renderBackend;
   FurnaceGUIRender* rend;
+  FurnaceGUITextureFormat bestTexFormat;
 
   SDL_Window* sdlWin;
   SDL_Haptic* vibrator;

src/gui/image.cpp

@@ -54,7 +54,7 @@ FurnaceGUITexture* FurnaceGUI::getTexture(FurnaceGUIImages image, FurnaceGUIBlen
   if (img->width<=0 || img->height<=0) return NULL;
 
   if (img->tex==NULL) {
-    img->tex=rend->createTexture(false,img->width,img->height);
+    img->tex=rend->createTexture(false,img->width,img->height,true,bestTexFormat);
     if (img->tex==NULL) {
       logE("error while creating image %d texture! %s",(int)image,SDL_GetError());
       return NULL;

src/gui/render/abstract.cpp

@@ -31,6 +31,10 @@ float FurnaceGUIRender::getTextureV(FurnaceGUITexture* which) {
   return 1.0;
 }
 
+FurnaceGUITextureFormat FurnaceGUIRender::getTextureFormat(FurnaceGUITexture* which) {
+  return GUI_TEXFORMAT_UNKNOWN;
+}
+
 bool FurnaceGUIRender::lockTexture(FurnaceGUITexture* which, void** data, int* pitch) {
   return false;
 }
@@ -43,7 +47,7 @@ bool FurnaceGUIRender::updateTexture(FurnaceGUITexture* which, void* data, int p
   return false;
 }
 
-FurnaceGUITexture* FurnaceGUIRender::createTexture(bool dynamic, int width, int height, bool interpolate) {
+FurnaceGUITexture* FurnaceGUIRender::createTexture(bool dynamic, int width, int height, bool interpolate, FurnaceGUITextureFormat format) {
   return NULL;
 }
 
@@ -109,6 +113,10 @@ int FurnaceGUIRender::getMaxTextureHeight() {
   return 0;
 }
 
+unsigned int FurnaceGUIRender::getTextureFormats() {
+  return 0;
+}
+
 const char* FurnaceGUIRender::getBackendName() {
   return "Dummy";
 }

src/gui/render/renderDX11.cpp

@@ -200,7 +200,7 @@ bool FurnaceGUIRenderDX11::updateTexture(FurnaceGUITexture* which, void* data, i
   return true;
 }
 
-FurnaceGUITexture* FurnaceGUIRenderDX11::createTexture(bool dynamic, int width, int height, bool interpolate) {
+FurnaceGUITexture* FurnaceGUIRenderDX11::createTexture(bool dynamic, int width, int height, bool interpolate, FurnaceGUITextureFormat format) {
   D3D11_TEXTURE2D_DESC texDesc;
   D3D11_SHADER_RESOURCE_VIEW_DESC viewDesc;
   ID3D11Texture2D* tex=NULL;
@@ -214,7 +214,23 @@ FurnaceGUITexture* FurnaceGUIRenderDX11::createTexture(bool dynamic, int width,
   texDesc.Height=height;
   texDesc.MipLevels=1;
   texDesc.ArraySize=1;
-  texDesc.Format=DXGI_FORMAT_R8G8B8A8_UNORM; // ???
+  switch (format) {
+    case GUI_TEXFORMAT_ABGR32:
+      texDesc.Format=DXGI_FORMAT_R8G8B8A8_UNORM;
+      break;
+    case GUI_TEXFORMAT_ARGB32:
+      texDesc.Format=DXGI_FORMAT_B8G8R8A8_UNORM;
+      break;
+    case GUI_TEXFORMAT_BGRA32:
+      texDesc.Format=DXGI_FORMAT_A8R8G8B8_UNORM;
+      break;
+    case GUI_TEXFORMAT_RGBA32:
+      texDesc.Format=DXGI_FORMAT_A8B8G8R8_UNORM;
+      break;
+    default:
+      logE("unsupported texture format!");
+      return NULL;
+  }
   texDesc.SampleDesc.Count=1;
   texDesc.SampleDesc.Quality=0;
   texDesc.Usage=dynamic?D3D11_USAGE_DYNAMIC:D3D11_USAGE_DEFAULT;
@@ -377,6 +393,10 @@ int FurnaceGUIRenderDX11::getMaxTextureHeight() {
   return maxHeight;
 }
 
+unsigned int FurnaceGUIRenderDX11::getTextureFormats() {
+  return GUI_TEXFORMAT_ABGR32|GUI_TEXFORMAT_ARGB32|GUI_TEXFORMAT_BGRA32|GUI_TEXFORMAT_RGBA32;
+}
+
 const char* FurnaceGUIRenderDX11::getBackendName() {
   return "DirectX 11";
 }

src/gui/render/renderDX11.h

@@ -67,7 +67,7 @@ class FurnaceGUIRenderDX11: public FurnaceGUIRender {
     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);
+    FurnaceGUITexture* createTexture(bool dynamic, int width, int height, bool interpolate=true, FurnaceGUITextureFormat format=GUI_TEXFORMAT_ABGR32);
     bool destroyTexture(FurnaceGUITexture* which);
     void setTextureBlendMode(FurnaceGUITexture* which, FurnaceGUIBlendMode mode);
     void setBlendMode(FurnaceGUIBlendMode mode);
@@ -84,6 +84,7 @@ class FurnaceGUIRenderDX11: public FurnaceGUIRender {
     int getWindowFlags();
     int getMaxTextureWidth();
     int getMaxTextureHeight();
+    unsigned int getTextureFormats();
     const char* getBackendName();
     const char* getVendorName();
     const char* getDeviceName();

src/gui/render/renderDX9.cpp

@@ -144,12 +144,17 @@ bool FurnaceGUIRenderDX9::updateTexture(FurnaceGUITexture* which, void* data, in
   return true;
 }
 
-FurnaceGUITexture* FurnaceGUIRenderDX9::createTexture(bool dynamic, int width, int height, bool interpolate) {  
+FurnaceGUITexture* FurnaceGUIRenderDX9::createTexture(bool dynamic, int width, int height, bool interpolate, FurnaceGUITextureFormat format) {  
   IDirect3DTexture9* tex=NULL;
   IDirect3DTexture9* texPre=NULL;
   int widthReal=width;
   int heightReal=height;
 
+  if (format!=GUI_TEXFORMAT_ARGB32) {
+    logE("unsupported texture format!");
+    return NULL;
+  }
+
   if ((widthReal&(widthReal-1))!=0) {
     widthReal=1<<bsr(width);
   }
@@ -339,6 +344,10 @@ int FurnaceGUIRenderDX9::getMaxTextureHeight() {
   return maxHeight;
 }
 
+unsigned int FurnaceGUIRenderDX9::getTextureFormats() {
+  return GUI_TEXFORMAT_ARGB32;
+}
+
 const char* FurnaceGUIRenderDX9::getBackendName() {
   return "DirectX 9";
 }

src/gui/render/renderDX9.h

@@ -52,7 +52,7 @@ class FurnaceGUIRenderDX9: public FurnaceGUIRender {
     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);
+    FurnaceGUITexture* createTexture(bool dynamic, int width, int height, bool interpolate=true, FurnaceGUITextureFormat format=GUI_TEXFORMAT_ABGR32);
     bool destroyTexture(FurnaceGUITexture* which);
     void setTextureBlendMode(FurnaceGUITexture* which, FurnaceGUIBlendMode mode);
     void setBlendMode(FurnaceGUIBlendMode mode);
@@ -69,6 +69,7 @@ class FurnaceGUIRenderDX9: public FurnaceGUIRender {
     int getWindowFlags();
     int getMaxTextureWidth();
     int getMaxTextureHeight();
+    unsigned int getTextureFormats();
     const char* getBackendName();
     const char* getVendorName();
     const char* getDeviceName();

src/gui/render/renderGL.cpp

@@ -315,7 +315,11 @@ bool FurnaceGUIRenderGL::updateTexture(FurnaceGUITexture* which, void* data, int
   return true;
 }
 
-FurnaceGUITexture* FurnaceGUIRenderGL::createTexture(bool dynamic, int width, int height, bool interpolate) {
+FurnaceGUITexture* FurnaceGUIRenderGL::createTexture(bool dynamic, int width, int height, bool interpolate, FurnaceGUITextureFormat format) {
+  if (format!=GUI_TEXFORMAT_ABGR32) {
+    logE("unsupported texture format!");
+    return NULL;
+  }
   FurnaceGLTexture* t=new FurnaceGLTexture;
   C(glGenTextures(1,&t->id));
   C(glBindTexture(GL_TEXTURE_2D,t->id));
@@ -554,6 +558,10 @@ int FurnaceGUIRenderGL::getMaxTextureHeight() {
   return maxHeight;
 }
 
+unsigned int FurnaceGUIRenderGL::getTextureFormats() {
+  return GUI_TEXFORMAT_ABGR32;
+}
+
 const char* FurnaceGUIRenderGL::getBackendName() {
   return backendName.c_str();
 }

src/gui/render/renderGL.h

@@ -59,7 +59,7 @@ class FurnaceGUIRenderGL: public FurnaceGUIRender {
     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);
+    FurnaceGUITexture* createTexture(bool dynamic, int width, int height, bool interpolate=true, FurnaceGUITextureFormat format=GUI_TEXFORMAT_ABGR32);
     bool destroyTexture(FurnaceGUITexture* which);
     void setTextureBlendMode(FurnaceGUITexture* which, FurnaceGUIBlendMode mode);
     void setBlendMode(FurnaceGUIBlendMode mode);
@@ -77,6 +77,7 @@ class FurnaceGUIRenderGL: public FurnaceGUIRender {
     int getWindowFlags();
     int getMaxTextureWidth();
     int getMaxTextureHeight();
+    unsigned int getTextureFormats();
     const char* getBackendName();
     const char* getVendorName();
     const char* getDeviceName();

src/gui/render/renderGL1.cpp

@@ -92,7 +92,11 @@ bool FurnaceGUIRenderGL1::updateTexture(FurnaceGUITexture* which, void* data, in
   return true;
 }
 
-FurnaceGUITexture* FurnaceGUIRenderGL1::createTexture(bool dynamic, int width, int height, bool interpolate) {
+FurnaceGUITexture* FurnaceGUIRenderGL1::createTexture(bool dynamic, int width, int height, bool interpolate, FurnaceGUITextureFormat format) {
+  if (format!=GUI_TEXFORMAT_ABGR32) {
+    logE("unsupported texture format!");
+    return NULL;
+  }
   FurnaceGL1Texture* t=new FurnaceGL1Texture;
   C(glGenTextures(1,&t->id));
   C(glBindTexture(GL_TEXTURE_2D,t->id));
@@ -221,6 +225,10 @@ int FurnaceGUIRenderGL1::getMaxTextureHeight() {
   return maxHeight;
 }
 
+unsigned int FurnaceGUIRenderGL1::getTextureFormats() {
+  return GUI_TEXFORMAT_ABGR32;
+}
+
 const char* FurnaceGUIRenderGL1::getBackendName() {
   return "OpenGL 1.1";
 }

src/gui/render/renderGL1.h

@@ -35,7 +35,7 @@ class FurnaceGUIRenderGL1: public FurnaceGUIRender {
     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);
+    FurnaceGUITexture* createTexture(bool dynamic, int width, int height, bool interpolate=true, FurnaceGUITextureFormat format=GUI_TEXFORMAT_ABGR32);
     bool destroyTexture(FurnaceGUITexture* which);
     void setTextureBlendMode(FurnaceGUITexture* which, FurnaceGUIBlendMode mode);
     void setBlendMode(FurnaceGUIBlendMode mode);
@@ -51,6 +51,7 @@ class FurnaceGUIRenderGL1: public FurnaceGUIRender {
     int getWindowFlags();
     int getMaxTextureWidth();
     int getMaxTextureHeight();
+    unsigned int getTextureFormats();
     const char* getBackendName();
     const char* getVendorName();
     const char* getDeviceName();

src/gui/render/renderMetal.h

@@ -31,7 +31,7 @@ class FurnaceGUIRenderMetal: public FurnaceGUIRender {
     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);
+    FurnaceGUITexture* createTexture(bool dynamic, int width, int height, bool interpolate=true, FurnaceGUITextureFormat format=GUI_TEXFORMAT_ABGR32);
     bool destroyTexture(FurnaceGUITexture* which);
     void setTextureBlendMode(FurnaceGUITexture* which, FurnaceGUIBlendMode mode);
     void setBlendMode(FurnaceGUIBlendMode mode);
@@ -47,6 +47,7 @@ class FurnaceGUIRenderMetal: public FurnaceGUIRender {
     int getWindowFlags();
     int getMaxTextureWidth();
     int getMaxTextureHeight();
+    unsigned int getTextureFormats();
     const char* getBackendName();
     const char* getVendorName();
     const char* getDeviceName();

src/gui/render/renderMetal.mm

@@ -84,7 +84,11 @@ bool FurnaceGUIRenderMetal::updateTexture(FurnaceGUITexture* which, void* data,
   return true;
 }
 
-FurnaceGUITexture* FurnaceGUIRenderMetal::createTexture(bool dynamic, int width, int height, bool interpolate) {
+FurnaceGUITexture* FurnaceGUIRenderMetal::createTexture(bool dynamic, int width, int height, bool interpolate, FurnaceGUITextureFormat format) {
+  if (format!=GUI_TEXFORMAT_ABGR32) {
+    logE("unsupported texture format!");
+    return NULL;
+  }
   MTLTextureDescriptor* texDesc=[MTLTextureDescriptor texture2DDescriptorWithPixelFormat:MTLPixelFormatRGBA8Unorm width:(NSUInteger)width height:(NSUInteger)height mipmapped:NO];
   texDesc.usage=MTLTextureUsageShaderRead;
   texDesc.storageMode=MTLStorageModeManaged;
@@ -193,6 +197,10 @@ int FurnaceGUIRenderMetal::getMaxTextureHeight() {
   return bigTextures?16384:8192;
 }
 
+unsigned int FurnaceGUIRenderMetal::getTextureFormats() {
+  return GUI_TEXFORMAT_ABGR32;
+}
+
 const char* FurnaceGUIRenderMetal::getBackendName() {
   return "Metal";
 }

src/gui/render/renderSDL.cpp

@@ -49,7 +49,11 @@ bool FurnaceGUIRenderSDL::updateTexture(FurnaceGUITexture* which, void* data, in
   return SDL_UpdateTexture(t->tex,NULL,data,pitch)==0;
 }
 
-FurnaceGUITexture* FurnaceGUIRenderSDL::createTexture(bool dynamic, int width, int height, bool interpolate) {
+FurnaceGUITexture* FurnaceGUIRenderSDL::createTexture(bool dynamic, int width, int height, bool interpolate, FurnaceGUITextureFormat format) {
+  if (format!=GUI_TEXFORMAT_ABGR32) {
+    logE("unsupported texture format!");
+    return NULL;
+  }
   SDL_SetHint(SDL_HINT_RENDER_SCALE_QUALITY,interpolate?"1":"0");
   SDL_Texture* t=SDL_CreateTexture(sdlRend,SDL_PIXELFORMAT_ABGR8888,dynamic?SDL_TEXTUREACCESS_STREAMING:SDL_TEXTUREACCESS_STATIC,width,height);
   SDL_SetHint(SDL_HINT_RENDER_SCALE_QUALITY,"1");
@@ -156,6 +160,10 @@ int FurnaceGUIRenderSDL::getMaxTextureHeight() {
   return renderInfo.max_texture_height;
 }
 
+unsigned int FurnaceGUIRenderSDL::getTextureFormats() {
+  return GUI_TEXFORMAT_ABGR32;
+}
+
 const char* FurnaceGUIRenderSDL::getBackendName() {
   return "SDL Renderer";
 }

src/gui/render/renderSDL.h

@@ -29,7 +29,7 @@ class FurnaceGUIRenderSDL: public FurnaceGUIRender {
     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);
+    FurnaceGUITexture* createTexture(bool dynamic, int width, int height, bool interpolate=true, FurnaceGUITextureFormat format=GUI_TEXFORMAT_ABGR32);
     bool destroyTexture(FurnaceGUITexture* which);
     void setTextureBlendMode(FurnaceGUITexture* which, FurnaceGUIBlendMode mode);
     void setBlendMode(FurnaceGUIBlendMode mode);
@@ -45,6 +45,7 @@ class FurnaceGUIRenderSDL: public FurnaceGUIRender {
     int getWindowFlags();
     int getMaxTextureWidth();
     int getMaxTextureHeight();
+    unsigned int getTextureFormats();
     const char* getBackendName();
     const char* getVendorName();
     const char* getDeviceName();

src/gui/render/renderSoftware.cpp

@@ -52,7 +52,11 @@ bool FurnaceGUIRenderSoftware::updateTexture(FurnaceGUITexture* which, void* dat
   return true;
 }
 
-FurnaceGUITexture* FurnaceGUIRenderSoftware::createTexture(bool dynamic, int width, int height, bool interpolate) {
+FurnaceGUITexture* FurnaceGUIRenderSoftware::createTexture(bool dynamic, int width, int height, bool interpolate, FurnaceGUITextureFormat format) {
+  if (format!=GUI_TEXFORMAT_ARGB32) {
+    logE("unsupported texture format!");
+    return NULL;
+  }
   FurnaceSoftwareTexture* ret=new FurnaceSoftwareTexture;
   ret->tex=new SWTexture(width,height);
   return ret;
@@ -141,6 +145,10 @@ int FurnaceGUIRenderSoftware::getMaxTextureHeight() {
   return 16384;
 }
 
+unsigned int FurnaceGUIRenderSoftware::getTextureFormats() {
+  return GUI_TEXFORMAT_ARGB32;
+}
+
 const char* FurnaceGUIRenderSoftware::getBackendName() {
   return "Software";
 }

src/gui/render/renderSoftware.h

@@ -26,7 +26,7 @@ class FurnaceGUIRenderSoftware: public FurnaceGUIRender {
     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);
+    FurnaceGUITexture* createTexture(bool dynamic, int width, int height, bool interpolate=true, FurnaceGUITextureFormat format=GUI_TEXFORMAT_ABGR32);
     bool destroyTexture(FurnaceGUITexture* which);
     void setTextureBlendMode(FurnaceGUITexture* which, FurnaceGUIBlendMode mode);
     void setBlendMode(FurnaceGUIBlendMode mode);
@@ -42,6 +42,7 @@ class FurnaceGUIRenderSoftware: public FurnaceGUIRender {
     int getWindowFlags();
     int getMaxTextureWidth();
     int getMaxTextureHeight();
+    unsigned int getTextureFormats();
     const char* getBackendName();
     const char* getVendorName();
     const char* getDeviceName();

src/gui/sampleEdit.cpp

@@ -1476,7 +1476,7 @@ void FurnaceGUI::drawSampleEdit() {
         }
         if (avail.x>=1 && avail.y>=1) {
           logD("recreating sample texture.");
-          sampleTex=rend->createTexture(true,avail.x,avail.y);
+          sampleTex=rend->createTexture(true,avail.x,avail.y,true,bestTexFormat);
           sampleTexW=avail.x;
           sampleTexH=avail.y;
           if (sampleTex==NULL) {

src/gui/tutorial.cpp

@@ -791,7 +791,7 @@ void FurnaceGUI::drawTutorial() {
         cv->hiScore=cvHiScore;
       }
       if (cvTex==NULL) {
-        cvTex=rend->createTexture(true,320,224,false);
+        cvTex=rend->createTexture(true,320,224,false,bestTexFormat);
       }
 
       if (cv->pleaseInitSongs) {