Merge pull request #1711 from marauder2k9-torque/GLFix-BlackTerrain-issue

OPENGL: Terrain doesnt render correctly

Engine/source/environment/scatterSky.cpp

@@ -1094,7 +1094,7 @@ void ScatterSky::_render( ObjectRenderInst *ri, SceneRenderState *state, BaseMat
    }
    else
    {
-      GFX->setCubeTexture( 0, NULL );
+      GFX->setTexture( 0, NULL );
       mShaderConsts->setSafe( mUseCubemapSC, 0.0f );
    }
 

Engine/source/gfx/bitmap/loaders/bitmapPng.cpp

@@ -41,15 +41,16 @@
 #endif
 
 
-static bool sReadPNG(const Torque::Path& path, GBitmap* bitmap);
-static bool sReadStreamPNG(Stream& stream, GBitmap* bitmap, U32 len);
-
 /// Compression levels for PNGs range from 0-9.
 /// A value outside that range will cause the write routine to look for the best compression for a given PNG.  This can be slow.
-
+static bool sReadPNG(const Torque::Path& path, GBitmap* bitmap);
+static bool sReadStreamPNG(Stream& stream, GBitmap* bitmap, U32 len);
 static bool sWritePNG(const Torque::Path& path, GBitmap* bitmap, U32 compressionLevel);
 static bool sWriteStreamPNG(const String& bmType, Stream& stream, GBitmap* bitmap, U32 compressionLevel);
-static bool _writePNG(GBitmap *bitmap, Stream &stream, U32 compressionLevel, U32 strategy, U32 filter);
+
+// Internal functions used.
+static bool _readStreamPNG(Stream& stream, GBitmap* bitmap, U32 len, const char* filename);
+static bool _writePNG(GBitmap *bitmap, Stream &stream, U32 compressionLevel, U32 strategy, U32 filter, const char* filename = "unknown");
 
 static struct _privateRegisterPNG
 {
@@ -72,421 +73,390 @@ static struct _privateRegisterPNG
    }
 } sStaticRegisterPNG;
 
-
+//-----------------------------------------------------------------------------
-//-------------------------------------- Replacement I/O for standard LIBPng
+// PNG context passed to libpng for error reporting
-//                                        functions.  we don't wanna use
+//-----------------------------------------------------------------------------
-//                                        FILE*'s...
+struct PngContext
-static void pngReadDataFn(png_structp png_ptr,
-                    png_bytep   data,
-                    png_size_t  length)
 {
-   AssertFatal(png_get_io_ptr(png_ptr) != NULL, "No stream?");
+   const char* filename;
+   explicit PngContext(const char* f) : filename(f) {}
+};
 
+//-----------------------------------------------------------------------------
+// libpng callbacks
+//-----------------------------------------------------------------------------
+static void pngReadDataFn(png_structp png_ptr, png_bytep data, png_size_t length)
+{
    Stream* strm = (Stream*)png_get_io_ptr(png_ptr);
-   bool success = strm->read(length, data);
+   AssertFatal(strm, "pngReadDataFn - No stream.");
-   AssertFatal(success, "pngReadDataFn - failed to read from stream!");
+   if (!strm->read(length, data))
+      Con::errorf("pngReadDataFn - Failed to read %u bytes from stream.", (U32)length);
 }
 
-
+static void pngWriteDataFn(png_structp png_ptr, png_bytep data, png_size_t length)
-//--------------------------------------
-static void pngWriteDataFn(png_structp png_ptr,
-                     png_bytep   data,
-                     png_size_t  length)
 {
-   AssertFatal(png_get_io_ptr(png_ptr) != NULL, "No stream?");
-
    Stream* strm = (Stream*)png_get_io_ptr(png_ptr);
-   bool success = strm->write(length, data);
+   AssertFatal(strm, "pngWriteDataFn - No stream.");
-   AssertFatal(success, "pngWriteDataFn - failed to write to stream!");
+   if (!strm->write(length, data))
+      Con::errorf("pngWriteDataFn - Failed to write %u bytes to stream.", (U32)length);
 }
 
+static void pngFlushDataFn(png_structp /*png_ptr*/) {}
 
-//--------------------------------------
+static png_voidp pngMallocFn(png_structp /*png_ptr*/, png_size_t size) { return FrameAllocator::alloc(size); }
-static void pngFlushDataFn(png_structp /*png_ptr*/)
+static void      pngFreeFn(png_structp /*png_ptr*/, png_voidp  /*mem*/) {}
+
+static png_voidp pngRealMallocFn(png_structp /*png_ptr*/, png_size_t size) { return (png_voidp)dMalloc(size); }
+static void      pngRealFreeFn(png_structp /*png_ptr*/, png_voidp mem) { dFree(mem); }
+
+static void pngFatalErrorFn(png_structp png_ptr, png_const_charp pMessage)
 {
-   //
+   const char* filename = "unknown";
+   if (png_ptr)
+   {
+      PngContext* ctx = (PngContext*)png_get_error_ptr(png_ptr);
+      if (ctx && ctx->filename)
+         filename = ctx->filename;
+   }
+   Con::errorf("pngFatalErrorFn - Fatal error in '%s': %s", filename, pMessage);
+   AssertISV(false, avar("libpng fatal error in '%s':\n%s", filename, pMessage));
 }
 
-static png_voidp pngMallocFn(png_structp /*png_ptr*/, png_size_t size)
+static void pngWarningFn(png_structp png_ptr, png_const_charp pMessage)
 {
-   return FrameAllocator::alloc(size);
+#if TORQUE_DEBUG
+   const char* filename = "unknown";
+   if (png_ptr)
+   {
+      PngContext* ctx = (PngContext*)png_get_error_ptr(png_ptr);
+      if (ctx && ctx->filename)
+         filename = ctx->filename;
+   }
+   Con::warnf("pngWarningFn - Warning in '%s': %s", filename, pMessage);
+#endif
 }
 
-static void pngFreeFn(png_structp /*png_ptr*/, png_voidp /*mem*/)
+//-----------------------------------------------------------------------------
+// RAII guards for png read/write structs
+//-----------------------------------------------------------------------------
+struct PngReadGuard
 {
-}
+   png_structp png_ptr = nullptr;
+   png_infop   info_ptr = nullptr;
+   png_infop   end_info = nullptr;
+   PngContext  ctx;
 
-static png_voidp pngRealMallocFn(png_structp /*png_ptr*/, png_size_t size)
+   explicit PngReadGuard(const char* filename) : ctx(filename) {}
+
+   bool init()
    {
-   return (png_voidp)dMalloc(size);
+      png_ptr = png_create_read_struct_2(PNG_LIBPNG_VER_STRING,
-}
+         &ctx, pngFatalErrorFn, pngWarningFn,
-
+         NULL, pngRealMallocFn, pngRealFreeFn);
-static void pngRealFreeFn(png_structp /*png_ptr*/, png_voidp mem)
+      if (!png_ptr)
       {
-   dFree(mem);
+         Con::errorf("PngReadGuard - png_create_read_struct_2 failed for '%s'.", ctx.filename);
-}
-
-//--------------------------------------
-static void pngFatalErrorFn(png_structp     /*png_ptr*/,
-                     png_const_charp pMessage)
-{
-   AssertISV(false, avar("Error reading PNG file:\n %s", pMessage));
-}
-
-
-//--------------------------------------
-static void pngWarningFn(png_structp, png_const_charp /*pMessage*/)
-{
-   //   AssertWarn(false, avar("Warning reading PNG file:\n %s", pMessage));
-}
-
-
-//--------------------------------------
-bool sReadPNG(const Torque::Path& path, GBitmap* bitmap)
-{
-   FileStream* readPng = new FileStream;
-
-   if (!readPng->open(path.getFullPath(), Torque::FS::File::Read))
-   {
-      Con::printf("Failed to open PNG :%s", path.getFullFileName().c_str());
          return false;
       }
 
-   if (!sReadStreamPNG(*readPng, bitmap, U32_MAX))
+      info_ptr = png_create_info_struct(png_ptr);
+      if (!info_ptr)
       {
-      Con::printf("Failed to read PNG :%s", path.getFullFileName().c_str());
+         Con::errorf("PngReadGuard - png_create_info_struct (info) failed for '%s'.", ctx.filename);
          return false;
       }
 
-   readPng->close();
+      end_info = png_create_info_struct(png_ptr);
+      if (!end_info)
+      {
+         Con::errorf("PngReadGuard - png_create_info_struct (end) failed for '%s'.", ctx.filename);
+         return false;
+      }
 
       return true;
    }
 
-static bool sReadStreamPNG(Stream& stream, GBitmap* bitmap, U32 len)
+   ~PngReadGuard()
    {
-   PROFILE_SCOPE(sReadPNG);
+      if (png_ptr)
-   static const U32 cs_headerBytesChecked = 8;
+         png_destroy_read_struct(&png_ptr, &info_ptr, &end_info);
-
-   U8 header[cs_headerBytesChecked];
-   stream.read(cs_headerBytesChecked, header);
-
-   bool isPng = png_check_sig(header, cs_headerBytesChecked) != 0;
-   if (isPng == false) 
-   {
-      AssertWarn(false, "GBitmap::readPNG: stream doesn't contain a PNG");
-      return false;
    }
+};
 
-   U32 prevWaterMark = FrameAllocator::getWaterMark();
+struct PngWriteGuard
-   png_structp png_ptr = png_create_read_struct_2(PNG_LIBPNG_VER_STRING,
+{
+   png_structp png_ptr = nullptr;
+   png_infop   info_ptr = nullptr;
+   PngContext  ctx;
+
+   explicit PngWriteGuard(const char* filename) : ctx(filename) {}
+
+   bool init(bool useFrameAllocator = true)
+   {
+      png_ptr = png_create_write_struct_2(PNG_LIBPNG_VER_STRING,
+         &ctx, pngFatalErrorFn, pngWarningFn,
          NULL,
-      pngFatalErrorFn,
+         useFrameAllocator ? pngMallocFn : pngRealMallocFn,
-      pngWarningFn,
+         useFrameAllocator ? pngFreeFn : pngRealFreeFn);
-      NULL,
+      if (!png_ptr)
-      pngRealMallocFn,
-      pngRealFreeFn);
-
-   if (png_ptr == NULL) 
       {
-      FrameAllocator::setWaterMark(prevWaterMark);
+         Con::errorf("PngWriteGuard - png_create_write_struct_2 failed for '%s'.", ctx.filename);
          return false;
       }
 
-   png_infop info_ptr = png_create_info_struct(png_ptr);
+      info_ptr = png_create_info_struct(png_ptr);
-   if (info_ptr == NULL) 
+      if (!info_ptr)
       {
-      png_destroy_read_struct(&png_ptr,
+         Con::errorf("PngWriteGuard - png_create_info_struct failed for '%s'.", ctx.filename);
-         (png_infopp)NULL,
-         (png_infopp)NULL);
-
-      FrameAllocator::setWaterMark(prevWaterMark);
          return false;
       }
 
-   png_infop end_info = png_create_info_struct(png_ptr);
+      return true;
-   if (end_info == NULL) 
-   {
-      png_destroy_read_struct(&png_ptr,
-         &info_ptr,
-         (png_infopp)NULL);
-
-      FrameAllocator::setWaterMark(prevWaterMark);
-      return false;
    }
 
-   png_set_read_fn(png_ptr, &stream, pngReadDataFn);
+   ~PngWriteGuard()
+   {
+      if (png_ptr)
+         png_destroy_write_struct(&png_ptr, (png_infopp)NULL);
+   }
+};
 
-   // Read off the info on the image.
+//-----------------------------------------------------------------------------
-   png_set_sig_bytes(png_ptr, cs_headerBytesChecked);
+// Shared helpers
-   png_read_info(png_ptr, info_ptr);
+//-----------------------------------------------------------------------------
+static GFXFormat _determineReadFormat(png_structp png_ptr, png_infop info_ptr, bool& transAlpha)
+{
+   S32 bit_depth, color_type;
+   png_uint_32 width, height;
+   png_get_IHDR(png_ptr, info_ptr, &width, &height, &bit_depth, &color_type, NULL, NULL, NULL);
 
-   // OK, at this point, if we have reached it ok, then we can reset the
+   transAlpha = false;
-   //  image to accept the new data...
-   //
-   bitmap->deleteImage();
-
-   png_uint_32 width;
-   png_uint_32 height;
-   S32 bit_depth;
-   S32 color_type;
-
-   png_get_IHDR(png_ptr, info_ptr,
-      &width, &height,             // obv.
-      &bit_depth, &color_type,     // obv.
-      NULL,                        // interlace
-      NULL,                        // compression_type
-      NULL);                       // filter_type
-
-   // First, handle the color transformations.  We need this to read in the
-   //  data as RGB or RGBA, _always_, with a maximal channel width of 8 bits.
-   //
-   bool transAlpha     = false;
    GFXFormat format = GFXFormatR8G8B8;
 
-   // Strip off any 16 bit info
-   //
    if (bit_depth == 16 && color_type != PNG_COLOR_TYPE_GRAY)
-   {
       png_set_strip_16(png_ptr);
-   }
 
-   // Expand a transparency channel into a full alpha channel...
-   //
    if (png_get_valid(png_ptr, info_ptr, PNG_INFO_tRNS))
    {
       png_set_expand(png_ptr);
       transAlpha = true;
    }
 
-   if (color_type == PNG_COLOR_TYPE_PALETTE) 
+   switch (color_type)
    {
+   case PNG_COLOR_TYPE_PALETTE:
       png_set_expand(png_ptr);
       format = transAlpha ? GFXFormatR8G8B8A8 : GFXFormatR8G8B8;
-   }
+      break;
-   else if (color_type == PNG_COLOR_TYPE_GRAY) 
+   case PNG_COLOR_TYPE_GRAY:
-   {
       png_set_expand(png_ptr);
-
+      format = (bit_depth == 16) ? GFXFormatR5G6B5 : GFXFormatA8;
-      if (bit_depth == 16)
+      break;
-         format = GFXFormatR5G6B5;
+   case PNG_COLOR_TYPE_GRAY_ALPHA:
-      else
-         format = GFXFormatA8;
-   }
-   else if (color_type == PNG_COLOR_TYPE_GRAY_ALPHA) 
-   {
       png_set_expand(png_ptr);
       png_set_gray_to_rgb(png_ptr);
       format = GFXFormatR8G8B8A8;
-   }
+      break;
-   else if (color_type == PNG_COLOR_TYPE_RGB) 
+   case PNG_COLOR_TYPE_RGB:
-   {
-      format = transAlpha ? GFXFormatR8G8B8A8 : GFXFormatR8G8B8;
       png_set_expand(png_ptr);
-   }
+      format = transAlpha ? GFXFormatR8G8B8A8 : GFXFormatR8G8B8;
-   else if (color_type == PNG_COLOR_TYPE_RGB_ALPHA) 
+      break;
-   {
+   case PNG_COLOR_TYPE_RGB_ALPHA:
       png_set_expand(png_ptr);
       format = GFXFormatR8G8B8A8;
+      break;
+   default:
+      Con::errorf("_determineReadFormat - Unrecognised color_type %d.", color_type);
+      break;
    }
 
-   // Update the info pointer with the result of the transformations
+   return format;
-   //  above...
+}
-   png_read_update_info(png_ptr, info_ptr);
 
-   png_uint_32 rowBytes = png_get_rowbytes(png_ptr, info_ptr);
+static bool _validateRowBytes(const char* filename, GFXFormat format, U32 rowBytes, U32 width)
-   if (format == GFXFormatR8G8B8) 
 {
-      AssertFatal(rowBytes == width * 3,
+   const U32 expected =
-         "Error, our rowbytes are incorrect for this transform... (3)");
+      (format == GFXFormatR8G8B8) ? width * 3 :
-   }
+      (format == GFXFormatR8G8B8A8) ? width * 4 :
-   else if (format == GFXFormatR8G8B8A8) 
+      (format == GFXFormatR5G6B5) ? width * 2 : 0;
+
+   if (expected && rowBytes != expected)
    {
-      AssertFatal(rowBytes == width * 4,
+      Con::errorf("_validateRowBytes - '%s': rowBytes %d != expected %d for format %d.",
-         "Error, our rowbytes are incorrect for this transform... (4)");
+         filename, rowBytes, expected, format);
+      return false;
    }
-   else if (format == GFXFormatR5G6B5) 
-   {
-      AssertFatal(rowBytes == width * 2,
-         "Error, our rowbytes are incorrect for this transform... (2)");
-   }
-
-   // actually allocate the bitmap space...
-   bitmap->allocateBitmap(width, height,
-      false,            // don't extrude miplevels...
-      format);          // use determined format...
-
-   // Set up the row pointers...
-   png_bytep* rowPointers = new png_bytep[ height ];
-   U8* pBase = (U8*)bitmap->getBits();
-   
-   for (U32 i = 0; i < height; i++)
-      rowPointers[i] = pBase + (i * rowBytes);
-
-   // And actually read the image!
-   png_read_image(png_ptr, rowPointers);
-
-   // We're outta here, destroy the png structs, and release the lock
-   //  as quickly as possible...
-   //png_read_end(png_ptr, end_info);
-   delete [] rowPointers;
-   png_read_end(png_ptr, NULL);
-   png_destroy_read_struct(&png_ptr, &info_ptr, &end_info);
-
-   // Ok, the image is read in, now we need to finish up the initialization,
-   //  which means: setting up the detailing members, init'ing the palette
-   //  key, etc...
-   //
-   // actually, all of that was handled by allocateBitmap, so we're outta here
-   //
-
-   // Check this bitmap for transparency
-   bitmap->checkForTransparency();
-
-   FrameAllocator::setWaterMark(prevWaterMark);
-
    return true;
 }
 
-//--------------------------------------------------------------------------
+static void _applyWriteIHDR(png_structp png_ptr, png_infop info_ptr, GFXFormat format, U32 width, U32 height)
-static bool _writePNG(GBitmap *bitmap, Stream &stream, U32 compressionLevel, U32 strategy, U32 filter)
 {
-   GFXFormat   format = bitmap->getFormat();
+   switch (format)
-
-   // ONLY RGB bitmap writing supported at this time!
-   AssertFatal(   format == GFXFormatR8G8B8 || 
-                  format == GFXFormatR8G8B8A8 || 
-                  format == GFXFormatR8G8B8X8 || 
-                  format == GFXFormatA8 ||
-                  format == GFXFormatR5G6B5 ||
-                  format == GFXFormatR8G8B8A8_LINEAR_FORCE, "_writePNG: ONLY RGB bitmap writing supported at this time.");
-
-   if (  format != GFXFormatR8G8B8 && 
-         format != GFXFormatR8G8B8A8 && 
-         format != GFXFormatR8G8B8X8 && 
-         format != GFXFormatA8 &&
-         format != GFXFormatR5G6B5 && format != GFXFormatR8G8B8A8_LINEAR_FORCE)
-      return false;
-
-   png_structp png_ptr = png_create_write_struct_2(PNG_LIBPNG_VER_STRING,
-      NULL,
-      pngFatalErrorFn,
-      pngWarningFn,
-      NULL,
-      pngMallocFn,
-      pngFreeFn);
-   if (png_ptr == NULL)
-      return (false);
-
-   png_infop info_ptr = png_create_info_struct(png_ptr);
-   if (info_ptr == NULL)
    {
-      png_destroy_write_struct(&png_ptr, (png_infopp)NULL);
+   case GFXFormatR8G8B8:
-      return false;
+      png_set_IHDR(png_ptr, info_ptr, width, height, 8,
-   }
+         PNG_COLOR_TYPE_RGB, NULL, NULL, NULL);
-
+      break;
-   png_set_write_fn(png_ptr, &stream, pngWriteDataFn, pngFlushDataFn);
+   case GFXFormatR8G8B8A8:
-
+   case GFXFormatR8G8B8X8:
-   // Set the compression level and image filters
+   case GFXFormatR8G8B8A8_LINEAR_FORCE:
-   png_set_compression_window_bits(png_ptr, 15);
+      png_set_IHDR(png_ptr, info_ptr, width, height, 8,
-   png_set_compression_level(png_ptr, compressionLevel);
+         PNG_COLOR_TYPE_RGB_ALPHA, NULL, NULL, NULL);
-   png_set_filter(png_ptr, 0, filter);
+      break;
-
+   case GFXFormatA8:
-   // Set the image information here.  Width and height are up to 2^31,
+      png_set_IHDR(png_ptr, info_ptr, width, height, 8,
-   // bit_depth is one of 1, 2, 4, 8, or 16, but valid values also depend on
+         PNG_COLOR_TYPE_GRAY, NULL, NULL, NULL);
-   // the color_type selected. color_type is one of PNG_COLOR_TYPE_GRAY,
+      break;
-   // PNG_COLOR_TYPE_GRAY_ALPHA, PNG_COLOR_TYPE_PALETTE, PNG_COLOR_TYPE_RGB,
+   case GFXFormatR5G6B5:
-   // or PNG_COLOR_TYPE_RGB_ALPHA.  interlace is either PNG_INTERLACE_NONE or
-   // PNG_INTERLACE_ADAM7, and the compression_type and filter_type MUST
-   // currently be PNG_COMPRESSION_TYPE_BASE and PNG_FILTER_TYPE_BASE. REQUIRED
-
-   U32   width = bitmap->getWidth();
-   U32   height = bitmap->getHeight();
-
-   if (format == GFXFormatR8G8B8)
    {
-      png_set_IHDR(png_ptr, info_ptr,
+      png_set_IHDR(png_ptr, info_ptr, width, height, 16,
-         width, height,               // the width & height
+         PNG_COLOR_TYPE_GRAY, PNG_INTERLACE_NONE,
-         8, PNG_COLOR_TYPE_RGB,       // bit_depth, color_type,
+         PNG_COMPRESSION_TYPE_DEFAULT, PNG_FILTER_TYPE_DEFAULT);
-         NULL,                        // no interlace
-         NULL,                        // compression type
-         NULL);                       // filter type
-   }
-   else if (format == GFXFormatR8G8B8A8 || format == GFXFormatR8G8B8X8 || format == GFXFormatR8G8B8A8_LINEAR_FORCE)
-   {
-      png_set_IHDR(png_ptr, info_ptr,
-         width, height,               // the width & height
-         8, PNG_COLOR_TYPE_RGB_ALPHA, // bit_depth, color_type,
-         NULL,                        // no interlace
-         NULL,                        // compression type
-         NULL);                       // filter type
-   }
-   else if (format == GFXFormatA8)
-   {
-      png_set_IHDR(png_ptr, info_ptr,
-         width, height,               // the width & height
-         8, PNG_COLOR_TYPE_GRAY,      // bit_depth, color_type,
-         NULL,                        // no interlace
-         NULL,                        // compression type
-         NULL);                       // filter type
-   }
-   else if (format == GFXFormatR5G6B5) 
-   {
-      png_set_IHDR(png_ptr, info_ptr,
-         width, height,               // the width & height
-         16, PNG_COLOR_TYPE_GRAY,     // bit_depth, color_type,
-         PNG_INTERLACE_NONE,          // no interlace
-         PNG_COMPRESSION_TYPE_DEFAULT,   // compression type
-         PNG_FILTER_TYPE_DEFAULT);       // filter type
-      
       png_color_8_struct sigBit = { 0 };
       sigBit.gray = 16;
       png_set_sBIT(png_ptr, info_ptr, &sigBit);
-
       png_set_swap(png_ptr);
+      break;
+   }
+   default:
+      break;
+   }
 }
 
-   png_write_info(png_ptr, info_ptr);
+static bool _isSupportedWriteFormat(GFXFormat format)
-   FrameAllocatorMarker marker;
+{
-   png_bytep* row_pointers = (png_bytep*)marker.alloc( height * sizeof( png_bytep ) );
+   switch (format)
+   {
+   case GFXFormatR8G8B8:
+   case GFXFormatR8G8B8A8:
+   case GFXFormatR8G8B8X8:
+   case GFXFormatR8G8B8A8_LINEAR_FORCE:
+   case GFXFormatA8:
+   case GFXFormatR5G6B5:
+      return true;
+   default:
+      return false;
+   }
+}
+
+//-----------------------------------------------------------------------------
+// Core read / write
+//-----------------------------------------------------------------------------
+static bool _readStreamPNG(Stream& stream, GBitmap* bitmap, U32 /*len*/, const char* filename = "unknown")
+{
+   PROFILE_SCOPE(sReadPNG);
+
+   static const U32 cs_headerBytesChecked = 8;
+   U8 header[cs_headerBytesChecked];
+   stream.read(cs_headerBytesChecked, header);
+
+   if (!png_check_sig(header, cs_headerBytesChecked))
+   {
+      Con::errorf("_readStreamPNG - '%s' does not have a valid PNG signature.", filename);
+      return false;
+   }
+
+   U32 prevWaterMark = FrameAllocator::getWaterMark();
+
+   PngReadGuard guard(filename);
+   if (!guard.init())
+   {
+      FrameAllocator::setWaterMark(prevWaterMark);
+      return false;
+   }
+
+   png_set_read_fn(guard.png_ptr, &stream, pngReadDataFn);
+   png_set_sig_bytes(guard.png_ptr, cs_headerBytesChecked);
+   png_read_info(guard.png_ptr, guard.info_ptr);
+
+   bool transAlpha = false;
+   GFXFormat format = _determineReadFormat(guard.png_ptr, guard.info_ptr, transAlpha);
+
+   png_uint_32 number_of_passes = png_set_interlace_handling(guard.png_ptr);
+   png_read_update_info(guard.png_ptr, guard.info_ptr);
+
+   png_uint_32 width = png_get_image_width(guard.png_ptr, guard.info_ptr);
+   png_uint_32 height = png_get_image_height(guard.png_ptr, guard.info_ptr);
+   png_uint_32 rowBytes = png_get_rowbytes(guard.png_ptr, guard.info_ptr);
+
+   if (!_validateRowBytes(filename, format, rowBytes, width))
+   {
+      FrameAllocator::setWaterMark(prevWaterMark);
+      return false;
+   }
+
+   bitmap->deleteImage();
+   bitmap->allocateBitmap(width, height, false, format);
+
+   png_bytep* rowPointers = new png_bytep[height];
+   U8* pBase = (U8*)bitmap->getBits();
    for (U32 i = 0; i < height; i++)
-      row_pointers[i] = const_cast<png_bytep>(bitmap->getAddress(0, i));
+      rowPointers[i] = pBase + (i * rowBytes);
 
-   png_write_image(png_ptr, row_pointers);
+   png_read_image(guard.png_ptr, rowPointers);
+   delete[] rowPointers;
 
-   // Write S3TC data if present...
+   png_read_end(guard.png_ptr, NULL);
-   // Write FXT1 data if present...
-
-   png_write_end(png_ptr, info_ptr);
-   png_destroy_write_struct(&png_ptr, (png_infopp)NULL);
 
+   bitmap->checkForTransparency();
+   FrameAllocator::setWaterMark(prevWaterMark);
    return true;
 }
 
-
+static bool _writePNG(GBitmap* bitmap, Stream& stream, U32 compressionLevel, U32 strategy, U32 filter, const char* filename)
-//--------------------------------------------------------------------------
-bool sWritePNG(const Torque::Path& path, GBitmap* bitmap, U32 compressionLevel)
 {
-   FileStream* writePng = new FileStream;
+   GFXFormat format = bitmap->getFormat();
 
-   if (!writePng->open(path.getFullPath(), Torque::FS::File::Write))
+   if (!_isSupportedWriteFormat(format))
    {
-      Con::printf("Failed to open PNG :%s", path.getFullFileName().c_str());
+      Con::errorf("_writePNG - '%s': Unsupported format %d.", filename, format);
       return false;
    }
 
-   if (!sWriteStreamPNG("png", *writePng, bitmap, compressionLevel))
+   PngWriteGuard guard(filename);
-   {
+   if (!guard.init(true))
-      Con::printf("Failed to write PNG :%s", path.getFullFileName().c_str());
       return false;
-   }
 
-   writePng->close();
+   png_set_write_fn(guard.png_ptr, &stream, pngWriteDataFn, pngFlushDataFn);
+   png_set_compression_window_bits(guard.png_ptr, 15);
+   png_set_compression_level(guard.png_ptr, compressionLevel);
+   png_set_filter(guard.png_ptr, 0, filter);
 
+   _applyWriteIHDR(guard.png_ptr, guard.info_ptr, format, bitmap->getWidth(), bitmap->getHeight());
+   png_write_info(guard.png_ptr, guard.info_ptr);
+
+   FrameAllocatorMarker marker;
+   const U32 height = bitmap->getHeight();
+   png_bytep* rowPointers = (png_bytep*)marker.alloc(height * sizeof(png_bytep));
+   for (U32 i = 0; i < height; i++)
+      rowPointers[i] = const_cast<png_bytep>(bitmap->getAddress(0, i));
+
+   png_write_image(guard.png_ptr, rowPointers);
+   png_write_end(guard.png_ptr, guard.info_ptr);
    return true;
 }
 
-static bool sWriteStreamPNG(const String& bmType, Stream& stream, GBitmap* bitmap, U32 compressionLevel)
+//-----------------------------------------------------------------------------
+// Public interface
+//-----------------------------------------------------------------------------
+static bool sReadPNG(const Torque::Path& path, GBitmap* bitmap)
+{
+   FileStream readPng;
+   if (!readPng.open(path.getFullPath(), Torque::FS::File::Read))
+   {
+      Con::errorf("sReadPNG - Failed to open '%s'.", path.getFullPath().c_str());
+      return false;
+   }
+
+   bool result = _readStreamPNG(readPng, bitmap, U32_MAX, path.getFullPath().c_str());
+   if (!result)
+      Con::errorf("sReadPNG - Failed to decode '%s'.", path.getFullPath().c_str());
+
+   readPng.close();
+   return result;
+}
+
+static bool sWriteStreamPNG(const String& /*bmType*/, Stream& stream, GBitmap* bitmap, U32 compressionLevel)
 {
    U32 waterMark = FrameAllocator::getWaterMark();
 
@@ -501,19 +471,11 @@ static bool sWriteStreamPNG(const String& bmType, Stream& stream, GBitmap* bitma
    U8* buffer = new U8[1 << 22]; // 4 Megs.  Should be enough...
    MemStream* pMemStream = new MemStream(1 << 22, buffer, false, true);
 
-   const U32 zStrategies[] = { Z_DEFAULT_STRATEGY,
+   const U32 zStrategies[] = { Z_DEFAULT_STRATEGY, Z_FILTERED };
-      Z_FILTERED };
+   const U32 pngFilters[] = { PNG_FILTER_NONE, PNG_FILTER_SUB, PNG_FILTER_UP,
-   const U32 pngFilters[]  = { PNG_FILTER_NONE,
+                                PNG_FILTER_AVG, PNG_FILTER_PAETH, PNG_ALL_FILTERS };
-      PNG_FILTER_SUB,
-      PNG_FILTER_UP,
-      PNG_FILTER_AVG,
-      PNG_FILTER_PAETH,
-      PNG_ALL_FILTERS };
 
-   U32 minSize      = 0xFFFFFFFF;
+   U32 minSize = U32_MAX, bestCLevel = 0, bestStrategy = 0, bestFilter = 0;
-   U32 bestStrategy = 0xFFFFFFFF;
-   U32 bestFilter   = 0xFFFFFFFF;
-   U32 bestCLevel   = 0xFFFFFFFF;
 
    for (U32 cl = 0; cl <= 9; cl++)
    {
@@ -522,53 +484,78 @@ static bool sWriteStreamPNG(const String& bmType, Stream& stream, GBitmap* bitma
          for (U32 pf = 0; pf < 6; pf++)
          {
             pMemStream->setPosition(0);
-
             U32 waterMarkInner = FrameAllocator::getWaterMark();
 
-            if (_writePNG(bitmap, *pMemStream, cl, zStrategies[zs], pngFilters[pf]) == false)
+            if (!_writePNG(bitmap, *pMemStream, cl, zStrategies[zs], pngFilters[pf]))
-               AssertFatal(false, "Handle this error!");
+            {
+               Con::errorf("sWriteStreamPNG - Compression search failed at cl=%d zs=%d pf=%d.", cl, zs, pf);
+               FrameAllocator::setWaterMark(waterMarkInner);
+               continue;
+            }
 
             FrameAllocator::setWaterMark(waterMarkInner);
 
             if (pMemStream->getPosition() < minSize)
             {
                minSize = pMemStream->getPosition();
-               bestStrategy = zs;
+               bestCLevel = cl; bestStrategy = zs; bestFilter = pf;
-               bestFilter   = pf;
-               bestCLevel   = cl;
             }
          }
       }
    }
-   AssertFatal(minSize != 0xFFFFFFFF, "Error, no best found?");
 
    delete pMemStream;
    delete[] buffer;
 
-
+   if (minSize == U32_MAX)
-   bool retVal = _writePNG(bitmap, stream,
+   {
-      bestCLevel,
+      Con::errorf("sWriteStreamPNG - No valid compression result found.");
-      zStrategies[bestStrategy],
-      pngFilters[bestFilter]);
       FrameAllocator::setWaterMark(waterMark);
+      return false;
+   }
 
+   bool retVal = _writePNG(bitmap, stream, bestCLevel, zStrategies[bestStrategy], pngFilters[bestFilter]);
+   FrameAllocator::setWaterMark(waterMark);
    return retVal;
 }
 
-//--------------------------------------------------------------------------
+static bool sWritePNG(const Torque::Path& path, GBitmap* bitmap, U32 compressionLevel)
-// Stores PNG stream data
-struct DeferredPNGWriterData {
-   png_structp png_ptr;
-   png_infop info_ptr;
-   U32 width;
-   U32 height;   
-};
-DeferredPNGWriter::DeferredPNGWriter() : 
-   mData( NULL ),
-   mActive(false)
 {
-   mData = new DeferredPNGWriterData();
+   FileStream writePng;
+   if (!writePng.open(path.getFullPath(), Torque::FS::File::Write))
+   {
+      Con::errorf("sWritePNG - Failed to open '%s' for writing.", path.getFullPath().c_str());
+      return false;
    }
+
+   bool retVal = sWriteStreamPNG("png", writePng, bitmap, compressionLevel);
+   if (!retVal)
+      Con::errorf("sWritePNG - Failed to encode '%s'. Format: %d, Size: %dx%d.",
+         path.getFullPath().c_str(), bitmap->getFormat(), bitmap->getWidth(), bitmap->getHeight());
+
+   writePng.close();
+   return retVal;
+}
+
+static bool sReadStreamPNG(Stream& stream, GBitmap* bitmap, U32 len)
+{
+   return _readStreamPNG(stream, bitmap, len, "unknown (stream only)");
+}
+
+//-----------------------------------------------------------------------------
+// DeferredPNGWriter
+//-----------------------------------------------------------------------------
+struct DeferredPNGWriterData
+{
+   PngWriteGuard guard;
+   U32 width = 0;
+   U32 height = 0;
+
+   explicit DeferredPNGWriterData(const char* filename) : guard(filename) {}
+};
+
+DeferredPNGWriter::DeferredPNGWriter() : mData(nullptr), mActive(false) {}
+
 DeferredPNGWriter::~DeferredPNGWriter()
 {
    delete mData;
@@ -576,120 +563,52 @@ DeferredPNGWriter::~DeferredPNGWriter()
 
 bool DeferredPNGWriter::begin(GFXFormat format, S32 width, S32 height, Stream& stream, U32 compressionLevel)
 {
-   // ONLY RGB bitmap writing supported at this time!
+   if (!_isSupportedWriteFormat(format))
-   AssertFatal(   format == GFXFormatR8G8B8 || 
-                  format == GFXFormatR8G8B8A8 || 
-                  format == GFXFormatR8G8B8X8 || 
-                  format == GFXFormatA8 ||
-                  format == GFXFormatR5G6B5, "_writePNG: ONLY RGB bitmap writing supported at this time.");
-
-   if (  format != GFXFormatR8G8B8 && 
-         format != GFXFormatR8G8B8A8 && 
-         format != GFXFormatR8G8B8X8 && 
-         format != GFXFormatA8 &&
-         format != GFXFormatR5G6B5 )
-      return false;
-
-   mData->png_ptr = png_create_write_struct_2(PNG_LIBPNG_VER_STRING,
-      NULL,
-      pngFatalErrorFn,
-      pngWarningFn,
-      NULL,
-      pngRealMallocFn,
-      pngRealFreeFn);
-   if (mData->png_ptr == NULL)
-      return (false);
-
-   mData->info_ptr = png_create_info_struct(mData->png_ptr);
-   if (mData->info_ptr == NULL)
    {
-      png_destroy_write_struct(&mData->png_ptr, (png_infopp)NULL);
+      Con::errorf("DeferredPNGWriter::begin - Unsupported format %d.", format);
       return false;
    }
 
-   png_set_write_fn(mData->png_ptr, &stream, pngWriteDataFn, pngFlushDataFn);
+   mData = new DeferredPNGWriterData("DeferredPNGWriter");
 
-   // Set the compression level and image filters
+   if (!mData->guard.init(false))
-   png_set_compression_window_bits(mData->png_ptr, 15);
-   png_set_compression_level(mData->png_ptr, compressionLevel);
-   png_set_filter(mData->png_ptr, 0, PNG_ALL_FILTERS);
-
-   // Set the image information here.  Width and height are up to 2^31,
-   // bit_depth is one of 1, 2, 4, 8, or 16, but valid values also depend on
-   // the color_type selected. color_type is one of PNG_COLOR_TYPE_GRAY,
-   // PNG_COLOR_TYPE_GRAY_ALPHA, PNG_COLOR_TYPE_PALETTE, PNG_COLOR_TYPE_RGB,
-   // or PNG_COLOR_TYPE_RGB_ALPHA.  interlace is either PNG_INTERLACE_NONE or
-   // PNG_INTERLACE_ADAM7, and the compression_type and filter_type MUST
-   // currently be PNG_COMPRESSION_TYPE_BASE and PNG_FILTER_TYPE_BASE. REQUIRED
-   
-   if (format == GFXFormatR8G8B8)
    {
-      png_set_IHDR(mData->png_ptr, mData->info_ptr,
+      Con::errorf("DeferredPNGWriter::begin - Failed to init PNG write structs. Format: %d, Size: %dx%d.", format, width, height);
-         width, height,               // the width & height
+      return false;
-         8, PNG_COLOR_TYPE_RGB,       // bit_depth, color_type,
-         NULL,                        // no interlace
-         NULL,                        // compression type
-         NULL);                       // filter type
-   }
-   else if (format == GFXFormatR8G8B8A8 || format == GFXFormatR8G8B8X8)
-   {
-      png_set_IHDR(mData->png_ptr, mData->info_ptr,
-         width, height,               // the width & height
-         8, PNG_COLOR_TYPE_RGB_ALPHA, // bit_depth, color_type,
-         NULL,                        // no interlace
-         NULL,                        // compression type
-         NULL);                       // filter type
-   }
-   else if (format == GFXFormatA8)
-   {
-      png_set_IHDR(mData->png_ptr, mData->info_ptr,
-         width, height,               // the width & height
-         8, PNG_COLOR_TYPE_GRAY,      // bit_depth, color_type,
-         NULL,                        // no interlace
-         NULL,                        // compression type
-         NULL);                       // filter type
-   }
-   else if (format == GFXFormatR5G6B5) 
-   {
-      png_set_IHDR(mData->png_ptr, mData->info_ptr,
-         width, height,               // the width & height
-         16, PNG_COLOR_TYPE_GRAY,     // bit_depth, color_type,
-         PNG_INTERLACE_NONE,          // no interlace
-         PNG_COMPRESSION_TYPE_DEFAULT,   // compression type
-         PNG_FILTER_TYPE_DEFAULT);       // filter type
-      
-      png_color_8_struct sigBit = { 0 };
-      sigBit.gray = 16;
-      png_set_sBIT(mData->png_ptr, mData->info_ptr, &sigBit );
-
-      png_set_swap( mData->png_ptr );
    }
 
-   png_write_info(mData->png_ptr, mData->info_ptr);
+   mData->width = width;
+   mData->height = height;
+
+   png_set_write_fn(mData->guard.png_ptr, &stream, pngWriteDataFn, pngFlushDataFn);
+   png_set_compression_window_bits(mData->guard.png_ptr, 15);
+   png_set_compression_level(mData->guard.png_ptr, compressionLevel);
+   png_set_filter(mData->guard.png_ptr, 0, PNG_ALL_FILTERS);
+
+   _applyWriteIHDR(mData->guard.png_ptr, mData->guard.info_ptr, format, width, height);
+   png_write_info(mData->guard.png_ptr, mData->guard.info_ptr);
 
    mActive = true;
-
    return true;
 }
+
 void DeferredPNGWriter::append(GBitmap* bitmap, U32 rows)
 {
-   AssertFatal(mActive, "Cannot append to an inactive DeferredPNGWriter!");
+   AssertFatal(mActive, "DeferredPNGWriter::append - Writer is not active.");
 
    U32 height = getMin(bitmap->getHeight(), rows);
-
    FrameAllocatorMarker marker;
    png_bytep* row_pointers = (png_bytep*)marker.alloc(height * sizeof(png_bytep));
    for (U32 i = 0; i < height; i++)
       row_pointers[i] = const_cast<png_bytep>(bitmap->getAddress(0, i));
 
-   png_write_rows(mData->png_ptr, row_pointers, height);
+   png_write_rows(mData->guard.png_ptr, row_pointers, height);
 }
+
 void DeferredPNGWriter::end()
 {
-   AssertFatal(mActive, "Cannot end an inactive DeferredPNGWriter!");
+   AssertFatal(mActive, "DeferredPNGWriter::end - Writer is not active.");
-
-   png_write_end(mData->png_ptr, mData->info_ptr);
-   png_destroy_write_struct(&mData->png_ptr, (png_infopp)NULL);
 
+   png_write_end(mData->guard.png_ptr, mData->guard.info_ptr);
    mActive = false;
 }

Engine/source/gfx/gl/gfxGLDevice.cpp

@@ -57,6 +57,24 @@
 #include "gfx/gl/tGL/tXGL.h"
 #endif
 
+#pragma region GL WARNINGS
+
+// #131204 - Texture state usage warning: The texture object (0) bound to texture image unit 0
+#define GL_LOW_WARN_TEXTURE_STATE 131204
+
+// #131169 - Framebuffer detailed info: The driver allocated storage for renderbuffer 2. (severity: low)
+#define GL_LOW_WARN_FRAMEBUFFER 131169
+
+// #131185 - Buffer detailed info: Buffer object 1 (bound to GL_ELEMENT_ARRAY_BUFFER_ARB, usage hint is GL_ENUM_88e4)
+//           will use VIDEO memory as the source for buffer object operations. (severity: low)
+#define GL_LOW_WARN_VIDEO_MEMORY 131185
+
+// #131218 - Program/shader state performance warning: Vertex shader in program #
+//           is being recompiled based on GL state. (severity: medium)
+#define GL_MED_WARN_PERFORMANCE_RECOMPILE 131218
+
+#pragma endregion
+
 GFXAdapter::CreateDeviceInstanceDelegate GFXGLDevice::mCreateDeviceInstance(GFXGLDevice::createInstance);
 
 GFXDevice *GFXGLDevice::createInstance( U32 adapterIndex )
@@ -104,6 +122,10 @@ void APIENTRY glDebugCallback(
     if (severity == GL_DEBUG_SEVERITY_NOTIFICATION)
         return;
 
+    // Silence: Texture state usage warning: The texture object (0) bound to texture image unit 0
+    if (id == GL_LOW_WARN_TEXTURE_STATE)
+       return;
+
     const char* srcStr = "UNKNOWN";
     const char* typeStr = "UNKNOWN";
     const char* sevStr = "UNKNOWN";

Engine/source/gfx/gl/gfxGLTextureManager.cpp

@@ -480,10 +480,9 @@ bool GFXGLTextureManager::_loadTexture(GFXTextureObject *aTexture, GBitmap *pDL)
       }
    }
 
-   if(!ImageUtil::isCompressedFormat(pDL->getFormat()))
+   if (mipLevels > 1 && !ImageUtil::isCompressedFormat(pDL->getFormat()))
       glGenerateMipmap(texture->getBinding());
 
-   glBindTexture(target, 0);
    return true;
 }
 
@@ -560,10 +559,9 @@ bool GFXGLTextureManager::_loadTexture(GFXTextureObject *aTexture, DDSFile *dds)
       }
    }
 
-   if (numMips != 1 && !isCompressed)
+   if (numMips > 1 && !isCompressed)
       glGenerateMipmap(texture->getBinding());
 
-   glBindTexture(target, 0);
    return true;
 }
 
@@ -608,7 +606,7 @@ bool GFXGLTextureManager::_refreshTexture(GFXTextureObject *texture)
          _loadTexture(texture, texture->mBitmap);
       
       if(texture->mDDS)
-         return false;
+         _loadTexture(texture, texture->mDDS);
       
       usedStrategies++;
    }

Engine/source/gfx/gl/gfxGLTextureObject.cpp

@@ -105,76 +105,33 @@ void GFXGLTextureObject::unlock(U32 mipLevel /*= 0*/, U32 faceIndex /*= 0*/)
    if (!mLockedRect.bits)
       return;
 
-    PROFILE_SCOPE(GFXGLTextureObject_unlock);
+   // I know this is in unlock, but in GL we actually do our submission in unlock.
+   PROFILE_SCOPE(GFXGLTextureObject_lockRT);
 
    PRESERVE_TEXTURE(mBinding);
    glBindTexture(mBinding, mHandle);
-
+   glBindBuffer(GL_PIXEL_UNPACK_BUFFER, mBuffer);
-    // --- Save pixel store state ---
+   glBufferData(GL_PIXEL_UNPACK_BUFFER, (mLockedRectRect.extent.x + 1) * (mLockedRectRect.extent.y + 1) * mBytesPerTexel, mFrameAllocatorPtr, GL_STREAM_DRAW);
-    GLint prevUnpackAlign;
+   S32 z = getDepth();
-    glGetIntegerv(GL_UNPACK_ALIGNMENT, &prevUnpackAlign);
-
-    glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
-
-    const U32 width  = mLockedRectRect.extent.x;
-    const U32 height = mLockedRectRect.extent.y;
-    const U32 depth  = getDepth();
-
    if (mBinding == GL_TEXTURE_3D)
-    {
+      glTexSubImage3D(mBinding, mipLevel, mLockedRectRect.point.x, mLockedRectRect.point.y, z,
-        glTexSubImage3D(
+         mLockedRectRect.extent.x, mLockedRectRect.extent.y, z, GFXGLTextureFormat[mFormat], GFXGLTextureType[mFormat], NULL);
-            mBinding,
-            mipLevel,
-            mLockedRectRect.point.x,
-            mLockedRectRect.point.y,
-            0,
-            width,
-            height,
-            depth,
-            GFXGLTextureFormat[mFormat],
-            GFXGLTextureType[mFormat],
-            mLockedRect.bits
-        );
-    }
    else if (mBinding == GL_TEXTURE_2D)
-    {
+      glTexSubImage2D(mBinding, mipLevel, mLockedRectRect.point.x, mLockedRectRect.point.y,
-        glTexSubImage2D(
+         mLockedRectRect.extent.x, mLockedRectRect.extent.y, GFXGLTextureFormat[mFormat], GFXGLTextureType[mFormat], NULL);
-            mBinding,
-            mipLevel,
-            mLockedRectRect.point.x,
-            mLockedRectRect.point.y,
-            width,
-            height,
-            GFXGLTextureFormat[mFormat],
-            GFXGLTextureType[mFormat],
-            mLockedRect.bits
-        );
-    }
    else if (mBinding == GL_TEXTURE_1D)
-    {
+      glTexSubImage1D(mBinding, mipLevel, (mLockedRectRect.point.x > 1 ? mLockedRectRect.point.x : mLockedRectRect.point.y),
-        glTexSubImage1D(
+         (mLockedRectRect.extent.x > 1 ? mLockedRectRect.extent.x : mLockedRectRect.extent.y), GFXGLTextureFormat[mFormat], GFXGLTextureType[mFormat], NULL);
-            mBinding,
-            mipLevel,
-            mLockedRectRect.point.x,
-            width,
-            GFXGLTextureFormat[mFormat],
-            GFXGLTextureType[mFormat],
-            mLockedRect.bits
-        );
-    }
 
-    // --- Restore state ---
+   glBindBuffer(GL_PIXEL_UNPACK_BUFFER, 0);
-    glPixelStorei(GL_UNPACK_ALIGNMENT, prevUnpackAlign);
 
    mLockedRect.bits = NULL;
-
+#if TORQUE_DEBUG
+   AssertFatal(mFrameAllocatorMarkGuard == FrameAllocator::getWaterMark(), "");
+#endif
    FrameAllocator::setWaterMark(mFrameAllocatorMark);
    mFrameAllocatorMark = 0;
    mFrameAllocatorPtr = NULL;
-   
-#ifdef TORQUE_DEBUG
-   glCheckErrors();
-#endif
 }
 
 void GFXGLTextureObject::release()
@@ -281,7 +238,6 @@ bool GFXGLTextureObject::copyToBmp(GBitmap * bmp)
       } // face
    } // mip
 
-   glBindTexture(mBinding, 0);
    return true;
 }
 
@@ -298,6 +254,9 @@ void GFXGLTextureObject::updateTextureSlot(const GFXTexHandle& texHandle, const
    const GLenum srcTarget = srcTex->getBinding(); // source binding
    const bool srcIsCube = (srcTarget == GL_TEXTURE_CUBE_MAP || srcTarget == GL_TEXTURE_CUBE_MAP_ARRAY);
 
+   PRESERVE_TEXTURE(srcTarget);
+   PRESERVE_TEXTURE(dstTarget);
+
    // Determine list of faces to copy from source
    U32 firstFace = 0;
    U32 faceCount = 1;
@@ -435,9 +394,6 @@ void GFXGLTextureObject::updateTextureSlot(const GFXTexHandle& texHandle, const
                GFXGLTextureFormat[mFormat], GFXGLTextureType[mFormat], buffer);
          }
       }
-
-      glBindTexture(dstTarget, 0);
-      glBindTexture(srcTarget, 0);
    }
 }
 
@@ -462,6 +418,9 @@ void GFXGLTextureObject::initSamplerState(const GFXSamplerStateDesc &ssd)
 
 void GFXGLTextureObject::bind(U32 textureUnit)
 {
+   if (!mHandle || mIsZombie)
+      return;
+
    glActiveTexture(GL_TEXTURE0 + textureUnit);
    glBindTexture(mBinding, mHandle);
    GFXGL->getOpenglCache()->setCacheBindedTex(textureUnit, mBinding, mHandle);