Fix pixel unpack buffers for some formats.

src/libANGLE/angletypes.h

@@ -75,6 +75,8 @@ struct Extents
 
     Extents() : width(0), height(0), depth(0) { }
     Extents(int width_, int height_, int depth_) : width(width_), height(height_), depth(depth_) { }
+
+    bool empty() const { return (width * height * depth) == 0; }
 };
 
 struct Box

src/libANGLE/renderer/d3d/TextureD3D.cpp

@@ -1790,7 +1790,7 @@ gl::Error TextureD3D_3D::setImage(GLenum target, size_t level, GLenum internalFo
     gl::ImageIndex index = gl::ImageIndex::Make3D(level);
 
     // Attempt a fast gpu copy of the pixel data to the surface if the app bound an unpack buffer
-    if (isFastUnpackable(unpack, sizedInternalFormat))
+    if (isFastUnpackable(unpack, sizedInternalFormat) && !size.empty())
     {
         // Will try to create RT storage if it does not exist
         RenderTarget *destRenderTarget = NULL;

src/libANGLE/renderer/d3d/d3d11/Renderer11.cpp

@@ -2740,7 +2740,7 @@ bool Renderer11::supportsFastCopyBufferToTexture(GLenum internalFormat) const
     }
 
     // We cannot support direct copies to non-color-renderable formats
-    if (d3d11FormatInfo.rtvFormat != DXGI_FORMAT_UNKNOWN)
+    if (d3d11FormatInfo.rtvFormat == DXGI_FORMAT_UNKNOWN)
     {
         return false;
     }