Add BC6 support to nvtt lib and utils.

- Use 3x3 eigensolver for initial fit in ZOH.  Slightly better perf and RMSE than power method.
- Remove use of double precision in ZOH - speeds up by 12%.
- Fixed RGBM encoding that was broken for HDR images.
- Use gamma-2.0 space for RGBM for HDR images (improves precision in darks).
- Use UNORM instead of TYPELESS formats when saving a DX10 .dds file.  The TYPELESS formats break most viewers.
- Cleaned up warnings in ZOH code.
- Command-line utils will warn if you give them an unrecognized parameter.
- Added VS2010 profiling results.

src/nvtt/tools/assemble.cpp

@@ -83,6 +83,10 @@ int main(int argc, char *argv[])
 		{
 			files.append(argv[i]);
 		}
+		else
+		{
+			printf("Warning: unrecognized option \"%s\"\n", argv[i]);
+		}
 	}
 	
 	if (files.count() == 0)

src/nvtt/tools/compress.cpp

@@ -261,6 +261,15 @@ int main(int argc, char *argv[])
         {
             format = nvtt::Format_BC5;
         }
+        else if (strcmp("-bc6", argv[i]) == 0)
+        {
+            format = nvtt::Format_BC6;
+        }
+		// !!!UNDONE: add BC7 support
+        /*else if (strcmp("-bc7", argv[i]) == 0)
+        {
+            format = nvtt::Format_BC7;
+        }*/
 
         // Undocumented option. Mainly used for testing.
         else if (strcmp("-ext", argv[i]) == 0)
@@ -302,6 +311,10 @@ int main(int argc, char *argv[])
 
             break;
         }
+		else
+		{
+			printf("Warning: unrecognized option \"%s\"\n", argv[i]);
+		}
     }
 
     const uint version = nvtt::version();
@@ -314,7 +327,7 @@ int main(int argc, char *argv[])
 
     if (input.isNull())
     {
-        printf("usage: nvcompress [options] infile [outfile]\n\n");
+        printf("usage: nvcompress [options] infile [outfile.dds]\n\n");
 
         printf("Input options:\n");
         printf("  -color     \tThe input image is a color map (default).\n");
@@ -340,11 +353,13 @@ int main(int argc, char *argv[])
         printf("  -bc3     \tBC3 format (DXT5)\n");
         printf("  -bc3n    \tBC3 normal map format (DXT5nm)\n");
         printf("  -bc4     \tBC4 format (ATI1)\n");
-        printf("  -bc5     \tBC5 format (3Dc/ATI2)\n\n");
+        printf("  -bc5     \tBC5 format (3Dc/ATI2)\n");
+        printf("  -bc6     \tBC6 format\n");
+        //printf("  -bc7     \tBC7 format\n\n");
 
         printf("Output options:\n");
         printf("  -silent  \tDo not output progress messages\n");
-        printf("  -dds10   \tUse DirectX 10 DDS format\n\n");
+        printf("  -dds10   \tUse DirectX 10 DDS format (enabled by default for BC6/7)\n\n");
 
         return EXIT_FAILURE;
     }
@@ -581,6 +596,12 @@ int main(int argc, char *argv[])
     outputOptions.setOutputHandler(&outputHandler);
     outputOptions.setErrorHandler(&errorHandler);
 
+	// Automatically use dds10 if compressing to BC6 or BC7
+	if (format == nvtt::Format_BC6 || format == nvtt::Format_BC7)
+	{
+		dds10 = true;
+	}
+
     if (dds10)
     {
         outputOptions.setContainer(nvtt::Container_DDS10);

src/nvtt/tools/decompress.cpp

@@ -66,6 +66,8 @@ int main(int argc, char *argv[])
 			if (i+1 == argc) break;
 			i++;
 
+			// !!!UNDONE: Support at least one HDR output format
+
 #ifdef HAVE_PNG
 			if (strcmp("png", argv[i]) == 0) savePNG = true;
 			else 
@@ -92,13 +94,17 @@ int main(int argc, char *argv[])
 
 			break;
 		}
+		else
+		{
+			printf("Warning: unrecognized option \"%s\"\n", argv[i]);
+		}
 	}
 	
 	printf("NVIDIA Texture Tools - Copyright NVIDIA Corporation 2007\n\n");
 
 	if (input.isNull())
 	{
-		printf("usage: nvdecompress [options] infile [outfile]\n\n");
+		printf("usage: nvdecompress [options] infile.dds [outfile]\n\n");
 
 		printf("Note: the .tga or .png extension is forced on outfile\n\n");
 
@@ -112,6 +118,8 @@ int main(int argc, char *argv[])
  	}
 
 	// Load surface.
+	// !!! DirectDrawSurface API doesn't support float images, so BC6 will be converted to 8-bit on load.
+	// Should use nvtt::Surface instead.
 	nv::DirectDrawSurface dds(input.str());
 	if (!dds.isValid())
 	{

src/nvtt/tools/imgdiff.cpp

@@ -182,11 +182,10 @@ int main(int argc, char *argv[])
 		{
 			compareNormal = true;
 		}
-		if (strcmp("-alpha", argv[i]) == 0)
+		else if (strcmp("-alpha", argv[i]) == 0)
 		{
 			compareAlpha = true;
 		}
-
 		else if (argv[i][0] != '-')
 		{
 			input0 = argv[i];
@@ -197,6 +196,10 @@ int main(int argc, char *argv[])
 
 			break;
 		}
+		else
+		{
+			printf("Warning: unrecognized option \"%s\"\n", argv[i]);
+		}
 	}
 
 	if (input0.isNull() || input1.isNull())

src/nvtt/tools/resize.cpp

@@ -131,6 +131,10 @@ int main(int argc, char *argv[])
 
 			break;
 		}
+		else
+		{
+			printf("Warning: unrecognized option \"%s\"\n", argv[i]);
+		}
 	}
 
 	if (input.isNull() || output.isNull())