Add -alpha option. Get things ready for 2.0.8 revision.

VERSION

@@ -1 +1 @@
-2.0.7
+2.0.8

src/nvimage/DirectDrawSurface.cpp

@@ -532,7 +532,7 @@ DDSHeader::DDSHeader()
 
 	// Store version information on the reserved header attributes.
 	this->reserved[9] = MAKEFOURCC('N', 'V', 'T', 'T');
-	this->reserved[10] = (2 << 16) | (0 << 8) | (7);	// major.minor.revision
+	this->reserved[10] = (2 << 16) | (0 << 8) | (8);	// major.minor.revision
 
 	this->pf.size = 32;
 	this->pf.flags = 0;

src/nvtt/tools/compress.cpp

@@ -134,6 +134,7 @@ int main(int argc, char *argv[])
 	MyAssertHandler assertHandler;
 	MyMessageHandler messageHandler;
 
+	bool alpha = false;
 	bool normal = false;
 	bool color2normal = false;
 	bool wrapRepeat = false;
@@ -157,6 +158,10 @@ int main(int argc, char *argv[])
 		if (strcmp("-color", argv[i]) == 0)
 		{
 		}
+		else if (strcmp("-alpha", argv[i]) == 0)
+		{
+			alpha = true;
+		}
 		else if (strcmp("-normal", argv[i]) == 0)
 		{
 			normal = true;
@@ -270,6 +275,7 @@ int main(int argc, char *argv[])
 		
 		printf("Input options:\n");
 		printf("  -color   \tThe input image is a color map (default).\n");
+		printf("  -alpha     \tThe input image has an alpha channel used for transparency.\n");		
 		printf("  -normal  \tThe input image is a normal map.\n");
 		printf("  -tonormal\tConvert input to normal map.\n");
 		printf("  -clamp   \tClamp wrapping mode (default).\n");
@@ -363,6 +369,15 @@ int main(int argc, char *argv[])
 		inputOptions.setWrapMode(nvtt::WrapMode_Clamp);
 	}
 
+	if (alpha)
+	{
+		inputOptions.setAlphaMode(nvtt::AlphaMode_Transparency);
+	}
+	else
+	{
+		inputOptions.setAlphaMode(nvtt::AlphaMode_None);
+	}
+
 	if (normal)
 	{
 		setNormalMap(inputOptions);