diff --git a/src/nvimage/DirectDrawSurface.cpp b/src/nvimage/DirectDrawSurface.cpp
index e7d6ee6..a0d1eec 100644
--- a/src/nvimage/DirectDrawSurface.cpp
+++ b/src/nvimage/DirectDrawSurface.cpp
@@ -654,6 +654,20 @@ void DDSHeader::setFourCC(uint8 c0, uint8 c1, uint8 c2, uint8 c3)
 	this->pf.amask = 0;
 }
 
+void DDSHeader::setFormatCode(uint32 code)
+{
+	// set fourcc pixel format.
+	this->pf.flags = DDPF_FOURCC;
+	this->pf.fourcc = code;
+	
+	this->pf.bitcount = 0;
+	this->pf.rmask = 0;
+	this->pf.gmask = 0;
+	this->pf.bmask = 0;
+	this->pf.amask = 0;
+}
+
+
 void DDSHeader::setPixelFormat(uint bitcount, uint rmask, uint gmask, uint bmask, uint amask)
 {
 	// Make sure the masks are correct.
diff --git a/src/nvimage/DirectDrawSurface.h b/src/nvimage/DirectDrawSurface.h
index c56967f..c5fea9c 100644
--- a/src/nvimage/DirectDrawSurface.h
+++ b/src/nvimage/DirectDrawSurface.h
@@ -93,6 +93,7 @@ namespace nv
 		void setLinearSize(uint size);
 		void setPitch(uint pitch);
 		void setFourCC(uint8 c0, uint8 c1, uint8 c2, uint8 c3);
+		void setFormatCode(uint code);
 		void setPixelFormat(uint bitcount, uint rmask, uint gmask, uint bmask, uint amask);
 		void setDX10Format(uint format);
 		void setNormalFlag(bool b);
diff --git a/src/nvimage/FloatImage.cpp b/src/nvimage/FloatImage.cpp
index 40ac8b2..7bb191d 100644
--- a/src/nvimage/FloatImage.cpp
+++ b/src/nvimage/FloatImage.cpp
@@ -141,7 +141,8 @@ Image * FloatImage::createImageGammaCorrect(float gamma/*= 2.2f*/) const
 /// Allocate a 2d float image of the given format and the given extents.
 void FloatImage::allocate(uint c, uint w, uint h)
 {
-	nvCheck(m_mem == NULL);
+	free();
+
 	m_width = w;
 	m_height = h;
 	m_componentNum = c;
@@ -152,7 +153,6 @@ void FloatImage::allocate(uint c, uint w, uint h)
 /// Free the image, but don't clear the members.
 void FloatImage::free()
 {
-	nvCheck(m_mem != NULL);
 	nv::mem::free( reinterpret_cast<void *>(m_mem) );
 	m_mem = NULL;
 }
diff --git a/src/nvimage/Image.cpp b/src/nvimage/Image.cpp
index 6830992..77f7bc8 100644
--- a/src/nvimage/Image.cpp
+++ b/src/nvimage/Image.cpp
@@ -39,9 +39,10 @@ const Image & Image::operator=(const Image & img)
 
 void Image::allocate(uint w, uint h)
 {
+	free();
 	m_width = w;
 	m_height = h;
-	m_data = (Color32 *)realloc(m_data, w * h * sizeof(Color32));
+	m_data = (Color32 *)nv::mem::malloc(w * h * sizeof(Color32));
 }
 
 bool Image::load(const char * name)
diff --git a/src/nvtt/CompressRGB.cpp b/src/nvtt/CompressRGB.cpp
index f45f5b6..136c703 100644
--- a/src/nvtt/CompressRGB.cpp
+++ b/src/nvtt/CompressRGB.cpp
@@ -24,6 +24,7 @@
 #include <nvcore/Debug.h>
 
 #include <nvimage/Image.h>
+#include <nvimage/FloatImage.h>
 #include <nvimage/PixelFormat.h>
 #include <nvmath/Color.h>
 
@@ -66,29 +67,53 @@ void nv::compressRGB(const Image * image, const OutputOptions::Private & outputO
 	const uint w = image->width();
 	const uint h = image->height();
 
-	const uint bitCount = compressionOptions.bitcount;
-	nvCheck(bitCount == 8 || bitCount == 16 || bitCount == 24 || bitCount == 32);
+	uint bitCount;
+	uint rmask, rshift, rsize;
+	uint gmask, gshift, gsize;
+	uint bmask, bshift, bsize;
+	uint amask, ashift, asize;
+
+	if (compressionOptions.bitcount != 0)
+	{
+		bitCount = compressionOptions.bitcount;
+		nvCheck(bitCount == 8 || bitCount == 16 || bitCount == 24 || bitCount == 32);
+
+		rmask = compressionOptions.rmask;
+		gmask = compressionOptions.gmask;
+		bmask = compressionOptions.bmask;
+		amask = compressionOptions.amask;
+
+		PixelFormat::maskShiftAndSize(rmask, &rshift, &rsize);
+		PixelFormat::maskShiftAndSize(gmask, &gshift, &gsize);
+		PixelFormat::maskShiftAndSize(bmask, &bshift, &bsize);
+		PixelFormat::maskShiftAndSize(amask, &ashift, &asize);
+	}
+	else
+	{
+		rsize = compressionOptions.rsize;
+		gsize = compressionOptions.gsize;
+		bsize = compressionOptions.bsize;
+		asize = compressionOptions.asize;
+
+		bitCount = rsize + gsize + bsize + asize;
+		nvCheck(bitCount <= 32);
+
+		ashift = 0;
+		bshift = ashift + asize;
+		gshift = bshift + bsize;
+		rshift = gshift + gsize;
+
+		rmask = ((1 << rsize) - 1) << rshift;
+		gmask = ((1 << gsize) - 1) << gshift;
+		bmask = ((1 << bsize) - 1) << bshift;
+		amask = ((1 << asize) - 1) << ashift;
+	}
 
 	const uint byteCount = bitCount / 8;
 
-	const uint rmask = compressionOptions.rmask;
-	uint rshift, rsize;
-	PixelFormat::maskShiftAndSize(rmask, &rshift, &rsize);
-	
-	const uint gmask = compressionOptions.gmask;
-	uint gshift, gsize;
-	PixelFormat::maskShiftAndSize(gmask, &gshift, &gsize);
-	
-	const uint bmask = compressionOptions.bmask;
-	uint bshift, bsize;
-	PixelFormat::maskShiftAndSize(bmask, &bshift, &bsize);
-	
-	const uint amask = compressionOptions.amask;
-	uint ashift, asize;
-	PixelFormat::maskShiftAndSize(amask, &ashift, &asize);
 
 	// Determine pitch.
-	uint pitch = computePitch(w, compressionOptions.bitcount);
+	uint pitch = computePitch(w, bitCount);
 
 	uint8 * dst = (uint8 *)mem::malloc(pitch + 4);
 
@@ -138,3 +163,66 @@ void nv::compressRGB(const Image * image, const OutputOptions::Private & outputO
 	mem::free(dst);
 }
 
+
+void nv::compressRGB(const FloatImage * image, const OutputOptions::Private & outputOptions, const CompressionOptions::Private & compressionOptions)
+{
+	nvCheck(image != NULL);
+
+	const uint w = image->width();
+	const uint h = image->height();
+
+	const uint rsize = compressionOptions.rsize;
+	const uint gsize = compressionOptions.gsize;
+	const uint bsize = compressionOptions.bsize;
+	const uint asize = compressionOptions.asize;
+
+	nvCheck(rsize == 0 || rsize == 16 || rsize == 32);
+	nvCheck(gsize == 0 || gsize == 16 || gsize == 32);
+	nvCheck(bsize == 0 || bsize == 16 || bsize == 32);
+	nvCheck(asize == 0 || asize == 16 || asize == 32);
+
+	const uint bitCount = rsize + gsize + bsize + asize;
+	const uint byteCount = bitCount / 8;
+	const uint pitch = w * byteCount;
+
+	uint8 * dst = (uint8 *)mem::malloc(pitch);
+
+	for (uint y = 0; y < h; y++)
+	{
+		const float * rchannel = image->scanline(y, 0);
+		const float * gchannel = image->scanline(y, 1);
+		const float * bchannel = image->scanline(y, 2);
+		const float * achannel = image->scanline(y, 3);
+
+		for (uint x = 0; x < w; x++)
+		{
+			float r = rchannel[x];
+			float g = gchannel[x];
+			float b = bchannel[x];
+			float a = achannel[x];
+
+			if (rsize == 32) *((float *)dst) = r;
+			//else if (rsize == 16) *((half *)dst) = half(r);
+			dst += rsize / 8;
+
+			if (gsize == 32) *((float *)dst) = g;
+			//else if (gsize == 16) *((half *)dst) = half(g);
+			dst += gsize / 8;
+
+			if (bsize == 32) *((float *)dst) = b;
+			//else if (bsize == 16) *((half *)dst) = half(b);
+			dst += bsize / 8;
+
+			if (asize == 32) *((float *)dst) = a;
+			//else if (asize == 16) *((half *)dst) = half(a);
+			dst += asize / 8;
+		}
+
+		if (outputOptions.outputHandler != NULL)
+		{
+			outputOptions.outputHandler->writeData(dst, pitch);
+		}
+	}
+
+	mem::free(dst);
+}
diff --git a/src/nvtt/CompressRGB.h b/src/nvtt/CompressRGB.h
index 3bab47d..7d8ae6b 100644
--- a/src/nvtt/CompressRGB.h
+++ b/src/nvtt/CompressRGB.h
@@ -29,9 +29,11 @@
 namespace nv
 {
 	class Image;
+	class FloatImage;
 
 	// Pixel format converter.
 	void compressRGB(const Image * image, const nvtt::OutputOptions::Private & outputOptions, const nvtt::CompressionOptions::Private & compressionOptions);
+	void compressRGB(const FloatImage * image, const nvtt::OutputOptions::Private & outputOptions, const nvtt::CompressionOptions::Private & compressionOptions);
 	
 } // nv namespace
 
diff --git a/src/nvtt/CompressionOptions.cpp b/src/nvtt/CompressionOptions.cpp
index 944256e..c338de0 100644
--- a/src/nvtt/CompressionOptions.cpp
+++ b/src/nvtt/CompressionOptions.cpp
@@ -117,8 +117,36 @@ void CompressionOptions::setPixelFormat(uint bitcount, uint rmask, uint gmask, u
 	m.gmask = gmask;
 	m.bmask = bmask;
 	m.amask = amask;
+
+	m.rsize = 0;
+	m.gsize = 0;
+	m.bsize = 0;
+	m.asize = 0;
 }
 
+void CompressionOptions::setPixelFormat(uint8 rsize, uint8 gsize, uint8 bsize, uint8 asize)
+{
+	nvCheck(rsize <= 32 || gsize <= 32 || bsize <= 32 || asize <= 32);
+
+	m.bitcount = 0;
+	m.rmask = 0;
+	m.gmask = 0;
+	m.bmask = 0;
+	m.amask = 0;
+
+	m.rsize = rsize;
+	m.gsize = gsize;
+	m.bsize = bsize;
+	m.asize = asize;
+}
+
+/// Set pixel type.
+void CompressionOptions::setPixelType(PixelType pixelType)
+{
+	m.pixelType = pixelType;
+}
+
+
 /// Use external compressor.
 void CompressionOptions::setExternalCompressor(const char * name)
 {
diff --git a/src/nvtt/CompressionOptions.h b/src/nvtt/CompressionOptions.h
index 3508ff3..1e45bd0 100644
--- a/src/nvtt/CompressionOptions.h
+++ b/src/nvtt/CompressionOptions.h
@@ -45,6 +45,10 @@ namespace nvtt
 		uint gmask;
 		uint bmask;
 		uint amask;
+		uint8 rsize;
+		uint8 gsize;
+		uint8 bsize;
+		uint8 asize;
 		
 		PixelType pixelType;
 		
diff --git a/src/nvtt/Compressor.cpp b/src/nvtt/Compressor.cpp
index 2b337bb..651cb28 100644
--- a/src/nvtt/Compressor.cpp
+++ b/src/nvtt/Compressor.cpp
@@ -393,7 +393,49 @@ bool Compressor::Private::outputHeader(const InputOptions::Private & inputOption
 			if (compressionOptions.format == Format_RGBA)
 			{
 				header.setPitch(computePitch(inputOptions.targetWidth, compressionOptions.bitcount));
-				header.setPixelFormat(compressionOptions.bitcount, compressionOptions.rmask, compressionOptions.gmask, compressionOptions.bmask, compressionOptions.amask);
+
+				if (compressionOptions.bitcount != 0)
+				{
+					header.setPixelFormat(compressionOptions.bitcount, compressionOptions.rmask, compressionOptions.gmask, compressionOptions.bmask, compressionOptions.amask);
+				}
+				else
+				{
+					if (compressionOptions.pixelType == PixelType_Float)
+					{
+						if (compressionOptions.rsize == 16 && compressionOptions.gsize == 0 && compressionOptions.bsize == 0 && compressionOptions.asize == 0)
+						{
+							header.setFormatCode(111); // D3DFMT_R16F
+						}
+						else if (compressionOptions.rsize == 16 && compressionOptions.gsize == 16 && compressionOptions.bsize == 0 && compressionOptions.asize == 0)
+						{
+							header.setFormatCode(112); // D3DFMT_G16R16F
+						}
+						else if (compressionOptions.rsize == 16 && compressionOptions.gsize == 16 && compressionOptions.bsize == 16 && compressionOptions.asize == 16)
+						{
+							header.setFormatCode(113); // D3DFMT_A16B16G16R16F
+						}
+						else if (compressionOptions.rsize == 32 && compressionOptions.gsize == 0 && compressionOptions.bsize == 0 && compressionOptions.asize == 0)
+						{
+							header.setFormatCode(114); // D3DFMT_R32F
+						}
+						else if (compressionOptions.rsize == 32 && compressionOptions.gsize == 32 && compressionOptions.bsize == 0 && compressionOptions.asize == 0)
+						{
+							header.setFormatCode(115); // D3DFMT_G32R32F
+						}
+						else if (compressionOptions.rsize == 32 && compressionOptions.gsize == 32 && compressionOptions.bsize == 32 && compressionOptions.asize == 32)
+						{
+							header.setFormatCode(116); // D3DFMT_A32B32G32R32F
+						}
+						else
+						{
+							supported = false;
+						}
+					}
+					else
+					{
+						supported = false;
+					}
+				}
 			}
 			else
 			{
@@ -503,6 +545,8 @@ bool Compressor::Private::compressMipmaps(uint f, const InputOptions::Private &
 			}
 		}
 		
+		// @@ Do alpha premultiplication and YCoCg transformation here. Allow these operations to be done in floating point.
+
 		quantizeMipmap(mipmap, compressionOptions);
 
 		compressMipmap(mipmap, inputOptions, compressionOptions, outputOptions);
@@ -805,6 +849,8 @@ bool Compressor::Private::compressMipmap(const Mipmap & mipmap, const InputOptio
 	const Image * image = mipmap.asFixedImage();
 	nvDebugCheck(image != NULL);
 
+	// @@ Use FastCompressor::isSupported(compressionOptions.format) to chose compressor.
+
 	FastCompressor fast;
 	fast.setImage(image, inputOptions.alphaMode);
 
@@ -812,7 +858,7 @@ bool Compressor::Private::compressMipmap(const Mipmap & mipmap, const InputOptio
 	slow.setImage(image, inputOptions.alphaMode);
 
 
-	if (compressionOptions.format == Format_RGBA || compressionOptions.format == Format_RGB)
+	if (compressionOptions.format == Format_RGBA)
 	{
 		compressRGB(image, outputOptions, compressionOptions);
 	}
diff --git a/src/nvtt/InputOptions.cpp b/src/nvtt/InputOptions.cpp
index 474c16c..b08d735 100644
--- a/src/nvtt/InputOptions.cpp
+++ b/src/nvtt/InputOptions.cpp
@@ -252,6 +252,68 @@ bool InputOptions::setMipmapData(const void * data, int width, int height, int d
 }
 
 
+// Copies data 
+bool InputOptions::setMipmapChannelData(const void * data, int channel, int width, int height, int depth /*= 1*/, int face /*= 0*/, int mipLevel /*= 0*/)
+{
+	nvCheck(depth == 1);
+	nvCheck(channel >= 0 && channel < 4);
+	
+	const int idx = face * m.mipmapCount + mipLevel;
+	
+	if (m.images[idx].width != width || m.images[idx].height != height || m.images[idx].depth != depth || m.images[idx].mipLevel != mipLevel || m.images[idx].face != face)
+	{
+		// Invalid dimension or index.
+		return false;
+	}
+	
+	// Allocate image if not allocated already.
+	if (m.inputFormat == InputFormat_BGRA_8UB)
+	{
+		m.images[idx].floatdata = NULL;
+		if (m.images[idx].uint8data == NULL)
+		{
+			m.images[idx].uint8data = new Image();
+		}
+
+		m.images[idx].uint8data->allocate(width, height);
+	}
+	else if (m.inputFormat == InputFormat_RGBA_32F)
+	{
+		m.images[idx].uint8data = NULL;
+		if (m.images[idx].floatdata == NULL)
+		{
+			m.images[idx].floatdata = new FloatImage();
+		}
+
+		m.images[idx].floatdata->allocate(4, width, height);
+	}
+	else
+	{
+		m.images[idx].floatdata = NULL;
+		m.images[idx].uint8data = NULL;
+		return false;
+	}
+
+	// Copy channel data to image.
+	if (m.inputFormat == InputFormat_BGRA_8UB)
+	{
+		// @@ TODO
+	}
+	else if (m.inputFormat == InputFormat_RGBA_32F)
+	{
+		const float * floatData = (const float *)data;
+		float * channelPtr = m.images[idx].floatdata->channel(channel);
+
+		for (int i = 0; i < width * height; i++)
+		{
+			channelPtr[i] = floatData[i];
+		}
+	}
+
+	return true;
+}
+
+
 /// Describe the format of the input.
 void InputOptions::setFormat(InputFormat format)
 {
diff --git a/src/nvtt/nvtt.h b/src/nvtt/nvtt.h
index 1bf67b8..05194b7 100644
--- a/src/nvtt/nvtt.h
+++ b/src/nvtt/nvtt.h
@@ -125,9 +125,7 @@ namespace nvtt
 
 		// Set color mask to describe the RGB/RGBA format.
 		NVTT_API void setPixelFormat(unsigned int bitcount, unsigned int rmask, unsigned int gmask, unsigned int bmask, unsigned int amask);
-		
-		// As
-		NVTT_API void setPixelFormat2(unsigned int rsize, unsigned int gsize, unsigned int bsize, unsigned int asize);
+		NVTT_API void setPixelFormat(unsigned char rsize, unsigned char gsize, unsigned char bsize, unsigned char asize);
 		
 		NVTT_API void setPixelType(PixelType pixelType);
 
@@ -220,6 +218,7 @@ namespace nvtt
 		
 		// Set mipmap data. Copies the data.
 		NVTT_API bool setMipmapData(const void * data, int w, int h, int d = 1, int face = 0, int mipmap = 0);
+		NVTT_API bool setMipmapChannelData(const void * data, int channel, int w, int h, int d = 1, int face = 0, int mipmap = 0);
 		
 		// Describe the format of the input.
 		NVTT_API void setFormat(InputFormat format);
diff --git a/src/nvtt/tools/compress.cpp b/src/nvtt/tools/compress.cpp
index bdea54f..af1bd45 100644
--- a/src/nvtt/tools/compress.cpp
+++ b/src/nvtt/tools/compress.cpp
@@ -392,7 +392,10 @@ int main(int argc, char *argv[])
 			inputOptions.setFormat(nvtt::InputFormat_RGBA_32F);
 			inputOptions.setTextureLayout(nvtt::TextureType_2D, image->width(), image->height());
 
-			inputOptions.setMipmapData(image->channel(0), image->width(), image->height());
+			for (uint i = 0; i < image->componentNum(); i++)
+			{
+				inputOptions.setMipmapChannelData(image->channel(i), i, image->width(), image->height());
+			}
 		}
 		else
 		{
@@ -446,6 +449,13 @@ int main(int argc, char *argv[])
 
 	nvtt::CompressionOptions compressionOptions;
 	compressionOptions.setFormat(format);
+
+	if (format == nvtt::Format_RGBA)
+	{
+		compressionOptions.setPixelType(nvtt::PixelType_Float);
+		compressionOptions.setPixelFormat(32, 32, 32, 32);
+	}
+
 	if (fast)
 	{
 		compressionOptions.setQuality(nvtt::Quality_Fastest);