Add support for input floating point images. Patch provided by Jim Tilander. See issue 27.

src/nvtt/Compressor.cpp

@@ -115,6 +115,11 @@ namespace nvtt
 			m_inputImage = inputOptions.image(idx);
 			m_fixedImage = NULL;
 			m_floatImage = NULL;
+			
+			if (const FloatImage * floatImage = inputOptions.floatImage(idx))
+			{
+				m_floatImage = floatImage->clone();
+			}
 		}
 
 		// Assign and take ownership of given image.
@@ -203,7 +208,7 @@ namespace nvtt
 		AutoPtr<FloatImage> m_floatImage;
 	};
 
-}
+} // nvtt namespace
 
 
 Compressor::Compressor() : m(*new Compressor::Private())
@@ -502,7 +507,7 @@ int Compressor::Private::findExactMipmap(const InputOptions::Private & inputOpti
 		
 		if (inputImage.width == int(w) && inputImage.height == int(h) && inputImage.depth == int(d))
 		{
-			if (inputImage.data != NULL)
+			if (inputImage.hasValidData())
 			{
 				return idx;
 			}
@@ -526,7 +531,7 @@ int Compressor::Private::findClosestMipmap(const InputOptions::Private & inputOp
 		int idx = f * inputOptions.mipmapCount + m;
 		const InputOptions::Private::InputImage & inputImage = inputOptions.images[idx];
 
-		if (inputImage.data != NULL)
+		if (inputImage.hasValidData())
 		{
 			int difference = (inputImage.width - w) + (inputImage.height - h) + (inputImage.depth - d);
 
@@ -647,7 +652,9 @@ void Compressor::Private::processInputImage(Mipmap & mipmap, const InputOptions:
 	}
 	else
 	{
-		if (inputOptions.inputGamma != inputOptions.outputGamma)
+		if (inputOptions.inputGamma != inputOptions.outputGamma ||
+			inputOptions.colorTransform == ColorTransform_Linear ||
+			inputOptions.colorTransform == ColorTransform_Swizzle)
 		{
 			mipmap.toFloatImage(inputOptions);
 		}

src/nvtt/InputOptions.cpp

@@ -165,7 +165,8 @@ void InputOptions::setTextureLayout(TextureType type, int width, int height, int
 			img.mipLevel = mipLevel;
 			img.face = f;
 			
-			img.data = NULL;
+			img.uint8data = NULL;
+			img.floatdata = NULL;
 			
 			w = max(1U, w / 2);
 			h = max(1U, h / 2);
@@ -203,9 +204,47 @@ bool InputOptions::setMipmapData(const void * data, int width, int height, int d
 		return false;
 	}
 	
-	m.images[idx].data = new nv::Image();
-	m.images[idx].data->allocate(width, height);
-	memcpy(m.images[idx].data->pixels(), data, width * height * 4); 
+	switch(m.inputFormat)
+	{
+		case InputFormat_BGRA_8UB:
+			if (Image * image = new nv::Image())
+			{
+				image->allocate(width, height);
+				memcpy(image->pixels(), data, width * height * 4);
+				m.images[idx].data = image;
+			}
+			else
+			{
+				// @@ Out of memory error.
+				return false;
+			}
+			break;
+		case InputFormat_RGBA_32F:
+			if (FloatImage * image = new nv::FloatImage())
+			{
+				const float * floatData = (const float *)data;
+				image->allocate(4, width, height);
+				
+				for (int c = 0; c < 4; c++)
+				{
+					float * channel = image->channel(c);
+					for (int i = 0; i < width * height; i++)
+					{
+						channel[i] = floatData[i*4 + c];
+					}
+				}
+				
+				m.images[idx].data = image;
+			}
+			else
+			{
+				// @@ Out of memory error.
+				return false;
+			}
+			break;
+		default:
+			return false;
+	}
 	
 	return true;
 }
@@ -416,7 +455,7 @@ const Image * InputOptions::Private::image(uint face, uint mipmap) const
 	nvDebugCheck(image.face == face);
 	nvDebugCheck(image.mipLevel == mipmap);
 
-	return image.data.ptr();
+	return image.uint8data.ptr();
 }
 
 const Image * InputOptions::Private::image(uint idx) const
@@ -425,5 +464,14 @@ const Image * InputOptions::Private::image(uint idx) const
 
 	const InputImage & image = this->images[idx];
 
-	return image.data.ptr();
+	return image.uint8data.ptr();
+}
+
+const FloatImage * InputOptions::Private::image(uint idx) const
+{
+	nvDebugCheck(idx < faceCount * mipmapCount);
+
+	const InputImage & image = this->images[idx];
+
+	return image.floatdata.ptr();
 }

src/nvtt/InputOptions.h

@@ -28,6 +28,7 @@
 #include <nvmath/Vector.h>
 #include <nvmath/Matrix.h>
 #include <nvimage/Image.h>
+#include <nvimage/FloatImage.h>
 #include "nvtt.h"
 
 namespace nvtt
@@ -94,6 +95,8 @@ namespace nvtt
 		const nv::Image * image(uint face, uint mipmap) const;
 		const nv::Image * image(uint idx) const;
 
+		const nv::FloatImage * floatImage(uint idx) const;
+
 	};
 
 	// Internal image structure.
@@ -108,7 +111,8 @@ namespace nvtt
 		int height;
 		int depth;
 		
-		nv::AutoPtr<nv::Image> data;
+		nv::AutoPtr<nv::Image> uint8data;
+		nv::AutoPtr<nv::FloatImage> floatdata;
 	};
 
 } // nvtt namespace

src/nvtt/nvtt.h

@@ -140,8 +140,7 @@ namespace nvtt
 	enum InputFormat
 	{
 		InputFormat_BGRA_8UB,
-	//	InputFormat_RGBE_8UB,
-	//	InputFormat_BGRA_32F,
+		InputFormat_RGBA_32F,
 	};
 	
 	/// Mipmap downsampling filters.