From e668795fe7bcab0aa379f6302bf51c230d497cdb Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Branimir=20Karad=C5=BEi=C4=87?= <branimirkaradzic@gmail.com>
Date: Fri, 6 Jul 2018 18:45:33 -0700
Subject: [PATCH 1/2] texturec: Separated equirect and horizontal strip.

---
 tools/texturec/texturec.cpp | 37 +++++++++++++++++++++++++++++++------
 1 file changed, 31 insertions(+), 6 deletions(-)

diff --git a/tools/texturec/texturec.cpp b/tools/texturec/texturec.cpp
index 9780381..6d5b4b6 100644
--- a/tools/texturec/texturec.cpp
+++ b/tools/texturec/texturec.cpp
@@ -44,6 +44,8 @@ struct Options
 			"\t      pma: %s\n"
 			"\t      sdf: %s\n"
 			"\t radiance: %s\n"
+			"\t equirect: %s\n"
+			"\t    strip: %s\n"
 			, maxSize
 			, edge
 			, bimg::getName(format)
@@ -53,6 +55,8 @@ struct Options
 			, pma       ? "true" : "false"
 			, sdf       ? "true" : "false"
 			, radiance  ? "true" : "false"
+			, equirect  ? "true" : "false"
+			, strip     ? "true" : "false"
 			);
 	}
 
@@ -64,6 +68,7 @@ struct Options
 	bool mips      = false;
 	bool normalMap = false;
 	bool equirect  = false;
+	bool strip     = false;
 	bool iqa       = false;
 	bool pma       = false;
 	bool sdf       = false;
@@ -169,8 +174,18 @@ bimg::ImageContainer* convert(bx::AllocatorI* _allocator, const void* _inputData
 					outputHeight = _options.maxSize*2;
 				}
 			}
-			else if (outputDepth   == 1
-				 &&  outputWidth/6 == outputHeight)
+			else
+			{
+				bimg::imageFree(input);
+
+				BX_ERROR_SET(_err, TEXTRUREC_ERROR, "Input image format is not equirectangular projection.");
+				return NULL;
+			}
+		}
+		else if (_options.strip)
+		{
+			if (outputDepth   == 1
+			&&  outputWidth/6 == outputHeight)
 			{
 				if (outputWidth/6 > _options.maxSize)
 				{
@@ -182,7 +197,7 @@ bimg::ImageContainer* convert(bx::AllocatorI* _allocator, const void* _inputData
 			{
 				bimg::imageFree(input);
 
-				BX_ERROR_SET(_err, TEXTRUREC_ERROR, "Input image format is not equirectangular projection.");
+				BX_ERROR_SET(_err, TEXTRUREC_ERROR, "Input image format is not horizontal strip.");
 				return NULL;
 			}
 		}
@@ -222,7 +237,7 @@ bimg::ImageContainer* convert(bx::AllocatorI* _allocator, const void* _inputData
 			&& !_options.sdf
 			&& !_options.alphaTest
 			&& !_options.normalMap
-			&& !_options.equirect
+			&& !(_options.equirect || _options.strip)
 			&& !_options.iqa
 			&& !_options.pma
 			&& (bimg::LightingModel::Count == _options.radiance)
@@ -280,7 +295,8 @@ bimg::ImageContainer* convert(bx::AllocatorI* _allocator, const void* _inputData
 			return output;
 		}
 
-		if (_options.equirect)
+		if (_options.equirect
+		||  _options.strip)
 		{
 			bimg::ImageContainer* src = bimg::imageConvert(_allocator, bimg::TextureFormat::RGBA32F, *input);
 			bimg::imageFree(input);
@@ -816,7 +832,8 @@ void help(const char* _error = NULL, bool _showHelp = true)
 		  "  -q <quality>             Encoding quality (default, fastest, highest).\n"
 		  "  -m, --mips               Generate mip-maps.\n"
 		  "  -n, --normalmap          Input texture is normal map.\n"
-		  "      --equirect           Input texture equirectangular projection of cubemap.\n"
+		  "      --equirect           Input texture is equirectangular projection of cubemap.\n"
+		  "      --strip              Input texture is horizontal strip of cubemap.\n"
 		  "      --sdf <edge>         Compute SDF texture.\n"
 		  "      --ref <alpha>        Alpha reference value.\n"
 		  "      --iqa                Image Quality Assessment\n"
@@ -945,9 +962,17 @@ int main(int _argc, const char* _argv[])
 	options.mips      = cmdLine.hasArg('m', "mips");
 	options.normalMap = cmdLine.hasArg('n', "normalmap");
 	options.equirect  = cmdLine.hasArg("equirect");
+	options.strip     = cmdLine.hasArg("strip");
 	options.iqa       = cmdLine.hasArg("iqa");
 	options.pma       = cmdLine.hasArg("pma");
 
+	if (options.equirect
+	&&  options.strip)
+	{
+		help("Image can't be equirect and strip at the same time.");
+		return bx::kExitFailure;
+	}
+
 	const char* maxSize = cmdLine.findOption("max");
 	if (NULL != maxSize)
 	{

From 73e4e1deaaed4ecc849fffbb0f7a2a88e4030023 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Branimir=20Karad=C5=BEi=C4=87?= <branimirkaradzic@gmail.com>
Date: Fri, 6 Jul 2018 18:46:00 -0700
Subject: [PATCH 2/2] BC6H: Fixed issues with negative values in texture.

---
 3rdparty/nvtt/nvtt.cpp | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/3rdparty/nvtt/nvtt.cpp b/3rdparty/nvtt/nvtt.cpp
index aa1c2d2..0cc0df4 100644
--- a/3rdparty/nvtt/nvtt.cpp
+++ b/3rdparty/nvtt/nvtt.cpp
@@ -50,9 +50,9 @@ namespace nvtt
 					for (uint32_t blockX = 0; blockX < ZOH::Tile::TILE_W; ++blockX)
 					{
 						nv::Vector4 color = srcRgba[blockY*srcRgbaStride + blockX];
-						zohTile.data[blockY][blockX].x = float(int16_t(bx::halfFromFloat(color.x) ) );
-						zohTile.data[blockY][blockX].y = float(int16_t(bx::halfFromFloat(color.y) ) );
-						zohTile.data[blockY][blockX].z = float(int16_t(bx::halfFromFloat(color.z) ) );
+						zohTile.data[blockY][blockX].x = float(int16_t(bx::halfFromFloat(bx::max(color.x, 0.0f) ) ) );
+						zohTile.data[blockY][blockX].y = float(int16_t(bx::halfFromFloat(bx::max(color.y, 0.0f) ) ) );
+						zohTile.data[blockY][blockX].z = float(int16_t(bx::halfFromFloat(bx::max(color.z, 0.0f) ) ) );
 					}
 				}