Added support for BC4 (aka 3Dc+) compressed textures

src/modules/image/CompressedData.cpp

@@ -115,6 +115,8 @@ StringMap<CompressedData::TextureType, CompressedData::TYPE_MAX_ENUM>::Entry Com
 	{"dxt1", CompressedData::TYPE_DXT1},
 	{"dxt3", CompressedData::TYPE_DXT3},
 	{"dxt5", CompressedData::TYPE_DXT5},
+	{"bc4", CompressedData::TYPE_BC4},
+	{"bc4s", CompressedData::TYPE_BC4s},
 	{"bc5", CompressedData::TYPE_BC5},
 	{"bc5s", CompressedData::TYPE_BC5s},
 };

src/modules/image/CompressedData.h

@@ -50,6 +50,8 @@ public:
 		TYPE_DXT1,
 		TYPE_DXT3,
 		TYPE_DXT5,
+		TYPE_BC4,
+		TYPE_BC4s,
 		TYPE_BC5,
 		TYPE_BC5s,
 		TYPE_MAX_ENUM

src/modules/image/magpie/ddsHandler.cpp

@@ -101,6 +101,10 @@ CompressedData::TextureType ddsHandler::convertFormat(dds::Format ddsformat)
 		return CompressedData::TYPE_DXT3;
 	case dds::FORMAT_DXT5:
 		return CompressedData::TYPE_DXT5;
+	case dds::FORMAT_BC4:
+		return CompressedData::TYPE_BC4;
+	case dds::FORMAT_BC4s:
+		return CompressedData::TYPE_BC4s;
 	case dds::FORMAT_BC5:
 		return CompressedData::TYPE_BC5;
 	case dds::FORMAT_BC5s: