- Adding support for skip blocks, i-frames and p-frames to the backen…

…d and transcoder, for texture video use.

- For PVRTC1, we now memset() any extra blocks after the blocks we know will be transcoded into. This is done because in GL there is padding that occurs on textures smaller than 8x8.
- Removing all OpenMP usage and replacing it with a basis C++11 job system.
- Fixing TSVQ class so it can split very long "thin" clusters that before weren't being split. This improves endpoint quantization on videos and complex 2D textures.
- More frontend perf. optimizations.

Tested on OSX, Linux with gcc/clang, and Win using MSVC 2019.

CMakeLists.txt

@@ -26,7 +26,7 @@ set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE}")
 set(CMAKE_C_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE}")
 
 set(CMAKE_CXX_FLAGS -std=c++11)
-set(GCC_COMPILE_FLAGS "-fvisibility=hidden -fvisibility-inlines-hidden -fPIC -fopenmp -fno-strict-aliasing -D_LARGEFILE64_SOURCE=1 -D_FILE_OFFSET_BITS=64 -Wall -Wextra -Wno-unused-local-typedefs -Wno-unused-value -Wno-unused-parameter -Wno-unused-but-set-variable -Wno-unused-variable -Wno-reorder")
+set(GCC_COMPILE_FLAGS "-fvisibility=hidden -fvisibility-inlines-hidden -fPIC -fno-strict-aliasing -D_LARGEFILE64_SOURCE=1 -D_FILE_OFFSET_BITS=64 -Wall -Wextra -Wno-unused-local-typedefs -Wno-unused-value -Wno-unused-parameter -Wno-unused-variable -Wno-reorder")
 
 if (NOT BUILD_X64)
 	set(GCC_COMPILE_FLAGS "${GCC_COMPILE_FLAGS} -m32")

basisu.vcxproj

@@ -98,7 +98,6 @@
       <WarningLevel>Level4</WarningLevel>
       <Optimization>Disabled</Optimization>
       <SDLCheck>true</SDLCheck>
-      <OpenMPSupport>true</OpenMPSupport>
       <AdditionalIncludeDirectories>
       </AdditionalIncludeDirectories>
       <MultiProcessorCompilation>true</MultiProcessorCompilation>
@@ -134,7 +133,6 @@
       <FunctionLevelLinking>true</FunctionLevelLinking>
       <IntrinsicFunctions>true</IntrinsicFunctions>
       <SDLCheck>true</SDLCheck>
-      <OpenMPSupport>true</OpenMPSupport>
       <AdditionalIncludeDirectories>
       </AdditionalIncludeDirectories>
       <PreprocessorDefinitions>NDEBUG;_MBCS;%(PreprocessorDefinitions)</PreprocessorDefinitions>