* PixelFormat use table
* Correct PixelFormat name to match 'GL_LUMINANCE'
* Up
* fix cube update texture enum
* linux build
* Refine ci
* fix linux build
* Remove unused function, match mtl framebuffer pixel format
* readPixels always RGBA format
* fix ci for linux
* fix linux build
* Remove unused functions
* fix travis
* fix android ci
* Update config.json
* linux glad
* Update CCGLViewImpl-desktop.cpp
* fix linux build
* Fix linux build
* Link issue [skip appveyor][skip travis]
* Update CMakeLists.txt
* Refine GL enums use
* Update test case name [skip appveyor][skip travis]
* fix linux link issue
* for mtl
* fix ci
* Tidy pixelformat enums
* fix ci
* fix rgba8 to abgr4 error
* fix ci
* fix ci for GLES
* Fix linux build, require glibc-2.27+
* Use properly dist for travis [skip appveyor]
* fix linux build [skip appveyor]
* Update install-deps-linux.sh
* Remove unused members for pixel block info, update external to v73
* Sync from compile linux warnings
* Remove unused check, and PixelFormat::A8 is ordinary format, not compressed format
* metal doesn't support rgb8 (#3)
* Update CCTexture2D.cpp
* Refine code
* Pixel Format Descriptor Table
* fix ci
* BGR5A1
* Simplfy texture format convert function name
* Update
* rgba4 match mtl render format
* Add note about RGBA4
* Remove unused function
* fix osx
* Already converted at texture2d
* Clearly comment
* fixup
halx99