Add ShaderTest sample and shader code
Merge branch 'improved_glprogram' of https://github.com/super626/cocos2d-x into improved_glprogram
Merge branch 'improved_glprogram' of https://github.com/super626/cocos2d-x into improved_glprogram
use STRINGGIFY(A) instead R""
Merge branch 'improved_glprogram' of github.com:super626/cocos2d-x into improved_glprogram
UniformValue use union array
compiles on windows
Merge branch 'improved_glprogram' of github.com:super626/cocos2d-x into improved_glprogram