cocos shader glPrograme 和 ProgrameState

GLPrograme 是可以复用的

N个Node可以使用同一个GLPrograme

但是如果Programe内拥有uniform变量时

每个特定的变量对应一个ProgrameState

/**
GLProgramState holds the 'state' (uniforms and attributes) of the GLProgram.A GLProgram 
can be used by thousands of Nodes, 
but if different uniform valuesare going to be used, 
then each node will need its own GLProgramState
*/

使用多重shader

https://blog.zengrong.net/post/2052.html