change render layer
bugfix: shader.draw should change program
Merge branch 'master' into render
fix some error
remove some opengl api for opengles 2.0
bugfix: should use program after create
remove unused code
commit render state before clear
update ios project
bugfix: typo
Merge branch 'render' of github.com:ejoy/ejoy2d into render
bugfix: typo
get default framebuffer at init
bugfix: reset vb after draw renderbuffer
user defined shader
add shader.texture
fix typo
remove mask attr used by blend
add material system
remove shader_st function