OpenGLES: uniform变量传参

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uniform是shader里面的一种变量，它是由外部程序设置进来的，除非你显式地调用函数来修改这个uniform的值，否则它的值恒定不变。

quick是通过GLProgramState类提供的接口来传值的，下面列出相关方法：

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-- @overload self, int, vec2_table
-- @overload self, string, vec2_table
-- @function [parent=#GLProgramState] setUniformVec2
-- @param self
-- @param #string uniformName
-- @param #vec2_table value
-- @return GLProgramState#GLProgramState self (return value:cc.GLProgramState)

示例：glprogramState:setUniformVec2("blurSize",{x=0.3,y=0.3})
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-- @overload self, string, unsigned int
-- @overload self, string, cc.Texture2D
-- @overload self, int, cc.Texture2D
-- @overload self, int, unsigned int
-- @function [parent=#GLProgramState] setUniformTexture
-- @param self
-- @param #int uniformLocation
-- @param #unsigned int textureId
-- @return GLProgramState#GLProgramState self (return value:cc.GLProgramState)

示例：
local texture = cc.Director:getInstance():getTextureCache():addImage("mask.png")

glprogramState:setUniformTexture("u_mask_texture", texture:getName())

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-- @overload self, int, mat4_table
-- @overload self, string, mat4_table
-- @function [parent=#GLProgramState] setUniformMat4
-- @param self
-- @param #string uniformName
-- @param #mat4_table value
-- @return GLProgramState#GLProgramState self (return value:cc.GLProgramState)

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-- @overload self, int, float
-- @overload self, string, float
-- @function [parent=#GLProgramState] setUniformFloat
-- @param self
-- @param #string uniformName
-- @param #float value
-- @return GLProgramState#GLProgramState self (return value:cc.GLProgramState)

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-- @overload self, int, vec3_table
-- @overload self, string, vec3_table
-- @function [parent=#GLProgramState] setUniformVec3
-- @param self
-- @param #string uniformName
-- @param #vec3_table value
-- @return GLProgramState#GLProgramState self (return value:cc.GLProgramState)

示例：glprogramState:setUniformVec3("blurSize",{x=0.3,y=0.3,z=0.3})
--------------------------------
-- @overload self, int, int
-- @overload self, string, int
-- @function [parent=#GLProgramState] setUniformInt
-- @param self
-- @param #string uniformName
-- @param #int value
-- @return GLProgramState#GLProgramState self (return value:cc.GLProgramState)

--------------------------------
-- @overload self, int, vec4_table
-- @overload self, string, vec4_table
-- @function [parent=#GLProgramState] setUniformVec4
-- @param self
-- @param #string uniformName
-- @param #vec4_table value
-- @return GLProgramState#GLProgramState self (return value:cc.GLProgramState)

示例：glprogramState:setUniformVec4("blurSize",{x=0.3,y=0.3,z=0.3,w=0.3})

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