openGL之API学习（一零三）glGetActiveUniform

获取活跃一致变量的信息。变量可以在程序执行期间被访问，则该变量被认为是活动的

void glGetActiveUniform(     GLuint program,
      GLuint index,
      GLsizei bufSize,
      GLsizei *length,
      GLint *size,
      GLenum *type,
      GLchar *name);
 

program

    Specifies the program object to be queried.

指定着色器程序标识符
index

    Specifies the index of the uniform variable to be queried.

指定一致变量的索引序号
bufSize

    Specifies the maximum number of characters OpenGL is allowed to write in the character buffer indicated by name.

指定一致变量名的最大长度
length

    Returns the number of characters actually written by OpenGL in the string indicated by name (excluding the null terminator) if a value other than NULL is passed.

获取一致变量