State Queries - Praise for OpenGL ES 30 Programming Guide - page 442

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GL_TEXTURE_SWIZZLE_G , GL_TEXTURE_SWIZZLE_B ,
GL_TEXTURE_SWIZZLE_A , GL_TEXTURE_WRAP_S ,
GL_TEXTURE_SWIZZLE_T , or GL_TEXTURE_WRAP_R
specifies an array of the appropriate type for storing the
returned parameter values

params

Sampler Queries

State information for sampler objects can be retrieved from the current
OpenGL ES 3.0 context by calling the following function:

void glGetSamplerParameterfv (GLuint sampler , GLenum pname ,

GLfloat * params )
void glGetSamplerParameteriv (GLuint sampler , GLenum pname ,
GLint * params )

specifies the name of a sampler object
specifies the sampler parameter to be retrieved; may be
GL_TEXTURE_MAG_FILTER , GL_TEXTURE_MIN_FILTER ,
GL_TEXTURE_MIN_LOD , GL_TEXTURE_MAX_LOD,
GL_TEXTURE_WRAP_S , GL_TEXTURE_WRAP_T ,
GL_TEXTURE_WRAP_R , GL_TEXTURE_COMPARE_MODE , or
GL_TEXTURE_COMPARE_FUNC
specifies an array of the appropriate type for storing the
returned parameter values

sampler
pname

params

Asynchronous Object Queries

Information about a query object can be retrieved from the current
OpenGL ES 3.0 context by calling the following function:

void glGetQueryiv (GLuint target , GLenum pname ,
GLint * params )

specifies the query target object; can be
GL_ANY_SAMPLES_PASSED,

target