glGetFloatv

glGet: man2/glGet.xml

These four commands return values for simple state variables in GL. pname is a symbolic constant indicating the state variable to be returned, and params is a pointer to an array of the indicated type in which to place the returned data. Type conversion is performed if params has a different type than the state variable value being requested. If glGetBooleanv is called, a floating-point (or integer) value is converted to GL_FALSE if and only if it is 0.0 (or 0). Otherwise, it is converted to GL_TRUE. If glGetIntegerv is called, boolean values are returned as GL_TRUE or GL_FALSE, and most floating-point values are rounded to the nearest integer value. Floating-point colors and normals, however, are returned with a linear mapping that maps 1.0 to the most positive representable integer value and -1.0 to the most negative representable integer value. If glGetFloatv or glGetDoublev is called, boolean values are returned as GL_TRUE or GL_FALSE, and integer values are converted to floating-point values. The following symbolic constants are accepted by pname : Many of the boolean parameters can also be queried more easily using glIsEnabled.

GL_COLOR_LOGIC_OP, GL_COLOR_ARRAY, GL_COLOR_ARRAY_SIZE, GL_COLOR_ARRAY_STRIDE, GL_COLOR_ARRAY_TYPE, GL_EDGE_FLAG_ARRAY, GL_EDGE_FLAG_ARRAY_STRIDE, GL_INDEX_ARRAY, GL_INDEX_ARRAY_STRIDE, GL_INDEX_ARRAY_TYPE, GL_INDEX_LOGIC_OP, GL_NORMAL_ARRAY, GL_NORMAL_ARRAY_STRIDE, GL_NORMAL_ARRAY_TYPE, GL_POLYGON_OFFSET_UNITS, GL_POLYGON_OFFSET_FACTOR, GL_POLYGON_OFFSET_FILL, GL_POLYGON_OFFSET_LINE, GL_POLYGON_OFFSET_POINT, GL_TEXTURE_COORD_ARRAY, GL_TEXTURE_COORD_ARRAY_SIZE, GL_TEXTURE_COORD_ARRAY_STRIDE, GL_TEXTURE_COORD_ARRAY_TYPE, GL_VERTEX_ARRAY, GL_VERTEX_ARRAY_SIZE, GL_VERTEX_ARRAY_STRIDE, and GL_VERTEX_ARRAY_TYPE are available only if the GL version is 1.1 or greater. GL_ALIASED_POINT_SIZE_RANGE, GL_FEEDBACK_BUFFER_SIZE, GL_FEEDBACK_BUFFER_TYPE, GL_LIGHT_MODEL_AMBIENT, GL_LIGHT_MODEL_COLOR_CONTROL, GL_MAX_3D_TEXTURE_SIZE, GL_MAX_ELEMENTS_INDICES, GL_MAX_ELEMENTS_VERTICES, GL_PACK_IMAGE_HEIGHT, GL_PACK_SKIP_IMAGES, GL_RESCALE_NORMAL, GL_SELECTION_BUFFER_SIZE, GL_SMOOTH_LINE_WIDTH_GRANULARITY, GL_SMOOTH_LINE_WIDTH_RANGE, GL_SMOOTH_POINT_SIZE_GRANULARITY, GL_SMOOTH_POINT_SIZE_RANGE, GL_TEXTURE_3D, GL_TEXTURE_BINDING_3D, GL_UNPACK_IMAGE_HEIGHT, and GL_UNPACK_SKIP_IMAGES are available only if the GL version is 1.2 or greater. GL_COMPRESSED_TEXTURE_FORMATS, GL_NUM_COMPRESSED_TEXTURE_FORMATS, GL_TEXTURE_BINDING_CUBE_MAP, and GL_TEXTURE_COMPRESSION_HINT are available only if the GL version is 1.3 or greater. GL_BLEND_DST_ALPHA, GL_BLEND_DST_RGB, GL_BLEND_SRC_ALPHA, GL_BLEND_SRC_RGB, GL_CURRENT_FOG_COORD, GL_CURRENT_SECONDARY_COLOR, GL_FOG_COORD_ARRAY_STRIDE, GL_FOG_COORD_ARRAY_TYPE, GL_FOG_COORD_SRC, GL_MAX_TEXTURE_LOD_BIAS, GL_POINT_SIZE_MIN, GL_POINT_SIZE_MAX, GL_POINT_FADE_THRESHOLD_SIZE, GL_POINT_DISTANCE_ATTENUATION, GL_SECONDARY_COLOR_ARRAY_SIZE, GL_SECONDARY_COLOR_ARRAY_STRIDE, and GL_SECONDARY_COLOR_ARRAY_TYPE are available only if the GL version is 1.4 or greater. GL_ARRAY_BUFFER_BINDING, GL_COLOR_ARRAY_BUFFER_BINDING, GL_EDGE_FLAG_ARRAY_BUFFER_BINDING, GL_ELEMENT_ARRAY_BUFFER_BINDING, GL_FOG_COORD_ARRAY_BUFFER_BINDING, GL_INDEX_ARRAY_BUFFER_BINDING, GL_NORMAL_ARRAY_BUFFER_BINDING, GL_SECONDARY_COLOR_ARRAY_BUFFER_BINDING, GL_TEXTURE_COORD_ARRAY_BUFFER_BINDING, and GL_VERTEX_ARRAY_BUFFER_BINDING are available only if the GL version is 1.5 or greater. GL_BLEND_EQUATION_ALPHA, GL_BLEND_EQUATION_RGB, GL_DRAW_BUFFER, GL_FRAGMENT_SHADER_DERIVATIVE_HINT, GL_MAX_COMBINED_TEXTURE_IMAGE_UNITS, GL_MAX_DRAW_BUFFERS, GL_MAX_FRAGMENT_UNIFORM_COMPONENTS, GL_MAX_TEXTURE_COORDS, GL_MAX_TEXTURE_IMAGE_UNITS, GL_MAX_VARYING_FLOATS, GL_MAX_VERTEX_ATTRIBS, GL_MAX_VERTEX_TEXTURE_IMAGE_UNITS, GL_MAX_VERTEX_UNIFORM_COMPONENTS, GL_POINT_SPRITE, GL_STENCIL_BACK_FAIL, GL_STENCIL_BACK_FUNC, GL_STENCIL_BACK_PASS_DEPTH_FAIL, GL_STENCIL_BACK_PASS_DEPTH_PASS, GL_STENCIL_BACK_REF, GL_STENCIL_BACK_VALUE_MASK, GL_STENCIL_BACK_WRITEMASK, GL_VERTEX_PROGRAM_POINT_SIZE, and GL_VERTEX_PROGRAM_TWO_SIDE are available only if the GL version is 2.0 or greater. GL_CURRENT_RASTER_SECONDARY_COLOR, GL_PIXEL_PACK_BUFFER_BINDING and GL_PIXEL_UNPACK_BUFFER_BINDING are available only if the GL version is 2.1 or greater. GL_LINE_WIDTH_GRANULARITY was deprecated in GL version 1.2. Its functionality was replaced by GL_SMOOTH_LINE_WIDTH_GRANULARITY. GL_LINE_WIDTH_RANGE was deprecated in GL version 1.2. Its functionality was replaced by GL_SMOOTH_LINE_WIDTH_RANGE. GL_POINT_SIZE_GRANULARITY was deprecated in GL version 1.2. Its functionality was replaced by GL_SMOOTH_POINT_SIZE_GRANULARITY. GL_POINT_SIZE_RANGE was deprecated in GL version 1.2. Its functionality was replaced by GL_SMOOTH_POINT_SIZE_RANGE. GL_BLEND_EQUATION was deprecated in GL version 2.0. Its functionality was replaced by GL_BLEND_EQUATION_RGB and GL_BLEND_EQUATION_ALPHA. GL_COLOR_MATRIX, GL_COLOR_MATRIX_STACK_DEPTH, GL_COLOR_TABLE, GL_CONVOLUTION_1D, GL_CONVOLUTION_2D, GL_HISTOGRAM, GL_MAX_COLOR_MATRIX_STACK_DEPTH, GL_MINMAX, GL_POST_COLOR_MATRIX_COLOR_TABLE, GL_POST_COLOR_MATRIX_RED_BIAS, GL_POST_COLOR_MATRIX_GREEN_BIAS, GL_POST_COLOR_MATRIX_BLUE_BIAS, GL_POST_COLOR_MATRIX_ALPHA_BIAS, GL_POST_COLOR_MATRIX_RED_SCALE, GL_POST_COLOR_MATRIX_GREEN_SCALE, GL_POST_COLOR_MATRIX_BLUE_SCALE, GL_POST_COLOR_MATRIX_ALPHA_SCALE, GL_POST_CONVOLUTION_COLOR_TABLE, GL_POST_CONVOLUTION_RED_BIAS, GL_POST_CONVOLUTION_GREEN_BIAS, GL_POST_CONVOLUTION_BLUE_BIAS, GL_POST_CONVOLUTION_ALPHA_BIAS, GL_POST_CONVOLUTION_RED_SCALE, GL_POST_CONVOLUTION_GREEN_SCALE, GL_POST_CONVOLUTION_BLUE_SCALE, GL_POST_CONVOLUTION_ALPHA_SCALE, and GL_SEPARABLE_2D are available only if ARB_imaging is returned from glGet when called with the argument GL_EXTENSIONS. When the ARB_multitexture extension is supported, or the GL version is 1.3 or greater, the following parameters return the associated value for the active texture unit: GL_CURRENT_RASTER_TEXTURE_COORDS, GL_TEXTURE_1D, GL_TEXTURE_BINDING_1D, GL_TEXTURE_2D, GL_TEXTURE_BINDING_2D, GL_TEXTURE_3D, GL_TEXTURE_BINDING_3D, GL_TEXTURE_GEN_S, GL_TEXTURE_GEN_T, GL_TEXTURE_GEN_R, GL_TEXTURE_GEN_Q, GL_TEXTURE_MATRIX, and GL_TEXTURE_STACK_DEPTH. Likewise, the following parameters return the associated value for the active client texture unit: GL_TEXTURE_COORD_ARRAY, GL_TEXTURE_COORD_ARRAY_BUFFER_BINDING, GL_TEXTURE_COORD_ARRAY_SIZE, GL_TEXTURE_COORD_ARRAY_STRIDE, GL_TEXTURE_COORD_ARRAY_TYPE.