glGetActiveUniform, glGetAttachedShaders, glGetAttribLocation, glGetBufferParameter, glGetBufferPointerv, glGetBufferSubData, glGetCompressedTexImage, glGetError, glGetProgram, glGetProgramInfoLog, glGetQueryiv, glGetQueryObject, glGetShader, glGetShaderInfoLog, glGetShaderSource, glGetString, glGetTexImage, glGetTexLevelParameter, glGetTexParameter, glGetUniform, glGetUniformLocation, glGetVertexAttrib, glGetVertexAttribPointerv, glIsEnabled
Copyright 1991-2006 Silicon Graphics, Inc. This document is licensed under the SGI Free Software B License. For details, see http://oss.sgi.com/projects/FreeB/.
glGet: man3/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.
The following parameters return the associated value for the active texture unit: GL_TEXTURE_1D, GL_TEXTURE_BINDING_1D, GL_TEXTURE_2D, GL_TEXTURE_BINDING_2D, GL_TEXTURE_3D and GL_TEXTURE_BINDING_3D. GL_MAX_RECTANGLE_TEXTURE_SIZE, GL_MAX_TEXTURE_BUFFER_SIZE, GL_UNIFORM_BUFFER_BINDING, GL_TEXTURE_BINDING_BUFFER, GL_MAX_VERTEX_UNIFORM_BLOCKS, GL_MAX_FRAGMENT_UNIFORM_BLOCKS, GL_MAX_COMBINED_FRAGMENT_UNIFORM_COMPONENTS, GL_MAX_COMBINED_VERTEX_UNIFORM_COMPONENTS GL_MAX_COMBINED_UNIFORM_BLOCKS, GL_MAX_UNIFORM_BLOCK_SIZE, and GL_UNIFORM_BUFFER_OFFSET_ALIGNMENT are available only if the GL version is 3.1 or greater. GL_MAX_COMBINED_GEOMETRY_UNIFORM_COMPONENTS, GL_MAX_GEOMETRY_UNIFORM_BLOCKS, GL_MAX_GEOMETRY_INPUT_COMPONENTS, GL_MAX_GEOMETRY_OUTPUT_COMPONENTS, GL_MAX_GEOMETRY_OUTPUT_VERTICES, GL_MAX_GEOMETRY_TOTAL_OUTPUT_COMPONENTS and GL_MAX_GEOMETRY_TEXTURE_IMAGE_UNITS are available only if the GL version is 3.2 or greater. glGetInteger64v and glGetInteger64i_v are available only if the GL version is 3.2 or greater. GL_MAX_DUAL_SOURCE_DRAW_BUFFERS, GL_SAMPLER_BINDING, and GL_TIMESTAMP are available only if the GL version is 3.3 or greater.