generate mipmaps for a specified texture target
Specifies the target to which the texture whose mimaps to generate is bound. target must be GL_TEXTURE_1D , GL_TEXTURE_2D , GL_TEXTURE_3D , GL_TEXTURE_1D_ARRAY , GL_TEXTURE_2D_ARRAY or GL_TEXTURE_CUBE_MAP .
glGenerateMipmap generates mipmaps for the texture attached to target of the active texture unit. For cube map textures, a GL_INVALID_OPERATION error is generated if the texture attached to target is not cube complete.
Mipmap generation replaces texel array levels through with arrays derived from the array, regardless of their previous contents. All other mimap arrays, including the array, are left unchanged by this computation.
The internal formats of the derived mipmap arrays all match those of the array. The contents of the derived arrays are computed by repeated, filtered reduction of the array. For one- and two-dimensional texture arrays, each layer is filtered independently.
GL_INVALID_ENUM is generated if target is not one of the accepted texture targets.
GL_INVALID_OPERATION is generated if target is GL_TEXTURE_CUBE_MAP and the texture bound to the GL_TEXTURE_CUBE_MAP target of the active texture unit is not cube complete.
Copyright 2010-2013 Khronos Group. This material may be distributed subject to the terms and conditions set forth in the Open Publication License, v 1.0, 8 June 1999. http://opencontent.org/openpub/ .