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GLUBUILD1DMIPMAPLEVE(3G)		  OpenGL Manual 		 GLUBUILD1DMIPMAPLEVE(3G)

NAME
       gluBuild1DMipmapLevels - builds a subset of one-dimensional mipmap levels

C SPECIFICATION
       GLint gluBuild1DMipmapLevels(GLenum target, GLint internalFormat, GLsizei width,
				    GLenum format, GLenum type, GLint level, GLint base,
				    GLint max, const void * data);

PARAMETERS
       target
	   Specifies the target texture. Must be GLU_TEXTURE_1D.

       internalFormat
	   Requests the internal storage format of the texture image. The most current version of
	   the SGI implementation of GLU does not check this value for validity before passing it
	   on to the underlying OpenGL implementation. A value that is not accepted by the OpenGL
	   implementation will lead to an OpenGL error. The benefit of not checking this value at
	   the GLU level is that OpenGL extensions can add new internal texture formats without
	   requiring a revision of the GLU implementation. Older implementations of GLU check
	   this value and raise a GLU error if it is not 1, 2, 3, or 4 or one of the following
	   symbolic constants: GLU_ALPHA, GLU_ALPHA4, GLU_ALPHA8, GLU_ALPHA12, GLU_ALPHA16,
	   GLU_LUMINANCE, GLU_LUMINANCE4, GLU_LUMINANCE8, GLU_LUMINANCE12, GLU_LUMINANCE16,
	   GLU_LUMINANCE_ALPHA, GLU_LUMINANCE4_ALPHA4, GLU_LUMINANCE6_ALPHA2,
	   GLU_LUMINANCE8_ALPHA8, GLU_LUMINANCE12_ALPHA4, GLU_LUMINANCE12_ALPHA12,
	   GLU_LUMINANCE16_ALPHA16, GLU_INTENSITY, GLU_INTENSITY4, GLU_INTENSITY8,
	   GLU_INTENSITY12, GLU_INTENSITY16, GLU_RGB, GLU_R3_G3_B2, GLU_RGB4, GLU_RGB5, GLU_RGB8,
	   GLU_RGB10, GLU_RGB12, GLU_RGB16, GLU_RGBA, GLU_RGBA2, GLU_RGBA4, GLU_RGB5_A1,
	   GLU_RGBA8, GLU_RGB10_A2, GLU_RGBA12, or GLU_RGBA16.

       width
	   Specifies the width in pixels of the texture image. This should be a power of 2.

       format
	   Specifies the format of the pixel data. Must be one of: GLU_COLOR_INDEX,
	   GLU_DEPTH_COMPONENT, GLU_RED, GLU_GREEN, GLU_BLUE, GLU_ALPHA, GLU_RGB, GLU_RGBA,
	   GLU_BGR, GLU_BGRA, GLU_LUMINANCE, or GLU_LUMINANCE_ALPHA.

       type
	   Specifies the data type for data. Must be one of: GLU_UNSIGNED_BYTE, GLU_BYTE,
	   GLU_BITMAP, GLU_UNSIGNED_SHORT, GLU_SHORT, GLU_UNSIGNED_INT, GLU_INT, GLU_FLOAT,
	   GLU_UNSIGNED_BYTE_3_3_2, GLU_UNSIGNED_BYTE_2_3_3_REV, GLU_UNSIGNED_SHORT_5_6_5,
	   GLU_UNSIGNED_SHORT_5_6_5_REV, GLU_UNSIGNED_SHORT_4_4_4_4,
	   GLU_UNSIGNED_SHORT_4_4_4_4_REV, GLU_UNSIGNED_SHORT_5_5_5_1,
	   GLU_UNSIGNED_SHORT_1_5_5_5_REV, GLU_UNSIGNED_INT_8_8_8_8,
	   GLU_UNSIGNED_INT_8_8_8_8_REV, GLU_UNSIGNED_INT_10_10_10_2, or
	   GLU_UNSIGNED_INT_2_10_10_10_REV.

       level
	   Specifies the mipmap level of the image data.

       base
	   Specifies the minimum mipmap level to pass to glTexImage1D().

       max
	   Specifies the maximum mipmap level to pass to glTexImage1D().

       data
	   Specifies a pointer to the image data in memory.

DESCRIPTION
       gluBuild1DMipmapLevels builds a subset of prefiltered one-dimensional texture maps of
       decreasing resolutions called a mipmap. This is used for the antialiasing of texture
       mapped primitives.

       A return value of zero indicates success, otherwise a GLU error code is returned (see
       gluErrorString()).

       A series of mipmap levels from base to max is built by decimating data in half until size
       1 x 1 is reached. At each level, each texel in the halved mipmap level is an average of
       the corresponding two texels in the larger mipmap level.  glTexImage1D() is called to load
       these mipmap levels from base to max. If max is larger than the highest mipmap level for
       the texture of the specified size, then a GLU error code is returned (see
       gluErrorString()) and nothing is loaded.

       For example, if level is 2 and width is 16, the following levels are possible: 16 x 1, 8 x
       1, 4 x 1, 2 x 1, 1 x 1. These correspond to levels 2 through 6 respectively. If base is 3
       and max is 5, then only mipmap levels 8 x 1, 4 x 1 and 2 x 1 are loaded. However, if max
       is 7, then an error is returned and nothing is loaded since max is larger than the highest
       mipmap level which is, in this case, 6.

       The highest mipmap level can be derived from the formula log 2  width x 2 level.

       See the glTexImage1D() reference page for a description of the acceptable values for type
       parameter. See the glDrawPixels() reference page for a description of the acceptable
       values for level parameter.

NOTES
       gluBuild1DMipmapLevels is only available if the GLU version is 1.3 or greater.

       Formats GLU_BGR, and GLU_BGRA, and types GLU_UNSIGNED_BYTE_3_3_2,
       GLU_UNSIGNED_BYTE_2_3_3_REV, GLU_UNSIGNED_SHORT_5_6_5, GLU_UNSIGNED_SHORT_5_6_5_REV,
       GLU_UNSIGNED_SHORT_4_4_4_4, GLU_UNSIGNED_SHORT_4_4_4_4_REV, GLU_UNSIGNED_SHORT_5_5_5_1,
       GLU_UNSIGNED_SHORT_1_5_5_5_REV, GLU_UNSIGNED_INT_8_8_8_8, GLU_UNSIGNED_INT_8_8_8_8_REV,
       GLU_UNSIGNED_INT_10_10_10_2, and GLU_UNSIGNED_INT_2_10_10_10_REV are only available if the
       GL version is 1.2 or greater.

ERRORS
       GLU_INVALID_VALUE is returned if level > base, base < 0, max < base or max is > the
       highest mipmap level for data.

       GLU_INVALID_VALUE is returned if width is < 1.

       GLU_INVALID_ENUM is returned if internalFormat, format, or type are not legal.

       GLU_INVALID_OPERATION is returned if type is GLU_UNSIGNED_BYTE_3_3_2 or
       GLU_UNSIGNED_BYTE_2_3_3_REV and format is not GLU_RGB.

       GLU_INVALID_OPERATION is returned if type is GLU_UNSIGNED_SHORT_5_6_5 or
       GLU_UNSIGNED_SHORT_5_6_5_REV and format is not GLU_RGB.

       GLU_INVALID_OPERATION is returned if type is GLU_UNSIGNED_SHORT_4_4_4_4 or
       GLU_UNSIGNED_SHORT_4_4_4_4_REV and format is neither GLU_RGBA nor GLU_BGRA.

       GLU_INVALID_OPERATION is returned if type is GLU_UNSIGNED_SHORT_5_5_5_1 or
       GLU_UNSIGNED_SHORT_1_5_5_5_REV and format is neither GLU_RGBA nor GLU_BGRA.

       GLU_INVALID_OPERATION is returned if type is GLU_UNSIGNED_INT_8_8_8_8 or
       GLU_UNSIGNED_INT_8_8_8_8_REV and format is neither GLU_RGBA nor GLU_BGRA.

       GLU_INVALID_OPERATION is returned if type is GLU_UNSIGNED_INT_10_10_10_2 or
       GLU_UNSIGNED_INT_2_10_10_10_REV and format is neither GLU_RGBA nor GLU_BGRA.

SEE ALSO
       gluBuild1DMipmaps(), gluBuild2DMipmapLevels(), gluBuild2DMipmaps(),
       gluBuild3DMipmapLevels(), gluBuild3DMipmaps(), gluErrorString(), glDrawPixels(),
       glGetTexImage(), glGetTexLevelParameter(), glTexImage1D(), glTexImage2D(), glTexImage3D()

COPYRIGHT
       Copyright (C) 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/.

AUTHORS
       opengl.org

opengl.org				    06/10/2014			 GLUBUILD1DMIPMAPLEVE(3G)
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