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GLUBUILD1DMIPMAPS(3G)			  OpenGL Manual 		    GLUBUILD1DMIPMAPS(3G)

NAME
       gluBuild1DMipmaps - builds a one-dimensional mipmap

C SPECIFICATION
       GLint gluBuild1DMipmaps(GLenum target, GLint internalFormat, GLsizei width, GLenum format,
			       GLenum type, 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.

       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.

       data
	   Specifies a pointer to the image data in memory.

DESCRIPTION
       gluBuild1DMipmaps builds a series 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()).

       Initially, the width of data is checked to see if it is a power of 2. If not, a copy of
       data is scaled up or down to the nearest power of 2. (If width is exactly between powers
       of 2, then the copy of data will scale upwards.) This copy will be used for subsequent
       mipmapping operations described below. For example, if width is 57, then a copy of data
       will scale up to 64 before mipmapping takes place.

       Then, proxy textures (see glTexImage1D()) are used to determine if the implementation can
       fit the requested texture. If not, width is continually halved until it fits.

       Next, a series of mipmap levels is built by decimating a copy of 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 each of these mipmap levels. Level 0 is a copy of data.
       The highest level is log 2  width. For example, if width is 64 and the implementation can
       store a texture of this size, the following mipmap levels are built: 64 x 1, 32 x 1, 16 x
       1, 8 x 1, 4 x 1, 2 x 1, and 1 x 1. These correspond to levels 0 through 6, respectively.

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

NOTES
       Note that there is no direct way of querying the maximum level. This can be derived
       indirectly via glGetTexLevelParameter(). First, query for the width actually used at level
       0. (The width may not be equal to width since proxy textures might have scaled it to fit
       the implementation.) Then the maximum level can be derived from the formula log 2  width.

       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, and if the GLU version is 1.3 or greater.

ERRORS
       GLU_INVALID_VALUE is returned if width is < 1.

       GLU_INVALID_ENUM is returned if 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
       gluBuild1DMipmapLevels(), 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			    GLUBUILD1DMIPMAPS(3G)
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