gluBuild1DMipmaps man page on RedHat
[printable version]
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 × 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 × 1, 32 × 1, 16 × 1, 8 × 1, 4
× 1, 2 × 1, and 1 × 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 © 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 03/16/2013 GLUBUILD1DMIPMAPS(3G)
[top]
List of man pages available for RedHat
Copyright (c) for man pages and the logo by the respective OS vendor.
For those who want to learn more, the polarhome community provides shell access and support.
[legal]
[privacy]
[GNU]
[policy]
[cookies]
[netiquette]
[sponsors]
[FAQ]
Polarhome, production since 1999.
Member of Polarhome portal.
Based on Fawad Halim's script.
....................................................................
|
|
Vote for polarhome
|
