1GLUBUILD1DMIPMAPLEVE(3G)         OpenGL Manual        GLUBUILD1DMIPMAPLEVE(3G)
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NAME

6       gluBuild1DMipmapLevels - builds a subset of one-dimensional mipmap
7       levels
8

C SPECIFICATION

10       GLint gluBuild1DMipmapLevels(GLenum target, GLint internalFormat,
11                                    GLsizei width, GLenum format, GLenum type,
12                                    GLint level, GLint base, GLint max,
13                                    const void * data);
14

PARAMETERS

16       target
17           Specifies the target texture. Must be GLU_TEXTURE_1D.
18
19       internalFormat
20           Requests the internal storage format of the texture image. The most
21           current version of the SGI implementation of GLU does not check
22           this value for validity before passing it on to the underlying
23           OpenGL implementation. A value that is not accepted by the OpenGL
24           implementation will lead to an OpenGL error. The benefit of not
25           checking this value at the GLU level is that OpenGL extensions can
26           add new internal texture formats without requiring a revision of
27           the GLU implementation. Older implementations of GLU check this
28           value and raise a GLU error if it is not 1, 2, 3, or 4 or one of
29           the following symbolic constants: GLU_ALPHA, GLU_ALPHA4,
30           GLU_ALPHA8, GLU_ALPHA12, GLU_ALPHA16, GLU_LUMINANCE,
31           GLU_LUMINANCE4, GLU_LUMINANCE8, GLU_LUMINANCE12, GLU_LUMINANCE16,
32           GLU_LUMINANCE_ALPHA, GLU_LUMINANCE4_ALPHA4, GLU_LUMINANCE6_ALPHA2,
33           GLU_LUMINANCE8_ALPHA8, GLU_LUMINANCE12_ALPHA4,
34           GLU_LUMINANCE12_ALPHA12, GLU_LUMINANCE16_ALPHA16, GLU_INTENSITY,
35           GLU_INTENSITY4, GLU_INTENSITY8, GLU_INTENSITY12, GLU_INTENSITY16,
36           GLU_RGB, GLU_R3_G3_B2, GLU_RGB4, GLU_RGB5, GLU_RGB8, GLU_RGB10,
37           GLU_RGB12, GLU_RGB16, GLU_RGBA, GLU_RGBA2, GLU_RGBA4, GLU_RGB5_A1,
38           GLU_RGBA8, GLU_RGB10_A2, GLU_RGBA12, or GLU_RGBA16.
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40       width
41           Specifies the width in pixels of the texture image. This should be
42           a power of 2.
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44       format
45           Specifies the format of the pixel data. Must be one of:
46           GLU_COLOR_INDEX, GLU_DEPTH_COMPONENT, GLU_RED, GLU_GREEN, GLU_BLUE,
47           GLU_ALPHA, GLU_RGB, GLU_RGBA, GLU_BGR, GLU_BGRA, GLU_LUMINANCE, or
48           GLU_LUMINANCE_ALPHA.
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50       type
51           Specifies the data type for data. Must be one of:
52           GLU_UNSIGNED_BYTE, GLU_BYTE, GLU_BITMAP, GLU_UNSIGNED_SHORT,
53           GLU_SHORT, GLU_UNSIGNED_INT, GLU_INT, GLU_FLOAT,
54           GLU_UNSIGNED_BYTE_3_3_2, GLU_UNSIGNED_BYTE_2_3_3_REV,
55           GLU_UNSIGNED_SHORT_5_6_5, GLU_UNSIGNED_SHORT_5_6_5_REV,
56           GLU_UNSIGNED_SHORT_4_4_4_4, GLU_UNSIGNED_SHORT_4_4_4_4_REV,
57           GLU_UNSIGNED_SHORT_5_5_5_1, GLU_UNSIGNED_SHORT_1_5_5_5_REV,
58           GLU_UNSIGNED_INT_8_8_8_8, GLU_UNSIGNED_INT_8_8_8_8_REV,
59           GLU_UNSIGNED_INT_10_10_10_2, or GLU_UNSIGNED_INT_2_10_10_10_REV.
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61       level
62           Specifies the mipmap level of the image data.
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64       base
65           Specifies the minimum mipmap level to pass to glTexImage1D().
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67       max
68           Specifies the maximum mipmap level to pass to glTexImage1D().
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70       data
71           Specifies a pointer to the image data in memory.
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DESCRIPTION

74       gluBuild1DMipmapLevels builds a subset of prefiltered one-dimensional
75       texture maps of decreasing resolutions called a mipmap. This is used
76       for the antialiasing of texture mapped primitives.
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78       A return value of zero indicates success, otherwise a GLU error code is
79       returned (see gluErrorString()).
80
81       A series of mipmap levels from base to max is built by decimating data
82       in half until size 1 × 1 is reached. At each level, each texel in the
83       halved mipmap level is an average of the corresponding two texels in
84       the larger mipmap level.  glTexImage1D() is called to load these mipmap
85       levels from base to max. If max is larger than the highest mipmap level
86       for the texture of the specified size, then a GLU error code is
87       returned (see gluErrorString()) and nothing is loaded.
88
89       For example, if level is 2 and width is 16, the following levels are
90       possible: 16 × 1, 8 × 1, 4 × 1, 2 × 1, 1 × 1. These correspond to
91       levels 2 through 6 respectively. If base is 3 and max is 5, then only
92       mipmap levels 8 × 1, 4 × 1 and 2 × 1 are loaded. However, if max is 7,
93       then an error is returned and nothing is loaded since max is larger
94       than the highest mipmap level which is, in this case, 6.
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96       The highest mipmap level can be derived from the formula log 2 ⁡ width
97       × 2 level.
98
99       See the glTexImage1D() reference page for a description of the
100       acceptable values for type parameter. See the glDrawPixels() reference
101       page for a description of the acceptable values for level parameter.
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NOTES

104       gluBuild1DMipmapLevels is only available if the GLU version is 1.3 or
105       greater.
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107       Formats GLU_BGR, and GLU_BGRA, and types GLU_UNSIGNED_BYTE_3_3_2,
108       GLU_UNSIGNED_BYTE_2_3_3_REV, GLU_UNSIGNED_SHORT_5_6_5,
109       GLU_UNSIGNED_SHORT_5_6_5_REV, GLU_UNSIGNED_SHORT_4_4_4_4,
110       GLU_UNSIGNED_SHORT_4_4_4_4_REV, GLU_UNSIGNED_SHORT_5_5_5_1,
111       GLU_UNSIGNED_SHORT_1_5_5_5_REV, GLU_UNSIGNED_INT_8_8_8_8,
112       GLU_UNSIGNED_INT_8_8_8_8_REV, GLU_UNSIGNED_INT_10_10_10_2, and
113       GLU_UNSIGNED_INT_2_10_10_10_REV are only available if the GL version is
114       1.2 or greater.
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ERRORS

117       GLU_INVALID_VALUE is returned if level > base, base < 0, max < base or
118       max is > the highest mipmap level for data.
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120       GLU_INVALID_VALUE is returned if width is < 1.
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122       GLU_INVALID_ENUM is returned if internalFormat, format, or type are not
123       legal.
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125       GLU_INVALID_OPERATION is returned if type is GLU_UNSIGNED_BYTE_3_3_2 or
126       GLU_UNSIGNED_BYTE_2_3_3_REV and format is not GLU_RGB.
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128       GLU_INVALID_OPERATION is returned if type is GLU_UNSIGNED_SHORT_5_6_5
129       or GLU_UNSIGNED_SHORT_5_6_5_REV and format is not GLU_RGB.
130
131       GLU_INVALID_OPERATION is returned if type is GLU_UNSIGNED_SHORT_4_4_4_4
132       or GLU_UNSIGNED_SHORT_4_4_4_4_REV and format is neither GLU_RGBA nor
133       GLU_BGRA.
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135       GLU_INVALID_OPERATION is returned if type is GLU_UNSIGNED_SHORT_5_5_5_1
136       or GLU_UNSIGNED_SHORT_1_5_5_5_REV and format is neither GLU_RGBA nor
137       GLU_BGRA.
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139       GLU_INVALID_OPERATION is returned if type is GLU_UNSIGNED_INT_8_8_8_8
140       or GLU_UNSIGNED_INT_8_8_8_8_REV and format is neither GLU_RGBA nor
141       GLU_BGRA.
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143       GLU_INVALID_OPERATION is returned if type is
144       GLU_UNSIGNED_INT_10_10_10_2 or GLU_UNSIGNED_INT_2_10_10_10_REV and
145       format is neither GLU_RGBA nor GLU_BGRA.
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SEE ALSO

148       gluBuild1DMipmaps(), gluBuild2DMipmapLevels(), gluBuild2DMipmaps(),
149       gluBuild3DMipmapLevels(), gluBuild3DMipmaps(), gluErrorString(),
150       glDrawPixels(), glGetTexImage(), glGetTexLevelParameter(),
151       glTexImage1D(), glTexImage2D(), glTexImage3D()
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154       Copyright © 1991-2006 Silicon Graphics, Inc. This document is licensed
155       under the SGI Free Software B License. For details, see
156       http://oss.sgi.com/projects/FreeB/.
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AUTHORS

159       opengl.org
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163opengl.org                        07/13/2018          GLUBUILD1DMIPMAPLEVE(3G)
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