GLint GLAPIENTRY 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 GL_TEXTURE_1D.
internalFormat Requests the internal storage format of the texture im‐
age. Must be 1, 2, 3, or 4 or one of the following sym‐
bolic constants: GL_ALPHA, GL_ALPHA4, GL_ALPHA8,
GL_ALPHA12, GL_ALPHA16, GL_LUMINANCE, GL_LUMINANCE4,
GL_LUMINANCE8, GL_LUMINANCE12, GL_LUMINANCE16,
GL_LUMINANCE_ALPHA, GL_LUMINANCE4_ALPHA4,
GL_LUMINANCE6_ALPHA2, GL_LUMINANCE8_ALPHA8,
GL_LUMINANCE12_ALPHA4, GL_LUMINANCE12_ALPHA12,
GL_LUMINANCE16_ALPHA16, GL_INTENSITY, GL_INTENSITY4,
GL_INTENSITY8, GL_INTENSITY12, GL_INTENSITY16, GL_RGB,
GL_R3_G3_B2, GL_RGB4, GL_RGB5, GL_RGB8, GL_RGB10,
GL_RGB12, GL_RGB16, GL_RGBA, GL_RGBA2, GL_RGBA4,
GL_RGB5_A1, GL_RGBA8, GL_RGB10_A2, GL_RGBA12 or
GL_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:
GL_COLOR_INDEX, GL_DEPTH_COMPONENT, GL_RED, GL_GREEN,
GL_BLUE, GL_ALPHA, GL_RGB, GL_RGBA, GL_BGR, GL_BGRA,
GL_LUMINANCE, or GL_LUMINANCE_ALPHA.
type Specifies the data type for data. Must be one of:
GL_UNSIGNED_BYTE, GL_BYTE, GL_BITMAP, GL_UNSIGNED_SHORT,
GL_SHORT, GL_UNSIGNED_INT, GL_INT, GL_FLOAT,
GL_UNSIGNED_BYTE_3_3_2, GL_UNSIGNED_BYTE_2_3_3_REV,
GL_UNSIGNED_SHORT_5_6_5, GL_UNSIGNED_SHORT_5_6_5_REV,
GL_UNSIGNED_SHORT_4_4_4_4,
GL_UNSIGNED_SHORT_4_4_4_4_REV,
GL_UNSIGNED_SHORT_5_5_5_1,
GL_UNSIGNED_SHORT_1_5_5_5_REV, GL_UNSIGNED_INT_8_8_8_8,
GL_UNSIGNED_INT_8_8_8_8_REV, GL_UNSIGNED_INT_10_10_10_2,
or GL_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 glTexIm‐
age1D.
A series of mipmap levels from base to max is built by decimating 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 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: 16×1, 8×1, 4×1, 2×1, 1×1. These correspond to levels 2 through
6 respectively. If base is 3 and max is 5, then only mipmap levels 8×1,
4×1 and 2×1 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
log2(width2level).
See the glTexImage1D reference page for a description of the acceptable
values for type parameter. See the glDrawPixels reference page for a de‐
scription of the acceptable values for level parameter.
NOTES
gluBuild1DMipmapLevels is only available if the GLU version is 1.3 or
greater.
Formats GL_BGR, and GL_BGRA, and types GL_UNSIGNED_BYTE_3_3_2,
GL_UNSIGNED_BYTE_2_3_3_REV, GL_UNSIGNED_SHORT_5_6_5,
GL_UNSIGNED_SHORT_5_6_5_REV, GL_UNSIGNED_SHORT_4_4_4_4,
GL_UNSIGNED_SHORT_4_4_4_4_REV, GL_UNSIGNED_SHORT_5_5_5_1,
GL_UNSIGNED_SHORT_1_5_5_5_REV, GL_UNSIGNED_INT_8_8_8_8,
GL_UNSIGNED_INT_8_8_8_8_REV, GL_UNSIGNED_INT_10_10_10_2, and
GL_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 GL_UNSIGNED_BYTE_3_3_2 or
GL_UNSIGNED_BYTE_2_3_3_REV and format is not GL_RGB.
GLU_INVALID_OPERATION is returned if type is GL_UNSIGNED_SHORT_5_6_5 or
GL_UNSIGNED_SHORT_5_6_5_REV and format is not GL_RGB.
GLU_INVALID_OPERATION is returned if type is GL_UNSIGNED_SHORT_4_4_4_4
or GL_UNSIGNED_SHORT_4_4_4_4_REV and format is neither GL_RGBA nor
glDrawPixels, glTexImage1D, glTexImage2D, glTexImage3D,
gluBuild1DMipmaps, gluBuild2DMipmaps, gluBuild3DMipmaps, gluErrorString,
glGetTexImage, glGetTexLevelParameter, gluBuild2DMipmapLevels,
gluBuild3DMipmapLevels
GLUBUILD1DMIPMAPLEVELS(3G)
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