gluBuild3DMipmapLevels(3G) OpenGL Reference gluBuild3DMipmapLevels(3G)
gluBuild3DMipmapLevels - builds a subset of three-dimensional mipmap
levels
GLint gluBuild3DMipmapLevels( GLenum target,
GLint internalFormat,
GLsizei width,
GLsizei height,
GLsizei depth,
GLenum format,
GLenum type,
GLint level,
GLint base,
GLint max,
const void *data )
target Specifies the target texture. Must be GL_TEXTURE_3D.
internalFormat Requests the internal storage format of the texture
image. Must be 1, 2, 3, 4, or one of the following
symbolic 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, height, depth
Specifies in pixels the width, height and depth
respectively, of the texture image. These 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,
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gluBuild3DMipmapLevels(3G) OpenGL Reference gluBuild3DMipmapLevels(3G)
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
glTexImage3D.
max Specifies the maximum mipmap level to pass to
glTexImage3D.
data Specifies a pointer to the image data in memory.
gluBuild3DMipmapLevels builds a subset of prefiltered three-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 along both dimensions until size 1 x 1 x 1 is reached. At each
level, each texel in the halved mipmap level is an average of the
corresponding eight texels in the larger mipmap level. (If exactly one of
the dimensions is 1, four texels are averaged. If exactly two of the
dimensions are 1, two texels are averaged.) glTexImage3D 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, height is 8 and depth is 4,
the following levels are possible: 16 x 8 x 4, 8 x 4 x 2, 4 x 2 x 1,
2 x 1 x 1, 1 x 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 4 x 2, 4 x 2 x 1 and 2 x 1 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 (max(width,height,depth)2level).
2
See the glTexImage1D reference page for a description of the acceptable
values for format parameter. See the glDrawPixels reference page for a
description of the acceptable values for type parameter.
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gluBuild3DMipmapLevels(3G) OpenGL Reference gluBuild3DMipmapLevels(3G)
NOTES
gluBuild3DMipmapLevels 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.
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, height, or depth is < 1.
GLU_INVALID_ENUM is returned if internalFormat, format, or type is 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 GL_BGRA.
GLU_INVALID_OPERATION is returned if type is GL_UNSIGNED_SHORT_5_5_5_1 or
GL_UNSIGNED_SHORT_1_5_5_5_REV and format is neither GL_RGBA nor GL_BGRA.
GLU_INVALID_OPERATION is returned if type is GL_UNSIGNED_INT_8_8_8_8 or
GL_UNSIGNED_INT_8_8_8_8_REV and format is neither GL_RGBA nor GL_BGRA.
GLU_INVALID_OPERATION is returned if type is GL_UNSIGNED_INT_10_10_10_2
or GL_UNSIGNED_INT_2_10_10_10_REV and format is neither GL_RGBA nor
GL_BGRA.
glDrawPixels, glTexImage1D, glTexImage2D, glTexImage3D,
gluBuild1DMipmaps, gluBuild2DMipmaps, gluBuild3DMipmaps, gluErrorString,
glGetTexImage, glGetTexLevelParameter, gluBuild1DMipmapLevels,
gluBuild2DMipmapLevels
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