fgluBuild1DMipmapLevels(3G) OpenGL Reference fgluBuild1DMipmapLevels(3G)NAME
fgluBuild1DMipmapLevels - builds a subset of one-dimensional mipmap
levels
FORTRAN SPECIFICATION
INTEGER*4 fgluBuild1DMipmapLevels( INTEGER*4 target,
INTEGER*4 internalFormat,
INTEGER*4 width,
INTEGER*4 format,
INTEGER*4 type,
INTEGER*4 level,
INTEGER*4 base,
INTEGER*4 max,
void data )
PARAMETERS
target Specifies the target texture. Must be GL_TEXTURE_1D.
internalFormat Requests the internal storage format of the texture
image. Must be 1, 2, 3, or 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 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
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fgluBuild1DMipmapLevels(3G) OpenGL Reference fgluBuild1DMipmapLevels(3G)
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
glTexImage1D.
max Specifies the maximum mipmap level to pass to
glTexImage1D.
data Specifies a pointer to the image data in memory.
DESCRIPTION
fgluBuild1DMipmapLevels builds a subset 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 fgluErrorString).
A series of mipmap levels from base to max is built by decimating 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 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
fgluErrorString) and nothing is loaded.
For example, if level is 2 and width is 16, the following levels are
possible: 16 x 1, 8 x 1, 4 x 1, 2 x 1, 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 1, 4 x 1 and 2 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
log2(width2level).
See the glTexImage1D reference page for a description of the acceptable
values for type parameter. See the glDrawPixels reference page for a
description of the acceptable values for level parameter.
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fgluBuild1DMipmapLevels(3G) OpenGL Reference fgluBuild1DMipmapLevels(3G)NOTES
fgluBuild1DMipmapLevels 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 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.
SEE ALSO
glDrawPixels, glTexImage1D, glTexImage2D, glTexImage3D,
fgluBuild1DMipmaps, fgluBuild2DMipmaps, fgluBuild3DMipmaps,
fgluErrorString, glGetTexImage, glGetTexLevelParameter,
fgluBuild2DMipmapLevels, fgluBuild3DMipmapLevels
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