Builds a subset of one-dimensional mipmap levels.
A return value of zero indicates success, otherwise a GLU error code is returned (see gluErrorString).
gluBuild1DMipmapLevels 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 gluErrorString).
A series of mipmap levels from min 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. glTexImage2D is called to load these mipmap levels from min 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 min 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((width)*(2^level))
.
See the glTexImage2D 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.
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 > min, min < 0, max < min 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.
Glu Class | Tao.OpenGl Namespace | Glu.gluBuild1DMipmapLevels Overload List | glDrawPixels | glGetTexImage | glGetTexLevelParameteriv | glTexImage1D | glTexImage2D | glTexImage3D | gluBuild1DMipmaps | gluBuild2DMipmapLevels | gluBuild2DMipmaps | gluBuild3DMipmapLevels | gluBuild3DMipmaps | gluErrorString