GLUBUILD2DMIPMAPLEVELS - Online Linux Manual PageSection : 3G
NAME"gluBuild2DMipmapLevels − builds a subset of two-dimensional mipmap levels
C SPECIFICATIONGLint gluBuild2DMipmapLevels( GLenum target, GLint internalFormat, GLsizei width, GLsizei height, GLenum format, GLenum type, GLint level, GLint base, GLint max, const void *data )
PARAMETERStarget  Specifies the target texture. Must be ­GL_TEXTURE_2D. internalFormat  Requests the internal storage of the texture image. The most current version of the SGI implementation of GLU does not check this value for validity before passing it on to the underlying OpenGL implementation. A value that is not accepted by the OpenGL implementation will lead to an OpenGL error. The benefit of not checking this value at the GLU level is that OpenGL extensions can add new internal texture formats without requiring a revision of the GLU implementation. Older implementations of GLU check this value and raise a GLU error if it is not 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, height  Specifies the width and height, respectively, in pixels of the texture image. These should be a power of 2. format  Specifies the 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 glTexImage2D. max  Specifies the maximum mipmap level to pass to glTexImage2D. data  Specifies a pointer to the image data in memory.
DESCRIPTION­gluBuild2DMipmapLevels builds a subset of prefiltered two-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~times~1 is reached. At each level, each texel in the halved mipmap level is an average of the corresponding four texels in the larger mipmap level. (In the case of rectangular images, the decimation will ultimately reach an N~times~1 or 1~times~N configuration. Here, two texels are averaged instead.) glTexImage2D 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 and height is 8, the following levels are possible: 16~times~8, 8~times~4, 4~times~2, 2~times~1, 1~times~1. These correspond to levels 2 through 6 respectively. If base is 3 and max is 5, then only mipmap levels 8~times~4, 4~times~2 and 2~times~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(max(width,height)*(2^level)). 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.
NOTES­gluBuild2DMipmapLevels 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.
ERRORS­GLU_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 or height 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.
SEE ALSOglDrawPixels(3G), glTexImage1D(3G), glTexImage2D(3G), glTexImage3D(3G), ­gluBuild1DMipmaps(3G), ­gluBuild2DMipmaps(3G), ­gluBuild3DMipmaps(3G), ­gluErrorString(3G), glGetTexImage(3G), glGetTexLevelParameter(3G), ­gluBuild1DMipmapLevels(3G), ­gluBuild3DMipmapLevels(3G) 0
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