glTexParameterf, glTexParameteri, glTexParameterfv, glTexParameteriv - set texture parameters
void glTexParameterf( GLenum target, GLenum pname, GLfloat param ) void glTexParameteri( GLenum target, GLenum pname, GLint param )
target Specifies the target texture, which must be either GL_TEXTURE_1D or GL_TEXTURE_2D. pname Specifies the symbolic name of a single-valued texture parameter. pname can be one of the following: GL_TEXTURE_MIN_FILTER, GL_TEXTURE_MAG_FILTER, GL_TEXTURE_WRAP_S, or GL_TEXTURE_WRAP_T. param Specifies the value of pname.
void glTexParameterfv( GLenum target, GLenum pname, const GLfloat *params ) void glTexParameteriv( GLenum target, GLenum pname, const GLint *params )
target
Specifies the target texture, which must be either GL_TEXTURE_1D or
GL_TEXTURE_2D.
pname
Specifies the symbolic name of a texture parameter. pname can be one
of the following: GL_TEXTURE_MIN_FILTER, GL_TEXTURE_MAG_FILTER,
GL_TEXTURE_WRAP_S, GL_TEXTURE_WRAP_T, or GL_TEXTURE_BORDER_COLOR.
params
Specifies a pointer to an array where the value or values of pname are
stored.
Texture mapping is a technique that applies an image onto an object's surface as if the image were a decal or cellophane shrink-wrap. The image is created in texture space, with an (s, t) coordinate system. A texture is a one- or two-dimensional image and a set of parameters that determine how samples are derived from the image. glTexParameter assigns the value or values in params to the texture parameter specified as pname. target defines the target texture, either GL_TEXTURE_1D or GL_TEXTURE_2D. The following symbols are accepted in pname: GL_TEXTURE_MIN_FILTER The texture minifying function is used whenever the pixel being textured maps to an area greater than one texture element. There are six defined minifying functions. Two of them use the nearest one or nearest four texture elements to compute the texture value. The other four use mipmaps. A mipmap is an ordered set of arrays representing the same image at progressively lower resolutions. If the texture has dimensions 2nx2m there are max(n,m)+1 mipmaps. The first mipmap is the original texture, with dimensions 2nx2m. Each subsequent mipmap has dimensions 2k-1x2l-1 where 2kx2l are the dimensions of the previous mipmap, until either k=0 or l=0. At that point, subsequent mipmaps have dimension 1x2l-1 or 2k-1x1 until the final mipmap, which has dimension 1x1. Mipmaps are defined using glTexImage1D or glTexImage2D with the level-of-detail argument indicating the order of the mipmaps. Level 0 is the original texture; level max(n,m) is the final 1x1 mipmap. params supplies a function for minifying the texture as one of the following: GL_NEAREST Returns the value of the texture element that is nearest (in Manhattan distance) to the center of the pixel being textured. GL_LINEAR Returns the weighted average of the four texture elements that are closest to the center of the pixel being textured. These can include border texture elements, depending on the values of GL_TEXTURE_WRAP_S and GL_TEXTURE_WRAP_T, and on the exact mapping. GL_NEAREST_MIPMAP_NEAREST Chooses the mipmap that most closely matches the size of the pixel being textured and uses the GL_NEAREST criterion (the texture element nearest to the center of the pixel) to produce a texture value. GL_LINEAR_MIPMAP_NEAREST Chooses the mipmap that most closely matches the size of the pixel being textured and uses the GL_LINEAR criterion (a weighted average of the four texture elements that are closest to the center of the pixel) to produce a texture value. GL_NEAREST_MIPMAP_LINEAR Chooses the two mipmaps that most closely match the size of the pixel being textured and uses the GL_NEAREST criterion (the texture element nearest to the center of the pixel) to produce a texture value from each mipmap. The final texture value is a weighted average of those two values. GL_LINEAR_MIPMAP_LINEAR Chooses the two mipmaps that most closely match the size of the pixel being textured and uses the GL_LINEAR criterion (a weighted average of the four texture elements that are closest to the center of the pixel) to produce a texture value from each mipmap. The final texture value is a weighted average of those two values. As more texture elements are sampled in the minification process, fewer aliasing artifacts will be apparent. While the GL_NEAREST and GL_LINEAR minification functions can be faster than the other four, they sample only one or four texture elements to determine the texture value of the pixel being rendered and can produce moire patterns or ragged transitions. The default value of GL_TEXTURE_MIN_FILTER is GL_NEAREST_MIPMAP_LINEAR. GL_TEXTURE_MAG_FILTER The texture magnification function is used when the pixel being textured maps to an area less than or equal to one texture element. It sets the texture magnification function to either of the following: GL_NEAREST Returns the value of the texture element that is nearest (in Manhattan distance) to the center of the pixel being textured. GL_LINEAR Returns the weighted average of the four texture elements that are closest to the center of the pixel being textured. These can include border texture elements, depending on the values of GL_TEXTURE_WRAP_S and GL_TEXTURE_WRAP_T, and on the exact mapping. GL_NEAREST is generally faster than GL_LINEAR, but it can produce textured images with sharper edges because the transition between texture elements is not as smooth. The default value of GL_TEXTURE_MAG_FILTER is GL_LINEAR. GL_TEXTURE_WRAP_S Sets the wrap parameter for texture coordinate s to either GL_CLAMP or GL_REPEAT. GL_CLAMP causes s coordinates to be clamped to the range [0,1] and is useful for preventing wrapping artifacts when mapping a single image onto an object. GL_REPEAT causes the integer part of the s coordinate to be ignored; the GL uses only the fractional part, thereby creating a repeating pattern. Border texture elements are accessed only if wrapping is set to GL_CLAMP. Initially, GL_TEXTURE_WRAP_S is set to GL_REPEAT. GL_TEXTURE_WRAP_T Sets the wrap parameter for texture coordinate t to either GL_CLAMP or GL_REPEAT. See the discussion under GL_TEXTURE_WRAP_S. Initially, GL_TEXTURE_WRAP_T is set to GL_REPEAT. GL_TEXTURE_BORDER_COLOR Sets a border color. params contains four values that comprise the RGBA color of the texture border. Integer color components are interpreted linearly such that the most positive integer maps to 1.0, and the most negative integer maps to -1.0. The values are clamped to the range [0,1] when they are specified. Initially, the border color is (0, 0, 0, 0).
Suppose texturing is enabled (by calling glEnable with argument GL_TEXTURE_1D or GL_TEXTURE_2D) and GL_TEXTURE_MIN_FILTER is set to one of the functions that requires a mipmap. If either the dimensions of the texture images currently defined (with previous calls to glTexImage1D or glTexImage2D) do not follow the proper sequence for mipmaps (described above), or there are fewer texture images defined than are needed, or the set of texture images have differing numbers of texture components, then it is as if texture mapping were disabled. Linear filtering accesses the four nearest texture elements only in 2-D textures. In 1-D textures, linear filtering accesses the two nearest texture elements.
GL_INVALID_ENUM is generated when target or pname is not one of the accepted defined values, or when params should have a defined constant value (based on the value of pname) and does not. GL_INVALID_OPERATION is generated if glTexParameter is called between a call to glBegin and the corresponding call to glEnd.
glGetTexParameter glGetTexLevelParameter
glTexEnv, glTexImage1D, glTexImage2D, glTexGen
Introduction | Alphabetic | Specification
Last Edited: Mon, May 22, 1995