GLGETTEXLEVELPARAMETER - Online Linux Manual PageSection : 3G
NAME"glGetTexLevelParameterfv, glGetTexLevelParameteriv − return texture parameter values for a specific level of detail
C SPECIFICATIONvoid glGetTexLevelParameterfv( GLenum target, GLint level, GLenum pname, GLfloat *params )void glGetTexLevelParameteriv( GLenum target, GLint level, GLenum pname, GLint *params )
PARAMETERStarget  Specifies the symbolic name of the target texture, either ­GL_TEXTURE_1D, ­GL_TEXTURE_2D, ­GL_TEXTURE_3D, ­GL_PROXY_TEXTURE_1D, ­GL_PROXY_TEXTURE_2D, or ­GL_PROXY_TEXTURE_3D. level  Specifies the level-of-detail number of the desired image. Level 0 is the base image level. Level n is the nth mipmap reduction image. pname  Specifies the symbolic name of a texture parameter. ­GL_TEXTURE_WIDTH, ­GL_TEXTURE_HEIGHT, ­GL_TEXTURE_DEPTH, ­GL_TEXTURE_INTERNAL_FORMAT, ­GL_TEXTURE_BORDER, ­GL_TEXTURE_RED_SIZE, ­GL_TEXTURE_GREEN_SIZE, ­GL_TEXTURE_BLUE_SIZE, ­GL_TEXTURE_ALPHA_SIZE, ­GL_TEXTURE_LUMINANCE_SIZE, and ­GL_TEXTURE_INTENSITY_SIZE are accepted. params  Returns the requested data.
DESCRIPTION­glGetTexLevelParameter returns in params texture parameter values for a specific level-of-detail value, specified as level. target defines the target texture, either ­GL_TEXTURE_1D, ­GL_TEXTURE_2D, ­GL_TEXTURE_3D, ­GL_PROXY_TEXTURE_1D, ­GL_PROXY_TEXTURE_2D, or ­GL_PROXY_TEXTURE_3D. .BR ­GL_MAX_TEXTURE_SIZE, and ­GL_MAX_3D_TEXTURE_SIZE are not really descriptive enough. It has to report the largest square texture image that can be accommodated with mipmaps and borders, but a long skinny texture, or a texture without mipmaps and borders, may easily fit in texture memory. The proxy targets allow the user to more accurately query whether the GL can accommodate a texture of a given configuration. If the texture cannot be accommodated, the texture state variables, which may be queried with ­glGetTexLevelParameter, are set to 0. If the texture can be accommodated, the texture state values will be set as they would be set for a non-proxy target. pname specifies the texture parameter whose value or values will be returned. The accepted parameter names are as follows: ­GL_TEXTURE_WIDTH  params returns a single value, the width of the texture image. This value includes the border of the texture image. The initial value is 0. ­GL_TEXTURE_HEIGHT  params returns a single value, the height of the texture image. This value includes the border of the texture image. The initial value is 0. ­GL_TEXTURE_DEPTH  params returns a single value, the depth of the texture image. This value includes the border of the texture image. The initial value is 0. ­GL_TEXTURE_INTERNAL_FORMAT  params returns a single value, the internal of the texture image. ­GL_TEXTURE_BORDER  params returns a single value, the width in pixels of the border of the texture image. The initial value is 0. ­GL_TEXTURE_RED_SIZE,  ­GL_TEXTURE_GREEN_SIZE,  ­GL_TEXTURE_BLUE_SIZE,  ­GL_TEXTURE_ALPHA_SIZE,  ­GL_TEXTURE_LUMINANCE_SIZE,  ­GL_TEXTURE_INTENSITY_SIZE  The internal storage resolution of an individual component. The resolution chosen by the GL will be a close match for the resolution requested by the user with the component argument of ­glTexImage1D, ­glTexImage2D, ­glTexImage3D, ­glCopyTexImage1D, and ­glCopyTexImage2D. The initial value is 0.
NOTESIf an error is generated, no change is made to the contents of params. ­GL_TEXTURE_INTERNAL_FORMAT is available only if the GL version is 1.1 or greater. In version 1.0, use ­GL_TEXTURE_COMPONENTS instead. ­GL_PROXY_TEXTURE_1D and ­GL_PROXY_TEXTURE_2D are available only if the GL version is 1.1 or greater. ­GL_TEXTURE_3D, ­GL_PROXY_TEXTURE_3D, and ­GL_TEXTURE_DEPTH are available only if the GL version is 1.2 or greater. When the ­GL_ARB_multitexture extension is supported, ­glGetTexLevelParameter returns the texture level parameters for the active texture unit.
ERRORS­GL_INVALID_ENUM is generated if target or pname is not an accepted value. ­GL_INVALID_VALUE is generated if level is less than 0. ­GL_INVALID_VALUE may be generated if level is greater than log2 max, where max is the returned value of ­GL_MAX_TEXTURE_SIZE. ­GL_INVALID_OPERATION is generated if ­glGetTexLevelParameter is executed between the execution of ­glBegin and the corresponding execution of ­glEnd.
SEE ALSO­glActiveTextureARB(3G), ­glGetTexParameter(3G), ­glCopyTexImage1D(3G), ­glCopyTexImage2D(3G), ­glCopyTexSubImage1D(3G), ­glCopyTexSubImage2D(3G), ­glCopyTexSubImage3D(3G), ­glTexEnv(3G), ­glTexGen(3G), ­glTexImage1D(3G), ­glTexImage2D(3G), ­glTexImage3D(3G), ­glTexSubImage1D(3G), ­glTexSubImage2D(3G), ­glTexSubImage3D(3G), ­glTexParameter(3G) 0
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