GLGETTEXLEVELPARAMET - Online Linux Manual PageSection : 3G
Updated : 01/20/2022
Source : [FIXME: source]
Note : [FIXME: manual]
NAMEglGetTexLevelParameter − 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); void glGetTextureLevelParameterfv(GLuint texture, GLint level, GLenum pname, GLfloat *params); void glGetTextureLevelParameteriv(GLuint texture, GLint level, GLenum pname, GLint *params);
PARAMETERStarget Specifies the target to which the texture is bound for glGetTexLevelParameterfv and glGetTexLevelParameteriv functions​. Must be one of the following values: GL_TEXTURE_1D, GL_TEXTURE_2D, GL_TEXTURE_3D, GL_TEXTURE_1D_ARRAY, GL_TEXTURE_2D_ARRAY, GL_TEXTURE_RECTANGLE, GL_TEXTURE_2D_MULTISAMPLE, GL_TEXTURE_2D_MULTISAMPLE_ARRAY, GL_TEXTURE_CUBE_MAP_POSITIVE_X, GL_TEXTURE_CUBE_MAP_NEGATIVE_X, GL_TEXTURE_CUBE_MAP_POSITIVE_Y, GL_TEXTURE_CUBE_MAP_NEGATIVE_Y, GL_TEXTURE_CUBE_MAP_POSITIVE_Z, GL_TEXTURE_CUBE_MAP_NEGATIVE_Z, GL_PROXY_TEXTURE_1D, GL_PROXY_TEXTURE_2D, GL_PROXY_TEXTURE_3D, GL_PROXY_TEXTURE_1D_ARRAY, GL_PROXY_TEXTURE_2D_ARRAY, GL_PROXY_TEXTURE_RECTANGLE, GL_PROXY_TEXTURE_2D_MULTISAMPLE, GL_PROXY_TEXTURE_2D_MULTISAMPLE_ARRAY, GL_PROXY_TEXTURE_CUBE_MAP, or GL_TEXTURE_BUFFER​. texture Specifies the texture object name for glGetTextureLevelParameterfv and glGetTextureLevelParameteriv functions​. 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_RED_SIZE, GL_TEXTURE_GREEN_SIZE, GL_TEXTURE_BLUE_SIZE, GL_TEXTURE_ALPHA_SIZE, GL_TEXTURE_DEPTH_SIZE, GL_TEXTURE_COMPRESSED, GL_TEXTURE_COMPRESSED_IMAGE_SIZE, and GL_TEXTURE_BUFFER_OFFSET are accepted​. params Returns the requested data​.
DESCRIPTIONglGetTexLevelParameterfv, glGetTexLevelParameteriv, glGetTextureLevelParameterfv and glGetTextureLevelParameteriv return in params texture parameter values for a specific level−of−detail value, specified as level​. For the first two functions, target defines the target texture, either GL_TEXTURE_1D, GL_TEXTURE_2D, GL_TEXTURE_3D, GL_PROXY_TEXTURE_1D, GL_PROXY_TEXTURE_2D, GL_PROXY_TEXTURE_3D, GL_TEXTURE_CUBE_MAP_POSITIVE_X, GL_TEXTURE_CUBE_MAP_NEGATIVE_X, GL_TEXTURE_CUBE_MAP_POSITIVE_Y, GL_TEXTURE_CUBE_MAP_NEGATIVE_Y, GL_TEXTURE_CUBE_MAP_POSITIVE_Z, GL_TEXTURE_CUBE_MAP_NEGATIVE_Z, or GL_PROXY_TEXTURE_CUBE_MAP​. The remaining two take a texture argument which specifies the name of the texture object​. 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 but a long skinny texture, or a texture without mipmaps 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 and glGetTextureLevelParameter, 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​. The initial value is 0​. GL_TEXTURE_HEIGHT params returns a single value, the height of the texture image​. The initial value is 0​. GL_TEXTURE_DEPTH params returns a single value, the depth of the texture image​. The initial value is 0​. GL_TEXTURE_INTERNAL_FORMAT params returns a single value, the internal format of the texture image​. GL_TEXTURE_RED_TYPE, GL_TEXTURE_GREEN_TYPE, GL_TEXTURE_BLUE_TYPE, GL_TEXTURE_ALPHA_TYPE, GL_TEXTURE_DEPTH_TYPE The data type used to store the component​. The types GL_NONE, GL_SIGNED_NORMALIZED, GL_UNSIGNED_NORMALIZED, GL_FLOAT, GL_INT, and GL_UNSIGNED_INT may be returned to indicate signed normalized fixed−point, unsigned normalized fixed−point, floating−point, integer unnormalized, and unsigned integer unnormalized components, respectively​. GL_TEXTURE_RED_SIZE, GL_TEXTURE_GREEN_SIZE, GL_TEXTURE_BLUE_SIZE, GL_TEXTURE_ALPHA_SIZE, GL_TEXTURE_DEPTH_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​. GL_TEXTURE_COMPRESSED params returns a single boolean value indicating if the texture image is stored in a compressed internal format​. The initiali value is GL_FALSE​. GL_TEXTURE_COMPRESSED_IMAGE_SIZE params returns a single integer value, the number of unsigned bytes of the compressed texture image that would be returned from glGetCompressedTexImage()​. GL_TEXTURE_BUFFER_OFFSET params returns a single integer value, the offset into the data store of the buffer bound to a buffer texture​. glTexBufferRange()​. GL_TEXTURE_BUFFER_SIZE params returns a single integer value, the size of the range of a data store of the buffer bound to a buffer texture​. glTexBufferRange()​.
NOTESIf an error is generated, no change is made to the contents of params​. glGetTexLevelParameter returns the texture level parameters for the active texture unit​. GL_TEXTURE_BUFFER_OFFSET and GL_TEXTURE_BUFFER_SIZE are available only if the GL version is 4​.3 or greater​.
ERRORSGL_INVALID_OPERATION is generated by glGetTextureLevelParameterfv and glGetTextureLevelParameteriv functions if texture is not the name of an existing texture object​. GL_INVALID_ENUM is generated by glGetTexLevelParameterfv and glGetTexLevelParameteriv functions 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 log 2 max, where max is the returned value of GL_MAX_TEXTURE_SIZE​. GL_INVALID_VALUE is generated if target is GL_TEXTURE_BUFFER and level is not zero​. GL_INVALID_OPERATION is generated if GL_TEXTURE_COMPRESSED_IMAGE_SIZE is queried on texture images with an uncompressed internal format or on proxy targets​.
VERSION SUPPORT OpenGL Version Function / Feature Name 2​.0 none;'>none;'>none;'>none;'>none;'>none;'>none;'>none;'>none;'>none;'>none;'>none;'>none;'> 2​.1 3​.0 3​.1 3​.2 3​.3 4​.0 4​.1 4​.2 4​.3 4​.4 4​.5 glGetTexLevelParameterfv ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ glGetTexLevelParameteriv ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ glGetTextureLevelParameterfv − − − − − − − − − − − ✔ glGetTextureLevelParameteriv − − − − − − − − − − − ✔
SEE ALSOglActiveTexture(), glGetTexParameter(), glCopyTexImage1D(), glCopyTexImage2D(), glCopyTexSubImage1D(), glCopyTexSubImage2D(), glCopyTexSubImage3D(), glTexImage1D(), glTexImage2D(), glTexImage3D(), glTexSubImage1D(), glTexSubImage2D(), glTexSubImage3D(), glTexParameter()
COPYRIGHTCopyright © 1991−2006 Silicon Graphics, Inc​. Copyright © 2010−2014 Khronos Group​. This document is licensed under the SGI Free Software B License​. For details, see http://oss​.sgi​.com/projects/FreeB/​.
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