Provided by: opengl-4-man-doc_1.0~svn33624-1_all 
NAME
glTextureView - initialize a texture as a data alias of another texture's data store
C SPECIFICATION
void glTextureView(GLuint texture, GLenum target, GLuint origtexture,
GLenum internalformat, GLuint minlevel, GLuint numlevels,
GLuint minlayer, GLuint numlayers);
PARAMETERS
texture
Specifies the texture object to be initialized as a view.
target
Specifies the target to be used for the newly initialized texture.
origtexture
Specifies the name of a texture object of which to make a view.
internalFormat
Specifies the internal format for the newly created view.
minlevel
Specifies lowest level of detail of the view.
numlevels
Specifies the number of levels of detail to include in the view.
minlayer
Specifies the index of the first layer to include in the view.
numlayers
Specifies the number of layers to include in the view.
DESCRIPTION
glTextureView initializes a texture object as an alias, or view of another texture object,
sharing some or all of the parent texture's data store with the initialized texture.
texture specifies a name previously reserved by a successful call to glGenTextures() but
that has not yet been bound or given a target. target specifies the target for the newly
initialized texture and must be compatible with the target of the parent texture, given in
origtexture as specified in the following table:
┌────────────────────────────────┬──────────────────────────────┐
│Original Target │ Compatible New Targets │
├────────────────────────────────┼──────────────────────────────┤
│GL_TEXTURE_1D │ GL_TEXTURE_1D, │
│ │ GL_TEXTURE_1D_ARRAY │
├────────────────────────────────┼──────────────────────────────┤
│GL_TEXTURE_2D │ GL_TEXTURE_2D, │
│ │ GL_TEXTURE_2D_ARRAY │
├────────────────────────────────┼──────────────────────────────┤
│GL_TEXTURE_3D │ GL_TEXTURE_3D │
├────────────────────────────────┼──────────────────────────────┤
│GL_TEXTURE_CUBE_MAP │ GL_TEXTURE_CUBE_MAP, │
│ │ GL_TEXTURE_2D, │
│ │ GL_TEXTURE_2D_ARRAY, │
│ │ GL_TEXTUER_CUBE_MAP_ARRAY │
├────────────────────────────────┼──────────────────────────────┤
│GL_TEXTURE_RECTANGLE │ GL_TEXTURE_RECTANGLE │
├────────────────────────────────┼──────────────────────────────┤
│GL_TEXTURE_BUFFER │ none │
├────────────────────────────────┼──────────────────────────────┤
│GL_TEXTURE_1D_ARRAY │ GL_TEXTURE_1D, │
│ │ GL_TEXTURE_1D_ARRAY │
├────────────────────────────────┼──────────────────────────────┤
│GL_TEXTURE_2D_ARRAY │ GL_TEXTURE_2D, │
│ │ GL_TEXTURE_2D_ARRAY │
├────────────────────────────────┼──────────────────────────────┤
│GL_TEXTURE_CUBE_MAP_ARRAY │ GL_TEXTURE_CUBE_MAP, │
│ │ GL_TEXTURE_2D, │
│ │ GL_TEXTURE_2D_ARRAY, │
│ │ GL_TEXTUER_CUBE_MAP_ARRAY │
├────────────────────────────────┼──────────────────────────────┤
│GL_TEXTURE_2D_MULTISAMPLE │ GL_TEXTURE_2D_MULTISAMPLE, │
│ │ GL_TEXTURE_MULTISAMPLE_ARRAY │
├────────────────────────────────┼──────────────────────────────┤
│GL_TEXTURE_2D_MULTISAMPLE_ARRAY │ GL_TEXTURE_2D_MULTISAMPLE, │
│ │ GL_TEXTURE_MULTISAMPLE_ARRAY │
└────────────────────────────────┴──────────────────────────────┘
The value of GL_TEXTURE_IMMUTABLE_FORMAT for origtexture must be GL_TRUE. After
initialization, texture inherits the data store of the parent texture, origtexture and is
usable as a normal texture object with target target. Data in the shared store is
reinterpreted with the new internal format specified by internalformat. internalformat
must be compatible with the internal format of the parent texture as specified in the
following table:
┌──────────────┬─────────────────────────────────────────────────────────┐
│Class │ Internal Formats │
├──────────────┼─────────────────────────────────────────────────────────┤
│128-bit │ GL_RGBA32F, GL_RGBA32UI, │
│ │ GL_RGBA32I │
├──────────────┼─────────────────────────────────────────────────────────┤
│96-bit │ GL_RGB32F, GL_RGB32UI, GL_RGB32I │
├──────────────┼─────────────────────────────────────────────────────────┤
│64-bit │ GL_RGBA16F, GL_RG32F, │
│ │ GL_RGBA16UI, │
│ │ GL_RG32UI, │
│ │ GL_RGBA16I, GL_RG32I, GL_RGBA16, │
│ │ GL_RGBA16_SNORM │
├──────────────┼─────────────────────────────────────────────────────────┤
│48-bit │ GL_RGB16, GL_RGB16_SNORM, │
│ │ GL_RGB16F, GL_RGB16UI, GL_RGB16I │
├──────────────┼─────────────────────────────────────────────────────────┤
│32-bit │ GL_RG16F, GL_R11F_G11F_B10F, │
│ │ GL_R32F, GL_RGB10_A2UI, │
│ │ GL_RGBA8UI, │
│ │ GL_RG16UI, GL_R32UI, GL_RGBA8I, │
│ │ GL_RG16I, │
│ │ GL_R32I, GL_RGB10_A2, GL_RGBA8, │
│ │ GL_RG16, │
│ │ GL_RGBA8_SNORM, GL_RG16_SNORM, │
│ │ GL_SRGB8_ALPHA8, │
│ │ GL_RGB9_E5 │
├──────────────┼─────────────────────────────────────────────────────────┤
│24-bit │ GL_RGB8, GL_RGB8_SNORM, GL_SRGB8, │
│ │ GL_RGB8UI, │
│ │ GL_RGB8I │
├──────────────┼─────────────────────────────────────────────────────────┤
│16-bit │ GL_R16F, GL_RG8UI, GL_R16UI, GL_RG8I, │
│ │ GL_R16I, │
│ │ GL_RG8, GL_R16, GL_RG8_SNORM, GL_R16_SNORM │
├──────────────┼─────────────────────────────────────────────────────────┤
│8-bit │ GL_R8UI, GL_R8I, GL_R8, GL_R8_SNORM │
├──────────────┼─────────────────────────────────────────────────────────┤
│GL_RGTC1_RED │ GL_COMPRESSED_RED_RGTC1, GL_COMPRESSED_SIGNED_RED_RGTC1 │
├──────────────┼─────────────────────────────────────────────────────────┤
│GL_RGTC2_RG │ GL_COMPRESSED_RG_RGTC2, GL_COMPRESSED_SIGNED_RG_RGTC2 │
├──────────────┼─────────────────────────────────────────────────────────┤
│GL_BPTC_UNORM │ GL_COMPRESSED_RGBA_BPTC_UNORM, │
│ │ GL_COMPRESSED_SRGB_ALPHA_BPTC_UNORM │
├──────────────┼─────────────────────────────────────────────────────────┤
│GL_BPTC_FLOAT │ GL_COMPRESSED_RGB_BPTC_SIGNED_FLOAT, │
│ │ GL_COMPRESSED_RGB_BPTC_UNSIGNED_FLOAT │
└──────────────┴─────────────────────────────────────────────────────────┘
If the original texture is an array or has multiple mipmap levels, the parameters
minlayer, numlayers, minlevel, and numlevels control which of those slices and levels are
considered part of the texture. The minlevel and minlayer parameters are relative to the
view of the original texture. If numlayers or numlevels extend beyond the original
texture, they are clamped to the max extent of the original texture.
If the new texture's target is GL_TEXTURE_CUBE_MAP, the clamped numlayers must be equal to
6. If the new texture's target is GL_TEXTURE_CUBE_MAP_ARRAY, then numlayers counts
layer-faces rather than layers, and the clamped numlayers must be a multiple of 6. If the
new texture's target is GL_TEXTURE_CUBE_MAP or GL_TEXTURE_CUBE_MAP_ARRAY, the width and
height of the original texture's levels must be equal.
When the original texture's target is GL_TEXTURE_CUBE_MAP, the layer parameters are
interpreted in the same order as if it were a GL_TEXTURE_CUBE_MAP_ARRAY with 6
layer-faces.
If target is GL_TEXTURE_1D, GL_TEXTURE_2D, GL_TEXTURE_3D, GL_TEXTURE_RECTANGLE, or
GL_TEXTURE_2D_MULTISAMPLE, numlayers must equal 1.
The dimensions of the original texture must be less than or equal to the maximum supported
dimensions of the new target. For example, if the original texture has a
GL_TEXTURE_2D_ARRAY target and its width is greater than GL_MAX_CUBE_MAP_TEXTURE_SIZE, an
error will be generated if glTextureView is called to create a GL_TEXTURE_CUBE_MAP view.
Texture commands that take a level or layer parameter, such as glTexSubImage2D(),
interpret that parameter to be relative to the view of the texture. i.e. the mipmap level
of the data store that would be updated via glTexSubImage2D() would be the sum of level
and the value of GL_TEXTURE_VIEW_MIN_LEVEL.
ERRORS
GL_INVALID_VALUE is generated if minlayer or minlevel are larger than the greatest layer
or level of origtexture.
GL_INVALID_OPERATION is generated if target is not compatible with the target of
origtexture.
GL_INVALID_OPERATION is generated if the dimensions of origtexture are greater than the
maximum supported dimensions for target.
GL_INVALID_OPERATION is generated if internalformat is not compatible with the internal
format of origtexture.
GL_INVALID_OPERATION is generated if texture has already been bound or otherwise given a
target.
GL_INVALID_OPERATION is generated if the value of GL_TEXTURE_IMMUTABLE_FORMAT for
origtexture is not GL_TRUE.
GL_INVALID_OPERATION is generated if origtexture is not the name of an existing texture
object.
GL_INVALID_VALUE is generaged if target is GL_TEXTURE_CUBE_MAP and numlayers is not 6, or
if target is GL_TEXTURE_CUBE_MAP_ARRAY and numlayers is not an integer multiple of 6.
GL_INVALID_VALUE is generated if target is GL_TEXTURE_1D, GL_TEXTURE_2D, GL_TEXTURE_3D,
GL_TEXTURE_RECTANGLE, or GL_TEXTURE_2D_MULTISAMPLE and numlayers does not equal 1.
GL_INVALID_VALUE is generated if texture zero or is not the name of a texture previously
returned from a successful call to glGenTextures().
ASSOCIATED GETS
glTexParameter() with arguments GL_TEXTURE_VIEW_MIN_LEVEL, GL_TEXTURE_VIEW_NUM_LEVELS,
GL_TEXTURE_VIEW_MIN_LAYER, GL_TEXTURE_VIEW_NUM_LAYERS, or GL_TEXTURE_IMMUTABLE_LEVELS.
VERSION SUPPORT
┌──────────────┬───────────────────────────────────────────────────────────────────────┐
│ │ OpenGL Version │
├──────────────┼─────┬─────┬─────┬─────┬─────┬─────┬─────┬─────┬─────┬─────┬─────┬─────┤
│Function │ 2.0 │ 2.1 │ 3.0 │ 3.1 │ 3.2 │ 3.3 │ 4.0 │ 4.1 │ 4.2 │ 4.3 │ 4.4 │ 4.5 │
│/ │ │ │ │ │ │ │ │ │ │ │ │ │
│Feature │ │ │ │ │ │ │ │ │ │ │ │ │
│Name │ │ │ │ │ │ │ │ │ │ │ │ │
├──────────────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┤
│glTextureView │ - │ - │ - │ - │ - │ - │ - │ - │ - │ ✔ │ ✔ │ ✔ │
└──────────────┴─────┴─────┴─────┴─────┴─────┴─────┴─────┴─────┴─────┴─────┴─────┴─────┘
SEE ALSO
glTexStorage1D(), glTexStorage2D(), glTexStorage3D(), glGetTexParameter().
COPYRIGHT
Copyright © 2013-2014 Khronos Group. This material may be distributed subject to the terms
and conditions set forth in the Open Publication License, v 1.0, 8 June 1999.
http://opencontent.org/openpub/.
COPYRIGHT
Copyright © 2013-2014 Khronos Group
[FIXME: source] 01/03/2018 GLTEXTUREVIEW(3G)