glTextureView man page on RedHat
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GLTEXTUREVIEW(3G) OpenGL Manual GLTEXTUREVIEW(3G)
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 TexSubImage2D() 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.
SEE ALSO
glTexStorage1D(), glTexStorage2D(), glTexStorage3D(),
glGetTexParameter().
COPYRIGHT
Copyright © 2012 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/.
AUTHORS
opengl.org
opengl.org 03/16/2013 GLTEXTUREVIEW(3G)
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