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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 (C) 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				    06/10/2014				GLTEXTUREVIEW(3G)
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