glCompressedTexImage3D — specify a three-dimensional texture image in a compressed format
void glCompressedTexImage3D( | GLenum | target, |
GLint | level, | |
GLenum | internalformat, | |
GLsizei | width, | |
GLsizei | height, | |
GLsizei | depth, | |
GLint | border, | |
GLsizei | imageSize, | |
const GLvoid * | data) ; |
target
Specifies the target texture.
Must be GL_TEXTURE_3D
, GL_PROXY_TEXTURE_3D
,
GL_TEXTURE_2D_ARRAY
or GL_PROXY_TEXTURE_2D_ARRAY
.
level
Specifies the level-of-detail number. Level 0 is the base image level. Level n is the nth mipmap reduction image.
internalformat
Specifies the format of the compressed image data stored at address data
.
width
Specifies the width of the texture image. All implementations support 3D texture images that are at least 16 texels wide.
height
Specifies the height of the texture image. All implementations support 3D texture images that are at least 16 texels high.
depth
Specifies the depth of the texture image. All implementations support 3D texture images that are at least 16 texels deep.
border
This value must be 0.
imageSize
Specifies the number of unsigned bytes of image data starting at the
address specified by data
.
data
Specifies a pointer to the compressed image data in memory.
Texturing allows elements of an image array to be read by shaders.
glCompressedTexImage3D
loads a previously defined, and retrieved, compressed three-dimensional
texture image if target
is GL_TEXTURE_3D
(see glTexImage3D).
If target
is GL_TEXTURE_2D_ARRAY
, data
is
treated as an array of compressed 2D textures.
If target
is GL_PROXY_TEXTURE_3D
or GL_PROXY_TEXTURE_2D_ARRAY
,
no data is read from data
, but
all of the texture image state is recalculated, checked for consistency,
and checked against the implementation's capabilities. If the
implementation cannot handle a texture of the requested texture size, it
sets all of the image state to 0, but does not generate an error (see
glGetError). To query for an entire mipmap array, use an image array level
greater than or equal to 1.
internalformat
must be a known compressed image format (such as GL_RGTC
)
or an extension-specified compressed-texture format.
When a texture is loaded with glTexImage2D using a generic compressed
texture format (e.g., GL_COMPRESSED_RGB
), the GL selects from one of
its extensions supporting compressed textures. In order to load the
compressed texture image using glCompressedTexImage3D
, query the compressed texture image's
size and format using glGetTexLevelParameter.
If a non-zero named buffer object is bound to the GL_PIXEL_UNPACK_BUFFER
target
(see glBindBuffer) while a texture image is
specified, data
is treated as a byte offset into the buffer object's data store.
GL_INVALID_ENUM
is generated if internalformat
is not one of the generic
compressed internal formats:
GL_COMPRESSED_RED
,
GL_COMPRESSED_RG
,
GL_COMPRESSED_RGB
,
GL_COMPRESSED_RGBA
.
GL_COMPRESSED_SRGB
, or
GL_COMPRESSED_SRGB_ALPHA
.
GL_INVALID_VALUE
is generated if imageSize
is not consistent with
the format, dimensions, and contents of the specified compressed image data.
GL_INVALID_VALUE
is generated if border
is not 0.
GL_INVALID_OPERATION
is generated if parameter combinations are not
supported by the specific compressed internal format as specified in the
specific texture compression extension.
GL_INVALID_OPERATION
is generated if a non-zero buffer object name is bound to the
GL_PIXEL_UNPACK_BUFFER
target and the buffer object's data store is currently mapped.
GL_INVALID_OPERATION
is generated if a non-zero buffer object name is bound to the
GL_PIXEL_UNPACK_BUFFER
target and the data would be unpacked from the buffer
object such that the memory reads required would exceed the data store size.
Undefined results, including abnormal program termination, are generated if data
is not encoded in a manner consistent with the extension specification defining the internal compression format.
glGet with argument GL_TEXTURE_COMPRESSED
glGet with argument GL_PIXEL_UNPACK_BUFFER_BINDING
glGetTexLevelParameter with arguments GL_TEXTURE_INTERNAL_FORMAT
and GL_TEXTURE_COMPRESSED_IMAGE_SIZE
glActiveTexture, glCompressedTexImage1D, glCompressedTexImage2D, glCompressedTexSubImage1D, glCompressedTexSubImage2D, glCompressedTexSubImage3D, glCopyTexImage1D, glCopyTexSubImage1D, glCopyTexSubImage2D, glCopyTexSubImage3D, glPixelStore, glTexImage1D, glTexImage2D, glTexSubImage1D, glTexSubImage2D, glTexSubImage3D, glTexParameter
Copyright © 1991-2006 Silicon Graphics, Inc. This document is licensed under the SGI Free Software B License. For details, see http://oss.sgi.com/projects/FreeB/.