gltexsubimage3dext - Man Page
glTexSubImage3DEXT(3G) OpenGL Reference glTexSubImage3DEXT(3G)
NAME
glTexSubImage3DEXT - specify a three-dimensional texture subimage
C SPECIFICATION
void glTexSubImage3DEXT( GLenum target,
GLint level,
GLint xoffset,
GLint yoffset,
GLint zoffset,
GLsizei width,
GLsizei height,
GLsizei depth,
GLenum format,
GLenum type,
const GLvoid *pixels )
PARAMETERS
target Specifies the target texture. Must be GL_TEXTURE_3D_EXT.
level Specifies the level-of-detail number. Level 0 is the base image
level. Level n is the nth mipmap reduction image.
xoffset Specifies a texel offset in the x direction within the texture
array.
yoffset Specifies a texel offset in the y direction within the texture
array.
zoffset Specifies a texel offset in the z direction within the texture
array.
width Specifies the width of the texture subimage.
height Specifies the height of the texture subimage.
depth Specifies the depth of the texture subimage.
format Specifies the format of the pixel data. The following symbolic
values are accepted: GL_COLOR_INDEX, GL_RED, GL_GREEN, GL_BLUE,
GL_ALPHA, GL_RGB, GL_RGBA, GL_ABGR_EXT, GL_LUMINANCE, and
GL_LUMINANCE_ALPHA.
type Specifies the data type of the pixel data. The following
symbolic values are accepted: GL_UNSIGNED_BYTE, GL_BYTE,
GL_BITMAP, GL_UNSIGNED_SHORT, GL_SHORT, GL_UNSIGNED_INT, GL_INT,
GL_FLOAT, GL_UNSIGNED_BYTE_3_3_2_EXT,
GL_UNSIGNED_SHORT_4_4_4_4_EXT, GL_UNSIGNED_SHORT_5_5_5_1_EXT,
GL_UNSIGNED_INT_8_8_8_8_EXT, and GL_UNSIGNED_INT_10_10_10_2_EXT.
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glTexSubImage3DEXT(3G) OpenGL Reference glTexSubImage3DEXT(3G)
pixels Specifies a pointer to the image data in memory.
DESCRIPTION
Texturing maps a portion of a specified texture image onto each graphical
primitive for which texturing is enabled. Three-dimensional texturing is
enabled and disabled using glEnable and glDisable with argument
GL_TEXTURE_3D_EXT.
glTexSubImage3DEXT redefines a contiguous subregion of an existing
three-dimensional texture image. The texels referenced by pixels replace
the portion of the existing texture array with x indices xoffset and
xoffset+width-1, inclusive, y indices yoffset and yoffset+height-1,
inclusive (But, see discussion of GL_INTERLACE_SGIX below), and z indices
zoffset and zoffset+depth-1, inclusive. This region may not include any
texels outside the range of the texture array as it was originally
specified. It is not an error to specify a subtexture with zero width,
height or depth, but such a specification has no effect.
If GL_INTERLACE_SGIX is enabled, then every other row of the destination
texture is skipped. That is, only rows (0,2,4,...) of each S-T slice
(where the border is considered part of the slice) are defined. A
complete video frame may be assembled in a slice of the texture array by
invoking glTexSubImage3DEXT on two consecutive video fields, with yoffset
values that differ by one.
NOTES
Texturing has no effect in color index mode.
glPixelStore and glPixelTransfer modes affect texture images in exactly
the way they affect glDrawPixels.
glTexSubImage3DEXT is only available if both the EXT_subtexture and
EXT_texture3d extensions are supported.
If type is set to GL_UNSIGNED_BYTE_3_3_2_EXT,
GL_UNSIGNED_SHORT_4_4_4_4_EXT, GL_UNSIGNED_SHORT_5_5_5_1_EXT,
GL_UNSIGNED_INT_8_8_8_8_EXT, or GL_UNSIGNED_INT_10_10_10_2_EXT and the
EXT_packed_pixels extension is not supported then a GL_INVALID_ENUM error
is generated.
See glIntro for more information on using extensions.
ERRORS
GL_INVALID_ENUM is generated when target is not GL_TEXTURE_3D_EXT.
GL_INVALID_OPERATION is generated when the texture array has not been
defined by a previous glTexImage3D operation.
GL_INVALID_VALUE is generated if level is less than zero or greater than
log2(max), where max is the returned value of GL_MAX_3D_TEXTURE_SIZE_EXT.
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glTexSubImage3DEXT(3G) OpenGL Reference glTexSubImage3DEXT(3G)
GL_INVALID_VALUE is generated if xoffset<-TEXTURE_BORDER,
(xoffset+width)>(TEXTURE_WIDTH-TEXTURE_BORDER), yoffset<-TEXTURE_BORDER,
(yoffset+interlacexheight)>(TEXTURE_HEIGHT-TEXTURE_BORDER),
zoffset<-TEXTURE_BORDER, or (zoffset+depth)>(TEXTURE_DEPTH_EXT-
TEXTURE_BORDER), where TEXTURE_WIDTH, TEXTURE_HEIGHT, TEXTURE_DEPTH_EXT
and TEXTURE_BORDER are the state values of the texture image being
modified, and interlace is 1 if GL_INTERLACE_SGIX is disabled and 2
otherwise. Note that TEXTURE_WIDTH, TEXTURE_HEIGHT and TEXTURE_DEPTH_EXT
include twice the border width.
GL_INVALID_ENUM is generated when format is not an accepted format
constant.
GL_INVALID_ENUM is generated when type is not a type constant.
GL_INVALID_ENUM is generated if type is GL_BITMAP and format is not
GL_COLOR_INDEX.
GL_INVALID_OPERATION is generated if glTexSubImage3DEXT is executed
between the execution of glBegin and the corresponding execution of
glEnd.
ASSOCIATED GETS
glGetTexImage
glIsEnabled with argument GL_TEXTURE_3D_EXT
MACHINE DEPENDENCIES
On InfiniteReality systems, the width of the image to be transferred to
texture memory must be a multiple of 8. This constraint will be lifted
in a future release, though transfers that are a multiple of 8 in length
will have somewhat higher performance than other transfers.
Texture borders are not supported on InfiniteReality systems. They will
be supported in a future release, however, they will require large
amounts of texture memory. Whenever possible, applications should use
borderless textures and GL_CLAMP_TO_EDGE_SGIS wrap mode.
The SGIX_interlace extension is supported only on InfiniteReality systems
and on RealityEngine, RealityEngine2, and VTX systems.
The EXT_packed_pixels extension is not supported on RealityEngine,
RealityEngine2, and VTX systems; it will be supported on High Impact and
Maximum Impact systems in a future release.
glTexSubImage3DEXT is not supported on RealityEngine, RealityEngine2, and
VTX systems.
On High Impact and Maximum Impact systems, if the right side of the image
to be transferred to texture memory is not the right side of the texture,
then its index must be a multiple of 32, where index = xoffset+width.
Otherwise it will generate a GL_INVALID_VALUE error.
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glTexSubImage3DEXT(3G) OpenGL Reference glTexSubImage3DEXT(3G)
SEE ALSO
glDrawPixels, glFog, glPixelStore, glPixelTransfer, glTexEnv, glTexGen,
glTexImage3D, glTexParameter.
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