Provided by: opengl-4-man-doc_1.0~svn22917-1_all 
NAME
glClearTexSubImage - fills all or part of a texture image with a constant value
C SPECIFICATION
void glClearTexSubImage(GLuint texture, GLint level, GLint xoffset, GLint yoffset,
GLint zoffset, GLsizei width, GLsizei height, GLsizei depth,
GLenum format, GLenum type, const void * data);
PARAMETERS
texture
The name of an existing texture object containing the image to be cleared.
level
The level of texture containing the region to be cleared.
xoffset
The coordinate of the left edge of the region to be cleared.
yoffset
The coordinate of the lower edge of the region to be cleared.
zoffset
The coordinate of the front of the region to be cleared.
width
The width of the region to be cleared.
height
The height of the region to be cleared.
depth
The depth of the region to be cleared.
format
The format of the data whose address in memory is given by data.
type
The type of the data whose address in memory is given by data.
data
The address in memory of the data to be used to clear the specified region.
DESCRIPTION
glClearTexSubImage fills all or part of an image contained in a texture with an
application supplied value. texture must be the name of an existing texture. Further,
texture may not be the name of a buffer texture, nor may its internal format be
compressed.
Arguments xoffset, yoffset, and zoffset specify the lower left texel coordinates of a
width-wide by height-high by depth-deep rectangular subregion of the texel array.
For one-dimensional array textures, yoffset is interpreted as the first layer to be
cleared and height is the number of layers to clear. For two-dimensional array textures,
zoffset is interpreted as the first layer to be cleared and depth is the number of layers
to clear. Cube map textures are treated as an array of six slices in the z-dimension,
where the value of zoffset is interpreted as specifying the cube map face for the
corresponding layer and depth is the number of faces to clear. For cube map array
textures, zoffset is the first layer-face to clear, and depth is the number of layer-faces
to clear. Each layer-face is translated into an array layer and a cube map face as
described in the OpenGL Specification.
Negative values of xoffset, yoffset, and zoffset correspond to the coordinates of border
texels. Taking ws, hs, ds, wb, hb, and db to be the specified width, height, depth, and
the border width, border height, and border depth of the texel array and taking x, y, z,
w, h, and d to be the xoffset, yoffset, zoffset, width, height, and depth argument values,
any of the following relationships generates a GL_INVALID_OPERATION error:
•
x
<
w
b
.RE
•
x
+
w
>
w
s
-
w
b
.RE
•
y
<
-
h
b
.RE
•
y
+
h
>
h
s
-
h
b
.RE
•
z
<
-
d
b
.RE
•
z
+
d
>
d
s
-
d
b
.RE
For texture types that do not have certain dimensions, this
command treats those dimensions as having a size of 1. For
example, to clear a portion of a two-dimensional texture, use
zoffset equal to zero and depth equal to one.
format and type specify the format and type of the source data and
are interpreted as they are for glTexImage3D(). Textures with a
base internal format of GL_DEPTH_COMPONENT, GL_STENCIL_INDEX, or
GL_DEPTH_STENCIL require depth component, stencil, or
depth-stencil component data respectively. Textures with other
base internal formats require RGBA formats. Textures with integer
internal formats require integer data.
data is a pointer to an array of between one and four components
of texel data that will be used as the source for the constant
fill value. The elements of data are converted by the GL into the
internal format of the texture image (that was specified when the
level was defined by any of the glTexImage*, glTexStorage* or
glCopyTexImage* commands), and then used to fill the specified
range of the destination texture level. If data is NULL, then the
pointer is ignored and the sub-range of the texture image is
filled with zeros. If texture is a multisample texture, all the
samples in a texel are cleared to the value specified by data.
NOTES
glClearTexSubImage is available only if the GL version is 4.4 or greater.
ERRORS
GL_INVALID_OPERATION is generated if texture is zero or not the name of an existing
texture object.
GL_INVALID_OPERATION is generated if texture is a buffer texture.
GL_INVALID_OPERATION is generated if texture has a compressed internal format.
GL_INVALID_OPERATION is generated if the base internal format is GL_DEPTH_COMPONENT and
format is not GL_DEPTH_COMPONENT.
GL_INVALID_OPERATION is generated if the base internal format is GL_DEPTH_STENCIL and
format is not GL_DEPTH_STENCIL.
GL_INVALID_OPERATION is generated if the base internal format is GL_STENCIL_INDEX and
format is not GL_STENCIL_INDEX.
GL_INVALID_OPERATION is generated if the base internal format is GL_RGBA and format is
GL_DEPTH_COMPONENT, GL_STENCIL_INDEX, or GL_DEPTH_STENCIL.
GL_INVALID_OPERATION is generated if the internal format is integer and format does not
specify integer data.
GL_INVALID_OPERATION is generated if the internal format is not integer and format
specifies integer data.
GL_INVALID_OPERATION error is generated if the xoffset, yoffset, zoffset, width, height,
and depth parameters (or combinations thereof) specify a region that falls outside the
defined texture image array (including border, if any).
ASSOCIATED GETS
glGetTexImage(), glGetInternalformat()
SEE ALSO
glClearTexImage(), glTexStorage1D(), glTexStorage2D(), glTexStorage3D(), glTexImage1D(),
glTexImage2D(), glTexImage3D()
COPYRIGHT
Copyright © 2013 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