glTexSubImage3D

Texturing maps a portion of a specified texture image onto each graphical primitive for which texturing is enabled.

glTexSubImage3D redefines a contiguous subregion of an existing three-dimensional or two-dimensioanl array texture image. The texels referenced by data replace the portion of the existing texture array with x indices xoffset and $\mathit{xoffset}+\mathit{width}-1$ , inclusive, y indices yoffset and $\mathit{yoffset}+\mathit{height}-1$ , inclusive, and z indices zoffset and $\mathit{zoffset}+\mathit{depth}-1$ , inclusive. For three-dimensional textures, the z index refers to the third dimension. For two-dimensional array textures, the z index refers to the slice index. 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 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.

The glPixelStore modes affect texture images.

glTexSubImage3D specifies a three-dimensional or two-dimenaional array subtexture for the current texture unit, specified with glActiveTexture .

GL_INVALID_ENUM is generated if / target is not GL_TEXTURE_3D or GL_TEXTURE_2D_ARRAY .

GL_INVALID_ENUM is generated if format is not an accepted format constant.

GL_INVALID_ENUM is generated if type is not a type constant.

GL_INVALID_VALUE is generated if level is less than 0.

GL_INVALID_VALUE may be generated if level is greater than ${\mathit{log}}_2$ max , where max is the returned value of GL_MAX_TEXTURE_SIZE .

GL_INVALID_VALUE is generated if $\mathit{xoffset}<-\mathit{b}$ , $\left(\mathit{xoffset}+\mathit{width}\right)>\left(\mathit{w}-\mathit{b}\right)$ , $\mathit{yoffset}<-\mathit{b}$ , or $\left(\mathit{yoffset}+\mathit{height}\right)>\left(\mathit{h}-\mathit{b}\right)$ , or $\mathit{zoffset}<-\mathit{b}$ , or $\left(\mathit{zoffset}+\mathit{depth}\right)>\left(\mathit{d}-\mathit{b}\right)$ , where $\mathit{w}$ is the GL_TEXTURE_WIDTH , $\mathit{h}$ is the GL_TEXTURE_HEIGHT , $\mathit{d}$ is the GL_TEXTURE_DEPTH and $\mathit{b}$ is the border width of the texture image being modified. Note that $\mathit{w}$ , $\mathit{h}$ , and $\mathit{d}$ include twice the border width.

GL_INVALID_VALUE is generated if width , height , or depth is less than 0.

GL_INVALID_OPERATION is generated if the texture array has not been defined by a previous glTexImage3D or glTexStorage3D operation.

GL_INVALID_OPERATION is generated if type is one of GL_UNSIGNED_BYTE_3_3_2 , GL_UNSIGNED_BYTE_2_3_3_REV , GL_UNSIGNED_SHORT_5_6_5 , or GL_UNSIGNED_SHORT_5_6_5_REV and format is not GL_RGB .

GL_INVALID_OPERATION is generated if type is one of GL_UNSIGNED_SHORT_4_4_4_4 , GL_UNSIGNED_SHORT_4_4_4_4_REV , GL_UNSIGNED_SHORT_5_5_5_1 , GL_UNSIGNED_SHORT_1_5_5_5_REV , GL_UNSIGNED_INT_8_8_8_8 , GL_UNSIGNED_INT_8_8_8_8_REV , GL_UNSIGNED_INT_10_10_10_2 , or GL_UNSIGNED_INT_2_10_10_10_REV and format is neither GL_RGBA nor GL_BGRA .

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.

GL_INVALID_OPERATION is generated if a non-zero buffer object name is bound to the GL_PIXEL_UNPACK_BUFFER target and data is not evenly divisible into the number of bytes needed to store in memory a datum indicated by type .

glGetTexImage

glGet with argument GL_PIXEL_UNPACK_BUFFER_BINDING

glActiveTexture , glCopyTexImage1D , glCopyTexImage2D , glCopyTexSubImage1D , glCopyTexSubImage2D , glCopyTexSubImage3D , glPixelStore , glTexImage1D , glTexImage2D , glTexImage3D , glTexSubImage1D , glTexSubImage2D , 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/ .