glTexSubImage2D

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

glTexSubImage2D and glTextureSubImage2D redefine a contiguous subregion of an existing two-dimensional or one-dimensional array texture image. The texels referenced by pixels replace the portion of the existing texture array with x indices xoffset and $\mathit{xoffset}+\mathit{width}-1$ , inclusive, and y indices yoffset and $\mathit{yoffset}+\mathit{height}-1$ , 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 or height, 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, pixels is treated as a byte offset into the buffer object's data store.

glPixelStore modes affect texture images.

glTexSubImage2D and glTextureSubImage3D specify a two-dimensional subtexture for the current texture unit, specified with glActiveTexture .

GL_STENCIL_INDEX is accepted for format only if the GL version is 4.4 or higher.

GL_INVALID_ENUM is generated if target or the effective target of texture is not GL_TEXTURE_2D , GL_TEXTURE_CUBE_MAP_POSITIVE_X , GL_TEXTURE_CUBE_MAP_NEGATIVE_X , GL_TEXTURE_CUBE_MAP_POSITIVE_Y , GL_TEXTURE_CUBE_MAP_NEGATIVE_Y , GL_TEXTURE_CUBE_MAP_POSITIVE_Z , GL_TEXTURE_CUBE_MAP_NEGATIVE_Z , or GL_TEXTURE_1D_ARRAY .

GL_INVALID_OPERATION is generated by glTextureSubImage2D if texture is not the name of an existing texture object.

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 $\left(\mathit{yoffset}+\mathit{height}\right)>\left(\mathit{h}-\mathit{b}\right)$ , where $\mathit{w}$ is the GL_TEXTURE_WIDTH , $\mathit{h}$ is the GL_TEXTURE_HEIGHT , and $\mathit{b}$ is the border width of the texture image being modified. Note that $\mathit{w}$ and $\mathit{h}$ include twice the border width.

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

GL_INVALID_OPERATION is generated if the texture array has not been defined by a previous glTexImage2D 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 format is GL_STENCIL_INDEX and the base internal format is not GL_STENCIL_INDEX .

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 pixels 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 , glTexSubImage3D , glTexParameter

Copyright 1991-2006 Silicon Graphics, Inc. Copyright 2010-2014 Khronos Group. This document is licensed under the SGI Free Software B License. For details, see .