glInvalidateTexSubImage â invalidate a region of a texture image
void glInvalidateTexSubImage( | GLuint  | texture, |
|  | GLint  | level, |
|  | GLint  | xoffset, |
|  | GLint  | yoffset, |
|  | GLint  | zoffset, |
|  | GLsizei  | width, |
|  | GLsizei  | height, |
|  | GLsizei  | depth); |
texture+ The name of a texture object a subregion of which to invalidate. +
level+ The level of detail of the texture object within which the region resides. +
xoffset+ The X offset of the region to be invalidated. +
yoffset+ The Y offset of the region to be invalidated. +
zoffset+ The Z offset of the region to be invalidated. +
width+ The width of the region to be invalidated. +
height+ The height of the region to be invalidated. +
depth+ The depth of the region to be invalidated. +
+ glInvalidateTexSubImage invalidates all or part of
+ a texture image. texture and level indicated
+ which texture image is being invalidated. After this command, data in that subregion have undefined
+ values. xoffset, yoffset, zoffset, width, height, and depth
+ are interpreted as they are in glTexSubImage3D. For texture targets that
+ don't have certain dimensions, this command treats those dimensions as
+ having a size of 1. For example, to invalidate a portion of a two-
+ dimensional texture, the application would use zoffset equal to zero and
+ depth equal to one. Cube map textures are treated as an array of six
+ slices in the z-dimension, where a value of zoffset is interpreted as
+ specifying face TEXTURE_CUBE_MAP_POSITIVE_X + zoffset.
+
+ level must be greater than or equal to zero and be
+ less than the base 2 logarithm of the maximum texture width, height, or depth.
+ xoffset, yoffset and zoffset
+ must be greater than or equal to zero and be less than the width, height or depth
+ of the image, respectively. Furthermore, xoffset + width,
+ yoffset + height, and
+ zoffset + depth must be less
+ than or equal to the width, height or depth of the image, respectively.
+
+ For textures of targets GL_TEXTURE_RECTANGLE, GL_TEXTURE_BUFFER, GL_TEXTURE_2D_MULTISAMPLE, or
+ GL_TEXTURE_2D_MULTISAMPLE_ARRAY, level must be zero.
+
+ GL_INVALID_VALUE is generated if xoffset,
+ yoffset or zoffset is less than zero,
+ or if any of them is greater than the size of the image in the corresponding dimension.
+
+ GL_INVALID_VALUE is generated if level is
+ less than zero or if it is greater or equal to the base 2 logarithm of the maximum texture width, height, or depth.
+
+ GL_INVALID_VALUE is generated if the target of texture
+ is any of GL_TEXTURE_RECTANGLE, GL_TEXTURE_BUFFER, GL_TEXTURE_2D_MULTISAMPLE, or
+ GL_TEXTURE_2D_MULTISAMPLE_ARRAY and level is not zero.
+
+ GL_INVALID_VALUE is generated if texture is not the
+ name of an existing texture object.
+
+ glInvalidateTexImage,, + glInvalidateBufferSubData, + glInvalidateBufferData, + glInvalidateFramebuffer, + glInvalidateSubFramebuffer. +
+ Copyright © 2012 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/. +