2013 Khronos Group glInvalidateTexSubImage 3G glInvalidateTexSubImage 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 GL_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. glGet with argument GL_MAX_TEXTURE_SIZE glInvalidateTexImage,, glInvalidateBufferSubData, glInvalidateBufferData, glInvalidateFramebuffer, glInvalidateSubFramebuffer. 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/.