glCopyTexSubImage3D — copy a three-dimensional texture subimage
void glCopyTexSubImage3D( | GLenum target, |
| GLint level, | |
| GLint xoffset, | |
| GLint yoffset, | |
| GLint zoffset, | |
| GLint x, | |
| GLint y, | |
| GLsizei width, | |
GLsizei height); |
target Specifies the target texture. Must be GL_TEXTURE_3D or GL_TEXTURE_2D_ARRAY.
level Specifies the level-of-detail number. Level 0 is the base image level. Level n is the nth mipmap reduction image.
xoffset Specifies a texel offset in the x direction within the texture array.
yoffset Specifies a texel offset in the y direction within the texture array.
zoffset Specifies a texel offset in the z direction within the texture array.
x, y Specify the window coordinates of the lower left corner of the rectangular region of pixels to be copied.
width Specifies the width of the texture subimage.
height Specifies the height of the texture subimage.
glCopyTexSubImage3D replaces a rectangular portion of a three-dimensional or two-dimensional array texture image with pixels from the current GL_READ_BUFFER (rather than from main memory, as is the case for glTexSubImage3D).
The screen-aligned pixel rectangle with lower left corner at (x, y) and with width width and height height replaces the portion of the texture array with x indices xoffset through , inclusive, and y indices yoffset through , inclusive, at z index zoffset and at the mipmap level specified by level.
The pixels in the rectangle are processed exactly as if glReadPixels had been called, but the process stops after conversion to RGBA values.
The destination rectangle in the texture array may not include any texels outside 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 any of the pixels within the specified rectangle of the current GL_READ_BUFFER are outside the read window associated with the current rendering context, then the values obtained for those pixels are undefined.
No change is made to the internalformat, width, height, depth, or border parameters of the specified texture array or to texel values outside the specified subregion.
glPixelStorei modes affect texture images.
GL_INVALID_ENUM is generated if target is not GL_TEXTURE_3D or GL_TEXTURE_2D_ARRAY.
GL_INVALID_OPERATION is generated if the texture array has not been defined by a previous glTexImage3D or glTexStorage3D operation.
GL_INVALID_VALUE is generated if level is less than 0.
GL_INVALID_VALUE may be generated if , where is the returned value of GL_MAX_3D_TEXTURE_SIZE.
GL_INVALID_VALUE is generated if , , or , where is the GL_TEXTURE_WIDTH, is the GL_TEXTURE_HEIGHT, is the GL_TEXTURE_DEPTH of the texture image being modified.
| OpenGL ES API Version | |||
|---|---|---|---|
| Function Name | 2.0 | 3.0 | 3.1 |
| glCopyTexSubImage3D | - | ✔ | ✔ |
glCopyTexImage2D, glCopyTexSubImage2D, glPixelStorei, glReadBuffer, glTexImage2D, glTexImage3D, glTexParameter, glTexSubImage2D, glTexSubImage3D
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 https://web.archive.org/web/20171022161616/http://oss.sgi.com/projects/FreeB/.