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
yoffset through
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
GL_MAX_3D_TEXTURE_SIZE.
GL_INVALID_VALUE is generated if
GL_TEXTURE_WIDTH,
GL_TEXTURE_HEIGHT,
GL_TEXTURE_DEPTH
of the texture image being modified.
| OpenGL ES API Version | ||
|---|---|---|
| Function Name | 2.0 | 3.0 |
| glCopyTexSubImage3D | - | ✔ |
glCopyTexImage2D, glCopyTexSubImage2D, glPixelStorei, glReadBuffer, glTexImage2D, glTexImage3D, glTexParameter, glTexSubImage2D, glTexSubImage3D
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