void glCopyTexSubImage3D | ( | GLenum target, GLint level, GLint xoffset, GLint yoffset, GLint zoffset, GLint x, GLint y, GLsizei width, GLsizei height); |
glCopyTexSubImage3D | ( | target, level, xoffset, yoffset, zoffset, x, y, width, height) → None |
glCopyTexSubImage3D replaces a rectangular portion of a three-dimensional 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 xoffset
The pixels in the rectangle are processed exactly as if glCopyPixels had been called, but the process stops just before final conversion. At this point, all pixel component values are clamped to the range [0,1] and then converted to the texture's internal for storage in the texel array.
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.
glCopyTexSubImage3D is available only if the GL version is 1.2 or greater.
Texturing has no effect in color index mode.
glPixelStore and glPixelTransfer modes affect texture images in exactly the way they affect glDrawPixels.
When the GL_ARB_imaging extension is supported, the RGBA components copied from the framebuffer may be processed by the imaging pipeline, as if they were a two-dimensional texture. See glTexImage2D for specific details.
GL_INVALID_ENUM is generated if target is not GL_TEXTURE_3D.
GL_INVALID_OPERATION is generated if the texture array has not been defined by a previous glTexImage3D or glCopyTexImage3D operation.
GL_INVALID_VALUE is generated if level is less than 0.
GL_INVALID_VALUE may be generated if level is greater than
GL_INVALID_VALUE is generated if x
GL_INVALID_VALUE is generated if
GL_INVALID_OPERATION is generated if glCopyTexSubImage3D is executed between the execution of glBegin and the corresponding execution of glEnd.