glCopyTexSubImage1D, glCopyTextureSubImage1D — copy a one-dimensional texture subimage
void glCopyTexSubImage1D(
|
GLenum target, |
| GLint level, | |
| GLint xoffset, | |
| GLint x, | |
| GLint y, | |
GLsizei width); |
void glCopyTextureSubImage1D(
|
GLuint texture, |
| GLint level, | |
| GLint xoffset, | |
| GLint x, | |
| GLint y, | |
GLsizei width); |
target
Specifies the target to which the texture object is bound for
glCopyTexSubImage1D function. Must be
GL_TEXTURE_1D.
texture
Specifies the texture object name for
glCopyTextureSubImage1D function.
level
Specifies the level-of-detail number. Level 0 is the base image level. Level n is the nth mipmap reduction image.
xoffset
Specifies the texel offset within the texture array.
x,
y
Specify the window coordinates of the left corner of the row of pixels to be copied.
width
Specifies the width of the texture subimage.
glCopyTexSubImage1D and
glCopyTextureSubImage1D replace a portion of a
one-dimensional texture image with pixels from the current
GL_READ_BUFFER (rather than from main memory, as is
the case for
glTexSubImage1D).
For glCopyTexSubImage1D, the
texture object that is bound to target will be used
for the process. For glCopyTextureSubImage1D,
texture tells which texture object should be used
for the purpose of the call.
The screen-aligned pixel row with left corner at
(x,\ y), and with length
width replaces the portion of the texture array
with x indices xoffset through
The pixels in the row are processed exactly as if
glReadPixels
had been called, but the process stops just before final
conversion. At this point, all pixel component values are clamped to the
range
It is not an error to specify a subtexture with zero width, but such
a specification has no effect. If any of the pixels within the specified
row 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 or width parameters of the specified texture array or to texel values outside the specified subregion.
The glPixelStore mode affects texture images.
GL_INVALID_ENUM is generated by
glCopyTexSubImage1D if target
is not GL_TEXTURE_1D.
GL_INVALID_FRAMEBUFFER_OPERATION is generated
if the object bound to GL_READ_FRAMEBUFFER_BINDING is
not framebuffer complete.
GL_INVALID_OPERATION is generated by
glCopyTextureSubImage1D if
texture is not the name of an existing texture
object, or if the effective target of texture is
not GL_TEXTURE_1D.
GL_INVALID_OPERATION is generated if the
texture array has not been defined by a previous
glTexImage1D,
glCopyTexImage1D,
or
glTexStorage1D
operation.
GL_INVALID_VALUE is generated if
level is less than 0.
GL_INVALID_VALUE may be generated if
GL_MAX_TEXTURE_SIZE.
GL_INVALID_VALUE is generated if
GL_TEXTURE_WIDTH of the
texture image being modified.
GL_INVALID_OPERATION is generated if:
the read buffer is GL_NONE, or
the value of GL_READ_FRAMEBUFFER_BINDING
is non-zero, and:
the read buffer selects an attachment that has no image attached, or
the effective value of
GL_SAMPLE_BUFFERS for the read
framebuffer is one.
| OpenGL Version | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Function / Feature Name | 2.0 | 2.1 | 3.0 | 3.1 | 3.2 | 3.3 | 4.0 | 4.1 | 4.2 | 4.3 | 4.4 | 4.5 |
glCopyTexSubImage1D
|
✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ |
glCopyTextureSubImage1D
|
- | - | - | - | - | - | - | - | - | - | - | ✔ |
glCopyTexImage1D, glCopyTexImage2D, glCopyTexSubImage2D, glCopyTexSubImage3D, glPixelStore, glReadBuffer, glTexImage1D, glTexImage2D, glTexImage3D, glTexParameter, glTexSubImage1D, glTexSubImage2D, glTexSubImage3D
Copyright © 1991-2006 Silicon Graphics, Inc. Copyright © 2012-2014 Khronos Group. This document is licensed under the SGI Free Software B License. For details, see http://oss.sgi.com/projects/FreeB/.