1GLCOPYTEXSUBIMAGE1D(3G)          OpenGL Manual         GLCOPYTEXSUBIMAGE1D(3G)
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NAME

6       glCopyTexSubImage1D - copy a one-dimensional texture subimage
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C SPECIFICATION

9       void glCopyTexSubImage1D(GLenum target, GLint level, GLint xoffset,
10                                GLint x, GLint y, GLsizei width);
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PARAMETERS

13       target
14           Specifies the target texture. Must be GL_TEXTURE_1D.
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16       level
17           Specifies the level-of-detail number. Level 0 is the base image
18           level. Level n is the nth mipmap reduction image.
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20       xoffset
21           Specifies the texel offset within the texture array.
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23       x, y
24           Specify the window coordinates of the left corner of the row of
25           pixels to be copied.
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27       width
28           Specifies the width of the texture subimage.
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DESCRIPTION

31       glCopyTexSubImage1D replaces a portion of a one-dimensional texture
32       image with pixels from the current GL_READ_BUFFER (rather than from
33       main memory, as is the case for glTexSubImage1D()).
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35       The screen-aligned pixel row with left corner at (x,\ y), and with
36       length width replaces the portion of the texture array with x indices
37       xoffset through xoffset + width - 1, inclusive. The destination in the
38       texture array may not include any texels outside the texture array as
39       it was originally specified.
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41       The pixels in the row are processed exactly as if glReadPixels() had
42       been called, but the process stops just before final conversion. At
43       this point, all pixel component values are clamped to the range 0 1 and
44       then converted to the texture's internal format for storage in the
45       texel array.
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47       It is not an error to specify a subtexture with zero width, but such a
48       specification has no effect. If any of the pixels within the specified
49       row of the current GL_READ_BUFFER are outside the read window
50       associated with the current rendering context, then the values obtained
51       for those pixels are undefined.
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53       No change is made to the internalformat, width, or border parameters of
54       the specified texture array or to texel values outside the specified
55       subregion.
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NOTES

58       The glPixelStore() mode affects texture images.
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ERRORS

61       GL_INVALID_ENUM is generated if /target is not GL_TEXTURE_1D.
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63       GL_INVALID_OPERATION is generated if the texture array has not been
64       defined by a previous glTexImage1D() or glCopyTexImage1D() operation.
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66       GL_INVALID_VALUE is generated if level is less than 0.
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68       GL_INVALID_VALUE may be generated if level > log 2 ⁡ max, where max is
69       the returned value of GL_MAX_TEXTURE_SIZE.
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71       GL_INVALID_VALUE is generated if xoffset < - b, or xoffset + width > w
72       - b, where w is the GL_TEXTURE_WIDTH and b is the GL_TEXTURE_BORDER of
73       the texture image being modified. Note that w includes twice the border
74       width.
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ASSOCIATED GETS

77       glGetTexImage()
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SEE ALSO

80       glCopyTexImage1D(), glCopyTexImage2D(), glCopyTexSubImage2D(),
81       glCopyTexSubImage3D(), glPixelStore(), glReadBuffer(), glTexImage1D(),
82       glTexImage2D(), glTexImage3D(), glTexParameter(), glTexSubImage1D(),
83       glTexSubImage2D(), glTexSubImage3D()
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86       Copyright © 1991-2006 Silicon Graphics, Inc. This document is licensed
87       under the SGI Free Software B License. For details, see
88       http://oss.sgi.com/projects/FreeB/.
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AUTHORS

91       opengl.org
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95opengl.org                        06/10/2014           GLCOPYTEXSUBIMAGE1D(3G)
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