1GLCOPYTEXSUBIMAGE3D(3G)          OpenGL Manual         GLCOPYTEXSUBIMAGE3D(3G)
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NAME

6       glCopyTexSubImage3D - copy a three-dimensional texture subimage
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C SPECIFICATION

9       void glCopyTexSubImage3D(GLenum target, GLint level, GLint xoffset,
10                                GLint yoffset, GLint zoffset, GLint x,
11                                GLint y, GLsizei width, GLsizei height);
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PARAMETERS

14       target
15           Specifies the target texture. Must be GL_TEXTURE_3D or
16           GL_TEXTURE_2D_ARRAY.
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18       level
19           Specifies the level-of-detail number. Level 0 is the base image
20           level. Level n is the nth mipmap reduction image.
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22       xoffset
23           Specifies a texel offset in the x direction within the texture
24           array.
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26       yoffset
27           Specifies a texel offset in the y direction within the texture
28           array.
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30       zoffset
31           Specifies a texel offset in the z direction within the texture
32           array.
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34       x, y
35           Specify the window coordinates of the lower left corner of the
36           rectangular region of pixels to be copied.
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38       width
39           Specifies the width of the texture subimage.
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41       height
42           Specifies the height of the texture subimage.
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DESCRIPTION

45       glCopyTexSubImage3D replaces a rectangular portion of a
46       three-dimensional or two-dimensional array texture image with pixels
47       from the current GL_READ_BUFFER (rather than from main memory, as is
48       the case for glTexSubImage3D()).
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50       The screen-aligned pixel rectangle with lower left corner at (x, y) and
51       with width width and height height replaces the portion of the texture
52       array with x indices xoffset through xoffset + width - 1, inclusive,
53       and y indices yoffset through yoffset + height - 1, inclusive, at z
54       index zoffset and at the mipmap level specified by level.
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56       The pixels in the rectangle are processed exactly as if glReadPixels()
57       had been called, but the process stops just before final conversion. At
58       this point, all pixel component values are clamped to the range 0 1 and
59       then converted to the texture's internal format for storage in the
60       texel array.
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62       The destination rectangle in the texture array may not include any
63       texels outside the texture array as it was originally specified. It is
64       not an error to specify a subtexture with zero width or height, but
65       such a specification has no effect.
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67       If any of the pixels within the specified rectangle of the current
68       GL_READ_BUFFER are outside the read window associated with the current
69       rendering context, then the values obtained for those pixels are
70       undefined.
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72       No change is made to the internalformat, width, height, depth, or
73       border parameters of the specified texture array or to texel values
74       outside the specified subregion.
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NOTES

77       glPixelStore() modes affect texture images.
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ERRORS

80       GL_INVALID_ENUM is generated if /target is not GL_TEXTURE_3D.
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82       GL_INVALID_OPERATION is generated if the texture array has not been
83       defined by a previous glTexImage3D() operation.
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85       GL_INVALID_VALUE is generated if level is less than 0.
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87       GL_INVALID_VALUE may be generated if level > log 2 ⁡ max, where max is
88       the returned value of GL_MAX_3D_TEXTURE_SIZE if target is GL_TEXTURE_3D
89       or the returned value of GL_MAX_ARRAY_TEXTURE_LAYERS if target is
90       GL_TEXTURE_2D_ARRAY.
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92       GL_INVALID_VALUE is generated if xoffset < - b, xoffset + width > w -
93       b, yoffset < - b, yoffset + height > h - b, zoffset < - b, or zoffset +
94       1 > d - b, where w is the GL_TEXTURE_WIDTH, h is the GL_TEXTURE_HEIGHT,
95       d is the GL_TEXTURE_DEPTH, and b is the GL_TEXTURE_BORDER of the
96       texture image being modified. Note that w, h, and d include twice the
97       border width.
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ASSOCIATED GETS

100       glGetTexImage()
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SEE ALSO

103       glCopyTexImage1D(), glCopyTexImage2D(), glCopyTexSubImage1D(),
104       glCopyTexSubImage2D(), glPixelStore(), glReadBuffer(), glTexImage1D(),
105       glTexImage2D(), glTexImage3D(), glTexParameter(), glTexSubImage1D(),
106       glTexSubImage2D(), glTexSubImage3D()
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109       Copyright © 1991-2006 Silicon Graphics, Inc. This document is licensed
110       under the SGI Free Software B License. For details, see
111       http://oss.sgi.com/projects/FreeB/.
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AUTHORS

114       opengl.org
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118opengl.org                        06/10/2014           GLCOPYTEXSUBIMAGE3D(3G)
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