HP b2600 Reference Manual page 78

C
glCopyTexImage2D
Description
glCopyTexImage2D defines a two-dimensional texture image with pixels from the
current GL_READ_BUFFER.
The screen-aligned pixel rectangle with lower left corner at (x, y) and with a width of
width + 2
mipmap level specified by level. internalFormat specifies the internal format of the
texture array.
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 format for
storage in the texel array.
Pixel ordering is such that lower x and y screen coordinates correspond to lower s and t
texture coordinates.
If any of the pixels within the specified rectangle of the current GL_READ_BUFFER are
outside the window associated with the current rendering context, then the values
obtained for those pixels are undefined.
Notes
glCopyTexImage2D is available only if the GL version is 1.1 or greater.
Texturing has no effect in color index mode.
1, 2, 3, and 4 are not accepted values for internalFormat.
The GL_DEPTH_COMPONENT, GL_DEPTH_COMPONENT16_EXT,
GL_DEPTH_COMPONENT24_EXT, and GL_DEPTH_COMPONENT32_EXT values of
internalFormat may be used.
An image with height or width of 0 indicates a NULL texture.
Errors
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border and a height of height + 2
GL_INVALID_ENUM is generated if target is not GL_TEXTURE_2D.
GL_INVALID_VALUE is generated if level is less than 0.
GL_INVALID_VALUE may be generated if level is greater than log
is the returned value of GL_MAX_TEXTURE_SIZE.
GL_INVALID_VALUE is generated if width or height is less than 0, greater than 2 +
GL_MAX_TEXTURE_SIZE, or if width or height cannot be represented as 2
border for some integer k.
GL_INVALID_VALUE is generated if border is not 0 or 1.
GL_INVALID_VALUE is generated if internalFormat is not one of the allowable
values.
GL_INVALID_OPERATION is generated if glCopyTexImage2D is executed between
the execution of glBegin and the corresponding execution of glEnd.
border defines the texture array at the
max, where max
2
k
+ 2
Chapter 3