C
glCopyTexImage1D
Chapter 3
75
The screen-aligned pixel row with left corner at (x, y) and with a length of width+2 ×
border defines the texture array at the mipmap level specified by level. internalFormat
specifies the internal format of the texture array.
The pixels in the row 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 screen coordinates correspond to lower texture
coordinates.
If any of the pixels within the specified row 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
glCopyTexImage1D 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 0 width indicates a NULL texture.
Errors
• GL_INVALID_ENUM is generated if target is not one of the allowable values.
• GL_INVALID_VALUE is generated if level is less than 0.
• GL_INVALID_VALUE may be generated if levelis greater than log
2
max, where max
is the returned value of GL_MAX_TEXTURE_SIZE.
• GL_INVALID_VALUE is generated if internalFormat is not an allowable value.
• GL_INVALID_VALUE is generated if width is less than 0 or greater than 2 +
GL_MAX_TEXTURE_SIZE, or if it cannot be represented as 2
n
+2 ×border for some
integer value of n.
• GL_INVALID_VALUE is generated if border is not 0 or 1.
• GL_INVALID_OPERATION is generated if glCopyTexImage1D is executed between
the execution of glBegin and the corresponding execution of glEnd.
Associated Gets
glGetTexImage
glIsEnabled with argument GL_TEXTURE_1D
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