GLCOPYTEXIMAGE1D() MachTen Programmer’s Manual GLCOPYTEXIMAGE1D()

NAME
glCopyTexImage1D - copy pixels into a 1D texture image

C SPECIFICATION
void glCopyTexImage1D( GLenum target,
GLint level,
GLenum internalFormat,
GLint x,
GLint y,
GLsizei width,
GLint border )

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PARAMETERS
target Specifies the target texture. Must be
GL_TEXTURE_1D.

level Specifies the level-of-detail number.
Level 0 is the base image level. Level n
is the nth mipmap reduction image.

internalFormat Specifies the internal format of the tex-
ture. Must be one of the following sym-
bolic constants: GL_ALPHA, GL_ALPHA4,
GL_ALPHA8, GL_ALPHA12, GL_ALPHA16,
GL_LUMINANCE, GL_LUMINANCE4,
GL_LUMINANCE8, GL_LUMINANCE12,
GL_LUMINANCE16, GL_LUMINANCE_ALPHA,
GL_LUMINANCE4_ALPHA4,
GL_LUMINANCE6_ALPHA2,
GL_LUMINANCE8_ALPHA8,
GL_LUMINANCE12_ALPHA4,
GL_LUMINANCE12_ALPHA12,
GL_LUMINANCE16_ALPHA16, GL_INTENSITY,
GL_INTENSITY4, GL_INTENSITY8,
GL_INTENSITY12, GL_INTENSITY16, GL_RGB,
GL_R3_G3_B2, GL_RGB4, GL_RGB5, GL_RGB8,
GL_RGB10, GL_RGB12, GL_RGB16, GL_RGBA,
GL_RGBA2, GL_RGBA4, GL_RGB5_A1, GL_RGBA8,
GL_RGB10_A2, GL_RGBA12, or GL_RGBA16.

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 image.
Must be 0 or $2**n ~+~ 2*$border for some
integer $n$. The height of the texture
image is 1.

border Specifies the width of the border. Must
be either 0 or 1.

DESCRIPTION
glCopyTexImage1D defines a one-dimensional texture image
with pixels from the current GL_READ_BUFFER.

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 glCopyP-
ixels had been called, but the process stops just before
final conversion. At this point all pixel component val-
ues 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 cur-
rent 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.

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 level is greater than
$log sub 2 max$, 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 inte-
ger 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 corre-
sponding execution of glEnd.

ASSOCIATED GETS
glGetTexImage
glIsEnabled with argument GL_TEXTURE_1D

SEE ALSO
glCopyPixels, glCopyTexImage2D, glCopyTexSubImage1D,
glCopyTexSubImage2D, glPixelStore, glPixelTransfer, glTex-
Env, glTexGen, glTexImage1D, glTexImage2D, glTexSubIm-
age1D, glTexSubImage2D,
glTexParameter

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