GLCOPYTEXIMAGE1D(3G)UNIX Programmer's Manual GLCOPYTEXIMAGE1D(3G)
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 )
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 of the texture. Must
be one of the following symbolic 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 2n + 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.
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GLCOPYTEXIMAGE1D(3G)UNIX Programmer's Manual GLCOPYTEXIMAGE1D(3G)
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 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 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.
An image with 0 width indicates a NULL texture.
When the GL_ARB_imaging extension is supported, the RGBA
components copied from the framebuffer may be processed by
the imaging pipeline. See glTexImage1D for specific
details.
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
log2max, 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 2n + 2 * (border) for some integer value of
n.
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GLCOPYTEXIMAGE1D(3G)UNIX Programmer's Manual GLCOPYTEXIMAGE1D(3G)
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
SEE ALSO
glCopyPixels(3G), glCopyTexImage2D(3G),
glCopyTexSubImage1D(3G), glCopyTexSubImage2D(3G),
glPixelStore(3G), glPixelTransfer(3G), glTexEnv(3G),
glTexGen(3G), glTexImage1D(3G), glTexImage2D(3G),
glTexSubImage1D(3G), glTexSubImage2D(3G),
glTexParameter(3G)
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