Specifies the target texture.
Must be GL_TEXTURE_2D.
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 lower left corner
of the rectangular region of pixels to be copied.
width
Specifies the width of the texture image.
Must be 0 or $2 sup n ~+~ 2*$border for some integer $n$.
height
Specifies the height of the texture image.
Must be 0 or $2 sup m ~+~ 2*$border for some integer $m$.
border
Specifies the width of the border.
Must be either 0 or 1.
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$~+~2~*~$border and a height of
height$~+~2~*~$border
defines the texture array
at the mipmap level specified by level.
internalformat specifies the internal of the texture array.
The pixels in the 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 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.
An image with height or width of 0 indicates a NULL texture.
When the GL_ARB_imaging extension is supported, the RGBA components
read 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 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 $log sub 2 max$,
where $max$ 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 $2 sup k ~+~ 2~*~$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.
ASSOCIATED GETS
glGetTexImage glIsEnabled with argument GL_TEXTURE_2D
