GLCOPYTEXIMAGE2D(3G)UNIX Programmer's Manual GLCOPYTEXIMAGE2D(3G)
glCopyTexImage2D - copy pixels into a 2D texture image
void glCopyTexImage2D( GLenum target,
GLint level,
GLenum internalformat,
GLint x,
GLint y,
GLsizei width,
GLsizei height,
GLint border )
target 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 2n + 2*border for some integer
n.
height Specifies the height of the texture image.
Must be 0 or 2m + 2*border for some integer
m.
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GLCOPYTEXIMAGE2D(3G)UNIX Programmer's Manual GLCOPYTEXIMAGE2D(3G)
border Specifies the width of the border. Must be
either 0 or 1.
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 mip-
map 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.
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.
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
log2max, 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
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GLCOPYTEXIMAGE2D(3G)UNIX Programmer's Manual GLCOPYTEXIMAGE2D(3G)
height cannot be represented as 2k + 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.
glGetTexImage
glIsEnabled with argument GL_TEXTURE_2D
glCopyPixels(3G), glCopyTexImage1D(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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