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 format of the texture.
Must be one of the following symbolic constants: GL_COMPRESSED_RED,
GL_COMPRESSED_RG, GL_COMPRESSED_RGB, GL_COMPRESSED_RGBA.
GL_COMPRESSED_SRGB, GL_COMPRESSED_SRGB_ALPHA.
GL_DEPTH_COMPONENT, GL_DEPTH_COMPONENT16,
GL_DEPTH_COMPONENT24, GL_DEPTH_COMPONENT32, GL_RED,
GL_RG, 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,
GL_RGBA16, GL_SRGB, GL_SRGB8, GL_SRGB_ALPHA, or
GL_SRGB8_ALPHA8.
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
glReadPixels() 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.
glCopyTexImage1D defines a one-dimensional texture image with pixels from
the current
GL_READ_BUFFER.
When
internalformat is one of the sRGB types, the GL does not
automatically convert the source pixels to the sRGB color space. In this case,
the
glPixelMap function can be used to accomplish the conversion.
NOTES¶
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 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
GL_MAX_TEXTURE_SIZE.
GL_INVALID_VALUE is generated if non-power-of-two textures are not
supported and the
width 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
internalformat is
GL_DEPTH_COMPONENT,
GL_DEPTH_COMPONENT16,
GL_DEPTH_COMPONENT24, or
GL_DEPTH_COMPONENT32 and there is no
depth buffer.
ASSOCIATED GETS¶
glGetTexImage()
SEE ALSO¶
glCopyTexImage2D(),
glCopyTexSubImage1D(),
glCopyTexSubImage2D(),
glPixelStore(),
glTexImage1D(),
glTexImage2D(),
glTexSubImage1D(),
glTexSubImage2D(),
glTexParameter()
COPYRIGHT¶
Copyright © 1991-2006 Silicon Graphics, Inc. This document is licensed
under the SGI Free Software B License. For details, see
http://oss.sgi.com/projects/FreeB/.
