NAME¶
glCopyTexImage2D - copy pixels into a 2D texture image
C SPECIFICATION¶
void
glCopyTexImage2D(GLenum target,
GLint level, GLenum internalformat,
GLint x, GLint y,
GLsizei width, GLsizei height,
GLint border);
PARAMETERS¶
target
Specifies the target texture. Must be
GL_TEXTURE_2D, GL_TEXTURE_CUBE_MAP_POSITIVE_X,
GL_TEXTURE_CUBE_MAP_NEGATIVE_X, GL_TEXTURE_CUBE_MAP_POSITIVE_Y,
GL_TEXTURE_CUBE_MAP_NEGATIVE_Y, GL_TEXTURE_CUBE_MAP_POSITIVE_Z,
or GL_TEXTURE_CUBE_MAP_NEGATIVE_Z.
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 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 n + 2 border for some integer n.
height
Specifies the height of the texture image.
Must be 0 or 2 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, or cube-map
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 format of the
texture array.
The pixels in the rectangle 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 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.
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 height or width of 0 indicates a NULL texture.
ERRORS¶
GL_INVALID_ENUM is generated if
target is not
GL_TEXTURE_2D,
GL_TEXTURE_CUBE_MAP_POSITIVE_X,
GL_TEXTURE_CUBE_MAP_NEGATIVE_X,
GL_TEXTURE_CUBE_MAP_POSITIVE_Y,
GL_TEXTURE_CUBE_MAP_NEGATIVE_Y,
GL_TEXTURE_CUBE_MAP_POSITIVE_Z,
or
GL_TEXTURE_CUBE_MAP_NEGATIVE_Z.
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
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 or
depth cannot be represented as 2 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 an accepted
format.
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¶
glCopyTexImage1D(),
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/.