glCopyTexImage2D man page on RedHat
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GLCOPYTEXIMAGE2D(3G) OpenGL Manual GLCOPYTEXIMAGE2D(3G)
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/.
AUTHORS
opengl.org
opengl.org 03/16/2013 GLCOPYTEXIMAGE2D(3G)
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