glCopyTexImage2D : PyOpenGL 3.0.1b1 GL Man Pages

copy pixels into a 2D texture image

Signature

glCopyTexImage2D( GLenum ( target ) , GLint ( level ) , GLenum ( internalformat ) , GLint ( x ) , GLint ( y ) , GLsizei ( width ) , GLsizei ( height ) , GLint ( border ) )-> void

glCopyTexImage2D( target , level , internalFormat , x , y , width , height , border )

glCopyTexImage2D( GLenum(target), GLint(level), GLenum(internalFormat), GLint(x), GLint(y), GLsizei(width), GLsizei(height), GLint(border) ) -> None

Parameters

Variables	Description
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 n th mipmap reduction image.
internalformat	Specifies the internal format of the texture. Must be one of the following symbolic constants: GL_ALPHA , GL_ALPHA4 , GL_ALPHA8 , GL_ALPHA12 , GL_ALPHA16 , GL_COMPRESSED_ALPHA , GL_COMPRESSED_LUMINANCE , GL_COMPRESSED_LUMINANCE_ALPHA , GL_COMPRESSED_INTENSITY , GL_COMPRESSED_RGB , GL_COMPRESSED_RGBA , GL_DEPTH_COMPONENT , GL_DEPTH_COMPONENT16 , GL_DEPTH_COMPONENT24 , GL_DEPTH_COMPONENT32 , 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 , GL_RGBA16 , GL_SLUMINANCE , GL_SLUMINANCE8 , GL_SLUMINANCE_ALPHA , GL_SLUMINANCE8_ALPHA8 , 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 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 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

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

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_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 , GL_TEXTURE_CUBE_MAP_NEGATIVE_Z , or GL_PROXY_TEXTURE_CUBE_MAP are available only if the GL version is 1.3 or greater.

GL_DEPTH_COMPONENT , GL_DEPTH_COMPONENT16 , GL_DEPTH_COMPONENT24 , and GL_DEPTH_COMPONENT32 are available only if the GL version is 1.4 or greater.

The GL_SRGB , GL_SRGB8 , GL_SRGB_ALPHA , GL_SRGB8_ALPHA8 , GL_SLUMINANCE , GL_SLUMINANCE8 , GL_SLUMINANCE_ALPHA , and GL_SLUMINANCE8_ALPHA8 internal formats are only available if the GL version is 2.1 or greater. See glTexImage2D for specific details about sRGB conversion.

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 2 + 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 glCopyTexImage2D is executed between the execution of glBegin and the corresponding execution of glEnd .

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

glIsEnabled with argument GL_TEXTURE_2D or GL_TEXTURE_CUBE_MAP

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/ .

Sample Code References

The following code samples have been found which appear to reference the functions described here. Take care that the code may be old, broken or not even use PyOpenGL.

glCopyTexImage2D

{LGPL} VisionEgg VisionEgg/Textures.py Lines: 1055

{LGPL} Pyggel pyggel/data.py Lines: 621