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glCopyTexSubImage2D

Chapter 3

If any of the pixels within the speciﬁed rectangle of the current GL_READ_BUFFER are

outside the read window associated with the current rendering context, then the values

obtained for those pixels are undeﬁned.

No change is made to the internalformat, width, height, or border parameters of the

speciﬁed texture array or to texel values outside the speciﬁed subregion.

Notes

glCopyTexSubImage2D is available only if the GL version is 1.1 or greater.

Texturing has no effect in color index mode.

glPixelStore and glPixelTransfer modes affect texture images in exactly the way they

affect glDrawPixels.

Errors

• GL_INVALID_ENUM is generated if target is not GL_TEXTURE_2D.

• GL_INVALID_OPERATION is generated if the texture array has not been deﬁned

by a previous glTexImage2D or glCopyTexImage2D operation.

• GL_INVALID_VALUE is generated if level is less than 0.

• GL_INVALID_VALUE may be generated if level is greater than log

max, where max

is the returned value of GL_MAX_TEXTURE_SIZE.

• GL_INVALID_VALUE is generated if x<-bor if y<-b, where b is the border width

of the texture array.

• GL_INVALID_VALUE is generated if xoffset < - b,(xoffset + width)>(w- b), yoffset <

- b, or (yoffset + height) > (h - b), where w is the GL_TEXTURE_WIDTH, h is the

GL_TEXTURE_HEIGHT, and b is the GL_TEXTURE_BORDER of the texture

image being modiﬁed. Note that w and h include twice the border width.

• GL_INVALID_OPERATION is generated if glCopyTexSubImage2D is executed

between the execution of glBegin and the corresponding execution of glEnd.

Associated gets

glGetTexImage

glIsEnabled with argument GL_TEXTURE_2D

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