GlCopyTexSubImage1D
_glCopyTexSubImage1D: copy a one-dimensional texture subimage
Syntax
- SUB _glCopyTexSubImage1D (BYVAL target AS _UNSIGNED LONG, BYVAL level AS LONG, BYVAL xoffset AS LONG, BYVAL x AS LONG, BYVAL y AS LONG, BYVAL width AS LONG)
- void _glCopyTexSubImage1D(GLenum target, GLint level, GLint xoffset, GLint x, GLint y, GLsizei width);
- target
- Specifies the target texture. Must be Template:KW.
- level
- Specifies the level-of-detail number. Level 0 is the base image level. Level n is the nth mipmap reduction image.
- xoffset
- Specifies the texel offset within the texture array.
- 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 subimage.
Description
_glCopyTexSubImage1D replaces a portion of a one-dimensional texture image with pixels from the current Template:KW (rather than from main memory, as is the case for Template:KW).
The screen-aligned pixel row with left corner at (x,\ y), and with length width replaces the portion of the texture array with x indices xoffset through xoffset + width - 1, inclusive. The destination in the texture array may not include any texels outside the texture array as it was originally specified.
The pixels in the row are processed exactly as if Template:KW 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.
It is not an error to specify a subtexture with zero width, but such a specification has no effect. If any of the pixels within the specified row of the current Template:KW 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, or border parameters of the specified texture array or to texel values outside the specified subregion.
The Template:KW mode affects texture images.
Template:KW is generated if /target is not Template:KW.
Template:KW is generated if the texture array has not been defined by a previous Template:KW or Template:KW operation.
Template:KW is generated if level is less than 0.
Template:KW may be generated if level is greater than log<sub>2</sub>(max), where max is the returned value of Template:KW.
Template:KW is generated if xoffset < 0 or xoffset + width > w, where w is the Template:KW.
See also
SUB _GL Template:KW, Template:KW, Template:KW, Template:KW, Template:KW, Template:KW, Template:KW, Template:KW