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GLCOPYTEXIMAGE1D(3G)                             OpenGL 3.3                             GLCOPYTEXIMAGE1D(3G)



NAME
       glCopyTexImage1D - copy pixels into a 1D texture image

C SPECIFICATION
       void glCopyTexImage1D(GLenum target, GLint level, GLenum internalformat, GLint x, GLint y,
                             GLsizei width, GLint border);

PARAMETERS
       target
           Specifies the target texture. Must be GL_TEXTURE_1D.

       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 left corner of the row 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. The
           height of the texture image is 1.

       border
           Specifies the width of the border. Must be either 0 or 1.

DESCRIPTION
       glCopyTexImage1D defines a one-dimensional texture image with pixels from the current GL_READ_BUFFER.

       The screen-aligned pixel row with left corner at x y and with a length of width + 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 row 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 screen coordinates correspond to lower texture coordinates.

       If any of the pixels within the specified row 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.


       glCopyTexImage1D defines a one-dimensional texture image with pixels from the current GL_READ_BUFFER.

       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 0 width indicates a NULL texture.

ERRORS
       GL_INVALID_ENUM is generated if target is not one of the allowable values.


       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 internalformat is not an allowable value.


       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 cannot be
       represented as 2 n + 2 ^, border for some integer value of n.


       GL_INVALID_VALUE is generated if border is not 0 or 1.


       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
       glCopyTexImage2D(), glCopyTexSubImage1D(), glCopyTexSubImage2D(), glPixelStore(), glTexImage1D(),
       glTexImage2D(), glTexSubImage1D(), glTexSubImage2D(), glTexParameter()


COPYRIGHT
       Copyright (C) 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/.



OpenGL 3.3                                       03/08/2011                             GLCOPYTEXIMAGE1D(3G)