MirOS Manual: glCopyTexImage1D(3)


GLCOPYTEXIMAGE1D(3G)UNIX Programmer's Manual 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  of the texture. Must
                     be one of the following symbolic constants:
                     GL_ALPHA, GL_ALPHA4, GL_ALPHA8, GL_ALPHA12,
                     GL_ALPHA16, 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, or GL_RGBA16.

     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 2n + 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.

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GLCOPYTEXIMAGE1D(3G)UNIX Programmer's Manual GLCOPYTEXIMAGE1D(3G)

     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  of the texture array.

     The pixels in the row 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  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.

NOTES

     glCopyTexImage1D 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 0 width indicates a NULL texture.

     When the GL_ARB_imaging extension is supported, the RGBA
     components copied from the framebuffer may be processed by
     the imaging pipeline.  See glTexImage1D for specific
     details.

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
     log2max, 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 2 + GL_MAX_TEXTURE_SIZE, or if it cannot be
     represented as 2n + 2 * (border) for some integer value of
     n.

MirOS BSD #10-current  Printed 03.04.2017                       2

GLCOPYTEXIMAGE1D(3G)UNIX Programmer's Manual GLCOPYTEXIMAGE1D(3G)

     GL_INVALID_VALUE is generated if border is not 0 or 1.

     GL_INVALID_OPERATION is generated if glCopyTexImage1D is
     executed between the execution of glBegin and the
     corresponding execution of glEnd.

ASSOCIATED GETS

     glGetTexImage
     glIsEnabled with argument GL_TEXTURE_1D

SEE ALSO

     glCopyPixels(3G), glCopyTexImage2D(3G),
     glCopyTexSubImage1D(3G), glCopyTexSubImage2D(3G),
     glPixelStore(3G), glPixelTransfer(3G), glTexEnv(3G),
     glTexGen(3G), glTexImage1D(3G), glTexImage2D(3G),
     glTexSubImage1D(3G), glTexSubImage2D(3G),
     glTexParameter(3G)

MirOS BSD #10-current  Printed 03.04.2017                       3

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