fglcopyteximage1d man page on IRIX

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fglCopyTexImage1D(3G)	       OpenGL Reference		 fglCopyTexImage1D(3G)

NAME
     fglCopyTexImage1D - copy pixels into a 1D texture image

FORTRAN SPECIFICATION
     SUBROUTINE fglCopyTexImage1D( INTEGER*4 target,
				   INTEGER*4 level,
				   INTEGER*4 internalformat,
				   INTEGER*4 x,
				   INTEGER*4 y,
				   INTEGER*4 width,
				   INTEGER*4 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_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
		      n
		     2	+ 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
     fglCopyTexImage1D 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

									Page 1

fglCopyTexImage1D(3G)	       OpenGL Reference		 fglCopyTexImage1D(3G)

     texture array.

     The pixels in the row are processed exactly as if fglCopyPixels 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.

NOTES
     fglCopyTexImage1D 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 fglTexImage1D 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 log max, where
								   2
     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 +
							     n
     GL_MAX_TEXTURE_SIZE, or if it cannot be represented as 2  + 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 fglCopyTexImage1D is executed
     between the execution of fglBegin and the corresponding execution of
     fglEnd.

									Page 2

fglCopyTexImage1D(3G)	       OpenGL Reference		 fglCopyTexImage1D(3G)

ASSOCIATED GETS
     fglGetTexImage
     fglIsEnabled with argument GL_TEXTURE_1D

MACHINE DEPENDENCIES
     fglCopyTexImage1D and fglCopyTexImage1DEXT are not supported on
     RealityEngine, RealityEngine2, and VTX systems.

     On InfiniteReality systems, there is a performance benefit when the width
     of the image to be transferred to texture memory is a multiple of 8.

     Texture borders are not supported on InfiniteReality systems.
     Applications should use borderless textures and GL_CLAMP_TO_EDGE_SGIS
     wrap mode.

     On High Impact and Maximum Impact systems the number of bits per
     component, represented internally, is the same for all components and
     will be 4, 8, or 12 bits per component. All specified internal formats
     will receive an equal or greater representation in this scheme, up to the
     12-bit limit.  High Impact and Maximum Impact on Indigo2 systems do not
     support texture internal formats of the type GL_INTENSITY or GL_ALPHA,
     although High Impact and Maximum Impact on Octane systems do support
     these types.

     High Impact and Maximum Impact on Indigo2 systems without the TRAM option
     card support 4 bits per component for GL_RGB and GL_RGBA, 4/8 bits per
     component for GL_LUMINANCE_ALPHA, and 4/8/12 bits per component for
     GL_LUMINANCE.

SEE ALSO
     fglCopyPixels, fglCopyTexImage2D, fglCopyTexSubImage1D,
     fglCopyTexSubImage2D, fglPixelStore, fglPixelTransfer, fglTexEnv,
     fglTexGen, fglTexImage1D, fglTexImage2D, fglTexSubImage1D,
     fglTexSubImage2D, fglTexParameter

									Page 3

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