glTexSubImage1D man page on Darwin

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GLTEXSUBIMAGE1D(3G)					   GLTEXSUBIMAGE1D(3G)

NAME
       glTexSubImage1D - specify a one-dimensional texture subimage

C SPECIFICATION
       void glTexSubImage1D( GLenum target,
			     GLint level,
			     GLint xoffset,
			     GLsizei width,
			     GLenum format,
			     GLenum type,
			     const GLvoid *pixels )

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.

       xoffset	Specifies a texel offset in the x direction within the texture
		array.

       width	Specifies the width of the texture subimage.

       format	Specifies  the	format	of the pixel data.  The following sym‐
		bolic values are accepted: GL_COLOR_INDEX,  GL_RED,  GL_GREEN,
		GL_BLUE,   GL_ALPHA,   GL_RGB,	 GL_BGR,   GL_RGBA,   GL_BGRA,
		GL_LUMINANCE, and GL_LUMINANCE_ALPHA.

       type	Specifies the data type of the pixel data.  The following sym‐
		bolic	values	 are   accepted:   GL_UNSIGNED_BYTE,  GL_BYTE,
		GL_BITMAP,   GL_UNSIGNED_SHORT,	  GL_SHORT,   GL_UNSIGNED_INT,
		GL_INT,		   GL_FLOAT,	       GL_UNSIGNED_BYTE_3_3_2,
		GL_UNSIGNED_BYTE_2_3_3_REV,	      GL_UNSIGNED_SHORT_5_6_5,
		GL_UNSIGNED_SHORT_5_6_5_REV,	    GL_UNSIGNED_SHORT_4_4_4_4,
		GL_UNSIGNED_SHORT_4_4_4_4_REV,	    GL_UNSIGNED_SHORT_5_5_5_1,
		GL_UNSIGNED_SHORT_1_5_5_5_REV,	      GL_UNSIGNED_INT_8_8_8_8,
		GL_UNSIGNED_INT_8_8_8_8_REV,  GL_UNSIGNED_INT_10_10_10_2,  and
		GL_UNSIGNED_INT_2_10_10_10_REV.

       pixels	Specifies a pointer to the image data in memory.

DESCRIPTION
       Texturing maps a portion of a specified texture image onto each graphi‐
       cal primitive for which texturing is enabled.   To  enable  or  disable
       one-dimensional	texturing,  call  glEnable and glDisable with argument
       GL_TEXTURE_1D.

       glTexSubImage1D redefines a contiguous subregion of  an	existing  one-
       dimensional texture image.  The texels referenced by pixels replace the
       portion of the existing texture array with x indices xoffset and	 xoff‐
       set+width-1,inclusive.	This region may not include any texels outside
       the range of the texture array as it was originally specified.	It  is
       not an error to specify a subtexture with width of 0, but such a speci‐
       fication has no effect.

NOTES
       glTexSubImage1D 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.

       Formats	 GL_BGR,   and	 GL_BGRA   and	types  GL_UNSIGNED_BYTE_3_3_2,
       GL_UNSIGNED_BYTE_2_3_3_REV,		      GL_UNSIGNED_SHORT_5_6_5,
       GL_UNSIGNED_SHORT_5_6_5_REV,		    GL_UNSIGNED_SHORT_4_4_4_4,
       GL_UNSIGNED_SHORT_4_4_4_4_REV,		    GL_UNSIGNED_SHORT_5_5_5_1,
       GL_UNSIGNED_SHORT_1_5_5_5_REV,		      GL_UNSIGNED_INT_8_8_8_8,
       GL_UNSIGNED_INT_8_8_8_8_REV,	 GL_UNSIGNED_INT_10_10_10_2,	   and
       GL_UNSIGNED_INT_2_10_10_10_REV  are available only if the GL version is
       1.2 or greater.

       When the GL_ARB_multitexture extension  is  supported,  glTexSubImage1D
       specifies  a  one-dimensional sub texture for the current texture unit,
       specified with glActiveTextureARB.

       When the GL_ARB_imaging extension is  supported,	 the  RGBA  components
       specified  in  pixels  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 val‐
       ues.

       GL_INVALID_OPERATION  is	 generated  if	the texture array has not been
       defined by a previous glTexImage1D operation.

       GL_INVALID_VALUE is generated if level is less than 0.

       GL_INVALID_VALUE may be generated if level is greater  than  log2(max),
       where max is the returned value of GL_MAX_TEXTURE_SIZE.

       GL_INVALID_VALUE is generated if xoffset<-b, or if (xoffset+width) > (w
       - b), where w is the GL_TEXTURE_WIDTH,  and  b  is  the	width  of  the
       GL_TEXTURE_BORDER  of  the  texture  image being modified.  Note that w
       includes twice the border width.

       GL_INVALID_VALUE is generated if width is less than 0.

       GL_INVALID_ENUM is generated if format is not an accepted
	constant.

       GL_INVALID_ENUM is generated if type is not a type constant.

       GL_INVALID_ENUM is generated if type is GL_BITMAP  and  format  is  not
       GL_COLOR_INDEX.

       GL_INVALID_OPERATION   is  generated  if	 glTexSubImage1D  is  executed
       between the execution of glBegin and  the  corresponding	 execution  of
       glEnd.

       GL_INVALID_OPERATION    is    generated	  if	type	is    one   of
       GL_UNSIGNED_BYTE_3_3_2,			   GL_UNSIGNED_BYTE_2_3_3_REV,
       GL_UNSIGNED_SHORT_5_6_5,	 or  GL_UNSIGNED_SHORT_5_6_5_REV and format is
       not GL_RGB.

       GL_INVALID_OPERATION   is    generated	 if    type    is    one    of
       GL_UNSIGNED_SHORT_4_4_4_4,		GL_UNSIGNED_SHORT_4_4_4_4_REV,
       GL_UNSIGNED_SHORT_5_5_5_1,		GL_UNSIGNED_SHORT_1_5_5_5_REV,
       GL_UNSIGNED_INT_8_8_8_8,			  GL_UNSIGNED_INT_8_8_8_8_REV,
       GL_UNSIGNED_INT_10_10_10_2, or GL_UNSIGNED_INT_2_10_10_10_REV and  for‐
       mat is neither GL_RGBA nor GL_BGRA.

ASSOCIATED GETS
       glGetTexImage
       glIsEnabled with argument GL_TEXTURE_1D

SEE ALSO
       glActiveTextureARB,	   glCopyTexImage1D,	     glCopyTexImage2D,
       glCopyTexSubImage1D,	glCopyTexSubImage2D,	  glCopyTexSubImage3D,
       glDrawPixels,   glPixelStore,   glPixelTransfer,	  glTexEnv,  glTexGen,
       glTexImage1D,	 glTexImage2D,	    glTexImage3D,      glTexParameter,
       glTexSubImage2D, glTexSubImage3D

							   GLTEXSUBIMAGE1D(3G)
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