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GLMINMAX(3G)							  GLMINMAX(3G)

NAME
       glMinmax - define minmax table

C SPECIFICATION
       void glMinmax( GLenum target,
		      GLenum internalformat,
		      GLboolean sink )

PARAMETERS
       target	       The  minmax table whose parameters are to be set.  Must
		       be GL_MINMAX.

       internalformat  The  of entries in the minmax table.  Must  be  one  of
		       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_R3_G3_B2,   GL_RGB,	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.

       sink	       If GL_TRUE, pixels  will	 be  consumed  by  the	minmax
		       process	and  no	 drawing  or texture loading will take
		       place.  If GL_FALSE, pixels will proceed to  the	 final
		       conversion process after minmax.

DESCRIPTION
       When  GL_MINMAX	is enabled, the RGBA components of incoming pixels are
       compared to the minimum and maximum values for  each  component,	 which
       are  stored  in	the 2-element minmax table.  (The first element stores
       the minima, and the second element stores the maxima.)  If a pixel com‐
       ponent  is greater than the corresponding component in the maximum ele‐
       ment, then the maximum element is  updated  with	 the  pixel  component
       value.	If  a pixel component is less than the corresponding component
       in the minimum element, then the minimum element is  updated  with  the
       pixel  component value.	(In both cases, if the internal	 of the minmax
       table includes luminance, then the R color component of incoming pixels
       is  used	 for  comparison.)   The  contents  of the minmax table may be
       retrieved at a later time by calling glGetMinmax.  The minmax operation
       is  enabled or disabled by calling glEnable or glDisable, respectively,
       with an argument of GL_MINMAX.

       glMinmax redefines the current minmax table  to	have  entries  of  the
       specified  by  internalformat.  The maximum element is initialized with
       the smallest possible component values, and the minimum element is ini‐
       tialized with the largest possible component values.  The values in the
       previous minmax table, if any, are lost.	 If sink is GL_TRUE, then pix‐
       els  are	 discarded  after  minmax; no further processing of the pixels
       takes place, and no drawing, texture loading, or	 pixel	readback  will
       result.

NOTES
       glMinmax is present only if GL_ARB_imaging is returned when glGetString
       is called with an argument of GL_EXTENSIONS.

ERRORS
       GL_INVALID_ENUM is generated if target is not one of the allowable val‐
       ues.

       GL_INVALID_ENUM is generated if internalformat is not one of the allow‐
       able values.

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

ASSOCIATED GETS
       glGetMinmaxParameter

SEE ALSO
       glGetMinmax(3G), glResetMinmax(3G)

								  GLMINMAX(3G)
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