glGetMinmax man page on RedHat
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GLGETMINMAX(3G) OpenGL Manual GLGETMINMAX(3G)
NAME
glGetMinmax - get minimum and maximum pixel values
C SPECIFICATION
void glGetMinmax(GLenum target, GLboolean reset, GLenum format,
GLenum types, GLvoid * values);
PARAMETERS
target
Must be GL_MINMAX.
reset
If GL_TRUE, all entries in the minmax table that are actually
returned are reset to their initial values. (Other entries are
unaltered.) If GL_FALSE, the minmax table is unaltered.
format
The format of the data to be returned in values. Must be one of
GL_RED, GL_GREEN, GL_BLUE, GL_ALPHA, GL_RGB, GL_BGR, GL_RGBA,
GL_BGRA, GL_LUMINANCE, or GL_LUMINANCE_ALPHA.
types
The type of the data to be returned in values. Symbolic constants
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 are accepted.
values
A pointer to storage for the returned values.
DESCRIPTION
glGetMinmax returns the accumulated minimum and maximum pixel values
(computed on a per-component basis) in a one-dimensional image of width
2. The first set of return values are the minima, and the second set of
return values are the maxima. The format of the return values is
determined by format, and their type is determined by types.
If a non-zero named buffer object is bound to the GL_PIXEL_PACK_BUFFER
target (see glBindBuffer()) while minimum and maximum pixel values are
requested, values is treated as a byte offset into the buffer object's
data store.
No pixel transfer operations are performed on the return values, but
pixel storage modes that are applicable to one-dimensional images are
performed. Color components that are requested in the specified format,
but that are not included in the internal format of the minmax table,
are returned as zero. The assignment of internal color components to
the components requested by format are as follows:
┌─────────────────────────────────┬───────────────────────────────────┐
│ │ │
│ Internal │ Resulting │
│Component │ Component │
│ │ │
├─────────────────────────────────┼───────────────────────────────────┤
│Red │ Red │
├─────────────────────────────────┼───────────────────────────────────┤
│Green │ Green │
├─────────────────────────────────┼───────────────────────────────────┤
│Blue │ Blue │
├─────────────────────────────────┼───────────────────────────────────┤
│Alpha │ Alpha │
├─────────────────────────────────┼───────────────────────────────────┤
│Luminance │ Red │
└─────────────────────────────────┴───────────────────────────────────┘
If reset is GL_TRUE, the minmax table entries corresponding to the
return values are reset to their initial values. Minimum and maximum
values that are not returned are not modified, even if reset is
GL_TRUE.
NOTES
glGetMinmax is present only if ARB_imaging is returned when
glGetString() is called with an argument of GL_EXTENSIONS.
ERRORS
GL_INVALID_ENUM is generated if target is not GL_MINMAX.
GL_INVALID_ENUM is generated if format is not one of the allowable
values.
GL_INVALID_ENUM is generated if types is not one of the allowable
values.
GL_INVALID_OPERATION is generated if types 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 types 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
format is neither GL_RGBA nor GL_BGRA.
GL_INVALID_OPERATION is generated if a non-zero buffer object name is
bound to the GL_PIXEL_PACK_BUFFER target and the buffer object's data
store is currently mapped.
GL_INVALID_OPERATION is generated if a non-zero buffer object name is
bound to the GL_PIXEL_PACK_BUFFER target and the data would be packed
to the buffer object such that the memory writes required would exceed
the data store size.
GL_INVALID_OPERATION is generated if a non-zero buffer object name is
bound to the GL_PIXEL_PACK_BUFFER target and values is not evenly
divisible into the number of bytes needed to store in memory a datum
indicated by type.
GL_INVALID_OPERATION is generated if glGetMinmax is executed between
the execution of glBegin() and the corresponding execution of glEnd().
ASSOCIATED GETS
glGetMinmaxParameter()
glGet() with argument GL_PIXEL_PACK_BUFFER_BINDING
SEE ALSO
glMinmax(), glResetMinmax(),
COPYRIGHT
Copyright © 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/.
AUTHORS
opengl.org
opengl.org 03/16/2013 GLGETMINMAX(3G)
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