GLGETMINMAX(3G) UNIX Programmer's Manual GLGETMINMAX(3G)
glGetMinmax - get minimum and maximum pixel values
void glGetMinmax( GLenum target,
GLboolean reset,
GLenum format,
GLenum types,
GLvoid *values )
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 min-
max table is unaltered.
format The 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. Sym-
bolic 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.
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 of the return values is determined by
format, and their type is determined by types.
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GLGETMINMAX(3G) UNIX Programmer's Manual GLGETMINMAX(3G)
No pixel transfer operations are performed on the return
values, but pixel storage modes that are applicable to 1-
dimensional images are performed. Color components that are
requested in the specified format, but that are not included
in the internal of the minmax table, are returned as zero.
The assignment of internal color components to the com-
ponents requested by format are as follows:
________________________________________
Internal Component Resulting 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.
glGetMinmax is present only if GL_ARB_imaging is returned
when glGetString is called with an argument of
GL_EXTENSIONS.
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 glGetMinmax is executed
between the execution of glBegin and the corresponding exe-
cution of glEnd.
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
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GLGETMINMAX(3G) UNIX Programmer's Manual GLGETMINMAX(3G)
GL_UNSIGNED_INT_2_10_10_10_REV and format is neither GL_RGBA
nor GL_BGRA.
glMinmax(3G), glResetMinmax(3G), glGetMinmaxParameter(3G)
MirOS BSD #10-current Printed 20.2.2012 3
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