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Manual Reference Pages  - GLGETMINMAX (3G)

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glGetMinmax - get minimum and maximum pixel values

CONTENTS

C Specification
Parameters
Description
Notes
Errors
See Also

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 minmax 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. 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.

 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.

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 components 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 execution 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  GL_UNSIGNED_INT_2_10_10_10_REV and format is neither  GL_RGBA nor  GL_BGRA.

 glMinmax(3G),  glResetMinmax(3G),  glGetMinmaxParameter(3G)

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