GLGETSEPARABLEFILTER - Online Linux Manual PageSection : 3G
NAME"glGetSeparableFilter − get separable convolution filter kernel images
C SPECIFICATIONvoid glGetSeparableFilter( GLenum target, GLenum format, GLenum type, GLvoid *row, GLvoid *column, GLvoid *span )
PARAMETERStarget  The separable filter to be retrieved. Must be ­GL_SEPARABLE_2D. format  Format of the output images. 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. type  Data type of components in the output images. 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. row  Pointer to storage for the row filter image. column  Pointer to storage for the column filter image. span  Pointer to storage for the span filter image (currently unused).
DESCRIPTION­glGetSeparableFilter returns the two one-dimensional filter kernel images for the current separable 2D convolution filter. The row image is placed in row and the column image is placed in column according to the specifications in format and type. (In the current implementation, span is not affected in any way.) No pixel transfer operations are performed on the images, but the relevant pixel storage modes are applied. Color components that are present in format but not included in the internal of the filters are returned as zero. The assignments of internal color components to the components of format are as follows: Internal ComponentResulting Component RedRed GreenGreen BlueBlue AlphaAlpha LuminanceRed IntensityRed
NOTES­glGetSeparableFilter is present only if ­GL_ARB_imaging is returned when ­glGetString is called with an argument of ­GL_EXTENSIONS. Non-separable 2D filters must be retrieved with ­glGetConvolutionFilter.
ERRORS­GL_INVALID_ENUM is generated if target is not ­GL_SEPARABLE_2D. ­GL_INVALID_ENUM is generated if format is not one of the allowable values. ­GL_INVALID_ENUM is generated if type is not one of the allowable values. ­GL_INVALID_OPERATION is generated if ­glGetSeparableFilter 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 format is neither ­GL_RGBA nor ­GL_BGRA.
ASSOCIATED GETS­glGetConvolutionParameter
SEE ALSO­glGetConvolutionFilter(3G), ­glConvolutionParameter(3G), ­glSeparableFilter2D(3G) 0
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