GLGETCONVOLUTIONFILTER - Online Linux Manual PageSection : 3G
NAME"glGetConvolutionFilter − get current 1D or 2D convolution filter kernel
C SPECIFICATIONvoid glGetConvolutionFilter( GLenum target, GLenum format, GLenum type, GLvoid *image )
PARAMETERStarget  The filter to be retrieved. Must be one of ­GL_CONVOLUTION_1D or ­GL_CONVOLUTION_2D. format  Format of the output image. 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 image. 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. image  Pointer to storage for the output image.
DESCRIPTION­glGetConvolutionFilter returns the current 1D or 2D convolution filter kernel as an image. The one- or two-dimensional image is placed in image according to the specifications in format and type. No pixel transfer operations are performed on this image, but the relevant pixel storage modes are applied. Color components that are present in format but not included in the internal of the filter are returned as zero. The assignments of internal color components to the components of format are as follows.
.bp Internal ComponentResulting Component RedRed GreenGreen BlueBlue AlphaAlpha LuminanceRed IntensityRed
NOTES­glGetConvolutionFilter is present only if ­GL_ARB_imaging is returned when ­glGetString is called with an argument of ­GL_EXTENSIONS. The current separable 2D filter must be retrieved with ­glGetSeparableFilter rather than ­glGetConvolutionFilter.
ERRORS­GL_INVALID_ENUM is generated if target is not one of the allowable values. ­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 ­glGetConvolutionFilter 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 ALSO­glGetSeparableFilter(3G), ­glConvolutionParameter(3G), ­glConvolutionFilter1D(3G), ­glConvolutionFilter2D(3G) 0
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Online Linux Manual Page   :   Version   :   Online Linux Manual Page - Fedora.40 - march=x86-64 - mtune=generic - 24.12.05
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