glgethistogram(3g) [xfree86 man page]
GLGETHISTOGRAM(3G) GLGETHISTOGRAM(3G) NAME
glGetHistogram - get histogram table C SPECIFICATION
void glGetHistogram( GLenum target, GLboolean reset, GLenum format, GLenum type, GLvoid *values ) PARAMETERS
target Must be GL_HISTOGRAM. reset If GL_TRUE, each component counter that is actually returned is reset to zero. (Other counters are unaffected.) If GL_FALSE, none of the counters in the histogram table is modified. format The of values 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. type The type of values 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 histogram table. DESCRIPTION
glGetHistogram returns the current histogram table as a one-dimensional image with the same width as the histogram. No pixel transfer operations are performed on this image, but pixel storage modes that are applicable to 1D images are honored. Color components that are requested in the specified format, but which are not included in the internal of the histogram, are returned as zero. The assignments of internal color components to the components requested by format are: ----------------------------------------- Internal Component Resulting Component ----------------------------------------- Red Red Green Green Blue Blue Alpha Alpha Luminance Red ----------------------------------------- NOTES
glGetHistogram is present only if GL_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_HISTOGRAM. 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 glGetHistogram 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. SEE ALSO
glHistogram(3G), glResetHistogram(3G), glGetHistogramParameter(3G) GLGETHISTOGRAM(3G)
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GLGETCONVOLUTIONFILTER(3G) GLGETCONVOLUTIONFILTER(3G) NAME
glGetConvolutionFilter - get current 1D or 2D convolution filter kernel C SPECIFICATION
void glGetConvolutionFilter( GLenum target, GLenum format, GLenum type, GLvoid *image ) PARAMETERS
target 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. DESCRIPTION
glGetConvolutionFilter 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. ----------------------------------------- Internal Component Resulting Component ----------------------------------------- Red Red Green Green Blue Blue Alpha Alpha Luminance Red Intensity Red ----------------------------------------- NOTES
glGetConvolutionFilter 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. ERRORS
GL_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 GETS
glGetConvolutionParameter SEE ALSO
glGetSeparableFilter(3G), glConvolutionParameter(3G), glConvolutionFilter1D(3G), glConvolutionFilter2D(3G) GLGETCONVOLUTIONFILTER(3G)