void glGetHistogramParameterfv
| ( | GLenum target
, GLenum pname
, GLfloat *params
); |
void glGetHistogramParameteriv
| ( | GLenum target
, GLenum pname
, GLint *params
); |
glGetHistogramParameterfv
| ( |
target
,
pname
) →
params
|
glGetHistogramParameteriv
| ( |
target
,
pname
) →
params
|
glGetHistogramParameter is used to query parameter values for the current histogram or for a proxy. The histogram state information may be queried by calling glGetHistogramParameter with a target of GL_HISTOGRAM (to obtain information for the current histogram table) or GL_PROXY_HISTOGRAM (to obtain information from the most recent proxy request) and one of the following values for the pname argument:
Parameter | Description |
GL_HISTOGRAM_WIDTH | Histogram table width |
GL_HISTOGRAM_FORMAT | Internal |
GL_HISTOGRAM_RED_SIZE | Red component counter size, in bits |
GL_HISTOGRAM_GREEN_SIZE | Green component counter size, in bits |
Parameter | Description |
GL_HISTOGRAM_BLUE_SIZE | Blue component counter size, in bits |
GL_HISTOGRAM_ALPHA_SIZE | Alpha component counter size, in bits |
GL_HISTOGRAM_LUMINANCE_SIZE | Luminance component counter size, in bits |
GL_HISTOGRAM_SINK | Value of the sink parameter |
glGetHistogramParameter 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 one of the allowable values.
GL_INVALID_ENUM is generated if pname is not one of the allowable values.
GL_INVALID_OPERATION is generated if glGetHistogramParameter is executed between the execution of glBegin and the corresponding execution of glEnd.