glGetMultisamplefv - retrieve the location of a sample

void glGetMultisamplefv(GLenum pname, GLuint index, GLfloat *val);


Specifies the sample parameter name. pname must be GL_SAMPLE_POSITION.


Specifies the index of the sample whose position to query.


Specifies the address of an array to receive the position of the sample.

glGetMultisamplefv queries the location of a given sample. pname specifies the sample parameter to retrieve and must be GL_SAMPLE_POSITION. index corresponds to the sample for which the location should be returned. The sample location is returned as two floating-point values in val[0] and val[1], each between 0 and 1, corresponding to the x and y locations respectively in the GL pixel space of that sample. (0.5, 0.5) this corresponds to the pixel center. index must be between zero and the value of GL_SAMPLES - 1.

If the multisample mode does not have fixed sample locations, the returned values may only reflect the locations of samples within some pixels.

GL_INVALID_ENUM is generated if pname is not one GL_SAMPLE_POSITION.

GL_INVALID_VALUE is generated if index is greater than or equal to the value of GL_SAMPLES.

glGenFramebuffers(), glBindFramebuffer()

Copyright © 2010 Khronos Group. This material may be distributed subject to the terms and conditions set forth in the Open Publication License, v 1.0, 8 June 1999.

03/08/2011 OpenGL 3.3