GL_SGI_fft http://www.opengl.org/registry/specs/SGI/fft.txt GL_SGI_fft GL_PIXEL_TRANSFORM_OPERATOR_SGI 0x81C4 GL_CONVOLUTION_SGI 0x81C5 GL_FFT_1D_SGI 0x81C6 GL_PIXEL_TRANSFORM_SGI 0x81C7 GL_MAX_FFT_WIDTH_SGI 0x81C8 void glGetPixelTransformParameterfvSGI (GLenum target, GLenum pname, GLfloat* params) void glGetPixelTransformParameterivSGI (GLenum target, GLenum pname, GLint* params) void glPixelTransformParameterfSGI (GLenum target, GLenum pname, GLfloat param) void glPixelTransformParameterfvSGI (GLenum target, GLenum pname, const GLfloat* params) void glPixelTransformParameteriSGI (GLenum target, GLenum pname, GLint param) void glPixelTransformParameterivSGI (GLenum target, GLenum pname, const GLint* params) void glPixelTransformSGI (GLenum target)