glclearcolor(3g) [osx man page]

GLCLEARCOLOR(3G)														  GLCLEARCOLOR(3G)

NAME

       glClearColor - specify clear values for the color buffers

C SPECIFICATION

       void glClearColor( GLclampf red,
			  GLclampf green,
			  GLclampf blue,
			  GLclampf alpha )

PARAMETERS

       red, green, blue, alpha
			     Specify  the  red, green, blue, and alpha values used when the color buffers are cleared.	The initial values are all
			     0.

DESCRIPTION

       glClearColor specifies the red, green, blue, and alpha values used by glClear to clear the color buffers.  Values specified by glClearColor
       are clamped to the range [0, 1].

ERRORS

       GL_INVALID_OPERATION is generated if glClearColor is executed between the execution of glBegin and the corresponding execution of glEnd.

ASSOCIATED GETS

       glGet with argument GL_COLOR_CLEAR_VALUE

SEE ALSO

       glClear

																  GLCLEARCOLOR(3G)

GLBLENDCOLOR(3G)														  GLBLENDCOLOR(3G)

NAME

       glBlendColor - set the blend color

C SPECIFICATION

       void glBlendColor( GLclampf red,
			  GLclampf green,
			  GLclampf blue,
			  GLclampf alpha )

PARAMETERS

       red, green, blue, alpha
			     specify the components of GL_BLEND_COLOR

DESCRIPTION

       The  GL_BLEND_COLOR  may  be  used  to calculate the source and destination blending factors. The color components are clamped to the range
       [0, 1] before being stored. See glBlendFunc for a complete description of the blending operations.  Initially the GL_BLEND_COLOR is set	to
       (0, 0, 0, 0).

NOTES

       glBlendColor  is  part  of the GL_ARB_imaging subset. glBlendColor is present only if GL_ARB_imaging is returned when glGetString is called
       with GL_EXTENSIONS as its argument.

ERRORS

       GL_INVALID_OPERATION is generated if glBlendColor is executed between the execution of glBegin and the corresponding execution of glEnd.

ASSOCIATED GETS

       glGet with an argument of GL_BLEND_COLOR

SEE ALSO

       glBlendEquation(3G), glBlendFunc(3G), glGetString(3G)

																  GLBLENDCOLOR(3G)