glClearColor - specify clear values for the color buffers
void glClearColor( GLclampf red,
GLclampf green,
GLclampf blue,
GLclampf alpha )
- 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.
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].
GL_INVALID_OPERATION is generated if glClearColor is executed
between the execution of glBegin and the corresponding execution of
glEnd.
glGet with argument GL_COLOR_CLEAR_VALUE