How to change background color of an OpenGL surfac

Question

Having

srf = pygame.display.set_mode(viewport, OPENGL | DOUBLEBUF)

and performing

srf.fill([255,255,255])

results in the following error message:

pygame.error: Cannot call on OPENGL Surfaces

How to solve this issue? How can I change the background color?

Answer 1

You have to use the glClearColor function to set the color you want to clear your screen to, and then use glClear to actually clear the screen with the color specified.

E.g. call

glClearColor(0.7, 0, 0, 1)

to set the color to red and then call

glClear(GL_COLOR_BUFFER_BIT)

to clear the screen to this color.