Method construct

example_scenes/opengl.py:241–285

(self)

class SimpleInlineFullScreenQuad(Scene):
    def construct(self):
        surface = FullScreenQuad(
            self.renderer.context,
            """
            #version 330

            uniform float v_red;
            uniform float v_green;
            uniform float v_blue;
            out vec4 frag_color;

            void main() {
              frag_color = vec4(v_red, v_green, v_blue, 1);
            }
            """,
        )
        surface.shader.set_uniform("v_red", 0)
        surface.shader.set_uniform("v_green", 0)
        surface.shader.set_uniform("v_blue", 0)

        increase = True
        val = 0.5
        surface.shader.set_uniform("v_red", val)
        surface.shader.set_uniform("v_green", val)
        surface.shader.set_uniform("v_blue", val)

        def update_surface(mesh, dt):
            nonlocal increase
            nonlocal val
            if increase:
                val += dt
            else:
                val -= dt
            if val >= 1:
                increase = False
            elif val <= 0:
                increase = True
            surface.shader.set_uniform("v_red", val)
            surface.shader.set_uniform("v_green", val)
            surface.shader.set_uniform("v_blue", val)

        surface.add_updater(update_surface)

        self.add(surface)
        self.wait(5)


class InlineShaderExample(Scene):