Kivy Blueprints

Using custom shaders in Kivy

Apart from GLSL, we also need to have the usual Python code that initializes the window, loads shaders, and so on. The following program will serve as a good starting point:

from kivy.app import App
from kivy.base import EventLoop
from kivy.graphics import Mesh
from kivy.graphics.instructions import RenderContext
from kivy.uix.widget import Widget

class GlslDemo(Widget):
    def __init__(self, **kwargs):
        Widget.__init__(self, **kwargs)
        self.canvas = RenderContext(use_parent_projection=True)
        self.canvas.shader.source = 'basic.glsl'
        # Set up geometry here.

class GlslApp(App):
    def build(self):
        EventLoop.ensure_window()
        return GlslDemo()

if __name__ == '__main__':
    GlslApp().run()

We created just one widget named GlslDemo in ...