Example: Shader setup

arcade/experimental/examples/shader_setup.py

@@ -0,0 +1,64 @@
+from PIL import Image
+
+import arcade
+from arcade.gl import geometry
+from arcade.resources import resolve_resource_path
+
+SCREEN_WIDTH = 800
+SCREEN_HEIGHT = 600
+SCREEN_TITLE = "Shader Setup"
+
+
+class ShaderSetup(arcade.Window):
+    """Shader setup"""
+
+    def __init__(self, width, height, title):
+        super().__init__(width, height, title)
+        self.time = 0
+        self.program = self.ctx.program(
+            vertex_shader="""
+            #version 330
+
+            in vec2 in_vert;
+            in vec2 in_uv;
+            out vec2 v_uv;
+
+            void main() {
+                gl_Position = vec4(in_vert, 0.0, 1.0);
+                v_uv = in_uv;
+            }
+            """,
+            fragment_shader="""
+            #version 330
+
+            uniform sampler2D baground;
+            uniform float time;
+
+            in vec2 v_uv;
+            out vec4 out_color;
+
+            void main() {
+                vec2 pos = v_uv * 1.0 - vec2(0.5);
+                vec2 uv = v_uv + normalize(pos) + sin(length(pos) * 10 - time);
+                out_color = texture(baground, uv);
+            }
+            """
+        )
+        self.quad = geometry.screen_rectangle(-1, -1, 2, 2)
+        image = Image.open(resolve_resource_path(":resources:images/backgrounds/abstract_1.jpg")).convert("RGBA")
+        image = image.transpose(Image.FLIP_TOP_BOTTOM)
+        self.texture = self.ctx.texture(image.size, components=4, data=image.tobytes())
+
+    def on_draw(self):
+        self.clear()
+        self.program["time"] = self.time
+        self.texture.use(0)
+        self.quad.render(self.program)
+
+    def on_update(self, dt):
+        self.time += dt
+
+
+if __name__ == "__main__":
+    ShaderSetup(SCREEN_WIDTH, SCREEN_HEIGHT, SCREEN_TITLE)
+    arcade.run()