post-processing test

res/shaders/screen.glslf

@@ -0,0 +1,13 @@
+in vec2 v_coord;
+out vec4 f_color;
+
+uniform sampler2D u_texture0;
+uniform float u_timer;
+
+void main(){
+    vec2 coord = v_coord;
+    coord.x += sin(u_timer*5.0+coord.x*4.0) * 0.02;
+    coord.y += cos(u_timer*5.0+coord.y*4.0) * 0.02;
+	f_color = texture(u_texture0, coord);
+}
+