initial: added basic stuff

basic/sunset.glsl

@@ -0,0 +1,21 @@
+#ifdef GL_ES
+precision mediump float;
+#endif
+
+uniform vec2 u_resolution;
+uniform float u_time;
+
+void main() {
+    vec2 st = gl_FragCoord.xy/u_resolution.xy;
+    vec3 sun = vec3(1.0*abs(sin(u_time)), .0, 0.4*abs(cos(u_time)));
+
+    vec3 pct = vec3(st.x);
+
+    vec3 color = sun;
+    color *= vec3(step(0.4, st.y));
+    if (step(0.4, st.y)<1.0) {
+    	color = sun * vec3(smoothstep(0.2, 0.4, st.y));
+    	color += vec3(0.3,0.2,0.9);
+    }
+    gl_FragColor = vec4(color,1.0);
+}