Shader cleanup

core/assets/shaders/sun.frag

@@ -0,0 +1,29 @@
+#ifdef GL_ES
+precision mediump float;
+precision lowp int;
+#define INTEGER lowp int
+#else
+#define INTEGER int
+#endif
+
+#define gradients false
+
+const int MAX_COLORS = 10;
+
+uniform INTEGER u_colornum;
+uniform vec4 u_colors[MAX_COLORS];
+
+varying float v_height;
+
+void main() {
+    if(gradients){
+        int from = int(v_height * float(u_colornum));
+        int to = int(clamp(float(int(v_height * float(u_colornum) + 1.0)), 0.0, float(u_colornum)-1.0));
+        float alpha = fract(v_height * float(u_colornum));
+
+        gl_FragColor = vec4(mix(u_colors[from], u_colors[to], alpha));
+    }else{
+        int from = int(v_height * float(u_colornum));
+        gl_FragColor = u_colors[from];
+    }
+}