Add resources and references

README.md

@@ -84,3 +84,16 @@ in a texture in another framebuffer) does not work properly. I don't
 understand exactly what's broken, but maybe I'll investigate it more
 closely later. If you have any idea about what went wrong, don't
 hesitate to notify me!
+
+## References and other resources
+
+- [LearnOpenGL](https://learnopengl.com/)
+- [open.gl](https://open.gl/)
+- [docs.gl](http://docs.gl/)
+- [The Book of Shaders](https://thebookofshaders.com/)
+- [glslViewer](https://github.com/patriciogonzalezvivo/glslViewer), a
+  much more complete project with similar aims
+- [Shadertoy](https://www.shadertoy.com/)
+- [smoothstep.io](https://smoothstep.io/)
+- [webgl-noise](https://github.com/stegu/webgl-noise/), a collection
+  of reference implementations of noise functions, for use in shaders

shaders/julia.frag

@@ -49,11 +49,11 @@ float pi = 2.0 * asin(1.0);
 
 void main() {
   // Changes with time
-  // float a = 2.0 * pi * (int(u_frame) % 500) / 500.0;
+  float a = 2.0 * pi * (int(u_frame) % 500) / 500.0;
-  // vec2 c = 0.7885 * vec2(cos(a), sin(a));
+  vec2 c = 0.7885 * vec2(cos(a), sin(a));
 
   // Changes with cursor position
-  vec2 c = u_mouse.xy / u_resolution.xy * 2.0 - vec2(1.0, 1.0);
+  // vec2 c = u_mouse.xy / u_resolution.xy * 2.0 - vec2(1.0, 1.0);
 
   vec2 z = gl_FragCoord.xy / u_resolution.xy * 3.0 - vec2(1.5, 1.5);
   int i = 0;