ShaderToy

Let people to learn shader of opengl es GLSL in IOS ,with object-c

Also you can refer the fork from this here :

https://github.com/ralph-e-boy/shadertoy

you can use this code freely .

to test if github can support latex

When $a \ne 0$, there are two solutions to $(ax^2 + bx + c = 0)$ and they are

$$ x = {-b \pm \sqrt{b^2-4ac} \over 2a} $$ $$ \lim_{n}\to{infty} $$

$$\left( \sum_{k=1}^n a_k b_k \right)^2 \leq \left( \sum_{k=1}^n a_k^2 \right) \left( \sum_{k=1}^n b_k^2 \right)$$

$$\sqrt(a) \cos (2\theta) = \cos^2 \theta - \sin^2 \theta (sum_{k=1}^n a_k b_k)^2$$

graph TD;
    A-->B;
    A-->C;
    B-->D;
    C-->D;

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