Shadertoy compatibility for GLSLSandox

shadertoy2glslsandox.frag

#ifdef GL_ES
precision mediump float;
#endif

// glslsandbox uniforms
uniform float time;
uniform vec2 resolution;
uniform vec2 mouse;

// shadertoy globals
#define iTime time
#define iResolution vec3(resolution, 0.0)
#define iMouse vec4(mouse, 0.0, 0.0)

void mainImage (out vec4 fragColor, in vec2 fragCoord);
void main(void) {
    mainImage(gl_FragColor, gl_FragCoord.xy);
}

/*
 * Original shader from: https://www.shadertoy.com/view/XlcfzS
 */

Just copy paste this code in glslsanbox.com then copy paste the Shadertoy code after.