Translating shaders for processing

###Uniforms have been renamed

uniform sampler2D texture; // iChannel0 in Shadertoy
uniform vec2 sketchSize; // iResolution in Shadertoy

###Main is changed

void mainImage( out vec4 fragColor, in vec2 fragCoord )
// becomes
void main( void )

###Other renaming

// fragCoord and fragColor had to be renamed into
gl_FragCoord 
gl_FragColor

###Y axis adjustment not required

processing coordinates are inverted comment out or remove adjustment as in example glsl fragment

vec2 uv = coords / sketchSize.xy;
  // processing is already using inverted y coordinates
  //	uv.y = 1.0-uv.y; 

###To make the shader compatible with OpenGL ES and WebGL

insert the following at top of shader

#ifdef GL_ES
precision mediump float;
precision mediump int;
#endif

###Other defines for processing shaders

See processing tutorial eg

// This line is optional from Processing 2.1 and up
#define PROCESSING_TEXTURE_SHADER