Force resolution: Variable 800x450 (16:9) 1600x900 (16:9 for big screens) 1920x1080 (for fullscreen testing?)

Other global variables:

uniform vec2 iResolution; // screen size in pixels. note: in Shader Toy this is vec3
uniform float iTime; // time since beginning, in seconds
uniform float iTimeDelta; // time since last frame, in seconds
uniform sampler2D iChannel0; // 2D, 3D or cubemap depending on selected input
// likewise iChannel1, 2, 3

Tabs which don't compile are highlighted red, and the viewport keeps running the last version which compiled.
Sorry for no syntax highlighting!

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Title:
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Your shader as JSON for copy-pasting:
{"inputs":{"fba": ["null","null","null","null"],"fbb":["null","null","null","null"],"fbc": ["null","null","null","null"],"fbd": ["null","null","null","null"],"image": ["null","null","null","null"]},"settings":{"fba": {"coords":"pixel"},"fbb":{"coords":"pixel"},"fbc": {"coords":"pixel"},"fbd":{"coords":"pixel"},"image": {"coords":"pixel"}},"code": {"fba":"","fbb":"","fbc":"","fbd":"","image":"void mainImage(out vec4 color, in vec2 position) {\n\tfloat iMusicEnergy=0.5, iMusicProgress=iTime/4.0; // secret beamer-only variable! uncomment for web browser testing\n\tvec2 uv = (position/iResolution.xy)*2.0-1.0;\n\tuv.y *= iResolution.y/iResolution.x;\n\tvec3 dir = normalize(vec3(uv, 1.0));\n\tfloat startdepth = iMusicProgress*3.14159*5.; // double secret variable\n\tvec3 pos = vec3(0.0, 0.0, startdepth);\n\n\tfloat angle = sin(iMusicProgress*3.14159/2.)*0.3;\n\tmat2 rotation = mat2(vec2(cos(angle),sin(angle)),vec2(-sin(angle),cos(angle))); \n\tdir.xz = rotation*dir.xz;\n\n\tangle = sin(iMusicProgress*3.14159/3.)*0.3;\n\trotation = mat2(vec2(cos(angle),sin(angle)),vec2(-sin(angle),cos(angle))); \n\tdir.yz = rotation*dir.yz;\n\n\tcolor = vec4(0.0);\n\tpos.x += cos(startdepth)*0.4;\n\tpos.y += sin(startdepth)*0.4;\n\tfor(int i = 0; i < 500; i++) {\n\t\tpos += dir*0.1;\n\t\tfloat s = sin(pos.z)*0.5;\n\t\tvec2 middlepos = vec2(cos(pos.z)*0.5, s);\n\t\tif(length(pos.xy - middlepos) > 1.0) {\n\t\t\tcolor.b = (pos.z - startdepth + iMusicEnergy) / 16.0;\n\t\t\tcolor.rg = vec2(s/2.+.5) + (iMusicEnergy-0.3);\n\t\t\tbreak;\n\t\t}\n\t}\n\n\tcolor = floor(color*16.0+0.3)/16.0;\n\tcolor *= 0.5 + iMusicEnergy*0.5;\n}\n","common":""}}

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