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:
Ready to publish - uncheck this if your unfinished shader shouldn't be seen by anyone else yet
Consent to release this in a zip file at the end of bornhack (only if public)
Title will be displayed alongside this shader. Include your name if you want to.
Save (on server)

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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":"#define PI 3.1415925359\n#define TWO_PI 6.2831852\n#define MAX_STEPS 200\n#define MAX_DIST 100.\n#define SURFACE_DIST 0.001\n#define EPSILON 0.01\n \nfloat sphere_sdf(vec3 point, float size)\n{\n return length(point) - size;\n}\n\nfloat torus_sdf(vec3 point, float size, float width)\n{\n\n vec2 q = vec2(length(point.xy)-size + width,point.z);\n return length(q)-width;\n}\n\nfloat box_sdf( vec3 point, vec3 size )\n{\n vec3 dist = abs(point) - size;\n return min(max(dist.x,max(dist.y,dist.z)),0.0) + length(max(dist,0.0));\n}\n\nvec3 rotate_sdf(vec3 point, float offset, float speed, float time) {\n float sin_time = sin(time * PI*2.0 * speed + offset);\n float cos_time = cos(time * PI*2.0 * speed + offset);\n float camera_x = point.x * cos_time - point.z * sin_time;\n float camera_z = point.x * sin_time + point.z * cos_time;\n return vec3(camera_x, point.y, camera_z);\n}\n\nvec3 rotate_horizontal_sdf(vec3 point, float offset, float speed, float time) {\n float sin_time = sin(time * PI*2.0 * speed + offset);\n float cos_time = cos(time * PI*2.0 * speed + offset);\n float camera_y = point.y * cos_time - point.z * sin_time;\n float camera_z = point.y * sin_time + point.z * cos_time;\n return vec3(point.x, camera_y, camera_z);\n}\n\nvec3 move_sdf(vec3 point, float speed, float time) {\n float camera_x = point.x + cos(time * PI*2.0 * speed);\n\n return vec3(camera_x, point.y, point.z);\n}\n\n\nfloat scene_sdf(vec3 point, float time) {\n \n //float sphere = sphere_sdf(point - vec3(0.0, 1.0, 3.0) , 1.0);\n //float box = box_sdf(\n // rotate_sdf(point - vec3(0.0, 1.0, 3.0), 0.0, 0.2, time)\n //, vec3(0.75, 0.75, 0.75));\n //float cutout = sphere_sdf(\n // rotate_sdf(point - vec3(0.0, 1.0, 3.0), 0.0, 0.1, time) - vec3(0.5, 0.0, 0.0)\n //, 0.5);\n \n float surface = MAX_DIST;\n for(int i = 0; i < 8; i++) {\n float donut = torus_sdf(\n rotate_sdf(rotate_horizontal_sdf(point - vec3(0.0, 1.0, 3.0), 0.0, 0.02 * float(i), time), PI/2.0, 0.25, time)\n , 0.15 * float(i), 0.05);\n surface = min(surface, donut);\n }\n \n //return min(max(box, cutout * -1.), min(donut1, donut2));\n //return max(surface, cutout * -1.);\n return surface;\n}\n\nvec3 estimate_normal(vec3 p, float time) {\n return normalize(vec3(\n scene_sdf(vec3(p.x + EPSILON, p.y, p.z), time) - scene_sdf(vec3(p.x - EPSILON, p.y, p.z), time),\n scene_sdf(vec3(p.x, p.y + EPSILON, p.z), time) - scene_sdf(vec3(p.x, p.y - EPSILON, p.z), time),\n scene_sdf(vec3(p.x, p.y, p.z + EPSILON), time) - scene_sdf(vec3(p.x, p.y, p.z - EPSILON), time)\n ));\n}\n \nvec3 march(vec3 origin, vec3 direction, float time) \n{\n float start = 0.;\n for(int i=0;i<MAX_STEPS;i++)\n {\n vec3 point = origin + direction * start;\n float dist = scene_sdf(point, time);\n start += dist;\n \n if(dist < SURFACE_DIST) {\n return estimate_normal(point, time);\n }\n \n if(start > MAX_DIST) break;\n }\n return vec3(start);\n}\n \n\nvoid mainImage(out vec4 fragColor, in vec2 fragCoord)\n{\n float iMusicEnergy = exp(0.1*-mod(iTime*2.0,1.0));// added by immibis for final .zip export. This secret uniform only existed in the C version with the audio stream input.\n vec2 uv = (fragCoord.xy-.5*iResolution.xy)/iResolution.y;\n float zoom = max(2.0, 8.0 - (iMusicEnergy * 5.0));\n\n vec2 backgroundUv = uv;\n uv = uv * zoom;\n uv = fract(uv-0.5)-0.5;\n \n vec3 origin = vec3(0,1,0);\n vec3 direction = normalize(vec3(uv.x,uv.y,1));\n \n vec2 timeUv = abs(floor((backgroundUv * zoom) + 0.5));\n timeUv = vec2(length(timeUv) / 10.);\n \n float time = ((iTime + 890.0) + timeUv.x + timeUv.y + timeUv.y) * (timeUv.x * 0.1) + iTime;\n vec3 norm = march(origin,direction, time);\n \n float level = (norm.x + norm.y) / 3.0 + 0.5;\n float mask = (step(1.0, level) * -1.0 + 1.0);\n \n vec3 foregound = (0.2 + 0.3 * cos(time + backgroundUv.xyx+vec3(0,2,4))) + vec3(level);\n vec3 background = (0.5 + 0.5 * cos(iTime + backgroundUv.xyx+vec3(0,2,4)));\n vec3 col = (foregound * vec3(level) * mask) + (background * (mask * -1.0 + 1.0));\n \n \n fragColor = vec4(col * (length(backgroundUv) * -1.0 + 1.0) , 1.0);\n //fragColor = vec4(timeUv, 1.0 , 1.0);\n}\n","common":""}}

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