From c6506a9afab81c6d86fe62122d6c8aaa1ae989d8 Mon Sep 17 00:00:00 2001
From: Leonard Francis Coogan <leocoogan@mailfence.com>
Date: Tue, 14 Oct 2025 23:26:30 -0400
Subject: [PATCH] body segmentation opaque working

---
 body_segmentation.js | 153 +++++++++++++++++++++++++++++++++++++++++++
 hegel.frag           |  33 ++++++++++
 2 files changed, 186 insertions(+)
 create mode 100644 body_segmentation.js
 create mode 100644 hegel.frag

diff --git a/body_segmentation.js b/body_segmentation.js
new file mode 100644
index 0000000..00a1781
--- /dev/null
+++ b/body_segmentation.js
@@ -0,0 +1,153 @@
+p5.disableFriendlyErrors = true;
+
+let cam, segmenter, seg = null, maskGfx, sh;
+const W = 640, H = 480;
+
+const VERT = `
+precision mediump float;
+attribute vec3 aPosition;
+attribute vec2 aTexCoord;
+varying vec2 vUv;
+void main(){
+  vUv = aTexCoord;
+  vec4 pos = vec4(aPosition, 1.0);
+  pos.xy = pos.xy * 2.0 - 1.0;
+  gl_Position = pos;
+}
+`;
+
+const FRAG = `
+precision mediump float;
+
+uniform vec2  uResolution;
+uniform float uTime;
+uniform sampler2D uVideo;
+uniform sampler2D uMask;
+uniform float uHasMask;
+
+varying vec2 vUv;
+
+vec4 tex2D(sampler2D s, vec2 uv){
+  return texture2D(s, vec2(uv.x, 1.0 - uv.y));
+}
+
+vec3 bg(vec2 uv){
+  vec2 p = uv - 0.5;
+  float r = length(p);
+  vec3 a = 0.6 + 0.4 * cos(6.28318 * (r + vec3(0.0, 0.15, 0.33) + 0.03 * uTime));
+  return a;
+}
+
+float maskPresent(vec2 uv){
+  vec4 c = tex2D(uMask, uv);
+  return step(0.001, c.a + c.r + c.g + c.b);
+}
+
+float edgeStrength(vec2 uv){
+  vec2 px = 1.0 / uResolution;
+  float m = maskPresent(uv);
+  float neigh = (
+    maskPresent(uv + vec2( px.x, 0.0)) +
+    maskPresent(uv + vec2(-px.x, 0.0)) +
+    maskPresent(uv + vec2(0.0,  px.y)) +
+    maskPresent(uv + vec2(0.0, -px.y))
+  ) * 0.25;
+  return max(0.0, m - neigh);
+}
+
+/*
+vec3 partsTint(float id){
+  return 0.6 + 0.4 * cos(6.28318 * (id * 0.07 + vec3(0.0, 0.15, 0.33)));
+}
+*/
+
+
+
+vec3 partsTint(float id){
+  return 0.3 + 0.7 * cos(6.28318 * (id * 0.07 + vec3(0.0, 0.15, 0.33)));
+}
+
+
+void main(){
+  vec2 uv = vUv;
+
+  vec4 vid = tex2D(uVideo, uv);
+  vec4 msk = tex2D(uMask,  uv);
+
+  float present = (uHasMask > 0.5 ? 1.0 : 0.0) * maskPresent(uv);
+  float id = msk.r * 255.0;
+  vec3 tint = partsTint(id);
+
+// vec3 tint = vec3(0.1, 1.0, 0.0);
+
+  vec3 base = mix(bg(uv), vid.rgb * 0.7, 0.7);
+  vec3 body = vid.rgb * tint; // * mix(vec3(1.0), tint, 0.55);
+
+  float edge = smoothstep(0.0, 0.8, edgeStrength(uv)) * 0.8;
+
+  vec3 col = mix(base, body, present);
+  col += edge * vec3(1.1, 0.9, 1.2);
+
+  gl_FragColor = vec4(col, 1.0);
+}
+`;
+
+async function setup(){
+  createCanvas(W, H, WEBGL);
+  pixelDensity(1);
+  noStroke();
+
+  cam = createCapture({ video:{ width:W, height:H, facingMode:'user' }, audio:false });
+  cam.size(W, H);
+  cam.elt.setAttribute('playsinline','');
+  cam.hide();
+  await new Promise(res => (cam.elt.readyState >= 2 ? res() : (cam.elt.onloadeddata = res)));
+
+  window.video = cam;
+
+  if (window.tf && tf.setBackend) {
+    if (tf.getBackend && tf.getBackend() !== 'webgl') {
+      await tf.setBackend('webgl');
+    }
+    await tf.ready();
+  }
+
+  sh = createShader(VERT, FRAG);
+  maskGfx = createGraphics(W, H);
+  maskGfx.pixelDensity(1);
+
+  segmenter = await ml5.bodySegmentation('BodyPix', { maskType: 'parts' });
+
+  if (segmenter.ready && typeof segmenter.ready.then === 'function') {
+    await segmenter.ready;
+  } else {
+    await new Promise((res) => {
+      let n = 0;
+      const t = setInterval(() => {
+        if (segmenter.segmenter) { clearInterval(t); res(); }
+        else if ((n += 1) > 400) { clearInterval(t); res(); }
+      }, 25);
+    });
+  }
+
+  segmenter.detectStart(cam, r => { seg = r; });
+}
+
+function draw(){
+  if (seg && seg.mask){
+    maskGfx.clear();
+    maskGfx.image(seg.mask, 0, 0, maskGfx.width, maskGfx.height);
+  } else {
+    maskGfx.clear();
+  }
+
+  shader(sh);
+  sh.setUniform('uResolution', [width, height]);
+  sh.setUniform('uTime', millis()/1000.0);
+  sh.setUniform('uVideo', cam);
+  sh.setUniform('uMask',  maskGfx);
+  sh.setUniform('uHasMask', (seg && seg.mask) ? 1.0 : 0.0);
+
+  rect(-width/2, -height/2, width, height);
+}
+
diff --git a/hegel.frag b/hegel.frag
new file mode 100644
index 0000000..ff2b384
--- /dev/null
+++ b/hegel.frag
@@ -0,0 +1,33 @@
+#ifdef GL_ES
+precision mediump float;
+#endif
+
+uniform vec2 u_resolution;
+uniform vec2 u_mouse;
+uniform float u_time;
+
+
+
+
+void main() {
+  vec2 st = gl_FragCoord.xy/u_resolution.xy;
+  vec3 color = vec3(0.5);
+
+  // st *= 1. + u_mouse * sin(0.0001 + u_time );
+  
+  st *= 1.;
+
+  color.rb = vec2(0.1 + st);
+  // color.rg = vec2(0.8);
+  
+  /*
+  color.r = 0.1;
+  color.g = 0.5;
+  color.b = 0.1;
+  */
+
+
+
+  gl_FragColor = vec4(color,0.9);
+}
+