message: alpha-orbitals: webgl1 support
diff: @@ -117,7 +117,14 @@ float L4(vec3 p, float a0, float a1, float a2, float a3, float a4, float a5, flo
  }
  float alpha(float offset, float f) {
  + #ifdef uMaxCoeffs
  + // in webgl1, the value is in the alpha channel!
  + return texture2D(tAlpha, vec2(offset * f, 0.5)).a;
  + #endif
  +
  + #ifndef uMaxCoeffs
  return texture2D(tAlpha, vec2(offset * f, 0.5)).x;
  + #endif
  }
  float Y(int L, vec3 X, float aO, float fA) {
  @@ -165,8 +172,8 @@ float Y(int L, vec3 X, float aO, float fA) {
  if (o >= end) break;
  vec2 c = texture2D(tCoeff, vec2(float(o) * fCoeff, 0.5)).xy;
  - o++;
  gauss += c.x * exp(-c.y * R2);
  + o++;
  }
  return gauss;
  }
  @@ -176,7 +183,7 @@ float intDiv(float a, float b) { return float(int(a) / int(b)); }
  float intMod(float a, float b) { return a - b * float(int(a) / int(b)); }
  void main(void) {
  - float offset = round(floor(gl_FragCoord.x) + floor(gl_FragCoord.y) * uWidth);
  + float offset = floor(gl_FragCoord.x) + floor(gl_FragCoord.y) * uWidth;
  // axis order fast to slow Z, Y, X
  // TODO: support arbitrary axis orders?
  @@ -190,6 +197,9 @@ void main(void) {
  float fCoeff = 1.0 / float(uNCoeff - 1);
  float fA = 1.0 / float(uNAlpha - 1);
  + // gl_FragColor = floatToRgba(offset);
  + // return;
  +
  float v = 0.0;
  for (int i = 0; i < uNCenters; i++) {
  @@ -200,9 +210,9 @@ void main(void) {
  float R2 = dot(X, X);
  // center.w is squared cutoff radius
  - if (R2 > center.w) {
  - continue;
  - }
  + // if (R2 > center.w) {
  + // continue;
  + // }
  vec4 info = texture2D(tInfo, cCoord);
  