block3.glsl

// retrieve and decode pixel value from the old tile
vec4 rgbaFloatsA = texture2D(textureA, vTexCoordA);
float pixelFloatValueA = rgbaToFloat(rgbaFloatsA, littleEndian);

// retrieve and decode pixel value from the new tile
vec4 rgbaFloatsB = texture2D(textureB, vTexCoordB);
float pixelFloatValueB = rgbaToFloat(rgbaFloatsB, littleEndian);

// interpolate
float interpolated = mix(pixelFloatValueA, pixelFloatValueB, interpolationFraction);

// compute the color of the interpolated value
gl_FragColor = computeColor(
  interpolated,
  colorScale,
  sentinelValues,
  colorScaleLength,
  sentinelValuesLength
);