carrot/system/camerad/sensors/os04c10_cl.h

#if SENSOR_ID == 3

#define BGGR
#define VIGNETTE_PROFILE_4DT6MM

#define BIT_DEPTH 12
#define PV_MAX10 1023
#define PV_MAX12 4095
#define PV_MAX16 65536 // gamma curve is calibrated to 16bit
#define BLACK_LVL 48

float combine_dual_pvs(float lv, float sv, int expo_time) {
  float svc = fmax(sv * expo_time, (float)(64 * (PV_MAX10 - BLACK_LVL)));
  float svd = sv * fmin(expo_time, 8.0) / 8;

  if (expo_time > 64) {
    if (lv < PV_MAX10 - BLACK_LVL) {
      return lv / (PV_MAX16 - BLACK_LVL);
    } else {
      return (svc / 64) / (PV_MAX16 - BLACK_LVL);
    }
  } else {
    if (lv > 32) {
      return (lv * 64 / fmax(expo_time, 8.0)) / (PV_MAX16 - BLACK_LVL);
    } else {
      return svd / (PV_MAX16 - BLACK_LVL);
    }
  }
}

float4 normalize_pv_hdr(int4 parsed, int4 short_parsed, float vignette_factor, int expo_time) {
  float4 pl = convert_float4(parsed - BLACK_LVL);
  float4 ps = convert_float4(short_parsed - BLACK_LVL);
  float4 pv;
  pv.s0 = combine_dual_pvs(pl.s0, ps.s0, expo_time);
  pv.s1 = combine_dual_pvs(pl.s1, ps.s1, expo_time);
  pv.s2 = combine_dual_pvs(pl.s2, ps.s2, expo_time);
  pv.s3 = combine_dual_pvs(pl.s3, ps.s3, expo_time);
  return clamp(pv*vignette_factor, 0.0, 1.0);
}

float4 normalize_pv(int4 parsed, float vignette_factor) {
  float4 pv = (convert_float4(parsed) - BLACK_LVL) / (PV_MAX12 - BLACK_LVL);
  return clamp(pv*vignette_factor, 0.0, 1.0);
}

float3 color_correct(float3 rgb) {
  float3 corrected = rgb.x * (float3)(1.55361989, -0.268894615, -0.000593219);
  corrected += rgb.y * (float3)(-0.421217301, 1.51883144, -0.69760146);
  corrected += rgb.z * (float3)(-0.132402589, -0.249936825, 1.69819468);
  return corrected;
}

float3 apply_gamma(float3 rgb, int expo_time) {
  return (10 * rgb) / (1 + 9 * rgb);
}

#endif