m(0,2), m(1,2), m(2,2));
return buf;
}
+
+void combine_two_samples(float w1, float w2, float *offset, float *total_weight)
+{
+ assert(w1 * w2 >= 0.0f); // Should not have differing signs.
+ if (fabs(w1 + w2) < 1e-6) {
+ *offset = 0.5f;
+ *total_weight = 0.0f;
+ } else {
+ *offset = w2 / (w1 + w2);
+ *total_weight = w1 + w2;
+ }
+ assert(*offset >= 0.0f);
+ assert(*offset <= 1.0f);
+}