// Last sample; cannot combine.
continue;
}
+ assert(num_samples_saved <= max_samples_saved);
if (num_samples_saved == max_samples_saved) {
// We could maybe save more here, but other rows can't, so don't bother.
continue;
float pos2 = src[(i + 1) * 2 + 1];
assert(pos2 > pos1);
- float offset, total_weight;
- combine_two_samples(w1, w2, &offset, &total_weight);
+ float offset, total_weight, sum_sq_error;
+ combine_two_samples(w1, w2, &offset, &total_weight, &sum_sq_error);
+
+ // If the interpolation error is larger than that of one level
+ // at 8-bit precision, don't combine.
+ if (sum_sq_error > 1.0f / (256.0f * 256.0f)) {
+ continue;
+ }
// OK, we can combine this and the next sample.
if (dst != NULL) {
check_error();
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
check_error();
- glTexImage2D(GL_TEXTURE_2D, 0, GL_RG32F, src_bilinear_samples, dst_samples, 0, GL_RG, GL_FLOAT, bilinear_weights);
+ glTexImage2D(GL_TEXTURE_2D, 0, GL_RG16F, src_bilinear_samples, dst_samples, 0, GL_RG, GL_FLOAT, bilinear_weights);
check_error();
delete[] weights;