X-Git-Url: https://git.sesse.net/?p=movit;a=blobdiff_plain;f=resample_effect.cpp;h=10dc59c5a2dbab0a0533629b801357636ad31ef0;hp=6c490f141bc1a87b9f86db44b90b5d64f75d0dd7;hb=aa3e630eb0c455921c721f9ccd84e872bc9757bc;hpb=2b6a8585772bf9ae742a2ee36144a0cdd5ba0524

diff --git a/resample_effect.cpp b/resample_effect.cpp
index 6c490f1..10dc59c 100644
--- a/resample_effect.cpp
+++ b/resample_effect.cpp
@@ -299,11 +299,18 @@ void SingleResamplePassEffect::update_texture(GLuint glsl_program_num, const str
 		int base_src_y = lrintf(center_src_y);
 
 		// Now sample <int_radius> pixels on each side around that point.
+		double sum = 0.0;
 		for (int i = 0; i < src_samples; ++i) {
 			int src_y = base_src_y + i - int_radius;
 			float weight = lanczos_weight(radius_scaling_factor * (src_y - center_src_y), LANCZOS_RADIUS);
 			weights[(y * src_samples + i) * 2 + 0] = weight * radius_scaling_factor;
 			weights[(y * src_samples + i) * 2 + 1] = (src_y + 0.5) / float(src_size);
+			sum += weights[(y * src_samples + i) * 2 + 0];
+		}
+
+		// Normalize so that the sum becomes one.
+		for (int i = 0; i < src_samples; ++i) {
+			weights[(y * src_samples + i) * 2 + 0] /= sum;
 		}
 	}