X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=util.h;h=082d1146a7f4c86c2d935ffeaa62307f6575b884;hb=34f5f331bd3b643949ccbb0c3488af2823634d59;hp=b53bac76ce742367c618e47d1a4578d926bb8cd8;hpb=2c9711e213679e11bea1b0e86bb46af442b22ee0;p=movit

diff --git a/util.h b/util.h
index b53bac7..082d114 100644
--- a/util.h
+++ b/util.h
@@ -34,6 +34,15 @@ void print_3x3_matrix(const Eigen::Matrix3d &m);
 // Output a GLSL 3x3 matrix declaration.
 std::string output_glsl_mat3(const std::string &name, const Eigen::Matrix3d &m);
 
+// Calculate where to sample, and with what weight, if one wants to use
+// the GPU's bilinear hardware to sample w1 * x[0] + w2 * x[1].
+//
+// Note that since the GPU might have limited precision in its linear
+// interpolation, the effective weights might be different from the ones you
+// asked for. sum_sq_error, if not NULL, will contain the sum of the
+// (estimated) squared errors of the two weights.
+void combine_two_samples(float w1, float w2, float *offset, float *total_weight, float *sum_sq_error);
+
 #ifdef NDEBUG
 #define check_error()
 #else