Use an interpolated FIR filter for cubic resampling

Similar to how the bsinc filters work, but optimized for 4-point filtering. At
least the SSE version is notably faster than calculating the coefficients in
real time.

1 files changed, 16 insertions, 0 deletions

diff --git a/core/cubic_tables.h b/core/cubic_tables.h
new file mode 100644
index 00000000..297aa89e
--- /dev/null
+++ b/core/cubic_tables.h
@@ -0,0 +1,16 @@
+#ifndef CORE_CUBIC_TABLES_H
+#define CORE_CUBIC_TABLES_H
+
+#include "cubic_defs.h"
+
+
+struct CubicTable {
+    const CubicCoefficients *Tab;
+};
+
+/* A Catmull-Rom spline. The spline passes through the center two samples,
+ * ensuring no discontinuity while moving through a series of samples.
+ */
+extern const CubicTable gCubicSpline;
+
+#endif /* CORE_CUBIC_TABLES_H */