Add sanitizer build option and refactor interpolateLattice kernel

Ensures bit-exact deterministic output

Author: Sunflower Dolls

lib/CMakeLists.txt

@@ -15,10 +15,17 @@ add_library(eedi2metal SHARED
 target_include_directories(eedi2metal PRIVATE ${VAPOURSYNTH_INCLUDE_DIRS})
 option(DUMP_METAL_BUFFERS "Enable dumping of intermediate Metal buffers" OFF)
 
+option(ENABLE_SANITIZERS "Enable sanitizers for detecting possible errors" OFF)
+
 if(DUMP_METAL_BUFFERS)
     target_compile_definitions(eedi2metal PRIVATE DUMP_METAL_BUFFERS)
 endif()
 
+if(ENABLE_SANITIZERS)
+    target_compile_options(eedi2metal PRIVATE -fsanitize=address,undefined -fno-omit-frame-pointer)
+    target_link_options(eedi2metal PRIVATE -fsanitize=address,undefined)
+endif()
+
 set_target_properties(eedi2metal PROPERTIES 
     CXX_FLAGS "-Wno-c23-extensions -mmacosx-version-min=12.0"
     COMPILE_FLAGS "-fobjc-arc"

lib/eedi2_common.metal

@@ -26,6 +26,7 @@ struct EEDI2Param {
     uint estr, dstr, maxd;
     uint subSampling;
     uint shift;
+    uint int_pitch;
 };
 
 constant int limlut[33] = {6,  6,  7,  7,  8,  8,  9,  9,  9,  10, 10,