Initial independent commit

1 files changed, 34 insertions, 0 deletions

diff --git a/include/engine/utils.h b/include/engine/utils.h
new file mode 100644
index 0000000..65fa35c
--- /dev/null
+++ b/include/engine/utils.h
@@ -0,0 +1,34 @@
+#ifndef ENGINE_UTILS_H
+#define ENGINE_UTILS_H
+
+#include "types.h"
+#include "vector.h"
+
+#define MIN(a,b) ((a < b) ? (a) : (b))
+#define MAX(a,b) ((a > b) ? (a) : (b))
+
+#define MASK_TL (1 << 0)
+#define MASK_T  (1 << 1)
+#define MASK_TR (1 << 2)
+#define MASK_L  (1 << 3)
+#define MASK_C  (1 << 4)
+#define MASK_R  (1 << 5)
+#define MASK_BL (1 << 6)
+#define MASK_B  (1 << 7)
+#define MASK_BR (1 << 8)
+
+/* Linear interpolate */
+f32 lerp(f32 dt, f32 a, f32 b);
+i32 int_lerp(f32 dt, i32 a, i32 b);
+
+/* Hashes */
+u32 hash(char *str);
+
+/* Masks surrounding tiles of a kernel size of 3 */
+/* In reality we only need 9 bits for this, but I think I had a reason for using i32 */
+i32* kernmap(const void *map, i32 *dstmap, const v2_i32 mapsize, bool (*predicate)(const void*));
+
+/* Returns an index from the given weights. */
+i32 pick_from_sample(const i32 *weights, i32 len);
+
+#endif