From b04d5702719eca30a95d1db2a927b6605ebd3477 Mon Sep 17 00:00:00 2001
From: nathansmith117 <nathansmith117@sdf.org>
Date: Mon, 10 Feb 2025 01:12:55 -0700
Subject: Some fast math stuff added

---
 include/libsldj/util.h | 32 +++++++++++++++++++++++++++++++-
 1 file changed, 31 insertions(+), 1 deletion(-)

(limited to 'include/libsldj/util.h')

diff --git a/include/libsldj/util.h b/include/libsldj/util.h
index fd89d1c..2c8dff6 100644
--- a/include/libsldj/util.h
+++ b/include/libsldj/util.h
@@ -1,6 +1,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <stdint.h>
+#include <math.h>
 
 #ifndef UTIL_H
 #define UTIL_H
@@ -11,7 +12,17 @@
 #define TOGGLE_BIT(b, n) (b ^ (0x1 << n))
 #define HAS_FLAG(v, f) ((v & f) == f)
 
-// Just the same color structure as the raylib name.
+// Fast math macros.
+#define SLDJ_SQRT(number) sldjSqrtTable[(uint16_t)(number)]
+
+#define SLDJ_SIN(number) sldjSinTable[(uint16_t)(number)]
+#define SLDJ_COS(number) sldjCosTable[(uint16_t)(number)]
+#define SLDJ_TAN(number) sldjTanTable[(uint16_t)(number)]
+
+#define SLDJ_HYPOT2(x, y) (SLDJ_SQRT(x * x + y * y))
+#define SLDJ_HYPOT3(x, y, z) (SLDJ_SQRT(x * x + y * y + z * z))
+
+// Stuff stolen from raylib/raymath
 #ifndef RL_COLOR_TYPE
 #define RL_COLOR_TYPE
 typedef struct Color {
@@ -22,6 +33,18 @@ typedef struct Color {
 } Color;
 #endif
 
+#ifndef PI
+    #define PI 3.14159265358979323846f
+#endif
+
+#ifndef DEG2RAD
+    #define DEG2RAD (PI/180.0f)
+#endif
+
+#ifndef RAD2DEG
+    #define RAD2DEG (180.0f/PI)
+#endif
+
 // Used for sending information to a scanner.
 typedef struct SldjContext {
     uint16_t viewportWidth;
@@ -31,5 +54,12 @@ typedef struct SldjContext {
     uint16_t yCount;
 } SldjContext;
 
+// Tables.
+extern float sldjSqrtTable[65536];
+
+extern float sldjSinTable[65536];
+extern float sldjCosTable[65536];
+extern float sldjTanTable[65536];
+
 #endif
 
-- 
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