Add script make_transcendental_tables.py

make_transcendental_tables.py

@@ -0,0 +1,38 @@
+#! /bin/python
+
+# Generates arrays of pre-calculated cosine & arccosine values as literals for C.
+
+from math import acos, cos, pi
+
+def gen_cos_table(f, PRECISION, NAME, math_func):
+    f.write("global_variable f32 %s[] = {\n" % NAME)
+    j = 0
+    p = 0.0
+    while True:
+        f.write("{:.10f}f, ".format(math_func(p)))
+        j += 1
+        if j % 16 == 0:
+            f.write("\n")
+        p += PRECISION
+        if p > 2*pi:
+            break
+    f.write("1.f, 1.f };// NOTE(Jesse): Add a duplicate for the max value so we can blindly add 1 to the lookup index and not overflow (to lerp)\n")
+
+def gen_acos_table(f, PRECISION, NAME, math_func):
+    f.write("global_variable f32 %s[] = {\n" % NAME)
+    j = 0
+    p = -1.0
+    while True:
+        f.write("{:.10f}f, ".format(math_func(p)))
+        j += 1
+        if j % 16 == 0:
+            f.write("\n")
+        p += PRECISION
+        if p > 1.0:
+            break
+    f.write("0.f, 0.f }; // NOTE(Jesse): Add a duplicate for the max value so we can blindly add 1 to the lookup index and not overflow (to lerp)\n")
+
+
+if __name__ == '__main__':
+    gen_cos_table(open("external/bonsai_stdlib/src/costable.h", "w"), 0.0001, "CosineTable", cos)
+    gen_acos_table(open("external/bonsai_stdlib/src/arccostable.h", "w"), 0.0001, "ArcCosineTable", acos)