move Z2Calc, c_math and f_op_draw_iter (#125)

* Z2Calc

* port over c_math

* fop_draw_iter

Co-authored-by: Pheenoh <pheenoh@gmail.com>

include/JSystem/JMath/random.h

@@ -3,4 +3,33 @@
 
 #include "dolphin/types.h"
 
+namespace JMath {
+struct TRandom_fast_ {
+    u32 value;
+
+    TRandom_fast_(u32 value);
+    u32 get(void) {
+        value = (value * 0x19660d) + 0x3c6ef35f;
+        return value;
+    }
+
+    u32 get_bit32(void) { return this->get(); }
+
+    // due to the float constant, having this function inlined adds that float to data,
+    // making it not match
+    float get_ufloat_1(void) {
+        // !@bug UB: in C++ it's not legal to read from an union member other
+        // than the last one that was written to.
+        union {
+            f32 f;
+            u32 s;
+        } out;
+        out.s = (this->get() >> 9) | 0x3f800000;
+        return out.f - 1;
+    }
+
+    void setSeed(u32 seed) { value = seed; }
+};
+}  // namespace JMath
+
 #endif /* RANDOM_H */