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/*
** Lua standard mathematical library
** See Copyright Notice in lua.h
*/
#define FORBIDDEN_SYMBOL_EXCEPTION_rand
#define FORBIDDEN_SYMBOL_EXCEPTION_srand
#include "engines/grim/lua/lauxlib.h"
#include "engines/grim/lua/lua.h"
#include "engines/grim/lua/lualib.h"
namespace Grim {
#ifndef LOCAL_PI
#define LOCAL_PI (3.14159265358979323846)
#endif
#define FROMRAD(a) ((a) * (180.0 / LOCAL_PI))
#define TORAD(a) ((a) * (LOCAL_PI / 180.0))
static void math_abs() {
float d = luaL_check_number(1);
if (d < 0)
d = -d;
lua_pushnumber(d);
}
static void math_sin() {
lua_pushnumber(sin(TORAD(luaL_check_number(1))));
}
static void math_cos() {
lua_pushnumber(cos(TORAD(luaL_check_number(1))));
}
static void math_tan() {
lua_pushnumber(tan(TORAD(luaL_check_number(1))));
}
static void math_asin() {
lua_pushnumber(FROMRAD(asin(luaL_check_number(1))));
}
static void math_acos() {
lua_pushnumber(FROMRAD(acos(luaL_check_number(1))));
}
static void math_atan() {
lua_pushnumber(FROMRAD(atan(luaL_check_number(1))));
}
static void math_ceil() {
lua_pushnumber(ceil(luaL_check_number(1)));
}
static void math_floor() {
lua_pushnumber(floor(luaL_check_number(1)));
}
static void math_mod() {
lua_pushnumber(fmod(luaL_check_number(1), luaL_check_number(2)));
}
static void math_sqrt() {
lua_pushnumber(sqrt(luaL_check_number(1)));
}
static void math_pow() {
lua_pushnumber(pow(luaL_check_number(1), luaL_check_number(2)));
}
static void math_deg() {
lua_pushnumber(luaL_check_number(1) * (180.0/LOCAL_PI));
}
static void math_rad() {
lua_pushnumber(luaL_check_number(1) * (LOCAL_PI / 180.0));
}
static void math_min() {
int32 i = 1;
float dmin = luaL_check_number(i);
while (lua_getparam(++i) != LUA_NOOBJECT) {
float d = luaL_check_number(i);
if (d < dmin)
dmin = d;
}
lua_pushnumber(dmin);
}
static void math_max() {
int32 i = 1;
float dmax = luaL_check_number(i);
while (lua_getparam(++i) != LUA_NOOBJECT) {
float d = luaL_check_number(i);
if (d > dmax)
dmax = d;
}
lua_pushnumber(dmax);
}
static void math_random() {
float r = (float)(rand() % RAND_MAX) / (float)RAND_MAX;
float l = luaL_opt_number(1, 0);
if (l == 0)
lua_pushnumber(r);
else
lua_pushnumber((int32)(r * l) + 1);
}
static void math_randomseed() {
srand((unsigned int)luaL_check_number(1));
}
static struct luaL_reg mathlib[] = {
{ "abs", math_abs},
{ "sin", math_sin},
{ "cos", math_cos},
{ "tan", math_tan},
{ "asin", math_asin},
{ "acos", math_acos},
{ "atan", math_atan},
{ "ceil", math_ceil},
{ "floor", math_floor},
{ "mod", math_mod},
{ "sqrt", math_sqrt},
{ "min", math_min},
{ "max", math_max},
{ "deg", math_deg},
{ "rad", math_rad},
{ "random", math_random},
{ "randomseed", math_randomseed}
};
static luaL_reg powFunc[] = {
{ "math_pow", math_pow }
};
/*
** Open math library
*/
void lua_mathlibopen() {
luaL_openlib(mathlib, (sizeof(mathlib) / sizeof(mathlib[0])));
luaL_addlibtolist(powFunc, (sizeof(powFunc) / sizeof(powFunc[0])));
lua_pushstring("deg");
lua_setglobal("_TRIGMODE");
lua_pushcfunction(math_pow);
lua_pushnumber(0); // to get its tag
lua_settagmethod(lua_tag(lua_pop()), "pow");
lua_pushnumber((float)LOCAL_PI);
lua_setglobal("PI");
}
} // end of namespace Grim
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