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/**
* Copyright (c) 2006-2014 LOVE Development Team
*
* This software is provided 'as-is', without any express or implied
* warranty. In no event will the authors be held liable for any damages
* arising from the use of this software.
*
* Permission is granted to anyone to use this software for any purpose,
* including commercial applications, and to alter it and redistribute it
* freely, subject to the following restrictions:
*
* 1. The origin of this software must not be misrepresented; you must not
* claim that you wrote the original software. If you use this software
* in a product, an acknowledgment in the product documentation would be
* appreciated but is not required.
* 2. Altered source versions must be plainly marked as such, and must not be
* misrepresented as being the original software.
* 3. This notice may not be removed or altered from any source distribution.
**/
#include "config.h"
#include "runtime.h"
// LOVE
#include "Module.h"
#include "Object.h"
#include "Reference.h"
#include "StringMap.h"
#include <thread/threads.h>
// C++
#include <algorithm>
#include <iostream>
#include <cstdio>
namespace love
{
static thread::Mutex *gcmutex = 0;
void *_gcmutex = 0;
/**
* Called when an object is collected. The object is released
* once in this function, possibly deleting it.
**/
static int w__gc(lua_State *L)
{
if (!gcmutex)
{
gcmutex = thread::newMutex();
_gcmutex = (void *) gcmutex;
}
Proxy *p = (Proxy *)lua_touserdata(L, 1);
Object *t = (Object *)p->data;
thread::Lock lock(gcmutex);
int numretains = p->retains;
if (numretains >= 0)
numretains = std::min(numretains, t->getReferenceCount());
for (int i = numretains; i > 0; i--)
t->release();
// Signal that this Proxy is dead.
p->retains = -1;
return 0;
}
static int w__tostring(lua_State *L)
{
lua_pushvalue(L, lua_upvalueindex(1));
return 1;
}
static int w__typeOf(lua_State *L)
{
Proxy *p = (Proxy *)lua_touserdata(L, 1);
Type t = luax_type(L, 2);
luax_pushboolean(L, p->flags[t]);
return 1;
}
static int w__eq(lua_State *L)
{
Proxy *p1 = (Proxy *)lua_touserdata(L, 1);
Proxy *p2 = (Proxy *)lua_touserdata(L, 2);
luax_pushboolean(L, p1->data == p2->data);
return 1;
}
Reference *luax_refif(lua_State *L, int type)
{
Reference *r = 0;
// Create a reference only if the test succeeds.
if (lua_type(L, -1) == type)
r = new Reference(L);
else // Pop the value even if it fails (but also if it succeeds).
lua_pop(L, 1);
return r;
}
void luax_printstack(lua_State *L)
{
for (int i = 1; i<=lua_gettop(L); i++)
{
std::cout << i << " - " << luaL_typename(L, i) << std::endl;
}
}
bool luax_toboolean(lua_State *L, int idx)
{
return (lua_toboolean(L, idx) != 0);
}
void luax_pushboolean(lua_State *L, bool b)
{
lua_pushboolean(L, b ? 1 : 0);
}
bool luax_optboolean(lua_State *L, int idx, bool b)
{
if (lua_isboolean(L, idx) == 1)
return (lua_toboolean(L, idx) == 1 ? true : false);
return b;
}
std::string luax_tostring(lua_State *L, int idx)
{
size_t len;
const char *str = lua_tolstring(L, idx, &len);
return std::string(str, len);
}
std::string luax_checkstring(lua_State *L, int idx)
{
size_t len;
const char *str = luaL_checklstring(L, idx, &len);
return std::string(str, len);
}
void luax_pushstring(lua_State *L, const std::string &str)
{
lua_pushlstring(L, str.data(), str.size());
}
bool luax_boolflag(lua_State *L, int table_index, const char *key, bool defaultValue)
{
lua_getfield(L, table_index, key);
bool retval;
if (lua_isnoneornil(L, -1))
retval = defaultValue;
else
retval = lua_toboolean(L, -1);
lua_pop(L, 1);
return retval;
}
int luax_intflag(lua_State *L, int table_index, const char *key, int defaultValue)
{
lua_getfield(L, table_index, key);
int retval;
if (!lua_isnumber(L, -1))
retval = defaultValue;
else
retval = (int) lua_tointeger(L, -1);
lua_pop(L, 1);
return retval;
}
int luax_assert_argc(lua_State *L, int min)
{
int argc = lua_gettop(L);
if (argc < min)
return luaL_error(L, "Incorrect number of arguments. Got [%d], expected at least [%d]", argc, min);
return 0;
}
int luax_assert_argc(lua_State *L, int min, int max)
{
int argc = lua_gettop(L);
if (argc < min || argc > max)
return luaL_error(L, "Incorrect number of arguments. Got [%d], expected [%d-%d]", argc, min, max);
return 0;
}
int luax_assert_function(lua_State *L, int idx)
{
if (!lua_isfunction(L, idx))
return luaL_error(L, "Argument must be of type \"function\".");
return 0;
}
int luax_assert_nilerror(lua_State *L, int idx)
{
if (lua_isnoneornil(L, idx))
{
if (lua_isstring(L, idx + 1))
return luaL_error(L, lua_tostring(L, idx + 1));
else
return luaL_error(L, "assertion failed!");
}
return 0;
}
void luax_setfuncs(lua_State *L, const luaL_Reg *l)
{
if (l == 0)
return;
for (; l->name != 0; l++)
{
lua_pushcfunction(L, l->func);
lua_setfield(L, -2, l->name);
}
}
int luax_register_module(lua_State *L, const WrappedModule &m)
{
// Put a reference to the C++ module in Lua.
luax_insistregistry(L, REGISTRY_MODULES);
Proxy *p = (Proxy *)lua_newuserdata(L, sizeof(Proxy));
p->retains = 1;
p->data = m.module;
p->flags = m.flags;
luaL_newmetatable(L, m.module->getName());
lua_pushvalue(L, -1);
lua_setfield(L, -2, "__index");
lua_pushcfunction(L, w__gc);
lua_setfield(L, -2, "__gc");
lua_setmetatable(L, -2);
lua_setfield(L, -2, m.name); // _modules[name] = proxy
lua_pop(L, 1);
// Gets the love table.
luax_insistglobal(L, "love");
// Create new table for module.
lua_newtable(L);
// Register all the functions.
if (m.functions != 0)
luax_setfuncs(L, m.functions);
// Register types.
if (m.types != 0)
for (const lua_CFunction *t = m.types; *t != 0; t++)
(*t)(L);
lua_pushvalue(L, -1);
lua_setfield(L, -3, m.name); // love.graphics = table
lua_remove(L, -2); // love
// Register module instance
Module::registerInstance(m.module);
return 1;
}
int luax_preload(lua_State *L, lua_CFunction f, const char *name)
{
lua_getglobal(L, "package");
lua_getfield(L, -1, "preload");
lua_pushcfunction(L, f);
lua_setfield(L, -2, name);
lua_pop(L, 2);
return 0;
}
int luax_register_type(lua_State *L, const char *tname, const luaL_Reg *f)
{
// Verify that this type name has a matching Type ID and type name mapping.
love::Type ltype;
if (!love::getType(tname, ltype))
printf("Missing type entry for type name: %s\n", tname);
// Get the place for storing and re-using instantiated love types.
luax_getregistry(L, REGISTRY_TYPES);
// Create registry._lovetypes if it doesn't exist yet.
if (!lua_istable(L, -1))
{
lua_newtable(L);
lua_replace(L, -2);
// Create a metatable.
lua_newtable(L);
// metatable.__mode = "v". Weak userdata values.
lua_pushliteral(L, "v");
lua_setfield(L, -2, "__mode");
// setmetatable(newtable, metatable)
lua_setmetatable(L, -2);
// registry._lovetypes = newtable
lua_setfield(L, LUA_REGISTRYINDEX, "_lovetypes");
}
else
lua_pop(L, 1);
luaL_newmetatable(L, tname);
// m.__index = m
lua_pushvalue(L, -1);
lua_setfield(L, -2, "__index");
// setup gc
lua_pushcfunction(L, w__gc);
lua_setfield(L, -2, "__gc");
// Add equality
lua_pushcfunction(L, w__eq);
lua_setfield(L, -2, "__eq");
// Add tostring function.
lua_pushstring(L, tname);
lua_pushcclosure(L, w__tostring, 1);
lua_setfield(L, -2, "__tostring");
// Add tostring to as type() as well.
lua_pushstring(L, tname);
lua_pushcclosure(L, w__tostring, 1);
lua_setfield(L, -2, "type");
// Add typeOf
lua_pushcfunction(L, w__typeOf);
lua_setfield(L, -2, "typeOf");
if (f != 0)
luax_setfuncs(L, f);
lua_pop(L, 1); // Pops metatable.
return 0;
}
int luax_table_insert(lua_State *L, int tindex, int vindex, int pos)
{
if (tindex < 0)
tindex = lua_gettop(L)+1+tindex;
if (vindex < 0)
vindex = lua_gettop(L)+1+vindex;
if (pos == -1)
{
lua_pushvalue(L, vindex);
lua_rawseti(L, tindex, lua_objlen(L, tindex)+1);
return 0;
}
else if (pos < 0)
pos = lua_objlen(L, tindex)+1+pos;
for (int i = lua_objlen(L, tindex)+1; i > pos; i--)
{
lua_rawgeti(L, tindex, i-1);
lua_rawseti(L, tindex, i);
}
lua_pushvalue(L, vindex);
lua_rawseti(L, tindex, pos);
return 0;
}
int luax_register_searcher(lua_State *L, lua_CFunction f, int pos)
{
// Add the package loader to the package.loaders table.
lua_getglobal(L, "package");
if (lua_isnil(L, -1))
return luaL_error(L, "Can't register searcher: package table does not exist.");
lua_getfield(L, -1, "loaders");
// Lua 5.2 renamed package.loaders to package.searchers.
if (lua_isnil(L, -1))
{
lua_pop(L, 1);
lua_getfield(L, -1, "searchers");
}
if (lua_isnil(L, -1))
return luaL_error(L, "Can't register searcher: package.loaders table does not exist.");
lua_pushcfunction(L, f);
luax_table_insert(L, -2, -1, pos);
lua_pop(L, 3);
return 0;
}
void luax_rawnewtype(lua_State *L, const char *name, bits flags, love::Object *data, bool own)
{
Proxy *u = (Proxy *)lua_newuserdata(L, sizeof(Proxy));
u->data = (void *) data;
u->flags = flags;
u->retains = own ? 1 : 0;
luaL_newmetatable(L, name);
lua_setmetatable(L, -2);
}
void luax_pushtype(lua_State *L, const char *name, bits flags, love::Object *data, bool own)
{
// Fetch the registry table of instantiated types.
luax_getregistry(L, REGISTRY_TYPES);
// The table might not exist - it should be insisted in luax_register_type.
if (!lua_istable(L, -1))
{
lua_pop(L, 1);
return luax_rawnewtype(L, name, flags, data, own);
}
// Get the value of lovetypes[data] on the stack.
lua_pushlightuserdata(L, (void *) data);
lua_gettable(L, -2);
// If the Proxy userdata isn't in the instantiated types table yet, add it.
if (lua_type(L, -1) != LUA_TUSERDATA)
{
lua_pop(L, 1);
luax_rawnewtype(L, name, flags, data, own);
lua_pushlightuserdata(L, (void *) data);
lua_pushvalue(L, -2);
// lovetypes[data] = Proxy.
lua_settable(L, -4);
// Remove the lovetypes table from the stack.
lua_remove(L, -2);
// The Proxy userdata remains at the top of the stack.
return;
}
// Remove the lovetypes table from the stack.
lua_remove(L, -2);
// If the object should be released on GC and we already have a stored
// Proxy, we should tell the Proxy that the object was retained again.
if (own)
{
Proxy *p = (Proxy *) lua_touserdata(L, -1);
thread::EmptyLock lock;
if (gcmutex)
lock.setLock(gcmutex);
if (p->retains >= 0)
++(p->retains);
}
// Keep the Proxy userdata on the stack.
}
bool luax_istype(lua_State *L, int idx, love::bits type)
{
if (lua_type(L, idx) != LUA_TUSERDATA)
return false;
return ((((Proxy *)lua_touserdata(L, idx))->flags & type) == type);
}
int luax_getfunction(lua_State *L, const char *mod, const char *fn)
{
lua_getglobal(L, "love");
if (lua_isnil(L, -1)) return luaL_error(L, "Could not find global love!");
lua_getfield(L, -1, mod);
if (lua_isnil(L, -1)) return luaL_error(L, "Could not find love.%s!", mod);
lua_getfield(L, -1, fn);
if (lua_isnil(L, -1)) return luaL_error(L, "Could not find love.%s.%s!", mod, fn);
lua_remove(L, -2); // remove mod
lua_remove(L, -2); // remove fn
return 0;
}
int luax_convobj(lua_State *L, int idx, const char *mod, const char *fn)
{
// Convert string to a file.
luax_getfunction(L, mod, fn);
lua_pushvalue(L, idx); // The initial argument.
lua_call(L, 1, 2); // Call the function, one arg, one return value (plus optional errstring.)
luax_assert_nilerror(L, -2); // Make sure the function returned something.
lua_pop(L, 1); // Pop the second return value now that we don't need it.
lua_replace(L, idx); // Replace the initial argument with the new object.
return 0;
}
int luax_convobj(lua_State *L, int idxs[], int n, const char *mod, const char *fn)
{
luax_getfunction(L, mod, fn);
for (int i = 0; i < n; i++)
{
lua_pushvalue(L, idxs[i]); // The arguments.
}
lua_call(L, n, 2); // Call the function, n args, one return value (plus optional errstring.)
luax_assert_nilerror(L, -2); // Make sure the function returned something.
lua_pop(L, 1); // Pop the second return value now that we don't need it.
lua_replace(L, idxs[0]); // Replace the initial argument with the new object.
return 0;
}
int luax_pconvobj(lua_State *L, int idx, const char *mod, const char *fn)
{
// Convert string to a file.
luax_getfunction(L, mod, fn);
lua_pushvalue(L, idx); // The initial argument.
int ret = lua_pcall(L, 1, 1, 0); // Call the function, one arg, one return value.
if (ret == 0)
lua_replace(L, idx); // Replace the initial argument with the new object.
return ret;
}
int luax_pconvobj(lua_State *L, int idxs[], int n, const char *mod, const char *fn)
{
luax_getfunction(L, mod, fn);
for (int i = 0; i < n; i++)
{
lua_pushvalue(L, idxs[i]); // The arguments.
}
int ret = lua_pcall(L, n, 1, 0); // Call the function, n args, one return value.
if (ret == 0)
lua_replace(L, idxs[0]); // Replace the initial argument with the new object.
return ret;
}
int luax_insist(lua_State *L, int idx, const char *k)
{
// Convert to absolute index if necessary.
if (idx < 0 && idx > LUA_REGISTRYINDEX)
idx = lua_gettop(L) + ++idx;
lua_getfield(L, idx, k);
// Create if necessary.
if (!lua_istable(L, -1))
{
lua_pop(L, 1); // Pop the non-table.
lua_newtable(L);
lua_pushvalue(L, -1); // Duplicate the table to leave on top.
lua_setfield(L, idx, k); // lua_stack[idx][k] = lua_stack[-1] (table)
}
return 1;
}
int luax_insistglobal(lua_State *L, const char *k)
{
lua_getglobal(L, k);
if (!lua_istable(L, -1))
{
lua_pop(L, 1); // Pop the non-table.
lua_newtable(L);
lua_pushvalue(L, -1);
lua_setglobal(L, k);
}
return 1;
}
int luax_insistlove(lua_State *L, const char *k)
{
luax_insistglobal(L, "love");
luax_insist(L, -1, k);
// The love table should be replaced with the top stack
// item. Only the reqested table should remain on the stack.
lua_replace(L, -2);
return 1;
}
int luax_getlove(lua_State *L, const char *k)
{
lua_getglobal(L, "love");
if (!lua_isnil(L, -1))
{
lua_getfield(L, -1, k);
lua_replace(L, -2);
}
return 1;
}
int luax_insistregistry(lua_State *L, Registry r)
{
switch (r)
{
case REGISTRY_GC:
return luax_insistlove(L, "_gc");
case REGISTRY_MODULES:
return luax_insistlove(L, "_modules");
case REGISTRY_TYPES:
return luax_insist(L, LUA_REGISTRYINDEX, "_lovetypes");
default:
return luaL_error(L, "Attempted to use invalid registry.");
}
}
int luax_getregistry(lua_State *L, Registry r)
{
switch (r)
{
case REGISTRY_GC:
return luax_getlove(L, "_gc");
case REGISTRY_MODULES:
return luax_getlove(L, "_modules");
case REGISTRY_TYPES:
lua_getfield(L, LUA_REGISTRYINDEX, "_lovetypes");
return 1;
default:
return luaL_error(L, "Attempted to use invalid registry.");
}
}
extern "C" int luax_typerror(lua_State *L, int narg, const char *tname)
{
int argtype = lua_type(L, narg);
const char *argtname = 0;
// We want to use the love type name for userdata, if possible.
if (argtype == LUA_TUSERDATA && luaL_getmetafield(L, narg, "__tostring") != 0)
{
lua_pushvalue(L, narg);
if (lua_pcall(L, 1, 1, 0) == 0 && lua_type(L, -1) == LUA_TSTRING)
{
argtname = lua_tostring(L, -1);
// Non-love userdata might have a tostring metamethod which doesn't
// describe its type, so we only use __tostring for love types.
love::Type t;
if (!love::getType(argtname, t))
argtname = 0;
}
}
if (argtname == 0)
argtname = lua_typename(L, argtype);
const char *msg = lua_pushfstring(L, "%s expected, got %s", tname, argtname);
return luaL_argerror(L, narg, msg);
}
StringMap<Type, TYPE_MAX_ENUM>::Entry typeEntries[] =
{
{"Invalid", INVALID_ID},
{"Object", OBJECT_ID},
{"Data", DATA_ID},
{"Module", MODULE_ID},
// Filesystem
{"File", FILESYSTEM_FILE_ID},
{"FileData", FILESYSTEM_FILE_DATA_ID},
// Font
{"GlyphData", FONT_GLYPH_DATA_ID},
{"Rasterizer", FONT_RASTERIZER_ID},
// Graphics
{"Drawable", GRAPHICS_DRAWABLE_ID},
{"Texture", GRAPHICS_TEXTURE_ID},
{"Image", GRAPHICS_IMAGE_ID},
{"Quad", GRAPHICS_QUAD_ID},
{"Font", GRAPHICS_FONT_ID},
{"ParticleSystem", GRAPHICS_PARTICLE_SYSTEM_ID},
{"SpriteBatch", GRAPHICS_SPRITE_BATCH_ID},
{"Canvas", GRAPHICS_CANVAS_ID},
{"Shader", GRAPHICS_SHADER_ID},
{"Mesh", GRAPHICS_MESH_ID},
// Image
{"ImageData", IMAGE_IMAGE_DATA_ID},
{"CompressedData", IMAGE_COMPRESSED_DATA_ID},
// Joystick
{"Joystick", JOYSTICK_JOYSTICK_ID},
// Math
{"RandomGenerator", MATH_RANDOM_GENERATOR_ID},
{"BezierCurve", MATH_BEZIER_CURVE_ID},
// Audio
{"Source", AUDIO_SOURCE_ID},
// Sound
{"SoundData", SOUND_SOUND_DATA_ID},
{"Decoder", SOUND_DECODER_ID},
// Mouse
{"Cursor", MOUSE_CURSOR_ID},
// Physics
{"World", PHYSICS_WORLD_ID},
{"Contact", PHYSICS_CONTACT_ID},
{"Body", PHYSICS_BODY_ID},
{"Fixture", PHYSICS_FIXTURE_ID},
{"Shape", PHYSICS_SHAPE_ID},
{"CircleShape", PHYSICS_CIRCLE_SHAPE_ID},
{"PolygonShape", PHYSICS_POLYGON_SHAPE_ID},
{"EdgeShape", PHYSICS_EDGE_SHAPE_ID},
{"ChainShape", PHYSICS_CHAIN_SHAPE_ID},
{"Joint", PHYSICS_JOINT_ID},
{"MouseJoint", PHYSICS_MOUSE_JOINT_ID},
{"DistanceJoint", PHYSICS_DISTANCE_JOINT_ID},
{"PrismaticJoint", PHYSICS_PRISMATIC_JOINT_ID},
{"RevoluteJoint", PHYSICS_REVOLUTE_JOINT_ID},
{"PulleyJoint", PHYSICS_PULLEY_JOINT_ID},
{"GearJoint", PHYSICS_GEAR_JOINT_ID},
{"FrictionJoint", PHYSICS_FRICTION_JOINT_ID},
{"WeldJoint", PHYSICS_WELD_JOINT_ID},
{"RopeJoint", PHYSICS_ROPE_JOINT_ID},
{"WheelJoint", PHYSICS_WHEEL_JOINT_ID},
{"MotorJoint", PHYSICS_MOTOR_JOINT_ID},
// Thread
{"Thread", THREAD_THREAD_ID},
{"Channel", THREAD_CHANNEL_ID},
// The modules themselves. Only add abstracted modules here.
{"filesystem", MODULE_FILESYSTEM_ID},
{"graphics", MODULE_GRAPHICS_ID},
{"image", MODULE_IMAGE_ID},
{"sound", MODULE_SOUND_ID},
};
StringMap<Type, TYPE_MAX_ENUM> types(typeEntries, sizeof(typeEntries));
bool getType(const char *in, love::Type &out)
{
return types.find(in, out);
}
bool getType(love::Type in, const char *&out)
{
return types.find(in, out);
}
Type luax_type(lua_State *L, int idx)
{
Type t = INVALID_ID;
types.find(luaL_checkstring(L, idx), t);
return t;
}
} // love
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