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1096
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1 /**
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2 * Copyright (c) 2006-2012 LOVE Development Team
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3 *
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4 * This software is provided 'as-is', without any express or implied
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5 * warranty. In no event will the authors be held liable for any damages
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6 * arising from the use of this software.
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7 *
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8 * Permission is granted to anyone to use this software for any purpose,
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9 * including commercial applications, and to alter it and redistribute it
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10 * freely, subject to the following restrictions:
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11 *
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12 * 1. The origin of this software must not be misrepresented; you must not
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13 * claim that you wrote the original software. If you use this software
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14 * in a product, an acknowledgment in the product documentation would be
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15 * appreciated but is not required.
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16 * 2. Altered source versions must be plainly marked as such, and must not be
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17 * misrepresented as being the original software.
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18 * 3. This notice may not be removed or altered from any source distribution.
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19 **/
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20
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21 #include "runtime.h"
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22
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23 // LOVE
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24 #include "Module.h"
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25 #include "Object.h"
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26 #include "Reference.h"
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27 #include "StringMap.h"
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28 #include "thread/threads.h"
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29
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30 // STD
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31 #include <iostream>
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32
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33 namespace love
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34 {
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35
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36 static thread::Mutex *gcmutex = 0;
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37 void *_gcmutex = 0;
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38 unsigned int _gcthread = 0;
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39 /**
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40 * Called when an object is collected. The object is released
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41 * once in this function, possibly deleting it.
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42 **/
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43 static int w__gc(lua_State *L)
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44 {
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45 if (!gcmutex)
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46 {
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47 gcmutex = new thread::Mutex();
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48 _gcmutex = (void *) gcmutex;
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49 }
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50 Proxy *p = (Proxy *)lua_touserdata(L, 1);
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51 Object *t = (Object *)p->data;
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52 if (p->own)
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53 {
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54 thread::Lock lock(gcmutex);
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55 _gcthread = thread::ThreadBase::threadId();
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56 t->release();
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57 }
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58 return 0;
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59 }
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60
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61 static int w__tostring(lua_State *L)
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62 {
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63 lua_pushvalue(L, lua_upvalueindex(1));
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64 return 1;
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65 }
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66
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67 static int w__typeOf(lua_State *L)
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68 {
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69 Proxy *p = (Proxy *)lua_touserdata(L, 1);
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70 Type t = luax_type(L, 2);
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71 luax_pushboolean(L, p->flags[t]);
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72 return 1;
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73 }
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74
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75 static int w__eq(lua_State *L)
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76 {
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77 Proxy *p1 = (Proxy *)lua_touserdata(L, 1);
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78 Proxy *p2 = (Proxy *)lua_touserdata(L, 2);
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79 luax_pushboolean(L, p1->data == p2->data);
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80 return 1;
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81 }
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82
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83 Reference *luax_refif (lua_State *L, int type)
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84 {
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85 Reference *r = 0;
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86
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87 // Create a reference only if the test succeeds.
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88 if (lua_type(L, -1) == type)
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89 r = new Reference(L);
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90 else // Pop the value even if it fails (but also if it succeeds).
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91 lua_pop(L, 1);
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92
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93 return r;
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94 }
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95
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96 void luax_printstack(lua_State *L)
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97 {
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98 for (int i = 1; i<=lua_gettop(L); i++)
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99 {
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100 std::cout << i << " - " << luaL_typename(L, i) << std::endl;
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101 }
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102 }
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103
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104 bool luax_toboolean(lua_State *L, int idx)
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105 {
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106 return (lua_toboolean(L, idx) != 0);
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107 }
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108
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109 void luax_pushboolean(lua_State *L, bool b)
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110 {
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111 lua_pushboolean(L, b ? 1 : 0);
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112 }
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113
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114 bool luax_optboolean(lua_State *L, int idx, bool b)
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115 {
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116 if (lua_isboolean(L, idx) == 1)
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117 return (lua_toboolean(L, idx) == 1 ? true : false);
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118 return b;
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119 }
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120
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121 std::string luax_checkstring(lua_State *L, int idx)
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122 {
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123 size_t len;
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124 const char *str = luaL_checklstring(L, idx, &len);
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125 return std::string(str, len);
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126 }
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127
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128 void luax_pushstring(lua_State *L, std::string str)
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129 {
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130 lua_pushlstring(L, str.data(), str.size());
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131 }
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132
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133 int luax_assert_argc(lua_State *L, int min)
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134 {
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135 int argc = lua_gettop(L);
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136 if (argc < min)
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137 return luaL_error(L, "Incorrect number of arguments. Got [%d], expected at least [%d]", argc, min);
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138 return 0;
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139 }
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140
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141 int luax_assert_argc(lua_State *L, int min, int max)
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142 {
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143 int argc = lua_gettop(L);
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144 if (argc < min || argc > max)
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145 return luaL_error(L, "Incorrect number of arguments. Got [%d], expected [%d-%d]", argc, min, max);
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146 return 0;
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147 }
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148
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149 int luax_assert_function(lua_State *L, int n)
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150 {
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151 if (!lua_isfunction(L, n))
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152 return luaL_error(L, "Argument must be of type \"function\".");
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153 return 0;
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154 }
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155
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156 int luax_register_module(lua_State *L, const WrappedModule &m)
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157 {
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158 // Put a reference to the C++ module in Lua.
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159 luax_getregistry(L, REGISTRY_MODULES);
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160
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161 Proxy *p = (Proxy *)lua_newuserdata(L, sizeof(Proxy));
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162 p->own = true;
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163 p->data = m.module;
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164 p->flags = m.flags;
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165
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166 luaL_newmetatable(L, m.module->getName());
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167 lua_pushvalue(L, -1);
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168 lua_setfield(L, -2, "__index");
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169 lua_pushcfunction(L, w__gc);
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170 lua_setfield(L, -2, "__gc");
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171
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172 lua_setmetatable(L, -2);
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173 lua_setfield(L, -2, m.name); // _modules[name] = proxy
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174 lua_pop(L, 1);
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175
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176 // Gets the love table.
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177 luax_insistglobal(L, "love");
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178
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179 // Create new table for module.
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180 lua_newtable(L);
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181
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182 // Register all the functions.
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183 luaL_register(L, 0, m.functions);
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184
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185 // Register types.
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186 if (m.types != 0)
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187 for (const lua_CFunction *t = m.types; *t != 0; t++)
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188 (*t)(L);
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189
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190 lua_pushvalue(L, -1);
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191 lua_setfield(L, -3, m.name); // love.graphics = table
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192 lua_remove(L, -2); // love
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193
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194 return 1;
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195 }
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196
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197 int luax_preload(lua_State *L, lua_CFunction f, const char *name)
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198 {
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199 lua_getglobal(L, "package");
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200 lua_getfield(L, -1, "preload");
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201 lua_pushcfunction(L, f);
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202 lua_setfield(L, -2, name);
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203 lua_pop(L, 2);
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204 return 0;
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205 }
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206
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207 int luax_register_type(lua_State *L, const char *tname, const luaL_Reg *f)
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208 {
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209 luaL_newmetatable(L, tname);
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210
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211 // m.__index = m
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212 lua_pushvalue(L, -1);
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213 lua_setfield(L, -2, "__index");
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214
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215 // setup gc
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216 lua_pushcfunction(L, w__gc);
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217 lua_setfield(L, -2, "__gc");
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218
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219 // Add equality
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220 lua_pushcfunction(L, w__eq);
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221 lua_setfield(L, -2, "__eq");
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222
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223 // Add tostring function.
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224 lua_pushstring(L, tname);
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225 lua_pushcclosure(L, w__tostring, 1);
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226 lua_setfield(L, -2, "__tostring");
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227
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228 // Add tostring to as type() as well.
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229 lua_pushstring(L, tname);
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230 lua_pushcclosure(L, w__tostring, 1);
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231 lua_setfield(L, -2, "type");
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232
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233 // Add typeOf
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234 lua_pushcfunction(L, w__typeOf);
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235 lua_setfield(L, -2, "typeOf");
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236
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237 if (f != 0)
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238 luaL_register(L, 0, f);
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239
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240 lua_pop(L, 1); // Pops metatable.
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241 return 0;
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242 }
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243
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244 int luax_table_insert(lua_State *L, int tindex, int vindex, int pos)
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245 {
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246 if (tindex < 0)
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247 tindex = lua_gettop(L)+1+tindex;
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248 if (vindex < 0)
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249 vindex = lua_gettop(L)+1+vindex;
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250 if (pos == -1)
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251 {
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252 lua_pushvalue(L, vindex);
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253 lua_rawseti(L, tindex, lua_objlen(L, tindex)+1);
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254 return 0;
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255 }
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256 else if (pos < 0)
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257 pos = lua_objlen(L, tindex)+1+pos;
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258 for (int i = lua_objlen(L, tindex)+1; i > pos; i--)
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259 {
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260 lua_rawgeti(L, tindex, i-1);
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261 lua_rawseti(L, tindex, i);
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262 }
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263 lua_pushvalue(L, vindex);
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264 lua_rawseti(L, tindex, pos);
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265 return 0;
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266 }
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267
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268 int luax_register_searcher(lua_State *L, lua_CFunction f, int pos)
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269 {
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270 // Add the package loader to the package.loaders table.
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271 lua_getglobal(L, "package");
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272
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273 if (lua_isnil(L, -1))
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274 return luaL_error(L, "Can't register searcher: package table does not exist.");
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275
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276 lua_getfield(L, -1, "loaders");
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277
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278 if (lua_isnil(L, -1))
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279 return luaL_error(L, "Can't register searcher: package.loaders table does not exist.");
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280
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281 lua_pushcfunction(L, f);
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282 luax_table_insert(L, -2, -1, pos);
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283 lua_pop(L, 3);
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284 return 0;
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285 }
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286
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287 void luax_newtype(lua_State *L, const char *name, bits flags, void *data, bool own)
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288 {
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289 Proxy *u = (Proxy *)lua_newuserdata(L, sizeof(Proxy));
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290
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291 u->data = data;
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292 u->flags = flags;
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293 u->own = own;
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294
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295 luaL_newmetatable(L, name);
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296 lua_setmetatable(L, -2);
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297 }
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298
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299 bool luax_istype(lua_State *L, int idx, love::bits type)
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300 {
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301 if (lua_isuserdata(L, idx) == 0)
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302 return false;
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303
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304 return ((((Proxy *)lua_touserdata(L, idx))->flags & type) == type);
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305 }
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306
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307 int luax_getfunction(lua_State *L, const char *mod, const char *fn)
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308 {
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309 lua_getglobal(L, "love");
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310 if (lua_isnil(L, -1)) return luaL_error(L, "Could not find global love!");
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311 lua_getfield(L, -1, mod);
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312 if (lua_isnil(L, -1)) return luaL_error(L, "Could not find love.%s!", mod);
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313 lua_getfield(L, -1, fn);
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314 if (lua_isnil(L, -1)) return luaL_error(L, "Could not find love.%s.%s!", mod, fn);
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315
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316 lua_remove(L, -2); // remove mod
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317 lua_remove(L, -2); // remove fn
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318 return 0;
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319 }
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320
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321 int luax_convobj(lua_State *L, int idx, const char *mod, const char *fn)
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322 {
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323 // Convert string to a file.
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324 luax_getfunction(L, mod, fn);
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325 lua_pushvalue(L, idx); // The initial argument.
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326 lua_call(L, 1, 1); // Call the function, one arg, one return value.
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327 lua_replace(L, idx); // Replace the initial argument with the new object.
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328 return 0;
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329 }
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330
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331 int luax_convobj(lua_State *L, int idxs[], int n, const char *mod, const char *fn)
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332 {
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333 luax_getfunction(L, mod, fn);
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334 for (int i = 0; i < n; i++)
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335 {
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336 lua_pushvalue(L, idxs[i]); // The arguments.
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337 }
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338 lua_call(L, n, 1); // Call the function, n args, one return value.
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339 lua_replace(L, idxs[0]); // Replace the initial argument with the new object.
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340 return 0;
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341 }
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342
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343 int luax_strtofile(lua_State *L, int idx)
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344 {
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345 return luax_convobj(L, idx, "filesystem", "newFile");
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346 }
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347
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348 int luax_filetodata(lua_State *L, int idx)
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349 {
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350 return luax_convobj(L, idx, "filesystem", "read");
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351 }
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352
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353 int luax_insist(lua_State *L, int idx, const char *k)
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354 {
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355 // Convert to absolute index if necessary.
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356 if (idx < 0 && idx > LUA_REGISTRYINDEX)
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357 idx = lua_gettop(L) + ++idx;
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358
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359 lua_getfield(L, idx, k);
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360
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361 // Create if necessary.
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362 if (!lua_istable(L, -1))
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363 {
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364 lua_pop(L, 1); // Pop the non-table.
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365 lua_newtable(L);
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366 lua_pushvalue(L, -1); // Duplicate the table to leave on top.
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367 lua_setfield(L, idx, k); // lua_stack[idx][k] = lua_stack[-1] (table)
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368 }
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369
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370 return 1;
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371 }
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372
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373 int luax_insistglobal(lua_State *L, const char *k)
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374 {
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375 lua_getglobal(L, k);
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376
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377 if (!lua_istable(L, -1))
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378 {
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379 lua_pop(L, 1); // Pop the non-table.
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380 lua_newtable(L);
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381 lua_pushvalue(L, -1);
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382 lua_setglobal(L, k);
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383 }
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384
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385 return 1;
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386 }
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387
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388 int luax_insistlove(lua_State *L, const char *k)
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389 {
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390 luax_insistglobal(L, "love");
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391 luax_insist(L, -1, k);
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392
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393 // The love table should be replaced with the top stack
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394 // item. Only the reqested table should remain on the stack.
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395 lua_replace(L, -2);
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396
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397 return 1;
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398 }
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399
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400 int luax_getregistry(lua_State *L, Registry r)
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401 {
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402 switch (r)
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403 {
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404 case REGISTRY_GC:
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405 return luax_insistlove(L, "_gc");
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406 case REGISTRY_MODULES:
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407 return luax_insistlove(L, "_modules");
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408 default:
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409 return luaL_error(L, "Attempted to use invalid registry.");
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410 }
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411 }
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412
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413 StringMap<Type, TYPE_MAX_ENUM>::Entry typeEntries[] =
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414 {
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415 {"Invalid", INVALID_ID},
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416
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417 {"Object", OBJECT_ID},
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418 {"Data", DATA_ID},
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419 {"Module", MODULE_ID},
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420
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421 // Filesystem
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422 {"File", FILESYSTEM_FILE_ID},
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423 {"FileData", FILESYSTEM_FILE_DATA_ID},
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424
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425 // Font
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426 {"GlyphData", FONT_GLYPH_DATA_ID},
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427 {"Rasterizer", FONT_RASTERIZER_ID},
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428
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429 // Graphics
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430 {"Drawable", GRAPHICS_DRAWABLE_ID},
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431 {"Image", GRAPHICS_IMAGE_ID},
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432 {"Quad", GRAPHICS_QUAD_ID},
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433 {"Font", GRAPHICS_FONT_ID},
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434 {"ParticleSystem", GRAPHICS_PARTICLE_SYSTEM_ID},
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435 {"SpriteBatch", GRAPHICS_SPRITE_BATCH_ID},
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436 {"Canvas", GRAPHICS_CANVAS_ID},
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437
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438 // Image
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439 {"ImageData", IMAGE_IMAGE_DATA_ID},
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440
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441 // Audio
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442 {"Source", AUDIO_SOURCE_ID},
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443
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444 // Sound
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445 {"SoundData", SOUND_SOUND_DATA_ID},
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446 {"Decoder", SOUND_DECODER_ID},
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447
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448 // Physics
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449 {"World", PHYSICS_WORLD_ID},
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450 {"Contact", PHYSICS_CONTACT_ID},
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451 {"Body", PHYSICS_BODY_ID},
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452 {"Shape", PHYSICS_SHAPE_ID},
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453 {"CircleShape", PHYSICS_CIRCLE_SHAPE_ID},
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454 {"PolygonShape", PHYSICS_POLYGON_SHAPE_ID},
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455 {"Joint", PHYSICS_JOINT_ID},
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456 {"MouseJoint", PHYSICS_MOUSE_JOINT_ID},
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457 {"DistanceJoint", PHYSICS_DISTANCE_JOINT_ID},
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458 {"PrismaticJoint", PHYSICS_PRISMATIC_JOINT_ID},
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459 {"RevoluteJoint", PHYSICS_REVOLUTE_JOINT_ID},
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|
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460 {"PulleyJoint", PHYSICS_PULLEY_JOINT_ID},
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|
|
461 {"GearJoint", PHYSICS_GEAR_JOINT_ID},
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462
|
|
|
463 // Thread
|
|
|
464 {"Thread", THREAD_THREAD_ID},
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465
|
|
|
466 // The modules themselves. Only add abstracted modules here.
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|
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467 {"filesystem", MODULE_FILESYSTEM_ID},
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|
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468 {"image", MODULE_IMAGE_ID},
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|
|
469 {"sound", MODULE_SOUND_ID},
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|
|
470 };
|
|
|
471
|
|
|
472 StringMap<Type, TYPE_MAX_ENUM> types(typeEntries, sizeof(typeEntries));
|
|
|
473
|
|
|
474 Type luax_type(lua_State *L, int idx)
|
|
|
475 {
|
|
|
476 Type t = INVALID_ID;
|
|
|
477 types.find(luaL_checkstring(L, idx), t);
|
|
|
478 return t;
|
|
|
479 }
|
|
|
480
|
|
|
481 } // love
|
