lua: pack.get_folder(pack_name) + shader fix

res/shaders/main.glslf

@@ -16,7 +16,7 @@ void main(){
 	float depth = (a_distance/256.0);
 	float alpha = a_color.a * tex_color.a;
 	// anyway it's any alpha-test alternative required
-	if (alpha < 0.1f)
+	if (alpha < 0.5f)
 		discard;
 	f_color = mix(a_color * tex_color, vec4(fogColor,1.0), min(1.0, pow(depth*u_fogFactor, u_fogCurve)));
 	f_color.a = alpha;

src/engine.cpp

@@ -46,7 +46,7 @@ Engine::Engine(EngineSettings& settings, EnginePaths* paths)
 	}
 
     auto resdir = paths->getResources();
-    scripting::initialize(paths);
+    scripting::initialize(this);
 
 	std::cout << "-- loading assets" << std::endl;
     std::vector<fs::path> roots {resdir};

src/logic/scripting/api_lua.cpp

@@ -13,6 +13,7 @@
 #include "../../voxels/voxel.h"
 #include "../../lighting/Lighting.h"
 #include "../../logic/BlocksController.h"
+#include "../../engine.h"
 
 inline int lua_pushivec3(lua_State* L, int x, int y, int z) {
     lua_pushinteger(L, x);
@@ -27,7 +28,25 @@ inline void luaL_openlib(lua_State* L, const char* name, const luaL_Reg* libfunc
     lua_setglobal(L, name);
 }
 
-/* == world library ==*/
+/* == pack library == */
+static int l_pack_get_folder(lua_State* L) {
+    std::string packName = lua_tostring(L, 1);
+    for (auto& pack : scripting::engine->getContentPacks()) {
+        if (pack.id == packName) {
+            lua_pushstring(L, (pack.folder.u8string()+"/").c_str());
+            return 1;
+        }
+    }
+    lua_pushstring(L, "");
+    return 1;
+}
+
+static const luaL_Reg packlib [] = {
+    {"get_folder", l_pack_get_folder},
+    {NULL, NULL}
+};
+
+/* == world library == */
 static int l_world_get_day_time(lua_State* L) {
     lua_pushnumber(L, scripting::level->world->daytime);
     return 1;
@@ -266,6 +285,7 @@ static int l_is_replaceable_at(lua_State* L) {
                                     lua_setglobal(L, NAME))
 
 void apilua::create_funcs(lua_State* L) {
+    luaL_openlib(L, "pack", packlib, 0);
     luaL_openlib(L, "world", worldlib, 0);
     luaL_openlib(L, "player", playerlib, 0);
 

src/logic/scripting/scripting.cpp

@@ -11,19 +11,19 @@
 #include "../../voxels/Block.h"
 #include "../../items/ItemDef.h"
 #include "../../logic/BlocksController.h"
+#include "../../engine.h"
 #include "api_lua.h"
 
 using namespace scripting;
 
 namespace scripting {
     extern lua_State* L;
-    extern EnginePaths* paths;
 }
 
+Engine* scripting::engine = nullptr;
 lua_State* scripting::L = nullptr;
 Level* scripting::level = nullptr;
 const Content* scripting::content = nullptr;
-EnginePaths* scripting::paths = nullptr;
 BlocksController* scripting::blocks = nullptr;
 
 inline int lua_pushivec3(lua_State* L, int x, int y, int z) {
@@ -58,8 +58,8 @@ int call_func(lua_State* L, int argc, const std::string& name) {
     return 1;
 }
 
-void scripting::initialize(EnginePaths* paths) {
+void scripting::initialize(Engine* engine) {
-    scripting::paths = paths;
+    scripting::engine = engine;
 
     L = luaL_newstate();
     if (L == nullptr) {
@@ -87,7 +87,7 @@ void scripting::on_world_load(Level* level, BlocksController* blocks) {
     scripting::level = level;
     scripting::content = level->content;
     scripting::blocks = blocks;
-
+    auto paths = scripting::engine->getPaths();
     fs::path file = paths->getResources()/fs::path("scripts/world.lua");
     std::string src = files::read_string(file);
     luaL_loadbuffer(L, src.c_str(), src.length(), file.string().c_str());

src/logic/scripting/scripting.h

@@ -3,7 +3,7 @@
 
 namespace fs = std::filesystem;
 
-class EnginePaths;
+class Engine;
 class Content;
 class Level;
 class Block;
@@ -14,11 +14,12 @@ struct item_funcs_set;
 class BlocksController;
 
 namespace scripting {
+    extern Engine* engine;
     extern const Content* content;
     extern Level* level;
     extern BlocksController* blocks;
 
-    void initialize(EnginePaths* paths);
+    void initialize(Engine* engine);
     void on_world_load(Level* level, BlocksController* blocks);
     void on_world_quit();
     void update_block(const Block* block, int x, int y, int z);