[CSM] Add camera API (#5609)

* [CSM] Add camera API
roper rebase & squash

* Address nerzhul's review

7 files changed, 262 insertions, 56 deletions

diff --git a/src/script/lua_api/CMakeLists.txt b/src/script/lua_api/CMakeLists.txt
index b03e94a09..1a78580e6 100644
--- a/src/script/lua_api/CMakeLists.txt
+++ b/src/script/lua_api/CMakeLists.txt
@@ -29,4 +29,5 @@ set(client_SCRIPT_LUA_API_SRCS
 	${CMAKE_CURRENT_SOURCE_DIR}/l_storage.cpp
 	${CMAKE_CURRENT_SOURCE_DIR}/l_sound.cpp
 	${CMAKE_CURRENT_SOURCE_DIR}/l_localplayer.cpp
+	${CMAKE_CURRENT_SOURCE_DIR}/l_camera.cpp
 	PARENT_SCOPE)
diff --git a/src/script/lua_api/l_camera.cpp b/src/script/lua_api/l_camera.cpp
new file mode 100644
index 000000000..e6229ffe8
--- /dev/null
+++ b/src/script/lua_api/l_camera.cpp
@@ -0,0 +1,206 @@
+#include "script/common/c_converter.h"
+#include "l_camera.h"
+#include "l_internal.h"
+#include "content_cao.h"
+#include "camera.h"
+
+LuaCamera::LuaCamera(Camera *m)
+{
+	m_camera = m;
+}
+
+void LuaCamera::create(lua_State *L, Camera *m)
+{
+	LuaCamera *o = new LuaCamera(m);
+	*(void **) (lua_newuserdata(L, sizeof(void *))) = o;
+	luaL_getmetatable(L, className);
+	lua_setmetatable(L, -2);
+	
+	int camera_object = lua_gettop(L);
+	
+	lua_getglobal(L, "core");
+	luaL_checktype(L, -1, LUA_TTABLE);
+	int coretable = lua_gettop(L);
+	
+	lua_pushvalue(L, camera_object);
+	lua_setfield(L, coretable, "camera");
+}
+
+int LuaCamera::l_set_camera_mode(lua_State *L)
+{
+	Camera *camera = getobject(L, 1);
+	GenericCAO *playercao = getClient(L)->getEnv().getLocalPlayer()->getCAO();
+	if (!camera)
+		return 0;
+	sanity_check(playercao);
+	if (!lua_isnumber(L, 2))
+		return 0;
+	
+	camera->setCameraMode((CameraMode)((int)lua_tonumber(L, 2)));
+	playercao->setVisible(camera->getCameraMode() > CAMERA_MODE_FIRST);
+	playercao->setChildrenVisible(camera->getCameraMode() > CAMERA_MODE_FIRST);
+	return 0;
+}
+
+int LuaCamera::l_get_camera_mode(lua_State *L)
+{
+	Camera *camera = getobject(L, 1);
+	if (!camera)
+		return 0;
+	
+	lua_pushnumber(L, (int)camera->getCameraMode());
+	
+	return 1;
+}
+
+int LuaCamera::l_get_fov(lua_State *L)
+{
+	Camera *camera = getobject(L, 1);
+	if (!camera)
+		return 0;
+	
+	lua_newtable(L);
+	lua_pushnumber(L, camera->getFovX() * core::DEGTORAD);
+	lua_setfield(L, -2, "x");
+	lua_pushnumber(L, camera->getFovY() * core::DEGTORAD);
+	lua_setfield(L, -2, "y");
+	lua_pushnumber(L, camera->getCameraNode()->getFOV() * core::RADTODEG);
+	lua_setfield(L, -2, "actual");
+	lua_pushnumber(L, camera->getFovMax() * core::RADTODEG);
+	lua_setfield(L, -2, "max");
+	return 1;
+}
+
+int LuaCamera::l_get_pos(lua_State *L)
+{
+	Camera *camera = getobject(L, 1);
+	if (!camera)
+		return 0;
+	
+	push_v3f(L, camera->getPosition());
+	return 1;
+}
+
+int LuaCamera::l_get_offset(lua_State *L)
+{
+	Camera *camera = getobject(L, 1);
+	if (!camera)
+		return 0;
+	
+	push_v3s16(L, camera->getOffset());
+	return 1;
+}
+
+int LuaCamera::l_get_look_dir(lua_State *L)
+{
+	LocalPlayer *player = getClient(L)->getEnv().getLocalPlayer();
+	sanity_check(player);
+
+	float pitch = -1.0 * player->getPitch() * core::DEGTORAD;
+	float yaw = (player->getYaw() + 90.) * core::DEGTORAD;
+	v3f v(cos(pitch) * cos(yaw), sin(pitch), cos(pitch) * sin(yaw));
+
+	push_v3f(L, v);
+	return 1;
+}
+
+int LuaCamera::l_get_look_horizontal(lua_State *L)
+{
+	LocalPlayer *player = getClient(L)->getEnv().getLocalPlayer();
+	sanity_check(player);
+
+	lua_pushnumber(L, (player->getYaw() + 90.) * core::DEGTORAD);
+	return 1;
+}
+
+int LuaCamera::l_get_look_vertical(lua_State *L)
+{
+	LocalPlayer *player = getClient(L)->getEnv().getLocalPlayer();
+	sanity_check(player);
+
+	lua_pushnumber(L, -1.0 * player->getPitch() * core::DEGTORAD);
+	return 1;
+}
+
+int LuaCamera::l_get_aspect_ratio(lua_State *L)
+{
+	Camera *camera = getobject(L, 1);
+	if (!camera)
+		return 0;
+	
+	lua_pushnumber(L, camera->getCameraNode()->getAspectRatio());
+	return 1;
+}
+
+LuaCamera *LuaCamera::checkobject(lua_State *L, int narg)
+{
+	luaL_checktype(L, narg, LUA_TUSERDATA);
+	
+	void *ud = luaL_checkudata(L, narg, className);
+	if (!ud)
+		luaL_typerror(L, narg, className);
+	
+	return *(LuaCamera **) ud;
+}
+
+Camera *LuaCamera::getobject(LuaCamera *ref)
+{
+	return ref->m_camera;
+}
+
+Camera *LuaCamera::getobject(lua_State *L, int narg)
+{
+	LuaCamera *ref = checkobject(L, narg);
+	assert(ref);
+	Camera *camera = getobject(ref);
+	if (!camera)
+		return NULL;
+	return camera;
+}
+
+int LuaCamera::gc_object(lua_State *L)
+{
+	LuaCamera *o = *(LuaCamera **) (lua_touserdata(L, 1));
+	delete o;
+	return 0;
+}
+
+void LuaCamera::Register(lua_State *L)
+{
+	lua_newtable(L);
+	int methodtable = lua_gettop(L);
+	luaL_newmetatable(L, className);
+	int metatable = lua_gettop(L);
+	
+	lua_pushliteral(L, "__metatable");
+	lua_pushvalue(L, methodtable);
+	lua_settable(L, metatable);
+	
+	lua_pushliteral(L, "__index");
+	lua_pushvalue(L, methodtable);
+	lua_settable(L, metatable);
+	
+	lua_pushliteral(L, "__gc");
+	lua_pushcfunction(L, gc_object);
+	lua_settable(L, metatable);
+	
+	lua_pop(L, 1);
+	
+	luaL_openlib(L, 0, methods, 0);
+	lua_pop(L, 1);
+}
+
+const char LuaCamera::className[] = "Camera";
+const luaL_reg LuaCamera::methods[] = {
+	luamethod(LuaCamera, set_camera_mode),
+	luamethod(LuaCamera, get_camera_mode),
+	luamethod(LuaCamera, get_fov),
+	luamethod(LuaCamera, get_pos),
+	luamethod(LuaCamera, get_offset),
+	luamethod(LuaCamera, get_look_dir),
+	luamethod(LuaCamera, get_look_vertical),
+	luamethod(LuaCamera, get_look_horizontal),
+	luamethod(LuaCamera, get_aspect_ratio),
+	
+	{0, 0}
+};
diff --git a/src/script/lua_api/l_camera.h b/src/script/lua_api/l_camera.h
new file mode 100644
index 000000000..82ab6a47f
--- /dev/null
+++ b/src/script/lua_api/l_camera.h
@@ -0,0 +1,46 @@
+#ifndef L_CAMERA_H
+#define L_CAMERA_H
+
+#include "l_base.h"
+
+class Camera;
+
+class LuaCamera : public ModApiBase {
+private: 
+
+	static const char className[];
+	static const luaL_Reg methods[];
+	
+	// garbage collector
+	static int gc_object(lua_State *L);
+	
+	static int l_set_camera_mode(lua_State *L);
+	static int l_get_camera_mode(lua_State *L);
+	
+	static int l_get_fov(lua_State *L);
+	
+	static int l_get_pos(lua_State *L);
+	static int l_get_offset(lua_State *L);
+	static int l_get_look_dir(lua_State *L);
+	static int l_get_look_vertical(lua_State *L);
+	static int l_get_look_horizontal(lua_State *L);
+	static int l_get_aspect_ratio(lua_State *L);
+	
+	Camera *m_camera;
+	
+public:
+
+	LuaCamera(Camera *m);
+	~LuaCamera() {}
+	
+	static void create(lua_State *L, Camera *m);
+	
+	static LuaCamera *checkobject(lua_State *L, int narg);
+	static Camera *getobject(LuaCamera *ref);
+	static Camera *getobject(lua_State *L, int narg);
+	
+	static void Register(lua_State *L);
+	
+};
+
+#endif // L_CAMERA_H
diff --git a/src/script/lua_api/l_localplayer.cpp b/src/script/lua_api/l_localplayer.cpp
index 177df55f3..7ec4eaa62 100644
--- a/src/script/lua_api/l_localplayer.cpp
+++ b/src/script/lua_api/l_localplayer.cpp
@@ -203,34 +203,6 @@ int LuaLocalPlayer::l_get_breath(lua_State *L)
 	return 1;
 }
 
-int LuaLocalPlayer::l_get_look_dir(lua_State *L)
-{
-	LocalPlayer *player = getobject(L, 1);
-
-	float pitch = -1.0 * player->getPitch() * core::DEGTORAD;
-	float yaw = (player->getYaw() + 90.) * core::DEGTORAD;
-	v3f v(cos(pitch) * cos(yaw), sin(pitch), cos(pitch) * sin(yaw));
-
-	push_v3f(L, v);
-	return 1;
-}
-
-int LuaLocalPlayer::l_get_look_horizontal(lua_State *L)
-{
-	LocalPlayer *player = getobject(L, 1);
-
-	lua_pushnumber(L, (player->getYaw() + 90.) * core::DEGTORAD);
-	return 1;
-}
-
-int LuaLocalPlayer::l_get_look_vertical(lua_State *L)
-{
-	LocalPlayer *player = getobject(L, 1);
-
-	lua_pushnumber(L, -1.0 * player->getPitch() * core::DEGTORAD);
-	return 1;
-}
-
 int LuaLocalPlayer::l_get_pos(lua_State *L)
 {
 	LocalPlayer *player = getobject(L, 1);
@@ -239,22 +211,6 @@ int LuaLocalPlayer::l_get_pos(lua_State *L)
 	return 1;
 }
 
-int LuaLocalPlayer::l_get_eye_pos(lua_State *L)
-{
-	LocalPlayer *player = getobject(L, 1);
-
-	push_v3f(L, player->getEyePosition());
-	return 1;
-}
-
-int LuaLocalPlayer::l_get_eye_offset(lua_State *L)
-{
-	LocalPlayer *player = getobject(L, 1);
-
-	push_v3f(L, player->getEyeOffset());
-	return 1;
-}
-
 int LuaLocalPlayer::l_get_movement_acceleration(lua_State *L)
 {
 	LocalPlayer *player = getobject(L, 1);
@@ -393,12 +349,7 @@ const luaL_Reg LuaLocalPlayer::methods[] = {
 		luamethod(LuaLocalPlayer, get_last_look_vertical),
 		luamethod(LuaLocalPlayer, get_key_pressed),
 		luamethod(LuaLocalPlayer, get_breath),
-		luamethod(LuaLocalPlayer, get_look_dir),
-		luamethod(LuaLocalPlayer, get_look_horizontal),
-		luamethod(LuaLocalPlayer, get_look_vertical),
 		luamethod(LuaLocalPlayer, get_pos),
-		luamethod(LuaLocalPlayer, get_eye_pos),
-		luamethod(LuaLocalPlayer, get_eye_offset),
 		luamethod(LuaLocalPlayer, get_movement_acceleration),
 		luamethod(LuaLocalPlayer, get_movement_speed),
 		luamethod(LuaLocalPlayer, get_movement),
diff --git a/src/script/lua_api/l_localplayer.h b/src/script/lua_api/l_localplayer.h
index 6ec3f4c09..e56ec808f 100644
--- a/src/script/lua_api/l_localplayer.h
+++ b/src/script/lua_api/l_localplayer.h
@@ -59,15 +59,8 @@ private:
 
 	static int l_get_breath(lua_State *L);
 
-	static int l_get_look_dir(lua_State *L);
-	static int l_get_look_horizontal(lua_State *L);
-	static int l_get_look_vertical(lua_State *L);
-
 	static int l_get_pos(lua_State *L);
 
-	static int l_get_eye_pos(lua_State *L);
-	static int l_get_eye_offset(lua_State *L);
-
 	static int l_get_movement_acceleration(lua_State *L);
 
 	static int l_get_movement_speed(lua_State *L);
diff --git a/src/script/scripting_client.cpp b/src/script/scripting_client.cpp
index 8ff5abcc4..b5a5085be 100644
--- a/src/script/scripting_client.cpp
+++ b/src/script/scripting_client.cpp
@@ -30,6 +30,7 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 #include "lua_api/l_item.h"
 #include "lua_api/l_nodemeta.h"
 #include "lua_api/l_localplayer.h"
+#include "lua_api/l_camera.h"
 
 ClientScripting::ClientScripting(Client *client):
 	ScriptApiBase()
@@ -71,6 +72,7 @@ void ClientScripting::InitializeModApi(lua_State *L, int top)
 	LuaMinimap::Register(L);
 	NodeMetaRef::RegisterClient(L);
 	LuaLocalPlayer::Register(L);
+	LuaCamera::Register(L);
 }
 
 void ClientScripting::on_client_ready(LocalPlayer *localplayer)
@@ -78,3 +80,8 @@ void ClientScripting::on_client_ready(LocalPlayer *localplayer)
 	lua_State *L = getStack();
 	LuaLocalPlayer::create(L, localplayer);
 }
+
+void ClientScripting::on_camera_ready(Camera *camera)
+{
+	LuaCamera::create(getStack(), camera);
+}
diff --git a/src/script/scripting_client.h b/src/script/scripting_client.h
index b3451e409..c13fde607 100644
--- a/src/script/scripting_client.h
+++ b/src/script/scripting_client.h
@@ -28,6 +28,7 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 
 class Client;
 class LocalPlayer;
+class Camera;
 class ClientScripting:
 	virtual public ScriptApiBase,
 	public ScriptApiSecurity,
@@ -36,6 +37,7 @@ class ClientScripting:
 public:
 	ClientScripting(Client *client);
 	void on_client_ready(LocalPlayer *localplayer);
+	void on_camera_ready(Camera *camera);
 
 private:
 	virtual void InitializeModApi(lua_State *L, int top);