main.c

/*
    TE4 - T-Engine 4
    Copyright (C) 2009 - 2018 Nicolas Casalini

    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.

    Nicolas Casalini "DarkGod"
    darkgod@te4.org
*/
#include "display.h"
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <math.h>
#include <sys/time.h>
#include "lua.h"
#include "lauxlib.h"
#include "lualib.h"
#include "luasocket.h"
#include "luasocket/mime.h"
#include "SFMT.h"

#include "types.h"
#include "script.h"
#include "physfs.h"
#include "physfsrwops.h"
#include "core_lua.h"
#include "getself.h"
#include "music.h"
#include "serial.h"
#include "profile.h"
#include "main.h"
#include "te4web.h"
#include "lua_externs.h"
#include "runner/core.h"
#ifdef SELFEXE_WINDOWS
#include <windows.h>
#endif

#define WIDTH 800
#define HEIGHT 600
#define DEFAULT_IDLE_FPS (2)
#define WINDOW_ICON_PATH ("/engines/default/data/gfx/te4-icon.png")
#define JOY_DEADZONE 0.21

int start_xpos = -1, start_ypos = -1;
char *override_home = NULL;
int g_argc = 0;
char **g_argv;
float screen_zoom = 1;
SDL_Window *window = NULL;
SDL_Surface *windowIconSurface = NULL;
SDL_GLContext maincontext; /* Our opengl context handle */
SDL_Joystick* gamepad = NULL;
bool is_fullscreen = FALSE;
bool is_borderless = FALSE;
static lua_State *L = NULL;
int nb_cpus;
bool no_debug = FALSE;
bool safe_mode = FALSE;
int current_mousehandler = LUA_NOREF;
int current_keyhandler = LUA_NOREF;
int current_game = LUA_NOREF;
core_boot_type *core_def = NULL;
bool exit_engine = FALSE;
bool no_sound = FALSE;
bool no_steam = FALSE;
bool isActive = TRUE;
bool tickPaused = FALSE;
bool anims_paused = FALSE;
int mouse_cursor_ox, mouse_cursor_oy;
int mouse_drag_w = 32, mouse_drag_h = 32;
int mouse_drag_tex = 0, mouse_drag_tex_ref = LUA_NOREF;
int mousex = 0, mousey = 0;
float gamma_correction = 1;
int cur_frame_tick = 0;
int frame_tick_paused_time = 0;
/* The currently requested fps for the program */
int requested_fps = 30;
/* The requested fps for when the program is idle (i.e., doesn't have focus) */
int requested_fps_idle = DEFAULT_IDLE_FPS;
/* The currently "saved" fps, used for idle transitions. */
int requested_fps_idle_saved = 0;
bool forbid_idle_mode = FALSE;

SDL_TimerID display_timer_id = 0;
SDL_TimerID realtime_timer_id = 0;

/* OpenGL capabilities */
GLint max_texture_size = 1024;
extern bool shaders_active;
bool fbo_active;
bool multitexture_active;

/* Error handling */
lua_err_type *last_lua_error_head = NULL, *last_lua_error_tail = NULL;

/*
 * Locks for thread safety with respect to the rendering and realtime timers.
 * The locks are used to control access to each timer's respective id and flag.
 */
SDL_mutex *renderingLock;
SDL_mutex *realtimeLock;
int redraw_pending = 0;
int realtime_pending = 0;

/*
 * Used to clean up a lock and its corresponding timer/flag.
 *
 * @param lock
 *  The lock which is used by the timer and its event handler.
 *
 * @param timer
 *  The id of the timer to clean up.
 *
 * @param timerFlag
 *  The flag variable that timer and its events use.
 *
 */
static void cleanupTimerLock(SDL_mutex *lock, SDL_TimerID *timer, int *timerFlag);

/*
 * Handles transitions to and from idle mode.
 *
 * A transition is only performed if the game already has a running render timer
 *  and there is an actual idle->normal or normal->idle transition.
 *
 * @param goIdle
 *  Return to normal game rendering speed if zero, go idle otherwise.
 */
static void handleIdleTransition(int goIdle);

void del_lua_error()
{
	lua_err_type *cur = last_lua_error_head;
	while (cur)
	{
		if (cur->err_msg) free(cur->err_msg);
		if (cur->file) free(cur->file);
		if (cur->func) free(cur->func);

		lua_err_type *ocur = cur;
		cur = cur->next;
		free(ocur);
	}

	last_lua_error_head = NULL;
	last_lua_error_tail = NULL;
}

static void new_lua_error(const char *err)
{
	del_lua_error();

	lua_err_type *cur = calloc(1, sizeof(lua_err_type));
	cur->err_msg = strdup(err);
	cur->next = NULL;

	last_lua_error_head = cur;
	last_lua_error_tail = cur;
}

static void add_lua_error(const char *file, int line, const char *func)
{
	lua_err_type *cur = calloc(1, sizeof(lua_err_type));
	cur->err_msg = NULL;
	cur->file = strdup(file);
	cur->line = line;
	cur->func = strdup(func);
	cur->next = NULL;

	last_lua_error_tail->next = cur;
	last_lua_error_tail = cur;
}

static int traceback (lua_State *L) {
	lua_Debug ar;
	int n = 0;
	printf("Lua Error: %s\n", lua_tostring(L, 1));
	while(lua_getstack(L, n++, &ar)) {
		lua_getinfo(L, "nSl", &ar);
		printf("\tAt %s:%d %s\n", ar.short_src, ar.currentline, ar.name?ar.name:"");
	}

	// Do it again for the lua error popup, if needed
	if (1)
	{
		n = 0;
		new_lua_error(lua_tostring(L, 1));
		while(lua_getstack(L, n++, &ar)) {
			lua_getinfo(L, "nSl", &ar);
			add_lua_error(ar.short_src, ar.currentline, ar.name?ar.name:"");
		}
	}
	fflush(stdout);
	return 1;
}

void stackDump (lua_State *L) {
	int i=lua_gettop(L);
	printf(" ----------------  Stack Dump ----------------\n" );
	while(  i   ) {
		int t = lua_type(L, i);
		switch (t) {
		case LUA_TSTRING:
			printf("%d:`%s'\n", i, lua_tostring(L, i));
			break;
		case LUA_TBOOLEAN:
			printf("%d: %s\n",i,lua_toboolean(L, i) ? "true" : "false");
			break;
		case LUA_TNUMBER:
			printf("%d: %g\n",  i, lua_tonumber(L, i));
			break;
		default:
#if defined(__PTRDIFF_TYPE__)
			if((sizeof(__PTRDIFF_TYPE__) == sizeof(long int)))
			{ printf("%d: %s // %lx\n", i, lua_typename(L, t), (unsigned long int)lua_topointer(L, i)); }
			else
			{ printf("%d: %s // %x\n", i, lua_typename(L, t), (unsigned int)lua_topointer(L, i)); }
#else
			printf("%d: %s // %x\n", i, lua_typename(L, t), lua_topointer(L, i));
#endif
			break;
		}
		i--;
	}
	printf("--------------- Stack Dump Finished ---------------\n" );
	fflush(stdout);
}

int docall (lua_State *L, int narg, int nret)
{
#if 1
	int status;
	int base = lua_gettop(L) - narg;  /* function index */
//	printf("<===%d (%d)\n", base, narg);
	lua_pushcfunction(L, traceback);  /* push traceback function */
	lua_insert(L, base);  /* put it under chunk and args */
	status = lua_pcall(L, narg, nret, base);
	lua_remove(L, base);  /* remove traceback function */
	/* force a complete garbage collection in case of errors */
	if (status != 0) { lua_pop(L, 1); lua_gc(L, LUA_GCCOLLECT, 0); }
//	printf(">===%d (%d) [%d]\n", lua_gettop(L), nret, status);
	if (lua_gettop(L) != nret + (base - 1))
	{
		stackDump(L);
//		assert(0);
		lua_settop(L, base);
	}
	return status;
#else
	int status=0;
	int base = lua_gettop(L) - narg;  /* function index */
	lua_call(L, narg, nret);
	return status;
#endif
}

/* No print function, does .. nothing */
int noprint(lua_State *L)
{
	return 0;
}

// define our data that is passed to our redraw function
typedef struct {
	Uint32 color;
} MainStateData;

int event_filter(void *userdata, SDL_Event* event)
{
	// Do not allow the user to close without asking the game to know about it
	if (event->type == SDL_QUIT && (current_game != LUA_NOREF))
	{
		lua_rawgeti(L, LUA_REGISTRYINDEX, current_game);
		lua_pushstring(L, "onQuit");
		lua_gettable(L, -2);
		lua_remove(L, -2);
		lua_rawgeti(L, LUA_REGISTRYINDEX, current_game);
		docall(L, 1, 0);

		return 0;
	}
	return 1;
}

#define MIN(a,b) ((a < b) ? a : b)
#define MAX(a,b) ((a < b) ? b : a)

extern SDL_Cursor *mouse_cursor;
extern SDL_Cursor *mouse_cursor_down;
bool on_event(SDL_Event *event)
{
	switch (event->type) {
	case SDL_TEXTINPUT:
		if (current_keyhandler != LUA_NOREF)
		{
			static Uint32 lastts = 0;
			static char lastc = 0;
			if (browsers_count) { // Somehow CEF3 makes keys sometime arrive duplicated, so prevent that here
				if (event->text.timestamp == lastts) break;
				if ((event->text.timestamp - lastts < 3) && (lastc == event->text.text[0])) break;
			}
			lastts = event->text.timestamp;
			lastc = event->text.text[0];

			lua_rawgeti(L, LUA_REGISTRYINDEX, current_keyhandler);
			lua_pushstring(L, "receiveKey");
			lua_gettable(L, -2);
			lua_remove(L, -2);
			lua_rawgeti(L, LUA_REGISTRYINDEX, current_keyhandler);
			lua_pushnumber(L, 0);

			SDL_Keymod _pKeyState = SDL_GetModState();
			lua_pushboolean(L, (_pKeyState & KMOD_CTRL) ? TRUE : FALSE);
			lua_pushboolean(L, (_pKeyState & KMOD_SHIFT) ? TRUE : FALSE);
			lua_pushboolean(L, (_pKeyState & KMOD_ALT) ? TRUE : FALSE);
			lua_pushboolean(L, (_pKeyState & KMOD_GUI) ? TRUE : FALSE);

			lua_pushstring(L, event->text.text);
			lua_pushboolean(L, FALSE);
			lua_pushnil(L);
			lua_pushnil(L);
			lua_pushnumber(L, 0);

			docall(L, 11, 0);
		}
		return TRUE;
	case SDL_KEYDOWN:
	case SDL_KEYUP:
		if (current_keyhandler != LUA_NOREF)
		{
			lua_rawgeti(L, LUA_REGISTRYINDEX, current_keyhandler);
			lua_pushstring(L, "receiveKey");
			lua_gettable(L, -2);
			lua_remove(L, -2);
			lua_rawgeti(L, LUA_REGISTRYINDEX, current_keyhandler);
			lua_pushnumber(L, event->key.keysym.scancode);

			SDL_Keymod _pKeyState = SDL_GetModState();
			lua_pushboolean(L, (_pKeyState & KMOD_CTRL) ? TRUE : FALSE);
			lua_pushboolean(L, (_pKeyState & KMOD_SHIFT) ? TRUE : FALSE);
			lua_pushboolean(L, (_pKeyState & KMOD_ALT) ? TRUE : FALSE);
			lua_pushboolean(L, (_pKeyState & KMOD_GUI) ? TRUE : FALSE);

			lua_pushnil(L);
			lua_pushboolean(L, (event->type == SDL_KEYUP) ? TRUE : FALSE);

			/* Convert unicode UCS-2 to UTF8 string */
			if (event->key.keysym.sym)
			{
				wchar_t wc = event->key.keysym.sym;

				char buf[4] = {0,0,0,0};
				if (wc < 0x80)
				{
					buf[0] = wc;
				}
				else if (wc < 0x800)
				{
					buf[0] = (0xC0 | wc>>6);
					buf[1] = (0x80 | (wc & 0x3F));
				}
				else
				{
					buf[0] = (0xE0 | wc>>12);
					buf[1] = (0x80 | (wc>>6 & 0x3F));
					buf[2] = (0x80 | (wc & 0x3F));
				}

				lua_pushstring(L, buf);
			}
			else
				lua_pushnil(L);

			lua_pushnil(L);
			lua_pushnumber(L, event->key.keysym.sym);

			docall(L, 11, 0);
		}
		return TRUE;
	case SDL_MOUSEBUTTONDOWN:
	case SDL_MOUSEBUTTONUP:
		if (event->type == SDL_MOUSEBUTTONDOWN) SDL_SetCursor(mouse_cursor_down);
		else SDL_SetCursor(mouse_cursor);

		if (current_mousehandler != LUA_NOREF)
		{
			lua_rawgeti(L, LUA_REGISTRYINDEX, current_mousehandler);
			lua_pushstring(L, "receiveMouse");
			lua_gettable(L, -2);
			lua_remove(L, -2);
			lua_rawgeti(L, LUA_REGISTRYINDEX, current_mousehandler);
			switch (event->button.button)
			{
			case SDL_BUTTON_LEFT:
#if 1
				{
				SDL_Keymod _pKeyState = SDL_GetModState();
				if (_pKeyState & KMOD_ALT) lua_pushstring(L, "right");
				else lua_pushstring(L, "left");
				}
#else
				lua_pushstring(L, "left");
#endif
				break;
			case SDL_BUTTON_MIDDLE:
				lua_pushstring(L, "middle");
				break;
			case SDL_BUTTON_RIGHT:
				lua_pushstring(L, "right");
				break;
			default:
				lua_pushstring(L, "button");
				lua_pushnumber(L, event->button.button);
				lua_concat(L, 2);
				break;
			}
			lua_pushnumber(L, event->button.x / screen_zoom);
			lua_pushnumber(L, event->button.y / screen_zoom);
			lua_pushboolean(L, (event->type == SDL_MOUSEBUTTONUP) ? TRUE : FALSE);
			docall(L, 5, 0);
		}
		return TRUE;
	case SDL_MOUSEWHEEL:
		if (current_mousehandler != LUA_NOREF)
		{
			int x = 0, y = 0;
			SDL_GetMouseState(&x, &y);

			int i;
			for (i = 0; i <= 1; i++)
			{
				lua_rawgeti(L, LUA_REGISTRYINDEX, current_mousehandler);
				lua_pushstring(L, "receiveMouse");
				lua_gettable(L, -2);
				lua_remove(L, -2);
				lua_rawgeti(L, LUA_REGISTRYINDEX, current_mousehandler);
				if (event->wheel.y > 0) lua_pushstring(L, "wheelup");
				else if (event->wheel.y < 0) lua_pushstring(L, "wheeldown");
				else if (event->wheel.x > 0) lua_pushstring(L, "wheelleft");
				else if (event->wheel.x < 0) lua_pushstring(L, "wheelright");
				else lua_pushstring(L, "wheelnone");
				lua_pushnumber(L, x / screen_zoom);
				lua_pushnumber(L, y / screen_zoom);
				lua_pushboolean(L, i);
				docall(L, 5, 0);
			}
		}
		return TRUE;
	case SDL_MOUSEMOTION:
		mousex = event->motion.x / screen_zoom;
		mousey = event->motion.y / screen_zoom;

		if (current_mousehandler != LUA_NOREF)
		{
			lua_rawgeti(L, LUA_REGISTRYINDEX, current_mousehandler);
			lua_pushstring(L, "receiveMouseMotion");
			lua_gettable(L, -2);
			lua_remove(L, -2);
			lua_rawgeti(L, LUA_REGISTRYINDEX, current_mousehandler);
			if (event->motion.state & SDL_BUTTON(1)) lua_pushstring(L, "left");
			else if (event->motion.state & SDL_BUTTON(2)) lua_pushstring(L, "middle");
			else if (event->motion.state & SDL_BUTTON(3)) lua_pushstring(L, "right");
			else if (event->motion.state & SDL_BUTTON(4)) lua_pushstring(L, "wheelup");
			else if (event->motion.state & SDL_BUTTON(5)) lua_pushstring(L, "wheeldown");
			else lua_pushstring(L, "none");
			lua_pushnumber(L, event->motion.x / screen_zoom);
			lua_pushnumber(L, event->motion.y / screen_zoom);
			lua_pushnumber(L, event->motion.xrel);
			lua_pushnumber(L, event->motion.yrel);
			docall(L, 6, 0);
		}
		return TRUE;
	case SDL_FINGERDOWN:
	case SDL_FINGERUP:
		if (current_mousehandler != LUA_NOREF)
		{
			lua_rawgeti(L, LUA_REGISTRYINDEX, current_mousehandler);
			lua_pushstring(L, "receiveTouch");
			lua_gettable(L, -2);
			lua_remove(L, -2);
			lua_rawgeti(L, LUA_REGISTRYINDEX, current_mousehandler);
			lua_pushnumber(L, event->tfinger.fingerId);
			lua_pushnumber(L, event->tfinger.x / screen_zoom);
			lua_pushnumber(L, event->tfinger.y / screen_zoom);
			lua_pushnumber(L, event->tfinger.dx);
			lua_pushnumber(L, event->tfinger.dy);
			lua_pushnumber(L, event->tfinger.pressure);
			lua_pushboolean(L, (event->type == SDL_FINGERUP) ? TRUE : FALSE);
			docall(L, 8, 0);
		}
		return TRUE;
	case SDL_FINGERMOTION:
		if (current_mousehandler != LUA_NOREF)
		{
			lua_rawgeti(L, LUA_REGISTRYINDEX, current_mousehandler);
			lua_pushstring(L, "receiveTouchMotion");
			lua_gettable(L, -2);
			lua_remove(L, -2);
			lua_rawgeti(L, LUA_REGISTRYINDEX, current_mousehandler);
			lua_pushnumber(L, event->tfinger.fingerId);
			lua_pushnumber(L, event->tfinger.x / screen_zoom);
			lua_pushnumber(L, event->tfinger.y / screen_zoom);
			lua_pushnumber(L, event->tfinger.dx);
			lua_pushnumber(L, event->tfinger.dy);
			lua_pushnumber(L, event->tfinger.pressure);
			docall(L, 7, 0);
		}
		return TRUE;
	case SDL_MULTIGESTURE:
		if (current_mousehandler != LUA_NOREF)
		{
			lua_rawgeti(L, LUA_REGISTRYINDEX, current_mousehandler);
			lua_pushstring(L, "receiveTouchGesture");
			lua_gettable(L, -2);
			lua_remove(L, -2);
			lua_rawgeti(L, LUA_REGISTRYINDEX, current_mousehandler);
			lua_pushnumber(L, event->mgesture.numFingers);
			lua_pushnumber(L, event->mgesture.x / screen_zoom);
			lua_pushnumber(L, event->mgesture.y / screen_zoom);
			lua_pushnumber(L, event->mgesture.dTheta);
			lua_pushnumber(L, event->mgesture.dDist);
			docall(L, 6, 0);
		}
		return TRUE;
	case SDL_JOYAXISMOTION:
		if (current_mousehandler != LUA_NOREF)
		{
			float v = (float)event->jaxis.value / 32770;
			if (v > -JOY_DEADZONE && v < JOY_DEADZONE) return FALSE;
			lua_rawgeti(L, LUA_REGISTRYINDEX, current_mousehandler);
			lua_pushstring(L, "receiveJoyAxis");
			lua_gettable(L, -2);
			lua_remove(L, -2);
			lua_rawgeti(L, LUA_REGISTRYINDEX, current_mousehandler);
			lua_pushnumber(L, event->jaxis.axis);
			lua_pushnumber(L, MIN(1, MAX(-1, v)));
			docall(L, 3, 0);
		}
		return TRUE;
	case SDL_JOYBALLMOTION:
		if (current_mousehandler != LUA_NOREF)
		{
			lua_rawgeti(L, LUA_REGISTRYINDEX, current_mousehandler);
			lua_pushstring(L, "receiveJoyBall");
			lua_gettable(L, -2);
			lua_remove(L, -2);
			lua_rawgeti(L, LUA_REGISTRYINDEX, current_mousehandler);
			lua_pushnumber(L, event->jball.ball);
			lua_pushnumber(L, event->jball.xrel);
			lua_pushnumber(L, event->jball.yrel);
			docall(L, 4, 0);
		}
		return TRUE;
	case SDL_JOYHATMOTION:
		if (current_mousehandler != LUA_NOREF)
		{
			lua_rawgeti(L, LUA_REGISTRYINDEX, current_mousehandler);
			lua_pushstring(L, "receiveJoyHat");
			lua_gettable(L, -2);
			lua_remove(L, -2);
			lua_rawgeti(L, LUA_REGISTRYINDEX, current_mousehandler);
			lua_pushnumber(L, event->jhat.hat);
			switch (event->jhat.value) {
				case SDL_HAT_UP: lua_pushnumber(L, 8); break;
				case SDL_HAT_DOWN: lua_pushnumber(L, 2); break;
				case SDL_HAT_LEFT: lua_pushnumber(L, 4); break;
				case SDL_HAT_RIGHT: lua_pushnumber(L, 6); break;
				case SDL_HAT_LEFTUP: lua_pushnumber(L, 7); break;
				case SDL_HAT_LEFTDOWN: lua_pushnumber(L, 1); break;
				case SDL_HAT_RIGHTUP: lua_pushnumber(L, 9); break;
				case SDL_HAT_RIGHTDOWN: lua_pushnumber(L, 3); break;
			}
			docall(L, 3, 0);
		}
		return TRUE;
	case SDL_JOYBUTTONDOWN:
	case SDL_JOYBUTTONUP:
		if (current_mousehandler != LUA_NOREF)
		{
			lua_rawgeti(L, LUA_REGISTRYINDEX, current_keyhandler);
			lua_pushstring(L, "receiveJoyButton");
			lua_gettable(L, -2);
			lua_remove(L, -2);
			lua_rawgeti(L, LUA_REGISTRYINDEX, current_keyhandler);
			lua_pushnumber(L, event->jbutton.button);
			lua_pushboolean(L, event->jbutton.state == SDL_RELEASED ? TRUE : FALSE);
			docall(L, 3, 0);
		}
		return TRUE;
	}
	return FALSE;
}

// redraw the screen and update game logics, if any
void on_tick()
{
	static int Frames = 0;
	static int T0     = 0;

	if (current_game != LUA_NOREF)
	{
		lua_rawgeti(L, LUA_REGISTRYINDEX, current_game);
		lua_pushstring(L, "tick");
		lua_gettable(L, -2);
		lua_remove(L, -2);
		lua_rawgeti(L, LUA_REGISTRYINDEX, current_game);
		docall(L, 1, 1);
		tickPaused = lua_toboolean(L, -1);
		lua_pop(L, 1);
	}

	/* Gather our frames per second */
	Frames++;
	{
		int t = SDL_GetTicks();
		if (t - T0 >= 10000) {
			float seconds = (t - T0) / 1000.0;
			float fps = Frames / seconds;
//			printf("%d ticks  in %g seconds = %g TPS\n", Frames, seconds, fps);
			T0 = t;
			Frames = 0;
		}
	}
}

void call_draw(int nb_keyframes)
{
	if (draw_waiting(L)) return;

	if (nb_keyframes > 30) nb_keyframes = 30;

	// Notify the particles threads that there are new keyframes
	if (!anims_paused) thread_particle_new_keyframes(nb_keyframes);

	if (current_game != LUA_NOREF)
	{
		lua_rawgeti(L, LUA_REGISTRYINDEX, current_game);
		lua_pushstring(L, "display");
		lua_gettable(L, -2);
		lua_remove(L, -2);
		lua_rawgeti(L, LUA_REGISTRYINDEX, current_game);
		lua_pushnumber(L, (nb_keyframes < 0) ? 0 : nb_keyframes);
		docall(L, 2, 0);
	}

	/* Mouse pointer */
	if (mouse_drag_tex)
	{
		GLfloat texcoords[2*4] = {
			0, 0,
			0, 1,
			1, 1,
			1, 0,
		};
		GLfloat colors[4*4] = {
			1, 1, 1, 0.6,
			1, 1, 1, 0.6,
			1, 1, 1, 0.6,
			1, 1, 1, 0.6,
		};

		glTexCoordPointer(2, GL_FLOAT, 0, texcoords);
		glColorPointer(4, GL_FLOAT, 0, colors);

		int x = mousex;
		int y = mousey;
		int w = mouse_drag_w / 2;
		int h = mouse_drag_h / 2;
		tglBindTexture(GL_TEXTURE_2D, mouse_drag_tex);

		GLfloat vertices[2*4] = {
			x - w, y - h,
			x - w, y + h,
			x + w, y + h,
			x + w, y - h,
		};
		glVertexPointer(2, GL_FLOAT, 0, vertices);
		glDrawArrays(GL_QUADS, 0, 4);
	}
}

long total_keyframes = 0;
void on_redraw()
{
	static int Frames = 0;
	static int T0     = 0;
	static float nb_keyframes = 0;
	static int last_keyframe = 0;
	static float reference_fps = 30;
	static int count_keyframes = 0;

	/* Gather our frames per second */
	Frames++;
	if (!is_waiting()) {
		int t = SDL_GetTicks();
		if (!anims_paused) cur_frame_tick = t - frame_tick_paused_time;
		if (t - T0 >= 1000) {
			float seconds = (t - T0) / 1000.0;
			float fps = Frames / seconds;
			reference_fps = fps;
//			printf("%d frames in %g seconds = %g FPS (%d keyframes)\n", Frames, seconds, fps, count_keyframes);
			T0 = t;
			Frames = 0;
			last_keyframe = 0;
			nb_keyframes = 0;
			count_keyframes = 0;
		}
	}
	else
	{
		// If we are waiting we ignore the fact that we are losing time, this way we never try to "catch up" later
		T0 = SDL_GetTicks();
		Frames = 0;
		last_keyframe = 0;
		nb_keyframes = 0;
		count_keyframes = 0;
	}

	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
	glLoadIdentity();

	float step = 30 / reference_fps;
	nb_keyframes += step;

	int nb = ceilf(nb_keyframes);
	count_keyframes += nb - last_keyframe;
	total_keyframes += nb - last_keyframe;
//	printf("keyframes: %f / %f by %f => %d\n", nb_keyframes, reference_fps, step, nb - (last_keyframe));
	call_draw(nb - last_keyframe);

	//SDL_GL_SwapBuffers();
	SDL_GL_SwapWindow(window);

	last_keyframe = nb;

#ifdef STEAM_TE4
	if (!no_steam) te4_steam_callbacks();
#endif
#ifdef DISCORD_TE4
	extern void te4_discord_update();
	te4_discord_update();
#endif
	if (te4_web_update) te4_web_update(L);
}

void pass_command_args(int argc, char *argv[])
{
	int i;

	if (current_game != LUA_NOREF)
	{
		lua_rawgeti(L, LUA_REGISTRYINDEX, current_game);
		lua_pushstring(L, "commandLineArgs");
		lua_gettable(L, -2);
		lua_remove(L, -2);
		lua_rawgeti(L, LUA_REGISTRYINDEX, current_game);
		lua_newtable(L);

		for (i = 1; i <= argc; i++)
		{
			lua_pushnumber(L, i);
			lua_pushstring(L, argv[i]);
			lua_settable(L, -3);
		}
		docall(L, 2, 0);
	}
}

Uint32 redraw_timer(Uint32 interval, void *param)
{
	SDL_Event event;
	SDL_UserEvent userevent;

	/* In this example, our callback pushes an SDL_USEREVENT event
	 into the queue, and causes ourself to be called again at the
	 same interval: */

	userevent.type = SDL_USEREVENT;
	userevent.code = 0;
	userevent.data1 = NULL;
	userevent.data2 = NULL;

	event.type = SDL_USEREVENT;
	event.user = userevent;

	// Grab the rendering lock and see if a redraw should be requested.
	SDL_mutexP(renderingLock);
	// If there is no redraw pending, request one.  Otherwise, ignore.
	if (!redraw_pending && isActive) {
		SDL_PushEvent(&event);
		redraw_pending = 1;
	}
	SDL_mutexV(renderingLock);

	return(interval);
}

Uint32 realtime_timer(Uint32 interval, void *param)
{
	SDL_Event event;
	SDL_UserEvent userevent;

	/* In this example, our callback pushes an SDL_USEREVENT event
	 into the queue, and causes ourself to be called again at the
	 same interval: */

	userevent.type = SDL_USEREVENT;
	userevent.code = 2;
	userevent.data1 = NULL;
	userevent.data2 = NULL;

	event.type = SDL_USEREVENT;
	event.user = userevent;

	// Grab the realtime lock and see if a tick should be requested.
	SDL_mutexP(realtimeLock);
	// If there is no realtime tick pending, request one.  Otherwise, ignore.
	if (!realtime_pending && isActive) {
		SDL_PushEvent(&event);
		realtime_pending = 1;
	}
	SDL_mutexV(realtimeLock);

	return(interval);
}

// Calls the lua music callback
void on_music_stop()
{
	if (current_game != LUA_NOREF)
	{
		lua_rawgeti(L, LUA_REGISTRYINDEX, current_game);
		lua_pushstring(L, "onMusicStop");
		lua_gettable(L, -2);
		lua_remove(L, -2);
		if (lua_isfunction(L, -1))
		{
			lua_rawgeti(L, LUA_REGISTRYINDEX, current_game);
			docall(L, 1, 0);
		}
		else
			lua_pop(L, 1);
	}
}

// Setup realtime
void setupRealtime(float freq)
{
	SDL_mutexP(realtimeLock);

	if (!freq)
	{
		if (realtime_timer_id) SDL_RemoveTimer(realtime_timer_id);
		realtime_timer_id = 0;
		printf("[ENGINE] Switching to turn based\n");
	}
	else
	{
		float interval = 1000 / freq;
		if (realtime_timer_id) SDL_RemoveTimer(realtime_timer_id);
		realtime_timer_id = SDL_AddTimer((int)interval, realtime_timer, NULL);
		printf("[ENGINE] Switching to realtime, interval %d ms\n", (int)interval);
	}
	
	SDL_mutexV(realtimeLock);
	
}

void setupDisplayTimer(int fps)
{
	SDL_mutexP(renderingLock);
	
	if (display_timer_id) SDL_RemoveTimer(display_timer_id);
	requested_fps = fps;
	display_timer_id = SDL_AddTimer(1000 / fps, redraw_timer, NULL);
	printf("[ENGINE] Setting requested FPS to %d (%d ms)\n", fps, 1000 / fps);
	
	SDL_mutexV(renderingLock);

}


/* general OpenGL initialization function */
int initGL()
{
	/* Set the background black */
	tglClearColor( 0.0f, 0.0f, 0.0f, 1.0f );

	/* Depth buffer setup */
	glClearDepth( 1.0f );

	/* The Type Of Depth Test To Do */
	glDepthFunc(GL_LEQUAL);

	glEnable(GL_BLEND);
	glBlendFunc(GL_SRC_ALPHA,GL_ONE_MINUS_SRC_ALPHA);

	glEnableClientState(GL_VERTEX_ARRAY);
	glEnableClientState(GL_TEXTURE_COORD_ARRAY);
	glEnableClientState(GL_COLOR_ARRAY);

	return( TRUE );
}

int resizeWindow(int width, int height)
{
	/* Height / width ration */
	GLfloat ratio;

	SDL_GL_SetAttribute( SDL_GL_DOUBLEBUFFER, 1 );
	initGL();

	/* Protect against a divide by zero */
	if ( height == 0 )
		height = 1;

	ratio = ( GLfloat )width / ( GLfloat )height;

//	tglActiveTexture(GL_TEXTURE0);
	glEnable(GL_TEXTURE_2D);

	/* Setup our viewport. */
	glViewport( 0, 0, ( GLsizei )width, ( GLsizei )height );

	/* change to the projection matrix and set our viewing volume. */
	glMatrixMode(GL_PROJECTION);
	glLoadIdentity();

	/* Set our perspective */
	//gluPerspective( 45.0f, ratio, 0.1f, 100.0f );
	glOrtho(0, width / screen_zoom, height / screen_zoom, 0, -1001, 1001);

	/* Make sure we're chaning the model view and not the projection */
	glMatrixMode( GL_MODELVIEW );

	/* Reset The View */
	glLoadIdentity( );

//TSDL2	SDL_SetGamma(gamma_correction, gamma_correction, gamma_correction);

	glGetIntegerv(GL_MAX_TEXTURE_SIZE, &max_texture_size);
	printf("OpenGL max texture size: %d\n", max_texture_size);


	return( TRUE );
}

/* @see main.h#resizeNeedsNewWindow */
extern bool resizeNeedsNewWindow(int w, int h, bool fullscreen, bool borderless)
{
	/* Note: w and h currently not a factor */
	bool newWindowNeeded = window && ( (is_borderless && !borderless)
										|| (!is_borderless && borderless) );
	return (newWindowNeeded);
}

/* @see main.h#do_move */
void do_move(int w, int h) {
	/* Save the origin in case a window needs to be remade later. */
	start_xpos = w;
	start_ypos = h;

	/* Can't move a fullscreen SDL window in one go.*/
	if (is_fullscreen) {
		/* Drop out of fullscreen so we can move the window. */
		SDL_SetWindowFullscreen(window, SDL_FALSE);

	}

	/* Move the window */
	SDL_SetWindowPosition(window, w, h);

	/* Jump back into fullscreen if necessary */
	if (is_fullscreen) {
		if (!SDL_SetWindowFullscreen(window, SDL_TRUE)) {
			/* Fullscreen change successful */
			is_fullscreen = SDL_TRUE;

		} else {
			/* Error switching fullscreen mode */
			printf("[DO MOVE] Unable to return window"
					" to fullscreen mode:  %s\n", SDL_GetError());
			SDL_ClearError();
		}

	}