games/minimal/mods/default/textures/crack_anylength.png

/*
Minetest
Copyright (C) 2010-2013 celeron55, Perttu Ahola <celeron55@gmail.com>

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/

#include "camera.h"
#include "debug.h"
#include "client.h"
#include "map.h"
#include "clientmap.h"     // MapDrawControl
#include "player.h"
#include <cmath>
#include "settings.h"
#include "wieldmesh.h"
#include "noise.h"         // easeCurve
#include "gamedef.h"
#include "sound.h"
#include "event.h"
#include "profiler.h"
#include "util/numeric.h"
#include "util/mathconstants.h"
#include "constants.h"

#define CAMERA_OFFSET_STEP 200

#include "nodedef.h"

Camera::Camera(scene::ISceneManager* smgr, MapDrawControl& draw_control,
		IGameDef *gamedef):
	m_playernode(NULL),
	m_headnode(NULL),
	m_cameranode(NULL),

	m_wieldmgr(NULL),
	m_wieldnode(NULL),

	m_draw_control(draw_control),
	m_gamedef(gamedef),

	m_camera_position(0,0,0),
	m_camera_direction(0,0,0),
	m_camera_offset(0,0,0),

	m_aspect(1.0),
	m_fov_x(1.0),
	m_fov_y(1.0),

	m_added_busytime(0),
	m_added_frames(0),
	m_range_old(0),
	m_busytime_old(0),
	m_frametime_counter(0),
	m_time_per_range(30. / 50), // a sane default of 30ms per 50 nodes of range

	m_view_bobbing_anim(0),
	m_view_bobbing_state(0),
	m_view_bobbing_speed(0),
	m_view_bobbing_fall(0),

	m_digging_anim(0),
	m_digging_button(-1),

	m_wield_change_timer(0.125),
	m_wield_item_next(),

	m_camera_mode(CAMERA_MODE_FIRST)
{
	//dstream<<__FUNCTION_NAME<<std::endl;

	// note: making the camera node a child of the player node
	// would lead to unexpected behaviour, so we don't do that.
	m_playernode = smgr->addEmptySceneNode(smgr->getRootSceneNode());
	m_headnode = smgr->addEmptySceneNode(m_playernode);
	m_cameranode = smgr->addCameraSceneNode(smgr->getRootSceneNode());
	m_cameranode->bindTargetAndRotation(true);

	// This needs to be in its own scene manager. It is drawn after
	// all other 3D scene nodes and before the GUI.
	m_wieldmgr = smgr->createNewSceneManager();
	m_wieldmgr->addCameraSceneNode();
	m_wieldnode = new WieldMeshSceneNode(m_wieldmgr->getRootSceneNode(), m_wieldmgr, -1, true);
	m_wieldnode->setItem(ItemStack(), m_gamedef);
	m_wieldnode->drop(); // m_wieldmgr grabbed it
	m_wieldlightnode = m_wieldmgr->addLightSceneNode(NULL, v3f(0.0, 50.0, 0.0));

	/* TODO: Add a callback function so these can be updated when a setting
	 *       changes.  At this point in time it doesn't matter (e.g. /set
	 *       is documented to change server settings only)
	 *
	 * TODO: Local caching of settings is not optimal and should at some stage
	 *       be updated to use a global settings object for getting thse values
	 *       (as opposed to the this local caching). This can be addressed in
	 *       a later release.
	 */
	m_cache_fall_bobbing_amount = g_settings->getFloat("fall_bobbing_amount");
	m_cache_view_bobbing_amount = g_settings->getFloat("view_bobbing_amount");
	m_cache_wanted_fps          = g_settings->getFloat("wanted_fps");
	m_cache_fov                 = g_settings->getFloat("fov");
	m_cache_view_bobbing        = g_settings->getBool("view_bobbing");
}

Camera::~Camera()
{
	m_wieldmgr->drop();
}

bool Camera::successfullyCreated(std::string &error_message)
{
	if (!m_playernode) {
		error_message = "Failed to create the player scene node";
	} else if (!m_headnode) {
		error_message = "Failed to create the head scene node";
	} else if (!m_cameranode) {
		error_message = "Failed to create the camera scene node";
	} else if (!m_wieldmgr) {
		error_message = "Failed to create the wielded item scene manager";
	} else if (!m_wieldnode) {
		error_message = "Failed to create the wielded item scene node";
	} else {
		error_message.clear();
	}
	return error_message.empty();
}

// Returns the fractional part of x
inline f32 my_modf(f32 x)
{
	double dummy;
	return modf(x, &dummy);
}

void Camera::step(f32 dtime)
{
	if(m_view_bobbing_fall > 0)
	{
		m_view_bobbing_fall -= 3 * dtime;
		if(m_view_bobbing_fall <= 0)
			m_view_bobbing_fall = -1; // Mark the effect as finished
	}

	bool was_under_zero = m_wield_change_timer < 0;
	m_wield_change_timer = MYMIN(m_wield_change_timer + dtime, 0.125);

	if (m_wield_change_timer >= 0 && was_under_zero)
		m_wieldnode->setItem(m_wield_item_next, m_gamedef);

	if (m_view_bobbing_state != 0)
	{
		//f32 offset = dtime * m_view_bobbing_speed * 0.035;
		f32 offset = dtime * m_view_bobbing_speed * 0.030;
		if (m_view_bobbing_state == 2)
		{
#if 0
			// Animation is getting turned off
			if (m_view_bobbing_anim < 0.5)
				m_view_bobbing_anim -= offset;
			else
				m_view_bobbing_anim += offset;
			if (m_view_bobbing_anim <= 0 || m_view_bobbing_anim >= 1)
			{
				m_view_bobbing_anim = 0;
				m_view_bobbing_state = 0;
			}
#endif
#if 1
			// Animation is getting turned off
			if(m_view_bobbing_anim < 0.25)
			{
				m_view_bobbing_anim -= offset;
			} else if(m_view_bobbing_anim > 0.75) {
				m_view_bobbing_anim += offset;
			}
			if(m_view_bobbing_anim < 0.5)
			{
				m_view_bobbing_anim += offset;
				if(m_view_bobbing_anim > 0.5)
					m_view_bobbing_anim = 0.5;
			} else {
				m_view_bobbing_anim -= offset;
				if(m_view_bobbing_anim < 0.5)
					m_view_bobbing_anim = 0.5;
			}
			if(m_view_bobbing_anim <= 0 || m_view_bobbing_anim >= 1 ||
					fabs(m_view_bobbing_anim - 0.5) < 0.01)
			{
				m_view_bobbing_anim = 0;
				m_view_bobbing_state = 0;
			}
#endif
		}
		else
		{
			float was = m_view_bobbing_anim;
			m_view_bobbing_anim = my_modf(m_view_bobbing_anim + offset);
			bool step = (was == 0 ||
					(was < 0.5f && m_view_bobbing_anim >= 0.5f) ||
					(was > 0.5f && m_view_bobbing_anim <= 0.5f));
			if(step)
			{
				MtEvent *e = new SimpleTriggerEvent("ViewBobbingStep");
				m_gamedef->event()->put(e);
			}
		}
	}

	if (m_digging_button != -1)
	{
		f32 offset = dtime * 3.5;
		float m_digging_anim_was = m_digging_anim;
		m_digging_anim += offset;
		if (m_digging_anim >= 1)
		{
			m_digging_anim = 0;
			m_digging_button = -1;
		}
		float lim = 0.15;
		if(m_digging_anim_was < lim && m_digging_anim >= lim)
		{
			if(m_digging_button == 0)
			{
				MtEvent *e = new SimpleTriggerEvent("CameraPunchLeft");
				m_gamedef->event()->put(e);
			} else if(m_digging_button == 1) {
				MtEvent *e = new SimpleTriggerEvent("CameraPunchRight");
				m_gamedef->event()->put(e);
			}
		}
	}
}

void Camera::update(LocalPlayer* player, f32 frametime, f32 busytime,
		f32 tool_reload_ratio, ClientEnvironment &c_env)
{
	// Get player position
	// Smooth the movement when walking up stairs
	v3f old_player_position = m_playernode->getPosition();
	v3f player_position = player->getPosition();
	if (player->isAttached && player->parent)
		player_position = player->parent->getPosition();
	//if(player->touching_ground && player_position.Y > old_player_position.Y)
	if(player->touching_ground &&
			player_position.Y > old_player_position.Y)
	{
		f32 oldy = old_player_position.Y;
		f32 newy = player_position.Y;
		f32 t = exp(-23*frametime);
		player_position.Y = oldy * t + newy * (1-t);
	}

	// Set player node transformation
	m_playernode->setPosition(player_position);
	m_playernode->setRotation(v3f(0, -1 * player->getYaw(), 0));
	m_playernode->updateAbsolutePosition();

	// Get camera tilt timer (hurt animation)
	float cameratilt = fabs(fabs(player->hurt_tilt_timer-0.75)-0.75);

	// Fall bobbing animation
	float fall_bobbing = 0;
	if(player->camera_impact >= 1 && m_camera_mode < CAMERA_MODE_THIRD)
	{
		if(m_view_bobbing_fall == -1) // Effect took place and has finished
			player->camera_impact = m_view_bobbing_fall = 0;
		else if(m_view_bobbing_fall == 0) // Initialize effect
			m_view_bobbing_fall = 1;

		// Convert 0 -> 1 to 0 -> 1 -> 0
		fall_bobbing = m_view_bobbing_fall < 0.5 ? m_view_bobbing_fall * 2 : -(m_view_bobbing_fall - 0.5) * 2 + 1;
		// Smoothen and invert the above
		fall_bobbing = sin(fall_bobbing * 0.5 * M_PI) * -1;
		// Amplify according to the intensity of the impact
		fall_bobbing *= (1 - rangelim(50 / player->camera_impact, 0, 1)) * 5;

		fall_bobbing *= m_cache_fall_bobbing_amount;
	}

	// Calculate players eye offset for different camera modes
	v3f PlayerEyeOffset = player->getEyeOffset();
	if (m_camera_mode == CAMERA_MODE_FIRST)
		PlayerEyeOffset += player->eye_offset_first;
	else
		PlayerEyeOffset += player->eye_offset_third;

	// Set head node transformation
	m_headnode->setPosition(PlayerEyeOffset+v3f(0,cameratilt*-player->hurt_tilt_strength+fall_bobbing,0));
	m_headnode->setRotation(v3f(player->getPitch(), 0, cameratilt*player->hurt_tilt_strength));
	m_headnode->updateAbsolutePosition();

	// Compute relative camera position and target
	v3f rel_cam_pos = v3f(0,0,0);
	v3f rel_cam_target = v3f(0,0,1);
	v3f rel_cam_up = v3f(0,1,0);

	if (m_view_bobbing_anim != 0 && m_camera_mode < CAMERA_MODE_THIRD)
	{
		f32 bobfrac = my_modf(m_view_bobbing_anim * 2);
		f32 bobdir = (m_view_bobbing_anim < 0.5) ? 1.0 : -1.0;

		#if 1
		f32 bobknob = 1.2;
		f32 bobtmp = sin(pow(bobfrac, bobknob) * M_PI);
		//f32 bobtmp2 = cos(pow(bobfrac, bobknob) * M_PI);

		v3f bobvec = v3f(
			0.3 * bobdir * sin(bobfrac * M_PI),
			-0.28 * bobtmp * bobtmp,
			0.);

		//rel_cam_pos += 0.2 * bobvec;
		//rel_cam_target += 0.03 * bobvec;
		//rel_cam_up.rotateXYBy(0.02 * bobdir * bobtmp * M_PI);
		float f = 1.0;
		f *= m_cache_view_bobbing_amount;
		rel_cam_pos += bobvec * f;
		//rel_cam_target += 0.995 * bobvec * f;
		rel_cam_target += bobvec * f;
		rel_cam_target.Z -= 0.005 * bobvec.Z * f;
		//rel_cam_target.X -= 0.005 * bobvec.X * f;
		//rel_cam_target.Y -= 0.005 * bobvec.Y * f;
		rel_cam_up.rotateXYBy(-0.03 * bobdir * bobtmp * M_PI * f);
		#else
		f32 angle_deg = 1 * bobdir * sin(bobfrac * M_PI);
		f32 angle_rad = angle_deg * M_PI / 180;
		f32 r = 0.05;
		v3f off = v3f(
			r * sin(angle_rad),
			r * (cos(angle_rad) - 1),
			0);
		rel_cam_pos += off;
		//rel_cam_target += off;
		rel_cam_up.rotateXYBy(angle_deg);
		#endif

	}

	// Compute absolute camera position and target
	m_headnode->getAbsoluteTransformation().transformVect(m_camera_position, rel_cam_pos);
	m_headnode->getAbsoluteTransformation().rotateVect(m_camera_direction, rel_cam_target - rel_cam_pos);

	v3f abs_cam_up;
	m_headnode->getAbsoluteTransformation().rotateVect(abs_cam_up, rel_cam_up);

	// Seperate camera position for calculation
	v3f my_cp = m_camera_position;

	// Reposition the camera for third person view
	if (m_camera_mode > CAMERA_MODE_FIRST)
	{
		if (m_camera_mode == CAMERA_MODE_THIRD_FRONT)
			m_camera_direction *= -1;

		my_cp.Y += 2;

		// Calculate new position
		bool abort = false;
		for (int i = BS; i <= BS*2.75; i++)
		{
			my_cp.X = m_camera_position.X + m_camera_direction.X*-i;
			my_cp.Z = m_camera_position.Z + m_camera_direction.Z*-i;
			if (i > 12)
				my_cp.Y = m_camera_position.Y + (m_camera_direction.Y*-i);

			// Prevent camera positioned inside nodes
ofs	hex dump	ascii
0000	89 50 4e 47 0d 0a 1a 0a 00 00 00 0d 49 48 44 52 00 00 00 10 00 00 00 50 08 06 00 00 00 10 ab f5	.PNG........IHDR.......P........
0020	0d 00 00 00 01 73 52 47 42 00 ae ce 1c e9 00 00 00 06 62 4b 47 44 00 ff 00 ff 00 ff a0 bd a7 93	.....sRGB.........bKGD..........
0040	00 00 00 09 70 48 59 73 00 00 0b 13 00 00 0b 13 01 00 9a 9c 18 00 00 00 07 74 49 4d 45 07 dc 06	....pHYs.................tIME...
0060	10 11 2f 04 7e e4 e1 f8 00 00 00 ef 49 44 41 54 58 c3 ed 57 cb 0e c3 20 0c 83 69 df bd 83 91 fa	../.~.......IDATX..W......i.....
0080	db de a5 9a 10 e2 99 a4 94 4e e4 06 22 21 24 b6 01 e7 b6 ad 6f 4c c6 87 c4 91 23 8e e9 2e b4 3e	.........N.."!$.....oL....#....>
00a0	82 c8 8e 65 82 6c 7b a4 a1 67 d1 6b 26 95 bb b3 aa 05 e1 19 e4 17 e8 5d 71 f4 ce b9 10 05 09 e7	...e.l{..g.k&..........]q.......
00c0	5c b3 70 cc ec 78 9d 1e b4 ba 10 34 a2 02 4b 65 c2 e6 d5 0d 34 a6 45 07 70 39 8c 25 82 02 49 2d	\.p..x.....4..Ke....4.E.p9.%..I-
00e0	52 48 17 19 9a c3 3e 22 27 f6 64 c3 01 3d 40 69 c2 9c 85 b4 70 a4 a4 8d de 12 07 de 02 99 0f be	RH....>"'.d..=@i....p...........
0100	91 ab 73 69 11 3f 9a de bb c2 45 2a 7e bd aa af f7 5c 06 1c 2d 5e 49 0f 38 45 0f 72 19 a0 16 80	..si.?....E*~....\..-^I.8E.r....
0120	85 4c 20 05 d0 ba 7a 20 3e 92 ba 1e 73 5e 2b 50 d2 bc 9b 7d 68 91 a8 d5 42 fe a1 1e f0 0e 3d a0	.L....z.>...s^+P...}h...B.....=.
0140	85 1e c0 44 0f 6a 9c bf 5e 0f 46 7e 6b 43 c7 62 07 c4 c5 7c a7 f6 eb 1b e2 c1 17 3f f1 86 84 4a	...D.j..^.F~kC.b...\|.......?...J
0160	4a 02 5e 00 00 00 00 49 45 4e 44 ae 42 60 82	J.^....IEND.B`.