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minetest/src/camera.cpp

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/*
Minetest-c55
Copyright (C) 2010-2011 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 "main.h" // for g_settings
#include "map.h"
#include "clientmap.h" // MapDrawControl
#include "mesh.h"
#include "player.h"
#include "tile.h"
#include <cmath>
#include "settings.h"
#include "itemdef.h" // For wield visualization
#include "noise.h" // easeCurve
#include "gamedef.h"
#include "sound.h"
#include "event.h"
#include "util/numeric.h"
#include "util/mathconstants.h"
Camera::Camera(scene::ISceneManager* smgr, MapDrawControl& draw_control,
IGameDef *gamedef):
m_smgr(smgr),
m_playernode(NULL),
m_headnode(NULL),
m_cameranode(NULL),
m_wieldmgr(NULL),
m_wieldnode(NULL),
m_wieldlight(0),
m_draw_control(draw_control),
m_gamedef(gamedef),
m_camera_position(0,0,0),
m_camera_direction(0,0,0),
m_aspect(1.0),
m_fov_x(1.0),
m_fov_y(1.0),
m_added_frametime(0),
m_added_frames(0),
m_range_old(0),
m_frametime_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_digging_anim(0),
m_digging_button(-1)
{
//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 = m_wieldmgr->addMeshSceneNode(createCubeMesh(v3f(1,1,1)), NULL); // need a dummy mesh
}
Camera::~Camera()
{
m_wieldnode->setMesh(NULL);
m_wieldmgr->drop();
}
bool Camera::successfullyCreated(std::wstring& error_message)
{
if (m_playernode == NULL)
{
error_message = L"Failed to create the player scene node";
return false;
}
if (m_headnode == NULL)
{
error_message = L"Failed to create the head scene node";
return false;
}
if (m_cameranode == NULL)
{
error_message = L"Failed to create the camera scene node";
return false;
}
if (m_wieldmgr == NULL)
{
error_message = L"Failed to create the wielded item scene manager";
return false;
}
if (m_wieldnode == NULL)
{
error_message = L"Failed to create the wielded item scene node";
return false;
}
return true;
}
// 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_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, v2u32 screensize,
f32 tool_reload_ratio)
{
// Get player position
// Smooth the movement when walking up stairs
v3f old_player_position = m_playernode->getPosition();
v3f player_position = player->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);
// Set head node transformation
m_headnode->setPosition(player->getEyeOffset()+v3f(0,cameratilt*-player->hurt_tilt_strength,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)
{
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 *= g_settings->getFloat("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);
// Set camera node transformation
m_cameranode->setPosition(m_camera_position);
m_cameranode->setUpVector(abs_cam_up);
// *100.0 helps in large map coordinates
m_cameranode->setTarget(m_camera_position + 100 * m_camera_direction);
// Get FOV setting
f32 fov_degrees = g_settings->getFloat("fov");
fov_degrees = MYMAX(fov_degrees, 10.0);
fov_degrees = MYMIN(fov_degrees, 170.0);
// FOV and aspect ratio
m_aspect = (f32)screensize.X / (f32) screensize.Y;
m_fov_y = fov_degrees * M_PI / 180.0;
// Increase vertical FOV on lower aspect ratios (<16:10)
m_fov_y *= MYMAX(1.0, MYMIN(1.4, sqrt(16./10. / m_aspect)));
// WTF is this? It can't be right
m_fov_x = 2 * atan(0.5 * m_aspect * tan(m_fov_y));
m_cameranode->setAspectRatio(m_aspect);
m_cameranode->setFOV(m_fov_y);
// Position the wielded item
//v3f wield_position = v3f(45, -35, 65);
v3f wield_position = v3f(55, -35, 65);
//v3f wield_rotation = v3f(-100, 120, -100);
v3f wield_rotation = v3f(-100, 120, -100);
if(m_digging_anim < 0.05 || m_digging_anim > 0.5){
f32 frac = 1.0;
if(m_digging_anim > 0.5)
frac = 2.0 * (m_digging_anim - 0.5);
// This value starts from 1 and settles to 0
f32 ratiothing = pow((1.0f - tool_reload_ratio), 0.5f);
//f32 ratiothing2 = pow(ratiothing, 0.5f);
f32 ratiothing2 = (easeCurve(ratiothing*0.5))*2.0;
wield_position.Y -= frac * 25.0 * pow(ratiothing2, 1.7f);
//wield_position.Z += frac * 5.0 * ratiothing2;
wield_position.X -= frac * 35.0 * pow(ratiothing2, 1.1f);
wield_rotation.Y += frac * 70.0 * pow(ratiothing2, 1.4f);
//wield_rotation.X -= frac * 15.0 * pow(ratiothing2, 1.4f);
//wield_rotation.Z += frac * 15.0 * pow(ratiothing2, 1.0f);
}
if (m_digging_button != -1)
{
f32 digfrac = m_digging_anim;
wield_position.X -= 50 * sin(pow(digfrac, 0.8f) * M_PI);
wield_position.Y += 24 * sin(digfrac * 1.8 * M_PI);
wield_position.Z += 25 * 0.5;
// Euler angles are PURE EVIL, so why not use quaternions?
core::quaternion quat_begin(wield_rotation * core::DEGTORAD);
core::quaternion quat_end(v3f(80, 30, 100) * core::DEGTORAD);
core::quaternion quat_slerp;
quat_slerp.slerp(quat_begin, quat_end, sin(digfrac * M_PI));
quat_slerp.toEuler(wield_rotation);
wield_rotation *= core::RADTODEG;
}
else {
f32 bobfrac = my_modf(m_view_bobbing_anim);
wield_position.X -= sin(bobfrac*M_PI*2.0) * 3.0;
wield_position.Y += sin(my_modf(bobfrac*2.0)*M_PI) * 3.0;
}
m_wieldnode->setPosition(wield_position);
m_wieldnode->setRotation(wield_rotation);
m_wieldlight = player->light;
// Render distance feedback loop
updateViewingRange(frametime);
// If the player seems to be walking on solid ground,
// view bobbing is enabled and free_move is off,
// start (or continue) the view bobbing animation.
v3f speed = player->getSpeed();
if ((hypot(speed.X, speed.Z) > BS) &&
(player->touching_ground) &&
(g_settings->getBool("view_bobbing") == true) &&
(g_settings->getBool("free_move") == false ||
!m_gamedef->checkLocalPrivilege("fly")))
{
// Start animation
m_view_bobbing_state = 1;
m_view_bobbing_speed = MYMIN(speed.getLength(), 40);
}
else if (m_view_bobbing_state == 1)
{
// Stop animation
m_view_bobbing_state = 2;
m_view_bobbing_speed = 60;
}
}
void Camera::updateViewingRange(f32 frametime_in)
{
if (m_draw_control.range_all)
return;
m_added_frametime += frametime_in;
m_added_frames += 1;
// Actually this counter kind of sucks because frametime is busytime
m_frametime_counter -= frametime_in;
if (m_frametime_counter > 0)
return;
m_frametime_counter = 0.2;
/*dstream<<__FUNCTION_NAME
<<": Collected "<<m_added_frames<<" frames, total of "
<<m_added_frametime<<"s."<<std::endl;
dstream<<"m_draw_control.blocks_drawn="
<<m_draw_control.blocks_drawn
<<", m_draw_control.blocks_would_have_drawn="
<<m_draw_control.blocks_would_have_drawn
<<std::endl;*/
// Get current viewing range and FPS settings
f32 viewing_range_min = g_settings->getS16("viewing_range_nodes_min");
viewing_range_min = MYMAX(5.0, viewing_range_min);
f32 viewing_range_max = g_settings->getS16("viewing_range_nodes_max");
viewing_range_max = MYMAX(viewing_range_min, viewing_range_max);
// Immediately apply hard limits
if(m_draw_control.wanted_range < viewing_range_min)
m_draw_control.wanted_range = viewing_range_min;
if(m_draw_control.wanted_range > viewing_range_max)
m_draw_control.wanted_range = viewing_range_max;
// Just so big a value that everything rendered is visible
// Some more allowance than viewing_range_max * BS because of clouds,
// active objects, etc.
if(viewing_range_max < 200*BS)
m_cameranode->setFarValue(200 * BS * 10);
else
m_cameranode->setFarValue(viewing_range_max * BS * 10);
f32 wanted_fps = g_settings->getFloat("wanted_fps");
wanted_fps = MYMAX(wanted_fps, 1.0);
f32 wanted_frametime = 1.0 / wanted_fps;
m_draw_control.wanted_min_range = viewing_range_min;
m_draw_control.wanted_max_blocks = (2.0*m_draw_control.blocks_would_have_drawn)+1;
if (m_draw_control.wanted_max_blocks < 10)
m_draw_control.wanted_max_blocks = 10;
f32 block_draw_ratio = 1.0;
if (m_draw_control.blocks_would_have_drawn != 0)
{
block_draw_ratio = (f32)m_draw_control.blocks_drawn
/ (f32)m_draw_control.blocks_would_have_drawn;
}
// Calculate the average frametime in the case that all wanted
// blocks had been drawn
f32 frametime = m_added_frametime / m_added_frames / block_draw_ratio;
m_added_frametime = 0.0;
m_added_frames = 0;
f32 wanted_frametime_change = wanted_frametime - frametime;
//dstream<<"wanted_frametime_change="<<wanted_frametime_change<<std::endl;
// If needed frametime change is small, just return
// This value was 0.4 for many months until 2011-10-18 by c55;
// Let's see how this works out.
if (fabs(wanted_frametime_change) < wanted_frametime*0.33)
{
//dstream<<"ignoring small wanted_frametime_change"<<std::endl;
return;
}
f32 range = m_draw_control.wanted_range;
f32 new_range = range;
f32 d_range = range - m_range_old;
f32 d_frametime = frametime - m_frametime_old;
if (d_range != 0)
{
m_time_per_range = d_frametime / d_range;
}
// The minimum allowed calculated frametime-range derivative:
// Practically this sets the maximum speed of changing the range.
// The lower this value, the higher the maximum changing speed.
// A low value here results in wobbly range (0.001)
// A high value here results in slow changing range (0.0025)
// SUGG: This could be dynamically adjusted so that when
// the camera is turning, this is lower
//f32 min_time_per_range = 0.0015;
f32 min_time_per_range = 0.0010;
//f32 min_time_per_range = 0.05 / range;
if(m_time_per_range < min_time_per_range)
{
m_time_per_range = min_time_per_range;
//dstream<<"m_time_per_range="<<m_time_per_range<<" (min)"<<std::endl;
}
else
{
//dstream<<"m_time_per_range="<<m_time_per_range<<std::endl;
}
f32 wanted_range_change = wanted_frametime_change / m_time_per_range;
// Dampen the change a bit to kill oscillations
//wanted_range_change *= 0.9;
//wanted_range_change *= 0.75;
wanted_range_change *= 0.5;
//dstream<<"wanted_range_change="<<wanted_range_change<<std::endl;
// If needed range change is very small, just return
if(fabs(wanted_range_change) < 0.001)
{
//dstream<<"ignoring small wanted_range_change"<<std::endl;
return;
}
new_range += wanted_range_change;
//f32 new_range_unclamped = new_range;
new_range = MYMAX(new_range, viewing_range_min);
new_range = MYMIN(new_range, viewing_range_max);
/*dstream<<"new_range="<<new_range_unclamped
<<", clamped to "<<new_range<<std::endl;*/
m_draw_control.wanted_range = new_range;
m_range_old = new_range;
m_frametime_old = frametime;
}
void Camera::setDigging(s32 button)
{
if (m_digging_button == -1)
m_digging_button = button;
}
void Camera::wield(const ItemStack &item)
{
IItemDefManager *idef = m_gamedef->idef();
scene::IMesh *wield_mesh = idef->getWieldMesh(item.getDefinition(idef).name, m_gamedef);
if(wield_mesh)
{
m_wieldnode->setMesh(wield_mesh);
m_wieldnode->setVisible(true);
}
else
{
m_wieldnode->setVisible(false);
}
}
void Camera::drawWieldedTool()
{
// Set vertex colors of wield mesh according to light level
u8 li = m_wieldlight;
video::SColor color(255,li,li,li);
setMeshColor(m_wieldnode->getMesh(), color);
// Clear Z buffer
m_wieldmgr->getVideoDriver()->clearZBuffer();
// Draw the wielded node (in a separate scene manager)
scene::ICameraSceneNode* cam = m_wieldmgr->getActiveCamera();
cam->setAspectRatio(m_cameranode->getAspectRatio());
cam->setFOV(72.0*M_PI/180.0);
cam->setNearValue(0.1);
cam->setFarValue(100);
m_wieldmgr->drawAll();
}
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