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Diffstat (limited to 'src/camera.cpp')
| -rw-r--r-- | src/camera.cpp | 243 |
1 files changed, 243 insertions, 0 deletions
diff --git a/src/camera.cpp b/src/camera.cpp new file mode 100644 index 000000000..30df439ed --- /dev/null +++ b/src/camera.cpp @@ -0,0 +1,243 @@ +/* +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 General Public License as published by +the Free Software Foundation; either version 2 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, write to the Free Software Foundation, Inc., +51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. +*/ + +#include "camera.h" +#include "debug.h" +#include "main.h" // for g_settings +#include "map.h" +#include "player.h" +#include "utility.h" +#include <cmath> + +Camera::Camera(scene::ISceneManager* smgr, MapDrawControl& draw_control): + m_smgr(smgr), + m_playernode(NULL), + m_cameranode(NULL), + m_draw_control(draw_control), + m_viewing_range_min(5.0), + m_viewing_range_max(5.0), + + 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_wanted_frametime(0.0), + 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_anim_left(0) +{ + dstream<<__FUNCTION_NAME<<std::endl; + + m_playernode = smgr->addEmptySceneNode(smgr->getRootSceneNode()); + m_cameranode = smgr->addCameraSceneNode(m_playernode); + + updateSettings(); +} + +Camera::~Camera() +{ +} + +void Camera::step(f32 dtime) +{ +} + +void Camera::update(LocalPlayer* player, f32 frametime, v2u32 screensize) +{ + if (m_playernode == NULL || m_cameranode == NULL) + return; + + // FOV and and aspect ratio + m_aspect = (f32)screensize.X / (f32) screensize.Y; + m_fov_x = 2 * atan(0.5 * m_aspect * tan(m_fov_y)); + m_cameranode->setAspectRatio(m_aspect); + m_cameranode->setFOV(m_fov_y); + + // Just so big a value that everything rendered is visible + // Some more allowance that m_viewing_range_max * BS because of active objects etc. + m_cameranode->setFarValue(m_viewing_range_max * BS * 10); + + m_camera_position = player->getEyePosition(); // TODO bobbing + m_cameranode->setPosition(m_camera_position); + + m_camera_direction = v3f(0,0,1); + m_camera_direction.rotateYZBy(player->getPitch()); + m_camera_direction.rotateXZBy(player->getYaw()); + // *100.0 helps in large map coordinates + m_cameranode->setTarget(m_camera_position + m_camera_direction * 100.0); + + // Render distance feedback loop + updateViewingRange(frametime); + + // Check if view bobbing is active + v3f speed = player->getSpeed(); + f32 epsilon = BS / 1000.0; + if (speed.X * speed.X + speed.Z * speed.Z > epsilon*epsilon && + speed.Y < epsilon && + g_settings.getBool("view_bobbing") == true && + g_settings.getBool("free_move") == false) + { + // The player seems to be walking on solid ground. + // Enable view bobbing. + //dstream << "View bobbing active" << std::endl; + } + else + { + //dstream << "View bobbing inactive" << std::endl; + } +} + +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; + + m_draw_control.wanted_min_range = m_viewing_range_min; + m_draw_control.wanted_max_blocks = (1.5*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 = m_wanted_frametime - frametime; + dstream<<"wanted_frametime_change="<<wanted_frametime_change<<std::endl; + + // If needed frametime change is small, just return + if (fabs(wanted_frametime_change) < m_wanted_frametime*0.4) + { + 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, m_viewing_range_min); + new_range = MYMIN(new_range, m_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::updateSettings() +{ + m_viewing_range_min = g_settings.getS16("viewing_range_nodes_min"); + m_viewing_range_min = MYMAX(5.0, m_viewing_range_min); + + m_viewing_range_max = g_settings.getS16("viewing_range_nodes_max"); + m_viewing_range_max = MYMAX(m_viewing_range_min, m_viewing_range_max); + + f32 fov_degrees = g_settings.getFloat("fov"); + fov_degrees = MYMAX(fov_degrees, 10.0); + fov_degrees = MYMIN(fov_degrees, 170.0); + m_fov_y = fov_degrees * M_PI / 180.0; + + f32 wanted_fps = g_settings.getFloat("wanted_fps"); + wanted_fps = MYMAX(wanted_fps, 1.0); + m_wanted_frametime = 1.0 / wanted_fps; +} + |