OpenGL graphics acceleration support!

CMakeLists.txt

@@ -113,3 +113,19 @@ if (SFML_FOUND)
 endif()
 
 target_link_libraries(shooter sfml-audio sfml-network sfml-graphics sfml-window sfml-system)
+
+# OpenGL part
+if (APPLE OR UNIX)
+    set(GLEW_H /usr/local/Cellar/glew/2.1.0/include/GL)
+    set(GLFW_H /usr/local/Cellar/glfw/3.2.1/include/GLFW)
+    include_directories(${GLEW_H} ${GLFW_H})
+
+    set(GLEW_LINK /usr/local/Cellar/glew/2.1.0/lib/libGLEW.2.1.dylib)
+    set(GLFW_LINK /usr/local/Cellar/glfw/3.2.1/lib/libglfw.3.dylib)
+    link_libraries(${OPENGL} ${GLEW_LINK} ${GLFW_LINK})
+
+    target_link_libraries(shooter "-framework OpenGL")
+    target_link_libraries(shooter "-framework GLUT")
+else()
+
+endif()

Player.cpp

@@ -8,7 +8,7 @@
 #include "engine/utils/Log.h"
 
 Player::Player() {
-    loadObj(ShooterConsts::CUBE_OBJ, Vec3D{0.5, 1.9, 0.5});
+    loadObj(ShooterConsts::CUBE_OBJ, Vec3D{1.5, 1.9, 1.5});
     setAcceleration(Vec3D{0, -ShooterConsts::GRAVITY, 0});
     setCollision(true);
     setVisible(false);
@@ -109,15 +109,17 @@ void Player::previousWeapon() {
     }
 }
 
-void Player::fire() {
+bool Player::fire() {
     auto camera = attached(ObjectNameTag("Camera"));
     if(camera != nullptr) {
-        auto damagedPlayers = _weapons[_selectedWeapon]->fire(_rayCastFunction, camera->position(), camera->lookAt());
+        auto fireInfo = _weapons[_selectedWeapon]->fire(_rayCastFunction, camera->position(), camera->lookAt());
-        for(auto& [damagedPlayerName, damage] : damagedPlayers) {
+        for(auto& [damagedPlayerName, damage] : fireInfo.damagedPlayers) {
             sf::Uint16 targetId = std::stoi(damagedPlayerName.str().substr(6));
             _damagePlayerCallBack(targetId, damage);
         }
+        return fireInfo.shot;
     }
+    return false;
 }
 
 void Player::reload() {

Player.h

@@ -37,7 +37,7 @@ private:
     std::function<void(std::shared_ptr<Weapon>)> _addWeaponCallBack;
     std::function<void(std::shared_ptr<Weapon>)> _removeWeaponCallBack;
 
-    std::function<std::pair<Vec3D, ObjectNameTag>(const Vec3D&, const Vec3D&)> _rayCastFunction;
+    std::function<IntersectionInformation(const Vec3D&, const Vec3D&)> _rayCastFunction;
 public:
     Player();
 
@@ -57,8 +57,10 @@ public:
 
     void nextWeapon();
     void previousWeapon();
-    void fire();
+    bool fire();
     void reload();
+    [[nodiscard]] ObjectNameTag weaponName() const { return _weapons[_selectedWeapon]->name(); }
+    std::shared_ptr<Weapon> weapon() { return _weapons[_selectedWeapon]; }
 
     void rotateWeaponsRelativePoint(const Vec3D& point, const Vec3D& v, double val);
 
@@ -83,7 +85,7 @@ public:
     void setRemoveWeaponCallBack(std::function<void(std::shared_ptr<Weapon>)> removeWeapon) {
         _removeWeaponCallBack = std::move(removeWeapon);
     }
-    void setRayCastFunction(std::function<std::pair<Vec3D, ObjectNameTag>(const Vec3D&, const Vec3D&)> rayCastFunction) {
+    void setRayCastFunction(std::function<IntersectionInformation(const Vec3D&, const Vec3D&)> rayCastFunction) {
         _rayCastFunction = std::move(rayCastFunction);
     }
 

PlayerController.cpp

@@ -9,6 +9,7 @@
 #include "engine/animation/ATranslate.h"
 #include "engine/animation/ATranslateToPoint.h"
 #include "engine/animation/Timeline.h"
+#include "engine/animation/ARotate.h"
 #include "ShooterConsts.h"
 
 PlayerController::PlayerController(std::shared_ptr<Player> player,
@@ -107,15 +108,24 @@ void PlayerController::update() {
         SoundController::playSound(SoundTag("unSlowMo"), ShooterConsts::UN_SLOW_MO_SOUND);
     }
 
+    if (Mouse::isButtonPressed(sf::Mouse::Button::Left)) {
+        bool shot = _player->fire();
+
+        if(shot) {
+            if(!_player->inCollision() && (_player->weaponName() == ObjectNameTag("shotgun")))
+                _player->addVelocity(-camera->lookAt() * 30 * coeff);
+        }
+    }
+
     if (Keyboard::isKeyPressed(sf::Keyboard::Space) && _player->inCollision()) {
         // if we just want to jump, we have to add particular speed
         if (!_isSliding)
             _player->addVelocity(Vec3D{ 0, std::abs(_player->collisionNormal().y()) * sqrt(2 * -_player->acceleration().y() * ShooterConsts::JUMP_HEIGHT) * coeff, 0 });
         // if we want to slide, we have to add speed * 60/fps to make it independent on frame rate
         else
-            _player->addVelocity(Vec3D{ 0, std::abs(_player->collisionNormal().y()) * sqrt(2 * -_player->acceleration().y() * ShooterConsts::JUMP_HEIGHT) * coeff * 60.0 / Time::fps(), 0 });
+            _player->addVelocity(Vec3D{ 0, std::abs(_player->collisionNormal().y()) * sqrt(2 * -_player->acceleration().y() * ShooterConsts::JUMP_HEIGHT) * coeff * Time::deltaTime() * 60, 0 });
 
-        _player->translate(Vec3D{ 0, Time::deltaTime() * ShooterConsts::WALK_SPEED * 2 * coeff * 60.0 / Time::fps(), 0 });
+        _player->translate(Vec3D{ 0, Time::deltaTime() * ShooterConsts::WALK_SPEED * 2 * coeff, 0 });
         _isSliding = true;
     } else {
         _isSliding = false;
@@ -149,10 +159,6 @@ void PlayerController::update() {
         _player->previousWeapon();
     }
 
-    if (Mouse::isButtonPressed(sf::Mouse::Button::Left)) {
-        _player->fire();
-    }
-
     if(Keyboard::isKeyPressed(sf::Keyboard::R)) {
         _player->reload();
     }

README.md

@@ -59,3 +59,4 @@ GamePlay:
 ![Project demonstration](img/gamePlay5.png)
 ![Project demonstration](img/gamePlay6.png)
 ![Project demonstration](img/gamePlay7.png)
+![Project demonstration](img/opengl.png)

Shooter.cpp

@@ -81,7 +81,7 @@ void Shooter::start() {
     // TODO: encapsulate call backs inside Player
     player->setAddTraceCallBack([this](const Vec3D& from, const Vec3D& to){ client->addTrace(from, to); addFireTrace(from, to); });
     player->setDamagePlayerCallBack([this] (sf::Uint16 targetId, double damage) { client->damagePlayer(targetId, damage); });
-    player->setRayCastFunction([this](const Vec3D& from, const Vec3D& to) { return world->rayCast(from, to, "Enemy"); });
+    player->setRayCastFunction([this](const Vec3D& from, const Vec3D& to) { return world->rayCast(from, to, "weapon Player"); });
     player->setTakeBonusCallBack([this] (const string& bonusName) { client->takeBonus(bonusName); });
     player->setAddWeaponCallBack([this](std::shared_ptr<Weapon> weapon){ addWeapon(std::move(weapon)); });
     player->setRemoveWeaponCallBack([this](std::shared_ptr<Weapon> weapon){ removeWeapon(std::move(weapon)); });
@@ -246,7 +246,7 @@ void Shooter::addFireTrace(const Vec3D &from, const Vec3D &to) {
     world->addBody(std::make_shared<RigidBody>(Mesh::LineTo(from, to, 0.05)), ObjectNameTag(traceName));
     world->body(ObjectNameTag(traceName))->setCollider(false);
 
-    Timeline::animate(AnimationListTag(traceName + "_fadeOut"), new AColor(world->body(ObjectNameTag(traceName)), {255, 255, 255, 0}));
+    Timeline::animate(AnimationListTag(traceName + "_fadeOut"), new AColor(world->body(ObjectNameTag(traceName)), {150, 150, 150, 0}));
     Timeline::animate(AnimationListTag(traceName + "_delete"), new AFunction([this, traceName](){ removeFireTrace(ObjectNameTag(traceName)); }, 1, 2));
 }
 
@@ -266,7 +266,7 @@ void Shooter::removeBonus(const ObjectNameTag &bonusName) {
 }
 
 void Shooter::addWeapon(std::shared_ptr<Weapon> weapon) {
-    world->addBody(weapon, weapon->name());
+    world->addBody(weapon, ObjectNameTag("weapon_" + weapon->name().str()));
 
     if(client != nullptr)
         client->changeWeapon(weapon->name().str());
@@ -294,5 +294,5 @@ void Shooter::changeEnemyWeapon(const std::string& weaponName, sf::Uint16 enemyI
 }
 
 void Shooter::removeWeapon(std::shared_ptr<Weapon> weapon) {
-    world->removeBody(ObjectNameTag(weapon->name()));
+    world->removeBody(ObjectNameTag("weapon_" + weapon->name().str()));
 }

engine/Camera.cpp

@@ -6,7 +6,6 @@
 #include "utils/Log.h"
 
 #include <cmath>
-#include "Consts.h"
 
 std::vector<std::shared_ptr<Triangle>> Camera::project(std::shared_ptr<Mesh> mesh) {
 
@@ -128,3 +127,30 @@ void Camera::clear() {
     _triangles.clear();
     _V = Matrix4x4::View(left(), up(), lookAt(), position());
 }
+
+// OpenGL function
+GLfloat *Camera::view() const {
+    auto* v = (GLfloat*)malloc(4*4*sizeof(GLfloat));
+
+    v[0] = -(GLfloat)left().x();
+    v[4] = -(GLfloat)left().y();
+    v[8] = -(GLfloat)left().z();
+    v[12] = (GLfloat)position().dot(left());
+
+    v[1] = (GLfloat)up().x();
+    v[5] = (GLfloat)up().y();
+    v[9] = (GLfloat)up().z();
+    v[13] = -(GLfloat)position().dot(up());
+
+    v[2] = -(GLfloat)lookAt().x();
+    v[6] = -(GLfloat)lookAt().y();
+    v[10] = -(GLfloat)lookAt().z();
+    v[14] = (GLfloat)position().dot(lookAt());
+
+    v[3] = (GLfloat)0.0f;
+    v[7] = (GLfloat)0.0f;
+    v[11] = (GLfloat)0.0f;
+    v[15] = (GLfloat)1.0f;
+
+    return v;
+}

engine/Camera.h

@@ -6,9 +6,9 @@
 #define ENGINE_CAMERA_H
 
 #include <vector>
-#include "Screen.h"
 #include "Plane.h"
 #include "Mesh.h"
+#include <SFML/OpenGL.hpp>
 
 class Camera final : public Object{
 private:
@@ -24,6 +24,7 @@ private:
 
     bool _ready = false;
     double _aspect = 0;
+
 public:
     Camera() = default;
     Camera(const Camera& camera) = delete;
@@ -36,6 +37,9 @@ public:
 
     [[nodiscard]] int buffSize() const { return _triangles.size(); }
     std::vector<std::shared_ptr<Triangle>> sorted();
+
+    // OpenGL function
+    [[nodiscard]] GLfloat* view() const;
 };
 
 

engine/Consts.h

@@ -13,6 +13,7 @@ namespace Consts {
     const sf::Color BACKGROUND_COLOR = sf::Color(255, 255, 255);
     const std::string PROJECT_NAME = "engine";
     const bool USE_LOG_FILE = true;
+    const bool USE_OPEN_GL = true;
 
     const double PI = 3.14159265358979323846264338327950288;
     const double EPS = 0.000001;

engine/Engine.cpp

@@ -42,11 +42,6 @@ void Engine::create(int screenWidth, int screenHeight, const std::string &name,
         Time::update();
         update();
 
-        /* Project all mesh
-         * Here we project all _tris for each body from world._objects.
-         * When we call camera.project(m.second),
-         */
-
         // sometimes we dont need to update physics world
         // (for example in menu or while pause)
         // hence we can set '_updateWorld' equal to false in setUpdateWorld(bool):
@@ -54,15 +49,30 @@ void Engine::create(int screenWidth, int screenHeight, const std::string &name,
 
             Timeline::update();
 
-            camera->clear();
             world->update();
-            world->projectObjectsInCamera(camera);
 
-            // draw projected body
+            if(_useOpenGL) {
+                GLfloat* view = camera->view();
+                for(auto & it : *world) {
+                    if (it.second->isVisible()) {
+                        GLfloat* geometry = Screen::glMeshToGLfloatArray(it.second, camera->position());
+                        screen->glDrawMesh(geometry, view, 3 * it.second->triangles().size());
+                        free(geometry);
+                    }
+                }
+                free(view);
+            } else {
+                // clear triangles from previous frame
+                camera->clear();
+                // project triangles to the camera plane
+                for(auto & it : *world)
+                    camera->project(it.second);
+                // draw triangles on the screen
                 for (auto &t : camera->sorted())
                     screen->drawTriangle(*t);
 
                 _triPerSec = camera->buffSize() * Time::fps();
+            }
 
             printDebugText();
             gui();
@@ -87,13 +97,18 @@ void Engine::exit() {
 
 void Engine::printDebugText() const {
     if (_debugText) {
-        screen->debugText(_name + "\n\n X: " +
+        std::string str = _name + "\n\n X: " +
                           std::to_string((camera->position().x())) + "\n Y: " +
                           std::to_string((camera->position().y())) + "\n Z: " +
                           std::to_string((camera->position().z())) + "\n\n" +
                           std::to_string(screen->width()) + "x" +
-                          std::to_string(screen->height()) + "\n" +
+                          std::to_string(screen->height()) + "\t" +
-                          std::to_string(Time::fps()) +
+                          std::to_string(Time::fps()) + " fps";
-                          " fps \n" + std::to_string((int) _triPerSec) + " tris/s");
+        if(_useOpenGL) {
+            str += "\n Using OpenGL acceleration";
+        } else {
+            str += "\n" + std::to_string((int) _triPerSec) + " tris/s";
+        }
+        screen->debugText(str);
     }
 }

engine/Engine.h

@@ -20,6 +20,7 @@ private:
     double _triPerSec = 0;
     bool _debugText = true;
     bool _updateWorld = true;
+    bool _useOpenGL = Consts::USE_OPEN_GL;
 
     void printDebugText() const;
 protected:
@@ -35,6 +36,7 @@ protected:
 
     void setDebugText(bool value) { _debugText = value; }
     void setUpdateWorld(bool value) { _updateWorld = value; }
+    void setGlEnable(bool value) { _useOpenGL = value; }
 
     virtual void gui(){}
 public:

engine/Mesh.h

@@ -52,7 +52,7 @@ public:
     ~Mesh() override;
 
     Mesh static Obj(const std::string& filename);
-    Mesh static LineTo(const Vec3D& from, const Vec3D& to, double line_width = 0.1, const sf::Color& color = {150, 150, 150, 255});
+    Mesh static LineTo(const Vec3D& from, const Vec3D& to, double line_width = 0.1, const sf::Color& color = {150, 150, 150, 100});
 };
 
 #endif //INC_3DZAVR_MESH_H

engine/Screen.cpp

@@ -7,6 +7,9 @@
 #include <utility>
 #include "utils/Log.h"
 #include "ResourceManager.h"
+#include <SFML/OpenGL.hpp>
+#include <cmath>
+
 
 void Screen::open(int screenWidth, int screenHeight, const std::string &name, bool verticalSync, sf::Color background, sf::Uint32 style) {
     _title = name;
@@ -15,6 +18,7 @@ void Screen::open(int screenWidth, int screenHeight, const std::string &name, bo
     _background = background;
 
     sf::ContextSettings settings;
+    settings.depthBits = 24;
     settings.antialiasingLevel = 8;
 
     _window = std::make_shared<sf::RenderWindow>();
@@ -37,6 +41,9 @@ void Screen::display() {
 }
 
 void Screen::clear() {
+    // Clear the depth buffer
+    glClear(GL_DEPTH_BUFFER_BIT | GL_COLOR_BUFFER_BIT);
+
     _window->clear(_background);
 }
 
@@ -48,7 +55,10 @@ void Screen::drawTriangle(const Triangle& triangle)
                     sf::Vertex(sf::Vector2f((float)triangle[1].x(), (float)triangle[1].y()), triangle.color()),
                     sf::Vertex(sf::Vector2f((float)triangle[2].x(), (float)triangle[2].y()), triangle.color())
             };
+
+    _window->pushGLStates();
     _window->draw(tris, 3, sf::Triangles);
+    _window->popGLStates();
 }
 
 void Screen::setTitle(const std::string& title) {
@@ -71,9 +81,11 @@ void Screen::debugText(const std::string& text) {
     t.setString(text);
     t.setCharacterSize(30);
     t.setFillColor(sf::Color::Black);
-    t.setPosition(10, 10);
+    t.setPosition(10, 50);
 
+    _window->pushGLStates();
     _window->draw(t);
+    _window->popGLStates();
 }
 
 void Screen::drawTetragon(const Vec2D &p1, const Vec2D &p2, const Vec2D &p3, const Vec2D &p4, sf::Color color) {
@@ -84,7 +96,10 @@ void Screen::drawTetragon(const Vec2D &p1, const Vec2D &p2, const Vec2D &p3, con
     polygon.setPoint(2, sf::Vector2f((float)p3.x(), (float)p3.y()));
     polygon.setPoint(3, sf::Vector2f((float)p4.x(), (float)p4.y()));
     polygon.setFillColor(color);
+
+    _window->pushGLStates();
     _window->draw(polygon);
+    _window->popGLStates();
 }
 
 void Screen::drawText(const std::string& string, const Vec2D &position, int size, sf::Color color) {
@@ -98,17 +113,125 @@ void Screen::drawText(const std::string& string, const Vec2D &position, int size
     text.setPosition((float)position.x(), (float)position.y());
 
     text.setString(string);
+
+    _window->pushGLStates();
     _window->draw(text);
+    _window->popGLStates();
 }
 
 void Screen::drawSprite(const sf::Sprite &sprite) {
+    _window->pushGLStates();
     _window->draw(sprite);
+    _window->popGLStates();
 }
 
 void Screen::drawText(const sf::Text &text) {
+    _window->pushGLStates();
     _window->draw(text);
+    _window->popGLStates();
 }
 
 void Screen::attachMouse(std::shared_ptr<Mouse> mouse) {
     mouse->setWindow(_window);
 }
+
+// OpenGL functions
+void Screen::glDrawMesh(GLfloat* geometry, GLfloat* view, size_t count) {
+    // OpenGL:
+    // Make the window the active window for OpenGL calls
+    _window->setActive(true);
+
+    glEnable(GL_CULL_FACE); // enable culling face
+    glCullFace(GL_BACK); // cull faces from back
+    glFrontFace(GL_CCW); // vertex order (counter clock wise)
+
+    // Enable Z-buffer read and write
+    glEnable(GL_DEPTH_TEST);
+    glDepthMask(GL_TRUE);
+    glClearDepth(1.f);
+
+    // Disable lighting
+    glDisable(GL_LIGHTING);
+
+    // enable alpha channel:
+    glEnable(GL_BLEND);
+    glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
+
+    // Configure the viewport (the same size as the window)
+    glViewport(0, 0, _window->getSize().x, _window->getSize().y);
+
+    // Setup a perspective projection
+    glMatrixMode(GL_PROJECTION);
+    glLoadIdentity();
+    GLfloat ratio = static_cast<float>(_window->getSize().x) / _window->getSize().y;
+    glFrustum(-ratio, ratio, -1.f, 1.f, 1.0f, 500.f);
+
+    // Enable position and texture coordinates vertex components
+    glEnableClientState(GL_VERTEX_ARRAY);
+    glEnableClientState(GL_COLOR_ARRAY);
+    glVertexPointer(3, GL_FLOAT, 7 * sizeof(GLfloat), geometry);
+    glColorPointer(4, GL_FLOAT, 7 * sizeof(GLfloat), geometry + 3);
+
+    // Disable normal and color vertex components
+    glDisableClientState(GL_NORMAL_ARRAY);
+    glDisableClientState(GL_TEXTURE_COORD_ARRAY);
+
+    // Apply some transformations
+    glMatrixMode(GL_MODELVIEW);
+    glLoadIdentity();
+
+    glLoadMatrixf(view);
+
+    // Draw the mesh
+    glDrawArrays(GL_TRIANGLES, 0, count);
+
+    // Make the window no longer the active window for OpenGL calls
+    _window->setActive(false);
+}
+
+GLfloat* Screen::glMeshToGLfloatArray(std::shared_ptr<Mesh> mesh, const Vec3D& cameraPosition) {
+    Vec3D pos = mesh->position();
+    std::vector<Triangle>& triangles = mesh->triangles();
+
+    auto* geometry = (GLfloat*)malloc(7*3*triangles.size()*sizeof(GLfloat));
+
+    for(int i = 0; i < triangles.size(); i++) {
+        int stride = 21*i;
+
+        double dot = triangles[i].norm().dot((pos + Vec3D(triangles[i][0]) - cameraPosition).normalized());
+        sf::Color color = triangles[i].color();
+        sf::Color ambientColor = sf::Color((sf::Uint8)(color.r * (0.3 * std::abs(dot) + 0.7)),
+                                           (sf::Uint8)(color.g * (0.3 * std::abs(dot) + 0.7)),
+                                           (sf::Uint8)(color.b * (0.3 * std::abs(dot) + 0.7)),
+                                           (sf::Uint8)color.a);
+
+
+        geometry[stride + 0] = (GLfloat)triangles[i][0].x() + pos.x();
+        geometry[stride + 1] = (GLfloat)triangles[i][0].y() + pos.y();
+        geometry[stride + 2] = (GLfloat)triangles[i][0].z() + pos.z();
+
+        geometry[stride + 3] = (GLfloat)ambientColor.r/255.0f;
+        geometry[stride + 4] = (GLfloat)ambientColor.g/255.0f;
+        geometry[stride + 5] = (GLfloat)ambientColor.b/255.0f;
+        geometry[stride + 6] = (GLfloat)ambientColor.a/255.0f;
+
+        geometry[stride + 7] = (GLfloat)triangles[i][1].x() + pos.x();
+        geometry[stride + 8] = (GLfloat)triangles[i][1].y() + pos.y();
+        geometry[stride + 9] = (GLfloat)triangles[i][1].z() + pos.z();
+
+        geometry[stride + 10] = (GLfloat)ambientColor.r/255.0f;
+        geometry[stride + 11] = (GLfloat)ambientColor.g/255.0f;
+        geometry[stride + 12] = (GLfloat)ambientColor.b/255.0f;
+        geometry[stride + 13] = (GLfloat)ambientColor.a/255.0f;
+
+        geometry[stride + 14] = (GLfloat)triangles[i][2].x() + pos.x();
+        geometry[stride + 15] = (GLfloat)triangles[i][2].y() + pos.y();
+        geometry[stride + 16] = (GLfloat)triangles[i][2].z() + pos.z();
+
+        geometry[stride + 17] = (GLfloat)ambientColor.r/255.0f;
+        geometry[stride + 18] = (GLfloat)ambientColor.g/255.0f;
+        geometry[stride + 19] = (GLfloat)ambientColor.b/255.0f;
+        geometry[stride + 20] = (GLfloat)ambientColor.a/255.0f;
+    }
+    return geometry;
+}

engine/Screen.h

@@ -13,6 +13,8 @@
 #include "utils/Time.h"
 #include "Mouse.h"
 #include "Consts.h"
+#include "Mesh.h"
+#include "Camera.h"
 
 class Screen final {
 private:
@@ -29,7 +31,7 @@ public:
 
     void display();
     void clear();
-    bool hasFocus() const { return _window->hasFocus(); }
+    [[nodiscard]] bool hasFocus() const { return _window->hasFocus(); }
 
     void drawTriangle(const Triangle& triangle);
     void drawTetragon(const Vec2D& p1, const Vec2D& p2, const Vec2D& p3, const Vec2D& p4, sf::Color color);
@@ -50,6 +52,10 @@ public:
     void debugText(const std::string& text);
 
     void attachMouse(std::shared_ptr<Mouse> mouse);
+
+    // OpenGL functions
+    void glDrawMesh(GLfloat* geometry, GLfloat* view, size_t count);
+    static GLfloat* glMeshToGLfloatArray(std::shared_ptr<Mesh> mesh, const Vec3D& cameraPosition);
 };
 
 

engine/World.cpp

@@ -6,6 +6,8 @@
 #include "utils/Log.h"
 #include "Plane.h"
 #include "ResourceManager.h"
+#include <sstream>
+#include <cmath>
 
 using namespace std;
 
@@ -19,15 +21,28 @@ void World::loadBody(const ObjectNameTag& tag, const string &filename, const Vec
     Log::log("World::loadBody(): inserted body from " + filename + " with title '" + tag.str() + "' with " + std::to_string(_objects[tag]->triangles().size()) + " tris.");
 }
 
-std::pair<Vec3D, ObjectNameTag> World::rayCast(const Vec3D& from, const Vec3D& to, const std::string& tag) {
+IntersectionInformation World::rayCast(const Vec3D& from, const Vec3D& to, const std::string& skipTags) {
 
-    std::pair<Vec3D, string> result;
+    // make vector of tags, that we are going to escape
+    vector <string> tagsToSkip;
+    stringstream s(skipTags);
+    std::string t;
+    while (s >> t) tagsToSkip.push_back(t);
+
+    bool intersected = false;
     std::unique_ptr<Vec3D> point = std::make_unique<Vec3D>();
+    std::unique_ptr<Triangle> triangle = std::make_unique<Triangle>();
     std::string bodyName;
     double minDistance = Consts::RAY_CAST_MAX_DISTANCE;
+    std::shared_ptr<RigidBody> intersectedBody = nullptr;
 
     for(auto& [name, body]  : _objects) {
-        if(!tag.empty() && name.str().find(tag) == std::string::npos)
+
+        //for (auto& escapeTag : tagsToSkip)
+        //    if(name.str().find(escapeTag) != std::string::npos)
+        //        continue;
+
+        if(name.str().find("Player") != std::string::npos || name.str().find("weapon") != std::string::npos)
             continue;
 
         for(auto& tri : body->triangles()) {
@@ -39,11 +54,14 @@ std::pair<Vec3D, ObjectNameTag> World::rayCast(const Vec3D& from, const Vec3D& t
             if(intersection.second > 0 && distance < minDistance && tri_translated.isPointInside(intersection.first)) {
                 minDistance = distance;
                 point = std::make_unique<Vec3D>(intersection.first);
+                triangle = std::make_unique<Triangle>(tri_translated);
                 bodyName = name.str();
+                intersected = true;
+                intersectedBody = body;
             }
         }
     }
-    return {*point, ObjectNameTag(bodyName)};
+    return IntersectionInformation{*point, sqrt(minDistance), *triangle, ObjectNameTag(bodyName), intersectedBody, intersected};
 }
 
 void World::loadMap(const std::string& filename, const Vec3D& scale) {
@@ -53,6 +71,8 @@ void World::loadMap(const std::string& filename, const Vec3D& scale) {
         addBody(std::make_shared<RigidBody>(*objs[i]), meshName);
         body(meshName)->scale(scale);
     }
+
+    auto it = _objects.begin();
 }
 
 void World::removeBody(const ObjectNameTag& tag) {
@@ -95,11 +115,6 @@ void World::update() {
     }
 }
 
-void World::projectObjectsInCamera(std::shared_ptr<Camera> camera) {
-    for (auto &[name, body] : _objects)
-        camera->project(body);
-}
-
 std::shared_ptr<RigidBody> World::body(const ObjectNameTag& tag) {
     if(_objects.count(tag) == 0)
         return nullptr;

engine/World.h

@@ -7,8 +7,18 @@
 
 #include <map>
 #include "Camera.h"
+#include "Screen.h"
 #include "physics/RigidBody.h"
 
+struct IntersectionInformation final {
+    const Vec3D pointOfIntersection;
+    const double distanceToObject;
+    const Triangle intersectedTriangle;
+    const ObjectNameTag objectName;
+    const std::shared_ptr<RigidBody> obj;
+    const bool intersected;
+};
+
 class World final {
 private:
     std::map<ObjectNameTag, std::shared_ptr<RigidBody>> _objects;
@@ -17,19 +27,19 @@ public:
 
     void checkCollision(const ObjectNameTag& tag);
     void update();
-    void projectObjectsInCamera(std::shared_ptr<Camera> camera);
 
     void addBody(std::shared_ptr<RigidBody> mesh, const ObjectNameTag& tag);
     std::shared_ptr<RigidBody> body(const ObjectNameTag& tag);
     void removeBody(const ObjectNameTag& tag);
     void loadBody(const ObjectNameTag& tag, const std::string &filename, const Vec3D& scale = Vec3D{1, 1, 1});
 
-    // rayCast returns pair of Point4D and std::string:
+    // std::string skipTags is a string that consist of all objects we want to skip in ray casting
-    // 1) Point4D is point of collision
+    IntersectionInformation rayCast(const Vec3D& from, const Vec3D& to, const std::string& skipTags = "");
-    // 2) std::string - title of the object
-    std::pair<Vec3D, ObjectNameTag> rayCast(const Vec3D& from, const Vec3D& to, const std::string& tag = "");
 
     void loadMap(const std::string& filename, const Vec3D & scale = Vec3D{1, 1, 1});
+
+    std::map<ObjectNameTag, std::shared_ptr<RigidBody>>::iterator begin() { return _objects.begin(); }
+    std::map<ObjectNameTag, std::shared_ptr<RigidBody>>::iterator end() { return _objects.end(); }
 };
 
 

weapon/Ak47.cpp

@@ -8,7 +8,7 @@
 
 using namespace std;
 
-Ak47::Ak47(int ammo, const std::string& weaponName) : Weapon(weaponName, ShooterConsts::AK47_OBJ, Vec3D{3, 3, 3}, Vec3D{-0.8, 1.3, 0.3}, Vec3D{0, Consts::PI, 0}) {
+Ak47::Ak47(int ammo, const std::string& weaponName) : Weapon(weaponName, ShooterConsts::AK47_OBJ, Vec3D{3, 3, 3}, Vec3D{-2.2, 1.0, 1.3}, Vec3D{0, Consts::PI, 0}) {
     fireSound = ShooterConsts::AK47_FIRE_SOUND;
     reloadSound = ShooterConsts::AK47_RELOAD_SOUND;
 

weapon/Gold_Ak47.h

@@ -10,7 +10,7 @@
 
 class Gold_Ak47 final : public Weapon {
 public:
-    explicit Gold_Ak47(int ammo = 200, const std::string& weaponName = "gold_ak47") : Weapon(weaponName, ShooterConsts::GOLD_AK47_OBJ, Vec3D{3, 3, 3}, Vec3D{-0.8, 1.3, 0.3}, Vec3D{0, Consts::PI, 0}) {
+    explicit Gold_Ak47(int ammo = 200, const std::string& weaponName = "gold_ak47") : Weapon(weaponName, ShooterConsts::GOLD_AK47_OBJ, Vec3D{3, 3, 3}, Vec3D{-2.2, 1.0, 1.3}, Vec3D{0, Consts::PI, 0}) {
         fireSound = ShooterConsts::GOLD_AK47_FIRE_SOUND;
         reloadSound = ShooterConsts::GOLD_AK47_RELOAD_SOUND;
 

weapon/Gun.cpp

@@ -8,7 +8,7 @@
 
 using namespace std;
 
-Gun::Gun(int ammo, const std::string& weaponName) : Weapon(weaponName, ShooterConsts::GUN_OBJ, Vec3D{3, 3, 3}, Vec3D{-0.8, 1.3, 0.3}, Vec3D{0, Consts::PI, 0}) {
+Gun::Gun(int ammo, const std::string& weaponName) : Weapon(weaponName, ShooterConsts::GUN_OBJ, Vec3D{3, 3, 3}, Vec3D{-1.8, 1.3, 1.8}, Vec3D{0, Consts::PI, 0}) {
     fireSound = ShooterConsts::GUN_FIRE_SOUND;
     reloadSound = ShooterConsts::GUN_RELOAD_SOUND;
 

weapon/Rifle.cpp

@@ -6,7 +6,7 @@
 #include "Rifle.h"
 #include "../ShooterConsts.h"
 
-Rifle::Rifle(int ammo, const std::string &weaponName) : Weapon(weaponName, ShooterConsts::RIFLE_OBJ, Vec3D{3, 3, 3}, Vec3D{-1.2, 1, 0.3}, Vec3D{0, Consts::PI, 0}) {
+Rifle::Rifle(int ammo, const std::string &weaponName) : Weapon(weaponName, ShooterConsts::RIFLE_OBJ, Vec3D{3, 3, 3}, Vec3D{-2.3, 1, 1.3}, Vec3D{0, Consts::PI, 0}) {
     fireSound = ShooterConsts::RIFLE_FIRE_SOUND;
     reloadSound = ShooterConsts::RIFLE_RELOAD_SOUND;
 

weapon/Shotgun.cpp

@@ -9,7 +9,7 @@
 
 using namespace std;
 
-Shotgun::Shotgun(int ammo, const std::string& weaponName) : Weapon(weaponName, ShooterConsts::SHOTGUN_OBJ, Vec3D{3, 3, 3}, Vec3D{-0.95, 1.3, -0.6}, Vec3D{0, Consts::PI, 0}) {
+Shotgun::Shotgun(int ammo, const std::string& weaponName) : Weapon(weaponName, ShooterConsts::SHOTGUN_OBJ, Vec3D{3, 3, 3}, Vec3D{-1.95, 0.8, 1.5}, Vec3D{0, Consts::PI, 0}) {
     fireSound = ShooterConsts::SHOTGUN_FIRE_SOUND;
     reloadSound = ShooterConsts::SHOTGUN_RELOAD_SOUND;
 
@@ -25,7 +25,7 @@ Shotgun::Shotgun(int ammo, const std::string& weaponName) : Weapon(weaponName, S
 }
 
 std::map<ObjectNameTag, double>
-Shotgun::processFire(std::function<std::pair<Vec3D, ObjectNameTag>(const Vec3D&, const Vec3D&)> rayCastFunction, const Vec3D& position, const Vec3D& direction) {
+Shotgun::processFire(std::function<IntersectionInformation(const Vec3D&, const Vec3D&)> rayCastFunction, const Vec3D& position, const Vec3D& direction) {
     std::map<ObjectNameTag, double> damagedPlayers;
 
     for(int i = 0; i < 15; i++) {

weapon/Shotgun.h

@@ -10,7 +10,7 @@
 class Shotgun final : public Weapon {
 public:
     explicit Shotgun(int ammo = 15, const std::string& weaponName = "shotgun");
-    std::map<ObjectNameTag, double> processFire(std::function<std::pair<Vec3D, ObjectNameTag>(const Vec3D&, const Vec3D&)> rayCastFunction, const Vec3D& position, const Vec3D& direction) override;
+    std::map<ObjectNameTag, double> processFire(std::function<IntersectionInformation(const Vec3D&, const Vec3D&)> rayCastFunction, const Vec3D& position, const Vec3D& direction) override;
 };
 
 

weapon/Weapon.cpp

@@ -21,7 +21,7 @@ Weapon::Weapon(const std::string& weaponName, const std::string& objFileName, co
     translate(t);
 }
 
-std::map<ObjectNameTag, double> Weapon::fire(std::function<std::pair<Vec3D, ObjectNameTag>(const Vec3D&, const Vec3D&)> rayCastFunction, const Vec3D& position, const Vec3D& direction) {
+FireInformation Weapon::fire(std::function<IntersectionInformation(const Vec3D&, const Vec3D&)> rayCastFunction, const Vec3D& position, const Vec3D& direction) {
     if(_clipAmmo == 0) {
         reload();
         if(_clipAmmo == 0)
@@ -29,7 +29,7 @@ std::map<ObjectNameTag, double> Weapon::fire(std::function<std::pair<Vec3D, Obje
     }
 
     if(_clipAmmo <= 0 || std::abs(Time::time() - _lastFireTime) < _fireDelay || std::abs(Time::time() - _lastReloadTime) < _reloadTime)
-        return std::map<ObjectNameTag, double>();
+        return FireInformation{std::map<ObjectNameTag, double>(), false};
 
     _lastFireTime = Time::time();
     _clipAmmo--;
@@ -37,7 +37,7 @@ std::map<ObjectNameTag, double> Weapon::fire(std::function<std::pair<Vec3D, Obje
     SoundController::playSound(SoundTag("fire"), fireSound);
     Log::log("Weapon::fire (" + std::to_string(_stockAmmo) + " : " + std::to_string(_clipAmmo) + ")");
 
-    return processFire(std::move(rayCastFunction), position, direction);
+    return FireInformation{processFire(std::move(rayCastFunction), position, direction), true};
 }
 
 void Weapon::reload() {
@@ -56,11 +56,11 @@ void Weapon::reload() {
     _lastReloadTime = Time::time();
 }
 
-std::map<ObjectNameTag, double> Weapon::processFire(std::function<std::pair<Vec3D, ObjectNameTag>(const Vec3D&, const Vec3D&)> rayCastFunction, const Vec3D& position, const Vec3D& direction) {
+std::map<ObjectNameTag, double> Weapon::processFire(std::function<IntersectionInformation(const Vec3D&, const Vec3D&)> rayCastFunction, const Vec3D& position, const Vec3D& direction) {
     return addTrace(std::move(rayCastFunction), position, direction);
 }
 
-std::map<ObjectNameTag, double> Weapon::addTrace(std::function<std::pair<Vec3D, ObjectNameTag>(const Vec3D&, const Vec3D&)> rayCastFunction, const Vec3D& from, const Vec3D& directionTo) {
+std::map<ObjectNameTag, double> Weapon::addTrace(std::function<IntersectionInformation(const Vec3D&, const Vec3D&)> rayCastFunction, const Vec3D& from, const Vec3D& directionTo) {
     std::map<ObjectNameTag, double> damagedPlayers;
 
     double spreading = _spreading*ShooterConsts::FIRE_DISTANCE/100;
@@ -70,13 +70,12 @@ std::map<ObjectNameTag, double> Weapon::addTrace(std::function<std::pair<Vec3D,
 
     // damage player
     auto rayCast = rayCastFunction(from, from + directionTo * ShooterConsts::FIRE_DISTANCE + randV);
-    if(rayCast.second.str().find("Enemy") != std::string::npos) {
+    if(rayCast.objectName.str().find("Enemy") != std::string::npos)
-        damagedPlayers[rayCast.second] += _damage/(1.0 + (from - rayCast.first).abs());
+        damagedPlayers[rayCast.objectName] += _damage/(1.0 + rayCast.distanceToObject);
-    }
 
     // add trace line
     Vec3D lineFrom = position() + Vec3D(triangles().back()[0]);
-    Vec3D lineTo = rayCast.first == Vec3D(0) ? position() + -lookAt() * ShooterConsts::FIRE_DISTANCE + randV: rayCast.first;
+    Vec3D lineTo = rayCast.intersected ? rayCast.pointOfIntersection : position() + -lookAt() * ShooterConsts::FIRE_DISTANCE + randV;
     _addTraceCallBack(lineFrom, lineTo);
 
     return damagedPlayers;

weapon/Weapon.h

@@ -15,6 +15,11 @@
 #include "../engine/SoundController.h"
 #include "../engine/Consts.h"
 
+struct FireInformation {
+    const std::map<ObjectNameTag, double> damagedPlayers;
+    const bool shot;
+};
+
 class Weapon : public RigidBody {
 protected:
     int _initialPack = 100; // how much ammo do you have when you find the weapon
@@ -39,14 +44,14 @@ protected:
 
     std::function<void(const Vec3D&, const Vec3D&)> _addTraceCallBack;
 
-    std::map<ObjectNameTag, double> addTrace(std::function<std::pair<Vec3D, ObjectNameTag>(const Vec3D&, const Vec3D&)> rayCastFunction, const Vec3D& position, const Vec3D& direction);
+    std::map<ObjectNameTag, double> addTrace(std::function<IntersectionInformation(const Vec3D&, const Vec3D&)> rayCastFunction, const Vec3D& position, const Vec3D& direction);
 
-    virtual std::map<ObjectNameTag, double> processFire(std::function<std::pair<Vec3D, ObjectNameTag>(const Vec3D&, const Vec3D&)> rayCastFunction, const Vec3D& position, const Vec3D& direction);
+    virtual std::map<ObjectNameTag, double> processFire(std::function<IntersectionInformation(const Vec3D&, const Vec3D&)> rayCastFunction, const Vec3D& position, const Vec3D& direction);
 
 public:
     Weapon(const std::string& weaponName, const std::string& objFileName, const Vec3D& scale, const Vec3D& translate, const Vec3D& rotate);
 
-    std::map<ObjectNameTag, double> fire(std::function<std::pair<Vec3D, ObjectNameTag>(const Vec3D&, const Vec3D&)> rayCastFunction, const Vec3D& position, const Vec3D& direction);
+    FireInformation fire(std::function<IntersectionInformation(const Vec3D&, const Vec3D&)> rayCastFunction, const Vec3D& position, const Vec3D& direction);
     void reload();
 
     [[nodiscard]] std::pair<double, double> balance() const{ return std::make_pair(_clipAmmo, _stockAmmo); }