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#include "glwidget.h"
#include <QApplication>
#include <QKeyEvent>
#include <iostream>
#define SPEED 1.5
#define ROTATE_SPEED 0.0025
using namespace std;
GLWidget::GLWidget(QWidget *parent) :
QOpenGLWidget(parent),
m_deltaTimeProvider(),
m_intervalTimer(),
m_sim(),
m_camera(),
m_shader(),
m_forward(),
m_sideways(),
m_vertical(),
m_lastX(),
m_lastY(),
m_capture(false)
{
// GLWidget needs all mouse move events, not just mouse drag events
setMouseTracking(true);
// Hide the cursor since this is a fullscreen app
QApplication::setOverrideCursor(Qt::ArrowCursor);
// GLWidget needs keyboard focus
setFocusPolicy(Qt::StrongFocus);
// Function tick() will be called once per interva
connect(&m_intervalTimer, SIGNAL(timeout()), this, SLOT(tick()));
}
GLWidget::~GLWidget()
{
if (m_shader != nullptr) delete m_shader;
}
// ================== Basic OpenGL Overrides
void GLWidget::initializeGL()
{
// Initialize GL extension wrangler
glewExperimental = GL_TRUE;
GLenum err = glewInit();
if (err != GLEW_OK) fprintf(stderr, "Error while initializing GLEW: %s\n", glewGetErrorString(err));
fprintf(stdout, "Successfully initialized GLEW %s\n", glewGetString(GLEW_VERSION));
// Set clear color to white
glClearColor(1, 1, 1, 1);
// Enable depth-testing and backface culling
glEnable(GL_DEPTH_TEST);
glEnable(GL_CULL_FACE);
glCullFace(GL_BACK);
// Initialize the shader and simulation
m_shader = new Shader(":/resources/shaders/shader.vert", ":/resources/shaders/shader.frag");
m_sim.init();
// Initialize camera with a reasonable transform
Eigen::Vector3f eye = {0, 2, -5};
Eigen::Vector3f target = {0, 1, 0};
m_camera.lookAt(eye, target);
m_camera.setOrbitPoint(target);
m_camera.setPerspective(120, width() / static_cast<float>(height()), 0.1, 50);
m_deltaTimeProvider.start();
// m_intervalTimer.start(1);
// m_intervalTimer.start(1000 / 60);
m_intervalTimer.start(1000 / 120);
}
void GLWidget::paintGL()
{
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
m_shader->bind();
m_shader->setUniform("proj", m_camera.getProjection());
m_shader->setUniform("view", m_camera.getView());
m_sim.draw(m_shader);
m_shader->unbind();
}
void GLWidget::resizeGL(int w, int h)
{
glViewport(0, 0, w, h);
m_camera.setAspect(static_cast<float>(w) / h);
}
// ================== Event Listeners
void GLWidget::mousePressEvent(QMouseEvent *event)
{
m_capture = true;
m_lastX = event->position().x();
m_lastY = event->position().y();
}
void GLWidget::mouseMoveEvent(QMouseEvent *event)
{
if (!m_capture) return;
int currX = event->position().x();
int currY = event->position().y();
int deltaX = currX - m_lastX;
int deltaY = currY - m_lastY;
if (deltaX == 0 && deltaY == 0) return;
m_camera.rotate(deltaY * ROTATE_SPEED,
-deltaX * ROTATE_SPEED);
m_lastX = currX;
m_lastY = currY;
}
void GLWidget::mouseReleaseEvent(QMouseEvent *event)
{
m_capture = false;
}
void GLWidget::wheelEvent(QWheelEvent *event)
{
float zoom = 1 - event->pixelDelta().y() * 0.1f / 120.f;
m_camera.zoom(zoom);
}
void GLWidget::keyPressEvent(QKeyEvent *event)
{
if (event->isAutoRepeat()) return;
switch (event->key())
{
case Qt::Key_W: m_forward += SPEED; break;
case Qt::Key_S: m_forward -= SPEED; break;
case Qt::Key_A: m_sideways -= SPEED; break;
case Qt::Key_D: m_sideways += SPEED; break;
case Qt::Key_F: m_vertical -= SPEED; break;
case Qt::Key_R: m_vertical += SPEED; break;
case Qt::Key_C: m_camera.toggleIsOrbiting(); break;
case Qt::Key_T: m_sim.toggleWire(); break;
case Qt::Key_O: m_sim.toggleForceRender(); break;
case Qt::Key_Escape: QApplication::quit();
}
}
void GLWidget::keyReleaseEvent(QKeyEvent *event)
{
if (event->isAutoRepeat()) return;
switch (event->key())
{
case Qt::Key_W: m_forward -= SPEED; break;
case Qt::Key_S: m_forward += SPEED; break;
case Qt::Key_A: m_sideways += SPEED; break;
case Qt::Key_D: m_sideways -= SPEED; break;
case Qt::Key_F: m_vertical += SPEED; break;
case Qt::Key_R: m_vertical -= SPEED; break;
}
}
// ================== Physics Tick
void GLWidget::tick()
{
float deltaSeconds = m_deltaTimeProvider.restart() / 1000.f;
// deltaSeconds = 0.5f;
// std::cout << deltaSeconds << std::endl;
// .02 is optimal, .021 disappears after 4 for sphere
// .015 okay for ellipsoid
// .001 okay for cone
deltaSeconds = .01;
deltaSeconds = .014;
m_sim.update(deltaSeconds);
// Move camera
auto look = m_camera.getLook();
look.y() = 0;
look.normalize();
Eigen::Vector3f perp(-look.z(), 0, look.x());
Eigen::Vector3f moveVec = m_forward * look.normalized() + m_sideways * perp.normalized() + m_vertical * Eigen::Vector3f::UnitY();
moveVec *= deltaSeconds;
m_camera.move(moveVec);
// Flag this view for repainting (Qt will call paintGL() soon after)
update();
}
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