bool yoghurt::Screen::on_draw(const Cairo::RefPtr<Cairo::Context>& cr)
{
// Just call On draw listener(if it is not NULL, ofcourse).
return (on_draw_listener == NULL) ? true :
on_draw_listener(cr, get_allocated_width(), get_allocated_height());
}
// called when OpenGL context is ready and GTK widget is ready
bool Graph_disp::initiaize(const Cairo::RefPtr<Cairo::Context> & unused)
{
// clear the screen
glClearColor(bkg_color.r, bkg_color.g, bkg_color.b, 1.0f);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
display();
// init glew
if(glewInit() != GLEW_OK)
{
Gtk::MessageDialog error_dialog("Error loading Glew", false, Gtk::MESSAGE_ERROR, Gtk::BUTTONS_OK, true);
error_dialog.set_transient_for(*dynamic_cast<Gtk::Window *>(get_toplevel()));
error_dialog.set_title("Fatal Error");
error_dialog.set_secondary_text("Aborting...");
error_dialog.run();
std::cerr<<"Error loading glew. Aborting"<<std::endl;
dynamic_cast<Gtk::Window *>(get_toplevel())->hide();
return_code = EXIT_FAILURE;
return true;
}
// check for required OpenGL version
if(!GLEW_VERSION_3_3)
{
Gtk::MessageDialog error_dialog("OpenGL version too low", false, Gtk::MESSAGE_ERROR, Gtk::BUTTONS_OK, true);
error_dialog.set_transient_for(*dynamic_cast<Gtk::Window *>(get_toplevel()));
error_dialog.set_title("Fatal Error");
error_dialog.set_secondary_text("Version 3.3 required\nInstalled version is: " +
std::string((const char *)glGetString(GL_VERSION)) + "\nAborting...");
error_dialog.run();
std::cerr<<"OpenGL version too low. Version 3.3 required"<<std::endl;
std::cerr<<"Installed version is: "<<glGetString(GL_VERSION)<<std::endl;
dynamic_cast<Gtk::Window *>(get_toplevel())->hide();
return_code = EXIT_FAILURE;
return true;
}
std::cerr<<"OpenGL version is: "<<glGetString(GL_VERSION)<<std::endl;
// init GL state vars
glEnable(GL_DEPTH_TEST);
glDepthRangef(0.0f, 1.0f);
glLineWidth(5.0f);
glEnable(GL_POLYGON_SMOOTH);
glHint(GL_POLYGON_SMOOTH_HINT, GL_DONT_CARE);
glEnable(GL_LINE_SMOOTH);
glHint(GL_LINE_SMOOTH_HINT, GL_DONT_CARE);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
glBlendColor(1.0f, 1.0f, 1.0f, 0.1f);
glEnable(GL_BLEND);
// build shader programs
GLuint graph_vert = compile_shader(check_in_pwd("shaders/graph.vert"), GL_VERTEX_SHADER);
GLuint line_vert = compile_shader(check_in_pwd("shaders/line.vert"), GL_VERTEX_SHADER);
GLuint common_frag = compile_shader(check_in_pwd("shaders/common.frag"), GL_FRAGMENT_SHADER);
GLuint tex_frag = compile_shader(check_in_pwd("shaders/tex.frag"), GL_FRAGMENT_SHADER);
GLuint color_frag = compile_shader(check_in_pwd("shaders/color.frag"), GL_FRAGMENT_SHADER);
GLuint flat_color_frag = compile_shader(check_in_pwd("shaders/flat_color.frag"), GL_FRAGMENT_SHADER);
if(graph_vert == 0 || line_vert == 0 || tex_frag == 0 || color_frag == 0 || flat_color_frag == 0)
{
// error messages are displayed by the compile_shader function
Gtk::MessageDialog error_dialog("Error compiling shaders", false, Gtk::MESSAGE_ERROR, Gtk::BUTTONS_OK, true);
error_dialog.set_transient_for(*dynamic_cast<Gtk::Window *>(get_toplevel()));
error_dialog.set_title("Fatal Error");
error_dialog.set_secondary_text("See console output for details.\nAborting...");
error_dialog.run();
dynamic_cast<Gtk::Window *>(get_toplevel())->hide();
return_code = EXIT_FAILURE;
return true;
}
// link shaders
_prog_tex.prog = link_shader_prog(std::vector<GLuint> {graph_vert, tex_frag, common_frag});
_prog_color.prog = link_shader_prog(std::vector<GLuint> {graph_vert, color_frag, common_frag});
_prog_line.prog = link_shader_prog(std::vector<GLuint> {line_vert, flat_color_frag});
if(_prog_tex.prog == 0 || _prog_color.prog == 0 || _prog_line.prog == 0)
{
// error messages are displayed by the link_shader_prog function
Gtk::MessageDialog error_dialog("Error linking shaders", false, Gtk::MESSAGE_ERROR, Gtk::BUTTONS_OK, true);
error_dialog.set_transient_for(*dynamic_cast<Gtk::Window *>(get_toplevel()));
error_dialog.set_title("Fatal Error");
error_dialog.set_secondary_text("See console output for details.\nAborting...");
error_dialog.run();
dynamic_cast<Gtk::Window *>(get_toplevel())->hide();
return_code = EXIT_FAILURE;
return true;
}
check_error("build shaders");
// free shader objects
glDeleteShader(graph_vert);
glDeleteShader(line_vert);
glDeleteShader(common_frag);
glDeleteShader(tex_frag);
glDeleteShader(color_frag);
glDeleteShader(flat_color_frag);
// get uniform locations for each shader
bool uniform_success = true;
uniform_success &= _prog_tex.add_uniform("view_model_perspective");
uniform_success &= _prog_tex.add_uniform("view_model");
uniform_success &= _prog_tex.add_uniform("normal_transform");
uniform_success &= _prog_tex.add_uniform("material.shininess");
uniform_success &= _prog_tex.add_uniform("material.specular");
uniform_success &= _prog_tex.add_uniform("ambient_color");
uniform_success &= _prog_tex.add_uniform("cam_light.base.color");
uniform_success &= _prog_tex.add_uniform("cam_light.base.strength");
uniform_success &= _prog_tex.add_uniform("cam_light.pos_eye");
uniform_success &= _prog_tex.add_uniform("cam_light.const_atten");
uniform_success &= _prog_tex.add_uniform("cam_light.linear_atten");
uniform_success &= _prog_tex.add_uniform("cam_light.quad_atten");
uniform_success &= _prog_tex.add_uniform("dir_light.base.color");
uniform_success &= _prog_tex.add_uniform("dir_light.base.strength");
uniform_success &= _prog_tex.add_uniform("dir_light.dir");
uniform_success &= _prog_tex.add_uniform("dir_light.half_vec");
uniform_success &= _prog_tex.add_uniform("light_forward");
check_error("_prog_tex GetUniformLocation");
if(!uniform_success)
{
std::string missing_uniforms;
for(auto const & uniform: _prog_tex.uniforms)
{
if(uniform.second == -1)
{
missing_uniforms += uniform.first + "\n";
}
}
std::cerr<<"Error finding texture shader uniforms:\n"<<missing_uniforms<<std::endl;
Gtk::MessageDialog error_dialog("Error finding texture shader uniforms", false,
Gtk::MESSAGE_ERROR, Gtk::BUTTONS_OK, true);
error_dialog.set_transient_for(*dynamic_cast<Gtk::Window *>(get_toplevel()));
error_dialog.set_title("Fatal Error");
error_dialog.set_secondary_text(missing_uniforms + "Aborting...");
error_dialog.run();
dynamic_cast<Gtk::Window *>(get_toplevel())->hide();
return_code = EXIT_FAILURE;
return true;
}
uniform_success = true;
uniform_success &= _prog_color.add_uniform("view_model_perspective");
uniform_success &= _prog_color.add_uniform("view_model");
uniform_success &= _prog_color.add_uniform("normal_transform");
uniform_success &= _prog_color.add_uniform("material.shininess");
uniform_success &= _prog_color.add_uniform("material.specular");
uniform_success &= _prog_color.add_uniform("color");
uniform_success &= _prog_color.add_uniform("ambient_color");
uniform_success &= _prog_color.add_uniform("cam_light.base.color");
uniform_success &= _prog_color.add_uniform("cam_light.base.strength");
uniform_success &= _prog_color.add_uniform("cam_light.pos_eye");
uniform_success &= _prog_color.add_uniform("cam_light.const_atten");
uniform_success &= _prog_color.add_uniform("cam_light.linear_atten");
uniform_success &= _prog_color.add_uniform("cam_light.quad_atten");
uniform_success &= _prog_color.add_uniform("dir_light.base.color");
uniform_success &= _prog_color.add_uniform("dir_light.base.strength");
uniform_success &= _prog_color.add_uniform("dir_light.dir");
uniform_success &= _prog_color.add_uniform("dir_light.half_vec");
uniform_success &= _prog_color.add_uniform("light_forward");
check_error("_prog_color GetUniformLocation");
if(!uniform_success)
{
std::string missing_uniforms;
for(auto const & uniform: _prog_color.uniforms)
{
if(uniform.second == -1)
{
missing_uniforms += uniform.first + "\n";
}
}
std::cerr<<"Error finding color shader uniforms:\n"<<missing_uniforms<<std::endl;
Gtk::MessageDialog error_dialog("Error finding color shader uniforms", false,
Gtk::MESSAGE_ERROR, Gtk::BUTTONS_OK, true);
error_dialog.set_transient_for(*dynamic_cast<Gtk::Window *>(get_toplevel()));
error_dialog.set_title("Fatal Error");
error_dialog.set_secondary_text(missing_uniforms + "Aborting...");
error_dialog.run();
dynamic_cast<Gtk::Window *>(get_toplevel())->hide();
return_code = EXIT_FAILURE;
return true;
}
uniform_success = true;
uniform_success &= _prog_line.add_uniform("perspective");
uniform_success &= _prog_line.add_uniform("view_model");
uniform_success &= _prog_line.add_uniform("color");
check_error("_prog_line GetUniformLocation");
if(!uniform_success)
{
std::string missing_uniforms;
for(auto const & uniform: _prog_line.uniforms)
{
if(uniform.second == -1)
{
missing_uniforms += uniform.first + "\n";
}
}
std::cerr<<"Error finding line shader uniforms:\n"<<missing_uniforms<<std::endl;
Gtk::MessageDialog error_dialog("Error finding line shader uniforms", false,
Gtk::MESSAGE_ERROR, Gtk::BUTTONS_OK, true);
error_dialog.set_transient_for(*dynamic_cast<Gtk::Window *>(get_toplevel()));
error_dialog.set_title("Fatal Error");
error_dialog.set_secondary_text(missing_uniforms + "Aborting...");
error_dialog.run();
dynamic_cast<Gtk::Window *>(get_toplevel())->hide();
return_code = EXIT_FAILURE;
return true;
}
// set up un-changing lighting values (in eye space)
glm::vec3 cam_light_pos_eye(0.0f);
glm::vec3 light_forward(0.0f, 0.0f, 1.0f);
glUseProgram(_prog_tex.prog);
glUniform3fv(_prog_tex.uniforms["cam_light.pos_eye"], 1, &cam_light_pos_eye[0]);
glUniform3fv(_prog_tex.uniforms["light_forward"], 1, &light_forward[0]);
check_error("_prog_tex uniforms static");
glUseProgram(_prog_color.prog);
glUniform3fv(_prog_color.uniforms["cam_light.pos_eye"], 1, &cam_light_pos_eye[0]);
glUniform3fv(_prog_color.uniforms["light_forward"], 1, &light_forward[0]);
check_error("_prog_color uniforms static");
// create static geometry objects - cursor, axes
try
{
_cursor.build(check_in_pwd("img/cursor.png"));
}
catch(Glib::Exception &e)
{
std::cerr<<"Error reading cursor image file:"<<std::endl<<e.what()<<std::endl;
Gtk::MessageDialog error_dialog("Error reading cursor image_file", false,
Gtk::MESSAGE_ERROR, Gtk::BUTTONS_OK, true);
error_dialog.set_transient_for(*dynamic_cast<Gtk::Window *>(get_toplevel()));
error_dialog.set_title("Fatal Error");
error_dialog.set_secondary_text(e.what() + std::string("\nAborting..."));
error_dialog.run();
dynamic_cast<Gtk::Window *>(get_toplevel())->hide();
return_code = EXIT_FAILURE;
return true;
}
_axes.build();
_draw_connection.disconnect();
_draw_connection = signal_draw().connect(sigc::mem_fun(*this, &Graph_disp::draw));
// explicitly setup the window size (since resize is automatically called before initialization
Gtk::Allocation allocation(0, 0, get_allocated_width(), get_allocated_height());
resize(allocation);
_signal_initialized.emit();
return draw(unused);
}
// main input processing
bool Graph_disp::input()
{
// state vars
static std::unordered_map<sf::Keyboard::Key, bool, std::hash<int>> key_lock;
static sf::Vector2i old_mouse_pos = sf::Mouse::getPosition(glWindow);
static sf::Clock cursor_delay;
static sf::Clock zoom_delay;
// the neat thing about having this in a timeout func is that we
// don't need to calculate dt for movement controls.
// it is always (almost) exactly 10ms
// only process when the window is active and display is focused
if(dynamic_cast<Gtk::Window *>(get_toplevel())->is_active())
{
sf::Vector2i new_mouse_pos = sf::Mouse::getPosition(glWindow);
if(!has_focus() && new_mouse_pos.x >= 0 && new_mouse_pos.y >= 0 &&
new_mouse_pos.x < get_allocated_width() && new_mouse_pos.y < get_allocated_height())
{
grab_focus();
}
if(has_focus())
{
// Camera controls
float mov_scale = 0.1f;
if(sf::Keyboard::isKeyPressed(sf::Keyboard::LShift))
{
mov_scale *= 2.0f;
}
if(sf::Keyboard::isKeyPressed(sf::Keyboard::LAlt))
{
mov_scale *= 0.1f;
}
// orbiting rotational cam
if(use_orbit_cam)
{
// reset
if(sf::Keyboard::isKeyPressed(sf::Keyboard::R) && !key_lock[sf::Keyboard::R])
{
key_lock[sf::Keyboard::R] = true;
reset_cam();
}
else if(!sf::Keyboard::isKeyPressed(sf::Keyboard::R))
key_lock[sf::Keyboard::R] = false;
// tilt up
if(sf::Keyboard::isKeyPressed(sf::Keyboard::W))
{
_orbit_cam.phi += (float)M_PI / 90.0f * mov_scale;
invalidate();
}
// tilt down
if(sf::Keyboard::isKeyPressed(sf::Keyboard::S))
{
_orbit_cam.phi -= (float)M_PI / 90.0f * mov_scale;
invalidate();
}
// rotate clockwise
if(sf::Keyboard::isKeyPressed(sf::Keyboard::A))
{
_orbit_cam.theta += (float)M_PI / 90.0f * mov_scale;
invalidate();
}
// rotate counter-clockwise
if(sf::Keyboard::isKeyPressed(sf::Keyboard::D))
{
_orbit_cam.theta -= (float)M_PI / 90.0f * mov_scale;
invalidate();
}
// move camera in
if(sf::Keyboard::isKeyPressed(sf::Keyboard::Q))
{
_orbit_cam.r -= mov_scale;
invalidate();
}
// move camera out
if(sf::Keyboard::isKeyPressed(sf::Keyboard::E))
{
_orbit_cam.r += mov_scale;
invalidate();
}
// rotate w/ mouse click & drag
if(sf::Mouse::isButtonPressed(sf::Mouse::Left))
{
int d_x = new_mouse_pos.x - old_mouse_pos.x;
int d_y = new_mouse_pos.y - old_mouse_pos.y;
_orbit_cam.theta -= 0.005f * d_x;
_orbit_cam.phi -= 0.005f * d_y;
invalidate();
}
// wrap theta
if(_orbit_cam.theta > (float)M_PI * 2.0f)
_orbit_cam.theta -= (float)M_PI * 2.0f;
if(_orbit_cam.theta < 0.0f)
_orbit_cam.theta += (float)M_PI * 2.0f;
// clamp phi
if(_orbit_cam.phi > (float)M_PI)
_orbit_cam.phi = (float)M_PI;
if(_orbit_cam.phi < 0.0f)
_orbit_cam.phi = 0.0f;
}
else // free camera
{
// reset
if(sf::Keyboard::isKeyPressed(sf::Keyboard::R) && !key_lock[sf::Keyboard::R])
{
key_lock[sf::Keyboard::R] = true;
reset_cam();
}
else if(!sf::Keyboard::isKeyPressed(sf::Keyboard::R))
key_lock[sf::Keyboard::R] = false;
// move forward
if(sf::Keyboard::isKeyPressed(sf::Keyboard::W))
{
_cam.translate(mov_scale * _cam.forward());
invalidate();
}
// move backwards
if(sf::Keyboard::isKeyPressed(sf::Keyboard::S))
{
_cam.translate(-mov_scale * _cam.forward());
invalidate();
}
// move left
if(sf::Keyboard::isKeyPressed(sf::Keyboard::A))
{
_cam.translate(-mov_scale * _cam.right());
invalidate();
}
// move right
if(sf::Keyboard::isKeyPressed(sf::Keyboard::D))
{
_cam.translate(mov_scale * _cam.right());
invalidate();
}
// move up
if(sf::Keyboard::isKeyPressed(sf::Keyboard::Q))
{
_cam.translate(mov_scale * glm::vec3(0.0f, 0.0f, 1.0f));
invalidate();
}
// move down
if(sf::Keyboard::isKeyPressed(sf::Keyboard::E))
{
_cam.translate(-mov_scale * glm::vec3(0.0f, 0.0f, 1.0f));
invalidate();
}
// rotate view with mouse click & drag
if(sf::Mouse::isButtonPressed(sf::Mouse::Left))
{
int d_x = new_mouse_pos.x - old_mouse_pos.x;
int d_y = new_mouse_pos.y - old_mouse_pos.y;
_cam.rotate(0.001f * d_y, _cam.right());
_cam.rotate(0.001f * d_x, glm::vec3(0.0f, 0.0f, 1.0f));
invalidate();
}
}
const int zoom_timeout = 200;
// zoom in
if(sf::Keyboard::isKeyPressed(sf::Keyboard::Z) && zoom_delay.getElapsedTime().asMilliseconds() >= zoom_timeout)
{
_scale *= 2.0f;
zoom_delay.restart();
invalidate();
}
// zoom out
if(sf::Keyboard::isKeyPressed(sf::Keyboard::X) && zoom_delay.getElapsedTime().asMilliseconds() >= zoom_timeout)
{
_scale *= 0.5f;
zoom_delay.restart();
invalidate();
}
// move cursor with arrow keys
if(draw_cursor_flag && _active_graph)
{
const int cursor_timeout = 200;
if(sf::Keyboard::isKeyPressed(sf::Keyboard::Up) && cursor_delay.getElapsedTime().asMilliseconds() >= cursor_timeout)
{
_active_graph->move_cursor(Graph::UP);
cursor_delay.restart();
invalidate();
}
if(sf::Keyboard::isKeyPressed(sf::Keyboard::Down) && cursor_delay.getElapsedTime().asMilliseconds() >= cursor_timeout)
{
_active_graph->move_cursor(Graph::DOWN);
cursor_delay.restart();
invalidate();
}
if(sf::Keyboard::isKeyPressed(sf::Keyboard::Left) && cursor_delay.getElapsedTime().asMilliseconds() >= cursor_timeout)
{
_active_graph->move_cursor(Graph::LEFT);
cursor_delay.restart();
invalidate();
}
if(sf::Keyboard::isKeyPressed(sf::Keyboard::Right) && cursor_delay.getElapsedTime().asMilliseconds() >= cursor_timeout)
{
_active_graph->move_cursor(Graph::RIGHT);
cursor_delay.restart();
invalidate();
}
}
}
old_mouse_pos = new_mouse_pos;
}
return true;
}
