void RenderEngine::display()
{
if(render_engine.is_done())
{
render_engine.set_gl_ortho_proj();
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glLoadIdentity();
render_engine.draw_texture();
}
else
{
glEnable(GL_DEPTH_TEST);
render_engine.set_gl_perspective();
render_engine.set_gl_clearcolor();
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glLoadIdentity();
render_engine.set_gl_camera();
render_engine.draw();
glDisable(GL_DEPTH_TEST);
}
glutSwapBuffers();
}
void RenderEngine::keyboard(unsigned char key, int x, int y)
{
// The shader to be used when rendering a material is chosen
// by setting the "illum" property of the material. This
// property is part of the MTL file format ("illum" is short
// for "illumination model"). The shader to be used with
// each illumination model is specified in the init_tracer
// function above.
//
// Number keys switch the shader used for illumination
// models 0 and 1 to the shader at the corresponding index
// in the array "shaders" at the top of this file.
//
// When you switch shaders all previous rendering results
// will be erased!
if(key >= 48 && key < 48 + static_cast<unsigned char>(render_engine.no_of_shaders()))
{
unsigned int shader_no = key - 48;
if(shader_no != render_engine.get_current_shader())
{
render_engine.set_current_shader(shader_no);
render_engine.clear_image();
render_engine.redo_display_list();
cout << "Switched to shader number " << shader_no << endl;
glutPostRedisplay();
}
}
switch(key)
{
// Use '+' and '-' to increase or decrease the number of
// jitter samples per pixel in a simple ray tracing
case '+':
render_engine.increment_pixel_subdivs();
break;
case '-':
render_engine.decrement_pixel_subdivs();
break;
// Press '*' to apply tone mapping
case '*':
render_engine.apply_tone_map();
break;
// Press '/' to unapply tone mapping
case '/':
render_engine.unapply_tone_map();
break;
// Press 'b' to save a bitmap called the same as the last loaded .obj file.
case 'b':
render_engine.save_as_bitmap();
break;
// Press 'r' to start a simple ray tracing (one pass -> done).
// To switch back to preview mode after the ray tracing is done
// press 'r' again.
case 'r':
if(render_engine.is_done())
render_engine.undo();
else
render_engine.render();
glutPostRedisplay();
break;
// Press 's' to toggle shadows on/off
case 's':
{
bool shadows_on = render_engine.toggle_shadows();
render_engine.clear_image();
render_engine.redo_display_list();
cout << "Toggled shadows " << (shadows_on ? "on" : "off") << endl;
glutPostRedisplay();
}
break;
// Press 'x' to switch on material textures.
case 'x':
render_engine.add_textures();
cout << "Toggled textures on." << endl;
break;
// Press 'z' to zoom in.
case 'z':
{
render_engine.set_focal_dist(render_engine.get_focal_dist()*1.05f);
glutPostRedisplay();
}
break;
// Press 'Z' to zoom out.
case 'Z':
{
render_engine.set_focal_dist(render_engine.get_focal_dist()/1.05f);
glutPostRedisplay();
}
break;
// Press 'SPACE' to switch between pre-view and your last tracing result.
case 32:
render_engine.undo();
glutPostRedisplay();
break;
// Press 'ESC' to exit the program.
case 27:
exit(0);
}
}