108 lines
3.8 KiB
C++
108 lines
3.8 KiB
C++
//
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// This source code is property of the Computer Graphics and Visualization
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// chair of the TU Dresden. Do not distribute in modified or unmodified form!
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// Copyright (C) 2016 CGV TU Dresden - All Rights Reserved
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//
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/*************************************************************************
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The main program.
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This class provides the functionality of the main program. The program
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starts after calling the "run" method. This method initializes the GLUT
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system for rendering (using OpenGL) and user interaction. During the
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initialization process different methods are connected to certain events
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such as "display the window content" or "act on key events".
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Furthermore the main context menu is initialized by calling the method
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"setup_context_menu".
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Whenever one of the events described above occurs the appropriate functions
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are called (They are however not called directly but via static functions
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that forward the event. Read the included PDF if you are interested why
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this is done and how it works).
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The actual rendering happens in the "display" method that completely
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handles the rendering over to the "render" method of the "content"-variable
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which is an instance of a child class of abstract_scene.
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For animations a timer is set up to call the "timer" method every 1/30 sec
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which calls the "advance_frame" method of the current "content" and
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refreshes the display.
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**************************************************************************/
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#pragma once
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// Needed for openGL rendering and GLUT commands
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#include "GL/glut.h"
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// Needed for displaying text in the main window
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#include "GL/freeglut_ext.h"
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// Contains the interface for abstract_scene
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#include "abstract_scene.h"
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// An enumeration of menu actions. Whenever something
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// from the context menu is selected the method "context_menu_select"
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// is invoked with an element of this enumeration as a parameter
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enum MenuActions
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{
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MA_CUBE_SYSTEM, // Render the cube system
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MA_CUBE_SYSTEM_SPLIT, // Render the cube system in split screen
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MA_CUBES_RECURSIVE, // Render the recursive cubes
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MA_TERRAIN, // Render the terrain
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MA_TERRAIN_SOLID, // Show the terrain as solid
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MA_TERRAIN_WIREFRAME, // Show the terrain as wireframe
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MA_TERRAIN_LEVELS, // Show height level lines
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MA_EXAMPLE_PRIMITIVES, // Render the primitives example
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MA_EXAMPLE_CPRIMITIVES, // Render the consecutive primitives example
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MA_EXAMPLE_3D_PRIMITIVES, // Render the 3D primitives example
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MA_EXAMPLE_TRANS_ORDER // Render the transformation order example
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};
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class application
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{
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public:
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// Initialize all non-GLUT related variables
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application();
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// Run the program using the command line arguments
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int run(int argc, char* argv[]);
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private:
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// The current scene to display
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abstract_scene *content;
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// States for the terrain scene
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bool terrain_solid, terrain_wireframe, terrain_levels;
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// Dirty flag to check if the menu must be updated
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bool menu_dirty;
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// The static instance of this program. Read the PDF for more details
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static application *instance;
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// Set the current scene
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void set_content(abstract_scene *new_content);
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// The event method on key presses
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void key_down(unsigned char key, int x, int y);
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// The event method on context menu selections
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void context_menu_select(int item);
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// The event method on timer callbacks
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void timer(int value);
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// The event method on window content rendering
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void display();
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// Initialize the context menu
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void setup_context_menu();
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// Update the context menu according to the settings
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void update_context_menu();
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// Static callbacks...
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static void key_down_callback(unsigned char key, int x, int y);
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static void context_menu_callback(int item);
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static void display_callback();
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static void timer_callback(int value);
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static void idle_callback();
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};
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