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using System;
using System.Timers;
using Gtk;
using GtkSharp;
using GtkGL;
using Tao.OpenGl;
using gl=Tao.OpenGl.Gl;
using glu=Tao.OpenGl.Glu;
// This code is based on work from Alp Toker and the NeHe lesson here:
// http://nehe.gamedev.net/data/lessons/lesson.asp?lesson=01
namespace NeHe.Lesson06
{
public class Lesson06
{
/* GlArea is the widget defined in the GtkGL namespace and is a
* specialized GtkDrawingArea with GL cow powers.
*/
GLArea glarea;
/* attrList
* Specifies a list of Boolean attributes and enum/integer
* attribute/value pairs. The last attribute must be zero or
* _GDK_GL_CONFIGS.None.
*
* See glXChooseVisual man page for explanation of
* attrList.
*
* http://www.xfree86.org/4.4.0/glXChooseVisual.3.html
*/
int[] attrlist = {
(int)GtkGL._GDK_GL_CONFIGS.Rgba,
(int)GtkGL._GDK_GL_CONFIGS.RedSize,1,
(int)GtkGL._GDK_GL_CONFIGS.GreenSize,1,
(int)GtkGL._GDK_GL_CONFIGS.BlueSize,1,
(int)GtkGL._GDK_GL_CONFIGS.DepthSize,1,
(int)GtkGL._GDK_GL_CONFIGS.Doublebuffer,
(int)GtkGL._GDK_GL_CONFIGS.None,
};
float rtri; // Angle For The Triangle
float rquad; // Angle For The Quad
// This method is called "ReSizeGLScene" in the original lesson
void OnConfigure (object o, EventArgs e)
{
if( glarea.MakeCurrent() == 0)
return;
int height = glarea.Allocation.Height,
width = glarea.Allocation.Width;
Console.WriteLine("Width: {0}", width);
Console.WriteLine("Height: {0}", height);
if (height==0) // Prevent A Divide By Zero By
{
height=1; // Making Height Equal One
}
gl.glViewport (0, 0, width, height);
gl.glMatrixMode(gl.GL_PROJECTION); // Select The Projection Matrix
gl.glLoadIdentity(); // Reset The Projection Matrix
// Calculate The Aspect Ratio Of The Window
glu.gluPerspective(45.0f,(float)width/(float)height,0.1f,100.0f);
gl.glMatrixMode(gl.GL_MODELVIEW); // Select The Modelview Matrix
gl.glLoadIdentity();
}
bool InitGL()
{
if (glarea.MakeCurrent() == 0)
return false;
gl.glShadeModel(gl.GL_SMOOTH); // Enables Smooth Shading
gl.glClearColor(0.0f, 0.0f, 0.0f, 0.0f); // Black Background
gl.glClearDepth(1.0f); // Depth Buffer Setup
gl.glEnable(gl.GL_DEPTH_TEST); // Enables Depth Testing
gl.glDepthFunc(gl.GL_LEQUAL); // The Type Of Depth Test To Do
// Really Nice Perspective Calculations
gl.glHint(gl.GL_PERSPECTIVE_CORRECTION_HINT, gl.GL_NICEST);
return true;
}
// The correct time to init the gl window is at Realize time
void OnRealized (object o, EventArgs e)
{
if(!InitGL())
Console.WriteLine("Couldn't InitGL()");
}
// This method is called "DrawGLScene" in the original lesson
void OnExposed (object o, EventArgs e)
{
if (glarea.MakeCurrent() == 0)
return;
// Clear The Screen And The Depth Buffer
gl.glClear(gl.GL_COLOR_BUFFER_BIT | gl.GL_DEPTH_BUFFER_BIT);
gl.glLoadIdentity(); // Reset The Current Modelview Matrix
gl.glTranslatef(-1.5f,0.0f,-6.0f); // Move Left 1.5 Units And Into The Screen 6.0
gl.glRotatef(rtri,0.0f,1.0f,0.0f); // Rotate The Pyramid On The Y axis
gl.glBegin(gl.GL_TRIANGLES); // Start drawing the Pyramid
gl.glColor3f(1.0f,0.0f,0.0f); // Red
gl.glVertex3f( 0.0f, 1.0f, 0.0f); // Top Of Triangle (Front)
gl.glColor3f(0.0f,1.0f,0.0f); // Green
gl.glVertex3f(-1.0f,-1.0f, 1.0f); // Left Of Triangle (Front)
gl.glColor3f(0.0f,0.0f,1.0f); // Blue
gl.glVertex3f( 1.0f,-1.0f, 1.0f); // Right Of Triangle (Front)
gl.glColor3f(1.0f,0.0f,0.0f); // Red
gl.glVertex3f( 0.0f, 1.0f, 0.0f); // Top Of Triangle (Right)
gl.glColor3f(0.0f,0.0f,1.0f); // Blue
gl.glVertex3f( 1.0f,-1.0f, 1.0f); // Left Of Triangle (Right)
gl.glColor3f(0.0f,1.0f,0.0f); // Green
gl.glVertex3f( 1.0f,-1.0f, -1.0f); // Right Of Triangle (Right)
gl.glColor3f(1.0f,0.0f,0.0f); // Red
gl.glVertex3f( 0.0f, 1.0f, 0.0f); // Top Of Triangle (Back)
gl.glColor3f(0.0f,1.0f,0.0f); // Green
gl.glVertex3f( 1.0f,-1.0f, -1.0f); // Left Of Triangle (Back)
gl.glColor3f(0.0f,0.0f,1.0f); // Blue
gl.glVertex3f(-1.0f,-1.0f, -1.0f); // Right Of Triangle (Back)
gl.glColor3f(1.0f,0.0f,0.0f); // Red
gl.glVertex3f( 0.0f, 1.0f, 0.0f); // Top Of Triangle (Left)
gl.glColor3f(0.0f,0.0f,1.0f); // Blue
gl.glVertex3f(-1.0f,-1.0f,-1.0f); // Left Of Triangle (Left)
gl.glColor3f(0.0f,1.0f,0.0f); // Green
gl.glVertex3f(-1.0f,-1.0f, 1.0f); // Right Of Triangle (Left)
gl.glEnd(); // Finished Drawing The Pyramid
gl.glLoadIdentity(); // If this didn't happen, weird rotation happens
gl.glTranslatef(1.5f,0.0f,-7.0f); // Move Right 1.5 Units And Into The Screen 6.0
gl.glRotatef(rquad,1.0f,1.0f,1.0f); // Rotate The Quad On The X axis ( NEW )
gl.glBegin(gl.GL_QUADS); // Draw a Cube
gl.glColor3f(0.0f,1.0f,0.0f); // Set The Color To Green
gl.glVertex3f( 1.0f, 1.0f,-1.0f); // Top Right Of The Quad (Top)
gl.glVertex3f(-1.0f, 1.0f,-1.0f); // Top Left Of The Quad (Top)
gl.glVertex3f(-1.0f, 1.0f, 1.0f); // Bottom Left Of The Quad (Top)
gl.glVertex3f( 1.0f, 1.0f, 1.0f); // Bottom Right Of The Quad (Top)
gl.glColor3f(1.0f,0.5f,0.0f); // Set The Color To Orange
gl.glVertex3f( 1.0f,-1.0f, 1.0f); // Top Right Of The Quad (Bottom)
gl.glVertex3f(-1.0f,-1.0f, 1.0f); // Top Left Of The Quad (Bottom)
gl.glVertex3f(-1.0f,-1.0f,-1.0f); // Bottom Left Of The Quad (Bottom)
gl.glVertex3f( 1.0f,-1.0f,-1.0f); // Bottom Right Of The Quad (Bottom)
gl.glColor3f(1.0f,0.0f,0.0f); // Set The Color To Red
gl.glVertex3f( 1.0f, 1.0f, 1.0f); // Top Right Of The Quad (Front)
gl.glVertex3f(-1.0f, 1.0f, 1.0f); // Top Left Of The Quad (Front)
gl.glVertex3f(-1.0f,-1.0f, 1.0f); // Bottom Left Of The Quad (Front)
gl.glVertex3f( 1.0f,-1.0f, 1.0f); // Bottom Right Of The Quad (Front)
gl.glColor3f(1.0f,1.0f,0.0f); // Set The Color To Yellow
gl.glVertex3f( 1.0f,-1.0f,-1.0f); // Bottom Left Of The Quad (Back)
gl.glVertex3f(-1.0f,-1.0f,-1.0f); // Bottom Right Of The Quad (Back)
gl.glVertex3f(-1.0f, 1.0f,-1.0f); // Top Right Of The Quad (Back)
gl.glVertex3f( 1.0f, 1.0f,-1.0f); // Top Left Of The Quad (Back)
gl.glColor3f(0.0f,0.0f,1.0f); // Set The Color To Blue
gl.glVertex3f(-1.0f, 1.0f, 1.0f); // Top Right Of The Quad (Left)
gl.glVertex3f(-1.0f, 1.0f,-1.0f); // Top Left Of The Quad (Left)
gl.glVertex3f(-1.0f,-1.0f,-1.0f); // Bottom Left Of The Quad (Left)
gl.glVertex3f(-1.0f,-1.0f, 1.0f); // Bottom Right Of The Quad (Left)
gl.glColor3f(1.0f,0.0f,1.0f); // Set The Color To Violet
gl.glVertex3f( 1.0f, 1.0f,-1.0f); // Top Right Of The Quad (Right)
gl.glVertex3f( 1.0f, 1.0f, 1.0f); // Top Left Of The Quad (Right)
gl.glVertex3f( 1.0f,-1.0f, 1.0f); // Bottom Left Of The Quad (Right)
gl.glVertex3f( 1.0f,-1.0f,-1.0f); // Bottom Right Of The Quad (Right)
gl.glEnd(); // Done Drawing The Cube
glarea.SwapBuffers (); // Show the newly displayed contents
}
public static int Main (string[] argc)
{
Gtk.Application.Init ();
System.Timers.Timer t = new System.Timers.Timer();
Lesson06 l = new Lesson06();
GLib.Timeout.Add (50, new GLib.TimeoutHandler (l.RotateObjects));
// Go, dog, go!
Gtk.Application.Run ();
return 1;
}
private bool RotateObjects()
{
rtri = (rtri % 360) + 1.0f;
rquad = (rquad % 360) + 0.8f;
if( glarea.MakeCurrent() == 0)
return true;
glarea.QueueDraw();
return true;
}
public Lesson06()
{
// Create a new GLArea widget and request a size
glarea = new GLArea (attrlist);
glarea.SetSizeRequest (300, 300);
// Set some event handlers
glarea.ExposeEvent += OnExposed;
glarea.Realized += OnRealized;
glarea.Unrealized += OnUnrealized;
glarea.ConfigureEvent += OnConfigure;
// Create a new Vertical Box that the GLArea can live in
VBox vb = new VBox (false, 0);
// Pack the GLArea widget into the VBox
vb.PackStart (glarea, true, true, 0);
// Create a new window and name it appropriately
Window win = new Window ("NeHe Lesson06");
// Pack the VBox into the window
win.Add (vb);
// Show all of win's contained widgets
win.ShowAll ();
}
void OnUnrealized (object o, EventArgs e)
{
Application.Quit();
}
}
}
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