I have been working on a side-scrolling 2D demo that uses glOrtho2D(). On the screen are four rectangles (Box user-datatype) with three shaped as long rectangles (Box1, Box2, Box3), and the player object (PC) is shaped as a red square, all using glRectf(). I decided it’s time to apply a simple 50x50 texture onto the PC object. Everything executes, but the texture doesn’t show up. I know the texture is found due to some testing. How do I mount my texture onto my 50x50 rectangle using glRectf()? I’m assuming my small understanding of texturing is what’s causing the problem. It could be a simple mistake. Please let me know, thanks!
Form1.cs:
#region Using Clauses
using System;
using System.IO;
using System.Drawing;
using System.Drawing.Imaging;
using System.Windows.Forms;
using Tao.OpenGl;
using Tao.FreeGlut;
using Tao.OpenAl;
#endregion
namespace Form_Practice
{
public partial class Form1 : Form
{
private static bool[] keys = new bool[256];
private Tao.Platform.Windows.SimpleOpenGlControl cntrl;
private System.Timers.Timer timer1;
Box PC, Box1, Box2, Box3;
private const float speed = 0.7f;
private bool active = true;
private int[] texture = new int[1];
public Form1()
{
InitializeComponent();
this.ClientSize = new Size(800, 600);
cntrl.KeyDown += new KeyEventHandler(cntrl_KeyDown);
cntrl.KeyUp += new KeyEventHandler(cntrl_KeyUp);
cntrl.Click += new EventHandler(cntrl_Click);
this.Activated += new EventHandler(Form1_Activated);
this.Deactivate += new EventHandler(Form1_Deactivate);
PC = new Box(350, 200, 50, 50, 1.0f, 0.0f, 0.0f);
Box1 = new Box(50, 50, 550, 50, 0.0f, 1.0f, 0.0f);
Box2 = new Box(50, 300, 550, 50, 0.0f, 1.0f, 0.0f);
Box3 = new Box(550, 300, 50, 900, 0.0f, 1.0f, 0.0f);
}
/// <summary>
/// Window closed, deallocate files here.
/// </summary>
/// <param name="e"></param>
protected override void OnClosed(EventArgs e)
{
base.OnClosed(e);
}
/// <summary>
/// Window Deactivated
/// </summary>
void Form1_Deactivate(object sender, EventArgs e)
{
this.active = false;
}
/// <summary>
/// Window Activated
/// </summary>
void Form1_Activated(object sender, EventArgs e)
{
this.active = true;
}
/// <summary>
/// Submit Button
/// </summary>
private void btnSubmit_Click(object sender, EventArgs e)
{
}
/// <summary>
/// OpenGL control clicked for focus
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
void cntrl_Click(object sender, EventArgs e)
{
cntrl.Focus();
}
/// <summary>
/// Key Up on OpenGL Control
/// </summary>
void cntrl_KeyUp(object sender, KeyEventArgs e)
{
base.OnKeyDown(e);
keys[e.KeyValue] = false;
}
/// <summary>
/// Key Down on OpenGL Control
/// </summary>
void cntrl_KeyDown(object sender, KeyEventArgs e)
{
base.OnKeyDown(e);
keys[e.KeyValue] = true;
}
/// <summary>
/// Initializes OpenGL Control
/// </summary>
private void cntrl_Load(object sender, System.EventArgs e)
{
if (!LoadGLTextures())
Application.Exit();
this.cntrl.InitializeContexts();
Gl.glEnable(Gl.GL_TEXTURE_2D);
Gl.glShadeModel(Gl.GL_SMOOTH);
Gl.glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
Gl.glHint(Gl.GL_PERSPECTIVE_CORRECTION_HINT, Gl.GL_NICEST);
Reshape(null, null);
}
/// <summary>
/// Timer1 Elapsed Time
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void timer1_Elapsed(object sender, System.Timers.ElapsedEventArgs e)
{
this.cntrl.Invalidate();
}
/// <summary>
/// Loads all OpenGL Textures.
/// </summary>
/// <returns></returns>
public bool LoadGLTextures()
{
Bitmap[] textureImage = new Bitmap[1];
bool status = false;
textureImage[0] = Utilities.LoadBitmap("NeHe.Lesson06.NeHe.bmp");
if (textureImage[0] != null)
{
status = true;
Gl.glGenTextures(1, out texture[0]);
textureImage[0].RotateFlip(RotateFlipType.RotateNoneFlipY);
Rectangle rectangle = new Rectangle(0, 0, textureImage[0].Width,
textureImage[0].Height);
BitmapData bitmapData = textureImage[0].LockBits(rectangle,
ImageLockMode.ReadOnly, PixelFormat.Format24bppRgb);
Gl.glBindTexture(Gl.GL_TEXTURE_2D, texture[0]);
Gl.glTexImage2D(Gl.GL_TEXTURE_2D, 0, Gl.GL_RGB8, textureImage[0].Width,
textureImage[0].Height, 0, Gl.GL_BGR, Gl.GL_UNSIGNED_BYTE, bitmapData.Scan0);
Gl.glTexParameteri(Gl.GL_TEXTURE_2D, Gl.GL_TEXTURE_MIN_FILTER, Gl.GL_LINEAR);
Gl.glTexParameteri(Gl.GL_TEXTURE_2D, Gl.GL_TEXTURE_MAG_FILTER, Gl.GL_LINEAR);
if (textureImage[0] != null)
{
textureImage[0].UnlockBits(bitmapData);
textureImage[0].Dispose();
}
}
return status;
}
/// <summary>
/// OpenGL Control Reshape
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
public void Reshape(object sender, EventArgs e)
{
if (cntrl.Height == 0)
cntrl.Height = 1;
Gl.glViewport(0, 0, cntrl.Width, cntrl.Height);
Gl.glMatrixMode(Gl.GL_PROJECTION);
Gl.glLoadIdentity();
Glu.gluOrtho2D(0.0, cntrl.Width, cntrl.Height, 0.0);
Gl.glMatrixMode(Gl.GL_MODELVIEW);
Gl.glLoadIdentity();
}
/// <summary>
/// OpenGL Control Paint
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
public void cntrl_Paint(object sender, PaintEventArgs e)
{
Gl.glClear(Gl.GL_COLOR_BUFFER_BIT);
Gl.glLoadIdentity();
if (!active)
return;
GetInput();
Gl.glBindTexture(Gl.GL_TEXTURE_2D, texture[0]);
Gl.glBegin(Gl.GL_QUADS);
Gl.glTexCoord2f(0.0f, 0.0f);
Gl.glVertex2f(0.0f, 0.0f);
Gl.glTexCoord2f(1.0f, 0.0f);
Gl.glVertex2f(1.0f, 0.0f);
Gl.glTexCoord2f(1.0f, 1.0f);
Gl.glVertex2f(1.0f, 1.0f);
Gl.glTexCoord2f(0.0f, 1.0f);
Gl.glVertex2f(0.0f, 1.0f);
Gl.glEnd();
PC.Draw();
Box1.Draw();
Box2.Draw();
Box3.Draw();
cntrl.Invalidate();
}
/// <summary>
/// Gets User Input
/// </summary>
public void GetInput()
{
if (keys[(int)Keys.D])
{
Box1.X -= speed;
Box2.X -= speed;
Box3.X -= speed;
}
if (keys[(int)Keys.A])
{
Box1.X += speed;
Box2.X += speed;
Box3.X += speed;
}
if (keys[(int)Keys.W])
{
Box1.Y += speed;
Box2.Y += speed;
Box3.Y += speed;
}
if (keys[(int)Keys.S])
{
Box1.Y -= speed;
Box2.Y -= speed;
Box3.Y -= speed;
}
}
}
}
Utilities:
#region Using Clauses
using System;
using System.IO;
using System.Drawing;
using System.Windows.Forms;
using Tao.OpenGl;
using Tao.FreeGlut;
#endregion
namespace Form_Practice
{
class Utilities
{
/// <summary>
/// Loads a bitmap file.
/// </summary>
/// <param name="filename">The filename of the bitmap.</param>
/// <returns>Returns a bitmap.</returns>
public static Bitmap LoadBitmap(string filename)
{
if (filename == null || filename == string.Empty)
return null;
string filename1 = string.Format("Data{0}{1}",
Path.DirectorySeparatorChar, filename);
string filename2 = string.Format("{0}{1}{0}{1}Data{1}{2}",
"..", Path.DirectorySeparatorChar, filename);
if (!File.Exists(filename) && !File.Exists(filename1) &&
!File.Exists(filename2))
return null;
if (File.Exists(filename))
return new Bitmap(filename);
else if (File.Exists(filename1))
return new Bitmap(filename1);
else if (File.Exists(filename2))
return new Bitmap(filename2);
return null;
}
}
}
Box.cs
#region Using Clauses
using System;
using System.Drawing;
using System.Windows.Forms;
using Tao.OpenGl;
using Tao.FreeGlut;
#endregion
namespace Form_Practice
{
struct Box
{
public float X, Y, Width, Height, R, G, B;
public Box(float x, float y, float width, float height, float r,
float g, float b)
{
this.X = x;
this.Y = y;
this.Width = width;
this.Height = height;
this.R = r;
this.G = g;
this.B = b;
}
public void Draw()
{
Gl.glColor3f(R, G, B);
Gl.glRectf(X, Y, X + Width, Y + Height);
}
}
}
