public class Texture
{
#region Attributes
public uint[] texture;
public string path;
public double texSStep;
public double texTStep;
#endregion
#region Methods
public Texture(string path)
{
texture = new uint[1];
this.path = path;
this.texTStep = 1.0 / 256.0;
this.texSStep = 1.0 / 256.0;
loadBitmap();
}
private void loadBitmap()
{
Bitmap image = null;
System.Drawing.Imaging.BitmapData bitmapdata = null;
Rectangle rect;
try
{
image = new Bitmap(this.path);
image.RotateFlip(RotateFlipType.RotateNoneFlipY);
rect = new Rectangle(0, 0, image.Width, image.Height);
bitmapdata = image.LockBits(rect, System.Drawing.Imaging.ImageLockMode.ReadOnly,
System.Drawing.Imaging.PixelFormat.Format24bppRgb);
Gl.glGenTextures(1, texture);
Gl.glBindTexture(Gl.GL_TEXTURE_2D, texture[0]);
Gl.glTexParameteri(Gl.GL_TEXTURE_2D, Gl.GL_TEXTURE_MIN_FILTER, Gl.GL_LINEAR); // Linear Filtering
Gl.glTexParameteri(Gl.GL_TEXTURE_2D, Gl.GL_TEXTURE_MAG_FILTER, Gl.GL_LINEAR); // Linear Filtering
Gl.glTexImage2D(Gl.GL_TEXTURE_2D, 0, Gl.GL_RGB8, image.Width, image.Height,
0, Gl.GL_BGR_EXT, Gl.GL_UNSIGNED_BYTE, bitmapdata.Scan0);
}
catch (Exception e)
{
// Handle Any Exceptions While Loading Textures, Exit App
string errorMsg = "An Error Occurred While Loading Texture:\n\t" + path + "\n" + "\n\nStack Trace:\n\t" + e.StackTrace + "\n";
MessageBox.Show(errorMsg, "Error", MessageBoxButtons.OK, MessageBoxIcon.Stop);
}
finally
{
if (image != null)
{
image.UnlockBits(bitmapdata);
image.Dispose();
}
}
}
#endregion
}
Too much time for a bitmap!!
Author
Hi there :)
I was rendering an object composed of simple QUADS ,and this object keeps rotating along x as the rotation angle value changes every time the drawing method is called .
My problem started when I tried to perform texture mapping using bitmap images .
When the quads were finally textured , I found that the rotation of the object was too slow .. and then I noticed that the loadBitmap function was the one which took too much time .
I'm using Tao framework with C#.
Texture class :
I found out that the loader was the bottle neck when I tried to "hint" it and rebuild my project, so .. any ideas ??
Regards ..
Quote:I found that the rotation of the object was too slow .. and then I noticed that the loadBitmap function was the one which took too much time .
Are you reloading the texture every time you draw it? This is a huge amount of data and it should only be uploaded once during initialization. Doing it every frame will definitely be very slow.
I don't know anything about Tao, but you should only have to load the texture once and then you can draw it / rotate it as many times as you want.
Author
Aha .. that's it !!
New textures were defined every time the Draw function was called .
Thank you karwosts :)
New textures were defined every time the Draw function was called .
Thank you karwosts :)
This topic is closed to new replies.
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