Draw

[matmatmat]

Hi, I'm trying to render a texture that is not a power of 2 (eg 512, 1026 etc) with OpenTK, a C# OOP wrapper for OpenGL. But it only shows the top corner of the image.


public void LoadTexture(string filename)
{
if (String.IsNullOrEmpty(filename))
throw new ArgumentException(filename);

int id = GL.GenTexture();
GL.BindTexture(TextureTarget.Texture2D, id);

Bitmap bmp = new Bitmap(filename);
width = bmp.Width;
height = bmp.Height;
int w2 = (int)PowerOf2(width);
int h2 = (int)PowerOf2(height);
Bitmap bmp2 = new Bitmap(w2, h2);
Graphics gfx = Graphics.FromImage(bmp2);
gfx.DrawImage(bmp, new Point(0,0));
width_ratio = width/w2;
height_ratio = 1 - height/h2;
bmp2.Save("save.bmp");
BitmapData bmp_data = bmp2.LockBits(new Rectangle(0, 0, bmp.Width, bmp.Height), ImageLockMode.ReadOnly, System.Drawing.Imaging.PixelFormat.Format32bppArgb );
GL.TexImage2D(TextureTarget.Texture2D, 0, PixelInternalFormat.Rgba, bmp_data.Width, bmp_data.Height, 0,
OpenTK.Graphics.OpenGL.PixelFormat.Bgra, PixelType.UnsignedByte, bmp_data.Scan0);

bmp2.UnlockBits(bmp_data);

// We haven't uploaded mipmaps, so disable mipmapping (otherwise the texture will not appear).
// On newer video cards, we can use GL.GenerateMipmaps() or GL.Ext.GenerateMipmaps() to create
// mipmaps automatically. In that case, use TextureMinFilter.LinearMipmapLinear to enable them.
GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureMinFilter, (int)TextureMinFilter.Linear);
GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureMagFilter, (int)TextureMagFilter.Linear);

tex = id;
}
//render

GL.BindTexture(TextureTarget.Texture2D, tex.tex);
GL.Begin (BeginMode.Quads);
// GL.TexCoord2(0,1); GL.Vertex3 (x, y, z);
// GL.TexCoord2(1,1); GL.Vertex3 (x+width, y, z);
// GL.TexCoord2(1,0); GL.Vertex3 (x+width, y+height, z);
// GL.TexCoord2(0,0); GL.Vertex3 (x, y+height, z);
GL.TexCoord2(0,1); GL.Vertex2 (x, y+tex.height);
GL.TexCoord2(tex.width_ratio,1); GL.Vertex2 (x+tex.width, y+tex.height);
GL.TexCoord2(tex.width_ratio,tex.height_ratio); GL.Vertex2 (x+tex.width, y);
GL.TexCoord2(0,tex.height_ratio); GL.Vertex2 (x, y);
GL.End ();


This is what it looks like on my screen:
http://imagebin.ca/img/BWNFD9f.png
and what the picture should be:
http://imagebin.ca/img/t2sIZSj.png

[matmatmat]

oops: thread title isn't right