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#region --- License ---
/* Licensed under the MIT/X11 license.
* Copyright (c) 2006-2008 the OpenTK Team.
* This notice may not be removed from any source distribution.
* See license.txt for licensing details.
*/
#endregion
// TODO: Find paint program that can properly export 8/16-bit Textures and make sure they are loaded correctly.
using System;
using System.Diagnostics;
using System.Drawing;
using System.Drawing.Imaging;
using OpenTK;
using OpenTK.Graphics;
using OpenTK.Graphics.OpenGL;
namespace Examples.TextureLoaders
{
class ImageGDI
{
public static void LoadFromDisk( string filename, out uint texturehandle, out TextureTarget dimension )
{
dimension = (TextureTarget) 0;
texturehandle = TextureLoaderParameters.OpenGLDefaultTexture;
ErrorCode GLError = ErrorCode.NoError;
Bitmap CurrentBitmap = null;
try // Exceptions will be thrown if any Problem occurs while working on the file.
{
CurrentBitmap = new Bitmap( filename );
if ( TextureLoaderParameters.FlipImages )
CurrentBitmap.RotateFlip( RotateFlipType.RotateNoneFlipY );
if ( CurrentBitmap.Height > 1 )
dimension = TextureTarget.Texture2D;
else
dimension = TextureTarget.Texture1D;
GL.GenTextures( 1, out texturehandle );
GL.BindTexture( dimension, texturehandle );
#region Load Texture
OpenTK.Graphics.OpenGL.PixelInternalFormat pif;
OpenTK.Graphics.OpenGL.PixelFormat pf;
OpenTK.Graphics.OpenGL.PixelType pt;
if (TextureLoaderParameters.Verbose)
Trace.WriteLine( "File: " + filename + " Format: " + CurrentBitmap.PixelFormat );
switch ( CurrentBitmap.PixelFormat )
{
case System.Drawing.Imaging.PixelFormat.Format8bppIndexed: // misses glColorTable setup
pif = OpenTK.Graphics.OpenGL.PixelInternalFormat.Rgb8;
pf = OpenTK.Graphics.OpenGL.PixelFormat.ColorIndex;
pt = OpenTK.Graphics.OpenGL.PixelType.Bitmap;
break;
case System.Drawing.Imaging.PixelFormat.Format16bppArgb1555:
case System.Drawing.Imaging.PixelFormat.Format16bppRgb555: // does not work
pif = OpenTK.Graphics.OpenGL.PixelInternalFormat.Rgb5A1;
pf = OpenTK.Graphics.OpenGL.PixelFormat.Bgr;
pt = OpenTK.Graphics.OpenGL.PixelType.UnsignedShort5551Ext;
break;
/* case System.Drawing.Imaging.PixelFormat.Format16bppRgb565:
pif = OpenTK.Graphics.OpenGL.PixelInternalFormat.R5G6B5IccSgix;
pf = OpenTK.Graphics.OpenGL.PixelFormat.R5G6B5IccSgix;
pt = OpenTK.Graphics.OpenGL.PixelType.UnsignedByte;
break;
*/
case System.Drawing.Imaging.PixelFormat.Format24bppRgb: // works
pif = OpenTK.Graphics.OpenGL.PixelInternalFormat.Rgb8;
pf = OpenTK.Graphics.OpenGL.PixelFormat.Bgr;
pt = OpenTK.Graphics.OpenGL.PixelType.UnsignedByte;
break;
case System.Drawing.Imaging.PixelFormat.Format32bppRgb: // has alpha too? wtf?
case System.Drawing.Imaging.PixelFormat.Canonical:
case System.Drawing.Imaging.PixelFormat.Format32bppArgb: // works
pif = OpenTK.Graphics.OpenGL.PixelInternalFormat.Rgba;
pf = OpenTK.Graphics.OpenGL.PixelFormat.Bgra;
pt = OpenTK.Graphics.OpenGL.PixelType.UnsignedByte;
break;
default:
throw new ArgumentException( "ERROR: Unsupported Pixel Format " + CurrentBitmap.PixelFormat );
}
BitmapData Data = CurrentBitmap.LockBits( new System.Drawing.Rectangle( 0, 0, CurrentBitmap.Width, CurrentBitmap.Height ), ImageLockMode.ReadOnly, CurrentBitmap.PixelFormat );
if ( Data.Height > 1 )
{ // image is 2D
if (TextureLoaderParameters.BuildMipmapsForUncompressed)
{
throw new Exception("Cannot build mipmaps, Glu is deprecated.");
// Glu.Build2DMipmap(dimension, (int)pif, Data.Width, Data.Height, pf, pt, Data.Scan0);
}
else
GL.TexImage2D(dimension, 0, pif, Data.Width, Data.Height, TextureLoaderParameters.Border, pf, pt, Data.Scan0);
} else
{ // image is 1D
if (TextureLoaderParameters.BuildMipmapsForUncompressed)
{
throw new Exception("Cannot build mipmaps, Glu is deprecated.");
// Glu.Build1DMipmap(dimension, (int)pif, Data.Width, pf, pt, Data.Scan0);
}
else
GL.TexImage1D(dimension, 0, pif, Data.Width, TextureLoaderParameters.Border, pf, pt, Data.Scan0);
}
GL.Finish( );
GLError = GL.GetError( );
if ( GLError != ErrorCode.NoError )
{
throw new ArgumentException( "Error building TexImage. GL Error: " + GLError );
}
CurrentBitmap.UnlockBits( Data );
#endregion Load Texture
#region Set Texture Parameters
GL.TexParameter( dimension, TextureParameterName.TextureMinFilter, (int) TextureLoaderParameters.MinificationFilter );
GL.TexParameter( dimension, TextureParameterName.TextureMagFilter, (int) TextureLoaderParameters.MagnificationFilter );
GL.TexParameter( dimension, TextureParameterName.TextureWrapS, (int) TextureLoaderParameters.WrapModeS );
GL.TexParameter( dimension, TextureParameterName.TextureWrapT, (int) TextureLoaderParameters.WrapModeT );
GL.TexEnv( TextureEnvTarget.TextureEnv, TextureEnvParameter.TextureEnvMode, (int) TextureLoaderParameters.EnvMode );
GLError = GL.GetError( );
if ( GLError != ErrorCode.NoError )
{
throw new ArgumentException( "Error setting Texture Parameters. GL Error: " + GLError );
}
#endregion Set Texture Parameters
return; // success
} catch ( Exception e )
{
dimension = (TextureTarget) 0;
texturehandle = TextureLoaderParameters.OpenGLDefaultTexture;
throw new ArgumentException( "Texture Loading Error: Failed to read file " + filename + ".\n" + e );
// return; // failure
} finally
{
CurrentBitmap = null;
}
}
}
}
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