/// <summary>
/// Creates texture data from a bitmap
/// </summary>
public static unsafe Texture2dData CreateTextureDataFromBitmap( Bitmap bmp )
{
Texture2dData data = new Texture2dData( );
TextureFormat format = GetCompatibleTextureFormatFromBitmap( ref bmp );
BitmapData bmpData = LockEntireBitmap( bmp );
data.Create( bmp.Width, bmp.Height, format );
fixed ( byte* dstBytes = data.Bytes )
{
MsvCrt.memcpy( dstBytes, ( void* )bmpData.Scan0, data.Bytes.Length );
}
return data;
}
/// <summary>
/// Creates texture data from the currently bound texture
/// </summary>
public static Texture2dData[] CreateTextureDataFromTexture( int target, TextureFormat format )
{
int width;
int height;
int level = 0;
List< Texture2dData > textureDataList = new List< Texture2dData >( );
do
{
width = GetTextureLevelParameterInt32( target, level, Gl.GL_TEXTURE_WIDTH );
height = GetTextureLevelParameterInt32( target, level, Gl.GL_TEXTURE_HEIGHT );
GraphicsLog.Verbose( "Creating texture data from level {0} ({1}x{2}) {3} texture", level, width, height, format );
// Get texture memory
int bytesPerPixel = TextureFormatInfo.GetSizeInBytes( format );
TextureInfo info = CheckTextureFormat( format );
byte[] textureMemory = new byte[ width * height * bytesPerPixel ];
Gl.glGetTexImage( Gl.GL_TEXTURE_2D, level, info.GlFormat, info.GlType, textureMemory );
Texture2dData textureData = new Texture2dData( );
textureData.Create( width, height, format, textureMemory );
textureDataList.Add( textureData );
++level;
} while ( ( width > 1 ) && ( height > 1 ) );
return textureDataList.ToArray( );
}
/// <summary>
/// Loads 2d texture data from the specified stream
/// </summary>
private static Texture2dData[] Load2dTextureData( BinaryReader reader, TextureFileFormatVersion1.Header header )
{
Texture2dData[] textureDataArray = new Texture2dData[ header.TextureDataEntries ];
for ( int textureDataCount = 0; textureDataCount < header.TextureDataEntries; ++textureDataCount )
{
TextureFileFormatVersion1.Group textureGroup = TextureFileFormatVersion1.Group.Read( reader );
if ( textureGroup.GroupId != GroupIdentifier.Texture2dDataGroup )
{
throw new FileLoadException( "Expected texture group" );
}
int width = reader.ReadInt32( );
int height = reader.ReadInt32( );
Texture2dData texData = new Texture2dData( );
texData.Create( width, height, header.Format );
reader.Read( texData.Bytes, 0, texData.Bytes.Length );
textureDataArray[ textureDataCount ] = texData;
}
return textureDataArray;
}
//
// Discrepancies in atmospheric modelling papers:
// - HG:
// - Neilsen: HG(t,g) = (1-g2)/(4pi(1 + g2 - 2cos(t))^1.5)
// - Wolfram: HG(t,g) = (1-g2)/(1 + g2 - 2.g.cos(t))^1.5
// - O'Neil (adapted HG): HG(t,g) = 3(1-g2)/2(2+g2) . (1+t2)/(1+g2 - 2gt)^1.5
// - O'Neil and Wolfram work well. Neilsen doesn't (denominator can evalute to < 0 before raising to 3/2 power)
// - Scattering coefficients: (# is wavelength)
// - Neilsen Rayleigh coefficient: 8pi^2(n2-1)^2/3N#^4
// - Neilsen Mie coefficient: 0.434c.pi.4pi^2/#^2K
// - K=non-wavelength dependent fudge factor for Bm: ~0.67
// - c=concentration factor(0.6544T-0.6510).10e-16 (T=turbidity. ~555nm)
//
//
//
//
// Realtime rendering of atmospheric scattering for flight simulators:
// http://www2.imm.dtu.dk/pubdb/views/edoc_download.php/2554/pdf/imm2554.pdf
//
// Display of The Earth Taking into Account Atmospheric Scattering: (Nishita)
// http://nis-lab.is.s.u-tokyo.ac.jp/~nis/abs_sig.html#sig93
//
// Implementation of Nishita's paper:
// http://www.gamedev.net/reference/articles/article2093.asp
//
// A practical analytical model of daylight:
// http://www.cs.utah.edu/vissim/papers/sunsky/sunsky.pdf
//
// Discussion about atmospheric shaders:
// http://www.gamedev.net/community/forums/topic.asp?topic_id=335023
//
// Paper that this model is based on:
// http://www.vis.uni-stuttgart.de/~schafhts/HomePage/pubs/wscg07-schafhitzel.pdf
//
// Heyney-Greenstein on Mathworld:
// http://scienceworld.wolfram.com/physics/Heyney-GreensteinPhaseFunction.html
//
/// <summary>
/// Builds a 3D lookup texture
/// </summary>
/// <param name="model">The atmosphere model</param>
/// <param name="parameters">Parameters for the build process</param>
/// <param name="progress">Optional progress object</param>
/// <returns>Returns a 3d texture data. Returns null if cancel was flagged in the progress object</returns>
public unsafe AtmosphereBuildOutputs Build( AtmosphereBuildModel model, AtmosphereBuildParameters parameters, AtmosphereBuildProgress progress )
{
Texture2dData opticalDepthTexture = new Texture2dData( );
Texture3dData scatteringTexture = new Texture3dData( );
scatteringTexture.Create( parameters.ViewAngleSamples, parameters.SunAngleSamples, parameters.HeightSamples, TextureFormat.R8G8B8A8 );
SetupModelAndParameters( parameters, model );
progress = progress ?? new AtmosphereBuildProgress( );
fixed ( byte* voxels = scatteringTexture.Bytes )
{
if ( !BuildScatteringTexture( parameters, voxels, progress ) )
{
return null;
}
}
if ( progress.Cancel )
{
return null;
}
opticalDepthTexture.Create( parameters.OpticalDepthResolution, parameters.OpticalDepthResolution, TextureFormat.R8G8B8 );
fixed ( byte* pixels = opticalDepthTexture.Bytes )
{
if ( !BuildOpticalDepthTexture( parameters, pixels, progress ) )
{
return null;
}
}
return new AtmosphereBuildOutputs( scatteringTexture, opticalDepthTexture );
}