public override void SetTextureCoordCalculation( int stage, TexCoordCalcMethod method, Frustum frustum )
{
if ( stage > _fixedFunctionTextureUnits )
{
// Can't do this
return;
}
float[] m = new float[ 16 ];
Matrix4 projectionBias = Matrix4.Identity;
// Default to no extra auto texture matrix
_useAutoTextureMatrix = false;
if ( !ActivateGLTextureUnit( stage ) )
return;
switch ( method )
{
case TexCoordCalcMethod.None:
break;
case TexCoordCalcMethod.EnvironmentMap:
_useAutoTextureMatrix = true;
_autoTextureMatrix = new float[ 16 ];
_autoTextureMatrix[ 0 ] = _autoTextureMatrix[ 10 ] = _autoTextureMatrix[ 15 ] = 1.0f;
_autoTextureMatrix[ 5 ] = -1.0f;
break;
case TexCoordCalcMethod.EnvironmentMapPlanar:
// TODO not implemented
break;
case TexCoordCalcMethod.EnvironmentMapReflection:
// We need an extra texture matrix here
// This sets the texture matrix to be the inverse of the view matrix
_useAutoTextureMatrix = true;
MakeGLMatrix( ref m, _ViewMatrix );
if ( _autoTextureMatrix == null )
_autoTextureMatrix = new float[ 16 ];
// Transpose 3x3 in order to invert matrix (rotation)
// Note that we need to invert the Z _before_ the rotation
// No idea why we have to invert the Z at all, but reflection is wrong without it
_autoTextureMatrix[ 0 ] = m[ 0 ];
_autoTextureMatrix[ 1 ] = m[ 4 ];
_autoTextureMatrix[ 2 ] = -m[ 8 ];
_autoTextureMatrix[ 4 ] = m[ 1 ];
_autoTextureMatrix[ 5 ] = m[ 5 ];
_autoTextureMatrix[ 6 ] = -m[ 9 ];
_autoTextureMatrix[ 8 ] = m[ 2 ];
_autoTextureMatrix[ 9 ] = m[ 6 ];
_autoTextureMatrix[ 10 ] = -m[ 10 ];
_autoTextureMatrix[ 3 ] = _autoTextureMatrix[ 7 ] = _autoTextureMatrix[ 11 ] = 0.0f;
_autoTextureMatrix[ 12 ] = _autoTextureMatrix[ 13 ] = _autoTextureMatrix[ 14 ] = 0.0f;
_autoTextureMatrix[ 15 ] = 1.0f;
break;
case TexCoordCalcMethod.EnvironmentMapNormal:
break;
case TexCoordCalcMethod.ProjectiveTexture:
_useAutoTextureMatrix = true;
if ( _autoTextureMatrix == null )
_autoTextureMatrix = new float[ 16 ];
// Set scale and translation matrix for projective textures
projectionBias = Matrix4.ClipSpace2DToImageSpace;
projectionBias = projectionBias * frustum.ProjectionMatrix;
projectionBias = projectionBias * frustum.ViewMatrix;
projectionBias = projectionBias * _worldMatrix;
MakeGLMatrix( ref _autoTextureMatrix, projectionBias );
break;
default:
break;
}
ActivateGLTextureUnit( 0 );
}
/// <summary>
