public override void ApplyObliqueDepthProjection(ref Matrix4 matrix, Plane plane, bool forGpuProgram)
{
// Thanks to Eric Lenyel for posting this calculation at www.terathon.com
// Calculate the clip-space corner point opposite the clipping plane
// as (sgn(clipPlane.x), sgn(clipPlane.y), 1, 1) and
// transform it into camera space by multiplying it
// by the inverse of the projection matrix
/* generalised version
* Vector4 q = matrix.inverse() *
* Vector4(Math::Sign(plane.normal.x), Math::Sign(plane.normal.y), 1.0f, 1.0f);
*/
var q = new Vector4();
q.x = System.Math.Sign(plane.Normal.x) / matrix.m00;
q.y = System.Math.Sign(plane.Normal.y) / matrix.m11;
q.z = 1.0f;
// flip the next bit from Lengyel since we're right-handed
if (forGpuProgram)
{
q.w = (1.0f - matrix.m22) / matrix.m23;
}
else
{
q.w = (1.0f + matrix.m22) / matrix.m23;
}
// Calculate the scaled plane vector
var clipPlane4D = new Vector4(plane.Normal.x, plane.Normal.y, plane.Normal.z, plane.D);
var c = clipPlane4D * (1.0f / (clipPlane4D.Dot(q)));
// Replace the third row of the projection matrix
matrix.m20 = c.x;
matrix.m21 = c.y;
// flip the next bit from Lengyel since we're right-handed
if (forGpuProgram)
{
matrix.m22 = c.z;
}
else
{
matrix.m22 = -c.z;
}
matrix.m23 = c.w;
}
public override void UpdateGpuProgramsParams( Graphics.IRenderable rend, Graphics.Pass pass,
Graphics.AutoParamDataSource source,
Core.Collections.LightList lightList )
{
int shadowIndex = 0;
foreach ( var it in this.shadowTextureParamsList )
{
it.WorldViewProjMatrix.SetGpuParameter( source.GetTextureWorldViewProjMatrix( shadowIndex ) );
it.InvTextureSize.SetGpuParameter( source.GetInverseTextureSize( it.TextureSamplerIndex ) );
shadowIndex++;
}
var splitPoints = new Vector4();
splitPoints.x = this.shadowTextureParamsList[ 0 ].MaxRange;
splitPoints.y = this.shadowTextureParamsList[ 1 ].MaxRange;
splitPoints.z = 0.0;
splitPoints.w = 0.0;
this.psSplitPoints.SetGpuParameter( splitPoints );
}
/// <summary>
/// Multiplies a Vector4 by a scalar value.
/// </summary>
/// <param name="vector"></param>
/// <param name="scalar"></param>
/// <returns></returns>
public static Vector4 operator *( Vector4 vector, Real scalar )
{
var result = new Vector4();
result.x = vector.x*scalar;
result.y = vector.y*scalar;
result.z = vector.z*scalar;
result.w = vector.w*scalar;
return result;
}
// TODO: Find the signifance of having 2 overloads with opposite param lists that do transposed operations
public static Vector4 operator *( Vector4 vector, Matrix4 matrix )
{
var result = new Vector4();
result.x = vector.x*matrix.m00 + vector.y*matrix.m10 + vector.z*matrix.m20 + vector.w*matrix.m30;
result.y = vector.x*matrix.m01 + vector.y*matrix.m11 + vector.z*matrix.m21 + vector.w*matrix.m31;
result.z = vector.x*matrix.m02 + vector.y*matrix.m12 + vector.z*matrix.m22 + vector.w*matrix.m32;
result.w = vector.x*matrix.m03 + vector.y*matrix.m13 + vector.z*matrix.m23 + vector.w*matrix.m33;
return result;
}
/// <summary>
///
/// </summary>
/// <param name="vector"></param>
/// <param name="matrix"></param>
/// <returns></returns>
public static Vector4 Multiply( Vector4 vector, Matrix4 matrix )
{
return vector*matrix;
}
/// <summary>
/// Calculates the dot (scalar) product of this vector with another.
/// </summary>
/// <param name="vec">
/// Vector with which to calculate the dot product (together with this one).
/// </param>
/// <returns>A Real representing the dot product value.</returns>
public Real Dot( Vector4 vec )
{
return this.x*vec.x + this.y*vec.y + this.z*vec.z + this.w*vec.w;
}
public override void ApplyObliqueDepthProjection( ref Matrix4 matrix, Plane plane, bool forGpuProgram )
{
// Thanks to Eric Lenyel for posting this calculation at www.terathon.com
// Calculate the clip-space corner point opposite the clipping plane
// as (sgn(clipPlane.x), sgn(clipPlane.y), 1, 1) and
// transform it into camera space by multiplying it
// by the inverse of the projection matrix
/* generalised version
Vector4 q = matrix.inverse() *
Vector4(Math::Sign(plane.normal.x), Math::Sign(plane.normal.y), 1.0f, 1.0f);
*/
var q = new Vector4();
q.x = System.Math.Sign( plane.Normal.x )/matrix.m00;
q.y = System.Math.Sign( plane.Normal.y )/matrix.m11;
q.z = 1.0f;
// flip the next bit from Lengyel since we're right-handed
if ( forGpuProgram )
{
q.w = ( 1.0f - matrix.m22 )/matrix.m23;
}
else
{
q.w = ( 1.0f + matrix.m22 )/matrix.m23;
}
// Calculate the scaled plane vector
var clipPlane4D = new Vector4( plane.Normal.x, plane.Normal.y, plane.Normal.z, plane.D );
var c = clipPlane4D*( 1.0f/( clipPlane4D.Dot( q ) ) );
// Replace the third row of the projection matrix
matrix.m20 = c.x;
matrix.m21 = c.y;
// flip the next bit from Lengyel since we're right-handed
if ( forGpuProgram )
{
matrix.m22 = c.z;
}
else
{
matrix.m22 = -c.z;
}
matrix.m23 = c.w;
}
public void SetFogProperties( FogMode fogMode, ColorEx fogColor, float fogStart, float fogEnd, float fogDensity )
{
this.fogMode = fogMode;
this.fogColorValue = fogColor;
this.fogParamsValue = new Vector4( fogDensity, fogStart, fogEnd, fogEnd != fogStart ? 1/( fogEnd - fogStart ) : 0 );
}