/// <summary>
///
/// </summary>
/// <param name="light"></param>
/// <param name="extrusionDistance"></param>
/// <returns></returns>
public override AxisAlignedBox GetDarkCapBounds(Light light, float extrusionDistance)
{
// Extrude own light cap bounds
// need a clone to avoid modifying the original bounding box
worldDarkCapBounds = (AxisAlignedBox)GetLightCapBounds().Clone();
ExtrudeBounds(worldDarkCapBounds, light.GetAs4DVector(), extrusionDistance);
return(worldDarkCapBounds);
}
public IEnumerator GetShadowVolumeRenderableIterator(ShadowTechnique shadowTechnique, Light light,
HardwareIndexBuffer indexBuffer, bool extrudeVertices,
float extrusionDistance, ulong flags)
{
Debug.Assert(indexBuffer != null, "Only external index buffers are supported right now");
Debug.Assert(indexBuffer.Type == IndexType.Size16, "Only 16-bit indexes supported for now");
// Calculate the object space light details
var lightPos = light.GetAs4DVector();
var world2Obj = parentNode.FullTransform.Inverse();
lightPos = world2Obj * lightPos;
// We need to search the edge list for silhouette edges
if (this.edgeList == null)
{
throw new Exception("You enabled stencil shadows after the buid process! In " +
"Region.GetShadowVolumeRenderableIterator");
}
// Init shadow renderable list if required
var init = this.shadowRenderables.Count == 0;
RegionShadowRenderable esr = null;
//bool updatedSharedGeomNormals = false;
for (var i = 0; i < this.edgeList.EdgeGroups.Count; i++)
{
var group = (EdgeData.EdgeGroup) this.edgeList.EdgeGroups[i];
if (init)
{
// Create a new renderable, create a separate light cap if
// we're using a vertex program (either for this model, or
// for extruding the shadow volume) since otherwise we can
// get depth-fighting on the light cap
esr = new RegionShadowRenderable(this, indexBuffer, group.vertexData, this.vertexProgramInUse || !extrudeVertices);
this.shadowRenderables.Add(esr);
}
else
{
esr = (RegionShadowRenderable)this.shadowRenderables[i];
}
// Extrude vertices in software if required
if (extrudeVertices)
{
ExtrudeVertices(esr.PositionBuffer, group.vertexData.vertexCount, lightPos, extrusionDistance);
}
}
return((IEnumerator)this.shadowRenderables);
}
public override IEnumerator GetShadowVolumeRenderableEnumerator( ShadowTechnique technique, Light light,
HardwareIndexBuffer indexBuffer, bool extrudeVertices,
float extrusionDistance, int flags )
{
Debug.Assert( indexBuffer != null, "Only external index buffers are supported right now" );
Debug.Assert( indexBuffer.Type == IndexType.Size16, "Only 16-bit indexes supported for now" );
// Potentially delegate to LOD entity
if ( this.meshLodIndex > 0 && this.mesh.IsLodManual )
{
Debug.Assert( this.meshLodIndex - 1 < this.lodEntityList.Count,
"No LOD EntityList - did you build the manual LODs after creating the entity?" );
var lodEnt = this.lodEntityList[ this.meshLodIndex - 1 ];
// index - 1 as we skip index 0 (original LOD)
if ( HasSkeleton && lodEnt.HasSkeleton )
{
// Copy the animation state set to lod entity, we assume the lod
// entity only has a subset animation states
CopyAnimationStateSubset( lodEnt.animationState, this.animationState );
}
return lodEnt.GetShadowVolumeRenderableEnumerator( technique, light, indexBuffer, extrudeVertices, extrusionDistance,
flags );
}
// Prep mesh if required
// NB This seems to result in memory corruptions, having problems
// tracking them down. For now, ensure that shadows are enabled
// before any entities are created
if ( !this.mesh.IsPreparedForShadowVolumes )
{
this.mesh.PrepareForShadowVolume();
// reset frame last updated to force update of buffers
this.frameAnimationLastUpdated = 0;
// re-prepare buffers
PrepareTempBlendedBuffers();
}
// Update any animation
UpdateAnimation();
// Calculate the object space light details
var lightPos = light.GetAs4DVector();
// Only use object-space light if we're not doing transforms
// Since when animating the positions are already transformed into
// world space so we need world space light position
var isAnimated = HasSkeleton || this.mesh.HasVertexAnimation;
if ( !isAnimated )
{
var world2Obj = parentNode.FullTransform.Inverse();
lightPos = world2Obj*lightPos;
}
// We need to search the edge list for silhouette edges
var edgeList = GetEdgeList();
// Init shadow renderable list if required
var init = ( this.shadowRenderables.Count == 0 );
if ( init )
{
this.shadowRenderables.Capacity = edgeList.edgeGroups.Count;
}
var updatedSharedGeomNormals = false;
EntityShadowRenderable esr = null;
EdgeData.EdgeGroup egi;
// note: using capacity for the loop since no items are in the list yet.
// capacity is set to how large the collection will be in the end
for ( var i = 0; i < this.shadowRenderables.Capacity; i++ )
{
egi = (EdgeData.EdgeGroup)edgeList.edgeGroups[ i ];
var data = ( isAnimated ? FindBlendedVertexData( egi.vertexData ) : egi.vertexData );
if ( init )
{
// Try to find corresponding SubEntity; this allows the
// linkage of visibility between ShadowRenderable and SubEntity
var subEntity = FindSubEntityForVertexData( egi.vertexData );
// Create a new renderable, create a separate light cap if
// we're using hardware skinning since otherwise we get
// depth-fighting on the light cap
esr = new EntityShadowRenderable( this, indexBuffer, data, subEntity.VertexProgramInUse || !extrudeVertices,
subEntity );
this.shadowRenderables.Add( esr );
}
else
{
esr = (EntityShadowRenderable)this.shadowRenderables[ i ];
if ( HasSkeleton )
{
// If we have a skeleton, we have no guarantee that the position
// buffer we used last frame is the same one we used last frame
// since a temporary buffer is requested each frame
// therefore, we need to update the EntityShadowRenderable
// with the current position buffer
esr.RebindPositionBuffer( data, isAnimated );
}
}
// For animated entities we need to recalculate the face normals
if ( isAnimated )
{
if ( egi.vertexData != this.mesh.SharedVertexData || !updatedSharedGeomNormals )
{
// recalculate face normals
edgeList.UpdateFaceNormals( egi.vertexSet, esr.PositionBuffer );
// If we're not extruding in software we still need to update
// the latter part of the buffer (the hardware extruded part)
// with the latest animated positions
if ( !extrudeVertices )
{
var srcPtr = esr.PositionBuffer.Lock( BufferLocking.Normal );
var destPtr = srcPtr + ( egi.vertexData.vertexCount*12 );
// 12 = sizeof(float) * 3
Memory.Copy( srcPtr, destPtr, 12*egi.vertexData.vertexCount );
esr.PositionBuffer.Unlock();
}
if ( egi.vertexData == this.mesh.SharedVertexData )
{
updatedSharedGeomNormals = true;
}
}
}
// Extrude vertices in software if required
if ( extrudeVertices )
{
ExtrudeVertices( esr.PositionBuffer, egi.vertexData.vertexCount, lightPos, extrusionDistance );
}
// Stop suppressing hardware update now, if we were
esr.PositionBuffer.SuppressHardwareUpdate( false );
}
// Calc triangle light facing
UpdateEdgeListLightFacing( edgeList, lightPos );
// Generate indexes and update renderables
GenerateShadowVolume( edgeList, indexBuffer, light, this.shadowRenderables, flags );
return this.shadowRenderables.GetEnumerator();
}
/// <summary>
///
/// </summary>
/// <param name="light"></param>
/// <param name="extrusionDistance"></param>
/// <returns></returns>
public override AxisAlignedBox GetDarkCapBounds(Light light, float extrusionDistance)
{
// Extrude own light cap bounds
// need a clone to avoid modifying the original bounding box
worldDarkCapBounds = (AxisAlignedBox)GetLightCapBounds().Clone();
ExtrudeBounds(worldDarkCapBounds, light.GetAs4DVector(), extrusionDistance);
return worldDarkCapBounds;
}
/// <summary>
///
/// </summary>
/// <param name="lt"></param>
/// <param name="lightindex"></param>
private void SetGLLightPositionDirection( Light lt, All lightindex )
{
// Set position / direction
Vector4 vec = Vector4.Zero;
// Use general 4D vector which is the same as GL's approach
vec = lt.GetAs4DVector();
// Must convert to float*
float[] tmp = new float[] { vec.x, vec.y, vec.z, vec.w };
OpenGL.Light( lightindex, All.Position, tmp );
// Set spotlight direction
if ( lt.Type == LightType.Spotlight )
{
Vector3 vec3 = lt.DerivedDirection;
float[] tmp2 = new float[] { vec3.x, vec3.y, vec3.z, 0 };
OpenGL.Light( lightindex, All.SpotDirection, tmp2 );
}
}
public IEnumerator GetShadowVolumeRenderableIterator( ShadowTechnique shadowTechnique, Light light,
HardwareIndexBuffer indexBuffer, bool extrudeVertices,
float extrusionDistance, ulong flags )
{
Debug.Assert( indexBuffer != null, "Only external index buffers are supported right now" );
Debug.Assert( indexBuffer.Type == IndexType.Size16, "Only 16-bit indexes supported for now" );
// Calculate the object space light details
var lightPos = light.GetAs4DVector();
var world2Obj = parentNode.FullTransform.Inverse();
lightPos = world2Obj*lightPos;
// We need to search the edge list for silhouette edges
if ( this.edgeList == null )
{
throw new Exception( "You enabled stencil shadows after the buid process! In " +
"Region.GetShadowVolumeRenderableIterator" );
}
// Init shadow renderable list if required
var init = this.shadowRenderables.Count == 0;
RegionShadowRenderable esr = null;
//bool updatedSharedGeomNormals = false;
for ( var i = 0; i < this.edgeList.EdgeGroups.Count; i++ )
{
var group = (EdgeData.EdgeGroup)this.edgeList.EdgeGroups[ i ];
if ( init )
{
// Create a new renderable, create a separate light cap if
// we're using a vertex program (either for this model, or
// for extruding the shadow volume) since otherwise we can
// get depth-fighting on the light cap
esr = new RegionShadowRenderable( this, indexBuffer, group.vertexData, this.vertexProgramInUse || !extrudeVertices );
this.shadowRenderables.Add( esr );
}
else
{
esr = (RegionShadowRenderable)this.shadowRenderables[ i ];
}
// Extrude vertices in software if required
if ( extrudeVertices )
{
ExtrudeVertices( esr.PositionBuffer, group.vertexData.vertexCount, lightPos, extrusionDistance );
}
}
return (IEnumerator)this.shadowRenderables;
}
private void SetGLLightPositionDirection( Light light, int index )
{
// Use general 4D vector which is the same as GL's approach
Vector4 vec4 = light.GetAs4DVector();
_tempLightVals[ 0 ] = vec4.x;
_tempLightVals[ 1 ] = vec4.y;
_tempLightVals[ 2 ] = vec4.z;
_tempLightVals[ 3 ] = vec4.w;
Gl.glLightfv( index, Gl.GL_POSITION, _tempLightVals );
// set spotlight direction
if ( light.Type == LightType.Spotlight )
{
var vec3 = light.DerivedDirection;
_tempLightVals[ 0 ] = vec3.x;
_tempLightVals[ 1 ] = vec3.y;
_tempLightVals[ 2 ] = vec3.z;
_tempLightVals[ 3 ] = 0.0f;
Gl.glLightfv( index, Gl.GL_SPOT_DIRECTION, _tempLightVals );
}
}
public override void ApplyDeltaValue(Vector4 val)
{
Vector4 v = light.GetAs4DVector();
SetValue(new Vector4(v.x + val.x, v.y + val.y, v.z + val.z, v.w + val.w));
}