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// Geometric Tools, LLC
// Copyright (c) 1998-2014
// Distributed under the Boost Software License, Version 1.0.
// http://www.boost.org/LICENSE_1_0.txt
// http://www.geometrictools.com/License/Boost/LICENSE_1_0.txt
//
// File Version: 5.0.0 (2010/01/01)
#include "Wm5GraphicsPCH.h"
#include "Wm5Particles.h"
#include "Wm5Camera.h"
#include "Wm5Culler.h"
#include "Wm5Renderer.h"
#include "Wm5VertexBufferAccessor.h"
using namespace Wm5;
WM5_IMPLEMENT_RTTI(Wm5, TriMesh, Particles);
WM5_IMPLEMENT_STREAM(Particles);
WM5_IMPLEMENT_FACTORY(Particles);
WM5_IMPLEMENT_DEFAULT_NAMES(TriMesh, Particles);
//----------------------------------------------------------------------------
Particles::Particles (VertexFormat* vformat, VertexBuffer* vbuffer,
int indexSize, Float4* positionSizes, float sizeAdjust)
:
TriMesh(vformat, vbuffer, 0),
mPositionSizes(positionSizes)
{
assertion(indexSize == 2 || indexSize == 4, "Invalid index size.\n");
int numVertices = mVBuffer->GetNumElements();
assertion((numVertices % 4) == 0,
"Number of vertices must be a multiple of 4\n");
mNumParticles = numVertices/4;
mNumActive = mNumParticles;
SetSizeAdjust(sizeAdjust);
// Get access to the texture coordinates.
VertexBufferAccessor vba(mVFormat, mVBuffer);
assertion(vba.HasTCoord(0),
"Texture coordinates must exist and use channel 0\n");
// Set the texture coordinates to the standard ones.
int i, j;
for (i = 0, j = 0; i < mNumParticles; ++i)
{
vba.TCoord<Float2>(0, j++) = Float2(0.0f, 0.0f);
vba.TCoord<Float2>(0, j++) = Float2(1.0f, 0.0f);
vba.TCoord<Float2>(0, j++) = Float2(1.0f, 1.0f);
vba.TCoord<Float2>(0, j++) = Float2(0.0f, 1.0f);
}
// Generate the indices for the quadrilaterals.
mIBuffer = new0 IndexBuffer(6*mNumParticles, indexSize);
int iFI, iFIp1, iFIp2, iFIp3;
if (indexSize == 2)
{
short* indices = (short*)mIBuffer->GetData();
for (i = 0; i < mNumParticles; ++i)
{
iFI = 4*i;
iFIp1 = iFI+1;
iFIp2 = iFI+2;
iFIp3 = iFI+3;
*indices++ = (short)iFI;
*indices++ = (short)iFIp1;
*indices++ = (short)iFIp2;
*indices++ = (short)iFI;
*indices++ = (short)iFIp2;
*indices++ = (short)iFIp3;
}
}
else // indexSize == 4
{
int* indices = (int*)mIBuffer->GetData();
for (i = 0; i < mNumParticles; ++i)
{
iFI = 4*i;
iFIp1 = iFI+1;
iFIp2 = iFI+2;
iFIp3 = iFI+3;
*indices++ = iFI;
*indices++ = iFIp1;
*indices++ = iFIp2;
*indices++ = iFI;
*indices++ = iFIp2;
*indices++ = iFIp3;
}
}
// Compute a bounding sphere based only on the particle locations.
mModelBound.ComputeFromData(mNumParticles, sizeof(Float4),
(const char*)positionSizes);
}
//----------------------------------------------------------------------------
Particles::~Particles ()
{
delete1(mPositionSizes);
}
//----------------------------------------------------------------------------
void Particles::SetSizeAdjust (float sizeAdjust)
{
if (sizeAdjust > 0.0f)
{
mSizeAdjust = sizeAdjust;
}
else
{
assertion(false, "Invalid size-adjust parameter\n");
mSizeAdjust = 1.0f;
}
}
//----------------------------------------------------------------------------
void Particles::SetNumActive (int numActive)
{
if (0 <= numActive && numActive <= mNumParticles)
{
mNumActive = numActive;
}
else
{
mNumActive = mNumParticles;
}
mIBuffer->SetNumElements(6*mNumActive);
mVBuffer->SetNumElements(4*mNumActive);
}
//----------------------------------------------------------------------------
void Particles::GenerateParticles (const Camera* camera)
{
// Get access to the positions.
VertexBufferAccessor vba(mVFormat, mVBuffer);
assertion(vba.HasPosition(), "Positions must exist\n");
// Get camera axis directions in model space of particles.
AVector UpR = WorldTransform.Inverse()*(camera->GetUVector() +
camera->GetRVector());
AVector UmR = WorldTransform.Inverse()*(camera->GetUVector() -
camera->GetRVector());
// Generate quadrilaterals as pairs of triangles.
for (int i = 0, j = 0; i < mNumActive; ++i)
{
Float4& posSize = mPositionSizes[i];
APoint position(posSize[0], posSize[1], posSize[2]);
float trueSize = mSizeAdjust*posSize[3];
AVector scaledUpR = trueSize*UpR;
AVector scaledUmR = trueSize*UmR;
vba.Position<Float3>(j++) = position - scaledUpR;
vba.Position<Float3>(j++) = position - scaledUmR;
vba.Position<Float3>(j++) = position + scaledUpR;
vba.Position<Float3>(j++) = position + scaledUmR;
}
UpdateModelSpace(GU_NORMALS);
Renderer::UpdateAll(mVBuffer);
}
//----------------------------------------------------------------------------
void Particles::GetVisibleSet (Culler& culler, bool noCull)
{
GenerateParticles(culler.GetCamera());
TriMesh::GetVisibleSet(culler, noCull);
}
//----------------------------------------------------------------------------
//----------------------------------------------------------------------------
// Streaming support.
//----------------------------------------------------------------------------
Particles::Particles (LoadConstructor value)
:
TriMesh(value),
mNumParticles(0),
mPositionSizes(0),
mSizeAdjust(0.0f),
mNumActive(0)
{
}
//----------------------------------------------------------------------------
void Particles::Load (InStream& source)
{
WM5_BEGIN_DEBUG_STREAM_LOAD(source);
TriMesh::Load(source);
source.ReadRR(mNumParticles, mPositionSizes);
source.Read(mSizeAdjust);
source.Read(mNumActive);
WM5_END_DEBUG_STREAM_LOAD(Particles, source);
}
//----------------------------------------------------------------------------
void Particles::Link (InStream& source)
{
TriMesh::Link(source);
}
//----------------------------------------------------------------------------
void Particles::PostLink ()
{
TriMesh::PostLink();
}
//----------------------------------------------------------------------------
bool Particles::Register (OutStream& target) const
{
return TriMesh::Register(target);
}
//----------------------------------------------------------------------------
void Particles::Save (OutStream& target) const
{
WM5_BEGIN_DEBUG_STREAM_SAVE(target);
TriMesh::Save(target);
target.WriteW(mNumParticles, mPositionSizes);
target.Write(mSizeAdjust);
target.Write(mNumActive);
WM5_END_DEBUG_STREAM_SAVE(Particles, target);
}
//----------------------------------------------------------------------------
int Particles::GetStreamingSize () const
{
int size = TriMesh::GetStreamingSize();
size += sizeof(mNumParticles);
size += mNumParticles*sizeof(mPositionSizes[0]);
size += sizeof(mSizeAdjust);
size += sizeof(mNumActive);
return size;
}
//----------------------------------------------------------------------------
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