void CCrackedWall::Initialize()
{
for( size_t i = 0; i < m_cpIndicatorBomb.size(); i++ )
{
m_cpIndicatorBomb[i]->GetTransformMatrix() = GetWorldMatrix();
}
SetBombPosition();
SetupParticle();
m_bInitialized = true;
}
//function that handles the custom rendering
void CParticleSystemGroup::RenderParticleSystem(ILTCustomRenderCallback* pInterface, const LTRigidTransform& tCamera)
{
//track our performance
CTimedSystemBlock TimingBlock(g_tsClientFXParticles);
//setup our vertex declaration
if(pInterface->SetVertexDeclaration(g_ClientFXVertexDecl.GetTexTangentSpaceDecl()) != LT_OK)
return;
//bind a quad index stream
if(pInterface->BindQuadIndexStream() != LT_OK)
return;
//set the fact that we were visible
*m_pVisibleFlag = true;
//now determine the largest number of particles that we can render at any time
uint32 nMaxParticlesPerBatch = QUAD_RENDER_INDEX_STREAM_SIZE / 6;
nMaxParticlesPerBatch = LTMIN(nMaxParticlesPerBatch, DYNAMIC_RENDER_VERTEX_STREAM_SIZE / (sizeof(STexTangentSpaceVert) * 4));
//determine the screen orientation
LTRotation rCamera = tCamera.m_rRot;
if (m_pProps->m_bObjectSpace)
{
LTRotation rObjectRotation;
g_pLTClient->GetObjectRotation(m_hCustomRender, &rObjectRotation);
rCamera = rObjectRotation.Conjugate() * rCamera;
}
LTVector vUp = rCamera.Up();
LTVector vRight = rCamera.Right();
//create some vectors to offset to each corner (avoids adding for displacement in the inner loop)
//Each one can just be scaled by the size of the particle to get the final offset
static const float kfHalfRoot2 = 0.5f * MATH_SQRT2;
//premultiplied versions of up and right scaled by half the square root of two
LTVector vUpHalfRoot2 = vUp * kfHalfRoot2;
LTVector vRightHalfRoot2 = vRight * kfHalfRoot2;
//precalculate the diagonals for non-rotating particles since these are constant
LTVector vDiagonals[4];
vDiagonals[0] = vUpHalfRoot2 - vRightHalfRoot2;
vDiagonals[1] = vUpHalfRoot2 + vRightHalfRoot2;
vDiagonals[2] = -vUpHalfRoot2 + vRightHalfRoot2;
vDiagonals[3] = -vUpHalfRoot2 - vRightHalfRoot2;
uint32 nNumParticlesLeft = m_Particles.GetNumParticles();
//precalculate some data for the basis space of the particles
LTVector vNormal = -rCamera.Forward();
LTVector vTangent = vRight;
LTVector vBinormal = -vUp;
//the U scale for particle images
float fUImageWidth = 1.0f / (float)m_pProps->m_nNumImages;
//variables used within the inner loop
float fSize;
uint32 nColor;
//now run through all the particles and render
CParticleIterator itParticles = m_Particles.GetIterator();
while(nNumParticlesLeft > 0)
{
//determine our batch size
uint32 nBatchSize = LTMIN(nNumParticlesLeft, nMaxParticlesPerBatch);
//lock down our buffer for rendering
SDynamicVertexBufferLockRequest LockRequest;
if(pInterface->LockDynamicVertexBuffer(nBatchSize * 4, LockRequest) != LT_OK)
return;
//fill in a batch of particles
STexTangentSpaceVert* pCurrOut = (STexTangentSpaceVert*)LockRequest.m_pData;
if(m_pProps->m_bRotate)
{
//we need to render the particles rotated
for(uint32 nBatchParticle = 0; nBatchParticle < nBatchSize; nBatchParticle++)
{
//sanity check
LTASSERT(!itParticles.IsDone(), "Error: Particle count and iterator mismatch");
//get the particle from the iterator
SParticle* pParticle = (SParticle*)itParticles.GetParticle();
GetParticleSizeAndColor(pParticle, nColor, fSize);
//determine the sin and cosine of this particle angle
float fAngle = pParticle->m_fAngle;
float fSinAngle = LTSin(fAngle);
float fCosAngle = LTCos(fAngle);
LTVector vRotRight = (vRightHalfRoot2 * fCosAngle + vUpHalfRoot2 * fSinAngle) * fSize;
LTVector vRotUp = vNormal.Cross(vRotRight);
LTVector vRotTangent = vTangent * fCosAngle + vBinormal * fSinAngle;
LTVector vRotBinormal = vTangent * fSinAngle + vBinormal * fCosAngle;
SetupParticle( pCurrOut,
pParticle->m_Pos + vRotUp - vRotRight,
pParticle->m_Pos + vRotUp + vRotRight,
pParticle->m_Pos - vRotUp + vRotRight,
pParticle->m_Pos - vRotUp - vRotRight,
nColor, vNormal, vRotTangent, vRotBinormal,
pParticle->m_nUserData & PARTICLE_IMAGE_MASK, fUImageWidth);
//move onto the next set of particles
pCurrOut += 4;
//move onto the next particle for processing
itParticles.Next();
}
}
else if (m_pProps->m_bStreak)
{
//the particles are non-rotated but streaked along their velocity
for(uint32 nBatchParticle = 0; nBatchParticle < nBatchSize; nBatchParticle++)
{
//sanity check
LTASSERT(!itParticles.IsDone(), "Error: Particle count and iterator mismatch");
//get the particle from the iterator
SParticle* pParticle = (SParticle*)itParticles.GetParticle();
GetParticleSizeAndColor(pParticle, nColor, fSize);
//in order to render the streak, we determine a line that passes through
//the particle and runs in the direction of the velocity of the particle
//we need to project the velocity onto the screen
LTVector2 vScreen;
vScreen.x = -(pParticle->m_Velocity.Dot(vRight));
vScreen.y = -(pParticle->m_Velocity.Dot(vUp));
//we know that the up and right vectors are normalized, so we can save some work by
//just doing a 2d normalization
float fMag = vScreen.Mag();
if(fMag == 0.0f)
vScreen.Init(fSize, 0.0f);
else
vScreen *= fSize / fMag;
//determine our actual screen space velocity
LTVector vScreenRight = vUp * vScreen.y + vRight * vScreen.x;
LTVector vScreenUp = vUp * -vScreen.x + vRight * vScreen.y;
//and now compute the endpoint of the streak
LTVector vEndPos = pParticle->m_Pos - pParticle->m_Velocity * m_pProps->m_fStreakScale;
SetupParticle( pCurrOut,
pParticle->m_Pos - vScreenRight - vScreenUp,
vEndPos + vScreenRight - vScreenUp,
vEndPos + vScreenRight + vScreenUp,
pParticle->m_Pos - vScreenRight + vScreenUp,
nColor, vNormal, vScreenRight, vScreenUp,
pParticle->m_nUserData & PARTICLE_IMAGE_MASK, fUImageWidth);
//move onto the next set of particles
pCurrOut += 4;
//move onto the next particle for processing
itParticles.Next();
}
}
else
{
//the particles are non-rotated
for(uint32 nBatchParticle = 0; nBatchParticle < nBatchSize; nBatchParticle++)
{
//sanity check
LTASSERT(!itParticles.IsDone(), "Error: Particle count and iterator mismatch");
//get the particle from the iterator
SParticle* pParticle = (SParticle*)itParticles.GetParticle();
GetParticleSizeAndColor(pParticle, nColor, fSize);
SetupParticle( pCurrOut,
pParticle->m_Pos + vDiagonals[0] * fSize,
pParticle->m_Pos + vDiagonals[1] * fSize,
pParticle->m_Pos + vDiagonals[2] * fSize,
pParticle->m_Pos + vDiagonals[3] * fSize,
nColor, vNormal, vTangent, vBinormal,
pParticle->m_nUserData & PARTICLE_IMAGE_MASK, fUImageWidth);
//move onto the next set of particles
pCurrOut += 4;
//move onto the next particle for processing
itParticles.Next();
}
}
//unlock and render the batch
pInterface->UnlockAndBindDynamicVertexBuffer(LockRequest);
pInterface->RenderIndexed( eCustomRenderPrimType_TriangleList,
0, nBatchSize * 6, LockRequest.m_nStartIndex,
0, nBatchSize * 4);
nNumParticlesLeft -= nBatchSize;
}
}
