Method RunSimulation

trinity/Particle/Tr2GpuParticleSystem.cpp:411–454

-------------------------------------------------------------------------------------- Description: Runs physics simulation. Basically executes a single compute shader --------------------------------------------------------------------------------------

//   Runs physics simulation. Basically executes a single compute shader
// --------------------------------------------------------------------------------------
void Tr2GpuParticleSystem::RunSimulation( float dt, const Vector3& originShift, Tr2RenderContext& renderContext )
{
	m_updateTimer.Begin( renderContext );
	ON_BLOCK_EXIT( [&] { m_updateTimer.End( renderContext ); } );

	const uint32_t numthreadsX = 16;
	const uint32_t numthreadsY = 16;

	struct
	{
		uint32_t groupX;
		uint32_t groupY;
		uint32_t groupZ;
		float dt;

		Vector3 originShift;
		uint32_t bufferSize;

		Vector3 turbulenceOffset;
		float padding1;

		Vector3 turbulenceAnimation;
		float padding2;

		Vector4 frustumPlanes[6];
	} updateCB;

	updateCB.groupX = 32;
	updateCB.groupY = std::max( m_maxParticles / 32 / numthreadsX / numthreadsY, 1u );
	updateCB.groupZ = std::max( m_maxParticles / 32 / 32 / numthreadsX / numthreadsY, 1u );
	updateCB.dt = dt;
	updateCB.originShift = originShift;
	updateCB.bufferSize = m_particleData->GetCount();
	updateCB.turbulenceOffset = m_turbulenceOffset;
	updateCB.turbulenceAnimation = m_turbulenceAnimation;

	for( size_t i = 0; i < 6; ++i )
	{
		Tr2Renderer::GetFrustumPlane( i, updateCB.frustumPlanes[i] );
	}
	FillAndSetConstants( m_updateCB, updateCB, Tr2RenderContextEnum::COMPUTE_SHADER, Tr2Renderer::GetPerObjectVSStartRegister(), renderContext );
	Tr2Renderer::RunComputeShader( m_update, BlueSharedString( "ClearCounters" ), 1, 1, 1, renderContext );
	Tr2Renderer::RunComputeShader( m_update, updateCB.groupX, updateCB.groupY, updateCB.groupZ, renderContext );
}

// --------------------------------------------------------------------------------------
// Description: