// IMPORTANT: This method can be called only once per frame. If it is not, it will stall CPU for quite long time
// Helper function to read atomic UAV counters back onto the CPU.
// The method reads in the current frame the value from the previous frame
private static int ReadCounter(IUavBindable uav)
{
int count = 0;
if (VRage.MyCompilationSymbols.DX11Debug)
{
// Copy the UAV counter to a staging resource
RC.CopyStructureCount(m_debugCounterBuffers[m_debugCounterBuffersIndex], 0, uav);
m_debugCounterBuffersIndex = m_debugCounterBuffersIndex == 1 ? 0 : 1;
var mapping = MyMapping.MapRead(m_debugCounterBuffers[m_debugCounterBuffersIndex]);
mapping.ReadAndPosition(ref count);
mapping.Unmap();
}
return(count);
}
internal static void Run(ISrvBindable depthRead, ISrvBindable gbufferNormalsRead)
{
// The maximum number of supported GPU particles
ISrvBindable textureArraySrv;
int emitterCount = MyGPUEmitters.Gather(m_emitterData, out textureArraySrv);
if (emitterCount == 0)
{
return;
}
// Unbind current targets while we run the compute stages of the system
//RC.DeviceContext.OutputMerger.SetTargets(null);
// global GPU particles setup
RC.SetDepthStencilState(MyDepthStencilStateManager.DefaultDepthState);
RC.SetRasterizerState(MyRasterizerStateManager.NocullRasterizerState);
RC.SetInputLayout(null);
RC.ComputeShader.SetConstantBuffer(MyCommon.FRAME_SLOT, MyCommon.FrameConstants);
RC.ComputeShader.SetSamplers(0, MySamplerStateManager.StandardSamplers);
RC.PixelShader.SetSamplers(0, MySamplerStateManager.StandardSamplers);
RC.AllShaderStages.SetConstantBuffer(4, MyRender11.DynamicShadows.ShadowCascades.CascadeConstantBuffer);
RC.VertexShader.SetSampler(MyCommon.SHADOW_SAMPLER_SLOT, MySamplerStateManager.Shadowmap);
RC.VertexShader.SetSrv(MyCommon.CASCADES_SM_SLOT, MyRender11.DynamicShadows.ShadowCascades.CascadeShadowmapArray);
RC.VertexShader.SetSamplers(0, MySamplerStateManager.StandardSamplers);
// If we are resetting the particle system, then initialize the dead list
if (m_resetSystem)
{
ResetInternal();
m_resetSystem = false;
}
MyGpuProfiler.IC_BeginBlock("Emit");
// Emit particles into the system
Emit(emitterCount, m_emitterData, depthRead);
MyGpuProfiler.IC_EndBlock();
// Run the simulation for this frame
MyGpuProfiler.IC_BeginBlock("Simulate");
Simulate(depthRead, gbufferNormalsRead);
MyGpuProfiler.IC_EndBlock();
// Copy the atomic counter in the alive list UAV into a constant buffer for access by subsequent passes
RC.CopyStructureCount(m_activeListConstantBuffer, 0, m_aliveIndexBuffer);
// Only read number of alive and dead particle back to the CPU in debug as we don't want to stall the GPU in release code
ProfilerShort.Begin("Debug - ReadCounter");
MyGpuProfiler.IC_BeginBlock("Debug - ReadCounter");
int numActiveParticlesAfterSimulation = ReadCounter(m_aliveIndexBuffer);
MyGpuProfiler.IC_EndBlock();
ProfilerShort.End();
MyGpuProfiler.IC_BeginBlock("Render");
Render(textureArraySrv, depthRead);
MyGpuProfiler.IC_EndBlock();
RC.ComputeShader.SetSamplers(0, MySamplerStateManager.StandardSamplers);
MyStatsDisplay.Write("GPU particles", "Live #", numActiveParticlesAfterSimulation);
}