/// <summary></summary>
public void Dispose()
{
DisposeMember(ref positionSizeBufferA);
DisposeMember(ref velocityRotationBufferA);
DisposeMember(ref userBufferA);
DisposeMember(ref colourBufferA);
DisposeMember(ref positionSizeBufferB);
DisposeMember(ref velocityRotationBufferB);
DisposeMember(ref userBufferB);
DisposeMember(ref colourBufferB);
DisposeMember(ref lifeStoreBufferA);
DisposeMember(ref lifeStoreBufferB);
DisposeMember(ref mrtGroupA);
DisposeMember(ref mrtGroupB);
lifeStepParticleData = null;
allProcessors = null;
activeRenderPass = null;
verticesRenderIndex = null;
scissorTest = null;
backgroundFillPass = null;
randomTexture = null;
shaderRandomValues = null;
}
void IParticleProcessor.Initalise(ParticleSystemTypeData typeData, IParticleProcessor[] allProcessors, bool useColourValues, uint maxLifeTimeSteps, uint timeStepHz, uint maxExpectedCount)
{
this.processorData = typeData.RuntimeLogicData.GpuParticleProcessorData;
//compute resolution to fit the particle count
this.resolutionX = 2;
this.resolutionY = 2;
while (true)
{
int count = resolutionX * resolutionY;
if (count >= maxExpectedCount)
{
break;
}
if (resolutionY >= resolutionX)
{
resolutionX *= 2;
}
else
{
resolutionY *= 2;
}
}
resolutionXF = (float)resolutionX;
resolutionYF = (float)resolutionY;
this.particleTypeData = typeData;
this.allProcessors = allProcessors;
this.renderPasses = new GpuParticleRenderPass[4];
this.shaderRandomValues = new Random();
this.maxParticleTimeStep = maxLifeTimeSteps;
this.systemStepDeltaTime = 1.0f / ((float)timeStepHz);
bool usesUserValues = typeData.RuntimeLogicData.SystemUsesUserValues;
bool usesLifeOrAge = typeData.RuntimeLogicData.SystemUsesLifeOrAgeValues;
this.usesLifeStorage = usesLifeOrAge;
SurfaceFormat vec4Format = SurfaceFormat.HalfVector4;
if (!ParticleSystem.gpuVTexHalfVec4supported)
{
vec4Format = SurfaceFormat.Vector4;
}
this.positionSizeBufferA = new DrawTargetTexture2D(camera, resolutionX, resolutionY, vec4Format);
this.velocityRotationBufferA = new DrawTargetTexture2D(camera, resolutionX, resolutionY, vec4Format);
if (useColourValues)
{
this.colourBufferA = new DrawTargetTexture2D(camera, resolutionX, resolutionY, vec4Format);
}
if (usesUserValues)
{
this.userBufferA = new DrawTargetTexture2D(camera, resolutionX, resolutionY, vec4Format);
}
#if XBOX360
//technically doing this can produce bugs when the buffers combine to be greater than 10MiB
//(approx ~320,000 particles)
//This can happen as the textures are updated in tiles, and it's possible for a particle
//to be shifted across a tile and recieve an invalid update. However the majority of the time,
//this would only cause a particle to be a frame behind or ahead. Worst case is the particle
//either dissapears or is duplicated.
//it is considered a worthwhile tradeoff for half the render target memory usage
this.positionSizeBufferB = positionSizeBufferA;
this.velocityRotationBufferB = velocityRotationBufferA;
this.colourBufferB = colourBufferA;
this.userBufferB = userBufferA;
#else
this.positionSizeBufferB = new DrawTargetTexture2D(camera, resolutionX, resolutionY, vec4Format);
this.velocityRotationBufferB = new DrawTargetTexture2D(camera, resolutionX, resolutionY, vec4Format);
if (useColourValues)
{
this.colourBufferB = new DrawTargetTexture2D(camera, resolutionX, resolutionY, vec4Format);
}
if (usesUserValues)
{
this.userBufferB = new DrawTargetTexture2D(camera, resolutionX, resolutionY, vec4Format);
}
#endif
//setup the render target groups (MRT)
DrawTargetTexture2D[] targets = new DrawTargetTexture2D[2 + (useColourValues ? 1 : 0) + (usesUserValues ? 1 : 0)];
targets[0] = positionSizeBufferA;
targets[1] = velocityRotationBufferA;
if (useColourValues)
{
targets[2] = colourBufferA;
}
if (usesUserValues)
{
targets[targets.Length - 1] = userBufferA;
}
this.mrtGroupA = new DrawTargetTexture2DGroup(camera, targets);
targets[0] = positionSizeBufferB;
targets[1] = velocityRotationBufferB;
if (useColourValues)
{
targets[2] = colourBufferB;
}
if (usesUserValues)
{
targets[targets.Length - 1] = userBufferB;
}
this.mrtGroupB = new DrawTargetTexture2DGroup(camera, targets);
this.mrtGroupA.ClearBuffer.Enabled = false;
this.mrtGroupB.ClearBuffer.Enabled = false;
if (usesLifeOrAge)
{
SurfaceFormat ageFormat = SurfaceFormat.HalfVector2;
if (!ParticleSystem.gpuVTexHalfVec2supported)
{
ageFormat = SurfaceFormat.HalfVector4;
if (!ParticleSystem.gpuVTexHalfVec4supported)
{
ageFormat = SurfaceFormat.Vector4;
}
}
#if XBOX360
lifeStoreBufferA = new DrawTargetTexture2D(camera, resolutionX, resolutionY, ageFormat);
lifeStoreBufferB = lifeStoreBufferA;
lifeStoreBufferA.ClearBuffer.Enabled = false;
lifeStoreBufferA.Add(new TexturedElement(lifeStoreBufferA, Vector2.One, true));
#else
lifeStoreBufferA = new DrawTargetTexture2D(camera, resolutionX, resolutionY, ageFormat);
lifeStoreBufferB = new DrawTargetTexture2D(camera, resolutionX, resolutionY, ageFormat);
lifeStoreBufferA.ClearBuffer.Enabled = false;
lifeStoreBufferB.ClearBuffer.Enabled = false;
//setup so that when a store buffer is drawn, it copies in the other buffer.
lifeStoreBufferA.Add(new TexturedElement(lifeStoreBufferB, Vector2.One, true));
lifeStoreBufferB.Add(new TexturedElement(lifeStoreBufferA, Vector2.One, true));
#endif
}
this.scissorTest = new Xen.Graphics.Modifier.ScissorModifier(0, 0, 1, 1);
//scissor off the MRT, as it uses a fullsize quad to run the particle logic for every particle
this.mrtGroupA.AddModifier(scissorTest);
this.mrtGroupB.AddModifier(scissorTest);
//this is the pass that runs per-frame logic on the particles
this.backgroundFillPass = new ShaderElement(this.processorData.FrameShader, new Vector2(1, 1), true);
this.mrtGroupA.Add(backgroundFillPass);
this.mrtGroupB.Add(backgroundFillPass);
this.mrtGroupA.Add(this);
this.mrtGroupB.Add(this);
if (usesLifeOrAge)
{
this.lifeStoreBufferA.Add(this);
#if !XBOX360
this.lifeStoreBufferB.Add(this);
#endif
}
}
