envelopesamplebuffer.h

Go to the documentation of this file.

#pragma once
//------------------------------------------------------------------------------
#include "particles/envelopecurve.h"
#include "particles/emitterattrs.h"
 
//------------------------------------------------------------------------------
namespace Particles
{
class EnvelopeSampleBuffer
{
public:
    EnvelopeSampleBuffer();
    ~EnvelopeSampleBuffer();
    
    void Setup(const EmitterAttrs& emitterAttrs, SizeT numSamples);
    void Discard();
    bool IsValid() const;
 
    IndexT AsSampleIndex(float t) const;
    float* LookupSamples(IndexT sampleIndex) const;
    SizeT GetNumSamples() const;
    const float* GetSampleBuffer() const;
 
private:
    SizeT numSamples;
    float* buffer;
};
 
//------------------------------------------------------------------------------
inline bool
EnvelopeSampleBuffer::IsValid() const
{
    return (0 != this->buffer);
}
 
//------------------------------------------------------------------------------
inline IndexT
EnvelopeSampleBuffer::AsSampleIndex(float t) const
{
    IndexT index = IndexT(t / this->numSamples);
 
    // make sure index is in valid range
    index = Math::clamp(index, 0, this->numSamples - 1);
    return index;
}
 
//------------------------------------------------------------------------------
inline float*
EnvelopeSampleBuffer::LookupSamples(IndexT sampleIndex) const
{
    #if NEBULA_BOUNDSCHECKS
    n_assert((sampleIndex >= 0) && (sampleIndex < this->numSamples));
    n_assert(0 != buffer);
    #endif
    return this->buffer + (sampleIndex * EmitterAttrs::NumEnvelopeAttrs);
}
 
//------------------------------------------------------------------------------
inline SizeT 
EnvelopeSampleBuffer::GetNumSamples() const 
{ 
    return this->numSamples; 
}
 
//------------------------------------------------------------------------------
inline const float* 
EnvelopeSampleBuffer::GetSampleBuffer() const 
{ 
    return this->buffer; 
}
 
} // namespace Particles
//------------------------------------------------------------------------------