TNearestPixelTex2D.h

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#pragma once
 
#include "Core/Texture/TPixelTex2D.h"
#include "Core/Texture/SampleLocation.h"
#include "Math/math.h"
 
namespace ph
{
 
template<typename T, std::size_t N>
class TNearestPixelTex2D : public TPixelTex2D<T, N>
{
public:
    using TPixelTex2D<T, N>::TPixelTex2D;
 
    inline void sample(
        const SampleLocation&  sampleLocation, 
        TTexPixel<T, N>* const out_value) const override
    {
        const uint32 w = this->getWidthPx();
        const uint32 h = this->getHeightPx();
 
        PH_ASSERT(w != 0 && h != 0);
 
        // normalize uv first to avoid overflowing xy after multiplying
        // width and height
        float64 normU, normV;
        this->normalizeUV(sampleLocation.uvw().x(), sampleLocation.uvw().y(),
                          &normU, &normV);
        
        // calculate pixel index and handle potential overflow
        uint32 x = static_cast<uint32>(normU * w);
        uint32 y = static_cast<uint32>(normV * h);
        x = x < w ? x : w - 1;
        y = y < h ? y : h - 1;
 
        this->getPixel(x, y, out_value);
    }
};
 
}// end namespace ph