Function lerp

cmp_core/shaders/bc6_encode_kernel.cpp:4118–4143

}

static int lerp(int a, int b, int i, int denom)
{
    assert(denom == 3 || denom == 7 || denom == 15);
    assert(i >= 0 && i <= denom);

    int shift = 6, *weights = NULL;

    switch (denom)
    {
    case 3:
        denom *= 5;
        i *= 5;  // fall through to case 15
    case 15:
        weights = g_aWeights4;
        break;
    case 7:
        weights = g_aWeights3;
        break;
    default:
        assert(0);
    }

#pragma warning(disable : 4244)
    // no need to round these as this is an exact division
    return (int)(a * weights[denom - i] + b * weights[i]) / float(1 << shift);
}

static int finish_unquantize(AMD_BC6H_Format bc6h_format, int q)
{