Function AddLogShader

src/OpenColorIO/ops/log/LogOpGPU.cpp:18–50

{

void AddLogShader(GpuShaderCreatorRcPtr & shaderCreator, ConstLogOpDataRcPtr & /* logData */, float base)
{
    const float minValue = std::numeric_limits<float>::min();

    GpuShaderText st(shaderCreator->getLanguage());

    st.indent();
    st.newLine() << "";
    st.newLine() << "// Add Log processing";
    st.newLine() << "";
    st.newLine() << "{";
    st.indent();

    const std::string pix(shaderCreator->getPixelName());
    const std::string pixrgb = pix + std::string(".rgb");

    st.newLine() << pixrgb << " = max( " << st.float3Const(minValue) << ", " << pixrgb << ");";

    if (base == 2.0f)
    {
        st.newLine() << pixrgb << " = log2(" << pixrgb << ");";
    }
    else // base 10
    {
        const float oneOverLog10 = 1.0f / logf(base);
        st.newLine() << pixrgb << " = log(" << pixrgb << ") * " << st.float3Const(oneOverLog10) << ";";
    }

    st.dedent();
    st.newLine() << "}";

    shaderCreator->addToFunctionShaderCode(st.string().c_str());
}

void AddAntiLogShader(GpuShaderCreatorRcPtr & shaderCreator, ConstLogOpDataRcPtr & /* logData */, float base)
{