Method atan2

src/OpenColorIO/GpuShaderUtils.cpp:1309–1348

}

std::string GpuShaderText::atan2(const std::string & y,
                                 const std::string & x) const
{
    std::ostringstream kw;
    switch(m_lang)
    {
        case GPU_LANGUAGE_CG:
        case GPU_LANGUAGE_GLSL_1_2:
        case GPU_LANGUAGE_GLSL_1_3:
        case GPU_LANGUAGE_GLSL_4_0:
        case GPU_LANGUAGE_GLSL_VK_4_6:
        case GPU_LANGUAGE_GLSL_ES_1_0:
        case GPU_LANGUAGE_GLSL_ES_3_0:
        {
            // note: "atan" not "atan2"
            kw << "atan(" << y << ", " << x << ")";
            break;
        }
        case GPU_LANGUAGE_HLSL_SM_5_0:
        {
            // note: Various internet sources claim that the x & y arguments need to be
            // swapped for HLSL (relative to GLSL).  However, recent testing on Windows
            // has revealed that the argument order needs to be the same as GLSL.
            kw << "atan2(" << y << ", " << x << ")";
            break;
        }
        case LANGUAGE_OSL_1:
        case GPU_LANGUAGE_MSL_2_0:
        {
            kw << "atan2(" << y << ", " << x << ")";
            break;
        }

        default:
        {
            throw Exception("Unknown GPU shader language.");
        }
    }
    return kw.str();
}

std::string GpuShaderText::sign(const std::string & v) const
{