Function _setNormalizedPluginParameterValue

distrho/src/DistrhoPluginVST3.cpp:710–756

    }

    void _setNormalizedPluginParameterValue(const uint32_t index, const double normalized)
    {
        const ParameterRanges& ranges(fPlugin.getParameterRanges(index));
        const uint32_t hints = fPlugin.getParameterHints(index);
        float value = ranges.getUnnormalizedValue(normalized);

        // convert as needed as check for changes
        if (hints & kParameterIsBoolean)
        {
            const float midRange = ranges.min + (ranges.max - ranges.min) / 2.f;
            const bool isHigh = value > midRange;

            if (isHigh == (fCachedParameterValues[kVst3InternalParameterBaseCount + index] > midRange))
                return;

            value = isHigh ? ranges.max : ranges.min;
        }
        else if (hints & kParameterIsInteger)
        {
            const int ivalue = d_roundToInt(value);

            if (d_roundToInt(fCachedParameterValues[kVst3InternalParameterBaseCount + index]) == ivalue)
                return;

            value = ivalue;
        }
        else
        {
            // deal with low resolution of some hosts, which convert double to float internally and lose precision
            if (std::abs(ranges.getNormalizedValue(static_cast<double>(fCachedParameterValues[kVst3InternalParameterBaseCount + index])) - normalized) < 0.0000001)
                return;
        }

        fCachedParameterValues[kVst3InternalParameterBaseCount + index] = value;

      #if DISTRHO_PLUGIN_HAS_UI
       #if DPF_VST3_USES_SEPARATE_CONTROLLER
        if (!fIsComponent)
       #endif
        {
            fParameterValueChangesForUI[kVst3InternalParameterBaseCount + index] = true;
        }
      #endif

        if (!fPlugin.isParameterOutputOrTrigger(index))
            fPlugin.setParameterValue(index, value);
    }

    // ----------------------------------------------------------------------------------------------------------------
    // stuff called for UI creation