diff options
Diffstat (limited to 'libs/ardour/parameter_descriptor.cc')
| -rw-r--r-- | libs/ardour/parameter_descriptor.cc | 29 |
1 files changed, 26 insertions, 3 deletions
diff --git a/libs/ardour/parameter_descriptor.cc b/libs/ardour/parameter_descriptor.cc index a63c90d1db..310ec1a483 100644 --- a/libs/ardour/parameter_descriptor.cc +++ b/libs/ardour/parameter_descriptor.cc @@ -143,6 +143,17 @@ ParameterDescriptor::ParameterDescriptor() void ParameterDescriptor::update_steps() { + /* sanitize flags */ + if (toggled || enumeration) { + logarithmic = false; + } + if (logarithmic && (upper <= lower || lower * upper <= 0)) { + logarithmic = false; + } + if (rangesteps < 2) { + rangesteps = 0; + } + if (unit == ParameterDescriptor::MIDI_NOTE) { step = smallstep = 1; // semitone largestep = 12; // octave @@ -153,10 +164,22 @@ ParameterDescriptor::update_steps() largestep = position_to_gain (dB_coeff_step(upper)); step = position_to_gain (largestep / 10.0); smallstep = step; + } else if (rangesteps > 1) { + const float delta = upper - lower; + + step = smallstep = (delta / (rangesteps - 1)); // XXX + largestep = std::min ((delta / 5.0f), 10.f * smallstep); // XXX + + if (logarithmic) { + smallstep = smallstep / logf (rangesteps); // XXX + step = step / logf (rangesteps); + largestep = largestep / logf (rangesteps); + } else if (integer_step) { + smallstep = 1.0; + step = std::max(1.f, rintf (rangesteps)); + largestep = std::max(1.f, rintf (largestep)); + } } else { - /* note that LV2Plugin::get_parameter_descriptor () - * overrides this is lv2:rangeStep is set for a port. - */ const float delta = upper - lower; /* 30 happens to be the total number of steps for a fader with default |