feat: add parameter range support

Signed-off-by: Christopher Arndt <chris@chrisarndt.de>

examples/faustlpf.c

@@ -3,14 +3,14 @@
 // This file was generated using the Faust compiler (https://faust.grame.fr),
 // and the Faust post-processor (https://github.com/SpotlightKid/faustpp).
 //
-// Source: lpf.dsp
+// Source: faustlpf.dsp
 // Name: FaustLPF
 // Author: Christopher Arndt
 // Copyright: Christopher Arndt, 2024
 // License: MIT
 // Version: 0.1.0
 // FAUST version: 2.75.10
-// FAUST compilation options: -a /home/chris/tmp/tmp9v2ck7tz.c -lang c -rui -ct 1 -fm def -cn faustlpf -es 1 -mcd 16 -mdd 1024 -mdy 33 -single -ftz 0 -vec -lv 0 -vs 32
+// FAUST compilation options: -a /home/chris/tmp/tmpebxwoqng.c -lang c -rui -ct 1 -fm def -cn faustlpf -es 1 -mcd 16 -mdd 1024 -mdy 33 -single -ftz 0 -vec -lv 0 -vs 32
 //------------------------------------------------------------------------------
 
 
@@ -79,9 +79,9 @@ void deletefaustlpf(faustlpf* dsp) {
 
 void metadatafaustlpf(MetaGlue* m) { 
 	m->declare(m->metaInterface, "author", "Christopher Arndt");
-	m->declare(m->metaInterface, "compile_options", "-a /home/chris/tmp/tmp9v2ck7tz.c -lang c -rui -ct 1 -fm def -cn faustlpf -es 1 -mcd 16 -mdd 1024 -mdy 33 -single -ftz 0 -vec -lv 0 -vs 32");
+	m->declare(m->metaInterface, "compile_options", "-a /home/chris/tmp/tmpebxwoqng.c -lang c -rui -ct 1 -fm def -cn faustlpf -es 1 -mcd 16 -mdd 1024 -mdy 33 -single -ftz 0 -vec -lv 0 -vs 32");
 	m->declare(m->metaInterface, "copyright", "Christopher Arndt, 2024");
-	m->declare(m->metaInterface, "filename", "lpf.dsp");
+	m->declare(m->metaInterface, "filename", "faustlpf.dsp");
 	m->declare(m->metaInterface, "filters.lib/fir:author", "Julius O. Smith III");
 	m->declare(m->metaInterface, "filters.lib/fir:copyright", "Copyright (C) 2003-2019 by Julius O. Smith III <jos@ccrma.stanford.edu>");
 	m->declare(m->metaInterface, "filters.lib/fir:license", "MIT-style STK-4.3 license");

examples/faustlpf.h

@@ -47,6 +47,11 @@ void initfaustlpf(faustlpf* dsp, int sample_rate);
 void buildUserInterfacefaustlpf(faustlpf* dsp, UIGlue* ui_interface);
 void computefaustlpf(faustlpf* dsp, int count, FAUSTFLOAT** RESTRICT inputs, FAUSTFLOAT** RESTRICT outputs);
 
+typedef struct {
+    FAUSTFLOAT init;
+    FAUSTFLOAT min;
+    FAUSTFLOAT max;
+} ParameterRange;
 
 int parameter_group(unsigned index) {
     switch (index) {
@@ -115,7 +120,18 @@ const char *parameter_unit(unsigned index) {
     }
 }
 
+const ParameterRange *parameter_range(unsigned index) {
+    switch (index) {
 
+    case 0: {
+        static const ParameterRange range = { 15000.0, 16.0, 15000.0 };
+        return ⦥
+    }
+
+    default:
+        return 0;
+    }
+}
 
 bool parameter_is_trigger(unsigned index) {
     switch (index) {

examples/faustlpf.nim

@@ -2,6 +2,8 @@
 
 type
     faustlpf* = object
+    ParameterRange* = object
+        init*, min*, max*: cfloat
     SampleBuffer* = UncheckedArray[cfloat]
 
 
@@ -11,6 +13,7 @@ proc initfaustlpf*(dsp: ptr faustlpf, sample_rate: cint) {.importc.}
 proc instanceClearfaustlpf*(dsp: ptr faustlpf) {.importc.}
 proc computefaustlpf*(dsp: ptr faustlpf, count: cint, inputs, outputs: ptr ptr SampleBuffer) {.importc.}
 
+proc parameter_range*(index: cuint): ptr ParameterRange {.importc.}
 proc parameter_group*(index: cuint): cint {.importc}
 proc parameter_is_boolean*(index: cuint): bool {.importc}
 proc parameter_is_enum*(index: cuint): bool {.importc}

examples/faustlpf_plugin.nim

@@ -50,7 +50,7 @@ proc activate(instance: Lv2Handle) {.cdecl.} =
 
 proc run(instance: Lv2Handle; nSamples: cuint) {.cdecl.} =
     let plug = cast[ptr FaustLPFPlugin](instance)
-    set_cutoff(plug.flt, plug.freq[])
+    plug.flt.set_cutoff(plug.freq[])
     computefaustlpf(plug.flt, nSamples.cint, addr plug.input, addr plug.output)