refactor: do param bounds checking in C code

Some more code re-arranging

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

examples/faustlpf_plugin.nim

@@ -2,24 +2,22 @@
 
 import nymph
 
-{.emit: "#include \"lpf.h\"".}
+{.emit: """#include "lpf.h"""".}
 
 const
     PluginUri = "urn:nymph:examples:faustlpf"
-    minFreq = 16.0
-    maxFreq = 15_000.0
 
 type
-    SampleBuffer = UncheckedArray[cfloat]
-
     faustlpf {.importc, header: "lpf.h".} = object
-        # struct field, which represents the value of the
+        # struct field representing the value of the FAUST UI element,
-        # FAUST UI element, which controls the cutoff
+        # which controls the filter cutoff frequency
         fHslider0: cfloat
 
     PluginPort {.pure.} = enum
         Input, Output, Frequency
 
+    SampleBuffer = UncheckedArray[cfloat]
+
     FaustLPFPlugin = object
         input: ptr SampleBuffer
         output: ptr SampleBuffer
@@ -34,6 +32,8 @@ 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 NimMain() {.cdecl, importc.}
+
 
 proc instantiate(descriptor: ptr Lv2Descriptor; sampleRate: cdouble;
                  bundlePath: cstring; features: ptr UncheckedArray[ptr Lv2Feature]):
@@ -66,8 +66,7 @@ proc activate(instance: Lv2Handle) {.cdecl.} =
 
 proc run(instance: Lv2Handle; nSamples: cuint) {.cdecl.} =
     let plug = cast[ptr FaustLPFPlugin](instance)
-    plug.flt.fHslider0 = plug.freq[].clamp(minFreq, maxFreq)
+    plug.flt.fHslider0 = plug.freq[]
-
     computefaustlpf(plug.flt, nSamples.cint, addr plug.input, addr plug.output)
 
 
@@ -85,9 +84,6 @@ proc extensionData(uri: cstring): pointer {.cdecl.} =
     return nil
 
 
-proc NimMain() {.cdecl, importc.}
-
-
 proc lv2Descriptor(index: cuint): ptr Lv2Descriptor {.
                    cdecl, exportc, dynlib, extern: "lv2_descriptor".} =
     NimMain()

examples/lpf.h

@@ -5,7 +5,7 @@ license: "MIT"
 name: "FaustLPF"
 version: "0.1.0"
 Code generated with Faust 2.74.6 (https://faust.grame.fr)
-Compilation options: -a ./examples/minarch.h -lang c -ct 1 -cn faustlpf -es 1 -mcd 16 -mdd 1024 -mdy 33 -single -ftz 0 -vec -lv 0 -vs 32
+Compilation options: -a ./examples/minarch.h -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
 ------------------------------------------------------------ */
 
 #ifndef  __faustlpf_H__
@@ -17,14 +17,8 @@ Compilation options: -a ./examples/minarch.h -lang c -ct 1 -cn faustlpf -es 1 -m
  FAUST Architecture File for generating a very minimal C interface
  ************************************************************************/
 
-#include <math.h>
-#include <stdio.h>
-
 #include "faust/gui/CInterface.h"
 
-#define max(a,b) ((a < b) ? b : a)
-#define min(a,b) ((a < b) ? a : b)
-
 /******************************************************************************
  VECTOR INTRINSICS
 *******************************************************************************/
@@ -47,6 +41,7 @@ extern "C" {
 #define RESTRICT __restrict__
 #endif
 
+#include "faust/dsp/fastmath.cpp"
 #include <math.h>
 #include <stdint.h>
 #include <stdlib.h>
@@ -86,7 +81,7 @@ void deletefaustlpf(faustlpf* dsp) {
 
 void metadatafaustlpf(MetaGlue* m) { 
 	m->declare(m->metaInterface, "author", "Christopher Arndt");
-	m->declare(m->metaInterface, "compile_options", "-a ./examples/minarch.h -lang c -ct 1 -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 ./examples/minarch.h -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, "filters.lib/fir:author", "Julius O. Smith III");
@@ -191,7 +186,7 @@ void buildUserInterfacefaustlpf(faustlpf* dsp, UIGlue* ui_interface) {
 void computefaustlpf(faustlpf* dsp, int count, FAUSTFLOAT** RESTRICT inputs, FAUSTFLOAT** RESTRICT outputs) {
 	FAUSTFLOAT* input0_ptr = inputs[0];
 	FAUSTFLOAT* output0_ptr = outputs[0];
-	float fSlow0 = dsp->fConst1 * (float)(dsp->fHslider0);
+	float fSlow0 = dsp->fConst1 * fmaxf(16.0f, fminf(1.5e+04f, (float)(dsp->fHslider0)));
 	float fRec1_tmp[36];
 	float* fRec1 = &fRec1_tmp[4];
 	float fZec0[32];
@@ -236,7 +231,7 @@ void computefaustlpf(faustlpf* dsp, int count, FAUSTFLOAT** RESTRICT inputs, FAU
 		{
 			int i;
 			for (i = 0; i < vsize; i = i + 1) {
-				fZec0[i] = tanf(dsp->fConst3 * fRec1[i]);
+				fZec0[i] = fast_tanf(dsp->fConst3 * fRec1[i]);
 			}
 		}
 		/* Vectorizable loop 2 */
@@ -328,7 +323,7 @@ void computefaustlpf(faustlpf* dsp, int count, FAUSTFLOAT** RESTRICT inputs, FAU
 		{
 			int i;
 			for (i = 0; i < vsize; i = i + 1) {
-				fZec0[i] = tanf(dsp->fConst3 * fRec1[i]);
+				fZec0[i] = fast_tanf(dsp->fConst3 * fRec1[i]);
 			}
 		}
 		/* Vectorizable loop 2 */

examples/minarch.h

@@ -4,14 +4,8 @@
  FAUST Architecture File for generating a very minimal C interface
  ************************************************************************/
 
-#include <math.h>
-#include <stdio.h>
-
 #include "faust/gui/CInterface.h"
 
-#define max(a,b) ((a < b) ? b : a)
-#define min(a,b) ((a < b) ? a : b)
-
 /******************************************************************************
  VECTOR INTRINSICS
 *******************************************************************************/