feat: parse patch files from json

.vscode/settings.json

@@ -64,7 +64,20 @@
         "__string": "cpp",
         "compare": "cpp",
         "concepts": "cpp",
-        "numeric": "cpp"
+        "numeric": "cpp",
+        "__tree": "cpp",
+        "any": "cpp",
+        "deque": "cpp",
+        "forward_list": "cpp",
+        "fstream": "cpp",
+        "iomanip": "cpp",
+        "map": "cpp",
+        "shared_mutex": "cpp",
+        "span": "cpp",
+        "stack": "cpp",
+        "valarray": "cpp",
+        "ranges": "cpp",
+        "iostream": "cpp"
     },
     "FSharp.suggestGitignore": false,
 }

CMakeLists.txt

@@ -17,6 +17,10 @@ FetchContent_Declare(
 
 FetchContent_MakeAvailable(raylib)
 
+# Add nlohmann_json
+# FetchContent_Declare(json URL https://github.com/nlohmann/json/releases/download/v3.11.3/json.tar.xz)
+# FetchContent_MakeAvailable(json)
+
 # Adding our source files
 file(GLOB_RECURSE PROJECT_SOURCES CONFIGURE_DEPENDS "${CMAKE_CURRENT_LIST_DIR}/src/*.cpp") # Define PROJECT_SOURCES as a list of all source files
 set(PROJECT_INCLUDE "${CMAKE_CURRENT_LIST_DIR}/inc/") # Define PROJECT_INCLUDE to be the path to the include directory of the project
@@ -31,6 +35,7 @@ set_target_properties(
 target_sources(${PROJECT_NAME} PRIVATE ${PROJECT_SOURCES})
 target_include_directories(${PROJECT_NAME} PRIVATE ${PROJECT_INCLUDE})
 target_link_libraries(${PROJECT_NAME} PRIVATE raylib)
+# target_link_libraries(${PROJECT_NAME} PRIVATE json)
 
 # Setting ASSETS_PATH
 target_compile_definitions(${PROJECT_NAME} PUBLIC ASSETS_PATH="${CMAKE_CURRENT_SOURCE_DIR}/assets/") # Set the asset path macro to the absolute path on the dev machine

inc/Application.h

@@ -23,4 +23,5 @@ class Application {
     Application(/* args */);
     ~Application();
     void Run();
+    void ParsePatch(std::string file_path);
 };

inc/Oscillator.h

@@ -29,6 +29,7 @@ class Oscillator {
     ~Oscillator();
     OscillatorType GetType() { return m_osc; }
     void SetType(OscillatorType osc);
+    void SetType(std::string const& osc_name);
     float GetVolume() { return m_volume; }
     void SetVolume(float volume) { m_volume = volume; }
     float GetKey() { return m_key; }

inc/Synth.h

@@ -17,6 +17,7 @@ class Synth {
     std::vector<IEffect*> m_effects;
     std::vector<float> m_out_signal;
     LFO* m_lfo;
+    float m_lfo_level;
     void ZeroSignal();
     void GetNote();
     void TriggerNoteOnEffects();
@@ -36,5 +37,8 @@ class Synth {
     const bool& GetIsNoteTriggered() { return is_note_triggered; }
     ADSR* GetADSR() { return (ADSR*)m_effects[0]; }
     Filter* GetFilter() { return (Filter*)m_effects[1]; }
+    LFO* GetLFO() { return m_lfo; }
+    const float& GetLFOLevel() { return m_lfo_level; }
+    void SetLFOLevel(float lvl) { assert(0.f >= lvl <= 1.f); m_lfo_level = lvl; }
     void SetFilter(FilterType type);
 };

inc/SynthGuiState.h

@@ -1,6 +1,6 @@
 #pragma once
 #include "OscillatorType.h"
-#include "raygui.h"
+#include "raysan/raygui.h"
 #include <vector>
 #include "Filter.h"
 

src/Application.cpp

@@ -2,6 +2,10 @@
 #include "Logger.h"
 #include "Settings.h"
 #include <string>
+#include <fstream> //read file
+#include <cmath> // log10f
+#include <nlohmann/json.hpp>
+using json = nlohmann::json;
 
 Application::Application(/* args */) {
     InitSynth();
@@ -118,3 +122,33 @@ void Application::Run() {
         m_renderer.Draw(m_synth, m_synth_gui_state);
     }
 }
+
+void Application::ParsePatch(std::string file_path) {
+    std::ifstream f(file_path);
+    json data = json::parse(f);
+
+    auto oscillators = m_synth.GetOscillators();
+    for (int i = 0; i < oscillators.size(); i++) {
+        auto osc = oscillators[i];
+        osc->SetType(data["Oscillators"][i]["Wave"].template get<std::string>());
+        osc->SetVolume(data["Oscillators"][i]["Volume"].template get<float>());
+        osc->SetFine(data["Oscillators"][i]["Tune"].template get<float>());
+    }
+
+    auto adsr = m_synth.GetADSR();
+    auto adsr_params = data["ADSR"];
+    adsr->SetParameters(adsr_params["Attack"].template get<float>(),
+                        adsr_params["Decay"].template get<float>(),
+                        adsr_params["Sustain"].template get<float>(),
+                        adsr_params["Release"].template get<float>());
+
+    auto lfo = m_synth.GetLFO();
+    lfo->SetFreq(data["LFO"]["Freq"].template get<float>());
+    m_synth.SetLFOLevel(data["LFO"]["Level"].template get<float>());
+
+    m_synth.SetFilter((FilterType)data["Filter"]["Cutoff"].template get<int>());
+    auto filter = m_synth.GetFilter();
+    filter->SetParameters(std::log10f(data["Filter"]["Cutoff"].template get<float>()),
+                            data["Filter"]["Res"].template get<float>(),
+                            data["Filter"]["Drive"].template get<float>());
+}

src/Oscillator.cpp

@@ -43,6 +43,19 @@ void Oscillator::SetType(OscillatorType osc) {
     }
 }
 
+void Oscillator::SetType(std::string const& osc_name) {
+    if (osc_name == "Sine")
+        m_osc = Sine;
+    else if (osc_name == "Triangle")
+        m_osc = Triangle;
+    else if (osc_name == "Saw")
+        m_osc = Saw;
+    else if (osc_name == "Square")
+        m_osc = Square;
+    
+    SetType(m_osc);
+}
+
 void Oscillator::SetKey(float key) {
     m_key = key;
     float freq = KeyBoard::GetHzBySemitone(m_key + m_fine);

src/Renderer.cpp

@@ -7,7 +7,7 @@
 #pragma clang diagnostic ignored "-Wunused-but-set-variable"
 #pragma clang diagnostic ignored "-Wunused-variable"
 #pragma clang diagnostic ignored "-Wdeprecated-declarations"
-#include "raygui.h"
+#include "raysan/raygui.h"
 #pragma clang diagnostic pop
 
 Renderer::Renderer(/* args */) {

src/SeeSynth.cpp

@@ -1,7 +1,57 @@
 #include "Application.h"
+#include <string_view>
+#include <vector>
+#include <string>
+#include <iostream>
+
+inline bool file_exists(const std::string& name) {
+    if (FILE *file = fopen(name.c_str(), "r")) {
+        fclose(file);
+        return true;
+    } else {
+        return false;
+    }   
+}
+
+[[noreturn]] void print_help(char* const executable) {
+    std::cout << executable << " [options]\n" <<
+      "Options:\n" <<
+      "  -h | --help        Print this help\n" <<
+      "  -p | --patch       Path to a json file with a patch to apply\n" << 
+      "  -v | --version     Print a program version" << std::endl;
+    std::exit(0);
+}
+
+int main(int argc, char* argv[]) {
+    if (argc > 32) {
+        throw std::runtime_error("Too many input parameters!");
+    }
+
+    std::string patch_file_path;
+    for (int i = 0; i < argc; i++) {
+        auto arg = std::string(argv[i]);
+        if (arg == "-p" || arg == "--patch") {
+            patch_file_path = std::string(argv[i+1]);
+            if (patch_file_path.empty()) {
+                std::cerr << "no file path provided\n";
+                print_help(argv[0]);
+            }
+            else if (!file_exists(patch_file_path)) {
+                std::cerr << patch_file_path << ": no such file\n";
+                print_help(argv[0]);
+            }
+        }   
+        else if (arg == "-h" || arg == "--help") {
+            print_help(argv[0]);
+        }
+    }
 
-int main() {
     Application* app = new Application();
+    
+    if (!patch_file_path.empty()) {
+        app->ParsePatch(patch_file_path);
+    }
+
     app->Run();
 
     delete app;

src/Synth.cpp

@@ -7,7 +7,7 @@
 
 Synth::Synth(/* args */) {
     m_lfo = new LFO();
-    m_lfo->SetFreq(5.0);
+    m_lfo->SetFreq(2.0);
     AddOscillator();
     AddOscillator();
     AddEffect(new ADSR());
@@ -79,7 +79,7 @@ void Synth::ApplyFilterLfo() {
     float dt = m_lfo->Process();
     Filter* filter = (Filter*)m_effects[1];
     float freq = filter->GetFreq();
-    filter->SetParameters(freq + dt, filter->GetRes(), filter->GetPeakGain());
+    filter->SetParameters(freq + dt*0.5f, filter->GetRes(), filter->GetPeakGain());
 }
 
 void Synth::Process() {