Initial commit of project.

source/soundThing.c

@@ -0,0 +1,94 @@
+#define _POSIX_C_SOURCE 200809L
+#include <stdio.h>
+#include <stdatomic.h>
+#include <pthread.h>
+#include <alloca.h>
+#include <alsa/asoundlib.h>
+#include "raylib.h"
+#include "synth.h"
+#include "midi.h"
+
+atomic_int gRunning = 1;
+
+static Synth     gSynth = {0};
+static MidiState gMidi  = {0};
+
+static void AudioOutputCallback(void *buffer, unsigned int frames)
+{
+    synthFillBuffer(&gSynth, (int16_t *)buffer, (int)frames);
+}
+
+static void drawWaveform(Waveform w, float dutyCycle, int x, int y, int width, int height)
+{
+    int steps = width;
+    for (int i = 0; i < steps - 1; i++) {
+        float phase0 = (float)i       / steps;
+        float phase1 = (float)(i + 1) / steps;
+        float s0 = waveformSample(w, phase0, dutyCycle);
+        float s1 = waveformSample(w, phase1, dutyCycle);
+
+        int cx = x + i;
+        int cy = y + (int)((1.0f - (s0 * 0.5f + 0.5f)) * height);
+        int nx = x + i + 1;
+        int ny = y + (int)((1.0f - (s1 * 0.5f + 0.5f)) * height);
+
+        DrawLine(cx, cy, nx, ny, GREEN);
+    }
+    DrawRectangleLines(x, y, width, height, DARKGRAY);
+}
+
+int main(void)
+{
+    const int sampleRate = 48000;
+
+    if (!midiInit(&gMidi, &gSynth)) return 1;
+    midiListInputs(&gMidi);
+
+    int srcClient, srcPort;
+    printf("\nEnter client and port to connect (e.g. '20 0'), or -1 -1 to skip: ");
+    if (scanf("%d %d", &srcClient, &srcPort) == 2 && srcClient != -1)
+        midiConnect(&gMidi, srcClient, srcPort);
+
+    pthread_t midiTid;
+    pthread_create(&midiTid, NULL, midiThread, &gMidi);
+
+    synthInit(&gSynth, (float)sampleRate);
+
+    InitWindow(800, 450, "SoundThing");
+    InitAudioDevice();
+    SetAudioStreamBufferSizeDefault(1024);
+
+    AudioStream stream = LoadAudioStream(sampleRate, 16, 1);
+    SetAudioStreamCallback(stream, AudioOutputCallback);
+    PlayAudioStream(stream);
+    SetTargetFPS(120);
+
+    while (!WindowShouldClose()) {
+        if (IsKeyPressed(KEY_UP))
+            gSynth.waveform = (gSynth.waveform + 1) % WAVE_COUNT;
+        if (IsKeyPressed(KEY_DOWN))
+            gSynth.waveform = (gSynth.waveform + WAVE_COUNT - 1) % WAVE_COUNT;
+
+        BeginDrawing();
+        ClearBackground(BLACK);
+
+        drawWaveform(gSynth.waveform, gSynth.dutyCycle, 20, 120, 400, 150);
+
+        DrawText("SoundThing", 20, 20, 24, RAYWHITE);
+        DrawText(TextFormat("Waveform: %s  (UP/DOWN to change)", waveformName(gSynth.waveform)),
+                 20, 55, 20, RAYWHITE);
+        DrawText(TextFormat("MIDI: client %d port %d", gMidi.client, gMidi.port),
+                 20, 90, 20, GRAY);
+
+        EndDrawing();
+    }
+
+    gRunning = 0;
+    StopAudioStream(stream);
+    UnloadAudioStream(stream);
+    CloseAudioDevice();
+    CloseWindow();
+    pthread_join(midiTid, NULL);
+    midiClose(&gMidi);
+    return 0;
+}