WIP: controls

build.sh

@@ -1,5 +1,11 @@
 #!/bin/sh
 
 pushd build
-gcc -o sdlamp2 -Wall -O0 -ggdb3 ../src/sdlamp2.c `sdl2-config --cflags --libs`
+
+gcc -Wall -O0 -ggdb3 \
+  -o sdlamp2 \
+  `sdl2-config --cflags --libs` \
+  -lSDL2_image \
+  ../src/sdlamp2.c
+
 popd

src/sdlamp2.c

@@ -1,9 +1,17 @@
 #include "SDL.h"
+#include "SDL_image.h"
 
-static SDL_AudioDeviceID audio_device = 0;
 static SDL_Window *window = NULL;
 static SDL_Renderer *renderer = NULL;
 
+static SDL_AudioDeviceID audio_device = 0;
+static Uint8 *wavbuf = NULL;
+static Uint32 wavlen = 0;
+static SDL_AudioSpec wavspec;
+static SDL_AudioStream *stream = NULL;
+// static SDL_bool paused = SDL_TRUE;
+static SDL_bool paused = SDL_FALSE;
+
 static void panic_and_abort(const char *title, const char *text) {
   fprintf(stderr, "PANIC: %s ... %s\n", title, text);
   SDL_ShowSimpleMessageBox(SDL_MESSAGEBOX_ERROR, title, text, window);
@@ -11,10 +19,53 @@ static void panic_and_abort(const char *title, const char *text) {
   exit(1);
 }
 
+static SDL_bool load_audio_file(const char *fname) {
+  SDL_FreeAudioStream(stream);
+  stream = NULL;
+  SDL_FreeWAV(wavbuf);
+  wavbuf = NULL;
+  wavlen = 0;
+
+  if (SDL_LoadWAV(fname, &wavspec, &wavbuf, &wavlen) == NULL) {
+    SDL_ShowSimpleMessageBox(SDL_MESSAGEBOX_ERROR, "Couldn't load wav file!",
+                             SDL_GetError(), window);
+    return SDL_FALSE;
+  }
+
+  stream = SDL_NewAudioStream(wavspec.format, wavspec.channels, wavspec.freq,
+                              AUDIO_F32, 2, 48000);
+  if (!stream) {
+    SDL_ShowSimpleMessageBox(SDL_MESSAGEBOX_ERROR,
+                             "Couldn't create audio stream!", SDL_GetError(),
+                             window);
+    SDL_FreeWAV(wavbuf);
+    wavbuf = NULL;
+    wavlen = 0;
+  }
+
+  if (SDL_AudioStreamPut(stream, wavbuf, wavlen) ==
+      -1) { // FIXME(m): graceful handling.
+    panic_and_abort("Audio stream put failed!", SDL_GetError());
+  }
+  SDL_AudioStreamFlush(stream); // FIXME(m): error handling.
+  SDL_PauseAudioDevice(audio_device, paused);
+
+  return SDL_TRUE;
+}
+
 int main(int argc, char **argv) {
-  Uint8 *wavbuf = NULL;
-  Uint32 wavlen = 0;
-  SDL_AudioSpec wavspec;
+  SDL_AudioSpec desired;
+  SDL_bool running = SDL_TRUE;
+  const SDL_Rect rewind_rect = {10, 10, 100, 100};
+  const SDL_Rect stop_rect = {120, 10, 100, 100};
+  const SDL_Rect play_pause_rect = {230, 10, 100, 100};
+  const SDL_Rect fast_forward_rect = {340, 10, 100, 100};
+
+  const SDL_Rect rewind_symbol_rect = {0, 0, 200, 200};
+  const SDL_Rect play_symbol_rect = {220, 0, 200, 200};
+  const SDL_Rect fast_forward_symbol_rect = {440, 0, 200, 200};
+  const SDL_Rect stop_symbol_rect = {0, 220, 200, 200};
+  const SDL_Rect pause_symbol_rect = {220, 220, 200, 200};
 
   if (SDL_Init(SDL_INIT_VIDEO | SDL_INIT_AUDIO) != 0) {
     panic_and_abort("SDL_Init failed!", SDL_GetError());
@@ -31,23 +82,35 @@ int main(int argc, char **argv) {
     panic_and_abort("SDL_CreateRenderer failed!", SDL_GetError());
   }
 
-  if (SDL_LoadWAV("music.wav", &wavspec, &wavbuf, &wavlen) == NULL) {
-    panic_and_abort("Couldn't load wav file!", SDL_GetError());
-  }
-  audio_device = SDL_OpenAudioDevice(NULL, 0, &wavspec, NULL, 0);
+  SDL_zero(desired);
+  desired.freq = 48000;
+  desired.format = AUDIO_F32;
+  desired.channels = 2;
+  desired.samples = 4096;
+  desired.callback = NULL;
+
+  audio_device = SDL_OpenAudioDevice(NULL, 0, &desired, NULL, 0);
   if (audio_device == 0) {
     panic_and_abort("Could not open audio device!", SDL_GetError());
   }
-  SDL_QueueAudio(audio_device, wavbuf, wavlen);
 
-  SDL_bool paused = SDL_TRUE;
-  const SDL_Rect rewind_rect = {100, 100, 100, 100};
-  const SDL_Rect pause_rect = {400, 100, 100, 100};
+  load_audio_file("music.wav");
+
+  SDL_Surface *controls_surface = IMG_Load("controls.png");
+  if (controls_surface == NULL) {
+    panic_and_abort("Could not load controls asset!", SDL_GetError());
+  }
+
+  SDL_Texture *controls_texture =
+      SDL_CreateTextureFromSurface(renderer, controls_surface);
+  SDL_FreeSurface(controls_surface);
+  if (controls_texture == NULL) {
+    panic_and_abort("Could not load controls asset!", SDL_GetError());
+  }
 
-  SDL_bool running = SDL_TRUE;
   SDL_Event e;
-
   while (running) {
+    // Event loop
     while (SDL_PollEvent(&e)) {
       switch (e.type) {
       case SDL_QUIT:
@@ -56,10 +119,17 @@ int main(int argc, char **argv) {
 
       case SDL_MOUSEBUTTONDOWN: {
         const SDL_Point pt = {e.button.x, e.button.y};
-        if (SDL_PointInRect(&pt, &rewind_rect)) {
+        if (SDL_PointInRect(&pt, &rewind_rect)) { // Pressed the "rewind" button
           SDL_ClearQueuedAudio(audio_device);
-          SDL_QueueAudio(audio_device, wavbuf, wavlen);
-        } else if (SDL_PointInRect(&pt, &pause_rect)) {
+          SDL_AudioStreamClear(stream);
+          if (SDL_AudioStreamPut(stream, wavbuf, wavlen) ==
+              -1) { // FIXME(m): graceful handling.
+            panic_and_abort("Audio stream put failed!", SDL_GetError());
+          }
+          SDL_AudioStreamFlush(stream); // FIXME(m): error handling.
+        } else if (SDL_PointInRect(
+                       &pt,
+                       &play_pause_rect)) { // Pressed the "pause" button
           paused = paused ? SDL_FALSE : SDL_TRUE;
           SDL_PauseAudioDevice(audio_device, paused);
         }
@@ -68,16 +138,45 @@ int main(int argc, char **argv) {
       }
     }
 
-    SDL_SetRenderDrawColor(renderer, 0, 0xFF, 0, 0xFF);
+    // Deal with audio
+    if (SDL_GetQueuedAudioSize(audio_device) < 8192) {
+      const int bytes_remaining = SDL_AudioStreamAvailable(stream);
+      if (bytes_remaining > 0) {
+        const int new_bytes = SDL_min(bytes_remaining, 32 * 1024);
+        static Uint8 converted_buffer[32 * 1024];
+        SDL_AudioStreamGet(stream, converted_buffer,
+                           new_bytes); // FIXME(m): error handling.
+        SDL_QueueAudio(audio_device, converted_buffer, new_bytes);
+      }
+    }
+
+    // Deal with drawing to screen
+    SDL_SetRenderDrawColor(renderer, 0xFF, 0xFF, 0xFF, 0xFF);
     SDL_RenderClear(renderer);
 
     SDL_SetRenderDrawColor(renderer, 0xFF, 0xFF, 0xFF, 0xFF);
     SDL_RenderFillRect(renderer, &rewind_rect);
-    SDL_RenderFillRect(renderer, &pause_rect);
+    SDL_RenderFillRect(renderer, &stop_rect);
+    SDL_RenderFillRect(renderer, &play_pause_rect);
+    SDL_RenderFillRect(renderer, &fast_forward_rect);
+
+    SDL_RenderCopy(renderer, controls_texture, &rewind_symbol_rect,
+                   &rewind_rect);
+    SDL_RenderCopy(renderer, controls_texture, &stop_symbol_rect, &stop_rect);
+    if (paused) {
+      SDL_RenderCopy(renderer, controls_texture, &play_symbol_rect,
+                     &play_pause_rect);
+    } else {
+      SDL_RenderCopy(renderer, controls_texture, &pause_symbol_rect,
+                     &play_pause_rect);
+    }
+    SDL_RenderCopy(renderer, controls_texture, &fast_forward_symbol_rect,
+                   &fast_forward_rect);
 
     SDL_RenderPresent(renderer);
   }
 
+  // Clean up
   SDL_FreeWAV(wavbuf);
   SDL_CloseAudioDevice(audio_device);
   SDL_DestroyRenderer(renderer);