Some fast forwarding support.

config.h

@@ -117,6 +117,7 @@ static const struct snes_keybind snes_keybinds[] = {
    { SNES_DEVICE_ID_JOYPAD_DOWN,    GLFW_KEY_DOWN,             11 },
    { SNES_DEVICE_ID_JOYPAD_START,   GLFW_KEY_ENTER,            6 },
    { SNES_DEVICE_ID_JOYPAD_SELECT,  GLFW_KEY_RSHIFT,           14 },
+   { SNES_FAST_FORWARD_KEY,         GLFW_KEY_SPACE,            9 },
    { -1 }
 };
 

driver.h

@@ -24,6 +24,9 @@
 #include <stdint.h>
 #include <unistd.h>
 
+#define SNES_FAST_FORWARD_KEY 0x666 // Hurr, durr
+void set_fast_forward_button(bool state);
+
 struct snes_keybind
 {
    int id;
@@ -48,6 +51,7 @@ typedef struct audio_driver
    ssize_t (*write)(void* data, const void* buf, size_t size);
    bool (*stop)(void* data);
    bool (*start)(void* data);
+   void (*set_nonblock_state)(void* data, bool toggle); // Should we care about blocking in audio thread? Fast forwarding.
    void (*free)(void* data);
 } audio_driver_t;
 
@@ -64,6 +68,7 @@ typedef struct video_driver
    void* (*init)(video_info_t *video, const input_driver_t **input); 
    // Should the video driver act as an input driver as well? :)
    bool (*frame)(void* data, const uint16_t* frame, int width, int height);
+   void (*set_nonblock_state)(void* data, bool toggle); // Should we care about syncing to vblank? Fast forwarding.
    void (*free)(void* data);
 } video_driver_t;
 

gl.c

@@ -29,7 +29,7 @@ static GLuint tex_filter;
 
 typedef struct gl
 {
-   int foo;
+   bool vsync;
 } gl_t;
 
 
@@ -68,11 +68,22 @@ static int16_t glfw_input_state(void *data, const struct snes_keybind *snes_keyb
       glfwGetJoystickButtons(joypad_id, buttons, joypad_buttons);
    }
 
+   // Finds fast forwarding state.
+   for ( i = 0; snes_keybinds[i].id != -1; i++ )
+   {
+      if ( snes_keybinds[i].id == SNES_FAST_FORWARD_KEY )
+      {
+         if ( snes_keybinds[i].joykey < joypad_buttons )
+            set_fast_forward_button(buttons[snes_keybinds[i].joykey] == GLFW_PRESS);
+         break;
+      }
+   }
+
    for ( i = 0; snes_keybinds[i].id != -1; i++ )
    {
       if ( snes_keybinds[i].id == (int)id )
       {
-         if ( glfwGetKey(snes_keybinds[i].key ))
+         if ( glfwGetKey(snes_keybinds[i].key) )
             return 1;
          
          if ( snes_keybinds[i].joykey < joypad_buttons && buttons[snes_keybinds[i].joykey] == GLFW_PRESS )
@@ -171,10 +182,22 @@ static void gl_free(void *data)
    free(gl_buffer);
 }
 
+static void gl_set_nonblock_state(void *data, bool state)
+{
+   gl_t *gl = data;
+   if (gl->vsync)
+   {
+      if (state)
+         glfwSwapInterval(0);
+      else
+         glfwSwapInterval(1);
+   }
+}
+
 static void* gl_init(video_info_t *video, const input_driver_t **input)
 {
-   gl_t *foo = malloc(sizeof(gl_t));
-   if ( foo == NULL )
+   gl_t *gl = malloc(sizeof(gl_t));
+   if ( gl == NULL )
       return NULL;
 
    keep_aspect = video->force_aspect;
@@ -200,6 +223,7 @@ static void* gl_init(video_info_t *video, const input_driver_t **input)
       glfwSwapInterval(1); // Force vsync
    else
       glfwSwapInterval(0);
+   gl->vsync = video->vsync;
 
    gl_buffer = malloc(256 * 256 * 2 * video->input_scale * video->input_scale);
    if ( !gl_buffer )
@@ -225,12 +249,13 @@ static void* gl_init(video_info_t *video, const input_driver_t **input)
          GL_UNSIGNED_SHORT_1_5_5_5_REV, gl_buffer);
 
    *input = &input_glfw;
-   return foo;
+   return gl;
 }
 
 const video_driver_t video_gl = {
    .init = gl_init,
    .frame = gl_frame,
+   .set_nonblock_state = gl_set_nonblock_state,
    .free = gl_free
 };
    

rsound.c

@@ -25,6 +25,7 @@ typedef struct rsd
    rsound_t *rd;
    int latency;
    int rate;
+   int nonblock;
 } rsd_t;
 
 static void* __rsd_init(const char* device, int rate, int latency)
@@ -74,6 +75,9 @@ static ssize_t __rsd_write(void* data, const void* buf, size_t size)
 {
    rsd_t *rsd = data;
 
+   if ( rsd_delay_ms(rsd->rd) > rsd->latency && rsd->nonblock )
+      return 0;
+
    if ( size == 0 )
       return 0;
 
@@ -101,6 +105,12 @@ static bool __rsd_stop(void *data)
    return true;
 }
 
+static void __rsd_set_nonblock_state(void *data, bool state)
+{
+   rsd_t *rsd = data;
+   rsd->nonblock = state;
+}
+
 static bool __rsd_start(void *data)
 {
    rsd_t *rsd = data;
@@ -124,6 +134,7 @@ const audio_driver_t audio_rsound = {
    .write = __rsd_write,
    .stop = __rsd_stop,
    .start = __rsd_start,
+   .set_nonblock_state = __rsd_set_nonblock_state,
    .free = __rsd_free
 };
 

ssnes.c

@@ -70,6 +70,21 @@ static void write_file(const char* path, uint8_t* data, size_t size);
 static void load_save_file(const char* path, int type);
 static void save_file(const char* path, int type);
 
+
+// To avoid continous switching if we hold the button down, we require that the button must go from pressed, unpressed back to pressed to be able to toggle between then.
+void set_fast_forward_button(bool new_button_state)
+{
+   static bool old_button_state = false;
+   static bool syncing_state = false;
+   if (new_button_state && !old_button_state)
+   {
+      syncing_state = !syncing_state;
+      driver.video->set_nonblock_state(driver.video_data, syncing_state);
+      driver.audio->set_nonblock_state(driver.audio_data, syncing_state);
+   }
+   old_button_state = new_button_state;
+}
+
 static void init_drivers(void)
 {
    init_video_input();