FPS checking.

alsa.c

@@ -142,8 +142,10 @@ static bool __alsa_stop(void *data)
 static void __alsa_set_nonblock_state(void *data, bool state)
 {
    alsa_t *alsa = data;
-   snd_pcm_nonblock(alsa->pcm, state);
-   alsa->nonblock = state;
+   if (snd_pcm_nonblock(alsa->pcm, state) < 0)
+      fprintf(stderr, "SSNES [ERROR]: Could not set PCM to non-blocking. Will not be able to fast-forward.\n");
+   else
+      alsa->nonblock = state;
 }
 
 static bool __alsa_start(void *data)

config.h

@@ -92,7 +92,7 @@ static const char* audio_device = NULL;
 static const int out_latency = 64;
 
 // Defines the quality (and cpu reqirements) of samplerate conversion.
-#define SAMPLERATE_QUALITY SRC_SINC_FASTEST
+#define SAMPLERATE_QUALITY SRC_LINEAR
 
 
 

gl.c

@@ -21,6 +21,7 @@
 #include <stdint.h>
 #include "libsnes.hpp"
 #include <stdio.h>
+#include <sys/time.h>
 
 static GLuint texture;
 static uint8_t *gl_buffer;
@@ -143,6 +144,12 @@ static void GLFWCALL resize(int width, int height)
    glLoadIdentity();
 }
 
+static float tv_to_fps(const struct timeval *tv, const struct timeval *new_tv, int frames)
+{
+   float time = new_tv->tv_sec - tv->tv_sec + (new_tv->tv_usec - tv->tv_usec)/1000000.0;
+   return frames/time;
+}
+
 static bool gl_frame(void *data, const uint16_t* frame, int width, int height)
 {
    (void)data;
@@ -175,6 +182,31 @@ static bool gl_frame(void *data, const uint16_t* frame, int width, int height)
 
    glEnd();
 
+   // Shows FPS in taskbar.
+   static int frames = 0;
+   static struct timeval tv;
+   struct timeval new_tv;
+   
+   if (frames == 0)
+      gettimeofday(&tv, NULL);
+
+   if ((frames % 60) == 0 && frames > 0)
+   {
+      gettimeofday(&new_tv, NULL);
+      struct timeval tmp_tv = {
+         .tv_sec = tv.tv_sec,
+         .tv_usec = tv.tv_usec
+      };
+      gettimeofday(&tv, NULL);
+      char tmpstr[256] = {0};
+
+      float fps = tv_to_fps(&tmp_tv, &new_tv, 60);
+
+      snprintf(tmpstr, sizeof(tmpstr) - 1, "SSNES || FPS: %6.1f || Frames: %d", fps, frames);
+      glfwSetWindowTitle(tmpstr);
+   }
+   frames++;
+
    glfwSwapBuffers();
 
    return true;

oss.c

@@ -111,10 +111,13 @@ static bool __oss_start(void *data)
 static void __oss_set_nonblock_state(void *data, bool state)
 {
    int *fd = data;
+   int rc;
    if (state)
-      fcntl(*fd, F_SETFL, fcntl(*fd, F_GETFL) | O_NONBLOCK);
+      rc = fcntl(*fd, F_SETFL, fcntl(*fd, F_GETFL) | O_NONBLOCK);
    else
-      fcntl(*fd, F_SETFL, fcntl(*fd, F_GETFL) & (~O_NONBLOCK));
+      rc = fcntl(*fd, F_SETFL, fcntl(*fd, F_GETFL) & (~O_NONBLOCK));
+   if (rc != 0)
+      fprintf(stderr, "SSNES [ERROR]: Could not set nonblocking on OSS file descriptor. Will not be able to fast-forward.\n");
 }
 
 static void __oss_free(void *data)