Add fast forward option

src/qt/languages/86box.pot

@@ -3002,3 +3002,6 @@ msgstr ""
 
 msgid "&Allow recompilation"
 msgstr ""
+
+msgid "&Fast forward"
+msgstr ""

src/qt/qt_main.cpp

@@ -100,6 +100,7 @@ extern int  qt_nvr_save(void);
 extern void exit_pause(void);
 
 bool cpu_thread_running = false;
+bool fast_forward = false;
 }
 
 #include <locale.h>
@@ -452,7 +453,7 @@ main_thread_fn()
 #endif
             drawits += static_cast<int>(new_time - old_time);
         old_time = new_time;
-        if (drawits > 0 && !dopause) {
+        if ((drawits > 0 || fast_forward) && !dopause) {
             /* Yes, so run frames now. */
             do {
 #ifdef USE_INSTRUMENT
@@ -478,8 +479,9 @@ main_thread_fn()
                 }
                 
                 drawits -= force_10ms ? 10 : 1;
-                if (drawits > 50)
+                if (drawits > 50 || fast_forward)
                     drawits = 0;
+
             } while (drawits > 0);
         } else {
             /* Just so we dont overload the host OS. */

src/qt/qt_mainwindow.cpp

@@ -65,6 +65,7 @@ extern int qt_nvr_save(void);
 #endif
 
 extern bool cpu_thread_running;
+extern bool fast_forward;
 };
 
 #include <QGuiApplication>
@@ -2135,6 +2136,12 @@ MainWindow::on_actionUpdate_mouse_every_CPU_frame_triggered()
     config_save();
 }
 
+void
+MainWindow::on_action_Fast_forward_triggered()
+{
+    fast_forward ^= 1;
+}
+
 void
 MainWindow::on_actionRemember_size_and_position_triggered()
 {

src/qt/qt_mainwindow.hpp

@@ -141,6 +141,7 @@ private slots:
     void on_actionPreferences_triggered();
     void on_actionEnable_Discord_integration_triggered(bool checked);
     void on_actionRenderer_options_triggered();
+    void on_action_Fast_forward_triggered();
 
     void refreshMediaMenu();
     void showMessage_(int flags, const QString &header, const QString &message, bool richText, std::atomic_bool *done = nullptr);

src/qt/qt_mainwindow.ui

@@ -78,6 +78,8 @@
     <addaction name="actionAuto_pause"/>
     <addaction name="actionPause"/>
     <addaction name="separator"/>
+    <addaction name="action_Fast_forward"/>
+    <addaction name="separator"/>
     <addaction name="actionForce_interpretation"/>
     <addaction name="separator"/>
     <addaction name="actionHard_Reset"/>
@@ -311,6 +313,8 @@
    <addaction name="separator"/>
    <addaction name="actionTake_screenshot"/>
    <addaction name="actionCopy_screenshot"/>
+   <addaction name="separator"/>
+   <addaction name="action_Fast_forward"/>
   </widget>
   <action name="actionForce_interpretation">
    <property name="icon">
@@ -1069,6 +1073,18 @@
     <string>&amp;8x</string>
    </property>
   </action>
+  <action name="action_Fast_forward">
+   <property name="checkable">
+    <bool>true</bool>
+   </property>
+   <property name="icon">
+    <iconset resource="../qt_resources.qrc">
+     <normaloff>:/settings/qt/icons/fast_forward.ico</normaloff>:/settings/qt/icons/fast_forward.ico</iconset>
+   </property>
+   <property name="text">
+    <string>&amp;Fast forward</string>
+   </property>
+  </action>
  </widget>
  <customwidgets>
   <customwidget>

src/sound/audio4.c

@@ -20,6 +20,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <math.h>
+#include <stdbool.h>
 
 #include <sys/audioio.h>
 #include <sys/param.h>
@@ -41,6 +42,7 @@
 #define I_MIDI 6
 
 static int audio[7] = {-1, -1, -1, -1, -1, -1, -1};
+extern bool fast_forward;
 
 #ifdef USE_NEW_API
 static struct audio_swpar info[7];
@@ -104,7 +106,7 @@ givealbuffer_common(const void *buf, const uint8_t src, const int size)
     double gain;
     int target_rate;
 
-    if(audio[src] == -1)
+    if(audio[src] == -1 || fast_forward)
         return;
 
     gain = sound_muted ? 0.0 : pow(10.0, (double) sound_gain / 20.0);

src/sound/openal.c

@@ -18,6 +18,7 @@
 #include <stdint.h>
 #include <stdio.h>
 #include <stdlib.h>
+#include <stdbool.h>
 #include <string.h>
 #undef AL_API
 #undef ALC_API
@@ -313,6 +314,7 @@ inital(void)
     initialized = 1;
 }
 
+extern bool fast_forward;
 void
 givealbuffer_common(const void *buf, const uint8_t src, const int size, const int freq)
 {
@@ -320,7 +322,7 @@ givealbuffer_common(const void *buf, const uint8_t src, const int size, const in
     int    state;
     ALuint buffer;
 
-    if (!initialized)
+    if (!initialized || fast_forward)
         return;
 
     alGetSourcei(source[src], AL_SOURCE_STATE, &state);
@@ -331,7 +333,7 @@ givealbuffer_common(const void *buf, const uint8_t src, const int size, const in
 
     alGetSourcei(source[src], AL_BUFFERS_PROCESSED, &processed);
     if (processed >= 1) {
-        const double gain = sound_muted ? 0.0 : pow(10.0, (double) sound_gain / 20.0);
+        const double gain = (sound_muted) ? 0.0 : pow(10.0, (double) sound_gain / 20.0);
         alListenerf(AL_GAIN, (float) gain);
 
         alSourceUnqueueBuffers(source[src], 1, &buffer);

src/sound/sndio.c

@@ -15,6 +15,7 @@
 #include <stdint.h>
 #include <unistd.h>
 #include <string.h>
+#include <stdbool.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <math.h>
@@ -32,6 +33,7 @@
 #define I_FDD 5
 #define I_HDD 6
 
+extern bool fast_forward;
 static struct sio_hdl* audio[7] = {NULL, NULL, NULL, NULL, NULL, NULL, NULL};
 static struct sio_par  info[7];
 static int             freqs[7] = { SOUND_FREQ, MUSIC_FREQ, WT_FREQ, CD_FREQ, SOUND_FREQ, SOUND_FREQ, 0 };
@@ -83,7 +85,7 @@ givealbuffer_common(const void *buf, const uint8_t src, const int size)
     int conv_size;
     double gain;
     int target_rate;
-    if (audio[src] == NULL)
+    if (audio[src] == NULL || fast_forward)
         return;
 
     gain = sound_muted ? 0.0 : pow(10.0, (double) sound_gain / 20.0);

src/sound/xaudio2.c

@@ -14,6 +14,7 @@
  */
 #include <math.h>
 #include <stdint.h>
+#include <stdbool.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
@@ -56,6 +57,8 @@ static IXAudio2SourceVoice    *srcvoicecd    = NULL;
 static IXAudio2SourceVoice    *srcvoicefdd   = NULL;
 static IXAudio2SourceVoice    *srcvoicehdd   = NULL;
 
+extern bool fast_forward;
+
 #define FREQ   SOUND_FREQ
 #define BUFLEN SOUNDBUFLEN
 
@@ -258,7 +261,7 @@ closeal(void)
 void
 givealbuffer_common(const void *buf, IXAudio2SourceVoice *sourcevoice, const size_t buflen)
 {
-    if (!initialized)
+    if (!initialized || fast_forward)
         return;
 
     (void) IXAudio2MasteringVoice_SetVolume(mastervoice, sound_muted ? 0.0 : pow(10.0, (double) sound_gain / 20.0),

src/unix/unix.c

@@ -63,6 +63,7 @@ int             update_icons;
 int             kbd_req_capture;
 int             hide_status_bar;
 int             hide_tool_bar;
+bool            fast_forward = false; // Technically unused.
 int             fixed_size_x = 640;
 int             fixed_size_y = 480;
 extern int      title_set;
@@ -596,10 +597,10 @@ main_thread(UNUSED(void *param))
 #endif
 
         old_time = new_time;
-        if (drawits > 0 && !dopause) {
+        if ((drawits > 0 || fast_forward) && !dopause) {
             /* Yes, so do one frame now. */
             drawits -= force_10ms ? 10 : 1;
-            if (drawits > 50)
+            if (drawits > 50 || fast_forward)
                 drawits = 0;
 
             /* Run a block of code. */