Add FPS counter

source/build/include/build.h

@@ -510,7 +510,7 @@ EXTERN char *palookup[MAXPALOOKUPS];
 extern uint8_t *basepaltable[MAXBASEPALS];
 EXTERN uint8_t paletteloaded;
 EXTERN char *blendtable[MAXBLENDTABS];
-EXTERN uint8_t whitecol, redcol;
+EXTERN uint8_t whitecol, redcol, blackcol;
 
 EXTERN int32_t maxspritesonscreen;
 

source/build/src/palette.cpp

@@ -28,7 +28,6 @@ palette_t curpalette[256];			// the current palette, unadjusted for brightness o
 palette_t curpalettefaded[256];		// the current palette, adjusted for brightness and tint (ie. what gets sent to the card)
 palette_t palfadergb = { 0, 0, 0, 0 };
 char palfadedelta = 0;
-uint8_t blackcol;
 
 int32_t realmaxshade;
 float frealmaxshade;

source/exhumed/src/exhumed.cpp

@@ -2002,6 +2002,60 @@ static inline int32_t calc_smoothratio(ClockTicks totalclk, ClockTicks ototalclk
     return clamp(tabledivide64(65536*elapsedFrames*30, rfreq), 0, 65536);
 }
 
+int r_showfps;
+
+#define COLOR_RED redcol
+#define COLOR_WHITE whitecol
+
+#define LOW_FPS ((videoGetRenderMode() == REND_CLASSIC) ? 35 : 50)
+#define SLOW_FRAME_TIME 20
+
+#if defined GEKKO
+# define FPS_YOFFSET 16
+#else
+# define FPS_YOFFSET 0
+#endif
+
+#define FPS_COLOR(x) ((x) ? COLOR_RED : COLOR_WHITE)
+
+static void G_PrintFPS(void)
+{
+    static char tempbuf[256];
+    static int32_t frameCount;
+    static double cumulativeFrameDelay;
+    static double lastFrameTime;
+    static float lastFPS, minFPS = std::numeric_limits<float>::max(), maxFPS;
+    static double minGameUpdate = std::numeric_limits<double>::max(), maxGameUpdate;
+
+    double frameTime = timerGetHiTicks();
+    double frameDelay = frameTime - lastFrameTime;
+    cumulativeFrameDelay += frameDelay;
+
+    if (frameDelay >= 0)
+    {
+        int32_t x = (xdim <= 640);
+
+        if (r_showfps)
+        {
+            int32_t chars = Bsprintf(tempbuf, "%.1f ms, %5.1f fps", frameDelay, lastFPS);
+
+            printext256(windowxy2.x-(chars<<(3-x))+1, windowxy1.y+2+FPS_YOFFSET, blackcol, -1, tempbuf, x);
+            printext256(windowxy2.x-(chars<<(3-x)), windowxy1.y+1+FPS_YOFFSET,
+                FPS_COLOR(lastFPS < LOW_FPS), -1, tempbuf, x);
+        }
+
+        if (cumulativeFrameDelay >= 1000.0)
+        {
+            lastFPS = 1000.f * frameCount / cumulativeFrameDelay;
+            // g_frameRate = Blrintf(lastFPS);
+            frameCount = 0;
+            cumulativeFrameDelay = 0.0;
+        }
+        frameCount++;
+    }
+    lastFrameTime = frameTime;
+}
+
 static void GameDisplay(void)
 {
     // End Section B
@@ -2045,6 +2099,8 @@ static void GameDisplay(void)
         myprintext((320 - nLen) / 2, 100, "PAUSED", 0);
     }
 
+    G_PrintFPS();
+
     videoNextPage();
 }
 

source/exhumed/src/exhumed.h

@@ -210,6 +210,7 @@ enum {
 };
 
 extern char g_modDir[BMAX_PATH];
+extern int r_showfps;
 
 extern struct grpfile_t const* g_selectedGrp;
 

source/exhumed/src/osdcmds.cpp

@@ -615,7 +615,7 @@ int32_t registerosdcommands(void)
 
         //{ "r_camrefreshdelay", "minimum delay between security camera sprite updates, 120 = 1 second", (void *)&ud.camera_time, CVAR_INT, 1, 240 },
         //{ "r_drawweapon", "enable/disable weapon drawing", (void *)&ud.drawweapon, CVAR_INT, 0, 2 },
-        //{ "r_showfps", "show the frame rate counter", (void *)&ud.showfps, CVAR_INT, 0, 3 },
+        { "r_showfps", "show the frame rate counter", (void *)&r_showfps, CVAR_INT, 0, 3 },
         //{ "r_showfpsperiod", "time in seconds before averaging min and max stats for r_showfps 2+", (void *)&ud.frameperiod, CVAR_INT, 0, 5 },
         //{ "r_shadows", "enable/disable sprite and model shadows", (void *)&ud.shadows, CVAR_BOOL, 0, 1 },
         //{ "r_size", "change size of viewable area", (void *)&ud.screen_size, CVAR_INT|CVAR_FUNCPTR, 0, 64 },