Add frame time and FPS calculation to profiling macros

2 files changed, 15 insertions, 3 deletions

diff --git a/src/common.h b/src/common.h
index 1fbfa4c..bbe6b52 100644
--- a/src/common.h
+++ b/src/common.h
@@ -735,6 +735,7 @@ wait_vsync(void) {
 #define LEN(ARR) (sizeof(ARR) / sizeof((ARR)[0]))
 
 // Fixed-point arithmetic for (i.P) numbers.
+#define FP_NUM(A,P)        ((A) << (P))
 #define FP_MUL(A,B,P)      (((A) * (B)) >> (P))
 #define FP_DIV(A,B,P)      (((A) << (P)) / (B))
 #define FP_LERP(Y0,Y1,X,P) ((Y0) + FP_MUL((X), ((Y1) - (Y0)), P))
diff --git a/src/main.c b/src/main.c
index c6242c2..a2a43d4 100644
--- a/src/main.c
+++ b/src/main.c
@@ -88,8 +88,19 @@
         txt_printf(">FLIP  %.8lu\n", avg_flip_cycles);\
         txt_printf("AUDIO  %.8lu\n", avg_mix_cycles);\
         txt_printf("TOTAL  %.8lu\n", avg_frame_cycles);\
-        screen_fill(BG_BACK, 0, 0, 8 * 16, 8 * 10, 0);\
-        flipbuf();\
+        u32 frame_time =\
+            FP_DIV(\
+                FP_NUM(avg_frame_cycles + 1, 2),\
+                FP_NUM(2809, 2),\
+                2) * 166;\
+        u32 fps =\
+            FP_DIV(\
+                FP_NUM(280896 * 60, 2),\
+                FP_NUM(avg_frame_cycles + 1, 2),\
+                2);\
+        txt_printf("TIME   %.8lu\n", frame_time >> 2);\
+        txt_printf("FPS    %.8lu\n", (fps >> 2) + 1);\
+        screen_fill(BG_BACK, 0, 0, 8 * 16, 8 * 12, 2);\
     } while (0)
 
 static u32 prof_frame_counter = 0;
@@ -727,7 +738,6 @@ main(void) {
     // NOTE: A VBLANK is 83776 cycles, anything other than that will make it so
     // we fail to render at 60FPS.
     while(true) {
-        PROF_SHOW();
         bios_vblank_wait();
         FRAME_START();
         PROF(handle_input(&u), input_cycles);
@@ -735,6 +745,7 @@ main(void) {
         PROF(sound_mix(), mix_cycles);
         // TODO: allow configuration to do VSYNC at 15 or 30 fps to avoid too
         // much memory copying on demanding uxn roms.
+        PROF_SHOW();
         PROF(flipbuf(), flip_cycles);
         frame_counter++;
         if (frame_counter == 60) {