VSYNC Question

painintheworld

Using VSYNC and FRAME, is there an appropriate method - if possible at all - to lock the screen refresh at 120? From playing around this evening, it is no problem going slower (all testing works great at balls to the wall speed, 60,30,etc), but I am not sure how to do 120. It isn't a deal breaker if it isn't possible.

I had an idea for something, so before forgetting the idea, I hammered out a very, very basic version of a little part of it. Code below:

1 'Excluding lines 960-980 speeds things up! 2 'Change fr values on line 990 to change refresh rate for drawing 3 'Yes, the code is sloppy...I had an idea this evening and 4 'knocked this our right fast 5 'Change RX or RY random values as desired 6 'Setting it to 5 and removing VSYNC makes 7 'the box go into spasms :) 10 CPUSPEED 100 20 X=227:Y=110 100 SCREEN 14:PALETTE 2 110 GOSUB &colorchart 150 maxx=PSIZE(0)-1:maxy=PSIZE(1)-1 160 centerx=INT(maxx/2) 165 centery=INT(maxy/2) 170 boxwidth=24:boxheight=24 180 OT=TICK() 300 WHILE INKEY$="" 305 NT=(TICK()-OT)/1000 310 OX=X:OY=Y 320 RX=RND(5):RY=RND(5) 330 IF RX=1 THEN 335 X=X+1 340 ENDIF 350 IF RY=2 THEN 355 Y=Y+1 360 ENDIF 365 IF RX=3 THEN 370 X=X-1 375 ENDIF 380 IF RY=4 THEN 385 Y=Y-1 390 ENDIF 400 IF X<0 THEN X=0 405 IF X>455 THEN X=455 410 IF Y<0 THEN Y=0 415 IF Y>245 THEN Y=245 430 IF OX<>X OR OY<>Y THEN 435 RECT OX,OY,OX+boxwidth,OY+boxheight,0,0 440 RECT X,Y,X+boxwidth,Y+boxwidth,orange,deepred 450 ENDIF 950 N=N+1 960 LOCATE 0,31 970 PRINT N;" ITERATIONS"; 975 LOCATE 0,32 980 PRINT NT;" SECONDS"; 985 fr=FRAME() 990 VSYNC fr+1 1000 WEND 1500 COLOR deepred:SCREEN 15:LIST 1999 END 5000 &colorchart 5005 deepred=RGB(188,30,30) 5010 orange=RGB(255,162,0) 5015 darkorange=RGB(209,132,0) 5020 yellow=RGB(247,255,0) 5025 yellow172=RGB(255,190,66) 5090 RETURN

painintheworld

Bumpity bump.

My reasoning for the above are to keep from:

1: Having to increment movements more pixels than ideal in a given bit of time.

2:...or having to eschew using VSYNC in parts and having to using fractional movements and take advantage of the speed of the CPU (if pad(0)=right then x=x+.0002 or something similar), and having visual tearing somewhere else. In addition, all of the other fractional stuff necessary.

Even if, to the human eye, moving an object 2 or 3 pixels at a time at 120Hz ends up looking the same as moving the same object 4 or 6 pixels at 60Hz, collisions of objects and their detection is bound to be much better the fewer pixels the object is moved.

painintheworld

Bump!