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PODOS ASCII Animation Lagging without constant input, Turbo C compiled
 

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  1. PODOS ASCII Animation Lagging without constant input, Turbo C compiled
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    <p>Here's an oddity from the past!</p> <p>I'm writing an ASCII Pong game for the command prompt (Yes yes oldschool) and I'm writing to the video memory directly (Add. 0xB8000000) so I know I'm rendering quickly (As opposed to gotoxy and then printf rendering)</p> <p>My code works fine, the code compiles fine under Turbo C++ V1.01 BUT the animation lags... now hold on hold on, there's a cavaet! Under my super fast boosted turbo Dell Core 2 Duo this seems logical however when I hold a key on the keyboard the animation becomes smooth as a newly compiled baby's bottom.</p> <p>I thought maybe it was because I was slowing the computer down by overloading the keyboard buffer (wtf really? come on...) but then I quickly smartened up and tried compiling for DJGPP and Tiny C Compiler to test if the results are the same. On Tiny C Compiler I found I coulnd't compile 'far' pointer types... still confused on that one but I was able to compile for DJGPP and it the animation ran smoothly!</p> <p>I want to compile this and have it work for Turbo C++ but this problem has been plagueing me for the past 3 days to no resolve. Does anyone know why the Turbo C++ constant calls to my rendering method (code below) will lag in the command prompt but DJGPP will not? I don't know if I'm compiling as debug or not, I don't even know how to check if I am. I did convert the code to ASM and I saw what looked to be debugging data at the header of the source so I don't know...</p> <p>Any and all comments and help will be greatly appreciated!</p> <p>Here is a quick example of what I'm up against, simple to compile so please check it out:</p> <pre><code>#include&lt;stdio.h&gt; #include&lt;conio.h&gt; #include&lt;dos.h&gt; #include&lt;time.h&gt; #define bX 80 #define bY 24 #define halfX bX/2 #define halfY bY/2 #define resolution bX*bY #define LEFT 1 #define RIGHT 2 void GameLoop(); void render(); void clearBoard(); void printBoard(); void ballLogic(); typedef struct { int x, y; }vertex; vertex vertexWith(int x, int y) { vertex retVal; retVal.x = x; retVal.y = y; return retVal; } vertex vertexFrom(vertex from) { vertex retVal; retVal.x = from.x; retVal.y = from.y; return retVal; } int direction; char far *Screen_base; char *board; vertex ballPos; void main() { Screen_base = (char far*)0xB8000000; ballPos = vertexWith(halfX, halfY); direction = LEFT; board = (char *)malloc(resolution*sizeof(char)); GameLoop(); } void GameLoop() { char input; clrscr(); clearBoard(); do { if(kbhit()) input = getch(); render(); ballLogic(); delay(50); }while(input != 'p'); clrscr(); } void render() { clearBoard(); board[ballPos.y*bX+ballPos.x] = 'X'; printBoard(); } void clearBoard() { int d; for(d=0;d&lt;resolution;d++) board[d] = ' '; } void printBoard() { int d; char far *target = Screen_base+d; for(d=0;d&lt;resolution;d++) { *target = board[d]; *(target+1) = LIGHTGRAY; ++target; ++target; } } void ballLogic() { vertex newPos = vertexFrom(ballPos); if(direction == LEFT) newPos.x--; if(direction == RIGHT) newPos.x++; if(newPos.x == 0) direction = RIGHT; else if(newPos.x == bX) direction = LEFT; else ballPos = vertexFrom(newPos); } </code></pre>
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    1. CODid you try making the "Repeat Delay" SHORT and Maximizing the "Repeat Rate" in keyboard settings in control panel?
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    2. COI don't see why keyboard settings would be a avenue of research, it's not the keyboard settings, pressing and holding a key was just a way to cause smooth rendering for some reason and I'd like to know why
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    3. CO"Repeat Delay" is exactly related to your question here. It means, that there is a delay between your first key event and the subsequent streaming key events. I suggest that you look at this in your keyboard settings. Let know what you find.
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