BBC BASIC forum

How do I display a .jpg picture in SDL? *DISPLAY ( OSCLI "DISPLAY..." ) will display BMPs, GIFs, PNGs and JPGs (at least), but is slow. *MDISPLAY ( OSCLI "MDISPLAY..." ) is faster, but still not great. For your application I was anticipating that you would use the imglib library for maximum speed (...

Here's a little test of the speed improvement possible by calling an API function by address (numeric) rather than by name (string), which is made simpler by the SYS() function added in v1.15a: r%% = @memhdc% TIME = 0 FOR I% = 1 TO 10000 SYS "SDL_RenderDrawLine", r%%, RND(600), RND(500), RND(640), R...

Please feel no disquiet about posting BBC SDL material here: it clearly lies within the scope of this forum I know it lies within the scope of the forum as currently described, but in practice I don't think any forum members (at least active ones) use BBCSDL or have any real interest in it. I'd sug...

I have a feeling I've listed this code before, but either way it illustrates a trivial use of the extension to the PTR() pseudo-variable in BBCSDL v1.18a: PROC0 PTR(PROC0) = PTR(PROC1) PROC0 PTR(PROC0) = PTR(PROC2) PROC0 END DEF PROC0 : ENDPROC DEF PROC1 : PRINT "One" : ENDPROC DEF PROC2 : PRINT "Tw...

if they are really that offended then maybe they need to get a thicker skin. I think they would claim that they are not personally "offended" but that my presence is damaging the forum and the language, not least by putting off potential new members and users. That is the point which has been made ...

For at least the third time in recent years, a complaint has been made about my 'behaviour' and 'attitude' and it has been suggested that I should consider leaving the forum "for the good of the community as a whole". On previous occasions I have been persuaded to return after an 'acceptable' period...

( I am well aware that these posts anger some members of this forum, because they consider BBC BASIC for SDL 2.0 to be irrelevant. I apologise for once again causing annoyance, but the number of places where I can legitimately post this information is diminishing all the time. ) I've released versio...

though you CAN do it with ATN. Your original phrase was "can just use ATN", which implies that you don't need to know any additional information, which you do. you just need to check whether the answer is actually "on the right hand side" (i.e. x is positive) and correct. You could equally have sai...

Assuming you know y and x, then you can just use ATN Actually you can't: knowing both y and x means you can determine the angle completely, but ATN takes only one parameter so it gives an ambiguous result. The way to get the angle from y and x is to use the atan2 function, which takes two parameter...

KenDown wrote: ↑

Sat 28 Nov 2020, 20:36

I doubt similar smoothness could be achieved in BB4W.

So use BBCSDL instead. It has exactly the features you need:

• GPU-accelerated 2D graphics.
• GPU-accelerated image resizing.
• Built-in support for vSync.

resulting in it being both extremely fast and super-smooth.