Hardware images - QB64 Wiki

Hardware images

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Hardware Images Using QB64GL


Demonstration of the Advantages of Using Hardware Images
Examples by Johny B.


The first example uses software images while using between 20 - 30% processor power:

SCREEN _NEWIMAGE(640, 480, 32) 'create some software screens scr_bg = _NEWIMAGE(640, 480, 32) scr_fg = _NEWIMAGE(50, 50, 32) 'draw to the background one, and make a nice pattern _DEST scr_bg FOR i = 1 TO 100 LINE (RND * 640, RND * 480)-(RND * 640, RND * 480), _RGBA32(RND * 255, RND * 255, RND * 255, RND * 255), BF NEXT i 'then do the same thing for the foreground _DEST scr_fg LINE (0, 0)-(50, 50), _RGBA32(255, 255, 255, 200), BF 'set image destination to main screen _DEST 0 DO CLS _PUTIMAGE , scr_bg _PUTIMAGE (x, y), scr_fg k = _KEYHIT SELECT CASE k CASE ASC("w"): y = y - 1 CASE ASC("a"): x = x - 1 CASE ASC("s"): y = y + 1 CASE ASC("d"): x = x + 1 END SELECT _DISPLAY 'render image after changes _LIMIT 30 'we're doing all this at 30 cycles/second LOOP


The second example converts the foreground and background software screens to hardware using 6-7% processor power:

SCREEN _NEWIMAGE(640, 480, 32) 'create some software screens scr_bg = _NEWIMAGE(640, 480, 32) scr_fg = _NEWIMAGE(50, 50, 32) 'draw to the background one, and make a nice pattern _DEST scr_bg FOR i = 1 TO 100 LINE (RND * 640, RND * 480)-(RND * 640, RND * 480), _RGBA32(RND * 255, RND * 255, RND * 255, RND * 255), BF NEXT i 'create a hardware screen version of the background scrh_bg = _COPYIMAGE(scr_bg, 33) _FREEIMAGE scr_bg 'we no longer need the software version in memory 'then do the same thing for the foreground _DEST scr_fg LINE (0, 0)-(50, 50), _RGBA32(255, 255, 255, 200), BF 'copy to hardware screen scrh_fg = _COPYIMAGE(scr_fg, 33) _FREEIMAGE scr_fg 'and free software screen from memory 'set image destination to main screen _DEST 0 _DISPLAYORDER _HARDWARE 'do not even render the software layer, just the hardware one. DO 'main program loop '_putimage knows these are hardware screens, so destination of 0 is taken as hardware layer _PUTIMAGE , scrh_bg _PUTIMAGE (x, y), scrh_fg 'just some input processing k = _KEYHIT SELECT CASE k CASE ASC("w"): y = y - 1 CASE ASC("a"): x = x - 1 CASE ASC("s"): y = y + 1 CASE ASC("d"): x = x + 1 END SELECT _DISPLAY 'render image after changes _LIMIT 30 'we're doing all this at 30 cycles/second LOOP


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