Fast Screen Updates

[rdc]

A little example of using pointers and memcpy to speed up screen updates.

Code Select Expand


#Include "fbgfx.bi"
#Include "crt.bi"

#Define sw 640
#Define sh 480

ScreenRes sw, sh, 32

Dim buffer As UInteger Ptr
buffer = Callocate(sw * sh, SizeOf(UInteger))

For y As Integer = 0 To sh - 1
   For x As Integer = 0 To sw - 1
      'Write to buffer.
      buffer[y * sw + x] = RGB(0, 255, 0)
   Next
Next

'Copy buffer to screen. 
ScreenLock
memcpy ScreenPtr, buffer, sw*sh*4
ScreenUnLock
   
   
Sleep


[Shockwave]

Would work nice for drawing background graphics as well, nice one Rick

[rdc]

Thanks.

[Clyde]

Nice one RDC, i've been learning a similar system for Gravity.