Dark Bit Factory & Gravity

PROGRAMMING => Freebasic => Topic started by: rdc on June 25, 2009

Title: Fast Screen Updates
Post by: rdc on June 25, 2009

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

Code: [Select]

#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


Title: Re: Fast Screen Updates
Post by: Shockwave on June 25, 2009

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

Title: Re: Fast Screen Updates
Post by: rdc on June 25, 2009

Thanks.

Title: Re: Fast Screen Updates
Post by: Clyde on June 25, 2009

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