do SMARTSHADERs know what pixel they are altering?

jimmy99 · Aug 17, 2005, 07:35 PM

Hey!

Im just getting my feet wet into writing SMARTSHADERs. Your tutorial page has been a huge help so far.

I see that you can get the height and width of the current window, and also that conditionals are supported. I understand that the shader program will run for every pixel to be displayed. Can the SMARTSHADER program get the information as to what pixel it is currently altering?

What i wanted to setup was different effects being seperated on the screen at the same time. Something along the lines of:

if (currentPixel < width / 2)
doEffect1;
else
doEffect2;

in essance there'd be a vertical line seperating the 2 effects on the screen. effect1 on the left and effect2 on the right.

So is there some command that will return this info rather than my fictional currentPixel? Thanks!

Aug 17, 2005, 07:35 PM	#1
jimmy99 DriverHeaven Newbie Join Date: Aug 2005 Posts: 2 Rep Power: 0	do SMARTSHADERs know what pixel they are altering? Hey! Im just getting my feet wet into writing SMARTSHADERs. Your tutorial page has been a huge help so far. I see that you can get the height and width of the current window, and also that conditionals are supported. I understand that the shader program will run for every pixel to be displayed. Can the SMARTSHADER program get the information as to what pixel it is currently altering? What i wanted to setup was different effects being seperated on the screen at the same time. Something along the lines of: if (currentPixel < width / 2) doEffect1; else doEffect2; in essance there'd be a vertical line seperating the 2 effects on the screen. effect1 on the left and effect2 on the right. So is there some command that will return this info rather than my fictional currentPixel? Thanks!