Ignore alpha channel in Bitmap

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Ignore alpha channel in Bitmap #365957 03/30/11 18:18 03/30/11 18:18
Joined: Apr 2008 Posts: 650 Sajeth OP User
Sajeth OP User Joined: Apr 2008 Posts: 650	Hello, how can I tell the engine to ignore the alpha channel of a panel bitmap? I'd like to have it fully solid and only use the alpha channel for collision processing. Is this possible? Teleschrott-Fan.

Re: Ignore alpha channel in Bitmap [Re: Sajeth] #365958 03/30/11 18:37 03/30/11 18:37
Joined: Jan 2002 Posts: 4,225 Germany / Essen Uhrwerk Expert
Uhrwerk Expert Joined: Jan 2002 Posts: 4,225 Germany / Essen	You can ignore the alpha channel of a bitmap by assigning a material to it, that has its PASS_SOLID flag set. This will render the bitmap as if the alpha channel wasn't there. However, I have no clue what you mean by "use the alpha channel for collision processing". That does not make any sense to me. Could you explain that in more detail? Always learn from history, to be sure you make the same mistakes again...

Re: Ignore alpha channel in Bitmap [Re: Uhrwerk] #365962
03/30/11 19:15 03/30/11 19:15

Joined: Jul 2008
Posts: 1,178
England

MrGuest

Serious User

MrGuest

Serious User

Joined: Jul 2008
Posts: 1,178
England

Hey Sajeth,

I created a function for testing if mouse clicked on alpha layer over 10

Code:

void billboard_click(PANEL* pnl){
	
	if(var_bullets){
		
		var alpha;
		var format = bmap_lock(pnl.bmap, 0);
		
		int x = (mouse_pos.x - pnl.pos_x) / pnl.scale_x;
		int y = (mouse_pos.y - pnl.pos_y) / pnl.scale_y;
		var pixel = pixel_for_bmap(pnl.bmap, x, y);
		COLOR col;
		
		pixel_to_vec(col, alpha, format, pixel);
		bmap_unlock(pnl.bmap);
		
		
		if(alpha > 10){
			kill_handler(pnl, pnl.scale_x, pnl.pos_y);
		}else{
		}
	}
}

hopefully it's easy enough to understand

Re: Ignore alpha channel in Bitmap [Re: MrGuest] #365965 03/30/11 20:02 03/30/11 20:02
Joined: Apr 2008 Posts: 650 Sajeth OP User
Sajeth OP User Joined: Apr 2008 Posts: 650	I was going to do exactly what MrGuest coded, but I want the panel to be solid, no matter what the alpha channel says - so the panel rendering process just ignores the alpha channel and renders the bitmap with no transparency anyways. Well, looks like I'd just have to use a separate file for this... Originally Posted By: Uhrwerk You can ignore the alpha channel of a bitmap by assigning a material to it, that has its PASS_SOLID flag set. This will render the bitmap as if the alpha channel wasn't there. However, I have no clue what you mean by "use the alpha channel for collision processing". That does not make any sense to me. Could you explain that in more detail? Material geht leider schlecht, weilsn Panel ist - ich will den Alphakanal manuell auslesen und f�r die Kollisionserkennung benutzen, die Bitmap an sich soll aber dargestellt werden, als h�tte sie keinen - also ohne Transparenz Last edited by Sajeth; 03/30/11 20:04. Teleschrott-Fan.

Re: Ignore alpha channel in Bitmap [Re: Sajeth] #365966 03/30/11 20:14 03/30/11 20:14
Joined: Jan 2002 Posts: 4,225 Germany / Essen Uhrwerk Expert
Uhrwerk Expert Joined: Jan 2002 Posts: 4,225 Germany / Essen	Yeah, taking a separate file looks like the most reasonable approach for me as well, if you need the bitmap for a panel. Always learn from history, to be sure you make the same mistakes again...

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