[SDL] Question about blitting...
leo28c at gmail.com
Sat Aug 12 14:55:03 PDT 2006
Dang... How can I make it transparent then? Thanks!
David Olofson wrote:
> On Saturday 12 August 2006 03:55, L-28C wrote:
>> Hello everyone!
>> OK... I have a car, and I want to put windows on it. How do I make
>> windows so that they are transparent, like, so I can see the driver?
>> have the window on a PNG file, and I set up the transparency in
>> Photoshop, but it just shows up solid on SDL... How do I blit it
>> correctly? I have the following code:
>> // Create window surface
>> SDL_Surface *glass = SDL_CreateRGBSurface(SDL_HWSURFACE, 96, 96, 32,
>> 0, 0, 0);
>> // Blit the window from the PNG to the 'glass' surface
>> SDL_BlitSurface(this->vehicles.layers, &src, glass, &dest);
>> // Set 100 transparency
>> SDL_SetAlpha(glass, SDL_SRCALPHA, 100);
>> // Blit it to the car
>> SDL_BlitSurface(glass, &src, this->vehicles.bmp, &dest);
> This will only *blend* the window onto the car. It will not affect the
> alpha channel of the car, and thus, it cannot make the window on the
> car transparent.
> //David Olofson - Programmer, Composer, Open Source Advocate
> .------- http://olofson.net - Games, SDL examples -------.
> | http://zeespace.net - 2.5D rendering engine |
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> '-- http://www.reologica.se - Rheology instrumentation --'
~ Leo, M@$73r L3170, Sulfurik, Kixdemp, L-28C... Whatever you wanna call me.
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