Alpha blending...
Well im using full screen exlusive mode and active rendering, with page flipping and buffer strategy.
Now... on top of the actual game, i want to draw a "console" thing.
I want this to use alpha blending... so the background behind the console is shaded (but still visible).
Now how do i procceed to do this?
Create the console as an image, but then in the rendering... how do i draw that image upon the graphics that i get from the bufferstrategy etc?
[483 byte] By [
Hephos] at [2007-9-27 22:02:43]
Hey, just use colors with low alpha levels when filling the console.
g.setColor(new Color(0,0,0,100)); // Transparent black
So if you draw the game first, then the console with tranparent colors, you'll see through to the game.
Alpha blending is used when you need to blend a sprite image with the background.
Heres some code that does alpha blending with image pixels.
public static Image alphaBlendPixels(int [] imageData,int width,int height,int alpha,Component comp)
{
for(int i=0; i<width; i++)
{
for(int j=0; j><height; j++)
{
int pixel = imageData[i +( j * width)];
int red = (pixel >> 16) & 0xff;
int green = (pixel >> 8) & 0xff;
int blue = (pixel ) & 0xff;
imageData[i +( j * width)] =(alpha <<24) | (red << 16) | (green << 8) | blue;
}
}
return comp.createImage(new MemoryImageSource(width,height,imageData,0,width));
}
Hope that helps!
Harley.
