I need some help with 2D drawing libraries

[jonharkulsykkel]

but both are megablurry :0
thx for replyeis btw

[User137]

glTranslatef(0.375, 0.375, 0.0);

That is the most important line of code for 2D opengl. disable mipmapping/filtering on textures. All coordinates as integers.

pixel perfect 2D. perfect for fonts and sprites

That shouldn't be the case... There was time when different graphics cards drew with a little different coordinates but i think modern cards know better to do it from 0,0.

If you draw a quad that fills the screen the coordinates are:
0,0-Width,Height
Do you see why it's not Width-1, Height-1? The same reason that if you want to draw a quad that fills 1 pixel only.
To show a pixel at 5,5 use quad coordinates 5,5 - 6,6. (Or use GL_POINTS at 5.5, 5.5)

But if you want to draw a GL_LINE on right edge:
(width-0.5, 0.5) - (width-0.5, height-0.5)
Because center of pixel is 0.5, 0.5.
A sprite for example wants to utilize the whole pixel so it starts from 0,0.

[phibermon]

I got it from the OpenGL red-book... And I quote :

"An optimum compromise that allows all primitives to be specified at integer positions, while still ensuring predictable rasterization, is to translate x and y by 0.375, as shown in the following code fragment. Such a translation keeps polygon and pixel image edges safely away from the centers of pixels, while moving line vertices close enough to the pixel centers."

But if you want to add 0.5, on the CPU, to both components of every coordinate you send, to the GPU, be my guest

I'm no longer using immediate mode, will post if I find any problems getting unfiltered, pixel aligned fonts working under GL3 Core. (I may go down the vector font route if I can't figure out an elegant way to render bitmap fonts using shaders)

[jonharkulsykkel]

but waht is this JUI thing? ;0

[Ñuño Martínez]

ok so i making a game in delphi and every frame it needs to render about 1200 16x16 images, then 1200 alpha blended pics then a dude.

I think the problem isn't the library. You have 2401 blitting each frame, that's "too much". I'm sure you can do the same drawing less pictures.

[WILL]

Maybe if you tell us what all these images are for we may be able to help a bit better I think. I'm guessing it's a tiled engine? That may account for the "1200 16x16 images" in which case I must ask what your game's screen resolution with 16x16 sized sprites. So what are the 1200 alpha blended images?

It almost seems like you are trying to swallow a whale without knowing how to... well... "fish" *ahem* pardon the expression. So lets start with what type of game it is and what gameplay features are you trying to put into it?

[chronozphere]

I'd go down the OpenGL path if I were you.

So, can you provide use with a screenshot of your app. We would like to see what you are trying to do and how blurry the output actually is.

[dazappa]

What function specifically are you using in andorra? (do you mean additive blending?)

for i := 0 to 2400 do
begin
   gui[1].DrawAdd(AdDraw,AdRect(0,0,16,16),1,250);
end;

I can do the above with an average of 300 FPS. I think it may be your computer or drivers, unless you consider 300 fps too slow...

[jonharkulsykkel]

heres the code i tested with andorra

    //cam stuff
    cx := camx div 16;
    cy := camy div 16;
    cxl := cx+blockw;
    cyl := cy+blockh;

    //update grass
    updGrass := updGrass+1;
    if updGrass > 60*2 then begin
      updGrass := 0;
      updateGrass(false);
    end;

    //draw blocks
    for y := cy to cyl do begin
      for x := cx to cxl do begin
        if not(blocks[x,y,0] = 0) then begin
          images.Items[1].Draw(dxdraw, (x*16)-camx, (y*16)-camy, blocks[x,y,0]-1);

          blockRect.Left := (x*16)-camx;
          blockRect.Top := (y*16)-camy;
          blockRect.Right := blockRect.Left+16;
          blockRect.Bottom := blockRect.Top+16;
          images.Items[5].DrawAlpha(dxdraw, blockRect, 0, blocks[x,y,1]);
        end;
      end;
    end;

its a tile based game yes, and it draws first all the tiles, then bllack boxes with various alpha levels to create shadows
i got a solution to some of my problems, i kinda cached all the blocks in an array with 15 diffrent light values instead of drawing alpha blended images over them. but i still need to alpha blend the sky, becus the dude will be walking there and i want him to be dark and also there will be water so i definatly need it
and here screenshot of my game (this is done in delphix)