Nice looking lines [OpenGL]

[User137]

mag and min filters set to GL_LINEAR

... after glBindTexture on the specific texture?

[arthurprs]

mag and min filters set to GL_LINEAR

... after glBindTexture on the specific texture?

yes

i have tried rendering with trianglestrip, same result =\

[Andreaz]

Try this version, use the same texture as you posted before, it renders 3 quads, uses some vector math to avoid messing with rotations.

Procedure DrawLine(const PStart: TVector2f; const PEnd: TVector2f; Width: Single);
var Vector   : TVector2f;
var Normal   : TVector2f;
var NXW: Single;
var NYW: Single;
var VXW: Single;
var VYW: Single;
begin
  Vector.X:= PEnd.X - PStart.X;
  Vector.Y:= PEnd.Y - PStart.Y;
  
  Vector:= Normalize(Vector);

  // Calculate the normal to the vector
  Normal.X:= -Vector.Y;
  Normal.Y:=  Vector.X;

  // Precompute the factors
  NXW:= Normal.X * Width;
  NYW:= Normal.Y * Width;

  VXW:= Vector.X * Width;
  VYW:= Vector.Y * Width;

  glEnable(GL_TEXTURE_2D);

  glBegin(GL_QUADS);
    // First quad
    glTexCoord2f(0.0, 0.5); glVertex2f(PStart.X - NXW + VYW, PStart.Y - NYW + VYW);
    glTexCoord2f(1.0, 0.5); glVertex2f(PStart.X + NXW + VYW, PStart.Y + NYW + VYW);
    glTexCoord2f(1.0, 0.5); glVertex2f(PEnd.X   + NXW - VYW, PEnd.Y   + NYW - VYW);
    glTexCoord2f(0.0, 0.5); glVertex2f(PEnd.X   - NXW - VYW, PEnd.Y   - NYW - VYW);

    // Middle quad
    glTexCoord2f(0.0, 0.0); glVertex2f(PStart.X - NXW      , PStart.Y - NYW);
    glTexCoord2f(1.0, 0.0); glVertex2f(PStart.X + NXW      , PStart.Y + NYW);
    glTexCoord2f(1.0, 0.5); glVertex2f(PStart.X + NXW + VXW, PStart.Y + NYW + VYW);
    glTexCoord2f(0.0, 0.5); glVertex2f(PStart.X - NXW + VXW, PStart.Y - NYW + VYW);

    // End quad
    glTexCoord2f(0.0, 0.0); glVertex2f(PEnd.X - NXW      , PEnd.Y - NYW);
    glTexCoord2f(1.0, 0.0); glVertex2f(PEnd.X + NXW      , PEnd.Y + NYW);
    glTexCoord2f(1.0, 0.5); glVertex2f(PEnd.X + NXW - VXW, PEnd.Y + NYW - VYW);
    glTexCoord2f(0.0, 0.5); glVertex2f(PEnd.X - NXW - VXW, PEnd.Y - NYW - VYW);
  glEnd();
end;

[arthurprs]

the result andreaz

[User137]

and how it looks when i draw stretched

I don't understand, i can clearly see you have LINEAR working in that screenshot, yet it stopped working?

[arthurprs]

EDIT: forget about the errors, the code is working perfectly, the #@!@# here forgot that he changed the texture...

[Andreaz]

the result andreaz
...snip...

It should really look like this,


Well here's the complete source
http://phoenixlib.net/files/Nice_looking_lines.zip

[arthurprs]

Thanks Andreaz, the code works good

changing topic,

I was looking on phoenixlib sources and i noticed that you use display lists and vertexarray on particles, those method are really faster?

[Andreaz]

Yeah, vertex arrays is alot faster then intermediate mode (glBegin, glVertex, glEnd).

And displaylists can be faster then vertex arrays, atleast for static geometry. However displaylists is a tricky subject, they might be implemented in the driver and not in the gpu.

In the new version of Phoenix i'm going away from displaylists and using vertex arrays and vertex buffer objects instead.