[SOLVED] Bad image when rotating sprites in opengl

[arthurprs]

Im getting really bad graphics in certain angles



i use the code

  glBegin(GL_TRIANGLE_STRIP); //
  glTexCoord2f(xfrac, yfrac);
  glVertex2f(x, y);

  glTexCoord2f(xfrac, hfrac);
  glVertex2f(x, y + titleh);

  glTexCoord2f(wfrac, yfrac);
  glVertex2f(x + titlew, y);

  glTexCoord2f(wfrac, hfrac);
  glVertex2f(x + titlew, y + titleh);
  glEnd;

Whats wrong?


EDIT : You have to apply the texture filters after loading them

[User137]

Are you using linear filtering for texture quality? You can change that with commands:
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, TextureQuality);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, TextureQuality);
where TextureQuality could be GL_LINEAR

[arthurprs]

Thats what i use at the init :?

  // when texture area is small, bilinear filter the closest mipmap
  glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_NEAREST);
  // when texture area is large, bilinear filter the original
  glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);

[arthurprs]

help

[User137]

Hmm.. i'm still not convinced

At the init you say? It needs to be called individually when each texture is loaded somewhere after glBindTexture.

It is easy to spot if linear filter is on when scaling graphics. For the smoothing issue, linear should be responsible for the inner contains of texture but further antialiasing can smoothen the borders.

[arthurprs]

Hmm.. i'm still not convinced

At the init you say? It needs to be called individually when each texture is loaded somewhere after glBindTexture.

It is easy to spot if linear filter is on when scaling graphics. For the smoothing issue, linear should be responsible for the inner contains of texture but further antialiasing can smoothen the borders.

I have to call these texparm after every bindtexture?


edit: it's now solved, i have to call these texparams after loading the texture only, a big thanks

[Robert Kosek]

Yes, basically, in your for-loop, when you load the textures, you need to set the parameters for each. Quite brilliant actually, since if you wanted to you could have different settings per texture.

Edit: Pwned by an edit. :roll:

[arthurprs]

Yes, basically, in your for-loop, when you load the textures, you need to set the parameters for each. Quite brilliant actually, since if you wanted to you could have different settings per texture.

Edit: Pwned by an edit. :roll:

thx for the attention anyway