texture_border_clamp

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This extension defines an additional texture clamping algorithm that clamps texture coordinates at all mipmap levels such that nearest and linear filters return the color of the border texels.

• Under OpenGL 1.0 clamping, the bilinear texture sample straddles the border, taking half its color from the border and half from the texture image.
  
  
• It is sometimes desirable for a texture to be clamped to its border color. This enables billboard textures to be manipulated easily by setting the texture border alpha to 0 and using decal texturing.