On Wednesday, 26 September 2007 at 8:45, Per Inge Mathisen wrote: > On 9/26/07, Christian Ohm <[EMAIL PROTECTED]> wrote: > > So what's the reason for not using GL_CLAMP_TO_EDGE? > We do...
Oh, right, trunk does for the terrain textures. I thought I had updated my copy before grepping... Any reason why it isn't used everywhere instead of GL_CLAMP? Not that it'd help much, since with texture pages most texture edges aren't on the edge of the image. > > As far as I can see the trunk doesn't use blending on the terrain, but > > why have several people said they still have texture seams using it? > > I think this is because their OpenGL drivers are overriding blending > parameters, or they are looking at tiles that simply do not tile well > in any version. (The "mud" tiles in tertilesc1 simply do not tile > well, for example.) Ah, driver settings overriding the application. Always great. > > And how does Warzone handle the tiles internally? > > The textures are stitched together into texture atlas pages for faster > access (less rebinding). So, if the texture pages are generated on runtime, what about adding a one pixel border to every tile (just replicate the outermost pixel row)? That'd need a bit more texture memory (since you can fit one row and column of tiles less into the texture), and a bit more complicated calculation of texture coordinates, but that way the border pixels stay the same colour even when blending. (I think kage suggested something similar in his forum post.) > > the black borders should only appear on those tiles > > at the border of the image (which might be the reason they are not more > > apparent). > > No, that has little to do with it. Seams appear whenever the outermost > pixels of a tile do not match the pixels in the neighbouring tile, and > that happens whenever filtering on the outermost pixels is done, since > it cannot know how to change these pixels without making them no > longer match the pixels they should tile against. That was more or less what I meant - not every texture has a black border, since some are next to another texture that doesn't contrast much to it. If every tile was a separate texture, every tile had a black border (with GL_CLAMP, and GL_CLAMP_TO_EDGE would solve the problem). _______________________________________________ Warzone-dev mailing list Warzone-dev@gna.org https://mail.gna.org/listinfo/warzone-dev
