> The main reason to render textures at this stage is that textures with > transparency do change the fragments that are rendered. Calculating > the fog color seems wrong, but I don't have the sources in front of me > and gitorious is acting up.
So since we're not using transparent textures for terrain, it should actually be okay to drop the texturing as well? > one texture2D() call -> 12% framerate drop seems a bit excessive. What > is the time difference in milliseconds? Hardware? The GPU is an nVIDIA GeForce 8600M. I usually do benchmark testing spawning with the ufo at given location and altitude and set visibility to a standard value. That produces very consistent results and reproducable framerates for me, so I can gauge the impact of a change. In this instance, I compared the simple haze scheme (with only the terrain texture) with the detailed scheme to which I successively added snow texture, detail overlay texture and mix texture. Since that slowed the code quite a bit, I started commenting things out while benchmarking, and most of the time is burnt by just looking up a texture even if I don't do anything with it. I don't have any precise timings for just the texture2D() call. Also, I should remark that for this test the framerate is completely determined by how fast the fragment shader executes, i.e. I have tested for relatively low vertex count and no clouds. The framerates (ufo in 1200x900 window) ranged between 49 and 31 fps, in real-case tests with the F-16 in 1920x1200 fullscreen mode between 20 and 11 fps. When I leave the texturing out in the first pass, at startup I get 22 fps instead of 20. * Thorsten ------------------------------------------------------------------------------ Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ _______________________________________________ Flightgear-devel mailing list Flightgear-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/flightgear-devel
