-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Pekka Paalanen schrieb: > On Mon, 08 Dec 2008 14:48:33 +0100 > Philipp Klaus Krause <[EMAIL PROTECTED]> wrote: > >> - From time to time people say that they want support for precompiled >> shaders in the OpenGL API. The main point for this they bring forth is >> reducing loading times for their applications. >> >> I think this advantage of precompiled shaders can be had without support >> for it in the API: It can be inmplemented transparently in the driver. > > Is it just a theoretical gain, or do the people actually have public > benchmark results showing that the net gain with cold/hot disk cache is > is noticeable? A quick spin in Google gave me nothing, but I would not > be surprised if I just missed the right keywords. > > Or is compiling shaders with Mesa so hideously slow that it would be a > clear benefit even without benchmarking?
People are complaining about slow compilation of programs everywhere. Just look at the opengl.org forums. As Keith Whitwell mentioned the compilation result sometimes depends on some OpenGL state. That means changing state can trigger recompilation (for Nvidia drivers sometimes even changing uniforms to/from magic values like 0 and 1). People change state while rendering frames. I've seen posts by people that said profiling revealed their programs spend more time compiling shaders than doing anything else. > I can also come up with another reason to have precompiled shaders: > "protecting" the shader source code. I am not sure that makes any sense, > though. Well, some people want precompiled shaders for code obfuscation. However that would need API exposure. AFAIK they want to ship only a binary with their programs. They'd like to compile their shaders into some intermediate byte code (which is obfuscated), then pass that byte code to the driver. I do not consider this an important feature for Mesa. Philipp -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.9 (GNU/Linux) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iEYEARECAAYFAkk+zRsACgkQbtUV+xsoLpq/1ACgt3eST+p1pt58dZ8DjEV6ChqX ZRAAoKs4DswI6nfzh2VMBq5R++Nft0nT =ymmV -----END PGP SIGNATURE----- ------------------------------------------------------------------------------ SF.Net email is Sponsored by MIX09, March 18-20, 2009 in Las Vegas, Nevada. The future of the web can't happen without you. Join us at MIX09 to help pave the way to the Next Web now. Learn more and register at http://ad.doubleclick.net/clk;208669438;13503038;i?http://2009.visitmix.com/ _______________________________________________ Mesa3d-dev mailing list Mesa3d-dev@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/mesa3d-dev
