On 11 March 2017 at 11:51, Federico Dossena <dossenu...@gmail.com> wrote: > In the last week I've been trying to bring an "old" game back to life, Star > Wars Knights of the old republic (KOTOR, for short). It's from 2003 and uses > OpenGL 1.4. > > I have used Mesa, libtxc_dxtn and some trickery to decompress the textures > to boost performance, and right now I have it up and running smoothly with > Gallium on LLVMPipe, compiled on Windows. (I can upload a copy if someone is > interested). This took me about 2 days of compiling and figuring out stuff. > > Here's where the weirdness begins: > Turning on framebuffer effects or soft shadows make the game crash right > after the menu. Using a disassembler and debugger and what little knowledge > I have of reverse engineering, I managed to track down the issue to a > function which uses wglGetProcAddress to get the addresses of several OpenGL > functions. Some of these calls return a null pointer (even if there is a > valid context and it is current), and when the game tries to call them, it > crashes. The first one that makes it crash is a pointer to > wglBindTexImageARB, but there are a few others. NOPing the offending > instructions did not work, and returning a nop function just makes the game > display artifacts. > Strange - afaict mesa (st/wgl) exposes both wglBindTexImageARB and the WGL_ARB_render_texture extension. You can break on DrvGetProcAddress and trace where/how we end up with NULL function pointer.
-Emil _______________________________________________ mesa-dev mailing list mesa-dev@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/mesa-dev
