Fix #824/SNOW-466: Window Creation Error related to FSAA

- Linux only: Retry window creation with lower FSAA samples if it
fails.
- All platforms: save actual FSAA level into RenderFSAASamples after
window is created.

This exapnds on the patch from SNOW-466 by Robin Cornelius.

1 files changed, 9 insertions, 0 deletions

diff --git a/linden/indra/llwindow/llwindowsdl.cpp b/linden/indra/llwindow/llwindowsdl.cpp
index edfe33b..2f9de6b 100644
--- a/linden/indra/llwindow/llwindowsdl.cpp
+++ b/linden/indra/llwindow/llwindowsdl.cpp
@@ -632,6 +632,15 @@ BOOL LLWindowSDL::createContext(int x, int y, int width, int height, int bits, B
                         mWindow = SDL_SetVideoMode(width, height, bits, sdlflags);
                 }
 
+                while (!mWindow && mFSAASamples > 0)
+                {
+                        llwarns << "Window creating failed with " << mFSAASamples << "x FSAA."<<llendl;
+                        mFSAASamples = mFSAASamples>>1;
+                        SDL_GL_SetAttribute(SDL_GL_MULTISAMPLEBUFFERS, mFSAASamples ? 1 : 0);
+                        SDL_GL_SetAttribute(SDL_GL_MULTISAMPLESAMPLES, mFSAASamples);
+                        mWindow = SDL_SetVideoMode(width, height, bits, sdlflags);
+                }
+
                 if (!mWindow)
                 {
                         llwarns << "createContext: window creation failure. SDL: " << SDL_GetError() << llendl;