Scenegraph rewrite

[NaN]

I did a quick test(2695) and hit a segfault on game restart.

The stack trace:

Code:

#0 004CA82D    RENDER_INPUT_SCENE::SelectTexturing(this=0x28afa8, forme=..., glstate=...) (E:\vdrift\vdrift\src\graphics_renderers.cpp:504)
#1 004C9CB6    RENDER_INPUT_SCENE::DrawList(this=0x28afa8, glstate=..., drawlist=..., preculled=true) (E:\vdrift\vdrift\src\graphics_renderers.cpp:236)
#2 004C9BDC    RENDER_INPUT_SCENE::Render(this=0x28afa8, glstate=...) (E:\vdrift\vdrift\src\graphics_renderers.cpp:211)
#3 004C8870    GRAPHICS_SDLGL::Render(this=0x28aba4, input=0x28afa8, output=..., error_output=...) (E:\vdrift\vdrift\src\graphics.cpp:968)
#4 004C7B03    GRAPHICS_SDLGL::RenderDrawlists(this=0x28aba4, dynamic_drawlist=..., static_drawlist=..., render_scene=..., render_output=..., error_output=...) (E:\vdrift\vdrift\src\graphics.cpp:887)
#5 004C5B34    GRAPHICS_SDLGL::DrawScene(this=0x28aba4, error_output=...) (E:\vdrift\vdrift\src\graphics.cpp:603)
#6 004BFDCB    GAME::LoadingScreen(this=0x28a770, progress=0, max=1) (E:\vdrift\vdrift\src\game.cpp:2116)
#7 004BBF84    GAME::LoadTrack(this=0x28a770, trackname=...) (E:\vdrift\vdrift\src\game.cpp:1760)
#8 004BA2CB    GAME::NewGame(this=0x28a770, playreplay=false, addopponents=false, num_laps=0) (E:\vdrift\vdrift\src\game.cpp:1512)
#9 004B86A0    GAME::ProcessGUIAction(this=0x28a770, action=...) (E:\vdrift\vdrift\src\game.cpp:1306)
#10 004B4C52    GAME::ProcessGUIInputs(this=0x28a770) (E:\vdrift\vdrift\src\game.cpp:1023)
#11 004B246B    GAME::AdvanceGameLogic(this=0x28a770) (E:\vdrift\vdrift\src\game.cpp:622)
#12 004B236D    GAME::Tick(this=0x28a770, deltat=0.00700000022) (E:\vdrift\vdrift\src\game.cpp:606)
#13 004B221D    GAME::MainLoop(this=0x28a770) (E:\vdrift\vdrift\src\game.cpp:572)
#14 004AE2F9    GAME::Start(this=0x28a770, args=...) (E:\vdrift\vdrift\src\game.cpp:175)
#15 004F716F    SDL_main(argc=2, argv=0x28fd40) (E:\vdrift\vdrift\src\main.cpp:70)
#16 0052C716    console_main(argc=2, argv=0x28fd40) (src/main/win32/SDL_win32_main.c:217)
#17 0052C8D7    WinMain(hInst=0x400000, hPrev=0x0, szCmdLine=0x22830dc "-debug", sw=10) (src/main/win32/SDL_win32_main.c:353)
#18 00000000    0x0052c180 in main() (??:??)