shitlight experiment

[d2df-sdl.git] / src / game / g_window.pas

diff --git a/src/game/g_window.pas b/src/game/g_window.pas
index 9d27d57e974d056eb6910c4e71abea088d66d9d5..6dfa778096ff33f616b553c00539c81b542227fd 100644 (file)
--- a/src/game/g_window.pas
+++ b/src/game/g_window.pas
@@ -38,6 +38,7 @@ function  g_Window_SetSize(W, H: Word; FScreen: Boolean): Boolean;
 
 var
   gwin_dump_extensions: Boolean = false;
+  gwin_has_stencil: Boolean = false;
 
 implementation
 
@@ -640,6 +641,7 @@ begin
   SDL_GL_SetAttribute(SDL_GL_BLUE_SIZE, 8);
   SDL_GL_SetAttribute(SDL_GL_DEPTH_SIZE, 16);
   SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, 1);
+  SDL_GL_SetAttribute(SDL_GL_STENCIL_SIZE, 1); // lights; it is enough to have 1-bit stencil buffer for lighting
   SDL_GL_SetSwapInterval(v);
 end;
 
@@ -687,6 +689,7 @@ end;
 function SDLMain(): Integer;
 var
   idx: Integer;
+  ltmp: Integer;
 begin
 {$IFDEF HEADLESS}
   e_NoGraphics := True;
@@ -709,6 +712,11 @@ begin
     if ParamStr(idx) = '--opengl-dump-exts' then gwin_dump_extensions := true;
   end;
 
+  SDL_GL_GetAttribute(SDL_GL_STENCIL_SIZE, @ltmp);
+  e_WriteLog(Format('stencil buffer size: %d', [ltmp]), MSG_WARNING);
+
+  gwin_has_stencil := (ltmp > 0);
+
   if not glHasExtension('GL_ARB_texture_non_power_of_two') then
   begin
     e_WriteLog('Driver DID''T advertised NPOT textures support', MSG_WARNING);