Game: Fixed missing check for the availability of stencil buffer

This fixes experimental dynamic light effects ('light_enabled 1' and 'light_player_halo') which were broken by 0e101bd452c40da601236aaa2dd4106be47ddce1.
It's worth noting that they even work on my laptop's integrated video if I just set 'gwin_has_stencil' to True, even though the driver says it doesn't support stencils.
The discrete GPU on the same laptop reports it correctly.

diff --git a/src/game/sdl/g_system.pas b/src/game/sdl/g_system.pas
index 0fcad1aec0afa596a05959c9388e5de33f7ff502..cc8704c9713e76700e0da37c4cdc14c45f9d3d2f 100644 (file)
--- a/src/game/sdl/g_system.pas
+++ b/src/game/sdl/g_system.pas
@@ -78,12 +78,22 @@ implementation
   (* --------- Graphics --------- *)
 
   function LoadGL: Boolean;
+  {$IFNDEF NOGL_INIT}
+  var
+    ltmp: Integer;
+  {$ENDIF}
   begin
     result := true;
     {$IFDEF NOGL_INIT}
     nogl_Init;
     if glRenderToFBO and (not nogl_ExtensionSupported('GL_OES_framebuffer_object')) then
     {$ELSE}
+    if SDL_GL_GetAttribute(SDL_GL_STENCIL_SIZE, @ltmp) = 0 then
+    begin
+      e_LogWritefln('stencil buffer size: %s', [ltmp]);
+      gwin_has_stencil := (ltmp > 0);
+    end;
+
     if glRenderToFBO and (not Load_GL_ARB_framebuffer_object) then
     {$ENDIF}
     begin

diff --git a/src/game/sdl2/g_system.pas b/src/game/sdl2/g_system.pas
index 9cd1ee194b0ae4b89bb587e593c689067fd477cb..b3005d56b637b464dfa8341f756ef63c12ba21f7 100644 (file)
--- a/src/game/sdl2/g_system.pas
+++ b/src/game/sdl2/g_system.pas
@@ -75,12 +75,22 @@ implementation
   (* --------- Graphics --------- *)
 
   function LoadGL: Boolean;
+  {$IFNDEF NOGL_INIT}
+  var
+    ltmp: Integer;
+  {$ENDIF}
   begin
     result := true;
     {$IFDEF NOGL_INIT}
     nogl_Init;
     if glRenderToFBO and (not nogl_ExtensionSupported('GL_OES_framebuffer_object')) then
     {$ELSE}
+    if SDL_GL_GetAttribute(SDL_GL_STENCIL_SIZE, @ltmp) = 0 then
+    begin
+      e_LogWritefln('stencil buffer size: %s', [ltmp]);
+      gwin_has_stencil := (ltmp > 0);
+    end;
+
     if glRenderToFBO and (not Load_GL_ARB_framebuffer_object) then
     {$ENDIF}
     begin