add apple_multithreadedgl cvar (offloads OpenGL driver to a second thread if possible...

git-svn-id: svn://svn.icculus.org/twilight/trunk/darkplaces@6971 d7cf8633-e32d-0410-b094-e92efae38249

diff --git a/vid_agl.c b/vid_agl.c
index 191e7e569eac037270d5ec397d70b1b1c0ced0b2..a6e00a62b80880131bb0f7c5c9c7978aca34b772 100644 (file)
--- a/vid_agl.c
+++ b/vid_agl.c
@@ -46,6 +46,7 @@ GLboolean (*qaglSetFullScreen) (AGLContext ctx, GLsizei width, GLsizei height, G
 GLboolean (*qaglSetInteger) (AGLContext ctx, GLenum pname, const GLint *params);
 void (*qaglSwapBuffers) (AGLContext ctx);
 
+static qboolean multithreadedgl;
 static qboolean mouse_avail = true;
 static qboolean vid_usingmouse = false;
 static float mouse_x, mouse_y;
@@ -57,6 +58,8 @@ static qboolean sound_active = true;
 
 static int scr_width, scr_height;
 
+static cvar_t apple_multithreadedgl = {CVAR_SAVE, "apple_multithreadedgl", "0", "makes use of a second thread for the OpenGL driver (if possible) rather than using the engine thread (note: this is done automatically on most other operating systems)"};
+
 static AGLContext context;
 static WindowRef window;
 
@@ -146,6 +149,33 @@ void VID_Finish (qboolean allowmousegrab)
                qaglSwapBuffers(context);
        }
        VID_UpdateGamma(false, GAMMA_TABLE_SIZE);
+
+#ifdef kCGLCEMPEngine
+       if (apple_multithreadedgl.integer)
+       {
+               if (!multithreadedgl)
+               {
+                       CGLError err = 0;
+                       CGLContextObj ctx = CGLGetCurrentContext();
+                       err = CGLEnable(ctx, kCGLEMPEngine);
+                       if (err == kCGLNoError)
+                               multithreadedgl = true;
+                       else
+                               Cvar_SetQuickValue(&apple_multithreadedgl, 0);
+               }
+       }
+       else
+       {
+               if (multithreadedgl)
+               {
+                       multithreadedgl = false;
+                       CGLDisable(ctx, kCGLEMPEngine);
+               }
+       }
+#else
+       if (apple_multithreadedgl.integer)
+               Cvar_SetQuickValue(&apple_multithreadedgl, 0);
+#endif
 }
 
 int VID_SetGamma(unsigned short *ramps, int rampsize)
@@ -228,6 +258,7 @@ void InitSig(void)
 void VID_Init(void)
 {
        InitSig(); // trap evil signals
+       Cvar_RegisterVariable(&apple_multithreadedgl);
 // COMMANDLINEOPTION: Input: -nomouse disables mouse support (see also vid_mouse cvar)
        if (COM_CheckParm ("-nomouse") || COM_CheckParm("-safe"))
                mouse_avail = false;
@@ -553,6 +584,7 @@ int VID_InitMode(int fullscreen, int width, int height, int bpp, int refreshrate
        gl_platform = "AGL";
        gl_videosyncavailable = true;
 
+       multithreadedgl = false;
        vid_isfullscreen = fullscreen;
        vid_usingmouse = false;
        vid_hidden = false;