Allow running opengl and DirectX applications without stencil support,

dlls/x11drv/opengl.c

@@ -122,6 +122,7 @@ MAKE_FUNCPTR(glXQueryExtension)
 MAKE_FUNCPTR(glXGetFBConfigs)
 MAKE_FUNCPTR(glXChooseFBConfig)
 MAKE_FUNCPTR(glXGetFBConfigAttrib)
+MAKE_FUNCPTR(glXGetVisualFromFBConfig)
 #undef MAKE_FUNCPTR
 
 static BOOL has_opengl(void)
@@ -147,6 +148,7 @@ LOAD_FUNCPTR(glXQueryExtension)
 LOAD_FUNCPTR(glXGetFBConfigs)
 LOAD_FUNCPTR(glXChooseFBConfig)
 LOAD_FUNCPTR(glXGetFBConfigAttrib)
+LOAD_FUNCPTR(glXGetVisualFromFBConfig)
 #undef LOAD_FUNCPTR
 
     wine_tsx11_lock();
@@ -475,25 +477,49 @@ XVisualInfo *X11DRV_setup_opengl_visual( Display *display )
 {
     XVisualInfo *visual = NULL;
     /* In order to support OpenGL or D3D, we require a double-buffered visual and stencil buffer support, */
-    int dblBuf[] = {GLX_RGBA,GLX_DEPTH_SIZE,16,GLX_STENCIL_SIZE,8,GLX_DOUBLEBUFFER,None};
+    int dblBuf[] = {GLX_DRAWABLE_TYPE, GLX_PBUFFER_BIT | GLX_WINDOW_BIT,
+                    GLX_RENDER_TYPE,GLX_RGBA_BIT 
+                    ,GLX_DEPTH_SIZE,16
+                    ,GLX_DOUBLEBUFFER,TRUE, None};
+    int nCfgs;
+    unsigned int i;
+    int maxStencil = -1;
+    int attribSize;
+    GLXFBConfig* cfgs = NULL;
+    GLXFBConfig* chosenCfg = NULL;
     if (!has_opengl()) return NULL;
 
     wine_tsx11_lock();
-    visual = pglXChooseVisual(display, DefaultScreen(display), dblBuf);
-    wine_tsx11_unlock();
-    if (visual == NULL) {
-        /* fallback to a 1 bit stencil (opengl states that at least 1 bit of stencil must be provided for on of the available configurations) */
-        int dblBuf2[] = {GLX_RGBA,GLX_DEPTH_SIZE,16,GLX_STENCIL_SIZE,1,GLX_DOUBLEBUFFER,None};
-        WARN("Failed to get a visual with at least 8 bits of stencil\n");
 
-        wine_tsx11_lock();
-        visual = pglXChooseVisual(display, DefaultScreen(display), dblBuf2);
-        wine_tsx11_unlock();
-        if (visual == NULL) {
-            /* This should only happen if we cannot fidn a match with a depth size 16 */
-            FIXME("Failed to find a suitable visual\n");
+    /* Fint the config with the highest stencil buffer size */
+    cfgs = pglXChooseFBConfig(display, DefaultScreen(display), dblBuf, &nCfgs);
+    if (cfgs == NULL) {
+        WARN("Couldn't find a double buffered, RGBA visual with 16 bits depth\n");
+        visual = NULL;
+    } else {
+        for (i = 0; i < nCfgs ; ++i) {
+            pglXGetFBConfigAttrib(display, cfgs[i],GLX_STENCIL_SIZE, &attribSize);
+            if (attribSize > maxStencil ) {
+                chosenCfg = cfgs + i;
+                maxStencil = attribSize;
+            }
         }
+        pglXGetFBConfigAttrib(display, *chosenCfg, GLX_RED_SIZE, &attribSize);
+        TRACE("A FB config with RED %d", attribSize);
+        pglXGetFBConfigAttrib(display, *chosenCfg, GLX_GREEN_SIZE, &attribSize);
+        TRACE(" GREEN %d",attribSize);
+        pglXGetFBConfigAttrib(display, *chosenCfg, GLX_BLUE_SIZE, &attribSize);
+        TRACE(" BLUE %d",attribSize);
+        pglXGetFBConfigAttrib(display, *chosenCfg, GLX_ALPHA_SIZE, &attribSize);
+        TRACE(" ALPHA %d",attribSize);
+        pglXGetFBConfigAttrib(display, *chosenCfg, GLX_DEPTH_SIZE, &attribSize);
+        TRACE(" DEPTH %d",attribSize);
+        pglXGetFBConfigAttrib(display, *chosenCfg, GLX_STENCIL_SIZE, &attribSize);
+        TRACE(" STENCIL %d has been chosen\n",attribSize);
+        visual = pglXGetVisualFromFBConfig(display, *chosenCfg);
+        XFree(cfgs);
     }
+    wine_tsx11_unlock();
     return visual;
 }