opengl32: Support PFD_DEPTH_DONTCARE flag in wglChoosePixelFormat().

dlls/opengl32/tests/opengl.c

@@ -330,6 +330,18 @@ static void test_choosepixelformat(void)
     ok( test_pfd(&pfd, NULL), "PFD_STEREO_DONTCARE failed\n" );
     pfd.dwFlags &= ~PFD_STEREO_DONTCARE;
     pfd.cAuxBuffers = 0;
+
+    pfd.dwFlags |= PFD_DEPTH_DONTCARE;
+    pfd.cDepthBits = 24;
+    ok( test_pfd(&pfd, &ret_fmt), "PFD_DEPTH_DONTCARE failed.\n" );
+    ok( !ret_fmt.cDepthBits, "Got unexpected cDepthBits %u.\n", ret_fmt.cDepthBits );
+    pfd.cStencilBits = 8;
+    ok( test_pfd(&pfd, &ret_fmt), "PFD_DEPTH_DONTCARE, depth 24, stencil 8 failed.\n" );
+    ok( !ret_fmt.cDepthBits || ret_fmt.cDepthBits == 24, "Got unexpected cDepthBits %u.\n", ret_fmt.cDepthBits );
+    ok( ret_fmt.cStencilBits == 8, "Got unexpected cStencilBits %u.\n", ret_fmt.cStencilBits );
+    pfd.cDepthBits = 0;
+    pfd.cStencilBits = 0;
+    pfd.dwFlags &= ~PFD_DEPTH_DONTCARE;
 }
 
 static void WINAPI gl_debug_message_callback(GLenum source, GLenum type, GLuint id, GLenum severity,

dlls/opengl32/wgl.c

@@ -563,7 +563,7 @@ INT WINAPI wglChoosePixelFormat(HDC hdc, const PIXELFORMATDESCRIPTOR* ppfd)
                 continue;
             }
         }
-        if (ppfd->cDepthBits)
+        if (ppfd->cDepthBits && !(ppfd->dwFlags & PFD_DEPTH_DONTCARE))
         {
             if (((ppfd->cDepthBits > best.cDepthBits) && (format.cDepthBits > best.cDepthBits)) ||
                 ((format.cDepthBits >= ppfd->cDepthBits) && (format.cDepthBits < best.cDepthBits)))
@@ -599,6 +599,9 @@ INT WINAPI wglChoosePixelFormat(HDC hdc, const PIXELFORMATDESCRIPTOR* ppfd)
                 continue;
             }
         }
+        if (ppfd->dwFlags & PFD_DEPTH_DONTCARE && format.cDepthBits < best.cDepthBits)
+            goto found;
+
         continue;
 
     found: