[PATCH xserver] dri3: Clamp to 1.0 if not all screens support 1.2

[Adam Jackson]

Signed-off-by: Adam Jackson <ajax at redhat.com>
---
 dri3/dri3_request.c | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/dri3/dri3_request.c b/dri3/dri3_request.c
index 452b08a876..8b35036110 100644
--- a/dri3/dri3_request.c
+++ b/dri3/dri3_request.c
@@ -32,6 +32,17 @@
 #include <protocol-versions.h>
 #include <drm_fourcc.h>
 
+static Bool
+dri3_screen_can_one_point_two(ScreenPtr screen)
+{
+    dri3_screen_priv_ptr dri3 = dri3_screen_priv(screen);
+
+    if (dri3 && dri3->info && dri3->info->version >= 2)
+        return TRUE;
+
+    return FALSE;
+}
+
 static int
 proc_dri3_query_version(ClientPtr client)
 {
@@ -45,6 +56,21 @@ proc_dri3_query_version(ClientPtr client)
     };
 
     REQUEST_SIZE_MATCH(xDRI3QueryVersionReq);
+
+    for (int i = 0; i < screenInfo.numScreens; i++) {
+        if (!dri3_screen_can_one_point_two(screenInfo.screens[i])) {
+            rep.minorVersion = 0;
+            break;
+        }
+    }
+
+    for (int i = 0; i < screenInfo.numGPUScreens; i++) {
+        if (!dri3_screen_can_one_point_two(screenInfo.gpuscreens[i])) {
+            rep.minorVersion = 0;
+            break;
+        }
+    }
+
     /* From DRI3 proto:
      *
      * The client sends the highest supported version to the server
-- 
2.17.0