wgl: Fix depth/stencil image support when using zink kopper

Kopper requires that any depth/stencil images are created through winsys which
was not taken into account by the WGL frontend causing it to hit an assert:
'Assertion failed: ctx->fb_state.zsbuf->texture->bind & PIPE_BIND_DISPLAY_TARGET'

fixes #9256
cc: mesa-stable

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/24055>

src/gallium/frontends/wgl/stw_pixelformat.c

@@ -204,7 +204,8 @@ stw_pixelformat_add(struct stw_device *stw_dev,
 
    /*
     * since gallium frontend can allocate depth/stencil/accum buffers, we provide
-    * only color buffers here
+    * only color buffers here in the non-zink case, however in the zink case
+    * kopper requires that we allocate depth/stencil through the winsys
     */
    pfi->stvis.buffer_mask = ST_ATTACHMENT_FRONT_LEFT_MASK;
    if (doublebuffer)
@@ -213,6 +214,11 @@ stw_pixelformat_add(struct stw_device *stw_dev,
    pfi->stvis.color_format = color->format;
    pfi->stvis.depth_stencil_format = depth->format;
 
+#ifdef GALLIUM_ZINK
+   if (stw_dev->zink && (depth->bits.depth > 0 || depth->bits.stencil > 0))
+      pfi->stvis.buffer_mask |= ST_ATTACHMENT_DEPTH_STENCIL_MASK;
+#endif
+
    pfi->stvis.accum_format = (accum) ?
       PIPE_FORMAT_R16G16B16A16_SNORM : PIPE_FORMAT_NONE;
 

src/gallium/frontends/wgl/stw_st.c

@@ -227,6 +227,12 @@ stw_st_framebuffer_validate_locked(struct st_context *st,
       case ST_ATTACHMENT_DEPTH_STENCIL:
          format = stwfb->stvis.depth_stencil_format;
          bind = PIPE_BIND_DEPTH_STENCIL;
+
+#ifdef GALLIUM_ZINK
+         if (stw_dev->zink)
+            bind |= PIPE_BIND_DISPLAY_TARGET;
+#endif
+
          break;
       default:
          format = PIPE_FORMAT_NONE;