i965: Instead of fallback on missing region, just bind a null renderbuffer.

The change for GPU hanging in 13bab58f04c1ec6d0d52760eab490a0997d9abe2
fell back even when rb == NULL, which is wrong for GLES2 and caused
segfaulting in GLES2 conformance.  For the GPU hang case (where the
broken 2D driver failed to allocate a BO for the window system
renderbuffer), it also would assertion fail/segfault immediately after
the fallback setup when the renderbuffer map failed.

Fixes GLES2 conformance packed_depth_stencil.

Signed-off-by: Eric Anholt <eric@anholt.net>
Signed-off-by: Kenneth Graunke <kenneth@whitecape.org>

diff --git a/src/mesa/drivers/dri/i965/brw_wm_surface_state.c b/src/mesa/drivers/dri/i965/brw_wm_surface_state.c
index d34059f..cef0c65 100644 (file)
--- a/src/mesa/drivers/dri/i965/brw_wm_surface_state.c
+++ b/src/mesa/drivers/dri/i965/brw_wm_surface_state.c
@@ -562,12 +562,8 @@ prepare_wm_surfaces(struct brw_context *brw)
         struct intel_renderbuffer *irb = intel_renderbuffer(rb);
         struct intel_region *region = irb ? irb->region : NULL;
 
-        if (region == NULL || region->buffer == NULL) {
-           brw->intel.Fallback = GL_TRUE; /* boolean, not bitfield */
-           return;
-        }
-
-        brw_add_validated_bo(brw, region->buffer);
+        if (region)
+           brw_add_validated_bo(brw, region->buffer);
         nr_surfaces = SURF_INDEX_DRAW(i) + 1;
       }
    }

diff --git a/src/mesa/drivers/dri/i965/gen7_wm_surface_state.c b/src/mesa/drivers/dri/i965/gen7_wm_surface_state.c
index ff22025..361db2f 100644 (file)
--- a/src/mesa/drivers/dri/i965/gen7_wm_surface_state.c
+++ b/src/mesa/drivers/dri/i965/gen7_wm_surface_state.c
@@ -329,12 +329,8 @@ prepare_wm_surfaces(struct brw_context *brw)
         struct intel_renderbuffer *irb = intel_renderbuffer(rb);
         struct intel_region *region = irb ? irb->region : NULL;
 
-        if (region == NULL || region->buffer == NULL) {
-           brw->intel.Fallback = GL_TRUE; /* boolean, not bitfield */
-           return;
-        }
-
-        brw_add_validated_bo(brw, region->buffer);
+        if (region)
+           brw_add_validated_bo(brw, region->buffer);
         nr_surfaces = SURF_INDEX_DRAW(i) + 1;
       }
    }