Don't check for vertex buffers in dispatch aspects

Recently started causing a crash because we stopped creating an empty
InputState for compute pipelines

src/backend/common/CommandBuffer.cpp

@@ -436,8 +436,7 @@ namespace backend {
 
                         constexpr ValidationAspects requiredDispatchAspects =
                             1 << VALIDATION_ASPECT_COMPUTE_PIPELINE |
-                            1 << VALIDATION_ASPECT_BINDGROUPS |
+                            1 << VALIDATION_ASPECT_BINDGROUPS;
-                            1 << VALIDATION_ASPECT_VERTEX_BUFFERS;
 
                         if ((requiredDispatchAspects & ~aspects).any()) {
                             // Compute the lazily computed aspects
@@ -445,11 +444,6 @@ namespace backend {
                                 aspects.set(VALIDATION_ASPECT_BINDGROUPS);
                             }
 
-                            auto requiredInputs = lastPipeline->GetInputState()->GetInputsSetMask();
-                            if ((inputsSet & ~requiredInputs).none()) {
-                                aspects.set(VALIDATION_ASPECT_VERTEX_BUFFERS);
-                            }
-
                             // Check again if anything is missing
                             if ((requiredDispatchAspects & ~aspects).any()) {
                                 HandleError("Some dispatch state is missing");

src/tests/CMakeLists.txt

@@ -26,6 +26,7 @@ add_executable(nxt_unittests
     ${UNITTESTS_DIR}/ToBackendTests.cpp
     ${UNITTESTS_DIR}/WireTests.cpp
     ${VALIDATION_TESTS_DIR}/BufferValidationTests.cpp
+    ${VALIDATION_TESTS_DIR}/ComputeValidationTests.cpp
     ${VALIDATION_TESTS_DIR}/DepthStencilStateValidationTests.cpp
     ${VALIDATION_TESTS_DIR}/ValidationTest.cpp
     ${VALIDATION_TESTS_DIR}/ValidationTest.h

src/tests/unittests/validation/ComputeValidationTests.cpp

@@ -0,0 +1,20 @@
+// Copyright 2017 The NXT Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "ValidationTest.h"
+
+class ComputeValidationTest : public ValidationTest {
+};
+
+//TODO(cwallez@chromium.org): Add a regression test for Disptach validation trying to acces the input state.