Allow deleted resources to be used

gpu/command_buffer/service/vertex_attrib_manager_unittest.cc

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "gpu/command_buffer/service/vertex_attrib_manager.h"
 
 #include "base/memory/scoped_ptr.h"
 #include "gpu/command_buffer/common/gl_mock.h"
 #include "gpu/command_buffer/service/feature_info.h"
 #include "gpu/command_buffer/service/test_helper.h"
@@ skipping 156 matching lines @@
   EXPECT_FALSE(info->CanAccess(1));
   manager_.SetAttribInfo(1, buffer, 4, GL_FLOAT, GL_FALSE, 0, 16, 0);
   EXPECT_TRUE(info->CanAccess(1));
   manager_.SetAttribInfo(1, buffer, 4, GL_FLOAT, GL_FALSE, 0, 20, 0);
   EXPECT_TRUE(info->CanAccess(0));
   EXPECT_FALSE(info->CanAccess(1));
 
   buffer_manager.Destroy(false);
 }
 
+TEST_F(VertexAttribManagerTest, Unbind) {
+  BufferManager buffer_manager;
+  buffer_manager.CreateBufferInfo(1, 2);
+  buffer_manager.CreateBufferInfo(3, 4);
+  BufferManager::BufferInfo* buffer1 = buffer_manager.GetBufferInfo(1);
+  BufferManager::BufferInfo* buffer2 = buffer_manager.GetBufferInfo(3);
+  ASSERT_TRUE(buffer1 != NULL);
+  ASSERT_TRUE(buffer2 != NULL);
+
+  VertexAttribManager::VertexAttribInfo* info1 =
+      manager_.GetVertexAttribInfo(1);
+  VertexAttribManager::VertexAttribInfo* info3 =
+      manager_.GetVertexAttribInfo(3);
+
+  // Attach to 2 buffers.
+  manager_.SetAttribInfo(1, buffer1, 3, GL_SHORT, GL_TRUE, 32, 32, 4);
+  manager_.SetAttribInfo(3, buffer1, 3, GL_SHORT, GL_TRUE, 32, 32, 4);
+  // Check they were attached.
+  EXPECT_EQ(buffer1, info1->buffer());
+  EXPECT_EQ(buffer1, info3->buffer());
+  // Unbind unattached buffer.
+  manager_.Unbind(buffer2);
+  // Should be no-op.
+  EXPECT_EQ(buffer1, info1->buffer());
+  EXPECT_EQ(buffer1, info3->buffer());
+  // Unbind buffer.
+  manager_.Unbind(buffer1);
+  // Check they were detached
+  EXPECT_TRUE(NULL == info1->buffer());
+  EXPECT_TRUE(NULL == info3->buffer());
+
+  buffer_manager.Destroy(false);
+}
+
 }  // namespace gles2
 }  // namespace gpu