gpu/command_buffer/common/command_buffer_shared_test.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 // This file contains the tests for the CommandBufferSharedState class.
   6
   7 #include "gpu/command_buffer/common/command_buffer_shared.h"
   8 #include "base/bind.h"
   9 #include "base/memory/scoped_ptr.h"
  10 #include "base/threading/thread.h"
  11 #include "testing/gtest/include/gtest/gtest.h"
  12
  13 namespace gpu {
  14
  15 class CommandBufferSharedTest : public testing::Test {
  16  protected:
  17
  18   virtual void SetUp() {
  19     shared_state_.reset(new CommandBufferSharedState());
  20     shared_state_->Initialize();
  21   }
  22
  23   scoped_ptr<CommandBufferSharedState> shared_state_;
  24 };
  25
  26 TEST_F(CommandBufferSharedTest, TestBasic) {
  27   CommandBuffer::State state;
  28
  29   shared_state_->Read(&state);
  30
  31   EXPECT_LT(state.generation, 0x80000000);
  32   EXPECT_EQ(state.get_offset, 0);
  33   EXPECT_EQ(state.put_offset, 0);
  34   EXPECT_EQ(state.token, -1);
  35   EXPECT_EQ(state.error, gpu::error::kNoError);
  36   EXPECT_EQ(state.context_lost_reason, gpu::error::kUnknown);
  37 }
  38
  39 static const int kSize = 100000;
  40
  41 void WriteToState(int32 *buffer,
  42                   CommandBufferSharedState* shared_state) {
  43   CommandBuffer::State state;
  44   for (int i = 0; i < kSize; i++) {
  45     state.token = i - 1;
  46     state.get_offset = i + 1;
  47     state.generation = i + 2;
  48     state.error = static_cast<gpu::error::Error>(i + 3);
  49     // Ensure that the producer doesn't update the buffer until after the
  50     // consumer reads from it.
  51     EXPECT_EQ(buffer[i], 0);
  52
  53     shared_state->Write(state);
  54   }
  55 }
  56
  57 TEST_F(CommandBufferSharedTest, TestConsistency) {
  58   scoped_array<int32> buffer;
  59   buffer.reset(new int32[kSize]);
  60   base::Thread consumer("Reader Thread");
  61
  62   memset(buffer.get(), 0, kSize * sizeof(int32));
  63
  64   consumer.Start();
  65   consumer.message_loop()->PostTask(
  66       FROM_HERE, base::Bind(&WriteToState, buffer.get(),
  67                             shared_state_.get()));
  68
  69   CommandBuffer::State last_state;
  70   while (1) {
  71     CommandBuffer::State state = last_state;
  72
  73     shared_state_->Read(&state);
  74
  75     if (state.generation < last_state.generation)
  76       continue;
  77
  78     if (state.get_offset >= 1) {
  79       buffer[state.get_offset - 1] = 1;
  80       // Check that the state is consistent
  81       EXPECT_LE(last_state.token, state.token);
  82       EXPECT_LE(last_state.generation, state.generation);
  83       last_state = state;
  84       EXPECT_EQ(state.token, state.get_offset - 2);
  85       EXPECT_EQ(state.generation,
  86                 static_cast<unsigned int>(state.get_offset) + 1);
  87       EXPECT_EQ(state.error, state.get_offset + 2);
  88
  89       if (state.get_offset == kSize)
  90         break;
  91     }
  92   }
  93 }
  94
  95 }  // namespace gpu
  96