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   void SetUp() override {
  18     shared_state_.reset(new CommandBufferSharedState());
  19     shared_state_->Initialize();
  20   }
  21
  22   scoped_ptr<CommandBufferSharedState> shared_state_;
  23 };
  24
  25 TEST_F(CommandBufferSharedTest, TestBasic) {
  26   CommandBuffer::State state;
  27
  28   shared_state_->Read(&state);
  29
  30   EXPECT_LT(state.generation, 0x80000000);
  31   EXPECT_EQ(state.get_offset, 0);
  32   EXPECT_EQ(state.token, -1);
  33   EXPECT_EQ(state.error, gpu::error::kNoError);
  34   EXPECT_EQ(state.context_lost_reason, gpu::error::kUnknown);
  35 }
  36
  37 static const int kSize = 100000;
  38
  39 void WriteToState(int32 *buffer,
  40                   CommandBufferSharedState* shared_state) {
  41   CommandBuffer::State state;
  42   for (int i = 0; i < kSize; i++) {
  43     state.token = i - 1;
  44     state.get_offset = i + 1;
  45     state.generation = i + 2;
  46     state.error = static_cast<gpu::error::Error>(i + 3);
  47     // Ensure that the producer doesn't update the buffer until after the
  48     // consumer reads from it.
  49     EXPECT_EQ(buffer[i], 0);
  50
  51     shared_state->Write(state);
  52   }
  53 }
  54
  55 TEST_F(CommandBufferSharedTest, TestConsistency) {
  56   scoped_ptr<int32[]> buffer;
  57   buffer.reset(new int32[kSize]);
  58   base::Thread consumer("Reader Thread");
  59
  60   memset(buffer.get(), 0, kSize * sizeof(int32));
  61
  62   consumer.Start();
  63   consumer.message_loop()->PostTask(
  64       FROM_HERE, base::Bind(&WriteToState, buffer.get(),
  65                             shared_state_.get()));
  66
  67   CommandBuffer::State last_state;
  68   while (1) {
  69     CommandBuffer::State state = last_state;
  70
  71     shared_state_->Read(&state);
  72
  73     if (state.generation < last_state.generation)
  74       continue;
  75
  76     if (state.get_offset >= 1) {
  77       buffer[state.get_offset - 1] = 1;
  78       // Check that the state is consistent
  79       EXPECT_LE(last_state.token, state.token);
  80       EXPECT_LE(last_state.generation, state.generation);
  81       last_state = state;
  82       EXPECT_EQ(state.token, state.get_offset - 2);
  83       EXPECT_EQ(state.generation,
  84                 static_cast<unsigned int>(state.get_offset) + 1);
  85       EXPECT_EQ(state.error, state.get_offset + 2);
  86
  87       if (state.get_offset == kSize)
  88         break;
  89     }
  90   }
  91 }
  92
  93 }  // namespace gpu
  94