Implement TransformFeedbackManager in GPU command buffer.

gpu/command_buffer/service/gles2_cmd_decoder_unittest.cc

 // Copyright (c) 2012 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/gles2_cmd_decoder_unittest.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include "base/command_line.h"
@@ skipping 1406 matching lines @@
 
 TEST_P(GLES2DecoderTest, LoseContextCHROMIUMInvalidArgs1_0) {
   EXPECT_CALL(*mock_decoder_, MarkContextLost(_))
       .Times(0);
   cmds::LoseContextCHROMIUM cmd;
   cmd.Init(GL_GUILTY_CONTEXT_RESET_ARB, GL_NONE);
   EXPECT_EQ(error::kNoError, ExecuteCmd(cmd));
   EXPECT_EQ(GL_INVALID_ENUM, GetGLError());
 }
 
+TEST_P(GLES3DecoderTest, TransformFeedbackStates) {
+  cmds::BeginTransformFeedback begin_cmd;
+  begin_cmd.Init(GL_POINTS);
+  cmds::EndTransformFeedback end_cmd;
+  end_cmd.Init();
+  cmds::PauseTransformFeedback pause_cmd;
+  pause_cmd.Init();
+  cmds::ResumeTransformFeedback resume_cmd;
+  resume_cmd.Init();
+
+  // Before Begin: Pause, Resume, and End is invalid.
+  EXPECT_EQ(error::kNoError, ExecuteCmd(end_cmd));
+  EXPECT_EQ(GL_INVALID_OPERATION, GetGLError());
+
+  EXPECT_EQ(error::kNoError, ExecuteCmd(pause_cmd));
+  EXPECT_EQ(GL_INVALID_OPERATION, GetGLError());
+
+  EXPECT_EQ(error::kNoError, ExecuteCmd(resume_cmd));
+  EXPECT_EQ(GL_INVALID_OPERATION, GetGLError());
+
+  // Begin
+  EXPECT_CALL(*gl_, BeginTransformFeedback(GL_POINTS))
+      .Times(1)
+      .RetiresOnSaturation();
+  EXPECT_EQ(error::kNoError, ExecuteCmd(begin_cmd));
+  EXPECT_EQ(GL_NO_ERROR, GetGLError());
+
+  // Begin again is invalid.
+  EXPECT_EQ(error::kNoError, ExecuteCmd(begin_cmd));
+  EXPECT_EQ(GL_INVALID_OPERATION, GetGLError());
+
+  // Before Pause: Resume is invalid.
+  EXPECT_EQ(error::kNoError, ExecuteCmd(resume_cmd));
+  EXPECT_EQ(GL_INVALID_OPERATION, GetGLError());
+
+  // Pause
+  EXPECT_CALL(*gl_, PauseTransformFeedback())
+      .Times(1)
+      .RetiresOnSaturation();
+  EXPECT_EQ(error::kNoError, ExecuteCmd(pause_cmd));
+  EXPECT_EQ(GL_NO_ERROR, GetGLError());
+
+  // Pause again is invalid.
+  EXPECT_EQ(error::kNoError, ExecuteCmd(pause_cmd));
+  EXPECT_EQ(GL_INVALID_OPERATION, GetGLError());
+
+  // Resume
+  EXPECT_CALL(*gl_, ResumeTransformFeedback())
+      .Times(1)
+      .RetiresOnSaturation();
+  EXPECT_EQ(error::kNoError, ExecuteCmd(resume_cmd));
+  EXPECT_EQ(GL_NO_ERROR, GetGLError());
+
+  // End
+  EXPECT_CALL(*gl_, EndTransformFeedback())
+      .Times(1)
+      .RetiresOnSaturation();
+  EXPECT_EQ(error::kNoError, ExecuteCmd(end_cmd));
+  EXPECT_EQ(GL_NO_ERROR, GetGLError());
+}
+
 class GLES2DecoderDoCommandsTest : public GLES2DecoderTest {
  public:
   GLES2DecoderDoCommandsTest() {
     for (int i = 0; i < 3; i++) {
       cmds_[i].Init(GL_BLEND);
     }
     entries_per_cmd_ = ComputeNumEntries(cmds_[0].ComputeSize());
   }
 
   void SetExpectationsForNCommands(int num_commands) {
@@ skipping 109 matching lines @@
 INSTANTIATE_TEST_CASE_P(Service, GLES2DecoderDoCommandsTest, ::testing::Bool());
 
 INSTANTIATE_TEST_CASE_P(Service, GLES3DecoderTest, ::testing::Bool());
 
 INSTANTIATE_TEST_CASE_P(Service,
                         GLES3DecoderWithESSL3ShaderTest,
                         ::testing::Bool());
 
 }  // namespace gles2
 }  // namespace gpu