Implement EXT_draw_buffers WebGL extention support in 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.h"
 
 #include "base/atomicops.h"
 #include "gpu/command_buffer/common/gles2_cmd_format.h"
 #include "gpu/command_buffer/common/gles2_cmd_utils.h"
 #include "gpu/command_buffer/common/id_allocator.h"
@@ skipping 8385 matching lines @@
   // Check we get out of memory and no call to glBufferData if Ensure
   // fails.
   EXPECT_CALL(*memory_tracker, EnsureGPUMemoryAvailable(128))
       .WillOnce(Return(false))
       .RetiresOnSaturation();
   EXPECT_EQ(error::kNoError, ExecuteCmd(cmd));
   EXPECT_EQ(GL_OUT_OF_MEMORY, GetGLError());
   EXPECT_EQ(128u, memory_tracker->GetPoolSize(MemoryTracker::kManaged));
 }
 
+TEST_F(GLES2DecoderTest, DrawBuffersEXTImmediateSuccceeds) {
+  const GLsizei count = 1;
+  const GLenum bufs[] = { GL_COLOR_ATTACHMENT0 };
+  DrawBuffersEXTImmediate& cmd =
+      *GetImmediateAs<DrawBuffersEXTImmediate>();
+  cmd.Init(count, bufs);
+
+  DoBindFramebuffer(GL_FRAMEBUFFER, client_framebuffer_id_,
+                    kServiceFramebufferId);
+  EXPECT_CALL(*gl_, DrawBuffersARB(count, _))
+      .Times(1)
+      .RetiresOnSaturation();
+  EXPECT_EQ(error::kNoError,
+            ExecuteImmediateCmd(cmd, sizeof(bufs)));
+  EXPECT_EQ(GL_NO_ERROR, GetGLError());
+}
+
+TEST_F(GLES2DecoderTest, DrawBuffersEXTImmediateFails) {
+  const GLsizei count = 1;
+  const GLenum bufs[] = { GL_COLOR_ATTACHMENT1_EXT };
+  DrawBuffersEXTImmediate& cmd =
+      *GetImmediateAs<DrawBuffersEXTImmediate>();
+  cmd.Init(count, bufs);
+
+  DoBindFramebuffer(GL_FRAMEBUFFER, client_framebuffer_id_,
+                    kServiceFramebufferId);
+  EXPECT_EQ(error::kNoError,
+            ExecuteImmediateCmd(cmd, sizeof(bufs)));
+  EXPECT_EQ(GL_INVALID_OPERATION, GetGLError());
+}
+
+TEST_F(GLES2DecoderTest, DrawBuffersEXTImmediateBackbuffer) {
+  const GLsizei count = 1;
+  const GLenum bufs[] = { GL_BACK };
+  DrawBuffersEXTImmediate& cmd =
+      *GetImmediateAs<DrawBuffersEXTImmediate>();
+  cmd.Init(count, bufs);
+
+  DoBindFramebuffer(GL_FRAMEBUFFER, client_framebuffer_id_,
+                    kServiceFramebufferId);
+  EXPECT_EQ(error::kNoError,
+            ExecuteImmediateCmd(cmd, sizeof(bufs)));
+  EXPECT_EQ(GL_INVALID_OPERATION, GetGLError());
+
+  DoBindFramebuffer(GL_FRAMEBUFFER, 0, 0);  // unbind
+
+  EXPECT_CALL(*gl_, DrawBuffersARB(count, _))
+      .Times(1)
+      .RetiresOnSaturation();
+
+  EXPECT_EQ(error::kNoError,
+            ExecuteImmediateCmd(cmd, sizeof(bufs)));
+  EXPECT_EQ(GL_NO_ERROR, GetGLError());
+}
+
 // TODO(gman): Complete this test.
 // TEST_F(GLES2DecoderTest, CompressedTexImage2DGLError) {
 // }
 
 // TODO(gman): BufferData
 
 // TODO(gman): BufferDataImmediate
 
 // TODO(gman): BufferSubData
 
@@ skipping 16 matching lines @@
 // TODO(gman): TexImage2DImmediate
 
 // TODO(gman): TexSubImage2DImmediate
 
 // TODO(gman): UseProgram
 
 // TODO(gman): SwapBuffers
 
 }  // namespace gles2
 }  // namespace gpu