Implement EXT_draw_buffers WebGL extention support in command buffer.

gpu/command_buffer/service/gles2_cmd_decoder_autogen.h

 // 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.
 
 // This file is auto-generated from
 // gpu/command_buffer/build_gles2_cmd_buffer.py
 // DO NOT EDIT!
 
 // It is included by gles2_cmd_decoder.cc
 #ifndef GPU_COMMAND_BUFFER_SERVICE_GLES2_CMD_DECODER_AUTOGEN_H_
@@ skipping 3163 matching lines @@
     SetGLError(GL_INVALID_VALUE, "glDiscardFramebufferEXT", "count < 0");
     return error::kNoError;
   }
   if (attachments == NULL) {
     return error::kOutOfBounds;
   }
   DoDiscardFramebufferEXT(target, count, attachments);
   return error::kNoError;
 }
 
+error::Error GLES2DecoderImpl::HandleDrawBuffersEXT(
+    uint32 immediate_data_size, const gles2::cmds::DrawBuffersEXT& c) {
+  GLsizei count = static_cast<GLsizei>(c.count);
+  uint32 data_size;
+  if (!ComputeDataSize(count, sizeof(GLenum), 1, &data_size)) {
+    return error::kOutOfBounds;
+  }
+  const GLenum* bufs = GetSharedMemoryAs<const GLenum*>(
+      c.bufs_shm_id, c.bufs_shm_offset, data_size);
+  if (count < 0) {
+    SetGLError(GL_INVALID_VALUE, "glDrawBuffersEXT", "count < 0");
+    return error::kNoError;
+  }
+  if (bufs == NULL) {
+    return error::kOutOfBounds;
+  }
+  DoDrawBuffersEXT(count, bufs);
+  return error::kNoError;
+}
+
+error::Error GLES2DecoderImpl::HandleDrawBuffersEXTImmediate(
+    uint32 immediate_data_size,
+    const gles2::cmds::DrawBuffersEXTImmediate& c) {
+  GLsizei count = static_cast<GLsizei>(c.count);
+  uint32 data_size;
+  if (!ComputeDataSize(count, sizeof(GLenum), 1, &data_size)) {
+    return error::kOutOfBounds;
+  }
+  if (data_size > immediate_data_size) {
+    return error::kOutOfBounds;
+  }
+  const GLenum* bufs = GetImmediateDataAs<const GLenum*>(
+      c, data_size, immediate_data_size);
+  if (count < 0) {
+    SetGLError(GL_INVALID_VALUE, "glDrawBuffersEXT", "count < 0");
+    return error::kNoError;
+  }
+  if (bufs == NULL) {
+    return error::kOutOfBounds;
+  }
+  DoDrawBuffersEXT(count, bufs);
+  return error::kNoError;
+}
+
 
 bool GLES2DecoderImpl::SetCapabilityState(GLenum cap, bool enabled) {
   switch (cap) {
     case GL_BLEND:
       state_.enable_flags.blend = enabled;
       return true;
     case GL_CULL_FACE:
       state_.enable_flags.cull_face = enabled;
       return true;
     case GL_DEPTH_TEST:
@@ skipping 26 matching lines @@
         clear_state_dirty_ = true;
       }
       return false;
     default:
       NOTREACHED();
       return false;
   }
 }
 #endif  // GPU_COMMAND_BUFFER_SERVICE_GLES2_CMD_DECODER_AUTOGEN_H_