Command buffers: ensure we only read immediate data once

gpu/command_buffer/service/context_group.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/context_group.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <algorithm>
@@ skipping 142 matching lines @@
       glGetIntegerv(GL_MAX_SAMPLES_IMG, &max_samples);
     } else {
       glGetIntegerv(GL_MAX_SAMPLES, &max_samples);
     }
   }
 
   if (feature_info_->feature_flags().ext_draw_buffers) {
     GetIntegerv(GL_MAX_COLOR_ATTACHMENTS_EXT, &max_color_attachments_);
     if (max_color_attachments_ < 1)
       max_color_attachments_ = 1;
+    if (max_color_attachments_ > 16)
+      max_color_attachments_ = 16;
     GetIntegerv(GL_MAX_DRAW_BUFFERS_ARB, &max_draw_buffers_);
     if (max_draw_buffers_ < 1)
       max_draw_buffers_ = 1;
+    if (max_draw_buffers_ > 16)
+      max_draw_buffers_ = 16;
   }
   if (feature_info_->feature_flags().ext_blend_func_extended) {
     GetIntegerv(GL_MAX_DUAL_SOURCE_DRAW_BUFFERS_EXT,
                 &max_dual_source_draw_buffers_);
     DCHECK(max_dual_source_draw_buffers_ >= 1);
   }
 
   if (feature_info_->gl_version_info().is_es3_capable) {
     const GLint kMinTransformFeedbackSeparateAttribs = 4;
     if (!QueryGLFeatureU(GL_MAX_TRANSFORM_FEEDBACK_SEPARATE_ATTRIBS,
@@ skipping 422 matching lines @@
     GLuint client_id, GLuint* service_id) const {
   Buffer* buffer = buffer_manager_->GetBuffer(client_id);
   if (!buffer)
     return false;
   *service_id = buffer->service_id();
   return true;
 }
 
 }  // namespace gles2
 }  // namespace gpu