Add a "Max. MSAA samples" entry to chrome://gpu.

gpu/config/gpu_info_collector.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/config/gpu_info_collector.h"
 
 #include <string>
 #include <vector>
 
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/string_piece.h"
 #include "base/strings/string_split.h"
+#include "base/strings/stringprintf.h"
 #include "base/trace_event/trace_event.h"
 #include "ui/gl/gl_bindings.h"
 #include "ui/gl/gl_context.h"
 #include "ui/gl/gl_implementation.h"
 #include "ui/gl/gl_surface.h"
 
 namespace {
 
 scoped_refptr<gfx::GLSurface> InitializeGLSurface() {
   scoped_refptr<gfx::GLSurface> surface(
@@ skipping 69 matching lines @@
   if (!context.get()) {
     LOG(ERROR) << "Could not create context for info collection.";
     return kCollectInfoFatalFailure;
   }
 
   gpu_info->gl_renderer = GetGLString(GL_RENDERER);
   gpu_info->gl_vendor = GetGLString(GL_VENDOR);
   gpu_info->gl_extensions = GetGLString(GL_EXTENSIONS);
   gpu_info->gl_version = GetGLString(GL_VERSION);
   std::string glsl_version_string = GetGLString(GL_SHADING_LANGUAGE_VERSION);
+  GLint max_samples = 0;
+  glGetIntegerv(GL_MAX_SAMPLES, &max_samples);
+  gpu_info->max_msaa_samples = base::StringPrintf("%d", max_samples);
 
   gfx::GLWindowSystemBindingInfo window_system_binding_info;
   if (GetGLWindowSystemBindingInfo(&window_system_binding_info)) {
     gpu_info->gl_ws_vendor = window_system_binding_info.vendor;
     gpu_info->gl_ws_version = window_system_binding_info.version;
     gpu_info->gl_ws_extensions = window_system_binding_info.extensions;
     gpu_info->direct_rendering = window_system_binding_info.direct_rendering;
   }
 
   bool supports_robustness =
@@ skipping 20 matching lines @@
                     const GPUInfo& context_gpu_info) {
   DCHECK(basic_gpu_info);
   basic_gpu_info->gl_renderer = context_gpu_info.gl_renderer;
   basic_gpu_info->gl_vendor = context_gpu_info.gl_vendor;
   basic_gpu_info->gl_version = context_gpu_info.gl_version;
   basic_gpu_info->gl_extensions = context_gpu_info.gl_extensions;
   basic_gpu_info->pixel_shader_version =
       context_gpu_info.pixel_shader_version;
   basic_gpu_info->vertex_shader_version =
       context_gpu_info.vertex_shader_version;
+  basic_gpu_info->max_msaa_samples =
+      context_gpu_info.max_msaa_samples;
   basic_gpu_info->gl_ws_vendor = context_gpu_info.gl_ws_vendor;
   basic_gpu_info->gl_ws_version = context_gpu_info.gl_ws_version;
   basic_gpu_info->gl_ws_extensions = context_gpu_info.gl_ws_extensions;
   basic_gpu_info->gl_reset_notification_strategy =
       context_gpu_info.gl_reset_notification_strategy;
 
   if (!context_gpu_info.driver_vendor.empty())
     basic_gpu_info->driver_vendor = context_gpu_info.driver_vendor;
   if (!context_gpu_info.driver_version.empty())
     basic_gpu_info->driver_version = context_gpu_info.driver_version;
 
   basic_gpu_info->can_lose_context = context_gpu_info.can_lose_context;
   basic_gpu_info->sandboxed = context_gpu_info.sandboxed;
   basic_gpu_info->direct_rendering = context_gpu_info.direct_rendering;
   basic_gpu_info->context_info_state = context_gpu_info.context_info_state;
   basic_gpu_info->initialization_time = context_gpu_info.initialization_time;
   basic_gpu_info->video_encode_accelerator_supported_profiles =
       context_gpu_info.video_encode_accelerator_supported_profiles;
 }
 
 }  // namespace gpu