Check for some extensions before calling potentially NULL GL entry points.

gpu/command_buffer/service/feature_info.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/feature_info.h"
 
 #include <stddef.h>
 
 #include <set>
 #include <vector>
@@ skipping 683 matching lines @@
   feature_flags_.arb_es3_compatibility =
       extensions.Contains("GL_ARB_ES3_compatibility") &&
       !gl_version_info_->is_es;
 
   // glGetInteger64v for timestamps is implemented on the client side in a way
   // that it does not depend on a driver-level implementation of
   // glGetInteger64v. The GPUTimer class which implements timer queries can also
   // fallback to an implementation that does not depend on glGetInteger64v on
   // ES2. Thus we can enable GL_EXT_disjoint_timer_query on ES2 contexts even
   // though it does not support glGetInteger64v due to a specification bug.
-  if (extensions.Contains("GL_EXT_disjoint_timer_query") ||
+  feature_flags_.ext_disjoint_timer_query =
+      extensions.Contains("GL_EXT_disjoint_timer_query");
+  if (feature_flags_.ext_disjoint_timer_query ||
       extensions.Contains("GL_ARB_timer_query") ||
       extensions.Contains("GL_EXT_timer_query")) {
     AddExtensionString("GL_EXT_disjoint_timer_query");
   }
 
   if (extensions.Contains("GL_OES_rgb8_rgba8") || gl::HasDesktopGLFeatures()) {
     AddExtensionString("GL_OES_rgb8_rgba8");
     validators_.render_buffer_format.AddValue(GL_RGB8_OES);
     validators_.render_buffer_format.AddValue(GL_RGBA8_OES);
   }
@@ skipping 174 matching lines @@
       EnableEXTColorBufferFloat();
   }
 
   // Check for multisample support
   if (!workarounds_.disable_chromium_framebuffer_multisample) {
     bool ext_has_multisample =
         extensions.Contains("GL_EXT_framebuffer_multisample") ||
         gl_version_info_->is_es3 ||
         gl_version_info_->is_desktop_core_profile;
     if (gl_version_info_->is_angle) {
-      ext_has_multisample |=
+      feature_flags_.angle_framebuffer_multisample =
           extensions.Contains("GL_ANGLE_framebuffer_multisample");
+      ext_has_multisample |= feature_flags_.angle_framebuffer_multisample;
     }
     feature_flags_.use_core_framebuffer_multisample =
         gl_version_info_->is_es3 || gl_version_info_->is_desktop_core_profile;
     if (ext_has_multisample) {
       feature_flags_.chromium_framebuffer_multisample = true;
       validators_.framebuffer_target.AddValue(GL_READ_FRAMEBUFFER_EXT);
       validators_.framebuffer_target.AddValue(GL_DRAW_FRAMEBUFFER_EXT);
       validators_.g_l_state.AddValue(GL_READ_FRAMEBUFFER_BINDING_EXT);
       validators_.g_l_state.AddValue(GL_MAX_SAMPLES_EXT);
       validators_.render_buffer_parameter.AddValue(GL_RENDERBUFFER_SAMPLES_EXT);
@@ skipping 483 matching lines @@
       extensions.Contains("GL_ANGLE_robust_client_memory");
 
   feature_flags_.khr_debug = gl_version_info_->IsAtLeastGL(4, 3) ||
                              gl_version_info_->IsAtLeastGLES(3, 2) ||
                              extensions.Contains("GL_KHR_debug");
 
   feature_flags_.chromium_bind_generates_resource =
       extensions.Contains("GL_CHROMIUM_bind_generates_resource");
   feature_flags_.angle_webgl_compatibility =
       extensions.Contains("GL_ANGLE_webgl_compatibility");
+  feature_flags_.chromium_copy_texture =
+      extensions.Contains("GL_CHROMIUM_copy_texture");
+  feature_flags_.chromium_copy_compressed_texture =
+      extensions.Contains("GL_CHROMIUM_copy_compressed_texture");
 }
 
 bool FeatureInfo::IsES3Capable() const {
   if (workarounds_.disable_texture_storage)
     return false;
   if (gl_version_info_)
     return gl_version_info_->is_es3_capable;
   return false;
 }
 
@@ skipping 123 matching lines @@
   if (pos == std::string::npos) {
     extensions_ += (extensions_.empty() ? "" : " ") + str;
   }
 }
 
 FeatureInfo::~FeatureInfo() {
 }
 
 }  // namespace gles2
 }  // namespace gpu