Rebind EGL context to flush driver caches.

gpu/command_buffer/service/gles2_cmd_decoder.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 <stdio.h>
 
 #include <algorithm>
 #include <cmath>
@@ skipping 1080 matching lines @@
   void DoReleaseTexImage2DCHROMIUM(
       GLenum target,
       GLint image_id);
 
   void DoTraceEndCHROMIUM(void);
 
   void DoDrawBuffersEXT(GLsizei count, const GLenum* bufs);
 
   void DoLoseContextCHROMIUM(GLenum current, GLenum other);
 
+  void DoFlushDriverCachesCHROMIUM(void);
+
   void DoMatrixLoadfCHROMIUM(GLenum matrix_mode, const GLfloat* matrix);
   void DoMatrixLoadIdentityCHROMIUM(GLenum matrix_mode);
 
   // Creates a Program for the given program.
   Program* CreateProgram(
       GLuint client_id, GLuint service_id) {
     return program_manager()->CreateProgram(client_id, service_id);
   }
 
   // Gets the program info for the given program. Returns NULL if none exists.
@@ skipping 11964 matching lines @@
     group_->set_draw_buffer(bufs[0]);
   }
 }
 
 void GLES2DecoderImpl::DoLoseContextCHROMIUM(GLenum current, GLenum other) {
   MarkContextLost(GetContextLostReasonFromResetStatus(current));
   group_->LoseContexts(GetContextLostReasonFromResetStatus(other));
   reset_by_robustness_extension_ = true;
 }
 
+void GLES2DecoderImpl::DoFlushDriverCachesCHROMIUM(void) {
+  // Normally, we should just need to call glFinish to flush driver caches.
+  glFinish();
+
+  // On Adreno Android devices we need to use a workaround to force more caches
+  // to clear.
+  if (feature_info_->workarounds().unbind_egl_context_to_flush_driver_caches) {
+    context_->MakeCurrent(nullptr);

[piman, 2015/07/13 21:25:29]

How about context_->ReleaseCurrent() here, instead of adding logic to handle
MakeCurrent(nullptr) in other places?

[ericrk, 2015/07/13 22:11:11]

good point.

+    context_->MakeCurrent(surface_.get());
+  }
+}
+
 void GLES2DecoderImpl::DoMatrixLoadfCHROMIUM(GLenum matrix_mode,
                                              const GLfloat* matrix) {
   DCHECK(matrix_mode == GL_PATH_PROJECTION_CHROMIUM ||
          matrix_mode == GL_PATH_MODELVIEW_CHROMIUM);
   if (!features().chromium_path_rendering) {
     LOCAL_SET_GL_ERROR(GL_INVALID_OPERATION,
                        "glMatrixLoadfCHROMIUM",
                        "function not available");
     return;
   }
@@ skipping 593 matching lines @@
   }
 }
 
 // Include the auto-generated part of this file. We split this because it means
 // we can easily edit the non-auto generated parts right here in this file
 // instead of having to edit some template or the code generator.
 #include "gpu/command_buffer/service/gles2_cmd_decoder_autogen.h"
 
 }  // namespace gles2
 }  // namespace gpu