Use GL_LINEAR for backing texture of offscreen framebuffer.

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 <list>
@@ skipping 2001 matching lines @@
   // destroyed.
   DCHECK_EQ(id_, 0u);
 }
 
 void BackTexture::Create() {
   ScopedGLErrorSuppressor suppressor("BackTexture::Create",
                                      state_->GetErrorState());
   Destroy();
   glGenTextures(1, &id_);
   ScopedTextureBinder binder(state_, id_, GL_TEXTURE_2D);
-  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
-  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
 
   // TODO(apatrick): Attempt to diagnose crbug.com/97775. If SwapBuffers is
   // never called on an offscreen context, no data will ever be uploaded to the
   // saved offscreen color texture (it is deferred until to when SwapBuffers
   // is called). My idea is that some nvidia drivers might have a bug where
   // deleting a texture that has never been populated might cause a
   // crash.
   glTexImage2D(
@@ skipping 1252 matching lines @@
       1,  // depth
       0,  // border
       GL_RGBA,
       GL_UNSIGNED_BYTE,
       true);
   texture_manager()->SetParameteri(
       "UpdateParentTextureInfo",
       GetErrorState(),
       offscreen_saved_color_texture_info_.get(),
       GL_TEXTURE_MAG_FILTER,
-      GL_NEAREST);
+      GL_LINEAR);
   texture_manager()->SetParameteri(
       "UpdateParentTextureInfo",
       GetErrorState(),
       offscreen_saved_color_texture_info_.get(),
       GL_TEXTURE_MIN_FILTER,
-      GL_NEAREST);
+      GL_LINEAR);
   texture_manager()->SetParameteri(
       "UpdateParentTextureInfo",
       GetErrorState(),
       offscreen_saved_color_texture_info_.get(),
       GL_TEXTURE_WRAP_S,
       GL_CLAMP_TO_EDGE);
   texture_manager()->SetParameteri(
       "UpdateParentTextureInfo",
       GetErrorState(),
       offscreen_saved_color_texture_info_.get(),
@@ skipping 7617 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