Decompress ETC texture data when there is no native support.

gpu/command_buffer/service/context_state.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_state.h"
 
 #include <stddef.h>
 
 #include <cmath>
 
@@ skipping 247 matching lines @@
     glBindTexture(GL_TEXTURE_CUBE_MAP, service_id_cube);
   }
   if (bind_texture_oes) {
     glBindTexture(GL_TEXTURE_EXTERNAL_OES, service_id_oes);
   }
   if (bind_texture_arb) {
     glBindTexture(GL_TEXTURE_RECTANGLE_ARB, service_id_arb);
   }
 }
 
+void ContextState::RestoreUnpackState() const {
+  glBindBuffer(GL_PIXEL_UNPACK_BUFFER,
+               GetBufferId(bound_pixel_unpack_buffer.get()));
+  glPixelStorei(GL_UNPACK_ALIGNMENT, unpack_alignment);
+  glPixelStorei(GL_UNPACK_SKIP_ROWS, unpack_skip_rows);
+  glPixelStorei(GL_UNPACK_SKIP_PIXELS, unpack_skip_images);
+  glPixelStorei(GL_UNPACK_SKIP_IMAGES, unpack_skip_images);

[piman, 2016/07/08 19:30:39]

We never pass GL_UNPACK_SKIP_ROWS/PIXELS/IMAGES to the driver (because we handle
them manually), so we should leave those to their default value

+
+  // UpdateUnpackParameters restores the GL_UNPACK_ROW_LENGTH and
+  // GL_UNPACK_IMAGE_HEIGHT parameters
+  UpdateUnpackParameters();
+}
+
 void ContextState::RestoreBufferBindings() const {
   if (vertex_attrib_manager.get()) {
     Buffer* element_array_buffer =
         vertex_attrib_manager->element_array_buffer();
     glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, GetBufferId(element_array_buffer));
   }
   glBindBuffer(GL_ARRAY_BUFFER, GetBufferId(bound_array_buffer.get()));
   if (feature_info_->IsES3Capable()) {
     glBindBuffer(GL_COPY_READ_BUFFER,
                  GetBufferId(bound_copy_read_buffer.get()));
@@ skipping 389 matching lines @@
   UpdateUnpackParameters();
 }
 
 // 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/context_state_impl_autogen.h"
 
 }  // namespace gles2
 }  // namespace gpu