Fix a bug in compressed texture code path.

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 <limits.h>
 #include <stddef.h>
 #include <stdint.h>
 #include <stdio.h>
@@ skipping 13659 matching lines @@
   }
 
   if (!ValidateCompressedTexFuncData(
           func_name, width, height, depth, format, image_size, data) ||
       !ValidateCompressedTexSubDimensions(
           func_name, target, level, xoffset, yoffset, zoffset,
           width, height, depth, format, texture)) {
     return error::kNoError;
   }
 
-  // Note: There is no need to deal with texture cleared tracking here
-  // because the validation above means you can only get here if the level
-  // is already a matching compressed format and in that case
-  // CompressedTexImage{2|3}D already cleared the texture.
-  DCHECK(texture->IsLevelCleared(target, level));
+  if (!texture->IsLevelCleared(target, level)) {
+    // This can only happen if the compressed texture was allocated
+    // using TexStorage{2|3}D.
+    DCHECK(texture->IsImmutable());
+    GLsizei level_width = 0, level_height = 0, level_depth = 0;
+    bool success = texture->GetLevelSize(
+        target, level, &level_width, &level_height, &level_depth);
+    DCHECK(success);
+    if (xoffset == 0 && width == level_width &&
+        yoffset == 0 && height == level_height &&
+        zoffset == 0 && depth == level_depth) {
+      // We can skip the clear if we're uploading the entire level.
+      texture_manager()->SetLevelCleared(texture_ref, target, level, true);
+    } else {
+      texture_manager()->ClearTextureLevel(this, texture_ref, target, level);
+    }
+    DCHECK(texture->IsLevelCleared(target, level));
+  }
 
   const CompressedFormatInfo* format_info =
       GetCompressedFormatInfo(internal_format);
   if (format_info != nullptr && !format_info->support_check(*feature_info_)) {
     std::unique_ptr<uint8_t[]> decompressed_data = DecompressTextureData(
         state_, *format_info, width, height, depth, image_size, data);
     if (!decompressed_data) {
       MarkContextLost(error::kGuilty);
       group_->LoseContexts(error::kInnocent);
       return error::kLostContext;
@@ skipping 5150 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 "base/macros.h"
 #include "gpu/command_buffer/service/gles2_cmd_decoder_autogen.h"
 
 }  // namespace gles2
 }  // namespace gpu