gpu: Clarify sized texture format is available only if ES3 context or immutable texture is supported

gpu/command_buffer/service/texture_manager.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/texture_manager.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <algorithm>
@@ skipping 134 matching lines @@
         {GL_ALPHA, GL_ALPHA, GL_HALF_FLOAT_OES},
         // Exposed by GL_ANGLE_depth_texture
         {GL_DEPTH_COMPONENT, GL_DEPTH_COMPONENT, GL_UNSIGNED_SHORT},
         {GL_DEPTH_COMPONENT, GL_DEPTH_COMPONENT, GL_UNSIGNED_INT},
         {GL_DEPTH_STENCIL, GL_DEPTH_STENCIL, GL_UNSIGNED_INT_24_8},
         // Exposed by GL_EXT_sRGB
         {GL_SRGB, GL_SRGB, GL_UNSIGNED_BYTE},
         {GL_SRGB_ALPHA, GL_SRGB_ALPHA, GL_UNSIGNED_BYTE},
         // Exposed by GL_EXT_texture_format_BGRA8888
         {GL_BGRA_EXT, GL_BGRA_EXT, GL_UNSIGNED_BYTE},
+        {GL_BGRA8_EXT, GL_BGRA_EXT, GL_UNSIGNED_BYTE},
         // Exposed by GL_EXT_texture_rg
         {GL_RED, GL_RED, GL_UNSIGNED_BYTE},
         {GL_RG, GL_RG, GL_UNSIGNED_BYTE},
         {GL_RED, GL_RED, GL_FLOAT},
         {GL_RG, GL_RG, GL_FLOAT},
         {GL_RED, GL_RED, GL_HALF_FLOAT_OES},
         {GL_RG, GL_RG, GL_HALF_FLOAT_OES},
 
         // ES3.
         {GL_R8, GL_RED, GL_UNSIGNED_BYTE},
@@ skipping 589 matching lines @@
   }
   return feature_info->validators()->
       texture_sized_color_renderable_internal_format.IsValid(internal_format);
 }
 
 // static
 bool Texture::TextureFilterable(const FeatureInfo* feature_info,
                                 GLenum internal_format,
                                 GLenum type) {
   if (feature_info->validators()->texture_unsized_internal_format.IsValid(
-      internal_format)) {
+          internal_format) ||
+      feature_info->validators()
+          ->texture_sized_color_renderable_internal_format.IsValid(
+              internal_format)) {
     switch (type) {
       case GL_FLOAT:
         return feature_info->feature_flags().enable_texture_float_linear;
       case GL_HALF_FLOAT_OES:
         return feature_info->feature_flags().enable_texture_half_float_linear;
       default:
         // GL_HALF_FLOAT is ES3 only and should only be used with sized formats.
         return true;
     }
   }
@@ skipping 2589 matching lines @@
 uint32_t TextureManager::GetServiceIdGeneration() const {
   return current_service_id_generation_;
 }
 
 void TextureManager::IncrementServiceIdGeneration() {
   current_service_id_generation_++;
 }
 
 }  // namespace gles2
 }  // namespace gpu