ES3 sampler types and their corresponding textures should be initialized before being sampled.

gpu/command_buffer/service/context_state.h

 // 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.
 
 // This file contains the ContextState class.
 
 #ifndef GPU_COMMAND_BUFFER_SERVICE_CONTEXT_STATE_H_
 #define GPU_COMMAND_BUFFER_SERVICE_CONTEXT_STATE_H_
 
 #include <memory>
@@ skipping 50 matching lines @@
   scoped_refptr<TextureRef> bound_texture_3d;
 
   // texture currently bound to this unit's GL_TEXTURE_2D_ARRAY with
   // glBindTexture
   scoped_refptr<TextureRef> bound_texture_2d_array;
 
   scoped_refptr<TextureRef> GetInfoForSamplerType(
       GLenum type) {
     switch (type) {
       case GL_SAMPLER_2D:
+      case GL_SAMPLER_2D_SHADOW:
+      case GL_INT_SAMPLER_2D:
+      case GL_UNSIGNED_INT_SAMPLER_2D:
         return bound_texture_2d;
       case GL_SAMPLER_CUBE:
+      case GL_SAMPLER_CUBE_SHADOW:
+      case GL_INT_SAMPLER_CUBE:
+      case GL_UNSIGNED_INT_SAMPLER_CUBE:
         return bound_texture_cube_map;
       case GL_SAMPLER_EXTERNAL_OES:
         return bound_texture_external_oes;
       case GL_SAMPLER_2D_RECT_ARB:
         return bound_texture_rectangle_arb;
       case GL_SAMPLER_3D:
+      case GL_INT_SAMPLER_3D:
+      case GL_UNSIGNED_INT_SAMPLER_3D:
         return bound_texture_3d;
       case GL_SAMPLER_2D_ARRAY:
+      case GL_SAMPLER_2D_ARRAY_SHADOW:
+      case GL_INT_SAMPLER_2D_ARRAY:
+      case GL_UNSIGNED_INT_SAMPLER_2D_ARRAY:
         return bound_texture_2d_array;
     }
 
     NOTREACHED();
-    return NULL;
+    return nullptr;
   }
 
   scoped_refptr<TextureRef>& GetInfoForTarget(GLenum target) {
     switch (target) {
       case GL_TEXTURE_2D:
         return bound_texture_2d;
       case GL_TEXTURE_CUBE_MAP:
         return bound_texture_cube_map;
       case GL_TEXTURE_EXTERNAL_OES:
         return bound_texture_external_oes;
@@ skipping 259 matching lines @@
   GLfloat line_width_max_ = 1.0f;
 
   FeatureInfo* feature_info_;
   std::unique_ptr<ErrorState> error_state_;
 };
 
 }  // namespace gles2
 }  // namespace gpu
 
 #endif  // GPU_COMMAND_BUFFER_SERVICE_CONTEXT_STATE_H_
-