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

gpu/command_buffer/service/program_manager.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.
 
 #ifndef GPU_COMMAND_BUFFER_SERVICE_PROGRAM_MANAGER_H_
 #define GPU_COMMAND_BUFFER_SERVICE_PROGRAM_MANAGER_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 81 matching lines @@
   struct UniformInfo {
     UniformInfo();
     UniformInfo(const UniformInfo& other);
     UniformInfo(const std::string& client_name,
                 GLint client_location_base,
                 GLenum _type,
                 bool _is_array,
                 const std::vector<GLint>& service_locations);
     ~UniformInfo();
     bool IsSampler() const {
-      return type == GL_SAMPLER_2D || type == GL_SAMPLER_2D_RECT_ARB ||
-             type == GL_SAMPLER_CUBE || type == GL_SAMPLER_EXTERNAL_OES;
+      switch (type) {
+        case GL_SAMPLER_2D:
+        case GL_SAMPLER_2D_RECT_ARB:
+        case GL_SAMPLER_CUBE:
+        case GL_SAMPLER_EXTERNAL_OES:
+        case GL_SAMPLER_3D:
+        case GL_SAMPLER_2D_SHADOW:
+        case GL_SAMPLER_2D_ARRAY:
+        case GL_SAMPLER_2D_ARRAY_SHADOW:
+        case GL_SAMPLER_CUBE_SHADOW:
+        case GL_INT_SAMPLER_2D:
+        case GL_INT_SAMPLER_3D:
+        case GL_INT_SAMPLER_CUBE:
+        case GL_INT_SAMPLER_2D_ARRAY:
+        case GL_UNSIGNED_INT_SAMPLER_2D:
+        case GL_UNSIGNED_INT_SAMPLER_3D:
+        case GL_UNSIGNED_INT_SAMPLER_CUBE:
+        case GL_UNSIGNED_INT_SAMPLER_2D_ARRAY:
+          return true;
+        default:
+          return false;
+      }
     }
 
     GLsizei size;
     GLenum type;
     uint32_t accepts_api_type;
     GLint fake_location_base;
     bool is_array;
     std::string name;
     std::vector<GLint> element_locations;
     std::vector<GLuint> texture_units;
@@ skipping 595 matching lines @@
 };
 
 inline const FeatureInfo& Program::feature_info() const {
   return *manager_->feature_info_.get();
 }
 
 }  // namespace gles2
 }  // namespace gpu
 
 #endif  // GPU_COMMAND_BUFFER_SERVICE_PROGRAM_MANAGER_H_