Clear uniforms

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 <map>
 #include <string>
 #include <vector>
@@ skipping 126 matching lines @@
     bool IsValid() const {
       return valid_;
     }
 
     bool AttachShader(ShaderManager* manager, ShaderManager::ShaderInfo* info);
     bool DetachShader(ShaderManager* manager, ShaderManager::ShaderInfo* info);
 
     bool CanLink() const;
 
     // Performs glLinkProgram and related activities.
-    void Link();
+    bool Link();
 
     // Performs glValidateProgram and related activities.
     void Validate();
 
     const std::string* log_info() const {
       return log_info_.get();
     }
 
     bool InUse() const {
       DCHECK_GE(use_count_, 0);
@@ skipping 46 matching lines @@
 
     // Resets the program.
     void Reset();
 
     // Updates the program info after a successful link.
     void Update();
 
     // Updates the program log info from GL
     void UpdateLogInfo();
 
+    // Clears all the uniforms.
+    void ClearUniforms(std::vector<uint8>* zero_buffer);
+
     // If long attribate names are mapped during shader translation, call
     // glBindAttribLocation() again with the mapped names.
     // This is called right before the glLink() call, but after shaders are
     // translated.
     void ExecuteBindAttribLocationCalls();
 
     const UniformInfo* AddUniformInfo(
         GLsizei size, GLenum type, GLint location,
         const std::string& name, const std::string& original_name);
 
@@ skipping 41 matching lines @@
 
     // True if this program is marked as deleted.
     bool deleted_;
 
     // This is true if glLinkProgram was successful at least once.
     bool valid_;
 
     // This is true if glLinkProgram was successful last time it was called.
     bool link_status_;
 
+    // True if the uniforms have been cleared.
+    bool uniforms_cleared_;
+
     // Log info
     scoped_ptr<std::string> log_info_;
 
     // attribute-location binding map from glBindAttribLocation() calls.
     std::map<std::string, GLint> bind_attrib_location_map_;
   };
 
   ProgramManager();
   ~ProgramManager();
 
@@ skipping 11 matching lines @@
 
   // Marks a program as deleted. If it is not used the info will be deleted.
   void MarkAsDeleted(ShaderManager* shader_manager, ProgramInfo* info);
 
   // Marks a program as used.
   void UseProgram(ProgramInfo* info);
 
   // Makes a program as unused. If deleted the program info will be removed.
   void UnuseProgram(ShaderManager* shader_manager, ProgramInfo* info);
 
+  // Clears the uniforms for this program.
+  void ClearUniforms(ProgramInfo* info);
+
   // Returns true if prefix is invalid for gl.
   static bool IsInvalidPrefix(const char* name, size_t length);
 
   // Check if a ProgramInfo is owned by this ProgramManager.
   bool IsOwned(ProgramInfo* info);
 
   GLint SwizzleLocation(GLint unswizzled_location) const;
   GLint UnswizzleLocation(GLint swizzled_location) const;
 
  private:
   void StartTracking(ProgramInfo* info);
   void StopTracking(ProgramInfo* info);
 
   // Info for each "successfully linked" program by service side program Id.
   // TODO(gman): Choose a faster container.
   typedef std::map<GLuint, ProgramInfo::Ref> ProgramInfoMap;
   ProgramInfoMap program_infos_;
 
   int uniform_swizzle_;
 
   // Counts the number of ProgramInfo allocated with 'this' as its manager.
   // Allows to check no ProgramInfo will outlive this.
   unsigned int program_info_count_;
 
   bool have_context_;
 
+  // Used to clear uniforms.
+  std::vector<uint8> zero_;
+
   void RemoveProgramInfoIfUnused(
       ShaderManager* shader_manager, ProgramInfo* info);
 
   DISALLOW_COPY_AND_ASSIGN(ProgramManager);
 };
 
 }  // namespace gles2
 }  // namespace gpu
 
 #endif  // GPU_COMMAND_BUFFER_SERVICE_PROGRAM_MANAGER_H_