Implement SamplerManager in the command buffer

gpu/command_buffer/service/sampler_manager.h

+// Copyright (c) 2015 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_SAMPLER_MANAGER_H_
+#define GPU_COMMAND_BUFFER_SERVICE_SAMPLER_MANAGER_H_
+
+#include <vector>
+#include "base/basictypes.h"
+#include "base/containers/hash_tables.h"
+#include "base/logging.h"
+#include "base/memory/ref_counted.h"
+#include "base/memory/scoped_ptr.h"
+#include "gpu/command_buffer/service/feature_info.h"
+#include "gpu/command_buffer/service/gl_utils.h"
+#include "gpu/gpu_export.h"
+
+namespace gpu {
+
+namespace gles2 {
+
+class SamplerManager;
+
+class GPU_EXPORT Sampler : public base::RefCounted<Sampler> {
+ public:
+  Sampler(SamplerManager* manager, GLuint service_id);
+
+  // The service side OpenGL id of the texture.
+  GLuint service_id() const {
+    return service_id_;
+  }
+
+  // Sampler parameters
+  GLenum min_filter() const {
+    return min_filter_;
+  }
+
+  GLenum mag_filter() const {
+    return mag_filter_;
+  }
+
+  GLenum wrap_r() const {
+    return wrap_r_;
+  }
+
+  GLenum wrap_s() const {
+    return wrap_s_;
+  }
+
+  GLenum wrap_t() const {
+    return wrap_t_;
+  }
+
+  GLenum compare_func() const {
+    return compare_func_;
+  }
+
+  GLenum compare_mode() const {
+    return compare_mode_;
+  }
+
+  GLfloat max_lod() const {
+    return max_lod_;
+  }
+
+  GLfloat min_lod() const {
+    return min_lod_;
+  }
+
+  bool IsDeleted() const {
+    return deleted_;
+  }
+
+ protected:
+  virtual ~Sampler();
+
+  SamplerManager* manager() const {
+    return manager_;
+  }
+
+  void MarkAsDeleted() {
+    deleted_ = true;
+  }
+
+ private:
+  friend class SamplerManager;
+  friend class base::RefCounted<Sampler>;
+
+  // Sets a sampler parameter.
+  // Returns GL_NO_ERROR on success. Otherwise the error to generate.
+  GLenum SetParameteri(
+      const FeatureInfo* feature_info, GLenum pname, GLint param);
+  GLenum SetParameterf(
+      const FeatureInfo* feature_info, GLenum pname, GLfloat param);
+
+  // The manager that owns this Sampler.
+  SamplerManager* manager_;
+
+    // The id of the texure
+  GLuint service_id_;
+
+  // Texture parameters.
+  GLenum min_filter_;
+  GLenum mag_filter_;
+  GLenum wrap_r_;
+  GLenum wrap_s_;
+  GLenum wrap_t_;
+  GLenum usage_;
+  GLenum compare_func_;
+  GLenum compare_mode_;
+  GLfloat max_lod_;
+  GLfloat min_lod_;
+  GLint base_level_;
+  GLint max_level_;
+
+  // True if deleted.
+  bool deleted_;
+};
+
+// This class keeps track of the samplers and their state.
+class GPU_EXPORT SamplerManager {
+ public:
+  SamplerManager(FeatureInfo* feature_info);
+  ~SamplerManager();
+
+  // Must call before destruction.
+  void Destroy(bool have_context);
+
+  // Creates a Sampler for the given sampler.
+  Sampler* CreateSampler(GLuint client_id, GLuint service_id);
+
+  // Gets the Sampler info for the given sampler.
+  Sampler* GetSampler(GLuint client_id);
+
+  // Removes a Sampler info for the given sampler.
+  void RemoveSampler(GLuint client_id);
+
+  // Sets a sampler parameter of a Sampler.
+  // Returns GL_NO_ERROR on success. Otherwise the error to generate.
+  void SetParameteri(
+      const char* function_name, ErrorState* error_state,
+      Sampler* sampler, GLenum pname, GLint param);
+  void SetParameterf(
+      const char* function_name, ErrorState* error_state,
+      Sampler* sampler, GLenum pname, GLfloat param);
+
+ private:
+  friend class Sampler;
+
+  scoped_refptr<FeatureInfo> feature_info_;
+
+  // Info for each sampler in the system.
+  typedef base::hash_map<GLuint, scoped_refptr<Sampler> > SamplerMap;
+  SamplerMap samplers_;
+
+  bool have_context_;
+
+  DISALLOW_COPY_AND_ASSIGN(SamplerManager);
+};
+
+}  // namespace gles2
+}  // namespace gpu
+
+#endif  // GPU_COMMAND_BUFFER_SERVICE_SAMPLER_MANAGER_H_