gpu/command_buffer/service/buffer_manager.h

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef GPU_COMMAND_BUFFER_SERVICE_BUFFER_MANAGER_H_
   6 #define GPU_COMMAND_BUFFER_SERVICE_BUFFER_MANAGER_H_
   7
   8 #include <map>
   9 #include "base/basictypes.h"
  10 #include "base/containers/hash_tables.h"
  11 #include "base/logging.h"
  12 #include "base/memory/ref_counted.h"
  13 #include "base/memory/scoped_ptr.h"
  14 #include "gpu/command_buffer/common/buffer.h"
  15 #include "gpu/command_buffer/service/gl_utils.h"
  16 #include "gpu/command_buffer/service/memory_tracking.h"
  17 #include "gpu/gpu_export.h"
  18
  19 namespace gpu {
  20 namespace gles2 {
  21
  22 class BufferManager;
  23 struct ContextState;
  24 class ErrorState;
  25 class FeatureInfo;
  26 class TestHelper;
  27
  28 // Info about Buffers currently in the system.
  29 class GPU_EXPORT Buffer : public base::RefCounted<Buffer> {
  30  public:
  31   struct MappedRange {
  32     GLintptr offset;
  33     GLsizeiptr size;
  34     GLenum access;
  35     void* pointer;  // Pointer returned by driver.
  36     scoped_refptr<gpu::Buffer> shm;  // Client side mem.
  37
  38     MappedRange(GLintptr offset, GLsizeiptr size, GLenum access,
  39                 void* pointer, scoped_refptr<gpu::Buffer> shm);
  40     ~MappedRange();
  41     void* GetShmPointer() const;
  42   };
  43
  44   Buffer(BufferManager* manager, GLuint service_id);
  45
  46   GLuint service_id() const {
  47     return service_id_;
  48   }
  49
  50   GLsizeiptr size() const {
  51     return size_;
  52   }
  53
  54   GLenum usage() const {
  55     return usage_;
  56   }
  57
  58   // Gets the maximum value in the buffer for the given range interpreted as
  59   // the given type. Returns false if offset and count are out of range.
  60   // offset is in bytes.
  61   // count is in elements of type.
  62   bool GetMaxValueForRange(GLuint offset, GLsizei count, GLenum type,
  63                            GLuint* max_value);
  64
  65   // Returns a pointer to shadowed data.
  66   const void* GetRange(GLintptr offset, GLsizeiptr size) const;
  67
  68   bool IsDeleted() const {
  69     return deleted_;
  70   }
  71
  72   bool IsValid() const {
  73     return initial_target() && !IsDeleted();
  74   }
  75
  76   bool IsClientSideArray() const {
  77     return is_client_side_array_;
  78   }
  79
  80   void SetMappedRange(GLintptr offset, GLsizeiptr size, GLenum access,
  81                       void* pointer, scoped_refptr<gpu::Buffer> shm) {
  82     mapped_range_.reset(new MappedRange(offset, size, access, pointer, shm));
  83   }
  84
  85   void RemoveMappedRange() {
  86     mapped_range_.reset(nullptr);
  87   }
  88
  89   const MappedRange* GetMappedRange() const {
  90     return mapped_range_.get();
  91   }
  92
  93  private:
  94   friend class BufferManager;
  95   friend class BufferManagerTestBase;
  96   friend class base::RefCounted<Buffer>;
  97
  98   // Represents a range in a buffer.
  99   class Range {
 100    public:
 101     Range(GLuint offset, GLsizei count, GLenum type)
 102         : offset_(offset),
 103           count_(count),
 104           type_(type) {
 105     }
 106
 107     // A less functor provided for std::map so it can find ranges.
 108     struct Less {
 109       bool operator() (const Range& lhs, const Range& rhs) const {
 110         if (lhs.offset_ != rhs.offset_) {
 111           return lhs.offset_ < rhs.offset_;
 112         }
 113         if (lhs.count_ != rhs.count_) {
 114           return lhs.count_ < rhs.count_;
 115         }
 116         return lhs.type_ < rhs.type_;
 117       }
 118     };
 119
 120    private:
 121     GLuint offset_;
 122     GLsizei count_;
 123     GLenum type_;
 124   };
 125
 126   ~Buffer();
 127
 128   GLenum initial_target() const {
 129     return initial_target_;
 130   }
 131
 132   void set_initial_target(GLenum target) {
 133     DCHECK_EQ(0u, initial_target_);
 134     initial_target_ = target;
 135   }
 136
 137   bool shadowed() const {
 138     return shadowed_;
 139   }
 140
 141   void MarkAsDeleted() {
 142     deleted_ = true;
 143   }
 144
 145   // Sets the size, usage and initial data of a buffer.
 146   // If shadow is true then if data is NULL buffer will be initialized to 0.
 147   void SetInfo(
 148       GLsizeiptr size, GLenum usage, bool shadow, const GLvoid* data,
 149       bool is_client_side_array);
 150
 151   // Sets a range of data for this buffer. Returns false if the offset or size
 152   // is out of range.
 153   bool SetRange(
 154     GLintptr offset, GLsizeiptr size, const GLvoid * data);
 155
 156   // Clears any cache of index ranges.
 157   void ClearCache();
 158
 159   // Check if an offset, size range is valid for the current buffer.
 160   bool CheckRange(GLintptr offset, GLsizeiptr size) const;
 161
 162   // The manager that owns this Buffer.
 163   BufferManager* manager_;
 164
 165   // A copy of the data in the buffer. This data is only kept if the target
 166   // is backed_ = true.
 167   scoped_ptr<int8[]> shadow_;
 168
 169   // Size of buffer.
 170   GLsizeiptr size_;
 171
 172   // True if deleted.
 173   bool deleted_;
 174
 175   // Whether or not the data is shadowed.
 176   bool shadowed_;
 177
 178   // Whether or not this Buffer is not uploaded to the GPU but just
 179   // sitting in local memory.
 180   bool is_client_side_array_;
 181
 182   // Service side buffer id.
 183   GLuint service_id_;
 184
 185   // The first target of buffer. 0 = unset.
 186   // It is set the first time bindBuffer() is called and cannot be changed.
 187   GLenum initial_target_;
 188
 189   // Usage of buffer.
 190   GLenum usage_;
 191
 192   // Data cached from last glMapBufferRange call.
 193   scoped_ptr<MappedRange> mapped_range_;
 194
 195   // A map of ranges to the highest value in that range of a certain type.
 196   typedef std::map<Range, GLuint, Range::Less> RangeToMaxValueMap;
 197   RangeToMaxValueMap range_set_;
 198 };
 199
 200 // This class keeps track of the buffers and their sizes so we can do
 201 // bounds checking.
 202 //
 203 // NOTE: To support shared resources an instance of this class will need to be
 204 // shared by multiple GLES2Decoders.
 205 class GPU_EXPORT BufferManager {
 206  public:
 207   BufferManager(MemoryTracker* memory_tracker, FeatureInfo* feature_info);
 208   ~BufferManager();
 209
 210   // Must call before destruction.
 211   void Destroy(bool have_context);
 212
 213   // Creates a Buffer for the given buffer.
 214   void CreateBuffer(GLuint client_id, GLuint service_id);
 215
 216   // Gets the buffer info for the given buffer.
 217   Buffer* GetBuffer(GLuint client_id);
 218
 219   // Removes a buffer info for the given buffer.
 220   void RemoveBuffer(GLuint client_id);
 221
 222   // Gets a client id for a given service id.
 223   bool GetClientId(GLuint service_id, GLuint* client_id) const;
 224
 225   // Validates a glBufferSubData, and then calls DoBufferData if validation was
 226   // successful.
 227   void ValidateAndDoBufferSubData(
 228       ContextState* context_state, GLenum target, GLintptr offset,
 229       GLsizeiptr size, const GLvoid * data);
 230
 231   // Validates a glBufferData, and then calls DoBufferData if validation was
 232   // successful.
 233   void ValidateAndDoBufferData(
 234     ContextState* context_state, GLenum target, GLsizeiptr size,
 235     const GLvoid * data, GLenum usage);
 236
 237   // Validates a glGetBufferParameteriv, and then calls GetBufferParameteriv if
 238   // validation was successful.
 239   void ValidateAndDoGetBufferParameteriv(
 240     ContextState* context_state, GLenum target, GLenum pname, GLint* params);
 241
 242   // Sets the target of a buffer. Returns false if the target can not be set.
 243   bool SetTarget(Buffer* buffer, GLenum target);
 244
 245   void set_allow_buffers_on_multiple_targets(bool allow) {
 246     allow_buffers_on_multiple_targets_ = allow;
 247   }
 248
 249   void set_allow_fixed_attribs(bool allow) {
 250     allow_fixed_attribs_ = allow;
 251   }
 252
 253   size_t mem_represented() const {
 254     return memory_tracker_->GetMemRepresented();
 255   }
 256
 257   // Tells for a given usage if this would be a client side array.
 258   bool IsUsageClientSideArray(GLenum usage);
 259
 260   // Tells whether a buffer that is emulated using client-side arrays should be
 261   // set to a non-zero size.
 262   bool UseNonZeroSizeForClientSideArrayBuffer();
 263
 264   Buffer* GetBufferInfoForTarget(ContextState* state, GLenum target) const;
 265
 266  private:
 267   friend class Buffer;
 268   friend class TestHelper;  // Needs access to DoBufferData.
 269   friend class BufferManagerTestBase;  // Needs access to DoBufferSubData.
 270
 271   void StartTracking(Buffer* buffer);
 272   void StopTracking(Buffer* buffer);
 273
 274   // Does a glBufferSubData and updates the approriate accounting.
 275   // Assumes the values have already been validated.
 276   void DoBufferSubData(
 277       ErrorState* error_state,
 278       Buffer* buffer,
 279       GLenum target,
 280       GLintptr offset,
 281       GLsizeiptr size,
 282       const GLvoid* data);
 283
 284   // Does a glBufferData and updates the approprate accounting. Currently
 285   // Assumes the values have already been validated.
 286   void DoBufferData(
 287       ErrorState* error_state,
 288       Buffer* buffer,
 289       GLenum target,
 290       GLsizeiptr size,
 291       GLenum usage,
 292       const GLvoid* data);
 293
 294   // Sets the size, usage and initial data of a buffer.
 295   // If data is NULL buffer will be initialized to 0 if shadowed.
 296   void SetInfo(Buffer* buffer, GLenum target, GLsizeiptr size, GLenum usage,
 297                const GLvoid* data);
 298
 299   scoped_ptr<MemoryTypeTracker> memory_tracker_;
 300   scoped_refptr<FeatureInfo> feature_info_;
 301
 302   // Info for each buffer in the system.
 303   typedef base::hash_map<GLuint, scoped_refptr<Buffer> > BufferMap;
 304   BufferMap buffers_;
 305
 306   // Whether or not buffers can be bound to multiple targets.
 307   bool allow_buffers_on_multiple_targets_;
 308
 309   // Whether or not allow using GL_FIXED type for vertex attribs.
 310   bool allow_fixed_attribs_;
 311
 312   // Counts the number of Buffer allocated with 'this' as its manager.
 313   // Allows to check no Buffer will outlive this.
 314   unsigned int buffer_count_;
 315
 316   bool have_context_;
 317   bool use_client_side_arrays_for_stream_buffers_;
 318
 319   DISALLOW_COPY_AND_ASSIGN(BufferManager);
 320 };
 321
 322 }  // namespace gles2
 323 }  // namespace gpu
 324
 325 #endif  // GPU_COMMAND_BUFFER_SERVICE_BUFFER_MANAGER_H_