gpu/command_buffer/common/gpu_memory_allocation.h

   1 // Copyright 2013 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_COMMON_GPU_MEMORY_ALLOCATION_H_
   6 #define GPU_COMMAND_BUFFER_COMMON_GPU_MEMORY_ALLOCATION_H_
   7
   8 #include "base/basictypes.h"
   9
  10 namespace gpu {
  11
  12 // These are per context memory allocation limits set by the GpuMemoryManager
  13 // and assigned to the browser and renderer context.
  14 // They will change over time, given memory availability, and browser state.
  15 struct MemoryAllocation {
  16   enum PriorityCutoff {
  17     // Allow no allocations.
  18     CUTOFF_ALLOW_NOTHING,
  19     // Allow only allocations that are strictly required for correct rendering.
  20     // For compositors, this is what is visible.
  21     CUTOFF_ALLOW_REQUIRED_ONLY,
  22     // Allow allocations that are not strictly needed for correct rendering, but
  23     // are nice to have for performance. For compositors, this includes textures
  24     // that are a few screens away from being visible.
  25     CUTOFF_ALLOW_NICE_TO_HAVE,
  26     // Allow all allocations.
  27     CUTOFF_ALLOW_EVERYTHING,
  28     CUTOFF_LAST = CUTOFF_ALLOW_EVERYTHING
  29   };
  30
  31   // Limits when this renderer is visible.
  32   uint64 bytes_limit_when_visible;
  33   PriorityCutoff priority_cutoff_when_visible;
  34
  35   MemoryAllocation()
  36       : bytes_limit_when_visible(0),
  37         priority_cutoff_when_visible(CUTOFF_ALLOW_NOTHING) {
  38   }
  39
  40   MemoryAllocation(uint64 bytes_limit_when_visible)
  41       : bytes_limit_when_visible(bytes_limit_when_visible),
  42         priority_cutoff_when_visible(CUTOFF_ALLOW_EVERYTHING) {
  43   }
  44
  45   bool Equals(const MemoryAllocation& other) const {
  46     return bytes_limit_when_visible ==
  47                other.bytes_limit_when_visible &&
  48         priority_cutoff_when_visible == other.priority_cutoff_when_visible;
  49   }
  50 };
  51
  52 // Memory Allocation request which is sent by a client, to help GpuMemoryManager
  53 // more ideally split memory allocations across clients.
  54 struct ManagedMemoryStats {
  55   // Bytes required for correct rendering.
  56   uint64 bytes_required;
  57
  58   // Bytes that are not strictly required for correctness, but, if allocated,
  59   // will provide good performance.
  60   uint64 bytes_nice_to_have;
  61
  62   // The number of bytes currently allocated.
  63   uint64 bytes_allocated;
  64
  65   // Whether or not a backbuffer is currently requested (the memory usage
  66   // of the buffer is known by the GPU process).
  67   bool backbuffer_requested;
  68
  69   ManagedMemoryStats()
  70       : bytes_required(0),
  71         bytes_nice_to_have(0),
  72         bytes_allocated(0),
  73         backbuffer_requested(false) {
  74   }
  75
  76   ManagedMemoryStats(uint64 bytes_required,
  77                         uint64 bytes_nice_to_have,
  78                         uint64 bytes_allocated,
  79                         bool backbuffer_requested)
  80       : bytes_required(bytes_required),
  81         bytes_nice_to_have(bytes_nice_to_have),
  82         bytes_allocated(bytes_allocated),
  83         backbuffer_requested(backbuffer_requested) {
  84   }
  85
  86   bool Equals(const ManagedMemoryStats& other) const {
  87     return bytes_required == other.bytes_required &&
  88         bytes_nice_to_have == other.bytes_nice_to_have &&
  89         bytes_allocated == other.bytes_allocated &&
  90         backbuffer_requested == other.backbuffer_requested;
  91   }
  92 };
  93
  94 }  // namespace content
  95
  96 #endif // GPU_COMMAND_BUFFER_COMMON_GPU_MEMORY_ALLOCATION_H_