ui/gl/gl_context_android.cc

   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 #include "ui/gl/gl_context.h"
   6
   7 #include "base/logging.h"
   8 #include "base/memory/ref_counted.h"
   9 #include "base/sys_info.h"
  10 #include "ui/gl/gl_bindings.h"
  11 #include "ui/gl/gl_context_egl.h"
  12 #include "ui/gl/gl_context_osmesa.h"
  13 #include "ui/gl/gl_context_stub.h"
  14 #include "ui/gl/gl_implementation.h"
  15 #include "ui/gl/gl_surface.h"
  16
  17 namespace gfx {
  18
  19 namespace {
  20
  21 // Used to render into an already current context+surface,
  22 // that we do not have ownership of (draw callback).
  23 // TODO(boliu): Make this inherit from GLContextEGL.
  24 class GLNonOwnedContext : public GLContextReal {
  25  public:
  26   GLNonOwnedContext(GLShareGroup* share_group);
  27
  28   // Implement GLContext.
  29   virtual bool Initialize(GLSurface* compatible_surface,
  30                           GpuPreference gpu_preference) OVERRIDE;
  31   virtual void Destroy() OVERRIDE {}
  32   virtual bool MakeCurrent(GLSurface* surface) OVERRIDE;
  33   virtual void ReleaseCurrent(GLSurface* surface) OVERRIDE {}
  34   virtual bool IsCurrent(GLSurface* surface) OVERRIDE { return true; }
  35   virtual void* GetHandle() OVERRIDE { return NULL; }
  36   virtual void SetSwapInterval(int interval) OVERRIDE {}
  37   virtual std::string GetExtensions() OVERRIDE;
  38
  39  protected:
  40   virtual ~GLNonOwnedContext() {}
  41
  42  private:
  43   DISALLOW_COPY_AND_ASSIGN(GLNonOwnedContext);
  44
  45   EGLDisplay display_;
  46 };
  47
  48 GLNonOwnedContext::GLNonOwnedContext(GLShareGroup* share_group)
  49   : GLContextReal(share_group), display_(NULL) {}
  50
  51 bool GLNonOwnedContext::Initialize(GLSurface* compatible_surface,
  52                         GpuPreference gpu_preference) {
  53   display_ = eglGetDisplay(EGL_DEFAULT_DISPLAY);
  54   return true;
  55 }
  56
  57 bool GLNonOwnedContext::MakeCurrent(GLSurface* surface) {
  58   SetCurrent(surface);
  59   SetRealGLApi();
  60   return true;
  61 }
  62
  63 std::string GLNonOwnedContext::GetExtensions() {
  64   const char* extensions = eglQueryString(display_, EGL_EXTENSIONS);
  65   if (!extensions)
  66     return GLContext::GetExtensions();
  67
  68   return GLContext::GetExtensions() + " " + extensions;
  69 }
  70
  71 }  // anonymous namespace
  72
  73 // static
  74 scoped_refptr<GLContext> GLContext::CreateGLContext(
  75     GLShareGroup* share_group,
  76     GLSurface* compatible_surface,
  77     GpuPreference gpu_preference) {
  78   scoped_refptr<GLContext> context;
  79   switch (GetGLImplementation()) {
  80     case kGLImplementationMockGL:
  81       return scoped_refptr<GLContext>(new GLContextStub());
  82     case kGLImplementationOSMesaGL:
  83       context = new GLContextOSMesa(share_group);
  84       break;
  85     default:
  86       if (compatible_surface->GetHandle())
  87         context = new GLContextEGL(share_group);
  88       else
  89         context = new GLNonOwnedContext(share_group);
  90       break;
  91   }
  92
  93   if (!context->Initialize(compatible_surface, gpu_preference))
  94     return NULL;
  95
  96   return context;
  97 }
  98
  99 bool GLContextEGL::GetTotalGpuMemory(size_t* bytes) {
 100   DCHECK(bytes);
 101   *bytes = 0;
 102
 103   // We can't query available GPU memory from the system on Android.
 104   // Physical memory is also mis-reported sometimes (eg. Nexus 10 reports
 105   // 1262MB when it actually has 2GB, while Razr M has 1GB but only reports
 106   // 128MB java heap size). First we estimate physical memory using both.
 107   size_t dalvik_mb = base::SysInfo::DalvikHeapSizeMB();
 108   size_t physical_mb = base::SysInfo::AmountOfPhysicalMemoryMB();
 109   size_t physical_memory_mb = 0;
 110   if (dalvik_mb >= 256)
 111     physical_memory_mb = dalvik_mb * 4;
 112   else
 113     physical_memory_mb = std::max(dalvik_mb * 4,
 114                                   (physical_mb * 4) / 3);
 115
 116   // Now we take a default of 1/8th of memory on high-memory devices,
 117   // and gradually scale that back for low-memory devices (to be nicer
 118   // to other apps so they don't get killed). Examples:
 119   // Nexus 4/10(2GB)    256MB (normally 128MB)
 120   // Droid Razr M(1GB)  114MB (normally 57MB)
 121   // Galaxy Nexus(1GB)  100MB (normally 50MB)
 122   // Xoom(1GB)          100MB (normally 50MB)
 123   // Nexus S(low-end)   12MB (normally 8MB)
 124   // Note that the compositor now uses only some of this memory for
 125   // pre-painting and uses the rest only for 'emergencies'.
 126   static size_t limit_bytes = 0;
 127   if (limit_bytes == 0) {
 128     // NOTE: Non-low-end devices use only 50% of these limits,
 129     // except during 'emergencies' where 100% can be used.
 130     if (!base::SysInfo::IsLowEndDevice()) {
 131       if (physical_memory_mb >= 1536)
 132         limit_bytes = physical_memory_mb / 8; // >192MB
 133       else if (physical_memory_mb >= 1152)
 134         limit_bytes = physical_memory_mb / 8; // >144MB
 135       else if (physical_memory_mb >= 768)
 136         limit_bytes = physical_memory_mb / 10; // >76MB
 137       else
 138         limit_bytes = physical_memory_mb / 12; // <64MB
 139     } else {
 140       // Low-end devices have 512MB or less memory by definition
 141       // so we hard code the limit rather than relying on the heuristics
 142       // above. Low-end devices use 4444 textures so we can use a lower limit.
 143       // NOTE: Low-end uses 2/3 (67%) of this memory in practice, so we have
 144       // increased the limit to 12 (8MB, or 12MB in emergencies).
 145       limit_bytes = 12;
 146     }
 147     limit_bytes = limit_bytes * 1024 * 1024;
 148   }
 149   *bytes = limit_bytes;
 150   return true;
 151 }
 152
 153 }