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/android/sys_utils.h"
   8 #include "base/logging.h"
   9 #include "base/memory/ref_counted.h"
  10 #include "base/sys_info.h"
  11 #include "ui/gl/gl_bindings.h"
  12 #include "ui/gl/gl_context_egl.h"
  13 #include "ui/gl/gl_context_osmesa.h"
  14 #include "ui/gl/gl_context_stub.h"
  15 #include "ui/gl/gl_implementation.h"
  16 #include "ui/gl/gl_surface.h"
  17
  18 namespace gfx {
  19
  20 namespace {
  21
  22 // Used to render into an already current context+surface,
  23 // that we do not have ownership of (draw callback).
  24 // TODO(boliu): Make this inherit from GLContextEGL.
  25 class GLNonOwnedContext : public GLContextReal {
  26  public:
  27   GLNonOwnedContext(GLShareGroup* share_group);
  28
  29   // Implement GLContext.
  30   virtual bool Initialize(GLSurface* compatible_surface,
  31                           GpuPreference gpu_preference) OVERRIDE;
  32   virtual void Destroy() OVERRIDE {}
  33   virtual bool MakeCurrent(GLSurface* surface) OVERRIDE;
  34   virtual void ReleaseCurrent(GLSurface* surface) OVERRIDE {}
  35   virtual bool IsCurrent(GLSurface* surface) OVERRIDE { return true; }
  36   virtual void* GetHandle() OVERRIDE { return NULL; }
  37   virtual void SetSwapInterval(int interval) OVERRIDE {}
  38   virtual std::string GetExtensions() OVERRIDE;
  39
  40  protected:
  41   virtual ~GLNonOwnedContext() {}
  42
  43  private:
  44   DISALLOW_COPY_AND_ASSIGN(GLNonOwnedContext);
  45
  46   EGLDisplay display_;
  47 };
  48
  49 GLNonOwnedContext::GLNonOwnedContext(GLShareGroup* share_group)
  50   : GLContextReal(share_group), display_(NULL) {}
  51
  52 bool GLNonOwnedContext::Initialize(GLSurface* compatible_surface,
  53                         GpuPreference gpu_preference) {
  54   display_ = eglGetDisplay(EGL_DEFAULT_DISPLAY);
  55   return true;
  56 }
  57
  58 bool GLNonOwnedContext::MakeCurrent(GLSurface* surface) {
  59   SetCurrent(surface);
  60   SetRealGLApi();
  61   return true;
  62 }
  63
  64 std::string GLNonOwnedContext::GetExtensions() {
  65   const char* extensions = eglQueryString(display_, EGL_EXTENSIONS);
  66   if (!extensions)
  67     return GLContext::GetExtensions();
  68
  69   return GLContext::GetExtensions() + " " + extensions;
  70 }
  71
  72 }  // anonymous namespace
  73
  74 // static
  75 scoped_refptr<GLContext> GLContext::CreateGLContext(
  76     GLShareGroup* share_group,
  77     GLSurface* compatible_surface,
  78     GpuPreference gpu_preference) {
  79   scoped_refptr<GLContext> context;
  80   switch (GetGLImplementation()) {
  81     case kGLImplementationMockGL:
  82       return scoped_refptr<GLContext>(new GLContextStub());
  83     case kGLImplementationOSMesaGL:
  84       context = new GLContextOSMesa(share_group);
  85       break;
  86     default:
  87       if (compatible_surface->GetHandle())
  88         context = new GLContextEGL(share_group);
  89       else
  90         context = new GLNonOwnedContext(share_group);
  91       break;
  92   }
  93
  94   if (!context->Initialize(compatible_surface, gpu_preference))
  95     return NULL;
  96
  97   return context;
  98 }
  99
 100 bool GLContextEGL::GetTotalGpuMemory(size_t* bytes) {
 101   DCHECK(bytes);
 102   *bytes = 0;
 103
 104   // We can't query available GPU memory from the system on Android.
 105   // Physical memory is also mis-reported sometimes (eg. Nexus 10 reports
 106   // 1262MB when it actually has 2GB, while Razr M has 1GB but only reports
 107   // 128MB java heap size). First we estimate physical memory using both.
 108   size_t dalvik_mb = base::SysInfo::DalvikHeapSizeMB();
 109   size_t physical_mb = base::SysInfo::AmountOfPhysicalMemoryMB();
 110   size_t physical_memory_mb = 0;
 111   if (dalvik_mb >= 256)
 112     physical_memory_mb = dalvik_mb * 4;
 113   else
 114     physical_memory_mb = std::max(dalvik_mb * 4,
 115                                   (physical_mb * 4) / 3);
 116
 117   // Now we take a default of 1/8th of memory on high-memory devices,
 118   // and gradually scale that back for low-memory devices (to be nicer
 119   // to other apps so they don't get killed). Examples:
 120   // Nexus 4/10(2GB)    256MB (normally 128MB)
 121   // Droid Razr M(1GB)  114MB (normally 57MB)
 122   // Galaxy Nexus(1GB)  100MB (normally 50MB)
 123   // Xoom(1GB)          100MB (normally 50MB)
 124   // Nexus S(low-end)   12MB (normally 8MB)
 125   // Note that the compositor now uses only some of this memory for
 126   // pre-painting and uses the rest only for 'emergencies'.
 127   static size_t limit_bytes = 0;
 128   if (limit_bytes == 0) {
 129     // NOTE: Non-low-end devices use only 50% of these limits,
 130     // except during 'emergencies' where 100% can be used.
 131     if (!base::android::SysUtils::IsLowEndDevice()) {
 132       if (physical_memory_mb >= 1536)
 133         limit_bytes = physical_memory_mb / 8; // >192MB
 134       else if (physical_memory_mb >= 1152)
 135         limit_bytes = physical_memory_mb / 8; // >144MB
 136       else if (physical_memory_mb >= 768)
 137         limit_bytes = physical_memory_mb / 10; // >76MB
 138       else
 139         limit_bytes = physical_memory_mb / 12; // <64MB
 140     } else {
 141       // Low-end devices have 512MB or less memory by definition
 142       // so we hard code the limit rather than relying on the heuristics
 143       // above. Low-end devices use 4444 textures so we can use a lower limit.
 144       // NOTE: Low-end uses 2/3 (67%) of this memory in practice, so we have
 145       // increased the limit to 12 (8MB, or 12MB in emergencies).
 146       limit_bytes = 12;
 147     }
 148     limit_bytes = limit_bytes * 1024 * 1024;
 149   }
 150   *bytes = limit_bytes;
 151   return true;
 152 }
 153
 154 }