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// Copyright (c) 2012 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.
#include "ui/gl/gl_context.h"
#include "base/logging.h"
#include "base/memory/ref_counted.h"
#include "base/sys_info.h"
#include "ui/gl/gl_bindings.h"
#include "ui/gl/gl_context_egl.h"
#include "ui/gl/gl_context_stub.h"
#include "ui/gl/gl_implementation.h"
#include "ui/gl/gl_surface.h"
namespace gfx {
// static
scoped_refptr<GLContext> GLContext::CreateGLContext(
GLShareGroup* share_group,
GLSurface* compatible_surface,
GpuPreference gpu_preference) {
if (GetGLImplementation() == kGLImplementationMockGL)
return scoped_refptr<GLContext>(new GLContextStub());
scoped_refptr<GLContext> context;
if (compatible_surface->GetHandle())
context = new GLContextEGL(share_group);
else
context = new GLContextStub();
if (!context->Initialize(compatible_surface, gpu_preference))
return NULL;
return context;
}
bool GLContextEGL::GetTotalGpuMemory(size_t* bytes) {
DCHECK(bytes);
*bytes = 0;
// We can't query available GPU memory from the system on Android,
// but the dalvik heap size give us a good estimate of available
// GPU memory on a wide range of devices.
//
// The heap size tends to be about 1/4 of total ram on higher end
// devices, so we use 1/2 of that by default. For example both the
// Nexus 4/10 have 2GB of ram and 512MB Dalvik heap size. For lower
// end devices, 1/2 of the heap size can be too high, but this
// correlates well with having a small heap-growth-limit. So for
// devices with less ram, we factor in the growth limit.
//
// This is the result of the calculation below:
// Droid DNA 1080P 128MB
// Nexus S 56MB
// Galaxy Nexus 112MB
// Nexus 4/10 256MB
// Xoom 88MB
size_t dalvik_limit = 0;
if (!dalvik_limit) {
size_t heap_size = static_cast<size_t>(base::SysInfo::DalvikHeapSizeMB());
// TODO(epenner): Use real heap-growth-limit when it is available.
size_t heap_growth = (heap_size / 2);
size_t limit = 0;
if (heap_size >= 350)
limit = heap_size / 2;
else
limit = (heap_size + (heap_growth * 2)) / 4;
dalvik_limit = limit * 1024 * 1024;
}
*bytes = dalvik_limit;
return true;
}
}
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