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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/android/sys_utils.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 {
namespace {
// Used to render into an already current context+surface,
// that we do not have ownership of (draw callback).
class GLNonOwnedContext : public GLContextReal {
public:
GLNonOwnedContext(GLShareGroup* share_group);
// Implement GLContext.
virtual bool Initialize(GLSurface* compatible_surface,
GpuPreference gpu_preference) OVERRIDE {
return true;
}
virtual void Destroy() OVERRIDE {}
virtual bool MakeCurrent(GLSurface* surface) OVERRIDE;
virtual void ReleaseCurrent(GLSurface* surface) OVERRIDE {}
virtual bool IsCurrent(GLSurface* surface) OVERRIDE { return true; }
virtual void* GetHandle() OVERRIDE { return NULL; }
virtual void SetSwapInterval(int interval) OVERRIDE {}
virtual std::string GetExtensions() OVERRIDE;
protected:
virtual ~GLNonOwnedContext() {}
private:
DISALLOW_COPY_AND_ASSIGN(GLNonOwnedContext);
};
GLNonOwnedContext::GLNonOwnedContext(GLShareGroup* share_group)
: GLContextReal(share_group) {}
bool GLNonOwnedContext::MakeCurrent(GLSurface* surface) {
SetCurrent(surface);
SetRealGLApi();
return true;
}
std::string GLNonOwnedContext::GetExtensions() {
return GLContext::GetExtensions();
}
} // anonymous namespace
// 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 GLNonOwnedContext(share_group);
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.
// Physical memory is also mis-reported sometimes (eg. Nexus 10 reports
// 1262MB when it actually has 2GB, while Razr M has 1GB but only reports
// 128MB java heap size). First we estimate physical memory using both.
size_t dalvik_mb = base::SysInfo::DalvikHeapSizeMB();
size_t physical_mb = base::SysInfo::AmountOfPhysicalMemoryMB();
size_t physical_memory_mb = 0;
if (dalvik_mb >= 256)
physical_memory_mb = dalvik_mb * 4;
else
physical_memory_mb = std::max(dalvik_mb * 4,
(physical_mb * 4) / 3);
// Now we take a default of 1/8th of memory on high-memory devices,
// and gradually scale that back for low-memory devices (to be nicer
// to other apps so they don't get killed). Examples:
// Nexus 4/10(2GB) 256MB
// Droid Razr M(1GB) 91MB
// Galaxy Nexus(1GB) 85MB
// Xoom(1GB) 85MB
// Nexus S(low-end) 16MB
static size_t limit_bytes = 0;
if (limit_bytes == 0) {
if (!base::android::SysUtils::IsLowEndDevice()) {
if (physical_memory_mb >= 1536)
limit_bytes = physical_memory_mb / 8;
else if (physical_memory_mb >= 1152)
limit_bytes = physical_memory_mb / 10;
else if (physical_memory_mb >= 768)
limit_bytes = physical_memory_mb / 12;
else
limit_bytes = physical_memory_mb / 16;
} else {
limit_bytes = physical_memory_mb / 32;
}
limit_bytes = limit_bytes * 1024 * 1024;
}
*bytes = limit_bytes;
return true;
}
}
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