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// Copyright (c) 2013 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 "content/common/gpu/client/grcontext_for_webgraphicscontext3d.h"
#include <stddef.h>
#include <string.h>
#include <utility>
#include "base/lazy_instance.h"
#include "base/macros.h"
#include "base/trace_event/trace_event.h"
#include "gpu/blink/webgraphicscontext3d_impl.h"
#include "gpu/command_buffer/client/gles2_lib.h"
#include "gpu/skia_bindings/gl_bindings_skia_cmd_buffer.h"
#include "third_party/skia/include/gpu/GrContext.h"
using gpu_blink::WebGraphicsContext3DImpl;
namespace content {
namespace {
// Singleton used to initialize and terminate the gles2 library.
class GLES2Initializer {
public:
GLES2Initializer() { gles2::Initialize(); }
~GLES2Initializer() { gles2::Terminate(); }
private:
DISALLOW_COPY_AND_ASSIGN(GLES2Initializer);
};
base::LazyInstance<GLES2Initializer> g_gles2_initializer =
LAZY_INSTANCE_INITIALIZER;
void BindWebGraphicsContext3DGLContextCallback(const GrGLInterface* interface) {
gles2::SetGLContext(static_cast<const GrGLInterfaceForWebGraphicsContext3D*>(
interface)->WebContext3D()->GetGLInterface());
}
} // namespace anonymous
GrContextForWebGraphicsContext3D::GrContextForWebGraphicsContext3D(
skia::RefPtr<GrGLInterfaceForWebGraphicsContext3D> gr_interface) {
if (!gr_interface || !gr_interface->WebContext3D())
return;
// Ensure the gles2 library is initialized first in a thread safe way.
g_gles2_initializer.Get();
gles2::SetGLContext(gr_interface->WebContext3D()->GetGLInterface());
skia_bindings::InitCommandBufferSkiaGLBinding(gr_interface.get());
gr_interface->fCallback = BindWebGraphicsContext3DGLContextCallback;
gr_context_ = skia::AdoptRef(GrContext::Create(
kOpenGL_GrBackend,
reinterpret_cast<GrBackendContext>(gr_interface.get())));
if (gr_context_) {
// The limit of the number of GPU resources we hold in the GrContext's
// GPU cache.
static const int kMaxGaneshResourceCacheCount = 2048;
// The limit of the bytes allocated toward GPU resources in the GrContext's
// GPU cache.
static const size_t kMaxGaneshResourceCacheBytes = 96 * 1024 * 1024;
gr_context_->setResourceCacheLimits(kMaxGaneshResourceCacheCount,
kMaxGaneshResourceCacheBytes);
}
}
GrContextForWebGraphicsContext3D::~GrContextForWebGraphicsContext3D() {
}
void GrContextForWebGraphicsContext3D::OnLostContext() {
if (gr_context_)
gr_context_->abandonContext();
}
void GrContextForWebGraphicsContext3D::FreeGpuResources() {
if (gr_context_) {
TRACE_EVENT_INSTANT0("gpu", "GrContext::freeGpuResources", \
TRACE_EVENT_SCOPE_THREAD);
gr_context_->freeGpuResources();
}
}
GrGLInterfaceForWebGraphicsContext3D::GrGLInterfaceForWebGraphicsContext3D(
scoped_ptr<gpu_blink::WebGraphicsContext3DImpl> context3d)
: context3d_(std::move(context3d)) {}
void GrGLInterfaceForWebGraphicsContext3D::BindToCurrentThread() {
context_thread_checker_.DetachFromThread();
}
GrGLInterfaceForWebGraphicsContext3D::~GrGLInterfaceForWebGraphicsContext3D() {
DCHECK(context_thread_checker_.CalledOnValidThread());
#if !defined(NDEBUG)
// Set all the function pointers to zero, in order to crash if function
// pointers are used after free.
memset(&fFunctions, 0, sizeof(GrGLInterface::Functions));
#endif
}
} // namespace content
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