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// Copyright 2018 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chrome/browser/vr/graphics_delegate_win.h"
#include "components/viz/common/resources/shared_image_format_utils.h"
#include "content/public/browser/gpu_utils.h"
#include "content/public/common/gpu_stream_constants.h"
#include "device/vr/public/mojom/vr_service.mojom.h"
#include "gpu/command_buffer/client/client_shared_image.h"
#include "gpu/command_buffer/client/gles2_interface.h"
#include "gpu/command_buffer/client/gles2_lib.h"
#include "gpu/command_buffer/client/shared_image_interface.h"
#include "gpu/command_buffer/common/context_creation_attribs.h"
#include "gpu/command_buffer/common/shared_image_usage.h"
#include "mojo/public/cpp/bindings/sync_call_restrictions.h"
namespace vr {
GraphicsDelegateWin::GraphicsDelegateWin() = default;
GraphicsDelegateWin::~GraphicsDelegateWin() = default;
void GraphicsDelegateWin::Initialize(base::OnceClosure on_initialized) {
gpu::GpuChannelEstablishFactory* factory =
content::GetGpuChannelEstablishFactory();
gpu_channel_host_ = factory->EstablishGpuChannelSync();
gpu::ContextCreationAttribs attributes;
attributes.bind_generates_resource = false;
context_provider_ = base::MakeRefCounted<viz::ContextProviderCommandBuffer>(
gpu_channel_host_, content::kGpuStreamIdDefault,
content::kGpuStreamPriorityUI, GURL(std::string("chrome://gpu/VrUiWin")),
false /* automatic flushes */, false /* support locking */,
gpu::SharedMemoryLimits::ForMailboxContext(), attributes,
viz::command_buffer_metrics::ContextType::XR_COMPOSITING);
if (context_provider_->BindToCurrentSequence() ==
gpu::ContextResult::kSuccess) {
gl_ = context_provider_->ContextGL();
sii_ = context_provider_->SharedImageInterface();
}
std::move(on_initialized).Run();
}
bool GraphicsDelegateWin::BindContext() {
if (!gl_)
return false;
gles2::SetGLContext(gl_);
return true;
}
void GraphicsDelegateWin::ClearContext() {
gles2::SetGLContext(nullptr);
}
bool GraphicsDelegateWin::PreRender() {
if (!gl_)
return false;
BindContext();
// Create a memory buffer and a shared image referencing that memory buffer.
if (!EnsureMemoryBuffer()) {
return false;
}
// Create a texture id and associate it with shared image.
shared_image_texture_ = client_shared_image_->CreateGLTexture(gl_);
scoped_shared_image_access_ =
shared_image_texture_->BeginAccess(gpu::SyncToken(), /*readonly=*/false);
gl_->BindTexture(GL_TEXTURE_2D, scoped_shared_image_access_->texture_id());
gl_->TexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
gl_->TexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
gl_->TexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
gl_->TexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
gl_->BindTexture(GL_TEXTURE_2D, 0);
// Bind our image/texture/memory buffer as the draw framebuffer.
gl_->GenFramebuffers(1, &draw_frame_buffer_);
gl_->BindFramebuffer(GL_DRAW_FRAMEBUFFER, draw_frame_buffer_);
gl_->FramebufferTexture2D(GL_DRAW_FRAMEBUFFER, GL_COLOR_ATTACHMENT0,
GL_TEXTURE_2D,
scoped_shared_image_access_->texture_id(), 0);
if (gl_->GetError() != GL_NO_ERROR) {
gpu::SharedImageTexture::ScopedAccess::EndAccess(
std::move(scoped_shared_image_access_));
shared_image_texture_.reset();
// Clear any remaining GL errors.
while (gl_->GetError() != GL_NO_ERROR) {
}
return false;
}
return true;
}
void GraphicsDelegateWin::PostRender() {
// Unbind the drawing buffer.
gl_->BindFramebuffer(GL_FRAMEBUFFER, 0);
gl_->DeleteFramebuffers(1, &draw_frame_buffer_);
// Generate a SyncToken after GPU is done accessing the texture.
access_done_sync_token_ = gpu::SharedImageTexture::ScopedAccess::EndAccess(
std::move(scoped_shared_image_access_));
sii_->VerifySyncToken(access_done_sync_token_);
shared_image_texture_.reset();
gl_->BindTexture(GL_TEXTURE_2D, 0);
draw_frame_buffer_ = 0;
// Flush.
gl_->ShallowFlushCHROMIUM();
ClearContext();
}
gfx::GpuMemoryBufferHandle GraphicsDelegateWin::GetTexture() {
if (!client_shared_image_) {
return gfx::GpuMemoryBufferHandle();
}
return client_shared_image_->CloneGpuMemoryBufferHandle();
}
gpu::SyncToken GraphicsDelegateWin::GetSyncToken() {
return access_done_sync_token_;
}
bool GraphicsDelegateWin::EnsureMemoryBuffer() {
gfx::Size buffer_size = GetTextureSize();
if (client_shared_image_ && last_size_ == buffer_size) {
return true;
}
// Destroy any existing SharedImage as its size is not correct.
ResetMemoryBuffer();
last_size_ = buffer_size;
viz::SharedImageFormat format = viz::SinglePlaneFormat::kRGBA_8888;
// These SharedImages will be written to via GLES2 to render the scene,
// followed by having their underlying GMBHandle sent off to be displayed in
// an overlay.
client_shared_image_ = sii_->CreateSharedImage(
{format, buffer_size, gfx::ColorSpace(),
gpu::SHARED_IMAGE_USAGE_GLES2_WRITE, "VRGraphicsDelegate"},
gpu::kNullSurfaceHandle, gfx::BufferUsage::SCANOUT);
if (!client_shared_image_) {
return false;
}
return true;
}
void GraphicsDelegateWin::ResetMemoryBuffer() {
if (client_shared_image_) {
sii_->DestroySharedImage(access_done_sync_token_,
std::move(client_shared_image_));
}
access_done_sync_token_.Clear();
}
void GraphicsDelegateWin::ClearBufferToBlack() {
gl_->ClearColor(0, 0, 0, 0);
gl_->Clear(GL_COLOR_BUFFER_BIT);
}
} // namespace vr
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