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// Copyright 2014 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "ui/ozone/demo/gl_renderer.h"
#include <memory>
#include <utility>
#include "base/functional/bind.h"
#include "base/location.h"
#include "base/task/single_thread_task_runner.h"
#include "base/trace_event/trace_event.h"
#include "ui/gfx/color_space.h"
#include "ui/gfx/gpu_fence.h"
#include "ui/gl/gl_bindings.h"
#include "ui/gl/gl_context.h"
#include "ui/gl/gl_surface.h"
#include "ui/gl/init/gl_factory.h"
#include "ui/ozone/public/platform_window_surface.h"
namespace ui {
GlRenderer::GlRenderer(gfx::AcceleratedWidget widget,
std::unique_ptr<PlatformWindowSurface> window_surface,
const scoped_refptr<gl::GLSurface>& gl_surface,
const gfx::Size& size)
: RendererBase(widget, size),
window_surface_(std::move(window_surface)),
gl_surface_(gl_surface) {}
GlRenderer::~GlRenderer() {}
bool GlRenderer::Initialize() {
context_ = gl::init::CreateGLContext(nullptr, gl_surface_.get(),
gl::GLContextAttribs());
if (!context_.get()) {
LOG(ERROR) << "Failed to create GL context";
return false;
}
if (!context_->MakeCurrent(gl_surface_.get())) {
LOG(ERROR) << "Failed to make GL context current";
return false;
}
gl_surface_->Resize(size_, 1.f, gfx::ColorSpace(), true);
// Schedule the initial render.
PostRenderFrameTask(gfx::SwapCompletionResult(gfx::SwapResult::SWAP_ACK));
return true;
}
void GlRenderer::RenderFrame() {
TRACE_EVENT0("ozone", "GlRenderer::RenderFrame");
float fraction = NextFraction();
context_->MakeCurrent(gl_surface_.get());
glViewport(0, 0, size_.width(), size_.height());
glClearColor(1.f - fraction, fraction, 0.f, 1.f);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
if (gl_surface_->SupportsAsyncSwap()) {
gl_surface_->SwapBuffersAsync(
base::BindOnce(&GlRenderer::PostRenderFrameTask,
weak_ptr_factory_.GetWeakPtr()),
base::BindOnce(&GlRenderer::OnPresentation,
weak_ptr_factory_.GetWeakPtr()),
gfx::FrameData());
} else {
PostRenderFrameTask(gfx::SwapCompletionResult(
gl_surface_->SwapBuffers(base::BindOnce(&GlRenderer::OnPresentation,
weak_ptr_factory_.GetWeakPtr()),
gfx::FrameData())));
}
}
void GlRenderer::PostRenderFrameTask(gfx::SwapCompletionResult result) {
if (!result.release_fence.is_null())
gfx::GpuFence(std::move(result.release_fence)).Wait();
base::SingleThreadTaskRunner::GetCurrentDefault()->PostTask(
FROM_HERE,
base::BindOnce(&GlRenderer::RenderFrame, weak_ptr_factory_.GetWeakPtr()));
}
void GlRenderer::OnPresentation(const gfx::PresentationFeedback& feedback) {
LOG_IF(ERROR, feedback.timestamp.is_null()) << "Last frame is discarded!";
}
} // namespace ui
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