ui/ozone/demo/gl_renderer.cc

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "ui/ozone/demo/gl_renderer.h"
   6
   7 #include "base/location.h"
   8 #include "base/thread_task_runner_handle.h"
   9 #include "base/trace_event/trace_event.h"
  10 #include "ui/gl/gl_bindings.h"
  11 #include "ui/gl/gl_context.h"
  12 #include "ui/gl/gl_surface.h"
  13
  14 namespace ui {
  15
  16 GlRenderer::GlRenderer(gfx::AcceleratedWidget widget,
  17                        const scoped_refptr<gfx::GLSurface>& surface,
  18                        const gfx::Size& size)
  19     : RendererBase(widget, size), surface_(surface), weak_ptr_factory_(this) {}
  20
  21 GlRenderer::~GlRenderer() {
  22 }
  23
  24 bool GlRenderer::Initialize() {
  25   context_ = gfx::GLContext::CreateGLContext(NULL, surface_.get(),
  26                                              gfx::PreferIntegratedGpu);
  27   if (!context_.get()) {
  28     LOG(ERROR) << "Failed to create GL context";
  29     return false;
  30   }
  31
  32   surface_->Resize(size_);
  33
  34   if (!context_->MakeCurrent(surface_.get())) {
  35     LOG(ERROR) << "Failed to make GL context current";
  36     return false;
  37   }
  38
  39   PostRenderFrameTask(gfx::SwapResult::SWAP_ACK);
  40   return true;
  41 }
  42
  43 void GlRenderer::RenderFrame() {
  44   TRACE_EVENT0("ozone", "GlRenderer::RenderFrame");
  45
  46   float fraction = NextFraction();
  47
  48   context_->MakeCurrent(surface_.get());
  49
  50   glViewport(0, 0, size_.width(), size_.height());
  51   glClearColor(1 - fraction, fraction, 0.0, 1.0);
  52   glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
  53
  54   if (!surface_->SwapBuffersAsync(base::Bind(&GlRenderer::PostRenderFrameTask,
  55                                              weak_ptr_factory_.GetWeakPtr())))
  56     LOG(FATAL) << "Failed to swap buffers";
  57 }
  58
  59 void GlRenderer::PostRenderFrameTask(gfx::SwapResult result) {
  60   base::ThreadTaskRunnerHandle::Get()->PostTask(
  61       FROM_HERE,
  62       base::Bind(&GlRenderer::RenderFrame, weak_ptr_factory_.GetWeakPtr()));
  63 }
  64
  65 }  // namespace ui