Ozone integration.

ui/ozone/demo/surfaceless_gl_renderer.cc

+// Copyright 2014 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/ozone/demo/surfaceless_gl_renderer.h"
+
+#include "base/bind.h"
+#include "ui/gl/gl_bindings.h"
+#include "ui/gl/gl_context.h"
+#include "ui/gl/gl_image.h"
+#include "ui/gl/gl_surface.h"
+#include "ui/ozone/gpu/gpu_memory_buffer_factory_ozone_native_buffer.h"
+
+namespace ui {
+
+SurfacelessGlRenderer::BufferWrapper::BufferWrapper() {
+}
+
+SurfacelessGlRenderer::BufferWrapper::~BufferWrapper() {
+  if (gl_fb_)
+    glDeleteFramebuffersEXT(1, &gl_fb_);
+
+  if (gl_tex_) {
+    image_->ReleaseTexImage(GL_TEXTURE_2D);
+    glDeleteTextures(1, &gl_tex_);
+    image_->Destroy(true);
+  }
+}
+
+bool SurfacelessGlRenderer::BufferWrapper::Initialize(
+    GpuMemoryBufferFactoryOzoneNativeBuffer* buffer_factory,
+    gfx::AcceleratedWidget widget,
+    const gfx::Size& size) {
+  glGenFramebuffersEXT(1, &gl_fb_);
+  glGenTextures(1, &gl_tex_);
+
+  static int buffer_id_generator = 1;
+  int id = buffer_id_generator++;
+
+  buffer_factory->CreateGpuMemoryBuffer(
+      id, size, gfx::GpuMemoryBuffer::RGBX_8888, gfx::GpuMemoryBuffer::SCANOUT,
+      1, widget);
+  image_ = buffer_factory->CreateImageForGpuMemoryBuffer(
+      id, size, gfx::GpuMemoryBuffer::RGBX_8888, GL_RGB, 1);
+  // Now that we have a reference to |image_|; we can just remove it from the
+  // factory mapping.
+  buffer_factory->DestroyGpuMemoryBuffer(id, widget);
+
+  if (!image_) {
+    LOG(ERROR) << "Failed to create GL image";
+    return false;
+  }
+
+  glBindFramebufferEXT(GL_FRAMEBUFFER, gl_fb_);
+  glBindTexture(GL_TEXTURE_2D, gl_tex_);
+  image_->BindTexImage(GL_TEXTURE_2D);
+
+  glFramebufferTexture2DEXT(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D,
+                            gl_tex_, 0);
+  if (glCheckFramebufferStatusEXT(GL_FRAMEBUFFER) != GL_FRAMEBUFFER_COMPLETE) {
+    LOG(ERROR) << "Failed to create framebuffer "
+               << glCheckFramebufferStatusEXT(GL_FRAMEBUFFER);
+    return false;
+  }
+
+  widget_ = widget;
+  size_ = size;
+
+  return true;
+}
+
+void SurfacelessGlRenderer::BufferWrapper::BindFramebuffer() {
+  glBindFramebufferEXT(GL_FRAMEBUFFER, gl_fb_);
+}
+
+void SurfacelessGlRenderer::BufferWrapper::SchedulePlane() {
+  image_->ScheduleOverlayPlane(widget_, 0, gfx::OVERLAY_TRANSFORM_NONE,
+                               gfx::Rect(size_), gfx::RectF(0, 0, 1, 1));
+}
+
+SurfacelessGlRenderer::SurfacelessGlRenderer(
+    gfx::AcceleratedWidget widget,
+    const gfx::Size& size,
+    GpuMemoryBufferFactoryOzoneNativeBuffer* buffer_factory)
+    : GlRenderer(widget, size),
+      buffer_factory_(buffer_factory),
+      weak_ptr_factory_(this) {
+}
+
+SurfacelessGlRenderer::~SurfacelessGlRenderer() {
+  // Need to make current when deleting the framebuffer resources allocated in
+  // the buffers.
+  context_->MakeCurrent(surface_.get());
+}
+
+bool SurfacelessGlRenderer::Initialize() {
+  if (!GlRenderer::Initialize())
+    return false;
+
+  for (size_t i = 0; i < arraysize(buffers_); ++i)
+    if (!buffers_[i].Initialize(buffer_factory_, widget_, size_))
+      return false;
+
+  PostRenderFrameTask(gfx::SwapResult::SWAP_ACK);
+  return true;
+}
+
+void SurfacelessGlRenderer::RenderFrame() {
+  float fraction = NextFraction();
+
+  context_->MakeCurrent(surface_.get());
+  buffers_[back_buffer_].BindFramebuffer();
+
+  glViewport(0, 0, size_.width(), size_.height());
+  glClearColor(1 - fraction, fraction, 0.0, 1.0);
+  glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+
+  buffers_[back_buffer_].SchedulePlane();
+  back_buffer_ ^= 1;
+  if (!surface_->SwapBuffersAsync(base::Bind(&GlRenderer::PostRenderFrameTask,
+                                             weak_ptr_factory_.GetWeakPtr())))
+    LOG(FATAL) << "Failed to swap buffers";
+}
+
+scoped_refptr<gfx::GLSurface> SurfacelessGlRenderer::CreateSurface() {
+  gfx::SurfaceConfiguration config;
+  return gfx::GLSurface::CreateSurfacelessViewGLSurface(widget_, config);
+}
+
+}  // namespace ui