Implement media::VideoDecodeAccelerator on Mac

content/common/gpu/media/rendering_helper_egl.cc

+// Copyright (c) 2012 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/media/rendering_helper.h"
+
+#include <map>
+
+#include "base/bind.h"
+#include "base/mac/scoped_nsautorelease_pool.h"
+#include "base/message_loop.h"
+#include "base/stringize_macros.h"
+#include "base/synchronization/waitable_event.h"
+#include "third_party/angle/include/EGL/egl.h"
+
+#if defined(OS_WIN)
+#include "ui/gl/gl_bindings.h"
+#include "ui/gl/gl_context.h"
+#include "ui/gl/gl_implementation.h"
+#include "ui/gl/gl_surface.h"
+#else  // OS_WIN
+#include "third_party/angle/include/GLES2/gl2.h"
+#endif  // OS_WIN
+
+// Helper for Shader creation.
+static void CreateShader(GLuint program,
+                         GLenum type,
+                         const char* source,
+                         int size) {
+  GLuint shader = glCreateShader(type);
+  glShaderSource(shader, 1, &source, &size);
+  glCompileShader(shader);
+  int result = GL_FALSE;
+  glGetShaderiv(shader, GL_COMPILE_STATUS, &result);
+  if (!result) {
+    char log[4096];
+    glGetShaderInfoLog(shader, arraysize(log), NULL, log);
+    LOG(FATAL) << log;
+  }
+  glAttachShader(program, shader);
+  glDeleteShader(shader);
+  CHECK_EQ(static_cast<int>(glGetError()), GL_NO_ERROR);
+}
+
+namespace video_test_util {
+
+class RenderingHelperEGL : public RenderingHelper {
+ public:
+  RenderingHelperEGL();
+  virtual ~RenderingHelperEGL();
+
+  // Implement RenderingHelper.
+  virtual void Initialize(bool suppress_swap_to_display,
+                          int num_windows,
+                          int width,
+                          int height,
+                          base::WaitableEvent* done) OVERRIDE;
+  virtual void UnInitialize(base::WaitableEvent* done) OVERRIDE;
+  virtual void CreateTexture(int window_id,
+                             uint32* texture_id,
+                             base::WaitableEvent* done) OVERRIDE;
+  virtual void RenderTexture(uint32 texture_id) OVERRIDE;
+  virtual void DeleteTexture(uint32 texture_id) OVERRIDE;
+  virtual void* GetGLContext() OVERRIDE;
+  virtual void* GetGLDisplay() OVERRIDE;
+
+ private:
+  void Clear();
+
+  // Platform specific Init/Uninit.
+  void PlatformInitialize();
+  void PlatformUnInitialize();
+
+  // Platform specific window creation.
+  EGLNativeWindowType PlatformCreateWindow(int top_left_x, int top_left_y);
+
+  // Platform specific display surface returned here.
+  EGLDisplay PlatformGetDisplay();
+
+  MessageLoop* message_loop_;
+  int width_;
+  int height_;
+  bool suppress_swap_to_display_;
+
+  EGLDisplay egl_display_;
+  EGLContext egl_context_;
+  std::vector<EGLSurface> egl_surfaces_;
+  std::map<uint32, int> texture_id_to_surface_index_;
+
+#if defined(OS_WIN)
+  std::vector<HWND> windows_;
+#else  // OS_WIN
+  Display* x_display_;
+  std::vector<Window> x_windows_;
+#endif  // OS_WIN
+};
+
+// static
+RenderingHelper* RenderingHelper::Create() {
+  return new RenderingHelperEGL;
+}
+
+// static
+void RenderingHelper::InitializePlatform() {
+#if defined(OS_WIN)
+  gfx::InitializeGLBindings(gfx::kGLImplementationEGLGLES2);
+  gfx::GLSurface::InitializeOneOff();
+  {
+    // Hack to ensure that EGL extension function pointers are initialized.
+    scoped_refptr<gfx::GLSurface> surface(
+        gfx::GLSurface::CreateOffscreenGLSurface(false, gfx::Size(1, 1)));
+    scoped_refptr<gfx::GLContext> context(
+        gfx::GLContext::CreateGLContext(NULL, surface.get(),
+                                        gfx::PreferIntegratedGpu));
+    context->MakeCurrent(surface.get());
+  }
+#endif  // OS_WIN
+}
+
+RenderingHelperEGL::RenderingHelperEGL() {
+  Clear();
+}
+
+RenderingHelperEGL::~RenderingHelperEGL() {
+  CHECK_EQ(width_, 0) << "Must call UnInitialize before dtor.";
+  Clear();
+}
+
+void RenderingHelperEGL::Initialize(bool suppress_swap_to_display,
+                                    int num_windows,
+                                    int width,
+                                    int height,
+                                    base::WaitableEvent* done) {
+  // Use width_ != 0 as a proxy for the class having already been
+  // Initialize()'d, and UnInitialize() before continuing.
+  if (width_) {
+    base::WaitableEvent done(false, false);
+    UnInitialize(&done);
+    done.Wait();
+  }
+
+  suppress_swap_to_display_ = suppress_swap_to_display;
+  CHECK_GT(width, 0);
+  CHECK_GT(height, 0);
+  width_ = width;
+  height_ = height;
+  message_loop_ = MessageLoop::current();
+  CHECK_GT(num_windows, 0);
+
+  PlatformInitialize();
+
+  egl_display_ = PlatformGetDisplay();
+
+  EGLint major;
+  EGLint minor;
+  CHECK(eglInitialize(egl_display_, &major, &minor)) << eglGetError();
+  static EGLint rgba8888[] = {
+    EGL_RED_SIZE, 8,
+    EGL_GREEN_SIZE, 8,
+    EGL_BLUE_SIZE, 8,
+    EGL_ALPHA_SIZE, 8,
+    EGL_SURFACE_TYPE, EGL_WINDOW_BIT,
+    EGL_NONE,
+  };
+  EGLConfig egl_config;
+  int num_configs;
+  CHECK(eglChooseConfig(egl_display_, rgba8888, &egl_config, 1, &num_configs))
+      << eglGetError();
+  CHECK_GE(num_configs, 1);
+  static EGLint context_attribs[] = {EGL_CONTEXT_CLIENT_VERSION, 2, EGL_NONE};
+  egl_context_ = eglCreateContext(
+      egl_display_, egl_config, EGL_NO_CONTEXT, context_attribs);
+  CHECK_NE(egl_context_, EGL_NO_CONTEXT) << eglGetError();
+
+  // Per-window/surface X11 & EGL initialization.
+  for (int i = 0; i < num_windows; ++i) {
+    // Arrange X windows whimsically, with some padding.
+    int top_left_x = (width + 20) * (i % 4);
+    int top_left_y = (height + 12) * (i % 3);
+
+    EGLNativeWindowType window = PlatformCreateWindow(top_left_x, top_left_y);
+    EGLSurface egl_surface =
+        eglCreateWindowSurface(egl_display_, egl_config, window, NULL);
+    egl_surfaces_.push_back(egl_surface);
+    CHECK_NE(egl_surface, EGL_NO_SURFACE);
+  }
+  CHECK(eglMakeCurrent(egl_display_, egl_surfaces_[0],
+                       egl_surfaces_[0], egl_context_)) << eglGetError();
+
+  static const float kVertices[] =
+      { -1.f, 1.f, -1.f, -1.f, 1.f, 1.f, 1.f, -1.f, };
+  static const float kTextureCoordsEgl[] = { 0, 1, 0, 0, 1, 1, 1, 0, };
+  static const char kVertexShader[] = STRINGIZE(
+      varying vec2 interp_tc;
+      attribute vec4 in_pos;
+      attribute vec2 in_tc;
+      void main() {
+        interp_tc = in_tc;
+        gl_Position = in_pos;
+      }
+  );

[Ami GONE FROM CHROMIUM, 2012/05/17 21:44:47]

I realize you did this on rsesek's suggestion, but I don't think it's defensible
in terms of the style guide.
My memory is vague, but is the trailing \n following the last } actually
necessary?  Because of it isn't, the most styleguidey way of doing this would be
to close with:
        gl_FragColor = texture2D(tex, interp_tc);
      });

(the only reason I'm bothering to comment on this is that the previous
indentation is the only reasonable thing for an editor to auto-indent to, and
it's nice not having to correct your editor's auto-indent).

[sail, 2012/05/23 23:02:29]

Done.

[sail, 2012/05/23 23:02:29]

Done.

+  static const char kFragmentShaderEgl[] = STRINGIZE(
+      precision mediump float;
+      varying vec2 interp_tc;
+      uniform sampler2D tex;
+      void main() {
+        gl_FragColor = texture2D(tex, interp_tc);
+      }
+  );
+  GLuint program = glCreateProgram();
+  CreateShader(program, GL_VERTEX_SHADER,
+               kVertexShader, arraysize(kVertexShader));
+  CreateShader(program, GL_FRAGMENT_SHADER,
+               kFragmentShaderEgl, arraysize(kFragmentShaderEgl));
+  glLinkProgram(program);
+  int result = GL_FALSE;
+  glGetProgramiv(program, GL_LINK_STATUS, &result);
+  if (!result) {
+    char log[4096];
+    glGetShaderInfoLog(program, arraysize(log), NULL, log);
+    LOG(FATAL) << log;
+  }
+  glUseProgram(program);
+  glDeleteProgram(program);
+
+  glUniform1i(glGetUniformLocation(program, "tex"), 0);
+  int pos_location = glGetAttribLocation(program, "in_pos");
+  glEnableVertexAttribArray(pos_location);
+  glVertexAttribPointer(pos_location, 2, GL_FLOAT, GL_FALSE, 0, kVertices);
+  int tc_location = glGetAttribLocation(program, "in_tc");
+  glEnableVertexAttribArray(tc_location);
+  glVertexAttribPointer(tc_location, 2, GL_FLOAT, GL_FALSE, 0,
+                        kTextureCoordsEgl);
+  done->Signal();
+}
+
+void RenderingHelperEGL::UnInitialize(base::WaitableEvent* done) {
+  CHECK_EQ(MessageLoop::current(), message_loop_);
+  CHECK(eglMakeCurrent(egl_display_, EGL_NO_SURFACE, EGL_NO_SURFACE,
+                       EGL_NO_CONTEXT)) << eglGetError();
+  CHECK(eglDestroyContext(egl_display_, egl_context_));
+  for (size_t i = 0; i < egl_surfaces_.size(); ++i)
+    CHECK(eglDestroySurface(egl_display_, egl_surfaces_[i]));
+  CHECK(eglTerminate(egl_display_));
+  Clear();
+  done->Signal();
+}
+
+void RenderingHelperEGL::CreateTexture(int window_id,
+                                       uint32* texture_id,
+                                       base::WaitableEvent* done) {
+  if (MessageLoop::current() != message_loop_) {
+    message_loop_->PostTask(
+        FROM_HERE,
+        base::Bind(&RenderingHelper::CreateTexture, base::Unretained(this),
+                   window_id, texture_id, done));
+    return;
+  }
+  CHECK(eglMakeCurrent(egl_display_, egl_surfaces_[window_id],
+                       egl_surfaces_[window_id], egl_context_))
+      << eglGetError();
+  glGenTextures(1, texture_id);
+  glBindTexture(GL_TEXTURE_2D, *texture_id);
+  glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width_, height_, 0, GL_RGBA,
+               GL_UNSIGNED_BYTE, NULL);
+  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+  // OpenGLES2.0.25 section 3.8.2 requires CLAMP_TO_EDGE for NPOT textures.
+  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
+  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
+  CHECK_EQ(static_cast<int>(glGetError()), GL_NO_ERROR);
+  CHECK_EQ(static_cast<int>(eglGetError()), EGL_SUCCESS);
+  CHECK(texture_id_to_surface_index_.insert(
+      std::make_pair(*texture_id, window_id)).second);
+  done->Signal();
+}
+
+void RenderingHelperEGL::RenderTexture(uint32 texture_id) {
+  CHECK_EQ(MessageLoop::current(), message_loop_);
+  glActiveTexture(GL_TEXTURE0);
+  glBindTexture(GL_TEXTURE_2D, texture_id);
+  glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
+  CHECK_EQ(static_cast<int>(glGetError()), GL_NO_ERROR);
+  CHECK_EQ(static_cast<int>(eglGetError()), EGL_SUCCESS);
+  if (!suppress_swap_to_display_) {
+    int window_id = texture_id_to_surface_index_[texture_id];
+    CHECK(eglMakeCurrent(egl_display_, egl_surfaces_[window_id],
+                         egl_surfaces_[window_id], egl_context_))
+        << eglGetError();
+    eglSwapBuffers(egl_display_, egl_surfaces_[window_id]);
+  }
+  CHECK_EQ(static_cast<int>(eglGetError()), EGL_SUCCESS);
+}
+
+void RenderingHelperEGL::DeleteTexture(uint32 texture_id) {
+  glDeleteTextures(1, &texture_id);
+  CHECK_EQ(static_cast<int>(glGetError()), GL_NO_ERROR);
+}
+
+void* RenderingHelperEGL::GetGLContext() {
+  return egl_context_;
+}
+
+void* RenderingHelperEGL::GetGLDisplay() {
+  return egl_display_;
+}
+
+void RenderingHelperEGL::Clear() {
+  suppress_swap_to_display_ = false;
+  width_ = 0;
+  height_ = 0;
+  texture_id_to_surface_index_.clear();
+  message_loop_ = NULL;
+  egl_display_ = EGL_NO_DISPLAY;
+  egl_context_ = EGL_NO_CONTEXT;
+  egl_surfaces_.clear();
+  PlatformUnInitialize();
+}
+
+#if defined(OS_WIN)
+void RenderingHelperEGL::PlatformInitialize() {}
+
+void RenderingHelperEGL::PlatformUnInitialize() {
+  for (size_t i = 0; i < windows_.size(); ++i) {
+    DestroyWindow(windows_[i]);
+  }
+  windows_.clear();
+}
+
+EGLNativeWindowType RenderingHelperEGL::PlatformCreateWindow(
+    int top_left_x, int top_left_y) {
+  HWND window = CreateWindowEx(0, L"Static", L"VideoDecodeAcceleratorTest",
+                               WS_OVERLAPPEDWINDOW | WS_VISIBLE, top_left_x,
+                               top_left_y, width_, height_, NULL, NULL, NULL,
+                               NULL);
+  CHECK(window != NULL);
+  windows_.push_back(window);
+  return window;
+}
+
+EGLDisplay RenderingHelperEGL::PlatformGetDisplay() {
+  return eglGetDisplay(EGL_DEFAULT_DISPLAY);
+}
+
+#else  // OS_WIN
+
+void RenderingHelperEGL::PlatformInitialize() {
+  CHECK(x_display_ = base::MessagePumpForUI::GetDefaultXDisplay());
+}
+
+void RenderingHelperEGL::PlatformUnInitialize() {
+  // Destroy resources acquired in Initialize, in reverse-acquisition order.
+  for (size_t i = 0; i < x_windows_.size(); ++i) {
+    CHECK(XUnmapWindow(x_display_, x_windows_[i]));
+    CHECK(XDestroyWindow(x_display_, x_windows_[i]));
+  }
+  // Mimic newly created object.
+  x_display_ = NULL;
+  x_windows_.clear();
+}
+
+EGLDisplay RenderingHelperEGL::PlatformGetDisplay() {
+  return eglGetDisplay(x_display_);
+}
+
+EGLNativeWindowType RenderingHelperEGL::PlatformCreateWindow(int top_left_x,
+                                                             int top_left_y) {
+  int depth = DefaultDepth(x_display_, DefaultScreen(x_display_));
+
+  XSetWindowAttributes window_attributes;
+  window_attributes.background_pixel =
+      BlackPixel(x_display_, DefaultScreen(x_display_));
+  window_attributes.override_redirect = true;
+
+  Window x_window = XCreateWindow(
+      x_display_, DefaultRootWindow(x_display_),
+      top_left_x, top_left_y, width_, height_,
+      0 /* border width */,
+      depth, CopyFromParent /* class */, CopyFromParent /* visual */,
+      (CWBackPixel | CWOverrideRedirect), &window_attributes);
+  x_windows_.push_back(x_window);
+  XStoreName(x_display_, x_window, "VideoDecodeAcceleratorTest");
+  XSelectInput(x_display_, x_window, ExposureMask);
+  XMapWindow(x_display_, x_window);
+  return x_window;
+}
+
+#endif  // OS_WIN
+
+}  // namespace video_test_util