src/ui/gl/gl_image_android_native_buffer.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/gl/gl_image_android_native_buffer.h"
   6
   7 #include "ui/gl/gl_surface_egl.h"
   8 #include "ui/gl/scoped_binders.h"
   9
  10 namespace gfx {
  11
  12 GLImageAndroidNativeBuffer::GLImageAndroidNativeBuffer(const gfx::Size& size)
  13     : GLImageEGL(size),
  14       release_after_use_(false),
  15       in_use_(false),
  16       target_(0),
  17       egl_image_for_unbind_(EGL_NO_IMAGE_KHR),
  18       texture_id_for_unbind_(0) {
  19 }
  20
  21 GLImageAndroidNativeBuffer::~GLImageAndroidNativeBuffer() {
  22   DCHECK_EQ(EGL_NO_IMAGE_KHR, egl_image_);
  23   DCHECK_EQ(0u, texture_id_for_unbind_);
  24 }
  25
  26 bool GLImageAndroidNativeBuffer::Initialize(EGLClientBuffer native_buffer) {
  27   EGLint attrs[] = {EGL_IMAGE_PRESERVED_KHR, EGL_TRUE, EGL_NONE};
  28   return GLImageEGL::Initialize(
  29       EGL_NATIVE_BUFFER_ANDROID, native_buffer, attrs);
  30 }
  31
  32 void GLImageAndroidNativeBuffer::Destroy(bool have_context) {
  33   if (egl_image_for_unbind_ != EGL_NO_IMAGE_KHR) {
  34     eglDestroyImageKHR(GLSurfaceEGL::GetHardwareDisplay(),
  35                        egl_image_for_unbind_);
  36     egl_image_for_unbind_ = EGL_NO_IMAGE_KHR;
  37   }
  38
  39   if (texture_id_for_unbind_) {
  40     if (have_context)
  41       glDeleteTextures(1, &texture_id_for_unbind_);
  42     texture_id_for_unbind_ = 0u;
  43   }
  44
  45   GLImageEGL::Destroy(have_context);
  46 }
  47
  48 bool GLImageAndroidNativeBuffer::BindTexImage(unsigned target) {
  49   DCHECK_NE(EGL_NO_IMAGE_KHR, egl_image_);
  50
  51   if (target == GL_TEXTURE_RECTANGLE_ARB) {
  52     LOG(ERROR) << "EGLImage cannot be bound to TEXTURE_RECTANGLE_ARB target";
  53     return false;
  54   }
  55
  56   if (target_ && target_ != target) {
  57     LOG(ERROR) << "EGLImage can only be bound to one target";
  58     return false;
  59   }
  60   target_ = target;
  61
  62   // Defer ImageTargetTexture2D if not currently in use.
  63   if (!in_use_)
  64     return true;
  65
  66   glEGLImageTargetTexture2DOES(target_, egl_image_);
  67   DCHECK_EQ(static_cast<GLenum>(GL_NO_ERROR), glGetError());
  68   return true;
  69 }
  70
  71 void GLImageAndroidNativeBuffer::WillUseTexImage() {
  72   DCHECK_NE(EGL_NO_IMAGE_KHR, egl_image_);
  73   DCHECK(!in_use_);
  74   in_use_ = true;
  75   glEGLImageTargetTexture2DOES(target_, egl_image_);
  76   DCHECK_EQ(static_cast<GLenum>(GL_NO_ERROR), glGetError());
  77 }
  78
  79 void GLImageAndroidNativeBuffer::DidUseTexImage() {
  80   DCHECK_NE(EGL_NO_IMAGE_KHR, egl_image_);
  81   DCHECK(in_use_);
  82   in_use_ = false;
  83
  84   if (!release_after_use_)
  85     return;
  86
  87   if (egl_image_for_unbind_ == EGL_NO_IMAGE_KHR) {
  88     DCHECK_EQ(0u, texture_id_for_unbind_);
  89     glGenTextures(1, &texture_id_for_unbind_);
  90
  91     {
  92       ScopedTextureBinder texture_binder(GL_TEXTURE_2D, texture_id_for_unbind_);
  93       glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
  94       glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
  95       glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
  96
  97       char zero[4] = {0, };
  98       glTexImage2D(
  99           GL_TEXTURE_2D, 0, GL_RGBA, 1, 1, 0, GL_RGBA, GL_UNSIGNED_BYTE, &zero);
 100     }
 101
 102     EGLint attrs[] = {EGL_IMAGE_PRESERVED_KHR, EGL_TRUE, EGL_NONE};
 103     // Need to pass current EGL rendering context to eglCreateImageKHR for
 104     // target type EGL_GL_TEXTURE_2D_KHR.
 105     egl_image_for_unbind_ = eglCreateImageKHR(
 106         GLSurfaceEGL::GetHardwareDisplay(),
 107         eglGetCurrentContext(),
 108         EGL_GL_TEXTURE_2D_KHR,
 109         reinterpret_cast<EGLClientBuffer>(texture_id_for_unbind_),
 110         attrs);
 111     DCHECK_NE(EGL_NO_IMAGE_KHR, egl_image_for_unbind_)
 112         << "Error creating EGLImage: " << eglGetError();
 113   }
 114
 115   glEGLImageTargetTexture2DOES(target_, egl_image_for_unbind_);
 116   DCHECK_EQ(static_cast<GLenum>(GL_NO_ERROR), glGetError());
 117 }
 118
 119 bool GLImageAndroidNativeBuffer::ScheduleOverlayPlane(
 120     gfx::AcceleratedWidget widget,
 121     int z_order,
 122     OverlayTransform transform,
 123     const Rect& bounds_rect,
 124     const RectF& crop_rect) {
 125   return false;
 126 }
 127
 128 void GLImageAndroidNativeBuffer::SetReleaseAfterUse() {
 129   release_after_use_ = true;
 130 }
 131
 132 }  // namespace gfx