ui/gl/gl_image_surface_texture.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_surface_texture.h"
   6
   7 #include "base/trace_event/trace_event.h"
   8 #include "ui/gl/android/surface_texture.h"
   9
  10 namespace gfx {
  11
  12 GLImageSurfaceTexture::GLImageSurfaceTexture(const gfx::Size& size)
  13     : size_(size), texture_id_(0) {
  14 }
  15
  16 GLImageSurfaceTexture::~GLImageSurfaceTexture() {
  17   DCHECK(thread_checker_.CalledOnValidThread());
  18   DCHECK(!surface_texture_.get());
  19   DCHECK_EQ(0, texture_id_);
  20 }
  21
  22 bool GLImageSurfaceTexture::Initialize(SurfaceTexture* surface_texture) {
  23   DCHECK(thread_checker_.CalledOnValidThread());
  24   DCHECK(!surface_texture_.get());
  25   surface_texture_ = surface_texture;
  26   return true;
  27 }
  28
  29 void GLImageSurfaceTexture::Destroy(bool have_context) {
  30   DCHECK(thread_checker_.CalledOnValidThread());
  31   surface_texture_ = NULL;
  32   texture_id_ = 0;
  33 }
  34
  35 gfx::Size GLImageSurfaceTexture::GetSize() { return size_; }
  36
  37 unsigned GLImageSurfaceTexture::GetInternalFormat() { return GL_RGBA; }
  38
  39 bool GLImageSurfaceTexture::BindTexImage(unsigned target) {
  40   TRACE_EVENT0("gpu", "GLImageSurfaceTexture::BindTexImage");
  41   DCHECK(thread_checker_.CalledOnValidThread());
  42
  43   if (target != GL_TEXTURE_EXTERNAL_OES) {
  44     LOG(ERROR)
  45         << "Surface texture can only be bound to TEXTURE_EXTERNAL_OES target";
  46     return false;
  47   }
  48
  49   GLint texture_id;
  50   glGetIntegerv(GL_TEXTURE_BINDING_EXTERNAL_OES, &texture_id);
  51   DCHECK(texture_id);
  52
  53   if (texture_id_ && texture_id_ != texture_id) {
  54     LOG(ERROR) << "Surface texture can only be bound to one texture ID";
  55     return false;
  56   }
  57
  58   DCHECK(surface_texture_.get());
  59   if (texture_id != texture_id_) {
  60     // Note: Surface textures used as gpu memory buffers are created with an
  61     // initial dummy texture id of 0. We need to call DetachFromGLContext() here
  62     // to detach from the dummy texture before we can attach to a real texture
  63     // id. DetachFromGLContext() will delete the texture for the current
  64     // attachment point so it's important that this is never called when
  65     // attached to a real texture id. Detaching from the dummy texture id should
  66     // not cause any problems as the GL should silently ignore 0 when passed to
  67     // glDeleteTextures.
  68     DCHECK_EQ(0, texture_id_);
  69     surface_texture_->DetachFromGLContext();
  70
  71     // This will attach the surface texture to the texture currently bound to
  72     // GL_TEXTURE_EXTERNAL_OES target.
  73     surface_texture_->AttachToGLContext();
  74     texture_id_ = texture_id;
  75   }
  76
  77   surface_texture_->UpdateTexImage();
  78   return true;
  79 }
  80
  81 bool GLImageSurfaceTexture::CopyTexSubImage(unsigned target,
  82                                             const Point& offset,
  83                                             const Rect& rect) {
  84   return false;
  85 }
  86
  87 bool GLImageSurfaceTexture::ScheduleOverlayPlane(gfx::AcceleratedWidget widget,
  88                                                  int z_order,
  89                                                  OverlayTransform transform,
  90                                                  const Rect& bounds_rect,
  91                                                  const RectF& crop_rect) {
  92   return false;
  93 }
  94
  95 }  // namespace gfx