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/debug/trace_event.h"
   8 #include "ui/gl/android/surface_texture.h"
   9 #include "ui/gl/android/surface_texture_tracker.h"
  10
  11 namespace gfx {
  12
  13 GLImageSurfaceTexture::GLImageSurfaceTexture(gfx::Size size)
  14     : size_(size), texture_id_(0) {}
  15
  16 GLImageSurfaceTexture::~GLImageSurfaceTexture() { Destroy(); }
  17
  18 bool GLImageSurfaceTexture::Initialize(gfx::GpuMemoryBufferHandle buffer) {
  19   DCHECK(!surface_texture_);
  20   surface_texture_ =
  21       SurfaceTextureTracker::GetInstance()->AcquireSurfaceTexture(
  22           buffer.surface_texture_id.primary_id,
  23           buffer.surface_texture_id.secondary_id);
  24   return !!surface_texture_;
  25 }
  26
  27 void GLImageSurfaceTexture::Destroy() {
  28   surface_texture_ = NULL;
  29   texture_id_ = 0;
  30 }
  31
  32 gfx::Size GLImageSurfaceTexture::GetSize() { return size_; }
  33
  34 bool GLImageSurfaceTexture::BindTexImage(unsigned target) {
  35   TRACE_EVENT0("gpu", "GLImageSurfaceTexture::BindTexImage");
  36
  37   if (target != GL_TEXTURE_EXTERNAL_OES) {
  38     LOG(ERROR)
  39         << "Surface texture can only be bound to TEXTURE_EXTERNAL_OES target";
  40     return false;
  41   }
  42
  43   GLint texture_id;
  44   glGetIntegerv(GL_TEXTURE_BINDING_EXTERNAL_OES, &texture_id);
  45   DCHECK(texture_id);
  46
  47   if (texture_id_ && texture_id_ != texture_id) {
  48     LOG(ERROR) << "Surface texture can only be bound to one texture ID";
  49     return false;
  50   }
  51
  52   DCHECK(surface_texture_);
  53   if (texture_id != texture_id_) {
  54     // Note: Surface textures used as gpu memory buffers are created with an
  55     // initial dummy texture id of 0. We need to call DetachFromGLContext() here
  56     // to detach from the dummy texture before we can attach to a real texture
  57     // id. DetachFromGLContext() will delete the texture for the current
  58     // attachment point so it's important that this is never called when
  59     // attached to a real texture id. Detaching from the dummy texture id should
  60     // not cause any problems as the GL should silently ignore 0 when passed to
  61     // glDeleteTextures.
  62     DCHECK_EQ(0, texture_id_);
  63     surface_texture_->DetachFromGLContext();
  64
  65     // This will attach the surface texture to the texture currently bound to
  66     // GL_TEXTURE_EXTERNAL_OES target.
  67     surface_texture_->AttachToGLContext();
  68     texture_id_ = texture_id;
  69   }
  70
  71   surface_texture_->UpdateTexImage();
  72   return true;
  73 }
  74
  75 }  // namespace gfx