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// 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/gl/gl_image_surface_texture.h"
#include "base/debug/trace_event.h"
#include "ui/gl/android/surface_texture.h"
#include "ui/gl/android/surface_texture_tracker.h"
namespace gfx {
GLImageSurfaceTexture::GLImageSurfaceTexture(gfx::Size size)
: size_(size), texture_id_(0) {}
GLImageSurfaceTexture::~GLImageSurfaceTexture() { Destroy(); }
bool GLImageSurfaceTexture::Initialize(gfx::GpuMemoryBufferHandle buffer) {
DCHECK(!surface_texture_);
surface_texture_ =
SurfaceTextureTracker::GetInstance()->AcquireSurfaceTexture(
buffer.surface_texture_id.primary_id,
buffer.surface_texture_id.secondary_id);
return !!surface_texture_;
}
void GLImageSurfaceTexture::Destroy() {
surface_texture_ = NULL;
texture_id_ = 0;
}
gfx::Size GLImageSurfaceTexture::GetSize() { return size_; }
bool GLImageSurfaceTexture::BindTexImage(unsigned target) {
TRACE_EVENT0("gpu", "GLImageSurfaceTexture::BindTexImage");
if (target != GL_TEXTURE_EXTERNAL_OES) {
LOG(ERROR)
<< "Surface texture can only be bound to TEXTURE_EXTERNAL_OES target";
return false;
}
GLint texture_id;
glGetIntegerv(GL_TEXTURE_BINDING_EXTERNAL_OES, &texture_id);
DCHECK(texture_id);
if (texture_id_ && texture_id_ != texture_id) {
LOG(ERROR) << "Surface texture can only be bound to one texture ID";
return false;
}
DCHECK(surface_texture_);
if (texture_id != texture_id_) {
// Note: Surface textures used as gpu memory buffers are created with an
// initial dummy texture id of 0. We need to call DetachFromGLContext() here
// to detach from the dummy texture before we can attach to a real texture
// id. DetachFromGLContext() will delete the texture for the current
// attachment point so it's important that this is never called when
// attached to a real texture id. Detaching from the dummy texture id should
// not cause any problems as the GL should silently ignore 0 when passed to
// glDeleteTextures.
DCHECK_EQ(0, texture_id_);
surface_texture_->DetachFromGLContext();
// This will attach the surface texture to the texture currently bound to
// GL_TEXTURE_EXTERNAL_OES target.
surface_texture_->AttachToGLContext();
texture_id_ = texture_id;
}
surface_texture_->UpdateTexImage();
return true;
}
} // namespace gfx
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