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 76
