src/content/renderer/gpu/mailbox_output_surface.cc

   1 // Copyright (c) 2012 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 "content/renderer/gpu/mailbox_output_surface.h"
   6
   7 #include "base/logging.h"
   8 #include "cc/output/compositor_frame.h"
   9 #include "cc/output/compositor_frame_ack.h"
  10 #include "cc/output/gl_frame_data.h"
  11 #include "cc/resources/resource_provider.h"
  12 #include "third_party/WebKit/public/platform/WebGraphicsContext3D.h"
  13 #include "third_party/khronos/GLES2/gl2.h"
  14 #include "third_party/khronos/GLES2/gl2ext.h"
  15
  16 using cc::CompositorFrame;
  17 using cc::GLFrameData;
  18 using cc::ResourceProvider;
  19 using gpu::Mailbox;
  20
  21 namespace content {
  22
  23 MailboxOutputSurface::MailboxOutputSurface(
  24     int32 routing_id,
  25     uint32 output_surface_id,
  26     const scoped_refptr<ContextProviderCommandBuffer>& context_provider,
  27     scoped_ptr<cc::SoftwareOutputDevice> software_device,
  28     cc::ResourceFormat format)
  29     : CompositorOutputSurface(routing_id,
  30                               output_surface_id,
  31                               context_provider,
  32                               software_device.Pass(),
  33                               true),
  34       fbo_(0),
  35       is_backbuffer_discarded_(false),
  36       format_(format) {
  37   pending_textures_.push_back(TransferableFrame());
  38   capabilities_.max_frames_pending = 1;
  39   capabilities_.uses_default_gl_framebuffer = false;
  40 }
  41
  42 MailboxOutputSurface::~MailboxOutputSurface() {
  43   DiscardBackbuffer();
  44   while (!pending_textures_.empty()) {
  45     if (pending_textures_.front().texture_id) {
  46       context_provider_->Context3d()->deleteTexture(
  47           pending_textures_.front().texture_id);
  48     }
  49     pending_textures_.pop_front();
  50   }
  51 }
  52
  53 void MailboxOutputSurface::EnsureBackbuffer() {
  54   is_backbuffer_discarded_ = false;
  55
  56   WebKit::WebGraphicsContext3D* context3d = context_provider_->Context3d();
  57
  58   if (!current_backing_.texture_id) {
  59     // Find a texture of matching size to recycle.
  60     while (!returned_textures_.empty()) {
  61       TransferableFrame& texture = returned_textures_.front();
  62       if (texture.size == surface_size_) {
  63         current_backing_ = texture;
  64         if (current_backing_.sync_point)
  65           context3d->waitSyncPoint(current_backing_.sync_point);
  66         returned_textures_.pop();
  67         break;
  68       }
  69
  70       context3d->deleteTexture(texture.texture_id);
  71       returned_textures_.pop();
  72     }
  73
  74     if (!current_backing_.texture_id) {
  75       current_backing_.texture_id = context3d->createTexture();
  76       current_backing_.size = surface_size_;
  77       context3d->bindTexture(GL_TEXTURE_2D, current_backing_.texture_id);
  78       context3d->texParameteri(
  79           GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
  80       context3d->texParameteri(
  81           GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
  82       context3d->texParameteri(
  83           GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
  84       context3d->texParameteri(
  85           GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
  86       context3d->texImage2D(
  87           GL_TEXTURE_2D,
  88           0,
  89           GLInternalFormat(format_),
  90           surface_size_.width(),
  91           surface_size_.height(),
  92           0,
  93           GLDataFormat(format_),
  94           GLDataType(format_),
  95           NULL);
  96       context3d->genMailboxCHROMIUM(current_backing_.mailbox.name);
  97       context3d->produceTextureCHROMIUM(
  98           GL_TEXTURE_2D, current_backing_.mailbox.name);
  99     }
 100   }
 101 }
 102
 103 void MailboxOutputSurface::DiscardBackbuffer() {
 104   is_backbuffer_discarded_ = true;
 105
 106   WebKit::WebGraphicsContext3D* context3d = context_provider_->Context3d();
 107
 108   if (current_backing_.texture_id) {
 109     context3d->deleteTexture(current_backing_.texture_id);
 110     current_backing_ = TransferableFrame();
 111   }
 112
 113   while (!returned_textures_.empty()) {
 114     const TransferableFrame& frame = returned_textures_.front();
 115     context3d->deleteTexture(frame.texture_id);
 116     returned_textures_.pop();
 117   }
 118
 119   if (fbo_) {
 120     context3d->bindFramebuffer(GL_FRAMEBUFFER, fbo_);
 121     context3d->deleteFramebuffer(fbo_);
 122     fbo_ = 0;
 123   }
 124 }
 125
 126 void MailboxOutputSurface::Reshape(gfx::Size size, float scale_factor) {
 127   if (size == surface_size_)
 128     return;
 129
 130   surface_size_ = size;
 131   device_scale_factor_ = scale_factor;
 132   DiscardBackbuffer();
 133   EnsureBackbuffer();
 134 }
 135
 136 void MailboxOutputSurface::BindFramebuffer() {
 137   EnsureBackbuffer();
 138   DCHECK(current_backing_.texture_id);
 139
 140   WebKit::WebGraphicsContext3D* context3d = context_provider_->Context3d();
 141
 142   if (!fbo_)
 143     fbo_ = context3d->createFramebuffer();
 144   context3d->bindFramebuffer(GL_FRAMEBUFFER, fbo_);
 145   context3d->framebufferTexture2D(
 146       GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D,
 147       current_backing_.texture_id, 0);
 148 }
 149
 150 void MailboxOutputSurface::OnSwapAck(uint32 output_surface_id,
 151                                      const cc::CompositorFrameAck& ack) {
 152   // Ignore message if it's a stale one coming from a different output surface
 153   // (e.g. after a lost context).
 154   if (output_surface_id != output_surface_id_) {
 155     CompositorOutputSurface::OnSwapAck(output_surface_id, ack);
 156     return;
 157   }
 158   if (!ack.gl_frame_data->mailbox.IsZero()) {
 159     DCHECK(!ack.gl_frame_data->size.IsEmpty());
 160     // The browser could be returning the oldest or any other pending texture
 161     // if it decided to skip a frame.
 162     std::deque<TransferableFrame>::iterator it;
 163     for (it = pending_textures_.begin(); it != pending_textures_.end(); it++) {
 164       DCHECK(!it->mailbox.IsZero());
 165       if (!memcmp(it->mailbox.name,
 166                   ack.gl_frame_data->mailbox.name,
 167                   sizeof(it->mailbox.name))) {
 168         DCHECK(it->size == ack.gl_frame_data->size);
 169         break;
 170       }
 171     }
 172     DCHECK(it != pending_textures_.end());
 173     it->sync_point = ack.gl_frame_data->sync_point;
 174
 175     if (!is_backbuffer_discarded_) {
 176       returned_textures_.push(*it);
 177     } else {
 178       context_provider_->Context3d()->deleteTexture(it->texture_id);
 179     }
 180
 181     pending_textures_.erase(it);
 182   } else {
 183     DCHECK(!pending_textures_.empty());
 184     // The browser always keeps one texture as the frontbuffer.
 185     // If it does not return a mailbox, it discarded the frontbuffer which is
 186     // the oldest texture we sent.
 187     uint32 texture_id = pending_textures_.front().texture_id;
 188     if (texture_id)
 189       context_provider_->Context3d()->deleteTexture(texture_id);
 190     pending_textures_.pop_front();
 191   }
 192   CompositorOutputSurface::OnSwapAck(output_surface_id, ack);
 193 }
 194
 195 void MailboxOutputSurface::SwapBuffers(cc::CompositorFrame* frame) {
 196   DCHECK(frame->gl_frame_data);
 197   DCHECK(!surface_size_.IsEmpty());
 198   DCHECK(surface_size_ == current_backing_.size);
 199   DCHECK(frame->gl_frame_data->size == current_backing_.size);
 200   DCHECK(!current_backing_.mailbox.IsZero() ||
 201          context_provider_->Context3d()->isContextLost());
 202
 203   frame->gl_frame_data->mailbox = current_backing_.mailbox;
 204   context_provider_->Context3d()->flush();
 205   frame->gl_frame_data->sync_point =
 206       context_provider_->Context3d()->insertSyncPoint();
 207   CompositorOutputSurface::SwapBuffers(frame);
 208
 209   pending_textures_.push_back(current_backing_);
 210   current_backing_ = TransferableFrame();
 211 }
 212
 213 size_t MailboxOutputSurface::GetNumAcksPending() {
 214   DCHECK(pending_textures_.size());
 215   return pending_textures_.size() - 1;
 216 }
 217
 218 }  // namespace content