2 * copyright (c) 2010 Sveriges Television AB <info@casparcg.com>
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4 * This file is part of CasparCG.
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6 * CasparCG is free software: you can redistribute it and/or modify
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7 * it under the terms of the GNU General Public License as published by
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8 * the Free Software Foundation, either version 3 of the License, or
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9 * (at your option) any later version.
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11 * CasparCG is distributed in the hope that it will be useful,
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12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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14 * GNU General Public License for more details.
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16 * You should have received a copy of the GNU General Public License
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17 * along with CasparCG. If not, see <http://www.gnu.org/licenses/>.
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20 #include "../../stdafx.h"
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22 #include "image_mixer.h"
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23 #include "image_kernel.h"
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25 #include "../gpu/ogl_device.h"
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26 #include "../gpu/host_buffer.h"
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27 #include "../gpu/device_buffer.h"
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28 #include "../write_frame.h"
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30 #include "../../video_channel_context.h"
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32 #include <common/concurrency/executor.h>
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33 #include <common/exception/exceptions.h>
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34 #include <common/gl/gl_check.h>
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36 #include <core/producer/frame/image_transform.h>
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37 #include <core/producer/frame/pixel_format.h>
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38 #include <core/video_format.h>
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40 #include <gl/glew.h>
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42 #include <boost/foreach.hpp>
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43 #include <boost/range.hpp>
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44 #include <boost/range/algorithm/find.hpp>
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46 #include <algorithm>
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49 #include <unordered_map>
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51 namespace caspar { namespace core {
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53 struct image_mixer::implementation : boost::noncopyable
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55 typedef std::deque<render_item> layer;
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57 video_channel_context& channel_;
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59 std::vector<image_transform> transform_stack_;
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60 std::vector<video_mode::type> mode_stack_;
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62 std::deque<std::deque<render_item>> layers_; // layer/stream/items
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64 image_kernel kernel_;
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66 std::shared_ptr<device_buffer> active_buffer_;
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68 implementation(video_channel_context& video_channel)
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69 : channel_(video_channel)
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70 , transform_stack_(1)
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71 , mode_stack_(1, video_mode::progressive)
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77 channel_.ogl().gc();
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80 void begin(core::basic_frame& frame)
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82 transform_stack_.push_back(transform_stack_.back()*frame.get_image_transform());
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83 mode_stack_.push_back(frame.get_mode() == video_mode::progressive ? mode_stack_.back() : frame.get_mode());
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86 void visit(core::write_frame& frame)
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88 CASPAR_ASSERT(!layers_.empty());
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90 // Check if frame has been discarded by interlacing
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91 if(boost::range::find(mode_stack_, video_mode::upper) != mode_stack_.end() && boost::range::find(mode_stack_, video_mode::lower) != mode_stack_.end())
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94 core::render_item item(frame.get_pixel_format_desc(), frame.get_textures(), transform_stack_.back(), mode_stack_.back(), frame.tag());
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96 auto& layer = layers_.back();
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98 if(boost::range::find(layer, item) == layer.end())
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99 layer.push_back(item);
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104 transform_stack_.pop_back();
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105 mode_stack_.pop_back();
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110 layers_.push_back(layer());
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117 boost::unique_future<safe_ptr<host_buffer>> render()
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119 auto layers = std::move(layers_);
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120 return channel_.ogl().begin_invoke([=]() mutable
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122 return render(std::move(layers));
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126 safe_ptr<host_buffer> render(std::deque<layer>&& layers)
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128 std::shared_ptr<device_buffer> layer_key_buffer;
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130 auto draw_buffer = create_device_buffer(4);
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132 BOOST_FOREACH(auto& layer, layers)
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133 draw(std::move(layer), draw_buffer, layer_key_buffer);
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135 auto host_buffer = channel_.ogl().create_host_buffer(channel_.get_format_desc().size, host_buffer::read_only);
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136 channel_.ogl().attach(*draw_buffer);
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137 host_buffer->begin_read(draw_buffer->width(), draw_buffer->height(), format(draw_buffer->stride()));
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139 active_buffer_ = draw_buffer;
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141 channel_.ogl().flush(); // NOTE: This is important, otherwise fences will deadlock.
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143 return host_buffer;
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146 // TODO: We might have more overlaps for opacity transitions
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147 // TODO: What about blending modes, are they ok? Maybe only overlap detection is required for opacity?
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148 void draw(layer&& layer, const safe_ptr<device_buffer>& draw_buffer, std::shared_ptr<device_buffer>& layer_key_buffer)
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153 std::pair<int, std::shared_ptr<device_buffer>> local_key_buffer;
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155 if(has_overlapping_items(layer, layer.front().transform.get_blend_mode()))
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157 auto local_draw_buffer = create_device_buffer(4);
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159 BOOST_FOREACH(auto& item, layer)
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161 item.transform.set_blend_mode(image_transform::blend_mode::normal);
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162 draw_item(std::move(item), local_draw_buffer, local_key_buffer, layer_key_buffer);
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165 kernel_.draw(channel_.ogl(), create_render_item(local_draw_buffer, layer.front().transform.get_blend_mode()), draw_buffer, nullptr, nullptr);
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169 BOOST_FOREACH(auto& item, layer)
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170 draw_item(std::move(item), draw_buffer, local_key_buffer, layer_key_buffer);
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173 CASPAR_ASSERT(local_key_buffer.first == 0 || local_key_buffer.first == core::video_mode:progressive);
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175 std::swap(local_key_buffer.second, layer_key_buffer);
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178 void draw_item(render_item&& item,
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179 const safe_ptr<device_buffer>& draw_buffer,
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180 std::pair<int, std::shared_ptr<device_buffer>>& local_key_buffer,
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181 std::shared_ptr<device_buffer>& layer_key_buffer)
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183 if(item.transform.get_is_key())
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185 if(!local_key_buffer.second)
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187 local_key_buffer.first = 0;
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188 local_key_buffer.second = create_device_buffer(1);
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191 item.transform.set_opacity(1.0);
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192 item.transform.set_blend_mode(image_transform::blend_mode::normal);
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194 local_key_buffer.first |= item.mode;
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195 kernel_.draw(channel_.ogl(), std::move(item), make_safe(local_key_buffer.second), nullptr, nullptr);
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199 kernel_.draw(channel_.ogl(), std::move(item), draw_buffer, local_key_buffer.second, layer_key_buffer);
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200 local_key_buffer.first ^= item.mode;
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202 if(local_key_buffer.first == 0)
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204 local_key_buffer.first = 0;
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205 local_key_buffer.second.reset();
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211 bool has_overlapping_items(const layer& layer, image_transform::blend_mode::type blend_mode)
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216 implementation::layer fill;
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218 std::copy_if(layer.begin(), layer.end(), std::back_inserter(fill), [&](const render_item& item)
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220 return !item.transform.get_is_key();
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223 if(blend_mode == image_transform::blend_mode::normal) // Only overlap if opacity
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225 return std::any_of(fill.begin(), fill.end(), [&](const render_item& item)
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227 return item.transform.get_opacity() < 1.0 - 0.001;
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231 // Simple solution, just check if we have differnt video streams / tags.
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232 return std::any_of(fill.begin(), fill.end(), [&](const render_item& item)
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234 return item.tag != fill.front().tag;
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238 render_item create_render_item(const safe_ptr<device_buffer>& buffer, image_transform::blend_mode::type blend_mode)
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240 CASPAR_ASSERT(buffer->stride() == 4 && "Only used for bgra textures");
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242 pixel_format_desc desc;
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243 desc.pix_fmt = pixel_format::bgra;
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244 desc.planes.push_back(pixel_format_desc::plane(channel_.get_format_desc().width, channel_.get_format_desc().height, 4));
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246 std::vector<safe_ptr<device_buffer>> textures;
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247 textures.push_back(buffer);
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249 image_transform transform;
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250 transform.set_blend_mode(blend_mode);
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252 return render_item(desc, std::move(textures), transform, video_mode::progressive, nullptr);
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255 safe_ptr<device_buffer> create_device_buffer(size_t stride)
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257 auto buffer = channel_.ogl().create_device_buffer(channel_.get_format_desc().width, channel_.get_format_desc().height, stride);
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258 channel_.ogl().clear(*buffer);
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262 safe_ptr<write_frame> create_frame(const void* tag, const core::pixel_format_desc& desc)
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264 return make_safe<write_frame>(channel_.ogl(), tag, desc);
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268 image_mixer::image_mixer(video_channel_context& video_channel) : impl_(new implementation(video_channel)){}
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269 void image_mixer::begin(core::basic_frame& frame){impl_->begin(frame);}
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270 void image_mixer::visit(core::write_frame& frame){impl_->visit(frame);}
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271 void image_mixer::end(){impl_->end();}
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272 boost::unique_future<safe_ptr<host_buffer>> image_mixer::render(){return impl_->render();}
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273 safe_ptr<write_frame> image_mixer::create_frame(const void* tag, const core::pixel_format_desc& desc){return impl_->create_frame(tag, desc);}
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274 void image_mixer::begin_layer(){impl_->begin_layer();}
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275 void image_mixer::end_layer(){impl_->end_layer();}
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276 image_mixer& image_mixer::operator=(image_mixer&& other)
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278 impl_ = std::move(other.impl_);
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