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 <boost/foreach.hpp>
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43 #include <unordered_map>
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45 namespace caspar { namespace core {
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47 struct image_mixer::implementation : boost::noncopyable
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49 static const size_t LOCAL_KEY_INDEX = 3;
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50 static const size_t LAYER_KEY_INDEX = 4;
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54 pixel_format_desc desc;
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55 std::vector<safe_ptr<device_buffer>> textures;
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56 core::image_transform transform;
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59 video_channel_context& channel_;
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61 std::stack<core::image_transform> transform_stack_;
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62 std::queue<std::queue<render_item>> render_queue_;
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64 image_kernel kernel_;
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66 safe_ptr<host_buffer> read_buffer_;
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67 safe_ptr<device_buffer> draw_buffer_;
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68 safe_ptr<device_buffer> write_buffer_;
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70 safe_ptr<device_buffer> local_key_buffer_;
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71 safe_ptr<device_buffer> layer_key_buffer_;
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77 implementation(video_channel_context& video_channel)
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78 : channel_(video_channel)
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79 , read_buffer_(video_channel.ogl.create_host_buffer(video_channel.format_desc.size, host_buffer::read_only))
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80 , draw_buffer_(video_channel.ogl.create_device_buffer(video_channel.format_desc.width, channel_.format_desc.height, 4))
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81 , write_buffer_ (video_channel.ogl.create_device_buffer(video_channel.format_desc.width, channel_.format_desc.height, 4))
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82 , local_key_buffer_(video_channel.ogl.create_device_buffer(video_channel.format_desc.width, channel_.format_desc.height, 1))
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83 , layer_key_buffer_(video_channel.ogl.create_device_buffer(video_channel.format_desc.width, channel_.format_desc.height, 1))
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87 transform_stack_.push(core::image_transform());
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90 void begin(const core::basic_frame& frame)
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92 transform_stack_.push(transform_stack_.top()*frame.get_image_transform());
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95 void visit(core::write_frame& frame)
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97 render_item item = {frame.get_pixel_format_desc(), frame.get_textures(), transform_stack_.top()*frame.get_image_transform()};
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98 render_queue_.back().push(item);
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103 transform_stack_.pop();
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108 render_queue_.push(std::queue<render_item>());
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115 void reinitialize_buffers()
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117 read_buffer_ = channel_.ogl.create_host_buffer(channel_.format_desc.size, host_buffer::read_only);
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118 draw_buffer_ = channel_.ogl.create_device_buffer(channel_.format_desc.width, channel_.format_desc.height, 4);
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119 write_buffer_ = channel_.ogl.create_device_buffer(channel_.format_desc.width, channel_.format_desc.height, 4);
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120 local_key_buffer_ = channel_.ogl.create_device_buffer(channel_.format_desc.width, channel_.format_desc.height, 1);
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121 layer_key_buffer_ = channel_.ogl.create_device_buffer(channel_.format_desc.width, channel_.format_desc.height, 1);
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125 safe_ptr<host_buffer> render()
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127 auto read_buffer = read_buffer_;
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128 auto result = channel_.ogl.begin_invoke([=]() -> safe_ptr<host_buffer>
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130 read_buffer->map();
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131 return read_buffer;
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134 auto render_queue = std::move(render_queue_);
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136 channel_.ogl.begin_invoke([=]() mutable
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138 if(draw_buffer_->width() != channel_.format_desc.width || draw_buffer_->height() != channel_.format_desc.height)
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139 reinitialize_buffers();
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141 local_key_ = false;
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142 layer_key_ = false;
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145 local_key_buffer_->clear();
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146 layer_key_buffer_->clear();
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147 draw_buffer_->clear();
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149 // Draw items in device.
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151 while(!render_queue.empty())
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153 auto layer = render_queue.front();
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154 render_queue.pop();
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156 draw_buffer_->attach();
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158 while(!layer.empty())
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160 draw(layer.front());
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162 channel_.ogl.yield(); // Allow quick buffer allocation to execute.
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165 layer_key_ = local_key_; // If there was only key in last layer then use it as key for the entire next layer.
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166 local_key_ = false;
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168 std::swap(local_key_buffer_, layer_key_buffer_);
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171 std::swap(draw_buffer_, write_buffer_);
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173 // Start transfer from device to host.
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174 read_buffer_ = channel_.ogl.create_host_buffer(channel_.format_desc.size, host_buffer::read_only);
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175 write_buffer_->write(*read_buffer_);
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178 return std::move(result.get());
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181 void draw(const render_item& item)
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185 for(size_t n = 0; n < item.textures.size(); ++n)
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186 item.textures[n]->bind(n);
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188 // Setup key and kernel
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190 bool local_key = false;
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191 bool layer_key = false;
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193 if(item.transform.get_is_key()) // This is a key frame, render it to the local_key buffer for later use.
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195 if(!local_key_) // Initialize local-key if it is not active.
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197 local_key_buffer_->clear();
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198 local_key_buffer_->attach();
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202 else // This is a normal frame. Use key buffers if they are active.
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204 local_key = local_key_;
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205 layer_key = layer_key_;
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207 if(local_key_) // Use local key if we have it.
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209 local_key_buffer_->bind(LOCAL_KEY_INDEX);
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210 draw_buffer_->attach();
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211 local_key_ = false; // Use it only one time.
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214 if(layer_key_) // Use layer key if we have it.
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215 layer_key_buffer_->bind(LAYER_KEY_INDEX);
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220 kernel_.draw(channel_.format_desc.width, channel_.format_desc.height, item.desc, item.transform, local_key, layer_key);
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223 safe_ptr<write_frame> create_frame(void* tag, const core::pixel_format_desc& desc)
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225 return make_safe<write_frame>(channel_.ogl, reinterpret_cast<int>(tag), desc);
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229 image_mixer::image_mixer(video_channel_context& video_channel) : impl_(new implementation(video_channel)){}
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230 void image_mixer::begin(const core::basic_frame& frame){impl_->begin(frame);}
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231 void image_mixer::visit(core::write_frame& frame){impl_->visit(frame);}
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232 void image_mixer::end(){impl_->end();}
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233 safe_ptr<host_buffer> image_mixer::render(){return impl_->render();}
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234 safe_ptr<write_frame> image_mixer::create_frame(void* tag, const core::pixel_format_desc& desc){return impl_->create_frame(tag, desc);}
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235 void image_mixer::begin_layer(){impl_->begin_layer();}
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236 void image_mixer::end_layer(){impl_->end_layer();}
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