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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24 #include "image_kernel.h"
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25 #include "../write_frame.h"
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26 #include "../gpu/ogl_device.h"
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27 #include "../gpu/host_buffer.h"
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28 #include "../gpu/device_buffer.h"
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29 #include "../../video_channel_context.h"
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31 #include <common/exception/exceptions.h>
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32 #include <common/gl/gl_check.h>
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33 #include <common/utility/move_on_copy.h>
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35 #include <core/producer/frame/frame_transform.h>
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36 #include <core/producer/frame/pixel_format.h>
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37 #include <core/video_format.h>
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39 #include <gl/glew.h>
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41 #include <boost/foreach.hpp>
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43 #include <algorithm>
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46 using namespace boost::assign;
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48 namespace caspar { namespace core {
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52 std::vector<render_item> items;
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53 blend_mode::type blend_mode;
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55 layer(blend_mode::type blend_mode) : blend_mode(blend_mode)
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60 class image_renderer
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62 video_channel_context& channel_;
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63 image_kernel kernel_;
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64 std::shared_ptr<device_buffer> active_buffer_;
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66 image_renderer(video_channel_context& channel)
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71 boost::unique_future<safe_ptr<host_buffer>> render(std::vector<layer>&& layers)
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73 auto layers2 = make_move_on_copy(std::move(layers));
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74 return channel_.ogl().begin_invoke([=]
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76 return do_render(std::move(layers2.value));
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81 safe_ptr<host_buffer> do_render(std::vector<layer>&& layers)
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83 std::shared_ptr<device_buffer> layer_key_buffer;
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85 auto draw_buffer = create_device_buffer(4);
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87 BOOST_FOREACH(auto& layer, layers)
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88 draw_layer(std::move(layer), draw_buffer, layer_key_buffer);
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90 auto host_buffer = channel_.ogl().create_host_buffer(channel_.get_format_desc().size, host_buffer::read_only);
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91 channel_.ogl().attach(*draw_buffer);
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92 host_buffer->begin_read(draw_buffer->width(), draw_buffer->height(), format(draw_buffer->stride()));
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94 active_buffer_ = draw_buffer;
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96 channel_.ogl().flush(); // NOTE: This is important, otherwise fences will deadlock.
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101 void draw_layer(layer&& layer, const safe_ptr<device_buffer>& draw_buffer, std::shared_ptr<device_buffer>& layer_key_buffer)
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103 if(layer.items.empty())
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106 std::pair<int, std::shared_ptr<device_buffer>> local_key_buffer = std::make_pair(0, nullptr); // int is fields flag
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108 if(layer.blend_mode != blend_mode::normal && has_overlapping_items(layer))
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110 auto layer_draw_buffer = create_device_buffer(4); // int is fields flag
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112 BOOST_FOREACH(auto& item, layer.items)
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113 draw_item(std::move(item), *layer_draw_buffer, local_key_buffer, layer_key_buffer);
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116 item.pix_desc.pix_fmt = pixel_format::bgra;
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117 item.pix_desc.planes = list_of(pixel_format_desc::plane(channel_.get_format_desc().width, channel_.get_format_desc().height, 4));
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118 item.textures = list_of(layer_draw_buffer);
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119 item.transform = frame_transform();
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120 item.blend_mode = layer.blend_mode;
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122 kernel_.draw(channel_.ogl(), std::move(item), *draw_buffer, nullptr, nullptr);
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126 BOOST_FOREACH(auto& item, layer.items)
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127 draw_item(std::move(item), *draw_buffer, local_key_buffer, layer_key_buffer);
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130 CASPAR_ASSERT(local_key_buffer.first == 0 || local_key_buffer.first == core::field_mode::progressive);
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132 std::swap(local_key_buffer.second, layer_key_buffer);
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135 void draw_item(render_item&& item,
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136 device_buffer& draw_buffer,
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137 std::pair<int, std::shared_ptr<device_buffer>>& local_key_buffer,
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138 std::shared_ptr<device_buffer>& layer_key_buffer)
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140 if(item.transform.is_key)
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142 if(!local_key_buffer.second)
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144 local_key_buffer.first = 0;
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145 local_key_buffer.second = create_device_buffer(1);
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148 local_key_buffer.first |= item.transform.field_mode; // Add field to flag.
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149 kernel_.draw(channel_.ogl(), std::move(item), *local_key_buffer.second, nullptr, nullptr);
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153 kernel_.draw(channel_.ogl(), std::move(item), draw_buffer, local_key_buffer.second, layer_key_buffer);
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154 local_key_buffer.first ^= item.transform.field_mode; // Remove field from flag.
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156 if(local_key_buffer.first == 0) // If all fields from key has been used, reset it
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158 local_key_buffer.first = 0;
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159 local_key_buffer.second.reset();
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164 bool has_overlapping_items(const layer& layer)
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166 auto upper_count = boost::range::count_if(layer.items, [&](const render_item& item)
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168 return !item.transform.is_key && (item.transform.field_mode & field_mode::upper);
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171 auto lower_count = boost::range::count_if(layer.items, [&](const render_item& item)
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173 return !item.transform.is_key && (item.transform.field_mode & field_mode::lower);
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176 return upper_count > 1 || lower_count > 1;
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179 safe_ptr<device_buffer> create_device_buffer(size_t stride)
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181 auto buffer = channel_.ogl().create_device_buffer(channel_.get_format_desc().width, channel_.get_format_desc().height, stride);
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182 channel_.ogl().clear(*buffer);
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188 struct image_mixer::implementation : boost::noncopyable
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191 image_renderer renderer_;
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192 std::vector<frame_transform> transform_stack_;
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193 std::vector<layer> layers_; // layer/stream/items
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195 implementation(video_channel_context& video_channel)
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196 : ogl_(video_channel.ogl())
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197 , renderer_(video_channel)
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198 , transform_stack_(1)
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202 void begin_layer(blend_mode::type blend_mode)
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204 layers_.push_back(layer(blend_mode));
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207 void begin(core::basic_frame& frame)
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209 transform_stack_.push_back(transform_stack_.back()*frame.get_frame_transform());
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212 void visit(core::write_frame& frame)
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214 if(transform_stack_.back().field_mode == field_mode::empty)
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217 core::render_item item;
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218 item.pix_desc = frame.get_pixel_format_desc();
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219 item.textures = frame.get_textures();
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220 item.transform = transform_stack_.back();
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222 layers_.back().items.push_back(item);
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227 transform_stack_.pop_back();
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234 boost::unique_future<safe_ptr<host_buffer>> render()
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236 return renderer_.render(std::move(layers_));
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239 safe_ptr<write_frame> create_frame(const void* tag, const core::pixel_format_desc& desc)
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241 return make_safe<write_frame>(ogl_, tag, desc);
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245 image_mixer::image_mixer(video_channel_context& video_channel) : impl_(new implementation(video_channel)){}
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246 void image_mixer::begin(core::basic_frame& frame){impl_->begin(frame);}
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247 void image_mixer::visit(core::write_frame& frame){impl_->visit(frame);}
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248 void image_mixer::end(){impl_->end();}
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249 boost::unique_future<safe_ptr<host_buffer>> image_mixer::render(){return impl_->render();}
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250 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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251 void image_mixer::begin_layer(blend_mode::type blend_mode){impl_->begin_layer(blend_mode);}
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252 void image_mixer::end_layer(){impl_->end_layer();}
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253 image_mixer& image_mixer::operator=(image_mixer&& other)
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255 impl_ = std::move(other.impl_);
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