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 "../gpu/gpu_write_frame.h"
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30 #include <common/concurrency/executor.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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34 #include <core/producer/frame/image_transform.h>
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35 #include <core/producer/frame/pixel_format.h>
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36 #include <core/video_format.h>
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38 #include <boost/foreach.hpp>
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41 #include <SFML/Window/Context.hpp>
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44 #include <unordered_map>
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46 namespace caspar { namespace mixer {
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48 struct image_mixer::implementation : boost::noncopyable
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50 const core::video_format_desc format_desc_;
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52 std::stack<core::image_transform> transform_stack_;
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55 std::array<std::shared_ptr<device_buffer>, 2> render_targets_;
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56 std::shared_ptr<device_buffer> key_target_;
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59 std::shared_ptr<host_buffer> reading_;
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61 image_kernel kernel_;
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65 core::pixel_format_desc desc;
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66 std::vector<safe_ptr<device_buffer>> textures;
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67 core::image_transform transform;
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70 std::vector<render_item> waiting_queue_;
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71 std::vector<render_item> render_queue_;
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74 implementation(const core::video_format_desc& format_desc)
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75 : format_desc_(format_desc)
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78 ogl_device::invoke([]
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80 if(!GLEE_VERSION_3_0)
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81 BOOST_THROW_EXCEPTION(not_supported() << msg_info("Missing OpenGL 3.0 support."));
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84 ogl_device::begin_invoke([=]
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86 transform_stack_.push(core::image_transform());
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87 transform_stack_.top().set_mode(core::video_mode::progressive);
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89 GL(glEnable(GL_TEXTURE_2D));
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90 GL(glDisable(GL_DEPTH_TEST));
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92 key_target_ = ogl_device::create_device_buffer(format_desc.width, format_desc.height, 4);
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93 render_targets_[0] = ogl_device::create_device_buffer(format_desc.width, format_desc.height, 4);
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94 render_targets_[1] = ogl_device::create_device_buffer(format_desc.width, format_desc.height, 4);
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96 GL(glGenFramebuffers(1, &fbo_));
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97 GL(glBindFramebuffer(GL_FRAMEBUFFER_EXT, fbo_));
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98 GL(glReadBuffer(GL_COLOR_ATTACHMENT0_EXT));
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100 reading_ = ogl_device::create_host_buffer(format_desc_.size, host_buffer::read_only);
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106 glDeleteFramebuffersEXT(1, &fbo_);
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109 void begin(const core::basic_frame& frame)
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111 transform_stack_.push(transform_stack_.top()*frame.get_image_transform());
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114 void visit(core::write_frame& frame)
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116 auto gpu_frame = dynamic_cast<gpu_write_frame*>(&frame);
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120 auto desc = gpu_frame->get_pixel_format_desc();
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121 auto buffers = gpu_frame->get_plane_buffers();
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122 auto transform = transform_stack_.top();
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124 ogl_device::begin_invoke([=]
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129 item.transform = transform;
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131 for(size_t n = 0; n < buffers.size(); ++n)
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133 GL(glActiveTexture(GL_TEXTURE0+n));
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134 auto texture = ogl_device::create_device_buffer(desc.planes[n].width, desc.planes[n].height, desc.planes[n].channels);
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135 texture->read(*buffers[n]);
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136 item.textures.push_back(texture);
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139 waiting_queue_.push_back(item);
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145 transform_stack_.pop();
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148 boost::unique_future<safe_ptr<const host_buffer>> render()
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150 auto result = ogl_device::begin_invoke([=]() -> safe_ptr<const host_buffer>
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152 reading_->map(); // Might block.
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153 return make_safe(reading_);
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156 ogl_device::begin_invoke([=]
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160 // Clear and bind frame-buffers.
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162 key_target_->attach();
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163 GL(glClear(GL_COLOR_BUFFER_BIT));
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165 render_targets_[0]->attach();
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166 GL(glClear(GL_COLOR_BUFFER_BIT));
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170 BOOST_FOREACH(auto item, render_queue_)
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173 // Move waiting items to queue.
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175 render_queue_ = std::move(waiting_queue_);
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177 // Start read-back.
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179 reading_ = ogl_device::create_host_buffer(format_desc_.size, host_buffer::read_only);
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180 render_targets_[0]->attach();
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181 render_targets_[0]->write(*reading_);
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182 std::swap(render_targets_[0], render_targets_[1]);
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185 return std::move(result);
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188 void render(const render_item& item)
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190 const auto desc = item.desc;
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191 auto textures = item.textures;
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192 const auto transform = item.transform;
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196 for(size_t n = 0; n < textures.size(); ++n)
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198 GL(glActiveTexture(GL_TEXTURE0+n));
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199 textures[n]->bind();
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202 // Setup key and kernel
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204 if(transform.get_is_key())
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206 kernel_.apply(desc, transform, false);
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209 key_target_->attach();
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211 GL(glClear(GL_COLOR_BUFFER_BIT));
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216 kernel_.apply(desc, transform, is_key_);
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221 render_targets_[0]->attach();
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222 GL(glActiveTexture(GL_TEXTURE0+3));
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223 key_target_->bind();
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227 GL(glColor4d(1.0, 1.0, 1.0, transform.get_opacity()));
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228 GL(glViewport(0, 0, format_desc_.width, format_desc_.height));
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230 auto m_p = transform.get_key_translation();
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231 auto m_s = transform.get_key_scale();
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232 double w = static_cast<double>(format_desc_.width);
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233 double h = static_cast<double>(format_desc_.height);
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235 GL(glEnable(GL_SCISSOR_TEST));
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236 GL(glScissor(static_cast<size_t>(m_p[0]*w), static_cast<size_t>(m_p[1]*h), static_cast<size_t>(m_s[0]*w), static_cast<size_t>(m_s[1]*h)));
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238 auto f_p = transform.get_fill_translation();
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239 auto f_s = transform.get_fill_scale();
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242 glMultiTexCoord2d(GL_TEXTURE0, 0.0, 0.0); glMultiTexCoord2d(GL_TEXTURE1, f_p[0] , f_p[1] ); glVertex2d( f_p[0] *2.0-1.0, f_p[1] *2.0-1.0);
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243 glMultiTexCoord2d(GL_TEXTURE0, 1.0, 0.0); glMultiTexCoord2d(GL_TEXTURE1, (f_p[0]+f_s[0]), f_p[1] ); glVertex2d((f_p[0]+f_s[0])*2.0-1.0, f_p[1] *2.0-1.0);
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244 glMultiTexCoord2d(GL_TEXTURE0, 1.0, 1.0); glMultiTexCoord2d(GL_TEXTURE1, (f_p[0]+f_s[0]), (f_p[1]+f_s[1])); glVertex2d((f_p[0]+f_s[0])*2.0-1.0, (f_p[1]+f_s[1])*2.0-1.0);
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245 glMultiTexCoord2d(GL_TEXTURE0, 0.0, 1.0); glMultiTexCoord2d(GL_TEXTURE1, f_p[0] , (f_p[1]+f_s[1])); glVertex2d( f_p[0] *2.0-1.0, (f_p[1]+f_s[1])*2.0-1.0);
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247 GL(glDisable(GL_SCISSOR_TEST));
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250 std::vector<safe_ptr<host_buffer>> create_buffers(const core::pixel_format_desc& format)
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252 std::vector<safe_ptr<host_buffer>> buffers;
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253 std::transform(format.planes.begin(), format.planes.end(), std::back_inserter(buffers), [&](const core::pixel_format_desc::plane& plane)
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255 return ogl_device::create_host_buffer(plane.size, host_buffer::write_only);
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261 image_mixer::image_mixer(const core::video_format_desc& format_desc) : impl_(new implementation(format_desc)){}
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262 void image_mixer::begin(const core::basic_frame& frame){impl_->begin(frame);}
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263 void image_mixer::visit(core::write_frame& frame){impl_->visit(frame);}
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264 void image_mixer::end(){impl_->end();}
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265 boost::unique_future<safe_ptr<const host_buffer>> image_mixer::render(){return impl_->render();}
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266 std::vector<safe_ptr<host_buffer>> image_mixer::create_buffers(const core::pixel_format_desc& format){return impl_->create_buffers(format);}
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