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/cast.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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57 std::shared_ptr<host_buffer> reading_;
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59 image_kernel kernel_;
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61 safe_ptr<ogl_device> context_;
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64 implementation(const core::video_format_desc& format_desc)
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65 : format_desc_(format_desc)
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66 , context_(ogl_device::create())
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70 if(!GLEE_VERSION_3_0)
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71 BOOST_THROW_EXCEPTION(not_supported() << msg_info("Missing OpenGL 3.0 support."));
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74 context_->begin_invoke([=]
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76 transform_stack_.push(core::image_transform());
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77 transform_stack_.top().set_mode(core::video_mode::progressive);
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79 GL(glEnable(GL_TEXTURE_2D));
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80 GL(glDisable(GL_DEPTH_TEST));
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82 render_targets_[0] = context_->create_device_buffer(format_desc.width, format_desc.height, 4);
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83 render_targets_[1] = context_->create_device_buffer(format_desc.width, format_desc.height, 4);
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85 GL(glGenFramebuffers(1, &fbo_));
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86 GL(glBindFramebuffer(GL_FRAMEBUFFER_EXT, fbo_));
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87 GL(glReadBuffer(GL_COLOR_ATTACHMENT0_EXT));
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89 reading_ = context_->create_host_buffer(format_desc_.size, host_buffer::read_only);
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95 glDeleteFramebuffersEXT(1, &fbo_);
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98 void begin(const core::basic_frame& frame)
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100 transform_stack_.push(transform_stack_.top()*frame.get_image_transform());
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103 void visit(core::write_frame& frame)
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105 auto gpu_frame = boost::polymorphic_downcast<gpu_write_frame*>(&frame);
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106 auto& desc = gpu_frame->get_pixel_format_desc();
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107 auto& buffers = gpu_frame->get_plane_buffers();
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109 auto transform = transform_stack_.top();
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110 context_->begin_invoke([=]
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112 GL(glColor4d(1.0, 1.0, 1.0, transform.get_opacity()));
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113 GL(glViewport(0, 0, format_desc_.width, format_desc_.height));
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114 kernel_.apply(desc, transform);
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116 std::vector<safe_ptr<device_buffer>> device_buffers;
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117 for(size_t n = 0; n < buffers.size(); ++n)
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119 auto texture = context_->create_device_buffer(desc.planes[n].width, desc.planes[n].height, desc.planes[n].channels);
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120 texture->read(*buffers[n]);
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121 device_buffers.push_back(texture);
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124 for(size_t n = 0; n < buffers.size(); ++n)
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126 GL(glActiveTexture(GL_TEXTURE0+n));
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127 device_buffers[n]->bind();
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130 auto m_p = transform.get_key_translation();
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131 auto m_s = transform.get_key_scale();
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132 double w = static_cast<double>(format_desc_.width);
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133 double h = static_cast<double>(format_desc_.height);
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135 GL(glEnable(GL_SCISSOR_TEST));
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136 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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138 auto f_p = transform.get_fill_translation();
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139 auto f_s = transform.get_fill_scale();
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142 glTexCoord2d(0.0, 0.0); glVertex2d( f_p[0] *2.0-1.0, f_p[1] *2.0-1.0);
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143 glTexCoord2d(1.0, 0.0); glVertex2d((f_p[0]+f_s[0])*2.0-1.0, f_p[1] *2.0-1.0);
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144 glTexCoord2d(1.0, 1.0); 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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145 glTexCoord2d(0.0, 1.0); glVertex2d( f_p[0] *2.0-1.0, (f_p[1]+f_s[1])*2.0-1.0);
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147 GL(glDisable(GL_SCISSOR_TEST));
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153 transform_stack_.pop();
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156 boost::unique_future<safe_ptr<const host_buffer>> begin_pass()
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158 return context_->begin_invoke([=]() -> safe_ptr<const host_buffer>
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160 reading_->map(); // Open host buffer for reading.
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161 render_targets_[0]->attach(0); // Render to the next target
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162 GL(glClear(GL_COLOR_BUFFER_BIT)); // Clear the new target
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163 return make_safe(reading_);
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169 context_->begin_invoke([=]
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171 reading_ = context_->create_host_buffer(format_desc_.size, host_buffer::read_only); // Create a new host buffer.
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172 render_targets_[0]->write(*reading_); // Move data to host buffer.
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173 std::rotate(render_targets_.begin(), render_targets_.begin() + 1, render_targets_.end()); // Set new render target.
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177 std::vector<safe_ptr<host_buffer>> create_buffers(const core::pixel_format_desc& format)
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179 std::vector<safe_ptr<host_buffer>> buffers;
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180 std::transform(format.planes.begin(), format.planes.end(), std::back_inserter(buffers), [&](const core::pixel_format_desc::plane& plane)
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182 return context_->create_host_buffer(plane.size, host_buffer::write_only);
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188 image_mixer::image_mixer(const core::video_format_desc& format_desc) : impl_(new implementation(format_desc)){}
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189 void image_mixer::begin(const core::basic_frame& frame){impl_->begin(frame);}
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190 void image_mixer::visit(core::write_frame& frame){impl_->visit(frame);}
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191 void image_mixer::end(){impl_->end();}
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192 boost::unique_future<safe_ptr<const host_buffer>> image_mixer::begin_pass(){ return impl_->begin_pass();}
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193 void image_mixer::end_pass(){impl_->end_pass();}
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194 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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