1 #include "../stdafx.h"
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3 #include "image_mixer.h"
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4 #include "image_kernel.h"
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5 #include "image_transform.h"
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7 #include "../gpu/ogl_device.h"
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8 #include "../gpu/host_buffer.h"
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9 #include "../gpu/device_buffer.h"
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11 #include <common/exception/exceptions.h>
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12 #include <common/gl/gl_check.h>
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13 #include <common/concurrency/executor.h>
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16 #include <SFML/Window/Context.hpp>
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17 #include <unordered_map>
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19 namespace caspar { namespace core {
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21 struct image_mixer::implementation : boost::noncopyable
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23 const video_format_desc format_desc_;
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25 std::stack<image_transform> transform_stack_;
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28 std::array<std::shared_ptr<device_buffer>, 2> render_targets_;
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30 std::shared_ptr<host_buffer> reading_;
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32 image_kernel kernel_;
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34 safe_ptr<ogl_device> context_;
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37 implementation(const video_format_desc& format_desc)
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38 : format_desc_(format_desc)
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39 , context_(ogl_device::create())
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41 context_->begin_invoke([=]
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43 transform_stack_.push(image_transform());
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44 transform_stack_.top().set_mode(video_mode::progressive);
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46 GL(glEnable(GL_TEXTURE_2D));
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47 GL(glEnable(GL_SCISSOR_TEST));
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48 GL(glDisable(GL_DEPTH_TEST));
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50 render_targets_[0] = context_->create_device_buffer(format_desc.width, format_desc.height, 4);
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51 render_targets_[1] = context_->create_device_buffer(format_desc.width, format_desc.height, 4);
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53 GL(glGenFramebuffers(1, &fbo_));
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54 GL(glBindFramebuffer(GL_FRAMEBUFFER_EXT, fbo_));
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55 GL(glReadBuffer(GL_COLOR_ATTACHMENT0_EXT));
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57 reading_ = context_->create_host_buffer(format_desc_.size, host_buffer::read_only);
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63 glDeleteFramebuffersEXT(1, &fbo_);
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66 void begin(const image_transform& transform)
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68 transform_stack_.push(transform_stack_.top()*transform);
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71 void render(const pixel_format_desc& desc, std::vector<safe_ptr<host_buffer>>& buffers)
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73 auto transform = transform_stack_.top();
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74 context_->begin_invoke([=]
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76 GL(glColor4d(1.0, 1.0, 1.0, transform.get_opacity()));
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77 GL(glViewport(0, 0, format_desc_.width, format_desc_.height));
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78 kernel_.apply(desc.pix_fmt, transform);
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80 std::vector<safe_ptr<device_buffer>> device_buffers;
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81 for(size_t n = 0; n < buffers.size(); ++n)
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83 auto texture = context_->create_device_buffer(desc.planes[n].width, desc.planes[n].height, desc.planes[n].channels);
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84 texture->read(*buffers[n]);
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85 device_buffers.push_back(texture);
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88 for(size_t n = 0; n < buffers.size(); ++n)
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90 GL(glActiveTexture(GL_TEXTURE0+n));
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91 device_buffers[n]->bind();
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94 auto m_p = transform.get_mask_translation();
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95 auto m_s = transform.get_mask_scale();
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96 double w = static_cast<double>(format_desc_.width);
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97 double h = static_cast<double>(format_desc_.height);
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99 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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101 auto f_p = transform.get_image_translation();
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102 auto f_s = transform.get_image_scale();
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105 glTexCoord2d(0.0, 0.0); glVertex2d( f_p[0] *2.0-1.0, f_p[1] *2.0-1.0);
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106 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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107 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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108 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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111 GL(glScissor(0, 0, format_desc_.width, format_desc_.height));
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117 transform_stack_.pop();
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120 boost::unique_future<safe_ptr<const host_buffer>> begin_pass()
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122 return context_->begin_invoke([=]() -> safe_ptr<const host_buffer>
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125 render_targets_[0]->attach(0);
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126 GL(glClear(GL_COLOR_BUFFER_BIT));
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127 return safe_ptr<const host_buffer>(reading_);
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133 context_->begin_invoke([=]
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135 reading_ = context_->create_host_buffer(format_desc_.size, host_buffer::read_only);
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136 render_targets_[0]->write(*reading_);
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137 std::rotate(render_targets_.begin(), render_targets_.begin() + 1, render_targets_.end());
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141 std::vector<safe_ptr<host_buffer>> create_buffers(const pixel_format_desc& format)
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143 std::vector<safe_ptr<host_buffer>> buffers;
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144 std::transform(format.planes.begin(), format.planes.end(), std::back_inserter(buffers), [&](const pixel_format_desc::plane& plane) -> safe_ptr<host_buffer>
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146 return context_->create_host_buffer(plane.size, host_buffer::write_only);
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152 image_mixer::image_mixer(const video_format_desc& format_desc) : impl_(new implementation(format_desc)){}
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153 void image_mixer::begin(const image_transform& transform) { impl_->begin(transform);}
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154 void image_mixer::process(const pixel_format_desc& desc, std::vector<safe_ptr<host_buffer>>& buffers){ impl_->render(desc, buffers);}
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155 void image_mixer::end(){impl_->end();}
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156 boost::unique_future<safe_ptr<const host_buffer>> image_mixer::begin_pass(){ return impl_->begin_pass();}
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157 void image_mixer::end_pass(){impl_->end_pass();}
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158 std::vector<safe_ptr<host_buffer>> image_mixer::create_buffers(const pixel_format_desc& format){return impl_->create_buffers(format);}
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