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 "device_buffer.h"
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24 #include <common/gl/gl_check.h>
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26 namespace caspar { namespace core {
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28 GLenum FORMAT[] = {0, GL_LUMINANCE, GL_LUMINANCE_ALPHA, GL_BGR, GL_BGRA};
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29 GLenum INTERNAL_FORMAT[] = {0, GL_LUMINANCE8, GL_LUMINANCE8_ALPHA8, GL_RGB8, GL_RGBA8};
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31 struct device_buffer::implementation : boost::noncopyable
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35 const size_t width_;
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36 const size_t height_;
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37 const size_t stride_;
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40 implementation(size_t width, size_t height, size_t stride)
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45 GL(glGenTextures(1, &id_));
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46 GL(glBindTexture(GL_TEXTURE_2D, id_));
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47 GL(glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR));
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48 GL(glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR));
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49 GL(glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE));
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50 GL(glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE));
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51 GL(glTexImage2D(GL_TEXTURE_2D, 0, INTERNAL_FORMAT[stride_], width_, height_, 0, FORMAT[stride_], GL_UNSIGNED_BYTE, NULL));
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52 GL(glBindTexture(GL_TEXTURE_2D, 0));
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53 CASPAR_LOG(trace) << "[device_buffer] allocated size:" << width*height*stride;
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58 GL(glDeleteTextures(1, &id_));
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63 GL(glBindTexture(GL_TEXTURE_2D, id_));
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66 void bind(int index)
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68 GL(glActiveTexture(GL_TEXTURE0+index));
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74 GL(glBindTexture(GL_TEXTURE_2D, 0));
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77 void read(host_buffer& source)
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79 GL(glBindTexture(GL_TEXTURE_2D, id_));
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82 GL(glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, width_, height_, FORMAT[stride_], GL_UNSIGNED_BYTE, NULL));
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84 GL(glBindTexture(GL_TEXTURE_2D, 0));
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87 void write(host_buffer& target)
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90 GL(glBindTexture(GL_TEXTURE_2D, id_));
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93 GL(glReadPixels(0, 0, width_, height_, FORMAT[stride_], GL_UNSIGNED_BYTE, NULL));
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95 GL(glBindTexture(GL_TEXTURE_2D, 0));
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98 void attach(int index)
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100 GL(glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0 + index, GL_TEXTURE_2D, id_, 0));
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106 GL(glClear(GL_COLOR_BUFFER_BIT));
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110 device_buffer::device_buffer(size_t width, size_t height, size_t stride) : impl_(new implementation(width, height, stride)){}
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111 size_t device_buffer::stride() const { return impl_->stride_; }
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112 size_t device_buffer::width() const { return impl_->width_; }
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113 size_t device_buffer::height() const { return impl_->height_; }
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114 void device_buffer::attach(int index){impl_->attach(index);}
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115 void device_buffer::bind(){impl_->bind();}
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116 void device_buffer::bind(int index){impl_->bind(index);}
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117 void device_buffer::unbind(){impl_->unbind();}
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118 void device_buffer::read(host_buffer& source){impl_->read(source);}
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119 void device_buffer::write(host_buffer& target){impl_->write(target);}
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120 void device_buffer::clear(){impl_->clear();}
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