git.sesse.net Git - casparcg/blob - accelerator/ogl/util/texture.cpp

   1 /*
   2 * Copyright (c) 2011 Sveriges Television AB <info@casparcg.com>
   3 *
   4 * This file is part of CasparCG (www.casparcg.com).
   5 *
   6 * CasparCG is free software: you can redistribute it and/or modify
   7 * it under the terms of the GNU General Public License as published by
   8 * the Free Software Foundation, either version 3 of the License, or
   9 * (at your option) any later version.
  10 *
  11 * CasparCG is distributed in the hope that it will be useful,
  12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 * GNU General Public License for more details.
  15 *
  16 * You should have received a copy of the GNU General Public License
  17 * along with CasparCG. If not, see <http://www.gnu.org/licenses/>.
  18 *
  19 * Author: Robert Nagy, ronag89@gmail.com
  20 */
  21
  22 #include "../../stdafx.h"
  23
  24 #include "texture.h"
  25
  26 #include "buffer.h"
  27
  28 #include <common/except.h>
  29 #include <common/gl/gl_check.h>
  30
  31 #include <gl/glew.h>
  32
  33 #include <tbb/atomic.h>
  34
  35 #include <boost/thread/future.hpp>
  36
  37 namespace caspar { namespace accelerator { namespace ogl {
  38
  39 static GLenum FORMAT[] = {0, GL_RED, GL_RG, GL_BGR, GL_BGRA};
  40 static GLenum INTERNAL_FORMAT[] = {0, GL_R8, GL_RG8, GL_RGB8, GL_RGBA8};
  41 static GLenum TYPE[] = {0, GL_UNSIGNED_BYTE, GL_UNSIGNED_BYTE, GL_UNSIGNED_BYTE, GL_UNSIGNED_INT_8_8_8_8_REV};
  42
  43 static tbb::atomic<int> g_total_count;
  44
  45 struct texture::impl : boost::noncopyable
  46 {
  47         GLuint  id_;
  48
  49         const int width_;
  50         const int height_;
  51         const int stride_;
  52 public:
  53         impl(int width, int height, int stride)
  54                 : width_(width)
  55                 , height_(height)
  56                 , stride_(stride)
  57         {
  58                 GL(glGenTextures(1, &id_));
  59                 GL(glBindTexture(GL_TEXTURE_2D, id_));
  60                 GL(glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR));
  61                 GL(glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR));
  62                 GL(glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE));
  63                 GL(glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE));
  64                 GL(glTexImage2D(GL_TEXTURE_2D, 0, INTERNAL_FORMAT[stride_], width_, height_, 0, FORMAT[stride_], TYPE[stride_], NULL));
  65                 GL(glBindTexture(GL_TEXTURE_2D, 0));
  66                 //CASPAR_LOG(trace) << "[texture] [" << ++g_total_count << L"] allocated size:" << width*height*stride;
  67         }
  68
  69         ~impl()
  70         {
  71                 glDeleteTextures(1, &id_);
  72         }
  73
  74         void bind()
  75         {
  76                 GL(glBindTexture(GL_TEXTURE_2D, id_));
  77         }
  78
  79         void bind(int index)
  80         {
  81                 GL(glActiveTexture(GL_TEXTURE0+index));
  82                 bind();
  83         }
  84
  85         void unbind()
  86         {
  87                 GL(glBindTexture(GL_TEXTURE_2D, 0));
  88         }
  89
  90         void attach()
  91         {
  92                 GL(glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0 + 0, GL_TEXTURE_2D, id_, 0));
  93         }
  94
  95         void clear()
  96         {
  97                 attach();
  98                 GL(glClear(GL_COLOR_BUFFER_BIT));
  99         }
 100
 101         void copy_from(buffer& source)
 102         {
 103                 source.unmap();
 104                 source.bind();
 105                 GL(glBindTexture(GL_TEXTURE_2D, id_));
 106                 GL(glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, width_, height_, FORMAT[stride_], TYPE[stride_], NULL));
 107                 GL(glBindTexture(GL_TEXTURE_2D, 0));
 108                 source.unbind();
 109                 source.map(); // Just map it back since map will orphan buffer.
 110         }
 111
 112         void copy_to(buffer& dest)
 113         {
 114                 dest.unmap();
 115                 dest.bind();
 116                 GL(glBindTexture(GL_TEXTURE_2D, id_));
 117                 GL(glReadBuffer(GL_COLOR_ATTACHMENT0));
 118                 GL(glReadPixels(0, 0, width_, height_, FORMAT[stride_], TYPE[stride_], NULL));
 119                 GL(glBindTexture(GL_TEXTURE_2D, 0));
 120                 dest.unbind();
 121                 GL(glFlush());
 122         }
 123 };
 124
 125 texture::texture(int width, int height, int stride) : impl_(new impl(width, height, stride)){}
 126 texture::texture(texture&& other) : impl_(std::move(other.impl_)){}
 127 texture::~texture(){}
 128 texture& texture::operator=(texture&& other){impl_ = std::move(other.impl_); return *this;}
 129 void texture::bind(int index){impl_->bind(index);}
 130 void texture::unbind(){impl_->unbind();}
 131 void texture::attach(){impl_->attach();}
 132 void texture::clear(){impl_->clear();}
 133 void texture::copy_from(buffer& source){impl_->copy_from(source);}
 134 void texture::copy_to(buffer& dest){impl_->copy_to(dest);}
 135 int texture::width() const { return impl_->width_; }
 136 int texture::height() const { return impl_->height_; }
 137 int texture::stride() const { return impl_->stride_; }
 138 std::size_t texture::size() const { return static_cast<std::size_t>(impl_->width_*impl_->height_*impl_->stride_); }
 139 int texture::id() const{ return impl_->id_;}
 140
 141 }}}