git.sesse.net Git - nageru/blob - pbo_frame_allocator.cpp

   1 #include "pbo_frame_allocator.h"
   2
   3 #include <stdint.h>
   4 #include <stdio.h>
   5 #include <cstddef>
   6
   7 #include "util.h"
   8
   9 using namespace std;
  10
  11 PBOFrameAllocator::PBOFrameAllocator(size_t frame_size, GLuint width, GLuint height, size_t num_queued_frames, GLenum buffer, GLenum permissions, GLenum map_bits)
  12         : frame_size(frame_size), buffer(buffer)
  13 {
  14         userdata.reset(new Userdata[num_queued_frames]);
  15         for (size_t i = 0; i < num_queued_frames; ++i) {
  16                 GLuint pbo;
  17                 glGenBuffers(1, &pbo);
  18                 check_error();
  19                 glBindBuffer(buffer, pbo);
  20                 check_error();
  21                 glBufferStorage(buffer, frame_size, NULL, permissions | GL_MAP_PERSISTENT_BIT);
  22                 check_error();
  23
  24                 Frame frame;
  25                 frame.data = (uint8_t *)glMapBufferRange(buffer, 0, frame_size, permissions | map_bits | GL_MAP_PERSISTENT_BIT);
  26                 frame.data2 = frame.data + frame_size / 2;
  27                 check_error();
  28                 frame.size = frame_size;
  29                 frame.userdata = &userdata[i];
  30                 userdata[i].pbo = pbo;
  31                 frame.owner = this;
  32                 frame.interleaved = true;
  33
  34                 // Create textures.
  35                 glGenTextures(1, &userdata[i].tex_y);
  36                 check_error();
  37                 glBindTexture(GL_TEXTURE_2D, userdata[i].tex_y);
  38                 check_error();
  39                 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
  40                 check_error();
  41                 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
  42                 check_error();
  43                 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
  44                 check_error();
  45                 glTexImage2D(GL_TEXTURE_2D, 0, GL_R8, width, height, 0, GL_RED, GL_UNSIGNED_BYTE, NULL);
  46                 check_error();
  47
  48                 glGenTextures(1, &userdata[i].tex_cbcr);
  49                 check_error();
  50                 glBindTexture(GL_TEXTURE_2D, userdata[i].tex_cbcr);
  51                 check_error();
  52                 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
  53                 check_error();
  54                 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
  55                 check_error();
  56                 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
  57                 check_error();
  58                 glTexImage2D(GL_TEXTURE_2D, 0, GL_RG8, width / 2, height, 0, GL_RG, GL_UNSIGNED_BYTE, NULL);
  59                 check_error();
  60
  61                 freelist.push(frame);
  62         }
  63         glBindBuffer(buffer, 0);
  64         check_error();
  65         glBindTexture(GL_TEXTURE_2D, 0);
  66         check_error();
  67 }
  68
  69 PBOFrameAllocator::~PBOFrameAllocator()
  70 {
  71         while (!freelist.empty()) {
  72                 Frame frame = freelist.front();
  73                 freelist.pop();
  74                 GLuint pbo = ((Userdata *)frame.userdata)->pbo;
  75                 glBindBuffer(buffer, pbo);
  76                 check_error();
  77                 glUnmapBuffer(buffer);
  78                 check_error();
  79                 glBindBuffer(buffer, 0);
  80                 check_error();
  81                 glDeleteBuffers(1, &pbo);
  82                 check_error();
  83                 GLuint tex_y = ((Userdata *)frame.userdata)->tex_y;
  84                 glDeleteTextures(1, &tex_y);
  85                 check_error();
  86                 GLuint tex_cbcr = ((Userdata *)frame.userdata)->tex_cbcr;
  87                 glDeleteTextures(1, &tex_cbcr);
  88                 check_error();
  89         }
  90 }
  91 //static int sumsum = 0;
  92
  93 FrameAllocator::Frame PBOFrameAllocator::alloc_frame()
  94 {
  95         Frame vf;
  96
  97         std::unique_lock<std::mutex> lock(freelist_mutex);  // Meh.
  98         if (freelist.empty()) {
  99                 printf("Frame overrun (no more spare PBO frames), dropping frame!\n");
 100         } else {
 101                 //fprintf(stderr, "freelist has %d allocated\n", ++sumsum);
 102                 vf = freelist.front();
 103                 freelist.pop();  // Meh.
 104         }
 105         vf.len = 0;
 106         return vf;
 107 }
 108
 109 void PBOFrameAllocator::release_frame(Frame frame)
 110 {
 111         std::unique_lock<std::mutex> lock(freelist_mutex);
 112         freelist.push(frame);
 113         //--sumsum;
 114 }