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                 glTexImage2D(GL_TEXTURE_2D, 0, GL_R8, width, height, 0, GL_RED, GL_UNSIGNED_BYTE, NULL);
  42                 check_error();
  43
  44                 glGenTextures(1, &userdata[i].tex_cbcr);
  45                 check_error();
  46                 glBindTexture(GL_TEXTURE_2D, userdata[i].tex_cbcr);
  47                 check_error();
  48                 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
  49                 check_error();
  50                 glTexImage2D(GL_TEXTURE_2D, 0, GL_RG8, width / 2, height, 0, GL_RG, GL_UNSIGNED_BYTE, NULL);
  51                 check_error();
  52
  53                 freelist.push(frame);
  54         }
  55         glBindBuffer(buffer, 0);
  56         check_error();
  57         glBindTexture(GL_TEXTURE_2D, 0);
  58         check_error();
  59 }
  60
  61 PBOFrameAllocator::~PBOFrameAllocator()
  62 {
  63         while (!freelist.empty()) {
  64                 Frame frame = freelist.front();
  65                 freelist.pop();
  66                 GLuint pbo = ((Userdata *)frame.userdata)->pbo;
  67                 glBindBuffer(buffer, pbo);
  68                 check_error();
  69                 glUnmapBuffer(buffer);
  70                 check_error();
  71                 glBindBuffer(buffer, 0);
  72                 check_error();
  73                 glDeleteBuffers(1, &pbo);
  74                 check_error();
  75                 GLuint tex_y = ((Userdata *)frame.userdata)->tex_y;
  76                 glDeleteTextures(1, &tex_y);
  77                 check_error();
  78                 GLuint tex_cbcr = ((Userdata *)frame.userdata)->tex_cbcr;
  79                 glDeleteTextures(1, &tex_cbcr);
  80                 check_error();
  81         }
  82 }
  83 //static int sumsum = 0;
  84
  85 FrameAllocator::Frame PBOFrameAllocator::alloc_frame()
  86 {
  87         Frame vf;
  88
  89         std::unique_lock<std::mutex> lock(freelist_mutex);  // Meh.
  90         if (freelist.empty()) {
  91                 printf("Frame overrun (no more spare PBO frames), dropping frame!\n");
  92         } else {
  93                 //fprintf(stderr, "freelist has %d allocated\n", ++sumsum);
  94                 vf = freelist.front();
  95                 freelist.pop();  // Meh.
  96         }
  97         vf.len = 0;
  98         return vf;
  99 }
 100
 101 void PBOFrameAllocator::release_frame(Frame frame)
 102 {
 103         std::unique_lock<std::mutex> lock(freelist_mutex);
 104         freelist.push(frame);
 105         //--sumsum;
 106 }