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

   1 #include "pbo_frame_allocator.h"
   2
   3 #include <stdbool.h>
   4 #include <stdint.h>
   5 #include <stdio.h>
   6 #include <cstddef>
   7
   8 #include "util.h"
   9
  10 using namespace std;
  11
  12 PBOFrameAllocator::PBOFrameAllocator(size_t frame_size, GLuint width, GLuint height, size_t num_queued_frames, GLenum buffer, GLenum permissions, GLenum map_bits)
  13         : frame_size(frame_size), buffer(buffer)
  14 {
  15         userdata.reset(new Userdata[num_queued_frames]);
  16         for (size_t i = 0; i < num_queued_frames; ++i) {
  17                 GLuint pbo;
  18                 glGenBuffers(1, &pbo);
  19                 check_error();
  20                 glBindBuffer(buffer, pbo);
  21                 check_error();
  22                 glBufferStorage(buffer, frame_size, NULL, permissions | GL_MAP_PERSISTENT_BIT);
  23                 check_error();
  24
  25                 Frame frame;
  26                 frame.data = (uint8_t *)glMapBufferRange(buffer, 0, frame_size, permissions | map_bits | GL_MAP_PERSISTENT_BIT);
  27                 frame.data2 = frame.data + frame_size / 2;
  28                 check_error();
  29                 frame.size = frame_size;
  30                 frame.userdata = &userdata[i];
  31                 userdata[i].pbo = pbo;
  32                 frame.owner = this;
  33                 frame.interleaved = true;
  34
  35                 // Create textures.
  36                 glGenTextures(1, &userdata[i].tex_y);
  37                 check_error();
  38                 glBindTexture(GL_TEXTURE_2D, userdata[i].tex_y);
  39                 check_error();
  40                 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
  41                 check_error();
  42                 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
  43                 check_error();
  44                 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
  45                 check_error();
  46                 glTexImage2D(GL_TEXTURE_2D, 0, GL_R8, width, height, 0, GL_RED, GL_UNSIGNED_BYTE, NULL);
  47                 check_error();
  48
  49                 glGenTextures(1, &userdata[i].tex_cbcr);
  50                 check_error();
  51                 glBindTexture(GL_TEXTURE_2D, userdata[i].tex_cbcr);
  52                 check_error();
  53                 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
  54                 check_error();
  55                 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
  56                 check_error();
  57                 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
  58                 check_error();
  59                 glTexImage2D(GL_TEXTURE_2D, 0, GL_RG8, width / 2, height, 0, GL_RG, GL_UNSIGNED_BYTE, NULL);
  60                 check_error();
  61
  62                 freelist.push(frame);
  63         }
  64         glBindBuffer(buffer, 0);
  65         check_error();
  66         glBindTexture(GL_TEXTURE_2D, 0);
  67         check_error();
  68 }
  69
  70 PBOFrameAllocator::~PBOFrameAllocator()
  71 {
  72         while (!freelist.empty()) {
  73                 Frame frame = freelist.front();
  74                 freelist.pop();
  75                 GLuint pbo = ((Userdata *)frame.userdata)->pbo;
  76                 glBindBuffer(buffer, pbo);
  77                 check_error();
  78                 glUnmapBuffer(buffer);
  79                 check_error();
  80                 glBindBuffer(buffer, 0);
  81                 check_error();
  82                 glDeleteBuffers(1, &pbo);
  83                 check_error();
  84                 GLuint tex_y = ((Userdata *)frame.userdata)->tex_y;
  85                 glDeleteTextures(1, &tex_y);
  86                 check_error();
  87                 GLuint tex_cbcr = ((Userdata *)frame.userdata)->tex_cbcr;
  88                 glDeleteTextures(1, &tex_cbcr);
  89                 check_error();
  90         }
  91 }
  92 //static int sumsum = 0;
  93
  94 FrameAllocator::Frame PBOFrameAllocator::alloc_frame()
  95 {
  96         Frame vf;
  97
  98         std::unique_lock<std::mutex> lock(freelist_mutex);  // Meh.
  99         if (freelist.empty()) {
 100                 printf("Frame overrun (no more spare PBO frames), dropping frame!\n");
 101         } else {
 102                 //fprintf(stderr, "freelist has %d allocated\n", ++sumsum);
 103                 vf = freelist.front();
 104                 freelist.pop();  // Meh.
 105         }
 106         vf.len = 0;
 107         vf.overflow = 0;
 108         return vf;
 109 }
 110
 111 void PBOFrameAllocator::release_frame(Frame frame)
 112 {
 113         if (frame.overflow > 0) {
 114                 printf("%d bytes overflow after last (PBO) frame\n", int(frame.overflow));
 115         }
 116
 117         std::unique_lock<std::mutex> lock(freelist_mutex);
 118         freelist.push(frame);
 119         //--sumsum;
 120 }