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, size_t num_queued_frames, GLenum buffer, GLenum permissions, GLenum map_bits)
  12         : frame_size(frame_size), buffer(buffer)
  13 {
  14         for (size_t i = 0; i < num_queued_frames; ++i) {
  15                 GLuint pbo;
  16                 glGenBuffers(1, &pbo);
  17                 check_error();
  18                 glBindBuffer(buffer, pbo);
  19                 check_error();
  20                 glBufferStorage(buffer, frame_size, NULL, permissions | GL_MAP_PERSISTENT_BIT);
  21                 check_error();
  22
  23                 Frame frame;
  24                 frame.data = (uint8_t *)glMapBufferRange(buffer, 0, frame_size, permissions | map_bits | GL_MAP_PERSISTENT_BIT);
  25                 frame.data2 = frame.data + frame_size / 2;
  26                 check_error();
  27                 frame.size = frame_size;
  28                 frame.userdata = (void *)(intptr_t)pbo;
  29                 frame.owner = this;
  30                 frame.interleaved = true;
  31                 freelist.push(frame);
  32         }
  33         glBindBuffer(buffer, 0);
  34         check_error();
  35 }
  36
  37 PBOFrameAllocator::~PBOFrameAllocator()
  38 {
  39         while (!freelist.empty()) {
  40                 Frame frame = freelist.front();
  41                 freelist.pop();
  42                 GLuint pbo = (intptr_t)frame.userdata;
  43                 glBindBuffer(buffer, pbo);
  44                 check_error();
  45                 glUnmapBuffer(buffer);
  46                 check_error();
  47                 glBindBuffer(buffer, 0);
  48                 check_error();
  49                 glDeleteBuffers(1, &pbo);
  50         }
  51 }
  52 //static int sumsum = 0;
  53
  54 FrameAllocator::Frame PBOFrameAllocator::alloc_frame()
  55 {
  56         Frame vf;
  57
  58         std::unique_lock<std::mutex> lock(freelist_mutex);  // Meh.
  59         if (freelist.empty()) {
  60                 printf("Frame overrun (no more spare PBO frames), dropping frame!\n");
  61         } else {
  62                 //fprintf(stderr, "freelist has %d allocated\n", ++sumsum);
  63                 vf = freelist.front();
  64                 freelist.pop();  // Meh.
  65         }
  66         vf.len = 0;
  67         return vf;
  68 }
  69
  70 void PBOFrameAllocator::release_frame(Frame frame)
  71 {
  72         std::unique_lock<std::mutex> lock(freelist_mutex);
  73         freelist.push(frame);
  74         //--sumsum;
  75 }