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

   1 #include "pbo_frame_allocator.h"
   2 #include "util.h"
   3
   4 using namespace std;
   5
   6 PBOFrameAllocator::PBOFrameAllocator(size_t frame_size, size_t num_queued_frames, GLenum buffer, GLenum permissions, GLenum map_bits)
   7         : frame_size(frame_size), buffer(buffer)
   8 {
   9         for (size_t i = 0; i < num_queued_frames; ++i) {
  10                 GLuint pbo;
  11                 glGenBuffers(1, &pbo);
  12                 check_error();
  13                 glBindBuffer(buffer, pbo);
  14                 check_error();
  15                 glBufferStorage(buffer, frame_size, NULL, permissions | GL_MAP_PERSISTENT_BIT);
  16                 check_error();
  17
  18                 Frame frame;
  19                 frame.data = (uint8_t *)glMapBufferRange(buffer, 0, frame_size, permissions | map_bits | GL_MAP_PERSISTENT_BIT);
  20                 frame.data2 = frame.data + frame_size / 2;
  21                 check_error();
  22                 frame.size = frame_size;
  23                 frame.userdata = (void *)(intptr_t)pbo;
  24                 frame.owner = this;
  25                 frame.interleaved = true;
  26                 freelist.push(frame);
  27         }
  28         glBindBuffer(buffer, 0);
  29         check_error();
  30 }
  31
  32 PBOFrameAllocator::~PBOFrameAllocator()
  33 {
  34         while (!freelist.empty()) {
  35                 Frame frame = freelist.front();
  36                 freelist.pop();
  37                 GLuint pbo = (intptr_t)frame.userdata;
  38                 glBindBuffer(buffer, pbo);
  39                 check_error();
  40                 glUnmapBuffer(buffer);
  41                 check_error();
  42                 glBindBuffer(buffer, 0);
  43                 check_error();
  44                 glDeleteBuffers(1, &pbo);
  45         }
  46 }
  47 //static int sumsum = 0;
  48
  49 FrameAllocator::Frame PBOFrameAllocator::alloc_frame()
  50 {
  51         Frame vf;
  52
  53         std::unique_lock<std::mutex> lock(freelist_mutex);  // Meh.
  54         if (freelist.empty()) {
  55                 printf("Frame overrun (no more spare PBO frames), dropping frame!\n");
  56         } else {
  57                 //fprintf(stderr, "freelist has %d allocated\n", ++sumsum);
  58                 vf = freelist.front();
  59                 freelist.pop();  // Meh.
  60         }
  61         vf.len = 0;
  62         return vf;
  63 }
  64
  65 void PBOFrameAllocator::release_frame(Frame frame)
  66 {
  67         std::unique_lock<std::mutex> lock(freelist_mutex);
  68         freelist.push(frame);
  69         //--sumsum;
  70 }