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         : 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. We don't allocate any data for the second field at this point
  36                 // (just create the texture state with the samplers), since our default assumed
  37                 // resolution is progressive.
  38                 glGenTextures(2, userdata[i].tex_y);
  39                 check_error();
  40                 glGenTextures(2, userdata[i].tex_cbcr);
  41                 check_error();
  42                 userdata[i].last_width[0] = width;
  43                 userdata[i].last_height[0] = height;
  44                 userdata[i].last_width[1] = 0;
  45                 userdata[i].last_height[1] = 0;
  46                 for (unsigned field = 0; field < 2; ++field) {
  47                         glBindTexture(GL_TEXTURE_2D, userdata[i].tex_y[field]);
  48                         check_error();
  49                         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
  50                         check_error();
  51                         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
  52                         check_error();
  53                         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
  54                         check_error();
  55                         if (field == 0) {
  56                                 glTexImage2D(GL_TEXTURE_2D, 0, GL_R8, width, height, 0, GL_RED, GL_UNSIGNED_BYTE, NULL);
  57                                 check_error();
  58                         }
  59
  60                         glBindTexture(GL_TEXTURE_2D, userdata[i].tex_cbcr[field]);
  61                         check_error();
  62                         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
  63                         check_error();
  64                         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
  65                         check_error();
  66                         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
  67                         check_error();
  68                         if (field == 0) {
  69                                 glTexImage2D(GL_TEXTURE_2D, 0, GL_RG8, width / 2, height, 0, GL_RG, GL_UNSIGNED_BYTE, NULL);
  70                                 check_error();
  71                         }
  72                 }
  73
  74                 freelist.push(frame);
  75         }
  76         glBindBuffer(buffer, 0);
  77         check_error();
  78         glBindTexture(GL_TEXTURE_2D, 0);
  79         check_error();
  80 }
  81
  82 PBOFrameAllocator::~PBOFrameAllocator()
  83 {
  84         while (!freelist.empty()) {
  85                 Frame frame = freelist.front();
  86                 freelist.pop();
  87                 GLuint pbo = ((Userdata *)frame.userdata)->pbo;
  88                 glBindBuffer(buffer, pbo);
  89                 check_error();
  90                 glUnmapBuffer(buffer);
  91                 check_error();
  92                 glBindBuffer(buffer, 0);
  93                 check_error();
  94                 glDeleteBuffers(1, &pbo);
  95                 check_error();
  96                 glDeleteTextures(2, ((Userdata *)frame.userdata)->tex_y);
  97                 check_error();
  98                 glDeleteTextures(2, ((Userdata *)frame.userdata)->tex_cbcr);
  99                 check_error();
 100         }
 101 }
 102 //static int sumsum = 0;
 103
 104 FrameAllocator::Frame PBOFrameAllocator::alloc_frame()
 105 {
 106         Frame vf;
 107
 108         std::unique_lock<std::mutex> lock(freelist_mutex);  // Meh.
 109         if (freelist.empty()) {
 110                 printf("Frame overrun (no more spare PBO frames), dropping frame!\n");
 111         } else {
 112                 //fprintf(stderr, "freelist has %d allocated\n", ++sumsum);
 113                 vf = freelist.front();
 114                 freelist.pop();  // Meh.
 115         }
 116         vf.len = 0;
 117         vf.overflow = 0;
 118         return vf;
 119 }
 120
 121 void PBOFrameAllocator::release_frame(Frame frame)
 122 {
 123         if (frame.overflow > 0) {
 124                 printf("%d bytes overflow after last (PBO) frame\n", int(frame.overflow));
 125         }
 126
 127         std::unique_lock<std::mutex> lock(freelist_mutex);
 128         freelist.push(frame);
 129         //--sumsum;
 130 }