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                 userdata[i].last_interlaced = false;
  47                 for (unsigned field = 0; field < 2; ++field) {
  48                         glBindTexture(GL_TEXTURE_2D, userdata[i].tex_y[field]);
  49                         check_error();
  50                         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
  51                         check_error();
  52                         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
  53                         check_error();
  54                         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
  55                         check_error();
  56                         if (field == 0) {
  57                                 glTexImage2D(GL_TEXTURE_2D, 0, GL_R8, width, height, 0, GL_RED, GL_UNSIGNED_BYTE, NULL);
  58                                 check_error();
  59                         }
  60
  61                         glBindTexture(GL_TEXTURE_2D, userdata[i].tex_cbcr[field]);
  62                         check_error();
  63                         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
  64                         check_error();
  65                         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
  66                         check_error();
  67                         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
  68                         check_error();
  69                         if (field == 0) {
  70                                 glTexImage2D(GL_TEXTURE_2D, 0, GL_RG8, width / 2, height, 0, GL_RG, GL_UNSIGNED_BYTE, NULL);
  71                                 check_error();
  72                         }
  73                 }
  74
  75                 freelist.push(frame);
  76         }
  77         glBindBuffer(buffer, 0);
  78         check_error();
  79         glBindTexture(GL_TEXTURE_2D, 0);
  80         check_error();
  81 }
  82
  83 PBOFrameAllocator::~PBOFrameAllocator()
  84 {
  85         while (!freelist.empty()) {
  86                 Frame frame = freelist.front();
  87                 freelist.pop();
  88                 GLuint pbo = ((Userdata *)frame.userdata)->pbo;
  89                 glBindBuffer(buffer, pbo);
  90                 check_error();
  91                 glUnmapBuffer(buffer);
  92                 check_error();
  93                 glBindBuffer(buffer, 0);
  94                 check_error();
  95                 glDeleteBuffers(1, &pbo);
  96                 check_error();
  97                 glDeleteTextures(2, ((Userdata *)frame.userdata)->tex_y);
  98                 check_error();
  99                 glDeleteTextures(2, ((Userdata *)frame.userdata)->tex_cbcr);
 100                 check_error();
 101         }
 102 }
 103 //static int sumsum = 0;
 104
 105 FrameAllocator::Frame PBOFrameAllocator::alloc_frame()
 106 {
 107         Frame vf;
 108
 109         unique_lock<mutex> lock(freelist_mutex);  // Meh.
 110         if (freelist.empty()) {
 111                 printf("Frame overrun (no more spare PBO frames), dropping frame!\n");
 112         } else {
 113                 //fprintf(stderr, "freelist has %d allocated\n", ++sumsum);
 114                 vf = freelist.front();
 115                 freelist.pop();  // Meh.
 116         }
 117         vf.len = 0;
 118         vf.overflow = 0;
 119         return vf;
 120 }
 121
 122 void PBOFrameAllocator::release_frame(Frame frame)
 123 {
 124         if (frame.overflow > 0) {
 125                 printf("%d bytes overflow after last (PBO) frame\n", int(frame.overflow));
 126         }
 127
 128         unique_lock<mutex> lock(freelist_mutex);
 129         freelist.push(frame);
 130         //--sumsum;
 131 }