kms++/src/extframebuffer.cpp

   1
   2 #include <cstring>
   3 #include <stdexcept>
   4 #include <sys/mman.h>
   5 #include <xf86drm.h>
   6 #include <xf86drmMode.h>
   7
   8 #include <kms++/kms++.h>
   9
  10 using namespace std;
  11
  12 namespace kms
  13 {
  14
  15 ExtFramebuffer::ExtFramebuffer(Card& card, uint32_t width, uint32_t height, PixelFormat format,
  16                                vector<uint32_t> handles, vector<uint32_t> pitches, vector<uint32_t> offsets)
  17         : Framebuffer(card, width, height)
  18 {
  19         m_format = format;
  20
  21         const PixelFormatInfo& format_info = get_pixel_format_info(format);
  22
  23         m_num_planes = format_info.num_planes;
  24
  25         for (int i = 0; i < format_info.num_planes; ++i) {
  26                 FramebufferPlane& plane = m_planes[i];
  27
  28                 plane.handle = handles[i];
  29                 plane.prime_fd = 0;
  30
  31                 plane.stride = pitches[i];
  32                 plane.offset = offsets[i];
  33                 plane.size = plane.stride * height;
  34                 plane.map = 0;
  35         }
  36
  37         uint32_t id;
  38         int r = drmModeAddFB2(card.fd(), width, height, (uint32_t)format, handles.data(), pitches.data(), offsets.data(), &id, 0);
  39         if (r)
  40                 throw std::invalid_argument(string("Failed to create ExtFramebuffer: ") + strerror(r));
  41
  42         set_id(id);
  43 }
  44
  45 ExtFramebuffer::ExtFramebuffer(Card& card, uint32_t width, uint32_t height, PixelFormat format,
  46                                vector<int> fds, vector<uint32_t> pitches, vector<uint32_t> offsets)
  47         : Framebuffer(card, width, height)
  48 {
  49         int r;
  50
  51         m_format = format;
  52
  53         const PixelFormatInfo& format_info = get_pixel_format_info(format);
  54
  55         m_num_planes = format_info.num_planes;
  56
  57         for (int i = 0; i < format_info.num_planes; ++i) {
  58                 FramebufferPlane& plane = m_planes[i];
  59
  60                 plane.prime_fd = fds[i];
  61
  62                 r = drmPrimeFDToHandle(card.fd(), fds[i], &plane.handle);
  63                 if (r)
  64                         throw invalid_argument(string("drmPrimeFDToHandle: ") + strerror(errno));
  65
  66                 plane.stride = pitches[i];
  67                 plane.offset = offsets[i];
  68                 plane.size = plane.stride * height;
  69                 plane.map = 0;
  70         }
  71
  72         uint32_t id;
  73         uint32_t bo_handles[4] = { m_planes[0].handle, m_planes[1].handle };
  74         r = drmModeAddFB2(card.fd(), width, height, (uint32_t)format,
  75                           bo_handles, pitches.data(), offsets.data(), &id, 0);
  76         if (r)
  77                 throw invalid_argument(string("drmModeAddFB2 failed: ") + strerror(errno));
  78
  79         set_id(id);
  80 }
  81
  82 ExtFramebuffer::~ExtFramebuffer()
  83 {
  84         drmModeRmFB(card().fd(), id());
  85 }
  86
  87 uint8_t* ExtFramebuffer::map(unsigned plane)
  88 {
  89         FramebufferPlane& p = m_planes[plane];
  90
  91         if (!p.prime_fd)
  92                 throw invalid_argument("cannot mmap non-dmabuf fb");
  93
  94         if (p.map)
  95                 return p.map;
  96
  97         p.map = (uint8_t *)mmap(0, p.size, PROT_READ | PROT_WRITE, MAP_SHARED,
  98                                           p.prime_fd, 0);
  99         if (p.map == MAP_FAILED)
 100                 throw invalid_argument(string("mmap failed: ") + strerror(errno));
 101
 102         return p.map;
 103 }
 104
 105 int ExtFramebuffer::prime_fd(unsigned plane)
 106 {
 107         FramebufferPlane& p = m_planes[plane];
 108
 109         if (!p.prime_fd)
 110                 throw invalid_argument("no primefb for non-dmabuf fb");
 111
 112         return p.prime_fd;
 113 }
 114
 115 }