kms++/src/extframebuffer.cpp

   1
   2 #include <cstring>
   3 #include <cerrno>
   4
   5 #include <stdexcept>
   6 #include <sys/mman.h>
   7 #include <xf86drm.h>
   8 #include <xf86drmMode.h>
   9
  10 #include <kms++/kms++.h>
  11
  12 using namespace std;
  13
  14 namespace kms
  15 {
  16
  17 ExtFramebuffer::ExtFramebuffer(Card& card, uint32_t width, uint32_t height, PixelFormat format,
  18                                vector<uint32_t> handles, vector<uint32_t> pitches, vector<uint32_t> offsets)
  19         : Framebuffer(card, width, height)
  20 {
  21         m_format = format;
  22
  23         const PixelFormatInfo& format_info = get_pixel_format_info(format);
  24
  25         m_num_planes = format_info.num_planes;
  26
  27         for (int i = 0; i < format_info.num_planes; ++i) {
  28                 FramebufferPlane& plane = m_planes[i];
  29
  30                 plane.handle = handles[i];
  31                 plane.prime_fd = 0;
  32
  33                 plane.stride = pitches[i];
  34                 plane.offset = offsets[i];
  35                 plane.size = plane.stride * height;
  36                 plane.map = 0;
  37         }
  38
  39         uint32_t id;
  40         int r = drmModeAddFB2(card.fd(), width, height, (uint32_t)format, handles.data(), pitches.data(), offsets.data(), &id, 0);
  41         if (r)
  42                 throw std::invalid_argument(string("Failed to create ExtFramebuffer: ") + strerror(r));
  43
  44         set_id(id);
  45 }
  46
  47 ExtFramebuffer::ExtFramebuffer(Card& card, uint32_t width, uint32_t height, PixelFormat format,
  48                                vector<int> fds, vector<uint32_t> pitches, vector<uint32_t> offsets)
  49         : Framebuffer(card, width, height)
  50 {
  51         int r;
  52
  53         m_format = format;
  54
  55         const PixelFormatInfo& format_info = get_pixel_format_info(format);
  56
  57         m_num_planes = format_info.num_planes;
  58
  59         for (int i = 0; i < format_info.num_planes; ++i) {
  60                 FramebufferPlane& plane = m_planes[i];
  61
  62                 plane.prime_fd = fds[i];
  63
  64                 r = drmPrimeFDToHandle(card.fd(), fds[i], &plane.handle);
  65                 if (r)
  66                         throw invalid_argument(string("drmPrimeFDToHandle: ") + strerror(errno));
  67
  68                 plane.stride = pitches[i];
  69                 plane.offset = offsets[i];
  70                 plane.size = plane.stride * height;
  71                 plane.map = 0;
  72         }
  73
  74         uint32_t id;
  75         uint32_t bo_handles[4] = { m_planes[0].handle, m_planes[1].handle };
  76         r = drmModeAddFB2(card.fd(), width, height, (uint32_t)format,
  77                           bo_handles, pitches.data(), offsets.data(), &id, 0);
  78         if (r)
  79                 throw invalid_argument(string("drmModeAddFB2 failed: ") + strerror(errno));
  80
  81         set_id(id);
  82 }
  83
  84 ExtFramebuffer::~ExtFramebuffer()
  85 {
  86         drmModeRmFB(card().fd(), id());
  87 }
  88
  89 uint8_t* ExtFramebuffer::map(unsigned plane)
  90 {
  91         FramebufferPlane& p = m_planes[plane];
  92
  93         if (!p.prime_fd)
  94                 throw invalid_argument("cannot mmap non-dmabuf fb");
  95
  96         if (p.map)
  97                 return p.map;
  98
  99         p.map = (uint8_t *)mmap(0, p.size, PROT_READ | PROT_WRITE, MAP_SHARED,
 100                                           p.prime_fd, 0);
 101         if (p.map == MAP_FAILED)
 102                 throw invalid_argument(string("mmap failed: ") + strerror(errno));
 103
 104         return p.map;
 105 }
 106
 107 int ExtFramebuffer::prime_fd(unsigned plane)
 108 {
 109         FramebufferPlane& p = m_planes[plane];
 110
 111         if (!p.prime_fd)
 112                 throw invalid_argument("no primefb for non-dmabuf fb");
 113
 114         return p.prime_fd;
 115 }
 116
 117 }