libkms++/dumbframebuffer.cpp

   1
   2 #include <cstring>
   3 #include <stdexcept>
   4 #include <sys/mman.h>
   5 #include <xf86drm.h>
   6 #include <xf86drmMode.h>
   7 #include <drm_fourcc.h>
   8 #include <drm.h>
   9 #include <drm_mode.h>
  10
  11 #include "kms++.h"
  12
  13 #define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]))
  14
  15 using namespace std;
  16
  17 namespace kms
  18 {
  19
  20 DumbFramebuffer::DumbFramebuffer(Card &card, uint32_t width, uint32_t height, const char* fourcc)
  21         :Framebuffer(card, width, height)
  22 {
  23         uint32_t a, b, c, d;
  24         a = fourcc[0];
  25         b = fourcc[1];
  26         c = fourcc[2];
  27         d = fourcc[3];
  28
  29         uint32_t code = ((uint32_t)(a) | ((uint32_t)(b) << 8) | ((uint32_t)(c) << 16) | ((uint32_t)(d) << 24));
  30
  31         Create(width, height, code);
  32 }
  33
  34 DumbFramebuffer::~DumbFramebuffer()
  35 {
  36         Destroy();
  37 }
  38
  39 void DumbFramebuffer::print_short() const
  40 {
  41         printf("DumbFramebuffer %d\n", id());
  42 }
  43
  44 struct FormatPlaneInfo
  45 {
  46         uint8_t bitspp; /* bits per (macro) pixel */
  47         uint8_t xsub;
  48         uint8_t ysub;
  49 };
  50
  51 struct FormatInfo
  52 {
  53         uint32_t format;
  54         uint8_t num_planes;
  55         struct FormatPlaneInfo planes[4];
  56 };
  57
  58 static const FormatInfo format_info_array[] = {
  59         /* YUV packed */
  60         { DRM_FORMAT_UYVY, 1, { { 32, 2, 1 } }, },
  61         { DRM_FORMAT_YUYV, 1, { { 32, 2, 1 } }, },
  62         /* YUV semi-planar */
  63         { DRM_FORMAT_NV12, 2, { { 8, 1, 1, }, { 16, 2, 2 } }, },
  64         /* RGB16 */
  65         { DRM_FORMAT_RGB565, 1, { { 16, 1, 1 } }, },
  66         /* RGB32 */
  67         { DRM_FORMAT_XRGB8888, 1, { { 32, 1, 1 } }, },
  68 };
  69
  70 static const FormatInfo& find_format(uint32_t format)
  71 {
  72         for (uint i = 0; i < ARRAY_SIZE(format_info_array); ++i) {
  73                 if (format == format_info_array[i].format)
  74                         return format_info_array[i];
  75         }
  76
  77         throw std::invalid_argument("foo");
  78 }
  79
  80 void DumbFramebuffer::Create(uint32_t width, uint32_t height, uint32_t format)
  81 {
  82         int r;
  83
  84         m_format = format;
  85
  86         const FormatInfo& format_info = find_format(format);
  87
  88         m_num_planes = format_info.num_planes;
  89
  90         for (int i = 0; i < format_info.num_planes; ++i) {
  91                 const FormatPlaneInfo& pi = format_info.planes[i];
  92                 FramebufferPlane& plane = m_planes[i];
  93
  94                 /* create dumb buffer */
  95                 struct drm_mode_create_dumb creq = drm_mode_create_dumb();
  96                 creq.width = width / pi.xsub;
  97                 creq.height = height / pi.ysub;
  98                 creq.bpp = pi.bitspp;
  99                 r = drmIoctl(card().fd(), DRM_IOCTL_MODE_CREATE_DUMB, &creq);
 100                 if (r)
 101                         throw std::invalid_argument("foo");
 102
 103                 plane.handle = creq.handle;
 104                 plane.stride = creq.pitch;
 105                 plane.size = creq.height * creq.pitch;
 106
 107                 /*
 108                 printf("buf %d: %dx%d, bitspp %d, stride %d, size %d\n",
 109                         i, creq.width, creq.height, pi->bitspp, plane->stride, plane->size);
 110                 */
 111
 112                 /* prepare buffer for memory mapping */
 113                 struct drm_mode_map_dumb mreq = drm_mode_map_dumb();
 114                 mreq.handle = plane.handle;
 115                 r = drmIoctl(card().fd(), DRM_IOCTL_MODE_MAP_DUMB, &mreq);
 116                 if (r)
 117                         throw std::invalid_argument("foo");
 118
 119                 /* perform actual memory mapping */
 120                 m_planes[i].map = (uint8_t *)mmap(0, plane.size, PROT_READ | PROT_WRITE, MAP_SHARED,
 121                                                   card().fd(), mreq.offset);
 122                 if (plane.map == MAP_FAILED)
 123                         throw std::invalid_argument("foo");
 124
 125                 /* clear the framebuffer to 0 */
 126                 memset(plane.map, 0, plane.size);
 127         }
 128
 129         /* create framebuffer object for the dumb-buffer */
 130         uint32_t bo_handles[4] = { m_planes[0].handle, m_planes[1].handle };
 131         uint32_t pitches[4] = { m_planes[0].stride, m_planes[1].stride };
 132         uint32_t offsets[4] = { 0 };
 133         uint32_t id;
 134         r = drmModeAddFB2(card().fd(), width, height, format,
 135                           bo_handles, pitches, offsets, &id, 0);
 136         if (r)
 137                 throw std::invalid_argument("foo");
 138
 139         set_id(id);
 140 }
 141
 142 void DumbFramebuffer::Destroy()
 143 {
 144         /* delete framebuffer */
 145         drmModeRmFB(card().fd(), id());
 146
 147         for (uint i = 0; i < m_num_planes; ++i) {
 148                 FramebufferPlane& plane = m_planes[i];
 149
 150                 /* unmap buffer */
 151                 munmap(plane.map, plane.size);
 152
 153                 /* delete dumb buffer */
 154                 struct drm_mode_destroy_dumb dreq = drm_mode_destroy_dumb();
 155                 dreq.handle = plane.handle;
 156                 drmIoctl(card().fd(), DRM_IOCTL_MODE_DESTROY_DUMB, &dreq);
 157
 158         }
 159 }
 160
 161 void DumbFramebuffer::clear()
 162 {
 163         for (unsigned i = 0; i < m_num_planes; ++i)
 164                 memset(m_planes[i].map, 0, m_planes[i].size);
 165 }
 166
 167 }