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#include <cstring>
#include <cerrno>
#include <stdexcept>
#include <sys/mman.h>
#include <xf86drm.h>
#include <xf86drmMode.h>
#include <fcntl.h>
#include <unistd.h>
#include <drm_fourcc.h>
#include <drm.h>
#include <drm_mode.h>
#include <kms++/kms++.h>
#define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]))
using namespace std;
namespace kms
{
DumbFramebuffer::DumbFramebuffer(Card &card, uint32_t width, uint32_t height, const string& fourcc)
:DumbFramebuffer(card, width, height, FourCCToPixelFormat(fourcc))
{
}
DumbFramebuffer::DumbFramebuffer(Card& card, uint32_t width, uint32_t height, PixelFormat format)
:Framebuffer(card, width, height), m_format(format)
{
int r;
const PixelFormatInfo& format_info = get_pixel_format_info(m_format);
m_num_planes = format_info.num_planes;
for (int i = 0; i < format_info.num_planes; ++i) {
const PixelFormatPlaneInfo& pi = format_info.planes[i];
FramebufferPlane& plane = m_planes.at(i);
/* create dumb buffer */
struct drm_mode_create_dumb creq = drm_mode_create_dumb();
creq.width = width;
creq.height = height / pi.ysub;
creq.bpp = pi.bitspp;
r = drmIoctl(card.fd(), DRM_IOCTL_MODE_CREATE_DUMB, &creq);
if (r)
throw invalid_argument(string("DRM_IOCTL_MODE_CREATE_DUMB failed: ") + strerror(errno));
plane.handle = creq.handle;
plane.stride = creq.pitch;
plane.size = creq.height * creq.pitch;
plane.offset = 0;
plane.map = 0;
plane.prime_fd = -1;
}
/* create framebuffer object for the dumb-buffer */
uint32_t bo_handles[4] = { m_planes[0].handle, m_planes[1].handle };
uint32_t pitches[4] = { m_planes[0].stride, m_planes[1].stride };
uint32_t offsets[4] = { m_planes[0].offset, m_planes[1].offset };
uint32_t id;
r = drmModeAddFB2(card.fd(), width, height, (uint32_t)format,
bo_handles, pitches, offsets, &id, 0);
if (r)
throw invalid_argument(string("drmModeAddFB2 failed: ") + strerror(errno));
set_id(id);
}
DumbFramebuffer::~DumbFramebuffer()
{
/* delete framebuffer */
drmModeRmFB(card().fd(), id());
for (uint i = 0; i < m_num_planes; ++i) {
FramebufferPlane& plane = m_planes.at(i);
/* unmap buffer */
if (plane.map)
munmap(plane.map, plane.size);
/* delete dumb buffer */
struct drm_mode_destroy_dumb dreq = drm_mode_destroy_dumb();
dreq.handle = plane.handle;
drmIoctl(card().fd(), DRM_IOCTL_MODE_DESTROY_DUMB, &dreq);
if (plane.prime_fd >= 0)
::close(plane.prime_fd);
}
}
uint8_t* DumbFramebuffer::map(unsigned plane)
{
FramebufferPlane& p = m_planes.at(plane);
if (p.map)
return p.map;
/* prepare buffer for memory mapping */
struct drm_mode_map_dumb mreq = drm_mode_map_dumb();
mreq.handle = p.handle;
int r = drmIoctl(card().fd(), DRM_IOCTL_MODE_MAP_DUMB, &mreq);
if (r)
throw invalid_argument(string("DRM_IOCTL_MODE_MAP_DUMB failed: ") + strerror(errno));
/* perform actual memory mapping */
p.map = (uint8_t *)mmap(0, p.size, PROT_READ | PROT_WRITE, MAP_SHARED,
card().fd(), mreq.offset);
if (p.map == MAP_FAILED)
throw invalid_argument(string("mmap failed: ") + strerror(errno));
return p.map;
}
int DumbFramebuffer::prime_fd(unsigned int plane)
{
if (m_planes.at(plane).prime_fd >= 0)
return m_planes.at(plane).prime_fd;
int r = drmPrimeHandleToFD(card().fd(), m_planes.at(plane).handle,
DRM_CLOEXEC | O_RDWR, &m_planes.at(plane).prime_fd);
if (r)
throw std::runtime_error("drmPrimeHandleToFD failed");
return m_planes.at(plane).prime_fd;
}
}
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