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#include <cstring>
#include <stdexcept>
#include <sys/mman.h>
#include <xf86drm.h>
#include <xf86drmMode.h>
#include <drm_fourcc.h>
#include <drm.h>
#include <drm_mode.h>
#include "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)
{
Create();
}
DumbFramebuffer::~DumbFramebuffer()
{
Destroy();
}
struct FormatPlaneInfo
{
uint8_t bitspp; /* bits per (macro) pixel */
uint8_t xsub;
uint8_t ysub;
};
struct FormatInfo
{
uint8_t num_planes;
struct FormatPlaneInfo planes[4];
};
static const map<PixelFormat, FormatInfo> format_info_array = {
/* YUV packed */
{ PixelFormat::UYVY, { 1, { { 32, 2, 1 } }, } },
{ PixelFormat::YUYV, { 1, { { 32, 2, 1 } }, } },
{ PixelFormat::YVYU, { 1, { { 32, 2, 1 } }, } },
{ PixelFormat::VYUY, { 1, { { 32, 2, 1 } }, } },
/* YUV semi-planar */
{ PixelFormat::NV12, { 2, { { 8, 1, 1, }, { 16, 2, 2 } }, } },
{ PixelFormat::NV21, { 2, { { 8, 1, 1, }, { 16, 2, 2 } }, } },
/* RGB16 */
{ PixelFormat::RGB565, { 1, { { 16, 1, 1 } }, } },
/* RGB32 */
{ PixelFormat::XRGB8888, { 1, { { 32, 1, 1 } }, } },
{ PixelFormat::XBGR8888, { 1, { { 32, 1, 1 } }, } },
{ PixelFormat::ARGB8888, { 1, { { 32, 1, 1 } }, } },
{ PixelFormat::ABGR8888, { 1, { { 32, 1, 1 } }, } },
};
void DumbFramebuffer::Create()
{
int r;
const FormatInfo& format_info = format_info_array.at(m_format);
m_num_planes = format_info.num_planes;
for (int i = 0; i < format_info.num_planes; ++i) {
const FormatPlaneInfo& pi = format_info.planes[i];
FramebufferPlane& plane = m_planes[i];
/* create dumb buffer */
struct drm_mode_create_dumb creq = drm_mode_create_dumb();
creq.width = width() / pi.xsub;
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;
/*
printf("buf %d: %dx%d, bitspp %d, stride %d, size %d\n",
i, creq.width, creq.height, pi->bitspp, plane->stride, plane->size);
*/
/* prepare buffer for memory mapping */
struct drm_mode_map_dumb mreq = drm_mode_map_dumb();
mreq.handle = plane.handle;
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 */
m_planes[i].map = (uint8_t *)mmap(0, plane.size, PROT_READ | PROT_WRITE, MAP_SHARED,
card().fd(), mreq.offset);
if (plane.map == MAP_FAILED)
throw invalid_argument(string("mmap failed: ") + strerror(errno));
/* clear the framebuffer to 0 */
memset(plane.map, 0, plane.size);
}
/* 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);
}
void DumbFramebuffer::Destroy()
{
/* delete framebuffer */
drmModeRmFB(card().fd(), id());
for (uint i = 0; i < m_num_planes; ++i) {
FramebufferPlane& plane = m_planes[i];
/* unmap buffer */
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);
}
}
void DumbFramebuffer::clear()
{
for (unsigned i = 0; i < m_num_planes; ++i)
memset(m_planes[i].map, 0, m_planes[i].size);
}
}
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