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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 char* fourcc)
:Framebuffer(card, width, height)
{
uint32_t a, b, c, d;
a = fourcc[0];
b = fourcc[1];
c = fourcc[2];
d = fourcc[3];
uint32_t code = ((uint32_t)(a) | ((uint32_t)(b) << 8) | ((uint32_t)(c) << 16) | ((uint32_t)(d) << 24));
Create(width, height, code);
}
DumbFramebuffer::~DumbFramebuffer()
{
Destroy();
}
void DumbFramebuffer::print_short() const
{
printf("DumbFramebuffer %d\n", id());
}
struct FormatPlaneInfo
{
uint8_t bitspp; /* bits per (macro) pixel */
uint8_t xsub;
uint8_t ysub;
};
struct FormatInfo
{
uint32_t format;
uint8_t num_planes;
struct FormatPlaneInfo planes[4];
};
static const FormatInfo format_info_array[] = {
/* YUV packed */
{ DRM_FORMAT_UYVY, 1, { { 32, 2, 1 } }, },
{ DRM_FORMAT_YUYV, 1, { { 32, 2, 1 } }, },
/* YUV semi-planar */
{ DRM_FORMAT_NV12, 2, { { 8, 1, 1, }, { 16, 2, 2 } }, },
/* RGB16 */
{ DRM_FORMAT_RGB565, 1, { { 16, 1, 1 } }, },
/* RGB32 */
{ DRM_FORMAT_XRGB8888, 1, { { 32, 1, 1 } }, },
};
static const FormatInfo& find_format(uint32_t format)
{
for (uint i = 0; i < ARRAY_SIZE(format_info_array); ++i) {
if (format == format_info_array[i].format)
return format_info_array[i];
}
throw std::invalid_argument("foo");
}
void DumbFramebuffer::Create(uint32_t width, uint32_t height, uint32_t format)
{
int r;
m_format = format;
const FormatInfo& format_info = find_format(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 std::invalid_argument("foo");
plane.handle = creq.handle;
plane.stride = creq.pitch;
plane.size = creq.height * creq.pitch;
/*
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 std::invalid_argument("foo");
/* 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 std::invalid_argument("foo");
/* 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] = { 0 };
uint32_t id;
r = drmModeAddFB2(card().fd(), width, height, format,
bo_handles, pitches, offsets, &id, 0);
if (r)
throw std::invalid_argument("foo");
m_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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