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#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <string.h>
#include <inttypes.h>
#include <getopt.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
#include <xf86drm.h>
#include <xf86drmMode.h>
/* ------------------------------------------------------------------ */
/* device */
static int fd;
static drmModeConnector *conn = NULL;
static drmModeEncoder *enc = NULL;
static drmModeCrtc *scrtc = NULL;
/* dumb fb */
static struct drm_mode_create_dumb creq;
static uint32_t fb_id;
static uint8_t *fbmem;
static void drm_init_dev(int devnr, bool need_dumb, bool need_master)
{
drmModeRes *res;
char dev[64];
int i, rc;
uint64_t has_dumb;
/* open device */
snprintf(dev, sizeof(dev), DRM_DEV_NAME, DRM_DIR_NAME, devnr);
fd = open(dev, O_RDWR);
if (fd < 0) {
fprintf(stderr, "open %s: %s\n", dev, strerror(errno));
exit(1);
}
if (need_dumb) {
rc = drmGetCap(fd, DRM_CAP_DUMB_BUFFER, &has_dumb);
if (rc < 0 || !has_dumb) {
fprintf(stderr, "no dumb buffer support\n");
exit(1);
}
}
if (need_master) {
rc = drmSetMaster(fd);
if (rc < 0 || !has_dumb) {
fprintf(stderr, "drmSetMaster() failed, X11 running?\n");
exit(1);
}
}
/* find connector (using first for now) */
res = drmModeGetResources(fd);
if (res == NULL) {
fprintf(stderr, "drmModeGetResources() failed\n");
exit(1);
}
for (i = 0; i < res->count_connectors; i++) {
conn = drmModeGetConnector(fd, res->connectors[i]);
if (conn &&
(conn->connection == DRM_MODE_CONNECTED) &&
conn->count_modes)
break;
drmModeFreeConnector(conn);
conn = NULL;
}
if (!conn) {
fprintf(stderr, "no usable connector found\n");
exit(1);
}
enc = drmModeGetEncoder(fd, conn->encoder_id);
if (enc == NULL) {
fprintf(stderr, "drmModeGetEncoder() failed\n");
exit(1);
}
/* save crtc */
scrtc = drmModeGetCrtc(fd, enc->crtc_id);
}
static void drm_fini_dev(void)
{
/* restore crtc */
if (scrtc) {
drmModeSetCrtc(fd, scrtc->crtc_id, scrtc->buffer_id, scrtc->x, scrtc->y,
&conn->connector_id, 1, &scrtc->mode);
}
}
static void drm_init_dumb_fb(void)
{
struct drm_mode_map_dumb mreq;
int rc;
/* create framebuffer */
memset(&creq, 0, sizeof(creq));
creq.width = conn->modes[0].hdisplay;
creq.height = conn->modes[0].vdisplay;
creq.bpp = 32;
rc = drmIoctl(fd, DRM_IOCTL_MODE_CREATE_DUMB, &creq);
if (rc < 0) {
fprintf(stderr, "DRM_IOCTL_MODE_CREATE_DUMB: %s\n", strerror(errno));
exit(1);
}
rc = drmModeAddFB(fd, creq.width, creq.height, 24, 32, creq.pitch,
creq.handle, &fb_id);
if (rc < 0) {
fprintf(stderr, "drmModeAddFB() failed\n");
exit(1);
}
/* map framebuffer */
memset(&mreq, 0, sizeof(mreq));
mreq.handle = creq.handle;
rc = drmIoctl(fd, DRM_IOCTL_MODE_MAP_DUMB, &mreq);
if (rc < 0) {
fprintf(stderr, "DRM_IOCTL_MODE_MAP_DUMB: %s\n", strerror(errno));
exit(1);
}
fbmem = mmap(0, creq.size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, mreq.offset);
if (fbmem == MAP_FAILED) {
fprintf(stderr, "framebuffer mmap: %s\n", strerror(errno));
exit(1);
}
}
static void drm_draw_dumb_fb(void)
{
int x, y;
uint8_t *ptr;
for (y = 0; y < creq.height; y++) {
for (x = 0; x < creq.width; x++) {
ptr = fbmem + creq.pitch * y + 4 * x;
ptr[0] = 0; /* blue */
ptr[1] = x & 0xff; /* green */
ptr[2] = y & 0xff; /* red */
ptr[3] = 0; /* alpha */
}
}
drmModeDirtyFB(fd, fb_id, 0, 0);
}
static void drm_show_dumb_fb(void)
{
int rc;
rc = drmModeSetCrtc(fd, enc->crtc_id, fb_id, 0, 0,
&conn->connector_id, 1,
&conn->modes[0]);
if (rc < 0) {
fprintf(stderr, "drmModeSetCrtc() failed\n");
exit (1);
}
}
/* ------------------------------------------------------------------ */
static void usage(FILE *fp)
{
fprintf(fp,
"\n"
"usage: drmtest [ options ]\n"
"\n"
"options:\n"
" -h print this\n"
" -c <nr> pick card\n"
"\n");
}
int main(int argc, char **argv)
{
int card = 0;
int c;
for (;;) {
c = getopt(argc, argv, "hc:");
if (c == -1)
break;
switch (c) {
case 'c':
card = atoi(optarg);
break;
case 'h':
usage(stdout);
exit(0);
default:
usage(stderr);
exit(1);
}
}
drm_init_dev(card, true, true);
drm_init_dumb_fb();
drm_draw_dumb_fb();
drm_show_dumb_fb();
sleep(3);
drm_fini_dev();
return 0;
}
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