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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>
#include "gfx.h"
#include "drmtools.h"
/* ------------------------------------------------------------------ */
/* device */
static int fd;
static drmModeConnector *conn = NULL;
static drmModeEncoder *enc = NULL;
static drmModeModeInfo *mode = NULL;
static drmModeCrtc *scrtc = NULL;
static uint32_t fb_id;
/* dumb fb */
static struct drm_mode_create_dumb creq;
static uint8_t *fbmem;
/* ------------------------------------------------------------------ */
static void drm_cleanup_display(void)
{
/* restore crtc */
if (scrtc) {
drmModeSetCrtc(fd, scrtc->crtc_id, scrtc->buffer_id, scrtc->x, scrtc->y,
&conn->connector_id, 1, &scrtc->mode);
}
}
static int drm_init_dev(const char *dev)
{
drmModeRes *res;
int i, rc;
uint64_t has_dumb;
/* open device */
fd = open(dev, O_RDWR);
if (fd < 0) {
fprintf(stderr, "drm: open %s: %s\n", dev, strerror(errno));
return -1;
}
rc = drmGetCap(fd, DRM_CAP_DUMB_BUFFER, &has_dumb);
if (rc < 0 || !has_dumb) {
fprintf(stderr, "drm: no dumb buffer support\n");
return -1;
}
/* find connector (using first for now) */
res = drmModeGetResources(fd);
if (res == NULL) {
fprintf(stderr, "drm: drmModeGetResources() failed\n");
return -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, "drm: no usable connector found\n");
return -1;
}
mode = &conn->modes[0];
enc = drmModeGetEncoder(fd, conn->encoder_id);
if (enc == NULL) {
fprintf(stderr, "drm: drmModeGetEncoder() failed\n");
return -1;
}
/* save crtc */
scrtc = drmModeGetCrtc(fd, enc->crtc_id);
return 0;
}
static int drm_init_fb(void)
{
struct drm_mode_map_dumb mreq;
int rc;
/* create framebuffer */
memset(&creq, 0, sizeof(creq));
creq.width = mode->hdisplay;
creq.height = mode->vdisplay;
creq.bpp = 32;
rc = drmIoctl(fd, DRM_IOCTL_MODE_CREATE_DUMB, &creq);
if (rc < 0) {
fprintf(stderr, "drm: DRM_IOCTL_MODE_CREATE_DUMB: %s\n", strerror(errno));
return -1;
}
rc = drmModeAddFB(fd, creq.width, creq.height, 24, 32, creq.pitch,
creq.handle, &fb_id);
if (rc < 0) {
fprintf(stderr, "drm: drmModeAddFB() failed\n");
return -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: DRM_IOCTL_MODE_MAP_DUMB: %s\n", strerror(errno));
return -1;
}
fbmem = mmap(0, creq.size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, mreq.offset);
if (fbmem == MAP_FAILED) {
fprintf(stderr, "drm: framebuffer mmap: %s\n", strerror(errno));
return -1;
}
return 0;
}
static int drm_show_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, "drm: drmModeSetCrtc() failed\n");
return -1;
}
return 0;
}
/* ------------------------------------------------------------------ */
static void drm_restore_display(void)
{
drm_show_fb();
}
gfxstate *drm_init(const char *dev)
{
gfxstate *gfx;
if (drm_init_dev(dev) < 0)
return NULL;
if (drm_init_fb() < 0)
return NULL;
if (drm_show_fb() < 0)
return NULL;
/* prepare gfx */
gfx = malloc(sizeof(*gfx));
memset(gfx, 0, sizeof(*gfx));
gfx->hdisplay = mode->hdisplay;
gfx->vdisplay = mode->vdisplay;
gfx->stride = creq.pitch;
gfx->mem = fbmem;
gfx->rlen = 8;
gfx->glen = 8;
gfx->blen = 8;
gfx->tlen = 8;
gfx->roff = 16;
gfx->goff = 8;
gfx->boff = 0;
gfx->toff = 24;
gfx->bits_per_pixel = 32;
gfx->restore_display = drm_restore_display;
gfx->cleanup_display = drm_cleanup_display;
return gfx;
}
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