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/* Minimalistic example: create a few layers and display as many of them as
* possible. Layers that don't make it into a plane won't be displayed. */
#define _POSIX_C_SOURCE 200809L
#include <drm_fourcc.h>
#include <fcntl.h>
#include <libliftoff.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <xf86drm.h>
#include <xf86drmMode.h>
#include "common.h"
#define LAYERS_LEN 4
/* ARGB 8:8:8:8 */
static const uint32_t colors[] = {
0xFFFF0000, /* red */
0xFF00FF00, /* green */
0xFF0000FF, /* blue */
0xFFFFFF00, /* yellow */
};
static struct liftoff_layer *
add_layer(int drm_fd, struct liftoff_output *output, int x, int y, uint32_t width,
uint32_t height, bool with_alpha)
{
static bool first = true;
static size_t color_idx = 0;
struct dumb_fb fb = {0};
uint32_t color;
struct liftoff_layer *layer;
uint32_t format = with_alpha ? DRM_FORMAT_ARGB8888 : DRM_FORMAT_XRGB8888;
if (!dumb_fb_init(&fb, drm_fd, format, width, height)) {
fprintf(stderr, "failed to create framebuffer\n");
return NULL;
}
printf("Created FB %d with size %dx%d\n", fb.id, width, height);
if (first) {
color = 0xFFFFFFFF;
first = false;
} else {
color = colors[color_idx];
color_idx = (color_idx + 1) % (sizeof(colors) / sizeof(colors[0]));
}
dumb_fb_fill(&fb, drm_fd, color);
layer = liftoff_layer_create(output);
liftoff_layer_set_property(layer, "FB_ID", fb.id);
liftoff_layer_set_property(layer, "CRTC_X", (uint64_t)x);
liftoff_layer_set_property(layer, "CRTC_Y", (uint64_t)y);
liftoff_layer_set_property(layer, "CRTC_W", width);
liftoff_layer_set_property(layer, "CRTC_H", height);
liftoff_layer_set_property(layer, "SRC_X", 0);
liftoff_layer_set_property(layer, "SRC_Y", 0);
liftoff_layer_set_property(layer, "SRC_W", width << 16);
liftoff_layer_set_property(layer, "SRC_H", height << 16);
return layer;
}
int
main(int argc, char *argv[])
{
int drm_fd;
struct liftoff_device *device;
drmModeRes *drm_res;
drmModeCrtc *crtc;
drmModeConnector *connector;
struct liftoff_output *output;
struct liftoff_layer *layers[LAYERS_LEN];
struct liftoff_plane *plane;
drmModeAtomicReq *req;
int ret;
size_t i;
uint32_t flags;
drm_fd = open("/dev/dri/card0", O_RDWR | O_CLOEXEC);
if (drm_fd < 0) {
perror("open");
return 1;
}
if (drmSetClientCap(drm_fd, DRM_CLIENT_CAP_ATOMIC, 1) < 0) {
perror("drmSetClientCap(ATOMIC)");
return 1;
}
device = liftoff_device_create(drm_fd);
if (device == NULL) {
perror("liftoff_device_create");
return 1;
}
liftoff_device_register_all_planes(device);
drm_res = drmModeGetResources(drm_fd);
connector = pick_connector(drm_fd, drm_res);
crtc = pick_crtc(drm_fd, drm_res, connector);
disable_all_crtcs_except(drm_fd, drm_res, crtc->crtc_id);
output = liftoff_output_create(device, crtc->crtc_id);
drmModeFreeResources(drm_res);
if (connector == NULL) {
fprintf(stderr, "no connector found\n");
return 1;
}
if (crtc == NULL || !crtc->mode_valid) {
fprintf(stderr, "no CRTC found\n");
return 1;
}
printf("Using connector %d, CRTC %d\n", connector->connector_id,
crtc->crtc_id);
layers[0] = add_layer(drm_fd, output, 0, 0, crtc->mode.hdisplay,
crtc->mode.vdisplay, false);
for (i = 1; i < LAYERS_LEN; i++) {
layers[i] = add_layer(drm_fd, output, 100 * (int)i, 100 * (int)i,
256, 256, i % 2);
}
for (i = 0; i < LAYERS_LEN; i++) {
liftoff_layer_set_property(layers[i], "zpos", i);
}
flags = DRM_MODE_ATOMIC_NONBLOCK;
req = drmModeAtomicAlloc();
ret = liftoff_output_apply(output, req, flags, NULL);
if (ret != 0) {
perror("liftoff_output_apply");
return 1;
}
ret = drmModeAtomicCommit(drm_fd, req, flags, NULL);
if (ret < 0) {
perror("drmModeAtomicCommit");
return 1;
}
for (i = 0; i < sizeof(layers) / sizeof(layers[0]); i++) {
plane = liftoff_layer_get_plane(layers[i]);
if (plane != NULL) {
printf("Layer %zu got assigned to plane %u\n", i,
liftoff_plane_get_id(plane));
} else {
printf("Layer %zu has no plane assigned\n", i);
}
}
sleep(1);
drmModeAtomicFree(req);
for (i = 0; i < sizeof(layers) / sizeof(layers[0]); i++) {
liftoff_layer_destroy(layers[i]);
}
liftoff_output_destroy(output);
drmModeFreeCrtc(crtc);
drmModeFreeConnector(connector);
liftoff_device_destroy(device);
return 0;
}
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