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example: refactor dumb FB helper

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This is necessary for the upcoming composer example.
This commit is contained in:
Simon Ser 2019-09-25 15:06:46 +03:00
parent a7128585fe
commit a30668b06e
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GPG key ID: 0FDE7BE0E88F5E48
3 changed files with 55 additions and 24 deletions
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51
example/common.c
View file

@ -1,3 +1,4 @@
#include <assert.h>
#include <drm_fourcc.h>
#include <stddef.h>
#include <sys/mman.h>
@ -47,13 +48,13 @@ void disable_all_crtcs_except(int drm_fd, drmModeRes *drm_res, uint32_t crtc_id)
}
}
uint32_t create_argb_fb(int drm_fd, uint32_t width, uint32_t height,
uint32_t color, bool with_alpha)
bool dumb_fb_init(struct dumb_fb *fb, int drm_fd, uint32_t format,
uint32_t width, uint32_t height)
{
int ret;
uint32_t fb_id;
uint32_t *data;
size_t i;
assert(format == DRM_FORMAT_ARGB8888 || format == DRM_FORMAT_XRGB8888);
struct drm_mode_create_dumb create = {
.width = width,
@ -63,36 +64,54 @@ uint32_t create_argb_fb(int drm_fd, uint32_t width, uint32_t height,
};
ret = drmIoctl(drm_fd, DRM_IOCTL_MODE_CREATE_DUMB, &create);
if (ret < 0) {
return 0;
return false;
}
uint32_t fmt = with_alpha ? DRM_FORMAT_ARGB8888 : DRM_FORMAT_XRGB8888;
uint32_t handles[4] = { create.handle };
uint32_t strides[4] = { create.pitch };
uint32_t offsets[4] = { 0 };
ret = drmModeAddFB2(drm_fd, width, height, fmt, handles, strides,
ret = drmModeAddFB2(drm_fd, width, height, format, handles, strides,
offsets, &fb_id, 0);
if (ret < 0) {
return 0;
return false;
}
struct drm_mode_map_dumb map = { .handle = create.handle };
fb->width = width;
fb->height = height;
fb->stride = create.pitch;
fb->size = create.size;
fb->handle = create.handle;
fb->id = fb_id;
return true;
}
void *dumb_fb_map(struct dumb_fb *fb, int drm_fd)
{
int ret;
struct drm_mode_map_dumb map = { .handle = fb->handle };
ret = drmIoctl(drm_fd, DRM_IOCTL_MODE_MAP_DUMB, &map);
if (ret < 0) {
return 0;
return MAP_FAILED;
}
data = mmap(0, create.size, PROT_READ | PROT_WRITE, MAP_SHARED, drm_fd,
return mmap(0, fb->size, PROT_READ | PROT_WRITE, MAP_SHARED, drm_fd,
map.offset);
}
void dumb_fb_fill(struct dumb_fb *fb, int drm_fd, uint32_t color)
{
uint32_t *data;
size_t i;
data = dumb_fb_map(fb, drm_fd);
if (data == MAP_FAILED) {
return 0;
return;
}
for (i = 0; i < create.size / sizeof(uint32_t); i++) {
for (i = 0; i < fb->size / sizeof(uint32_t); i++) {
data[i] = color;
}
munmap(data, create.size);
return fb_id;
munmap(data, fb->size);
}

14
example/common.h
View file

@ -5,11 +5,21 @@
#include <stdint.h>
#include <xf86drmMode.h>
struct dumb_fb {
uint32_t format;
uint32_t width, height, stride, size;
uint32_t handle;
uint32_t id;
};
drmModeConnector *pick_connector(int drm_fd, drmModeRes *drm_res);
drmModeCrtc *pick_crtc(int drm_fd, drmModeRes *drm_res,
drmModeConnector *connector);
void disable_all_crtcs_except(int drm_fd, drmModeRes *drm_res, uint32_t crtc_id);
uint32_t create_argb_fb(int drm_fd, uint32_t width, uint32_t height,
uint32_t color, bool with_alpha);
bool dumb_fb_init(struct dumb_fb *fb, int drm_fd, uint32_t format,
uint32_t width, uint32_t height);
void *dumb_fb_map(struct dumb_fb *fb, int drm_fd);
void dumb_fb_fill(struct dumb_fb *fb, int drm_fd, uint32_t color);
#endif

14
example/simple.c
View file

@ -1,4 +1,5 @@
#define _POSIX_C_SOURCE 200809L
#include <drm_fourcc.h>
#include <fcntl.h>
#include <libliftoff.h>
#include <stdio.h>
@ -21,20 +22,21 @@ static struct liftoff_layer *add_layer(int drm_fd, struct liftoff_output *output
bool with_alpha)
{
static size_t color_idx = 0;
uint32_t fb_id;
struct dumb_fb fb = {0};
struct liftoff_layer *layer;
fb_id = create_argb_fb(drm_fd, width, height, colors[color_idx],
with_alpha);
if (fb_id == 0) {
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);
printf("Created FB %d with size %dx%d\n", fb.id, width, height);
dumb_fb_fill(&fb, drm_fd, colors[color_idx]);
color_idx = (color_idx + 1) % (sizeof(colors) / sizeof(colors[0]));
layer = liftoff_layer_create(output);
liftoff_layer_set_property(layer, "FB_ID", fb_id);
liftoff_layer_set_property(layer, "FB_ID", fb.id);
liftoff_layer_set_property(layer, "CRTC_X", x);
liftoff_layer_set_property(layer, "CRTC_Y", y);
liftoff_layer_set_property(layer, "CRTC_W", width);