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example/simple: disable CRTCs we don't use

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This commit is contained in:
Simon Ser 2019-09-25 12:26:06 +03:00
parent 35da32683f
commit 42b58e8802
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GPG key ID: 0FDE7BE0E88F5E48
1 changed files with 15 additions and 0 deletions
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15
example/simple.c
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@ -40,6 +40,20 @@ static drmModeCrtc *pick_crtc(int drm_fd, drmModeRes *drm_res,
return drmModeGetCrtc(drm_fd, crtc_id);
}
static void disable_all_crtcs_except(int drm_fd, drmModeRes *drm_res,
uint32_t crtc_id)
{
int i;
for (i = 0; i < drm_res->count_crtcs; i++) {
if (drm_res->crtcs[i] == crtc_id) {
continue;
}
drmModeSetCrtc(drm_fd, drm_res->crtcs[i],
0, 0, 0, NULL, 0, NULL);
}
}
static uint32_t create_argb_fb(int drm_fd, uint32_t width, uint32_t height,
uint32_t color, bool with_alpha)
{
@ -165,6 +179,7 @@ int main(int argc, char *argv[])
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(display, crtc->crtc_id);
drmModeFreeResources(drm_res);