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render: allocator: gbm: Implement allocation of NV12 buffers

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This needs to be handled specifically for NV12 because GBM does not know
how to allocate NV12 buffers. The approach I've taken is to allocate a
linear R8 buffer for storage and then to import it as NV12 with an
offset for the chroma plane.

Signed-off-by: Andri Yngvason <andri@yngvason.is>
This commit is contained in:
Andri Yngvason 2026-04-15 12:27:22 +00:00
parent e6eb3e1ae4
commit 6e6d0f4731
1 changed files with 45 additions and 2 deletions
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47
render/allocator/gbm.c
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@ -59,6 +59,41 @@ error_fd:
return false;
}
static struct gbm_bo *create_nv12_bo(struct gbm_device *gbm, int width, int height) {
int usage = GBM_BO_USE_RENDERING | GBM_BO_USE_SCANOUT | GBM_BO_USE_LINEAR;
struct gbm_bo *base = gbm_bo_create(gbm, width, height + (height + 1) / 2,
DRM_FORMAT_R8, usage);
if (!base) {
return NULL;
}
int fd = gbm_bo_get_fd(base);
if (fd < 0) {
gbm_bo_destroy(base);
return NULL;
}
struct gbm_import_fd_modifier_data d = {
.format = DRM_FORMAT_NV12,
.width = width,
.height = height,
.modifier = gbm_bo_get_modifier(base),
.num_fds = 2,
.fds[0] = fd,
.offsets[0] = 0,
.strides[0] = gbm_bo_get_stride(base),
.fds[1] = fd,
.offsets[1] = height * gbm_bo_get_stride(base),
.strides[1] = gbm_bo_get_stride(base),
};
struct gbm_bo *bo = gbm_bo_import(gbm, GBM_BO_IMPORT_FD_MODIFIER, &d, 0);
close(fd);
gbm_bo_destroy(base);
return bo;
}
static struct wlr_gbm_buffer *create_buffer(struct wlr_gbm_allocator *alloc,
int width, int height, const struct wlr_drm_format *format) {
struct gbm_device *gbm_device = alloc->gbm_device;
@ -68,8 +103,16 @@ static struct wlr_gbm_buffer *create_buffer(struct wlr_gbm_allocator *alloc,
bool has_modifier = true;
uint64_t fallback_modifier = DRM_FORMAT_MOD_INVALID;
errno = 0;
struct gbm_bo *bo = gbm_bo_create_with_modifiers(gbm_device, width, height,
format->format, format->modifiers, format->len);
struct gbm_bo *bo;
if (format->format == DRM_FORMAT_NV12) {
bo = create_nv12_bo(gbm_device, width, height);
if (bo == NULL) {
return NULL;
}
} else {
bo = gbm_bo_create_with_modifiers(gbm_device, width, height,
format->format, format->modifiers, format->len);
}
if (bo == NULL) {
uint32_t usage = GBM_BO_USE_SCANOUT | GBM_BO_USE_RENDERING;
if (format->len == 1 &&