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render/egl: improve modifier support detection 

Support for EXT_image_dma_buf_import_modifiers doesn't necessarily
indicate support for modifiers. For instance, Mesa will advertise
EXT_image_dma_buf_import_modifiers for all drivers. This is a trick
to allow EGL clients to enumerate supported formats (something
EXT_image_dma_buf_import is missing). For more information, see [1].

Add a new wlr_egl.has_modifiers flag which indicates whether
modifiers are supported. It's set to true if any
eglQueryDmaBufModifiersEXT query returned a non-empty list.

Use that flag to figure out whether the buffer modifier should be
passed to the EGL implementation on import.

[1]: https://github.com/KhronosGroup/EGL-Registry/issues/142
This commit is contained in:
Simon Ser 2021-11-27 18:33:04 +01:00 committed by Simon Zeni
parent de0bc78319
commit 1bf9676e87
2 changed files with 10 additions and 14 deletions
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1
include/wlr/render/egl.h
View File

@ -65,6 +65,7 @@ struct wlr_egl {
PFNEGLQUERYDEVICESEXTPROC eglQueryDevicesEXT;
} procs;
bool has_modifiers;
struct wlr_drm_format_set dmabuf_texture_formats;
struct wlr_drm_format_set dmabuf_render_formats;
};

23
render/egl.c
View File

@ -160,6 +160,8 @@ static void init_dmabuf_formats(struct wlr_egl *egl) {
has_modifiers ? "supported" : "unsupported");
free(str_formats);
egl->has_modifiers = has_modifiers;
out:
free(formats);
}
@ -644,19 +646,11 @@ EGLImageKHR wlr_egl_create_image_from_dmabuf(struct wlr_egl *egl,
return NULL;
}
bool has_modifier = false;
// we assume the same way we assumed formats without the import_modifiers
// extension that mod_linear is supported. The special mod mod_invalid
// is sometimes used to signal modifier unawareness which is what we
// have here
if (attributes->modifier != DRM_FORMAT_MOD_INVALID &&
attributes->modifier != DRM_FORMAT_MOD_LINEAR) {
if (!egl->exts.EXT_image_dma_buf_import_modifiers) {
wlr_log(WLR_ERROR, "dmabuf modifiers extension not present");
return NULL;
}
has_modifier = true;
attributes->modifier != DRM_FORMAT_MOD_LINEAR &&
!egl->has_modifiers) {
wlr_log(WLR_ERROR, "EGL implementation doesn't support modifiers");
return NULL;
}
unsigned int atti = 0;
@ -702,14 +696,15 @@ EGLImageKHR wlr_egl_create_image_from_dmabuf(struct wlr_egl *egl,
}
};
for (int i=0; i < attributes->n_planes; i++) {
for (int i = 0; i < attributes->n_planes; i++) {
attribs[atti++] = attr_names[i].fd;
attribs[atti++] = attributes->fd[i];
attribs[atti++] = attr_names[i].offset;
attribs[atti++] = attributes->offset[i];
attribs[atti++] = attr_names[i].pitch;
attribs[atti++] = attributes->stride[i];
if (has_modifier) {
if (egl->has_modifiers &&
attributes->modifier != DRM_FORMAT_MOD_INVALID) {
attribs[atti++] = attr_names[i].mod_lo;
attribs[atti++] = attributes->modifier & 0xFFFFFFFF;
attribs[atti++] = attr_names[i].mod_hi;