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render/egl: improve modifier support detection

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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; PFNEGLQUERYDEVICESEXTPROC eglQueryDevicesEXT;
} procs; } procs;
bool has_modifiers;
struct wlr_drm_format_set dmabuf_texture_formats; struct wlr_drm_format_set dmabuf_texture_formats;
struct wlr_drm_format_set dmabuf_render_formats; struct wlr_drm_format_set dmabuf_render_formats;
}; };

19
render/egl.c
View file

@ -160,6 +160,8 @@ static void init_dmabuf_formats(struct wlr_egl *egl) {
has_modifiers ? "supported" : "unsupported"); has_modifiers ? "supported" : "unsupported");
free(str_formats); free(str_formats);
egl->has_modifiers = has_modifiers;
out: out:
free(formats); free(formats);
} }
@ -644,20 +646,12 @@ EGLImageKHR wlr_egl_create_image_from_dmabuf(struct wlr_egl *egl,
return NULL; 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 && if (attributes->modifier != DRM_FORMAT_MOD_INVALID &&
attributes->modifier != DRM_FORMAT_MOD_LINEAR) { attributes->modifier != DRM_FORMAT_MOD_LINEAR &&
if (!egl->exts.EXT_image_dma_buf_import_modifiers) { !egl->has_modifiers) {
wlr_log(WLR_ERROR, "dmabuf modifiers extension not present"); wlr_log(WLR_ERROR, "EGL implementation doesn't support modifiers");
return NULL; return NULL;
} }
has_modifier = true;
}
unsigned int atti = 0; unsigned int atti = 0;
EGLint attribs[50]; EGLint attribs[50];
@ -709,7 +703,8 @@ EGLImageKHR wlr_egl_create_image_from_dmabuf(struct wlr_egl *egl,
attribs[atti++] = attributes->offset[i]; attribs[atti++] = attributes->offset[i];
attribs[atti++] = attr_names[i].pitch; attribs[atti++] = attr_names[i].pitch;
attribs[atti++] = attributes->stride[i]; 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++] = attr_names[i].mod_lo;
attribs[atti++] = attributes->modifier & 0xFFFFFFFF; attribs[atti++] = attributes->modifier & 0xFFFFFFFF;
attribs[atti++] = attr_names[i].mod_hi; attribs[atti++] = attr_names[i].mod_hi;