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render/gles2: don't constrain shm formats to ones that support reading

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commit 44e8451cd9 ("render/gles2: hide shm formats without GL
support") added the is_gles2_pixel_format_supported() function to
render/gles2/pixel_format.c, whose stated purpose is to "check whether
the renderer has the needed GL extensions to read a given pixel format."
It then used that function to filter the pixel formats returned by
get_gles2_shm_formats().

The result of this change is that RGB formats are no longer reported for
GL drivers that don't implement EXT_read_format_bgra, even when those
formats are supported for rendering (which they have to be for
wlr_gles2_renderer_create() to succeed). This is a pretty clear
regression, since wlr_renderer_init_wl_shm() fails when either of
WL_SHM_FORMAT_ARGB8888 or WL_SHM_FORMAT_XRGB8888 are missing.

To fix the regression, change is_gles2_pixel_format_supported() to
accept all pixel formats that support rendering, regardless of whether
we can read them or not, and move the check for EXT_read_format_bgra
back into gles2_read_pixels(). (There's already a check for this
extension in gles2_preferred_read_format(), so we're not breaking any
abstraction that wasn't already broken.)

Tested on the NVIDIA 495.46 proprietary driver, which doesn't support
EXT_read_format_bgra.

Fixes: 44e8451cd9 ("render/gles2: hide shm formats without GL support")
This commit is contained in:
Thomas Hebb 2022-01-05 00:16:59 -08:00
parent 9988eb3378
commit 59b9518f07
2 changed files with 16 additions and 4 deletions
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14
render/gles2/pixel_format.c
View file

@ -98,6 +98,10 @@ static const struct wlr_gles2_pixel_format formats[] = {
// TODO: more pixel formats
/*
* Return true if supported for texturing, even if other operations like
* reading aren't supported.
*/
bool is_gles2_pixel_format_supported(const struct wlr_gles2_renderer *renderer,
const struct wlr_gles2_pixel_format *format) {
if (format->gl_type == GL_UNSIGNED_INT_2_10_10_10_REV_EXT
@ -108,10 +112,12 @@ bool is_gles2_pixel_format_supported(const struct wlr_gles2_renderer *renderer,
&& !renderer->exts.OES_texture_half_float_linear) {
return false;
}
if (format->gl_format == GL_BGRA_EXT
&& !renderer->exts.EXT_read_format_bgra) {
return false;
}
/*
* Note that we don't need to check for GL_EXT_texture_format_BGRA8888
* here, since we've already checked if we have it at renderer creation
* time and bailed out if not. We do the check there because Wayland
* requires all compositors to support SHM buffers in that format.
*/
return true;
}

6
render/gles2/renderer.c
View file

@ -441,6 +441,12 @@ static bool gles2_read_pixels(struct wlr_renderer *wlr_renderer,
return false;
}
if (fmt->gl_format == GL_BGRA_EXT && !renderer->exts.EXT_read_format_bgra) {
wlr_log(WLR_ERROR,
"Cannot read pixels: missing GL_EXT_read_format_bgra extension");
return false;
}
const struct wlr_pixel_format_info *drm_fmt =
drm_get_pixel_format_info(fmt->drm_format);
assert(drm_fmt);