From 59b9518f072527ac59593e51df7f5d5331a34f0e Mon Sep 17 00:00:00 2001 From: Thomas Hebb Date: Wed, 5 Jan 2022 00:16:59 -0800 Subject: [PATCH] render/gles2: don't constrain shm formats to ones that support reading commit 44e8451cd93e ("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: 44e8451cd93e ("render/gles2: hide shm formats without GL support") --- render/gles2/pixel_format.c | 14 ++++++++++---- render/gles2/renderer.c | 6 ++++++ 2 files changed, 16 insertions(+), 4 deletions(-) diff --git a/render/gles2/pixel_format.c b/render/gles2/pixel_format.c index 31bb3908..b155bbbe 100644 --- a/render/gles2/pixel_format.c +++ b/render/gles2/pixel_format.c @@ -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; } diff --git a/render/gles2/renderer.c b/render/gles2/renderer.c index 527d85bf..67b8ead4 100644 --- a/render/gles2/renderer.c +++ b/render/gles2/renderer.c @@ -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); -- GitLab