Hi Marc-Andre,
> Subject: Re: [PATCH v3 5/6] ui/spice: Create a new texture with linear layout
> when gl=on is enabled
>
> Hi
>
> On Tue, Apr 29, 2025 at 10:13 AM Vivek Kasireddy
> <vivek.kasire...@intel.com> wrote:
> >
> > Since most encoders/decoders (invoked by Spice) may not work with
> > tiled memory associated with a texture, we need to create another
> > texture that has linear memory layout and use that instead.
> >
> > Note that, there does not seem to be a direct way to indicate to the
> > GL implementation that a texture's backing memory needs to be linear.
> > Instead, we have to do it in a roundabout way where we need to first
> > create a tiled texture and import that as a memory object to create
> > a new texture that has a linear memory layout.
> >
> > Cc: Gerd Hoffmann <kra...@redhat.com>
> > Cc: Marc-André Lureau <marcandre.lur...@redhat.com>
> > Cc: Dmitry Osipenko <dmitry.osipe...@collabora.com>
> > Cc: Frediano Ziglio <fredd...@gmail.com>
> > Cc: Dongwon Kim <dongwon....@intel.com>
> > Signed-off-by: Vivek Kasireddy <vivek.kasire...@intel.com>
> > ---
> > ui/spice-display.c | 63
> +++++++++++++++++++++++++++++++++++++++++++++-
> > 1 file changed, 62 insertions(+), 1 deletion(-)
> >
> > diff --git a/ui/spice-display.c b/ui/spice-display.c
> > index 2c4daa0707..047d453a0b 100644
> > --- a/ui/spice-display.c
> > +++ b/ui/spice-display.c
> > @@ -26,6 +26,7 @@
> > #include "ui/console.h"
> > #include "trace.h"
> >
> > +#include "standard-headers/drm/drm_fourcc.h"
> > #include "ui/spice-display.h"
> >
> > bool spice_opengl;
> > @@ -890,11 +891,65 @@ static void
> spice_gl_update(DisplayChangeListener *dcl,
> > ssd->gl_updates++;
> > }
> >
> > +static bool spice_gl_replace_fd_texture(SimpleSpiceDisplay *ssd,
> > + EGLint *stride, EGLint *fourcc,
> > + EGLuint64KHR *modifier,
> > + int *fd)
> > +{
> > + GLuint texture = 0;
> > +
> > + if (!remote_client) {
> > + return true;
> > + }
> > +
> > + if (surface_format(ssd->ds) == PIXMAN_r5g6b5) {
> > + return true;
> > + }
>
> Please explain why this particular format is handled differently with a
> comment.
I guess I'll remove this check as I don't remember why I added it in the
first place.
>
> > +
> > + if (*modifier == DRM_FORMAT_MOD_LINEAR) {
> > + return true;
> > + }
> > +
> > + /*
> > + * We really want to ensure that the memory layout of the texture
> > + * is linear; otherwise, the encoder's output may show corruption.
> > + */
> > + surface_gl_create_texture_from_fd(ssd->ds, *fd, &texture);
> > +
> > + /*
> > + * A successful return after glImportMemoryFdEXT() means that
> > + * the ownership of fd has been passed to GL. In other words,
> > + * the fd we got above should not be used anymore.
> > + */
> > + if (texture > 0) {
> > + *fd = egl_get_fd_for_texture(texture,
> > + stride, fourcc,
> > + NULL);
> > + if (*fd < 0) {
> > + glDeleteTextures(1, &texture);
> > + *fd = egl_get_fd_for_texture(ssd->ds->texture,
> > + stride, fourcc,
> > + NULL);
> > + if (*fd < 0) {
> > + surface_gl_destroy_texture(ssd->gls, ssd->ds);
> > + warn_report("spice: no texture available to display");
> > + return false;
> > + }
> > + } else {
> > + surface_gl_destroy_texture(ssd->gls, ssd->ds);
> > + ssd->ds->texture = texture;
> > + }
> > + }
>
> If it failed, it does nothing and continues?
An error gets printed when a failure is encountered in different places
but printing one here would also be ok.
Thanks,
Vivek
>
>
> > + return true;
> > +}
> > +
> > static void spice_gl_switch(DisplayChangeListener *dcl,
> > struct DisplaySurface *new_surface)
> > {
> > SimpleSpiceDisplay *ssd = container_of(dcl, SimpleSpiceDisplay, dcl);
> > EGLint stride, fourcc;
> > + EGLuint64KHR modifier;
> > + bool ret;
> > int fd;
> >
> > if (ssd->ds) {
> > @@ -905,12 +960,18 @@ static void spice_gl_switch(DisplayChangeListener
> *dcl,
> > surface_gl_create_texture(ssd->gls, ssd->ds);
> > fd = egl_get_fd_for_texture(ssd->ds->texture,
> > &stride, &fourcc,
> > - NULL);
> > + &modifier);
> > if (fd < 0) {
> > surface_gl_destroy_texture(ssd->gls, ssd->ds);
> > return;
> > }
> >
> > + ret = spice_gl_replace_fd_texture(ssd, &stride, &fourcc, &modifier,
> &fd);
> > + if (!ret) {
> > + surface_gl_destroy_texture(ssd->gls, ssd->ds);
> > + return;
> > + }
> > +
> > trace_qemu_spice_gl_surface(ssd->qxl.id,
> > surface_width(ssd->ds),
> > surface_height(ssd->ds),
> > --
> > 2.49.0
> >
> >
>
>
> --
> Marc-André Lureau
