Re: [PATCH 3/5] wined3d: Fixup alpha component in surface_convert_format().

[Paul Gofman]

On 11/11/19 19:07, Henri Verbeet wrote:
> On Fri, 8 Nov 2019 at 15:28, Paul Gofman  wrote:
> > @@ -685,14 +762,22 @@ static struct wined3d_texture *surface_convert_format(struct wined3d_texture *sr
> >      else
> >      {
> >          struct wined3d_box src_box = {0, 0, desc.width, desc.height, 0, 1};
> > -
> >    struct wined3d_bo_address conv_data;
> >
> >    TRACE("Using upload conversion.\n");
> >
> >    wined3d_texture_prepare_location(dst_texture, 0, context, WINED3D_LOCATION_TEXTURE_RGB);
> > -
> >    dst_texture->texture_ops->texture_upload_data(context, wined3d_const_bo_address(&src_data),
> > -
> > -
> >    wined3d_fixup_alpha(context, src_format, dst_format, &src_data, src_row_pitch,
> > -
> >            desc.width, desc.height, &conv_data);
> > -
>
> Although X-channel data is undefined, it seems undesirable to modify
> the source data. Wouldn't it be better to fixup the destination data
> instead?

But I thought I don't modify source data: wined3d_fixup_alpha()
allocates temporary buffer and maps source data as read only. Or am I
missing your point?