[Mesa-dev] [PATCH 2/3] hud: try L8 texture for font if I8 format isn't supported

[Marek Olšák]

Have you checked the font is rendered correctly? The font should be
transparent and the blend function reads the alpha channel to determine the
transparency, so A8 would be a better option. If that isn't an option
either, the fragment shader should do .xxxx swizzling.

Marek


On Tue, Apr 2, 2013 at 12:46 AM, Brian Paul <brian.e.paul at gmail.com> wrote:

> From: Brian Paul <brianp at vmware.com>
>
> ---
>  src/gallium/auxiliary/hud/font.c |   17 +++++++++++++----
>  1 file changed, 13 insertions(+), 4 deletions(-)
>
> diff --git a/src/gallium/auxiliary/hud/font.c
> b/src/gallium/auxiliary/hud/font.c
> index 5c4a4d0..6747874 100644
> --- a/src/gallium/auxiliary/hud/font.c
> +++ b/src/gallium/auxiliary/hud/font.c
> @@ -377,17 +377,26 @@ util_font_create_fixed_8x13(struct pipe_context
> *pipe,
>     struct pipe_resource tex_templ, *tex;
>     struct pipe_transfer *transfer = NULL;
>     char *map;
> +   enum pipe_format tex_format;
>     int i;
>
> -   if (!screen->is_format_supported(screen, PIPE_FORMAT_I8_UNORM,
> -                                    PIPE_TEXTURE_RECT, 0,
> -                                    PIPE_BIND_SAMPLER_VIEW)) {
> +   if (screen->is_format_supported(screen, PIPE_FORMAT_I8_UNORM,
> +                                   PIPE_TEXTURE_RECT, 0,
> +                                   PIPE_BIND_SAMPLER_VIEW)) {
> +      tex_format = PIPE_FORMAT_I8_UNORM;
> +   }
> +   else if (screen->is_format_supported(screen, PIPE_FORMAT_L8_UNORM,
> +                                   PIPE_TEXTURE_RECT, 0,
> +                                   PIPE_BIND_SAMPLER_VIEW)) {
> +      tex_format = PIPE_FORMAT_L8_UNORM;
> +   }
> +   else {
>        return FALSE;
>     }
>
>     memset(&tex_templ, 0, sizeof(tex_templ));
>     tex_templ.target = PIPE_TEXTURE_RECT;
> -   tex_templ.format = PIPE_FORMAT_I8_UNORM;
> +   tex_templ.format = tex_format;
>     tex_templ.width0 = 128;
>     tex_templ.height0 = 256;
>     tex_templ.depth0 = 1;
> --
> 1.7.9.5
>
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