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

[Marek Olšák]

I use a simple texturing fragment shader and the equation "src*a +
dst*(1-a)" for blending.

Sorry A8 is probably wrong too, because the text would be black (it's
(0,0,0,A), not (1,1,1,A)). I'll write a patch to use swizzling in the
fragment shader instead.

Marek


On Tue, Apr 2, 2013 at 2:33 AM, Brian Paul <brianp at vmware.com> wrote:

> On 04/01/2013 06:18 PM, Marek Olšák wrote:
>
>> Have you checked the font is rendered correctly?
>>
>
> Yeah, it works fine.
>
>
>
>  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.
>>
>
> Hmmm, I just tried A8 and it text is missing.
>
> I figured you were using a KIL-based fragment shader for the text as in
> the state tracker's glBitmap code.
>
> I'll look closer later...
>
> -Brian
>
>
>
>>
>> On Tue, Apr 2, 2013 at 12:46 AM, Brian Paul <brian.e.paul at gmail.com
>> <mailto:brian.e.paul at gmail.com**>> wrote:
>>
>>     From: Brian Paul <brianp at vmware.com <mailto: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
>>
>>     ______________________________**_________________
>>     mesa-dev mailing list
>>     mesa-dev at lists.freedesktop.org <mailto:mesa-dev at lists.**
>> freedesktop.org <mesa-dev at lists.freedesktop.org>>
>>     http://lists.freedesktop.org/**mailman/listinfo/mesa-dev<http://lists.freedesktop.org/mailman/listinfo/mesa-dev>
>>
>>
>>
>>
>>
>> ______________________________**_________________
>> mesa-dev mailing list
>> mesa-dev at lists.freedesktop.org
>> http://lists.freedesktop.org/**mailman/listinfo/mesa-dev<http://lists.freedesktop.org/mailman/listinfo/mesa-dev>
>>
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.freedesktop.org/archives/mesa-dev/attachments/20130402/7afd3bac/attachment-0001.html>