[PATCH 4/4] etnaviv: hook up linear texture sampling support

[Lucas Stach]

Hi Christian,

Am Montag, den 21.01.2019, 07:50 +0100 schrieb Christian Gmeiner:
> If the GPU supports linear sampling, linear addressing mode
> will be used as default.
> 
> > Signed-off-by: Christian Gmeiner <christian.gmeiner at gmail.com>
> ---
>  src/gallium/drivers/etnaviv/etnaviv_resource.c | 10 +++++++---
>  src/gallium/drivers/etnaviv/etnaviv_texture.c  |  4 +++-
>  2 files changed, 10 insertions(+), 4 deletions(-)
> 
> diff --git a/src/gallium/drivers/etnaviv/etnaviv_resource.c b/src/gallium/drivers/etnaviv/etnaviv_resource.c
> index 9a7ebf3064e..7d24b1f03bd 100644
> --- a/src/gallium/drivers/etnaviv/etnaviv_resource.c
> +++ b/src/gallium/drivers/etnaviv/etnaviv_resource.c
> @@ -318,9 +318,9 @@ etna_resource_create(struct pipe_screen *pscreen,
>  {
>     struct etna_screen *screen = etna_screen(pscreen);
>  
> -   /* Figure out what tiling and address mode to use -- for now, assume that
> -    * texture cannot be linear. there is a capability LINEAR_TEXTURE_SUPPORT
> -    * (supported on gc880 and gc2000 at least), but not sure how it works.
> +   /* Figure out what tiling and address mode to use.
> +    * Textures are TILED or LINEAR. If LINEAR_TEXTURE_SUPPORT capability is
> +    * available LINEAR gets prefered.
>      * Buffers always have LINEAR layout.
>      */
>     unsigned layout = ETNA_LAYOUT_LINEAR;
> @@ -334,6 +334,10 @@ etna_resource_create(struct pipe_screen *pscreen,
>  
>        if (util_format_is_compressed(templat->format))
>           layout = ETNA_LAYOUT_LINEAR;
> +      else if (VIV_FEATURE(screen, chipMinorFeatures1, LINEAR_TEXTURE_SUPPORT)) {
> +         layout = ETNA_LAYOUT_LINEAR;
> +         mode = ETNA_ADDRESSING_MODE_LINEAR;
> +      }
>     } else if (templat->target != PIPE_BUFFER) {
>        bool want_multitiled = false;
>        bool want_supertiled = screen->specs.can_supertile;
> diff --git a/src/gallium/drivers/etnaviv/etnaviv_texture.c b/src/gallium/drivers/etnaviv/etnaviv_texture.c
> index 3993e31cec1..b06f20531fd 100644
> --- a/src/gallium/drivers/etnaviv/etnaviv_texture.c
> +++ b/src/gallium/drivers/etnaviv/etnaviv_texture.c
> @@ -172,7 +172,9 @@ etna_resource_sampler_compatible(struct etna_resource *res)
>     if (res->layout == ETNA_LAYOUT_SUPER_TILED && VIV_FEATURE(screen, chipMinorFeatures2, SUPERTILED_TEXTURE))
>        return true;
>  
> -   /* TODO: LINEAR_TEXTURE_SUPPORT */
> +   /* This GPU supports texturing from linear textures? */
> +   if (res->layout == ETNA_LAYOUT_LINEAR && VIV_FEATURE(screen, chipMinorFeatures1, LINEAR_TEXTURE_SUPPORT))
> +      return true;

In order to avoid this sitting on the ML for too long while mostly
looking good: how would you feel about squashing this last hunk into
the previous patch and dropping the other parts of this patch for now?

This way we could have most of the stuff in master and do further
experiments about the performance implications later on. If you want to
do this, patches 1-3 are:

Reviewed-by: Lucas Stach <l.stach at pengutronix.de>

Regards,
Lucas