Am 09.09.2015 um 12:35 schrieb Krzesimir Nowak:
> These functions will be used by textureQueryLod.
> ---
> src/gallium/drivers/softpipe/sp_tex_sample.c | 100
> +++++++++++++++++++++++++--
> src/gallium/drivers/softpipe/sp_tex_sample.h | 7 ++
> 2 files changed, 101 insertions(+), 6 deletions(-)
>
> diff --git a/src/gallium/drivers/softpipe/sp_tex_sample.c
> b/src/gallium/drivers/softpipe/sp_tex_sample.c
> index cdec984..6e639e0 100644
> --- a/src/gallium/drivers/softpipe/sp_tex_sample.c
> +++ b/src/gallium/drivers/softpipe/sp_tex_sample.c
> @@ -1937,6 +1937,38 @@ get_gather_component(const float
> lod_in[TGSI_QUAD_SIZE])
> }
>
> static void
> +clamp_lod(const struct sp_sampler_view *sp_sview,
> + const struct sp_sampler *sp_samp,
> + const float lod[TGSI_QUAD_SIZE],
> + float clamped[TGSI_QUAD_SIZE])
> +{
> + const float min_lod = sp_samp->base.min_lod;
> + const float max_lod = sp_samp->base.max_lod;
> + const float min_level = sp_sview->base.u.tex.first_level;
> + const float max_level = sp_sview->base.u.tex.last_level;
> + int i;
> +
> + for (i = 0; i < TGSI_QUAD_SIZE; i++) {
> + float cl = lod[i];
> +
> + cl = CLAMP(cl, min_lod, max_lod);
> + /* XXX: Is min_level ever different from 0?
I think the comment is bogus. min_level can easily be different from 0,
at least when using ARB_texture_view afaik (playing around with base
level might also cause this to be non-zero, though I'm not too familiar
with what the state tracker does for those legacy GL weirdness things).
> + */
> + cl = CLAMP(cl, 0, max_level - min_level);
> + clamped[i] = cl;
> + }
> +}
> +
> +static void
> +mip_level_linear(struct sp_sampler_view *sp_sview,
> + struct sp_sampler *sp_samp,
> + const float lod[TGSI_QUAD_SIZE],
> + float level[TGSI_QUAD_SIZE])
> +{
> + clamp_lod(sp_sview, sp_samp, lod, level);
> +}
> +
> +static void
> mip_filter_linear(struct sp_sampler_view *sp_sview,
> struct sp_sampler *sp_samp,
> img_filter_func min_filter,
> @@ -1998,6 +2030,23 @@ mip_filter_linear(struct sp_sampler_view *sp_sview,
> }
>
>
> +static void
> +mip_level_nearest(struct sp_sampler_view *sp_sview,
> + struct sp_sampler *sp_samp,
> + const float lod[TGSI_QUAD_SIZE],
> + float level[TGSI_QUAD_SIZE])
> +{
> + const int first_level = sp_sview->base.u.tex.first_level;
> + int j;
> +
> + clamp_lod(sp_sview, sp_samp, lod, level);
> + for (j = 0; j < TGSI_QUAD_SIZE; j++)
> + /* TODO: It should rather be:
> + * level[j] = first_level + ceil(level[j] + 0.5F) - 1.0F;
> + */
> + level[j] = first_level + (int)(level[j] + 0.5F);
> +}
> +
> /**
> * Compute nearest mipmap level from texcoords.
> * Then sample the texture level for four elements of a quad.
> @@ -2050,6 +2099,19 @@ mip_filter_nearest(struct sp_sampler_view *sp_sview,
>
>
> static void
> +mip_level_none(struct sp_sampler_view *sp_sview,
> + struct sp_sampler *sp_samp,
> + const float lod[TGSI_QUAD_SIZE],
> + float level[TGSI_QUAD_SIZE])
> +{
> + int j;
> +
> + for (j = 0; j < TGSI_QUAD_SIZE; j++) {
> + level[j] = sp_sview->base.u.tex.first_level;
> + }
> +}
> +
> +static void
> mip_filter_none(struct sp_sampler_view *sp_sview,
> struct sp_sampler *sp_samp,
> img_filter_func min_filter,
> @@ -2088,6 +2150,15 @@ mip_filter_none(struct sp_sampler_view *sp_sview,
>
>
> static void
> +mip_level_none_no_filter_select(struct sp_sampler_view *sp_sview,
> + struct sp_sampler *sp_samp,
> + const float lod[TGSI_QUAD_SIZE],
> + float level[TGSI_QUAD_SIZE])
> +{
> + mip_level_none(sp_sview, sp_samp, lod, level);
> +}
> +
> +static void
> mip_filter_none_no_filter_select(struct sp_sampler_view *sp_sview,
> struct sp_sampler *sp_samp,
> img_filter_func min_filter,
> @@ -2339,6 +2410,15 @@ img_filter_2d_ewa(struct sp_sampler_view *sp_sview,
> }
>
>
> +static void
> +mip_level_linear_aniso(struct sp_sampler_view *sp_sview,
> + struct sp_sampler *sp_samp,
> + const float lod[TGSI_QUAD_SIZE],
> + float level[TGSI_QUAD_SIZE])
> +{
> + mip_level_linear(sp_sview, sp_samp, lod, level);
> +}
> +
> /**
> * Sample 2D texture using an anisotropic filter.
> */
> @@ -2450,6 +2530,14 @@ mip_filter_linear_aniso(struct sp_sampler_view
> *sp_sview,
> }
> }
>
> +static void
> +mip_level_linear_2d_linear_repeat_POT(struct sp_sampler_view *sp_sview,
> + struct sp_sampler *sp_samp,
> + const float lod[TGSI_QUAD_SIZE],
> + float level[TGSI_QUAD_SIZE])
> +{
> + mip_level_linear(sp_sview, sp_samp, lod, level);
> +}
>
> /**
> * Specialized version of mip_filter_linear with hard-wired calls to
> @@ -2515,12 +2603,12 @@ mip_filter_linear_2d_linear_repeat_POT(
> }
> }
>
> -static struct sp_mip mip_linear = {mip_filter_linear};
> -static struct sp_mip mip_nearest = {mip_filter_nearest};
> -static struct sp_mip mip_none = {mip_filter_none};
> -static struct sp_mip mip_none_no_filter_select =
> {mip_filter_none_no_filter_select};
> -static struct sp_mip mip_linear_aniso = {mip_filter_linear_aniso};
> -static struct sp_mip mip_linear_2d_linear_repeat_POT =
> {mip_filter_linear_2d_linear_repeat_POT};
> +static struct sp_mip mip_linear = {mip_level_linear, mip_filter_linear};
> +static struct sp_mip mip_nearest = {mip_level_nearest, mip_filter_nearest};
> +static struct sp_mip mip_none = {mip_level_none, mip_filter_none};
> +static struct sp_mip mip_none_no_filter_select =
> {mip_level_none_no_filter_select, mip_filter_none_no_filter_select};
> +static struct sp_mip mip_linear_aniso = {mip_level_linear_aniso,
> mip_filter_linear_aniso};
> +static struct sp_mip mip_linear_2d_linear_repeat_POT =
> {mip_level_linear_2d_linear_repeat_POT,
> mip_filter_linear_2d_linear_repeat_POT};
>
> /**
> * Do shadow/depth comparisons.
> diff --git a/src/gallium/drivers/softpipe/sp_tex_sample.h
> b/src/gallium/drivers/softpipe/sp_tex_sample.h
> index 7739f59..89cf9d1 100644
> --- a/src/gallium/drivers/softpipe/sp_tex_sample.h
> +++ b/src/gallium/drivers/softpipe/sp_tex_sample.h
> @@ -87,6 +87,12 @@ typedef void (*mip_filter_func)(struct sp_sampler_view
> *sp_sview,
> float
> rgba[TGSI_NUM_CHANNELS][TGSI_QUAD_SIZE]);
>
>
> +typedef void (*mip_level_func)(struct sp_sampler_view *sp_sview,
> + struct sp_sampler *sp_samp,
> + const float lod[TGSI_QUAD_SIZE],
> + float level[TGSI_QUAD_SIZE]);
> +
> +
> typedef void (*convert_func)(struct sp_sampler_view *sp_sview,
> struct sp_sampler *sp_samp,
> const float s[TGSI_QUAD_SIZE],
> @@ -129,6 +135,7 @@ struct sp_sampler_view
> };
>
> struct sp_mip {
> + mip_level_func level;
> mip_filter_func filter;
> };
>
>
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