On Thu, Feb 11, 2016 at 08:34:11PM +0200, Topi Pohjolainen wrote:
> v2: Use explicitly against base type of GL_FLOAT instead of
> using _mesa_is_format_integer_color(). Otherwise we miss
> GL_UNSIGNED_NORMALIZED.
>
> Signed-off-by: Topi Pohjolainen <topi.pohjolai...@intel.com>
> ---
> src/mesa/drivers/dri/i965/intel_mipmap_tree.c | 22 ++++++++++++++++++++++
> src/mesa/drivers/dri/i965/intel_mipmap_tree.h | 3 +++
> 2 files changed, 25 insertions(+)
>
> diff --git a/src/mesa/drivers/dri/i965/intel_mipmap_tree.c
> b/src/mesa/drivers/dri/i965/intel_mipmap_tree.c
> index 6c233d8..e9fbeeb 100644
> --- a/src/mesa/drivers/dri/i965/intel_mipmap_tree.c
> +++ b/src/mesa/drivers/dri/i965/intel_mipmap_tree.c
> @@ -294,6 +294,28 @@ intel_miptree_is_lossless_compressed(const struct
> brw_context *brw,
> return mt->num_samples <= 1;
> }
>
> +bool
> +intel_miptree_supports_lossless_compressed(mesa_format format)
> +{
> + /* For now compression is only enabled for integer formats even though
> + * there exist supported floating point formats also. This is a heuristic
> + * decision based on current public benchmarks. In none of the cases these
> + * formats provided any improvement but a few cases were seen to regress.
> + * Hence these are left to to be enabled in the future when they are known
> + * to improve things.
> + */
> + if (_mesa_get_format_datatype(format) == GL_FLOAT)
> + return false;
> +
> + /* In principle, fast clear mechanism and lossless compression go hand in
> + * hand. However, fast clear can be also used to clear srgb surfaces by
> + * using equivalent linear format. This trick, however, can't be extended
> + * to be used with lossless compression and therefore a check is needed to
> + * see if the format really is linear.
> + */
> + return _mesa_get_srgb_format_linear(format) == format;
> +}
> +
Hmm. Doesn't this need to use the ccs_e field in surface formats, or did I miss
something?
> /**
> * Determine depth format corresponding to a depth+stencil format,
> * for separate stencil.
> diff --git a/src/mesa/drivers/dri/i965/intel_mipmap_tree.h
> b/src/mesa/drivers/dri/i965/intel_mipmap_tree.h
> index 7cdfb37..6ce9f75 100644
> --- a/src/mesa/drivers/dri/i965/intel_mipmap_tree.h
> +++ b/src/mesa/drivers/dri/i965/intel_mipmap_tree.h
> @@ -679,6 +679,9 @@ intel_miptree_supports_non_msrt_fast_clear(struct
> brw_context *brw,
> const struct intel_mipmap_tree
> *mt);
>
> bool
> +intel_miptree_supports_lossless_compressed(mesa_format format);
> +
> +bool
> intel_miptree_alloc_non_msrt_mcs(struct brw_context *brw,
> struct intel_mipmap_tree *mt);
>
> --
> 2.5.0
>
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