On Fri, Nov 21, 2014 at 3:09 PM, Jordan Justen
<jordan.l.jus...@intel.com> wrote:
> We now skip allocating a hiz miptree for gen8. Instead, we calculate
> the required hiz buffer parameters and allocate a bo directly.
>
> v2:
> * Update hz_height calculation as suggested by Topi
> v3:
> * Bail if we failed to create the bo (Ben)
>
> Signed-off-by: Jordan Justen <jordan.l.jus...@intel.com>
> Reviewed-by: Topi Pohjolainen <topi.pohjolai...@intel.com>
> ---
> src/mesa/drivers/dri/i965/intel_mipmap_tree.c | 100
> ++++++++++++++++++++++++++
> 1 file changed, 100 insertions(+)
>
> diff --git a/src/mesa/drivers/dri/i965/intel_mipmap_tree.c
> b/src/mesa/drivers/dri/i965/intel_mipmap_tree.c
> index e6ee8d7..c62b0b8 100644
> --- a/src/mesa/drivers/dri/i965/intel_mipmap_tree.c
> +++ b/src/mesa/drivers/dri/i965/intel_mipmap_tree.c
> @@ -1497,6 +1497,104 @@ intel_gen7_hiz_buf_create(struct brw_context *brw,
> }
>
>
> +/**
> + * Helper for intel_miptree_alloc_hiz() that determines the required hiz
> + * buffer dimensions and allocates a bo for the hiz buffer.
> + */
> +static struct intel_miptree_aux_buffer *
> +intel_gen8_hiz_buf_create(struct brw_context *brw,
> + struct intel_mipmap_tree *mt)
> +{
> + unsigned z_width = mt->logical_width0;
> + unsigned z_height = mt->logical_height0;
> + const unsigned z_depth = mt->logical_depth0;
> + unsigned hz_width, hz_height;
> + struct intel_miptree_aux_buffer *buf = calloc(sizeof(*buf), 1);
> +
> + if (!buf)
> + return NULL;
> +
> + /* Gen7 PRM Volume 2, Part 1, 11.5.3 "Hierarchical Depth Buffer" documents
> + * adjustments required for Z_Height and Z_Width based on multisampling.
> + */
> + switch (mt->num_samples) {
> + case 0:
> + case 1:
> + break;
> + case 2:
> + case 4:
> + z_width *= 2;
> + z_height *= 2;
> + break;
> + case 8:
> + z_width *= 4;
> + z_height *= 2;
> + break;
> + default:
> + assert(!"Unsupported sample count!");
Use unreachable().
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