On Fri, Feb 20, 2015 at 2:31 PM, Neil Roberts <n...@linux.intel.com> wrote:
> On Gen9+ the 1D miptree is laid out with all of the mipmap levels in a
> horizontal line.
> ---
> src/mesa/drivers/dri/i965/brw_tex_layout.c | 62
> +++++++++++++++++++++++++++++-
> 1 file changed, 60 insertions(+), 2 deletions(-)
>
> diff --git a/src/mesa/drivers/dri/i965/brw_tex_layout.c
> b/src/mesa/drivers/dri/i965/brw_tex_layout.c
> index 57922e9..851742b 100644
> --- a/src/mesa/drivers/dri/i965/brw_tex_layout.c
> +++ b/src/mesa/drivers/dri/i965/brw_tex_layout.c
> @@ -158,6 +158,36 @@ intel_vertical_texture_alignment_unit(struct brw_context
> *brw,
> }
>
> static void
> +gen9_miptree_layout_1d(struct intel_mipmap_tree *mt)
> +{
> + unsigned x = 0;
> + unsigned width = mt->physical_width0;
> + unsigned depth = mt->physical_depth0; /* number of array layers. */
> +
> + /* When this layout is used the horizontal alignment is fixed at 64 and
> the
> + * hardware ignores the value given in the surface state
> + */
> + const unsigned int align_w = 64;
> +
> + mt->total_height = mt->physical_height0;
> + mt->total_width = 0;
> +
> + for (unsigned level = mt->first_level; level <= mt->last_level; level++) {
> + unsigned img_width;
> +
> + intel_miptree_set_level_info(mt, level, x, 0, depth);
> +
> + img_width = ALIGN(width, align_w);
> +
> + mt->total_width = MAX2(mt->total_width, x + img_width);
> +
> + x += img_width;
> +
> + width = minify(width, 1);
> + }
> +}
> +
> +static void
> brw_miptree_layout_2d(struct intel_mipmap_tree *mt)
> {
> unsigned x = 0;
> @@ -242,12 +272,34 @@ align_cube(struct intel_mipmap_tree *mt)
> mt->total_height += 2;
> }
>
> +static bool
> +use_linear_1d_layout(struct brw_context *brw,
> + struct intel_mipmap_tree *mt)
> +{
> + /* On Gen9+ the mipmap levels of a 1D surface are all laid out in a
> + * horizontal line. This isn't done for depth/stencil buffers however
> + * because those will be using a tiled layout
> + */
> + if (brw->gen >= 9 &&
> + (mt->target == GL_TEXTURE_1D ||
> + mt->target == GL_TEXTURE_1D_ARRAY)) {
> + GLenum base_format = _mesa_get_format_base_format(mt->format);
> +
> + if (base_format != GL_DEPTH_COMPONENT &&
> + base_format != GL_DEPTH_STENCIL)
&& base_format != GL_STENCIL_INDEX ?
You missed it or there is a reason to not do this check?
> + return true;
> + }
> +
> + return false;
> +}
> +
> static void
> brw_miptree_layout_texture_array(struct brw_context *brw,
> struct intel_mipmap_tree *mt)
> {
> int h0, h1;
> unsigned height = mt->physical_height0;
> + bool layout_1d = use_linear_1d_layout(brw, mt);
>
> h0 = ALIGN(mt->physical_height0, mt->align_h);
> h1 = ALIGN(minify(mt->physical_height0, 1), mt->align_h);
> @@ -258,7 +310,10 @@ brw_miptree_layout_texture_array(struct brw_context *brw,
>
> int physical_qpitch = mt->compressed ? mt->qpitch / 4 : mt->qpitch;
>
> - brw_miptree_layout_2d(mt);
> + if (layout_1d)
> + gen9_miptree_layout_1d(mt);
> + else
> + brw_miptree_layout_2d(mt);
>
> for (unsigned level = mt->first_level; level <= mt->last_level; level++) {
> unsigned img_height;
> @@ -392,7 +447,10 @@ brw_miptree_layout(struct brw_context *brw, struct
> intel_mipmap_tree *mt)
> break;
> case INTEL_MSAA_LAYOUT_NONE:
> case INTEL_MSAA_LAYOUT_IMS:
> - brw_miptree_layout_2d(mt);
> + if (use_linear_1d_layout(brw, mt))
> + gen9_miptree_layout_1d(mt);
> + else
> + brw_miptree_layout_2d(mt);
> break;
> }
> break;
> --
> 1.9.3
>
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