i965: Add gen8 fast clear perf debug

In an ideal world I would just implement this instead of adding the perf debug.
There are some errata involved which lead me to believe it won't be so simple as
flipping a few bits.

There is room to add a thing for Gen9s flexibility, but since I am actively
working on that I have opted to ignore it.

Example:
Multi-LOD fast clear - giving up (256x128x8).

v2: Use braces for if statements because they are multiple lines (Ken)

Signed-off-by: Ben Widawsky <[email protected]>
Reviewed-by: Kenneth Graunke <[email protected]>

2 files changed, 19 insertions, 2 deletions

diff --git a/src/mesa/drivers/dri/i965/brw_meta_fast_clear.c b/src/mesa/drivers/dri/i965/brw_meta_fast_clear.c
index a864143e6dc..c0c8dfa608d 100644
--- a/src/mesa/drivers/dri/i965/brw_meta_fast_clear.c
+++ b/src/mesa/drivers/dri/i965/brw_meta_fast_clear.c
@@ -340,6 +340,10 @@ is_color_fast_clear_compatible(struct brw_context *brw,
                                const union gl_color_union *color)
 {
    if (_mesa_is_format_integer_color(format))
+      if (brw->gen >= 8) {
+         perf_debug("Integer fast clear not enabled for (%s)",
+                    _mesa_get_format_name(format));
+      }
       return false;
 
    for (int i = 0; i < 4; i++) {
diff --git a/src/mesa/drivers/dri/i965/intel_mipmap_tree.c b/src/mesa/drivers/dri/i965/intel_mipmap_tree.c
index 24a5c3dc666..8616c0193c8 100644
--- a/src/mesa/drivers/dri/i965/intel_mipmap_tree.c
+++ b/src/mesa/drivers/dri/i965/intel_mipmap_tree.c
@@ -198,10 +198,23 @@ intel_is_non_msrt_mcs_buffer_supported(struct brw_context *brw,
       return false;
    if (mt->cpp != 4 && mt->cpp != 8 && mt->cpp != 16)
       return false;
-   if (mt->first_level != 0 || mt->last_level != 0)
+   if (mt->first_level != 0 || mt->last_level != 0) {
+      if (brw->gen >= 8) {
+         perf_debug("Multi-LOD fast clear - giving up (%dx%dx%d).\n",
+                    mt->logical_width0, mt->logical_height0, mt->last_level);
+      }
+
       return false;
-   if (mt->physical_depth0 != 1)
+   }
+   if (mt->physical_depth0 != 1) {
+      if (brw->gen >= 8) {
+         perf_debug("Layered fast clear - giving up. (%dx%d%d)\n",
+                    mt->logical_width0, mt->logical_height0,
+                    mt->physical_depth0);
+      }
+
       return false;
+   }
 
    /* There's no point in using an MCS buffer if the surface isn't in a
     * renderable format.