i965: Update the indirect buffer in set_clear_color

For depth buffers, we avoid fast-clearing if the aux_state is already
CLEAR. We do the same for color buffers only if the clear color
doesn't change. We require that the clear colors match because, in
that case, we don't update the indirect clear color outside of BLORP.

Update the indirect clear color for color buffers as well. We'll
enable the same depth buffer optimization for color buffers in a
later patch.

Note that we're now actually updating the indirect clear color twice
in the case where we use BLORP to perform the fast-clear. This is
only temporary. In later patches, we'll prevent BLORP from performing
the update.

v2: Add more context to the commit message (Topi).

Reviewed-by: Jason Ekstrand <[email protected]>
Reviewed-by: Topi Pohjolainen <[email protected]>

2 files changed, 13 insertions, 37 deletions

diff --git a/src/mesa/drivers/dri/i965/brw_clear.c b/src/mesa/drivers/dri/i965/brw_clear.c
index ba79447fc87..a65839a0a05 100644
--- a/src/mesa/drivers/dri/i965/brw_clear.c
+++ b/src/mesa/drivers/dri/i965/brw_clear.c
@@ -108,7 +108,6 @@ brw_fast_clear_depth(struct gl_context *ctx)
    struct intel_mipmap_tree *mt = depth_irb->mt;
    struct gl_renderbuffer_attachment *depth_att = &fb->Attachment[BUFFER_DEPTH];
    const struct gen_device_info *devinfo = &brw->screen->devinfo;
-   bool same_clear_value = true;
 
    if (devinfo->gen < 6)
       return false;
@@ -215,42 +214,6 @@ brw_fast_clear_depth(struct gl_context *ctx)
 
       const union isl_color_value clear_color = { .f32 = {clear_value, } };
       intel_miptree_set_clear_color(brw, mt, clear_color);
-      same_clear_value = false;
-   }
-
-   bool need_clear = false;
-   for (unsigned a = 0; a < num_layers; a++) {
-      enum isl_aux_state aux_state =
-         intel_miptree_get_aux_state(mt, depth_irb->mt_level,
-                                     depth_irb->mt_layer + a);
-
-      if (aux_state != ISL_AUX_STATE_CLEAR) {
-         need_clear = true;
-         break;
-      }
-   }
-
-   if (!need_clear) {
-      if (devinfo->gen >= 10 && !same_clear_value) {
-         /* Before gen10, it was enough to just update the clear value in the
-          * miptree. But on gen10+, we let blorp update the clear value state
-          * buffer when doing a fast clear. Since we are skipping the fast
-          * clear here, we need to update the clear color ourselves.
-          */
-         uint32_t clear_offset = mt->aux_buf->clear_color_offset;
-         union isl_color_value clear_color = { .f32 = { clear_value, } };
-
-         /* We can't update the clear color while the hardware is still using
-          * the previous one for a resolve or sampling from it. So make sure
-          * that there's no pending commands at this point.
-          */
-         brw_emit_pipe_control_flush(brw, PIPE_CONTROL_CS_STALL);
-         for (int i = 0; i < 4; i++) {
-            brw_store_data_imm32(brw, mt->aux_buf->clear_color_bo,
-                                 clear_offset + i * 4, clear_color.u32[i]);
-         }
-         brw_emit_pipe_control_flush(brw, PIPE_CONTROL_STATE_CACHE_INVALIDATE);
-      }
    }
 
    for (unsigned a = 0; a < num_layers; a++) {
diff --git a/src/mesa/drivers/dri/i965/intel_mipmap_tree.c b/src/mesa/drivers/dri/i965/intel_mipmap_tree.c
index 88db0fc80b7..0c7c89a9ac4 100644
--- a/src/mesa/drivers/dri/i965/intel_mipmap_tree.c
+++ b/src/mesa/drivers/dri/i965/intel_mipmap_tree.c
@@ -3728,6 +3728,19 @@ intel_miptree_set_clear_color(struct brw_context *brw,
 {
    if (memcmp(&mt->fast_clear_color, &clear_color, sizeof(clear_color)) != 0) {
       mt->fast_clear_color = clear_color;
+      if (mt->aux_buf->clear_color_bo) {
+         /* We can't update the clear color while the hardware is still using
+          * the previous one for a resolve or sampling from it. Make sure that
+          * there are no pending commands at this point.
+          */
+         brw_emit_pipe_control_flush(brw, PIPE_CONTROL_CS_STALL);
+         for (int i = 0; i < 4; i++) {
+            brw_store_data_imm32(brw, mt->aux_buf->clear_color_bo,
+                                 mt->aux_buf->clear_color_offset + i * 4,
+                                 mt->fast_clear_color.u32[i]);
+         }
+         brw_emit_pipe_control_flush(brw, PIPE_CONTROL_STATE_CACHE_INVALIDATE);
+      }
       brw->ctx.NewDriverState |= BRW_NEW_AUX_STATE;
       return true;
    }