iris: Use modfiy disables for 3DSTATE_WM_DEPTH_STENCIL command

Add new IRIS_DIRTY_STENCIL_REF dirty flag which would help us to trigger
separate 3DSTATE_WM_DEPTH_STENCIL packet using modify disable fields.

Instead of merging two packets into one in order to build
3DSTATE_WM_DEPTH_STENCIL state, set_stencil_ref can use
IRIS_DIRTY_STENCIL_REF bit and bind_zsa_state can use
IRIS_DIRTY_WN_DEPTH_STENCIL, both could cause packet to happen with
available information using modify disable bits which allow us to
construct packet by ignoring set of fields.

v2: (Kenneth Graunke)
- Fix condition ordering.
- Club GEN cases.

Signed-off-by: Sagar Ghuge <[email protected]>
Reviewed-by: Kenneth Graunke <[email protected]>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/3688>

2 files changed, 32 insertions, 4 deletions

diff --git a/src/gallium/drivers/iris/iris_context.h b/src/gallium/drivers/iris/iris_context.h
index 4acf2390e2f..9d681a5826e 100644
--- a/src/gallium/drivers/iris/iris_context.h
+++ b/src/gallium/drivers/iris/iris_context.h
@@ -139,6 +139,7 @@ enum {
 #define IRIS_DIRTY_PMA_FIX                  (1ull << 58)
 #define IRIS_DIRTY_DEPTH_BOUNDS             (1ull << 59)
 #define IRIS_DIRTY_RENDER_BUFFER            (1ull << 60)
+#define IRIS_DIRTY_STENCIL_REF              (1ull << 61)
 
 #define IRIS_ALL_DIRTY_FOR_COMPUTE (IRIS_DIRTY_CS | \
                                     IRIS_DIRTY_SAMPLER_STATES_CS | \
diff --git a/src/gallium/drivers/iris/iris_state.c b/src/gallium/drivers/iris/iris_state.c
index 284d9d69e77..136297fd197 100644
--- a/src/gallium/drivers/iris/iris_state.c
+++ b/src/gallium/drivers/iris/iris_state.c
@@ -1361,6 +1361,9 @@ iris_create_zsa_state(struct pipe_context *ctx,
       wmds.BackfaceStencilTestMask = state->stencil[1].valuemask;
       wmds.BackfaceStencilWriteMask = state->stencil[1].writemask;
       /* wmds.[Backface]StencilReferenceValue are merged later */
+#if GEN_GEN >= 12
+      wmds.StencilReferenceValueModifyDisable = true;
+#endif
    }
 
 #if GEN_GEN >= 12
@@ -2936,10 +2939,12 @@ iris_set_stencil_ref(struct pipe_context *ctx,
 {
    struct iris_context *ice = (struct iris_context *) ctx;
    memcpy(&ice->state.stencil_ref, state, sizeof(*state));
-   if (GEN_GEN == 8)
-      ice->state.dirty |= IRIS_DIRTY_COLOR_CALC_STATE;
-   else
+   if (GEN_GEN >= 12)
+      ice->state.dirty |= IRIS_DIRTY_STENCIL_REF;
+   else if (GEN_GEN >= 9)
       ice->state.dirty |= IRIS_DIRTY_WM_DEPTH_STENCIL;
+   else
+      ice->state.dirty |= IRIS_DIRTY_COLOR_CALC_STATE;
 }
 
 static float
@@ -5880,7 +5885,7 @@ iris_upload_dirty_render_state(struct iris_context *ice,
 
    if (dirty & IRIS_DIRTY_WM_DEPTH_STENCIL) {
       struct iris_depth_stencil_alpha_state *cso = ice->state.cso_zsa;
-#if GEN_GEN >= 9
+#if GEN_GEN >= 9 && GEN_GEN < 12
       struct pipe_stencil_ref *p_stencil_refs = &ice->state.stencil_ref;
       uint32_t stencil_refs[GENX(3DSTATE_WM_DEPTH_STENCIL_length)];
       iris_pack_command(GENX(3DSTATE_WM_DEPTH_STENCIL), &stencil_refs, wmds) {
@@ -5889,6 +5894,9 @@ iris_upload_dirty_render_state(struct iris_context *ice,
       }
       iris_emit_merge(batch, cso->wmds, stencil_refs, ARRAY_SIZE(cso->wmds));
 #else
+      /* Use modify disable fields which allow us to emit packets
+       * directly instead of merging them later.
+       */
       iris_batch_emit(batch, cso->wmds, sizeof(cso->wmds));
 #endif
 
@@ -5897,6 +5905,25 @@ iris_upload_dirty_render_state(struct iris_context *ice,
 #endif
    }
 
+   if (dirty & IRIS_DIRTY_STENCIL_REF) {
+#if GEN_GEN >= 12
+      /* Use modify disable fields which allow us to emit packets
+       * directly instead of merging them later.
+       */
+      struct pipe_stencil_ref *p_stencil_refs = &ice->state.stencil_ref;
+      uint32_t stencil_refs[GENX(3DSTATE_WM_DEPTH_STENCIL_length)];
+      iris_pack_command(GENX(3DSTATE_WM_DEPTH_STENCIL), &stencil_refs, wmds) {
+         wmds.StencilReferenceValue = p_stencil_refs->ref_value[0];
+         wmds.BackfaceStencilReferenceValue = p_stencil_refs->ref_value[1];
+         wmds.StencilTestMaskModifyDisable = true;
+         wmds.StencilWriteMaskModifyDisable = true;
+         wmds.StencilStateModifyDisable = true;
+         wmds.DepthStateModifyDisable = true;
+      }
+      iris_batch_emit(batch, stencil_refs, sizeof(stencil_refs));
+#endif
+   }
+
    if (dirty & IRIS_DIRTY_SCISSOR_RECT) {
       uint32_t scissor_offset =
          emit_state(batch, ice->state.dynamic_uploader,