Mesa (main): zink: store the last vertex stage to the context during bind

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Module: Mesa
Branch: main
Commit: cc438ba58a2fe7929fa6687e510bcb5dae75d1c0
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=cc438ba58a2fe7929fa6687e510bcb5dae75d1c0

Author: Mike Blumenkrantz <michael.blumenkrantz at gmail.com>
Date:   Tue May 11 12:39:42 2021 -0400

zink: store the last vertex stage to the context during bind

make this more readily accessible

Reviewed-by: Dave Airlie <airlied at redhat.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/11746>

---

 src/gallium/drivers/zink/zink_context.h |  1 +
 src/gallium/drivers/zink/zink_program.c | 28 +++++++++++++++++++++++++++-
 src/gallium/drivers/zink/zink_program.h |  2 ++
 3 files changed, 30 insertions(+), 1 deletion(-)

diff --git a/src/gallium/drivers/zink/zink_context.h b/src/gallium/drivers/zink/zink_context.h
index 825593e26d7..f6ab6f16d07 100644
--- a/src/gallium/drivers/zink/zink_context.h
+++ b/src/gallium/drivers/zink/zink_context.h
@@ -174,6 +174,7 @@ struct zink_context {
    bool pipeline_changed[2]; //gfx, compute
 
    struct zink_shader *gfx_stages[ZINK_SHADER_COUNT];
+   struct zink_shader *last_vertex_stage;
    struct zink_gfx_pipeline_state gfx_pipeline_state;
    enum pipe_prim_type gfx_prim_mode;
    struct hash_table *program_cache;
diff --git a/src/gallium/drivers/zink/zink_program.c b/src/gallium/drivers/zink/zink_program.c
index 3339884823d..7f3a0d1fcea 100644
--- a/src/gallium/drivers/zink/zink_program.c
+++ b/src/gallium/drivers/zink/zink_program.c
@@ -471,6 +471,13 @@ zink_create_gfx_program(struct zink_context *ctx,
          goto fail;
    }
 
+   if (stages[PIPE_SHADER_GEOMETRY])
+      prog->last_vertex_stage = stages[PIPE_SHADER_GEOMETRY];
+   else if (stages[PIPE_SHADER_TESS_EVAL])
+      prog->last_vertex_stage = stages[PIPE_SHADER_TESS_EVAL];
+   else
+      prog->last_vertex_stage = stages[PIPE_SHADER_VERTEX];
+
    struct mesa_sha1 sctx;
    _mesa_sha1_init(&sctx);
    for (int i = 0; i < ZINK_SHADER_COUNT; ++i) {
@@ -906,7 +913,12 @@ static void
 zink_bind_vs_state(struct pipe_context *pctx,
                    void *cso)
 {
-   bind_stage(zink_context(pctx), PIPE_SHADER_VERTEX, cso);
+   struct zink_context *ctx = zink_context(pctx);
+   bind_stage(ctx, PIPE_SHADER_VERTEX, cso);
+   if (!ctx->gfx_stages[PIPE_SHADER_GEOMETRY] &&
+       !ctx->gfx_stages[PIPE_SHADER_TESS_EVAL]) {
+      ctx->last_vertex_stage = cso;
+   }
 }
 
 static void
@@ -925,6 +937,14 @@ zink_bind_gs_state(struct pipe_context *pctx,
       ctx->dirty_shader_stages |= BITFIELD_BIT(PIPE_SHADER_VERTEX) |
                                   BITFIELD_BIT(PIPE_SHADER_TESS_EVAL);
    bind_stage(ctx, PIPE_SHADER_GEOMETRY, cso);
+   if (cso)
+      ctx->last_vertex_stage = cso;
+   else {
+      if (ctx->gfx_stages[PIPE_SHADER_TESS_EVAL])
+         ctx->last_vertex_stage = ctx->gfx_stages[PIPE_SHADER_TESS_EVAL];
+      else
+         ctx->last_vertex_stage = ctx->gfx_stages[PIPE_SHADER_VERTEX];
+   }
 }
 
 static void
@@ -948,6 +968,12 @@ zink_bind_tes_state(struct pipe_context *pctx,
       ctx->dirty_shader_stages |= BITFIELD_BIT(PIPE_SHADER_VERTEX);
    }
    bind_stage(ctx, PIPE_SHADER_TESS_EVAL, cso);
+   if (!ctx->gfx_stages[PIPE_SHADER_GEOMETRY]) {
+      if (cso)
+         ctx->last_vertex_stage = cso;
+      else
+         ctx->last_vertex_stage = ctx->gfx_stages[PIPE_SHADER_VERTEX];
+   }
 }
 
 static void *
diff --git a/src/gallium/drivers/zink/zink_program.h b/src/gallium/drivers/zink/zink_program.h
index 087a0fa0124..a7dbe855d40 100644
--- a/src/gallium/drivers/zink/zink_program.h
+++ b/src/gallium/drivers/zink/zink_program.h
@@ -95,6 +95,8 @@ struct zink_gfx_program {
 
    struct zink_shader_module *default_variants[ZINK_SHADER_COUNT][2]; //[default, no streamout]
    const void *default_variant_key[ZINK_SHADER_COUNT];
+   struct zink_shader *last_vertex_stage;
+
    struct zink_shader *shaders[ZINK_SHADER_COUNT];
    struct hash_table *pipelines[11]; // number of draw modes we support
 };