Mesa (main): zink: track fbfetch info on context, update as needed

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Module: Mesa
Branch: main
Commit: d31b7dcefdfdce8916d5ba3a5a9edc5812d94196
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=d31b7dcefdfdce8916d5ba3a5a9edc5812d94196

Author: Mike Blumenkrantz <michael.blumenkrantz at gmail.com>
Date:   Tue Jul 27 13:59:39 2021 -0400

zink: track fbfetch info on context, update as needed

Reviewed-by: Dave Airlie <airlied at redhat.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/12603>

---

 src/gallium/drivers/zink/zink_context.c | 25 +++++++++++++++++++++++++
 src/gallium/drivers/zink/zink_context.h |  6 +++++-
 src/gallium/drivers/zink/zink_program.c | 14 +++++++++++++-
 3 files changed, 43 insertions(+), 2 deletions(-)

diff --git a/src/gallium/drivers/zink/zink_context.c b/src/gallium/drivers/zink/zink_context.c
index 09dd9abb1a5..e00398eea1e 100644
--- a/src/gallium/drivers/zink/zink_context.c
+++ b/src/gallium/drivers/zink/zink_context.c
@@ -1467,6 +1467,28 @@ zink_set_patch_vertices(struct pipe_context *pctx, uint8_t patch_vertices)
    ctx->gfx_pipeline_state.patch_vertices = patch_vertices;
 }
 
+void
+zink_update_fbfetch(struct zink_context *ctx)
+{
+   const bool had_fbfetch = ctx->di.fbfetch.imageLayout == VK_IMAGE_LAYOUT_GENERAL;
+   if (!ctx->gfx_stages[PIPE_SHADER_FRAGMENT] ||
+       !ctx->gfx_stages[PIPE_SHADER_FRAGMENT]->nir->info.fs.uses_fbfetch_output) {
+      if (!had_fbfetch)
+         return;
+      ctx->di.fbfetch.imageLayout = VK_IMAGE_LAYOUT_UNDEFINED;
+      ctx->di.fbfetch.imageView = zink_screen(ctx->base.screen)->info.rb2_feats.nullDescriptor ?
+                                  VK_NULL_HANDLE :
+                                  zink_surface(ctx->dummy_surface)->image_view;
+      return;
+   }
+
+   if (ctx->fb_state.cbufs[0]) {
+      VkImageView fbfetch = zink_surface(ctx->fb_state.cbufs[0])->image_view;
+      ctx->di.fbfetch.imageView = zink_surface(ctx->fb_state.cbufs[0])->image_view;
+   }
+   ctx->di.fbfetch.imageLayout = VK_IMAGE_LAYOUT_GENERAL;
+}
+
 static uint32_t
 hash_render_pass_state(const void *key)
 {
@@ -1975,6 +1997,7 @@ zink_set_framebuffer_state(struct pipe_context *pctx,
    unsigned h = ctx->fb_state.height;
 
    util_copy_framebuffer_state(&ctx->fb_state, state);
+   zink_update_fbfetch(ctx);
    unsigned prev_void_alpha_attachments = ctx->gfx_pipeline_state.void_alpha_attachments;
    ctx->gfx_pipeline_state.void_alpha_attachments = 0;
    for (int i = 0; i < ctx->fb_state.nr_cbufs; i++) {
@@ -3577,6 +3600,8 @@ zink_context_create(struct pipe_screen *pscreen, void *priv, unsigned flags)
          update_descriptor_state_image(ctx, i, j);
       }
    }
+   if (!screen->info.rb2_feats.nullDescriptor)
+      ctx->di.fbfetch.imageView = zink_surface(ctx->dummy_surface)->image_view;
    p_atomic_inc(&screen->base.num_contexts);
 
    zink_select_draw_vbo(ctx);
diff --git a/src/gallium/drivers/zink/zink_context.h b/src/gallium/drivers/zink/zink_context.h
index 5bb730890fa..e1475078621 100644
--- a/src/gallium/drivers/zink/zink_context.h
+++ b/src/gallium/drivers/zink/zink_context.h
@@ -235,6 +235,7 @@ struct zink_context {
    struct zink_framebuffer_clear fb_clears[PIPE_MAX_COLOR_BUFS + 1];
    uint16_t clears_enabled;
    uint16_t rp_clears_enabled;
+   uint16_t fbfetch_outputs;
 
    VkBuffer vbufs[PIPE_MAX_ATTRIBS];
    unsigned vbuf_offsets[PIPE_MAX_ATTRIBS];
@@ -299,6 +300,8 @@ struct zink_context {
       VkBufferView texel_images[PIPE_SHADER_TYPES][PIPE_MAX_SHADER_IMAGES];
       uint8_t num_images[PIPE_SHADER_TYPES];
 
+      VkDescriptorImageInfo fbfetch;
+
       struct zink_resource *descriptor_res[ZINK_DESCRIPTOR_TYPES][PIPE_SHADER_TYPES][PIPE_MAX_SAMPLERS];
       struct zink_descriptor_surface sampler_surfaces[PIPE_SHADER_TYPES][PIPE_MAX_SAMPLERS];
       struct zink_descriptor_surface image_surfaces[PIPE_SHADER_TYPES][PIPE_MAX_SHADER_IMAGES];
@@ -351,7 +354,8 @@ zink_check_batch_completion(struct zink_context *ctx, uint32_t batch_id, bool ha
 
 void
 zink_flush_queue(struct zink_context *ctx);
-
+void
+zink_update_fbfetch(struct zink_context *ctx);
 bool
 zink_resource_access_is_write(VkAccessFlags flags);
 
diff --git a/src/gallium/drivers/zink/zink_program.c b/src/gallium/drivers/zink/zink_program.c
index 91662f6472e..1e90ec8154d 100644
--- a/src/gallium/drivers/zink/zink_program.c
+++ b/src/gallium/drivers/zink/zink_program.c
@@ -945,7 +945,19 @@ static void
 zink_bind_fs_state(struct pipe_context *pctx,
                    void *cso)
 {
-   bind_stage(zink_context(pctx), PIPE_SHADER_FRAGMENT, cso);
+   struct zink_context *ctx = zink_context(pctx);
+   bind_stage(ctx, PIPE_SHADER_FRAGMENT, cso);
+   ctx->fbfetch_outputs = 0;
+   if (cso) {
+      nir_shader *nir = ctx->gfx_stages[PIPE_SHADER_FRAGMENT]->nir;
+      if (nir->info.fs.uses_fbfetch_output) {
+         nir_foreach_shader_out_variable(var, ctx->gfx_stages[PIPE_SHADER_FRAGMENT]->nir) {
+            if (var->data.fb_fetch_output)
+               ctx->fbfetch_outputs |= BITFIELD_BIT(var->data.location - FRAG_RESULT_DATA0);
+         }
+      }
+   }
+   zink_update_fbfetch(ctx);
 }
 
 static void