vc4: Add support for depth clears and tests within a tile.

This doesn't load/store the Z contents across submits yet.  It also
disables early Z, since it's going to require tracking of Z functions
across multiple state updates to track the early Z direction and whether
it can be used.

v2: Move the key setup to before the search for the key.

1 files changed, 9 insertions, 1 deletions

diff --git a/src/gallium/drivers/vc4/vc4_context.h b/src/gallium/drivers/vc4/vc4_context.h
index d6367871358..fe51072180b 100644
--- a/src/gallium/drivers/vc4/vc4_context.h
+++ b/src/gallium/drivers/vc4/vc4_context.h
@@ -143,6 +143,7 @@ struct vc4_context {
          */
         uint32_t resolve;
         uint32_t clear_color[2];
+        uint32_t clear_depth; /**< 24-bit unorm depth */
 
         /**
          * Set if some drawing (triangles, blits, or just a glClear()) has
@@ -165,7 +166,7 @@ struct vc4_context {
         struct pipe_scissor_state scissor;
         struct pipe_blend_state *blend;
         struct vc4_rasterizer_state *rasterizer;
-        struct pipe_depth_stencil_alpha_state *zsa;
+        struct vc4_depth_stencil_alpha_state *zsa;
 
         struct vc4_texture_stateobj verttex, fragtex;
 
@@ -194,6 +195,13 @@ struct vc4_rasterizer_state {
         float point_size;
 };
 
+struct vc4_depth_stencil_alpha_state {
+        struct pipe_depth_stencil_alpha_state base;
+
+        /* VC4_CONFIGURATION_BITS */
+        uint8_t config_bits[3];
+};
+
 static inline struct vc4_context *
 vc4_context(struct pipe_context *pcontext)
 {