freedreno: skip depth resolve if not written

For multi-pass rendering, it is common to keep the same depth buffer
from previous pass, to discard geometry that would be hidden by later
draws.  In the later passes with depth-test enabled, but depth-write
disabled, there is no reason to do gmem2mem resolve.

TODO probably do something similar for stencil.. although stencil
buffer isn't used as commonly these days

Signed-off-by: Rob Clark <[email protected]>

1 files changed, 5 insertions, 0 deletions

diff --git a/src/gallium/drivers/freedreno/freedreno_state.h b/src/gallium/drivers/freedreno/freedreno_state.h
index 35584e41e3a..ad2c4943ec8 100644
--- a/src/gallium/drivers/freedreno/freedreno_state.h
+++ b/src/gallium/drivers/freedreno/freedreno_state.h
@@ -35,6 +35,11 @@ static inline bool fd_depth_enabled(struct fd_context *ctx)
 	return ctx->zsa && ctx->zsa->depth.enabled;
 }
 
+static inline bool fd_depth_write_enabled(struct fd_context *ctx)
+{
+	return ctx->zsa && ctx->zsa->depth.writemask;
+}
+
 static inline bool fd_stencil_enabled(struct fd_context *ctx)
 {
 	return ctx->zsa && ctx->zsa->stencil[0].enabled;