panfrost: Disable AFBC on sRGB buffers

The performance impact is slightly mitigated by tiling the render
target, but it's undeniably still slow compared to AFBC. Unfortunately,
it doesn't look like AFBC and sRGB play nice...

Signed-off-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>

diff --git a/src/gallium/drivers/panfrost/pan_afbc.c b/src/gallium/drivers/panfrost/pan_afbc.c
index 0bb9d2491c66fadde6033ee32a803c0ce9fe5304..4bef833f18201e4a89d277dd854881a5cbcfc603 100644 (file)
--- a/src/gallium/drivers/panfrost/pan_afbc.c
+++ b/src/gallium/drivers/panfrost/pan_afbc.c
@@ -83,6 +83,13 @@ panfrost_format_supports_afbc(enum pipe_format format)
         const struct util_format_description *desc =
                 util_format_description(format);
 
+        /* sRGB cannot be AFBC, but it can be tiled. TODO: Verify. The blob
+         * does not do AFBC for SRGB8_ALPHA8, but it's not clear why it
+         * shouldn't be able to. */
+
+        if (desc->colorspace == UTIL_FORMAT_COLORSPACE_SRGB)
+                return false;
+
         if (util_format_is_rgba8_variant(desc))
                 return true;