When GL_FRAMEBUFFER_SRGB is enabled any single-sampled renderbuffers
are resolved in intel_update_state because the hardware can't cope
with fast clears on SRGB buffers. In that case it's pointless to do a
fast clear because it will just be immediately resolved.
---
src/mesa/drivers/dri/i965/brw_meta_fast_clear.c | 11 +++++++++++
1 file changed, 11 insertions(+)
diff --git a/src/mesa/drivers/dri/i965/brw_meta_fast_clear.c
b/src/mesa/drivers/dri/i965/brw_meta_fast_clear.c
index b32db3f..56c90b7 100644
--- a/src/mesa/drivers/dri/i965/brw_meta_fast_clear.c
+++ b/src/mesa/drivers/dri/i965/brw_meta_fast_clear.c
@@ -603,6 +603,17 @@ brw_meta_fast_clear(struct brw_context *brw, struct
gl_framebuffer *fb,
brw->render_target_format[irb->mt->format])
clear_type = REP_CLEAR;
+ /* Gen9 doesn't support fast clear on single-sampled SRGB buffers. When
+ * GL_FRAMEBUFFER_SRGB is enabled any color renderbuffers will be
+ * resolved in intel_update_state. In that case it's pointless to do a
+ * fast clear because it's very likely to be immediately resolved.
+ */
+ if (brw->gen >= 9 &&
+ irb->mt->num_samples <= 1 &&
+ brw->ctx.Color.sRGBEnabled &&
+ _mesa_get_srgb_format_linear(irb->mt->format) != irb->mt->format)
+ clear_type = REP_CLEAR;
+
if (irb->mt->fast_clear_state == INTEL_FAST_CLEAR_STATE_NO_MCS)
clear_type = REP_CLEAR;
--
1.9.3
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