<div dir="ltr"><div>Perf numbers in the commit message would be nice </div>Reviewed-by: Jason Ekstrand <<a href="mailto:jason@jlekstrand.net">jason@jlekstrand.net</a>> </div><div class="gmail_extra"> <div class="gmail_quote">On Thu, Feb 2, 2017 at 8:15 AM, Nanley Chery <<a href="mailto:nanleychery@gmail.com" target="_blank">nanleychery@gmail.com</a>> wrote: <blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Compressing a render target and decompressing it in the same single-subpass render pass may waste bandwidth. While this may be beneficial in some circumstances, it does not help in all. v2 (Jason Ekstrand): - Provide a more thorough comment - Enable CCS_D for input attachments Signed-off-by: Nanley Chery <<a href="mailto:nanley.g.chery@intel.com">nanley.g.chery@intel.com</a>> --- src/intel/vulkan/genX_cmd_buffer.c | 17 ++++++++++++++--- 1 file changed, 14 insertions(+), 3 deletions(-) diff --git a/src/intel/vulkan/genX_cmd_buffer.c b/src/intel/vulkan/genX_cmd_buffer.c index 63911f2c8e..cba876b58e 100644 --- a/src/intel/vulkan/genX_cmd_buffer.c +++ b/src/intel/vulkan/genX_cmd_buffer.c @@ -266,13 +266,24 @@ color_attachment_compute_aux_usage(struct anv_device *device, att_state->fast_clear = false; } - if (isl_format_supports_lossless_compression(&device->info, - iview->isl.format)) { + /** + * TODO: Consider using a heuristic to determine if temporarily enabling + * CCS_E for this image view would be beneficial. + * + * While fast-clear resolves and partial resolves are fairly cheap in the + * case where you render to most of the pixels, full resolves are not + * because they potentially involve reading and writing the entire + * framebuffer. If we can't texture with CCS_E, we should leave it off and + * limit ourselves to fast clears. + */ + if (iview->image->aux_usage == ISL_AUX_USAGE_CCS_E) { att_state->aux_usage = ISL_AUX_USAGE_CCS_E; att_state->input_aux_usage = ISL_AUX_USAGE_CCS_E; } else if (att_state->fast_clear) { att_state->aux_usage = ISL_AUX_USAGE_CCS_D; - if (GEN_GEN >= 9) { + if (GEN_GEN >= 9 && + !isl_format_supports_lossless_compression(&device->info, + iview->isl.format)) { /* From the Sky Lake PRM, RENDER_SURFACE_STATE::AuxiliarySurfaceMode: * * "If Number of Multisamples is MULTISAMPLECOUNT_1, AUX_CCS_D <div class="HOEnZb"><div class="h5">-- 2.11.0 _______________________________________________ mesa-dev mailing list <a href="mailto:mesa-dev@lists.freedesktop.org">mesa-dev@lists.freedesktop.org</a> <a href="https://lists.freedesktop.org/mailman/listinfo/mesa-dev" rel="noreferrer" target="_blank">https://lists.freedesktop.org/mailman/listinfo/mesa-dev</a> </div></div></blockquote></div> </div>