From: Kenneth Graunke Date: Mon, 21 Jul 2014 23:17:46 +0000 (-0700) Subject: i965/fs: Set LastRT on the final FB write on Broadwell. X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=d4d886a0bc86eb2045b0327fe147eef3c400ffba;p=mesa.git i965/fs: Set LastRT on the final FB write on Broadwell. In Piglit's EXT_framebuffer_multisample/alpha-to-coverage-dual-src-blend test, key->nr_color_regions == 2, but the dual source blend FB write has ir->target set to 0. So we failed to set "Last Render Target Select" on any FB write message. We only emit one FB write per render target, so my comment about setting LastRT on every FB write directed at the last color region is a bit... misinformed. According to the documentation, depth buffer writes and scoreboard updates happen on the FB write with LastRT set, so I believe we want to set it only once. Signed-off-by: Kenneth Graunke Reviewed-by: Matt Turner Cc: "10.2" --- diff --git a/src/mesa/drivers/dri/i965/gen8_fs_generator.cpp b/src/mesa/drivers/dri/i965/gen8_fs_generator.cpp index 2d745fd374f..4f0cf70bf6a 100644 --- a/src/mesa/drivers/dri/i965/gen8_fs_generator.cpp +++ b/src/mesa/drivers/dri/i965/gen8_fs_generator.cpp @@ -116,10 +116,8 @@ gen8_fs_generator::generate_fb_write(fs_inst *ir) uint32_t msg_control = msg_type; - /* "Last Render Target Select" must be set on all writes to the last of - * the render targets (if using MRT), or always for a single RT scenario. - */ - if ((ir->target == key->nr_color_regions - 1) || !key->nr_color_regions) + /* Set "Last Render Target Select" on the final FB write. */ + if (ir->eot) msg_control |= (1 << 4); /* Last Render Target Select */ uint32_t surf_index =