[Mesa-dev] [PATCH 3/3] i965: Re-enable Z16 on Gen8+.

[Kenneth Graunke]

Improves performance in GLBenchmark 2.7 TRex by 3.88889% +/- 0.336383%
(n=80) at 1280x720 on Broadwell GT3.  Together with the previous patch,
it improves performance by 5.42738% +/- 0.541971% (n=10) at 1920x1080.

Note that without the PMA stall fix, this would instead decrease
performance by 22%.

Signed-off-by: Kenneth Graunke <kenneth at whitecape.org>
---
 src/mesa/drivers/dri/i965/brw_surface_formats.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/mesa/drivers/dri/i965/brw_surface_formats.c b/src/mesa/drivers/dri/i965/brw_surface_formats.c
index 5407ef6..ce6f88c 100644
--- a/src/mesa/drivers/dri/i965/brw_surface_formats.c
+++ b/src/mesa/drivers/dri/i965/brw_surface_formats.c
@@ -619,6 +619,8 @@ brw_init_surface_formats(struct brw_context *brw)
    brw->format_supported_as_render_target[MESA_FORMAT_S_UINT8] = true;
    brw->format_supported_as_render_target[MESA_FORMAT_Z_FLOAT32] = true;
    brw->format_supported_as_render_target[MESA_FORMAT_Z32_FLOAT_S8X24_UINT] = true;
+   if (brw->gen >= 8)
+      brw->format_supported_as_render_target[MESA_FORMAT_Z_UNORM16] = true;
 
    /* We remap depth formats to a supported texturing format in
     * translate_tex_format().
@@ -639,6 +641,8 @@ brw_init_surface_formats(struct brw_context *brw)
     * Other speculation is that we may be hitting increased fragment shader
     * execution from GL_LEQUAL/GL_EQUAL depth tests at reduced precision.
     */
+   if (brw->gen >= 8)
+      ctx->TextureFormatSupported[MESA_FORMAT_Z_UNORM16] = true;
 
    /* On hardware that lacks support for ETC1, we map ETC1 to RGBX
     * during glCompressedTexImage2D(). See intel_mipmap_tree::wraps_etc1.
-- 
2.1.2