Mesa (master): ilo: fix and enable fast depth clear

[Chia-I Wu]

Module: Mesa
Branch: master
Commit: d5cbd73d210d73b39c1b94f58c203053be2e4128
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=d5cbd73d210d73b39c1b94f58c203053be2e4128

Author: Chia-I Wu <olvaffe at gmail.com>
Date:   Thu Jan 16 15:29:03 2014 +0800

ilo: fix and enable fast depth clear

Use tex->bo_format instead of zs->format in ilo_blitter_rectlist_clear_zs()
because the latter may be combined depth/stencil format.  hiz_can_clear_zs()
is no-op for GEN7+, but move the GEN check so that the assertions are tested.

Finally, call the fast depth clear function from ilo_clear().

---

 src/gallium/drivers/ilo/ilo_blit.c             |    9 ++++++
 src/gallium/drivers/ilo/ilo_blitter_rectlist.c |   38 ++++++++++++++++++------
 2 files changed, 38 insertions(+), 9 deletions(-)

diff --git a/src/gallium/drivers/ilo/ilo_blit.c b/src/gallium/drivers/ilo/ilo_blit.c
index ad304c7..f0e9412 100644
--- a/src/gallium/drivers/ilo/ilo_blit.c
+++ b/src/gallium/drivers/ilo/ilo_blit.c
@@ -65,6 +65,15 @@ ilo_clear(struct pipe_context *pipe,
 {
    struct ilo_context *ilo = ilo_context(pipe);
 
+   if ((buffers & PIPE_CLEAR_DEPTHSTENCIL) && ilo->fb.state.zsbuf) {
+      if (ilo_blitter_rectlist_clear_zs(ilo->blitter, ilo->fb.state.zsbuf,
+               buffers & PIPE_CLEAR_DEPTHSTENCIL, depth, stencil))
+         buffers &= ~PIPE_CLEAR_DEPTHSTENCIL;
+
+      if (!buffers)
+         return;
+   }
+
    ilo_blitter_pipe_clear_fb(ilo->blitter, buffers, color, depth, stencil);
 }
 
diff --git a/src/gallium/drivers/ilo/ilo_blitter_rectlist.c b/src/gallium/drivers/ilo/ilo_blitter_rectlist.c
index 534764f..3df985e 100644
--- a/src/gallium/drivers/ilo/ilo_blitter_rectlist.c
+++ b/src/gallium/drivers/ilo/ilo_blitter_rectlist.c
@@ -31,6 +31,7 @@
 #include "ilo_blitter.h"
 #include "ilo_3d.h"
 #include "ilo_3d_pipeline.h"
+#include "ilo_blit.h"
 #include "ilo_gpe.h"
 #include "ilo_gpe_gen6.h" /* for ve_init_cso_with_components and
                              zs_align_surface */
@@ -342,13 +343,10 @@ static bool
 hiz_can_clear_zs(const struct ilo_blitter *blitter,
                  const struct ilo_texture *tex)
 {
-   if (blitter->ilo->dev->gen > ILO_GEN(6))
-      return true;
-
    /*
     * From the Sandy Bridge PRM, volume 2 part 1, page 314:
     *
-    *      Several cases exist where Depth Buffer Clear cannot be enabled (the
+    *     "Several cases exist where Depth Buffer Clear cannot be enabled (the
     *      legacy method of clearing must be performed):
     *
     *      - If the depth buffer format is D32_FLOAT_S8X24_UINT or
@@ -361,11 +359,25 @@ hiz_can_clear_zs(const struct ilo_blitter *blitter,
     *
     *      - [DevSNB{W/A}]: When depth buffer format is D16_UNORM and the
     *        width of the map (LOD0) is not multiple of 16, fast clear
-    *        optimization must be disabled.
+    *        optimization must be disabled."
+    *
+    * From the Ivy Bridge PRM, volume 2 part 1, page 313:
+    *
+    *     "Several cases exist where Depth Buffer Clear cannot be enabled (the
+    *      legacy method of clearing must be performed):
+    *
+    *      - If the depth buffer format is D32_FLOAT_S8X24_UINT or
+    *        D24_UNORM_S8_UINT.
+    *
+    *      - If stencil test is enabled but the separate stencil buffer is
+    *        disabled."
+    *
+    * The truth is when HiZ is enabled, separate stencil is also enabled on
+    * all GENs.  The depth buffer format cannot be combined depth/stencil.
     */
    switch (tex->bo_format) {
    case PIPE_FORMAT_Z16_UNORM:
-      if (tex->base.width0 % 16)
+      if (blitter->ilo->dev->gen == ILO_GEN(6) && tex->base.width0 % 16)
          return false;
       break;
    case PIPE_FORMAT_Z24_UNORM_S8_UINT:
@@ -388,7 +400,7 @@ ilo_blitter_rectlist_clear_zs(struct ilo_blitter *blitter,
 {
    struct ilo_texture *tex = ilo_texture(zs->texture);
    struct pipe_depth_stencil_alpha_state dsa_state;
-   uint32_t uses;
+   uint32_t uses, clear_value;
 
    if (!ilo_texture_can_enable_hiz(tex,
             zs->u.tex.level, zs->u.tex.first_layer,
@@ -398,6 +410,15 @@ ilo_blitter_rectlist_clear_zs(struct ilo_blitter *blitter,
    if (!hiz_can_clear_zs(blitter, tex))
       return false;
 
+   clear_value = util_pack_z(tex->bo_format, depth);
+
+   ilo_blit_resolve_surface(blitter->ilo, zs,
+         ILO_TEXTURE_RENDER_WRITE | ILO_TEXTURE_CLEAR);
+   ilo_texture_set_slice_clear_value(tex, zs->u.tex.level,
+         zs->u.tex.first_layer,
+         zs->u.tex.last_layer - zs->u.tex.first_layer + 1,
+         clear_value);
+
    /*
     * From the Sandy Bridge PRM, volume 2 part 1, page 313-314:
     *
@@ -449,8 +470,7 @@ ilo_blitter_rectlist_clear_zs(struct ilo_blitter *blitter,
    ilo_blitter_set_op(blitter, ILO_BLITTER_RECTLIST_CLEAR_ZS);
 
    ilo_blitter_set_dsa(blitter, &dsa_state);
-   ilo_blitter_set_clear_values(blitter,
-         util_pack_z(zs->format, depth), (ubyte) stencil);
+   ilo_blitter_set_clear_values(blitter, clear_value, (ubyte) stencil);
    ilo_blitter_set_fb_from_surface(blitter, zs);
 
    uses = ILO_BLITTER_USE_DSA;