tu/lrz: Add tu_ignore_frag_depth_direction driconf

Will be useful if app doesn't specify depth direction correctly.
E.g. the capture of "Sons of The Forest" I have has a shader
where `gl_FragDepth` has `layout(depth_less)`, but the output for different
fragments is actually sometimes less, sometimes more than the original depth
by a tiny margin.

Signed-off-by: Danylo Piliaiev <dpiliaiev@igalia.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/34423>

src/freedreno/vulkan/tu_device.cc

@@ -1643,6 +1643,7 @@ static const driOptionDescription tu_dri_options[] = {
       DRI_CONF_TU_ALLOW_OOB_INDIRECT_UBO_LOADS(false)
       DRI_CONF_TU_DISABLE_D24S8_BORDER_COLOR_WORKAROUND(false)
       DRI_CONF_TU_USE_TEX_COORD_ROUND_NEAREST_EVEN_MODE(false)
+      DRI_CONF_TU_IGNORE_FRAG_DEPTH_DIRECTION(false)
    DRI_CONF_SECTION_END
 };
 
@@ -1667,6 +1668,8 @@ tu_init_dri_options(struct tu_instance *instance)
          driQueryOptionb(&instance->dri_options, "tu_disable_d24s8_border_color_workaround");
    instance->use_tex_coord_round_nearest_even_mode =
          driQueryOptionb(&instance->dri_options, "tu_use_tex_coord_round_nearest_even_mode");
+   instance->ignore_frag_depth_direction =
+         driQueryOptionb(&instance->dri_options, "tu_ignore_frag_depth_direction");
 }
 
 static uint32_t instance_count = 0;

src/freedreno/vulkan/tu_device.h

@@ -208,6 +208,9 @@ struct tu_instance
 
    /* D3D emulation requires texture coordinates to be rounded to nearest even value. */
    bool use_tex_coord_round_nearest_even_mode;
+
+   /* Apps may be accidentally incorrect  */
+   bool ignore_frag_depth_direction;
 };
 VK_DEFINE_HANDLE_CASTS(tu_instance, vk.base, VkInstance,
                        VK_OBJECT_TYPE_INSTANCE)

src/freedreno/vulkan/tu_lrz.cc

@@ -815,7 +815,8 @@ tu6_calculate_lrz_state(struct tu_cmd_buffer *cmd,
     * enable late Z test.
     */
    if (!disable_lrz_due_to_fs && fs->variant->writes_pos &&
-       !fs->variant->fs.early_fragment_tests) {
+       !fs->variant->fs.early_fragment_tests &&
+       !cmd->device->instance->ignore_frag_depth_direction) {
       if (fs->variant->fs.depth_layout == FRAG_DEPTH_LAYOUT_NONE ||
           fs->variant->fs.depth_layout == FRAG_DEPTH_LAYOUT_ANY) {
          disable_lrz_due_to_fs = true;

src/util/00-mesa-defaults.conf

@@ -1262,6 +1262,9 @@ TODO: document the other workarounds.
             -->
             <option name="tu_use_tex_coord_round_nearest_even_mode" value="true" />
         </engine>
+        <application name="Sons Of The Forest" executable="SonsOfTheForest.exe">
+            <option name="tu_ignore_frag_depth_direction" value="true" />
+        </application>
     </device>
 
     <device driver="hk">

src/util/driconf.h

@@ -676,6 +676,10 @@
    DRI_CONF_OPT_B(tu_use_tex_coord_round_nearest_even_mode, def, \
                   "Use D3D-compliant round-to-nearest-even mode for texture coordinates")
 
+#define DRI_CONF_TU_IGNORE_FRAG_DEPTH_DIRECTION(def) \
+   DRI_CONF_OPT_B(tu_ignore_frag_depth_direction, def, \
+                  "Ignore direction specified for gl_FragDepth output")
+
 /**
  * \brief Honeykrisp specific configuration options
  */