anv: add and use a drirc option to enable FullyCovered for vkd3d

Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Tested-by: Caleb Callaway <caleb.callaway@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/38879>

src/intel/vulkan/anv_instance.c

@@ -86,6 +86,7 @@ static const driOptionDescription anv_dri_options[] = {
                      DRI_CONF_ENUM(2048,  "2048 clocks")
                      DRI_CONF_ENUM(4096,  "4096 clocks"))
       DRI_CONF_ANV_UPPER_BOUND_DESCRIPTOR_POOL_SAMPLER(false)
+      DRI_CONF_ANV_ENABLE_FULLY_COVERED(false)
    DRI_CONF_SECTION_END
 
    DRI_CONF_SECTION_DEBUG
@@ -295,6 +296,8 @@ anv_init_dri_options(struct anv_instance *instance)
        driQueryOptionb(&instance->dri_options, "anv_barrier_post_untyped_clear_shader");
     instance->disable_push_constant_alloc =
        driQueryOptionb(&instance->dri_options, "intel_disable_push_constant_alloc");
+    instance->enable_fully_covered =
+       driQueryOptionb(&instance->dri_options, "anv_enable_fully_covered");
 
     if (instance->vk.app_info.engine_name &&
         !strcmp(instance->vk.app_info.engine_name, "DXVK")) {

src/intel/vulkan/anv_physical_device.c

@@ -1701,8 +1701,15 @@ get_properties(const struct anv_physical_device *pdevice,
       props->conservativePointAndLineRasterization = false;
       props->degenerateTrianglesRasterized = true;
       props->degenerateLinesRasterized = false;
-      props->fullyCoveredFragmentShaderInputVariable = false;
-      props->conservativeRasterizationPostDepthCoverage = true;
+
+      bool fully_covered = pdevice->instance->enable_fully_covered &&
+         pdevice->info.verx10 >= 125;
+
+      props->fullyCoveredFragmentShaderInputVariable = fully_covered;
+      /* InnerCoverage, used to implement fully covered, is mutually exclusive
+       * with PostDepthCoverage.
+       */
+      props->conservativeRasterizationPostDepthCoverage = !fully_covered;
    }
 
    /* VK_EXT_custom_border_color */

src/intel/vulkan/anv_private.h

@@ -1774,6 +1774,7 @@ struct anv_instance {
     bool                                        force_guc_low_latency;
     bool                                        emulate_read_without_format;
     bool                                        promote_cbv_to_push_buffers;
+    bool                                        enable_fully_covered;
 
     /**
      * Workarounds for game bugs.

src/util/00-mesa-defaults.conf

@@ -1191,6 +1191,7 @@ TODO: document the other workarounds.
         <!-- We trust vkd3d to not disable compression all the time. -->
         <engine engine_name_match="vkd3d">
             <option name="compression_control_enabled" value="true" />
+	    <option name="anv_enable_fully_covered" value="true" />
         </engine>
         <engine engine_name_match="ANGLE">
             <option name="custom_border_colors_without_format" value="true" />

src/util/driconf.h

@@ -975,6 +975,10 @@
    DRI_CONF_OPT_B(anv_enable_scratch_page, def, \
                   "Disables surface padding and suppresses all page faults, drops writes and returns zeros on reads.")
 
+#define DRI_CONF_ANV_ENABLE_FULLY_COVERED(def) \
+   DRI_CONF_OPT_B(anv_enable_fully_covered, def, \
+                  "Enable fullyCoveredFragmentShaderInputVariable (Alchemist and newer only).")
+
 /**
  * \brief HASVK specific configuration options
  */