From 756343271acc7c8bb70722dc857220e40ee54316 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Iv=C3=A1n=20Briano?= <ivan.briano@intel.com>
Date: Tue, 9 Dec 2025 17:22:15 -0800
Subject: [PATCH] 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        |  3 +++
 src/intel/vulkan/anv_physical_device.c | 11 +++++++++--
 src/intel/vulkan/anv_private.h         |  1 +
 src/util/00-mesa-defaults.conf         |  1 +
 src/util/driconf.h                     |  4 ++++
 5 files changed, 18 insertions(+), 2 deletions(-)

diff --git a/src/intel/vulkan/anv_instance.c b/src/intel/vulkan/anv_instance.c
index df07fe4c854..8e59eb379aa 100644
--- a/src/intel/vulkan/anv_instance.c
+++ b/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")) {
diff --git a/src/intel/vulkan/anv_physical_device.c b/src/intel/vulkan/anv_physical_device.c
index d03358414ff..45e053f110a 100644
--- a/src/intel/vulkan/anv_physical_device.c
+++ b/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 */
diff --git a/src/intel/vulkan/anv_private.h b/src/intel/vulkan/anv_private.h
index cd712813ee0..68a90d43c95 100644
--- a/src/intel/vulkan/anv_private.h
+++ b/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.
diff --git a/src/util/00-mesa-defaults.conf b/src/util/00-mesa-defaults.conf
index 614968d57b1..c5eca519f84 100644
--- a/src/util/00-mesa-defaults.conf
+++ b/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" />
diff --git a/src/util/driconf.h b/src/util/driconf.h
index a353839c31c..ca447061760 100644
--- a/src/util/driconf.h
+++ b/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
  */