From 0067f8992002b44bf75f98fae43886c5a6227075 Mon Sep 17 00:00:00 2001
From: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>
Date: Thu, 30 Jul 2020 02:49:33 +0200
Subject: [PATCH] radv: Override the uniform buffer offset alignment for World
 War Z.

Game does the equivalent of a

ALIGN(..., minUniformBufferOffsetAlignment >> 4)

which breaks when said alignment is <16 with a SIGFPE.

CC: <mesa-stable@lists.freedesktop.org>
Reviewed-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6120>
---
 src/amd/vulkan/radv_device.c   | 18 +++++++++++++++++-
 src/util/00-mesa-defaults.conf |  4 ++++
 src/util/driconf.h             |  4 ++++
 3 files changed, 25 insertions(+), 1 deletion(-)

diff --git a/src/amd/vulkan/radv_device.c b/src/amd/vulkan/radv_device.c
index 0f40db2cceb..dda535d5538 100644
--- a/src/amd/vulkan/radv_device.c
+++ b/src/amd/vulkan/radv_device.c
@@ -615,6 +615,7 @@ DRI_CONF_BEGIN
 		DRI_CONF_RADV_REPORT_LLVM9_VERSION_STRING("false")
 		DRI_CONF_RADV_ENABLE_MRT_OUTPUT_NAN_FIXUP("false")
 		DRI_CONF_RADV_NO_DYNAMIC_BOUNDS("false")
+		DRI_CONF_RADV_OVERRIDE_UNIFORM_OFFSET_ALIGNMENT(0)
 	DRI_CONF_SECTION_END
 
 	DRI_CONF_SECTION_DEBUG
@@ -1445,6 +1446,21 @@ radv_max_descriptor_set_size()
 	           64 /* storage image */);
 }
 
+static uint32_t
+radv_uniform_buffer_offset_alignment(const struct radv_physical_device *pdevice)
+{
+	uint32_t uniform_offset_alignment = driQueryOptioni(&pdevice->instance->dri_options,
+	                                                   "radv_override_uniform_offset_alignment");
+	if (!util_is_power_of_two_or_zero(uniform_offset_alignment)) {
+		fprintf(stderr, "ERROR: invalid radv_override_uniform_offset_alignment setting %d:"
+		                "not a power of two\n", uniform_offset_alignment);
+		uniform_offset_alignment = 0;
+	}
+
+	/* Take at least the hardware limit. */
+	return MAX2(uniform_offset_alignment, 4);
+}
+
 void radv_GetPhysicalDeviceProperties(
 	VkPhysicalDevice                            physicalDevice,
 	VkPhysicalDeviceProperties*                 pProperties)
@@ -1527,7 +1543,7 @@ void radv_GetPhysicalDeviceProperties(
 		.viewportSubPixelBits                     = 8,
 		.minMemoryMapAlignment                    = 4096, /* A page */
 		.minTexelBufferOffsetAlignment            = 4,
-		.minUniformBufferOffsetAlignment          = 4,
+		.minUniformBufferOffsetAlignment          = radv_uniform_buffer_offset_alignment(pdevice),
 		.minStorageBufferOffsetAlignment          = 4,
 		.minTexelOffset                           = -32,
 		.maxTexelOffset                           = 31,
diff --git a/src/util/00-mesa-defaults.conf b/src/util/00-mesa-defaults.conf
index 2a1dd8f26fe..5cd65ccf18d 100644
--- a/src/util/00-mesa-defaults.conf
+++ b/src/util/00-mesa-defaults.conf
@@ -733,5 +733,9 @@ TODO: document the other workarounds.
         <application name="Path of Exile (32-bit)" executable="PathOfExile.exe">
             <option name="radv_no_dynamic_bounds" value="true" />
         </application>
+
+	<application name="World War Z" application_name_match="WWZ">
+            <option name="radv_override_uniform_offset_alignment" value="16" />
+        </application>
     </device>
 </driconf>
diff --git a/src/util/driconf.h b/src/util/driconf.h
index c922e94b9f9..d7c734464cc 100644
--- a/src/util/driconf.h
+++ b/src/util/driconf.h
@@ -508,4 +508,8 @@ DRI_CONF_OPT_BEGIN_B(radv_no_dynamic_bounds, def) \
         DRI_CONF_DESC("Disabling bounds checking for dynamic buffer descriptors") \
 DRI_CONF_OPT_END
 
+#define DRI_CONF_RADV_OVERRIDE_UNIFORM_OFFSET_ALIGNMENT(def) \
+DRI_CONF_OPT_BEGIN_V(radv_override_uniform_offset_alignment, int, def, "0:128") \
+        DRI_CONF_DESC("Override the minUniformBufferOffsetAlignment exposed to the application. (0 = default)") \
+DRI_CONF_OPT_END
 #endif
-- 
2.30.2