vkd3d: Add config flag to force precise math globally.

Mostly for triaging game issues.
Some invariance issues exist outside just BuiltInPosition.

Signed-off-by: Hans-Kristian Arntzen <post@arntzen-software.no>

Author: HansKristian-Work

include/vkd3d.h

@@ -104,6 +104,7 @@ extern "C" {
 #define VKD3D_CONFIG_FLAG_DISABLE_NV_DGCC (1ull << 46)
 #define VKD3D_CONFIG_FLAG_MEMORY_ALLOCATOR_SKIP_IMAGE_HEAP_CLEAR (1ull << 47)
 #define VKD3D_CONFIG_FLAG_DRIVER_VERSION_SENSITIVE_SHADERS (1ull << 48)
+#define VKD3D_CONFIG_FLAG_FORCE_NOCONTRACTION (1ull << 49)
 
 struct vkd3d_instance;
 

libs/vkd3d/device.c

@@ -839,6 +839,7 @@ static void vkd3d_instance_apply_global_shader_quirks(void)
     static const struct override overrides[] =
     {
         { VKD3D_CONFIG_FLAG_FORCE_NO_INVARIANT_POSITION, VKD3D_SHADER_QUIRK_INVARIANT_POSITION, true },
+        { VKD3D_CONFIG_FLAG_FORCE_NO_CONTRACTION, VKD3D_SHADER_QUIRK_FORCE_NOCONTRACT_MATH, false },
     };
     uint64_t eq_test;
     unsigned int i;
@@ -932,6 +933,7 @@ static const struct vkd3d_debug_option vkd3d_config_options[] =
     {"disable_depth_compression", VKD3D_CONFIG_FLAG_DISABLE_DEPTH_COMPRESSION},
     {"disable_color_compression", VKD3D_CONFIG_FLAG_DISABLE_COLOR_COMPRESSION},
     {"app_debug_marker_only", VKD3D_CONFIG_FLAG_APP_DEBUG_MARKER_ONLY},
+    {"force_nocontraction", VKD3D_CONFIG_FLAG_FORCE_NOCONTRACTION},
 };
 
 static void vkd3d_config_flags_init_once(void)