venus: cap api versions

We do not want to advertise 1.3 when we only support 1.2.

src/venus/vkr_common.h

@@ -34,6 +34,9 @@
 
 #include "vkr_renderer.h"
 
+/* cap instance and device api versions to this */
+#define VKR_MAX_API_VERSION VK_API_VERSION_1_2
+
 #define VKR_DEBUG(category) (unlikely(vkr_debug_flags & VKR_DEBUG_##category))
 
 /* define a type-safe cast function */
@@ -154,6 +157,15 @@ extern uint32_t vkr_debug_flags;
 void
 vkr_log(const char *fmt, ...);
 
+static inline uint32_t
+vkr_api_version_cap_minor(uint32_t version, uint32_t cap)
+{
+   assert(VK_API_VERSION_MAJOR(version) == VK_API_VERSION_MAJOR(cap));
+   if (VK_API_VERSION_MINOR(version) > VK_API_VERSION_MINOR(cap))
+      version = cap - VK_API_VERSION_PATCH(cap) + VK_API_VERSION_PATCH(version);
+   return version;
+}
+
 bool
 object_array_init(struct vkr_context *ctx,
                   struct object_array *arr,

src/venus/vkr_instance.c

@@ -16,7 +16,13 @@ vkr_dispatch_vkEnumerateInstanceVersion(UNUSED struct vn_dispatch_context *dispa
                                         struct vn_command_vkEnumerateInstanceVersion *args)
 {
    vn_replace_vkEnumerateInstanceVersion_args_handle(args);
-   args->ret = vkEnumerateInstanceVersion(args->pApiVersion);
+
+   uint32_t version = 0;
+   args->ret = vkEnumerateInstanceVersion(&version);
+   if (args->ret == VK_SUCCESS)
+      version = vkr_api_version_cap_minor(version, VKR_MAX_API_VERSION);
+
+   *args->pApiVersion = version;
 }
 
 static void

src/venus/vkr_physical_device.c

@@ -219,6 +219,7 @@ vkr_physical_device_init_properties(struct vkr_physical_device *physical_dev)
    vkGetPhysicalDeviceProperties(handle, &physical_dev->properties);
 
    VkPhysicalDeviceProperties *props = &physical_dev->properties;
+   props->apiVersion = vkr_api_version_cap_minor(props->apiVersion, VKR_MAX_API_VERSION);
    props->driverVersion = 0;
 
    /* TODO lie about props->pipelineCacheUUID and patch cache header */