adding fragdepth propagation, adjusting attachment sizing

src/vulkan/ImageView.zig

@@ -40,3 +40,33 @@ pub fn init(device: *Device, allocator: std.mem.Allocator, info: *const vk.Image
 pub inline fn destroy(self: *Self, allocator: std.mem.Allocator) void {
     self.vtable.destroy(self, allocator);
 }
+
+pub fn levelCount(self: *const Self) u32 {
+    return if (self.subresource_range.level_count == vk.REMAINING_MIP_LEVELS)
+        self.image.mip_levels - self.subresource_range.base_mip_level
+    else
+        self.subresource_range.level_count;
+}
+
+pub fn layerCount(self: *const Self) u32 {
+    return if (self.subresource_range.layer_count == vk.REMAINING_ARRAY_LAYERS)
+        self.remainingLayerCount()
+    else
+        self.subresource_range.layer_count;
+}
+
+pub fn resolvedSubresourceRange(self: *const Self) vk.ImageSubresourceRange {
+    var range = self.subresource_range;
+    range.level_count = self.levelCount();
+    range.layer_count = self.layerCount();
+    return range;
+}
+
+fn remainingLayerCount(self: *const Self) u32 {
+    if (self.image.image_type == .@"3d" and self.image.flags.@"2d_array_compatible_bit") {
+        const depth = @max(@as(u32, 1), self.image.extent.depth >> @intCast(self.subresource_range.base_mip_level));
+        return depth - self.subresource_range.base_array_layer;
+    }
+
+    return self.image.array_layers - self.subresource_range.base_array_layer;
+}