anv: Add helpers to provide simple VkFormat introspection

As much as I hate adding yet more format introspection, there are times
when the VkFormat is sufficient and we don't want to round-trip through
isl_format.  For these times, the new vk_format_info.c/h files provide some
simple driver-agnostic VkFormat introspection.  This intended to be
specific to Vulkan but not to any driver whatsoever.

src/intel/vulkan/Makefile.sources

@@ -49,7 +49,8 @@ VULKAN_FILES := \
 	anv_util.c \
 	anv_wsi.c \
 	anv_wsi.h \
-	genX_pipeline_util.h
+	genX_pipeline_util.h \
+	vk_format_info.h
 
 VULKAN_WSI_WAYLAND_FILES := \
 	anv_wsi_wayland.c

src/intel/vulkan/vk_format_info.h

@@ -0,0 +1,65 @@
+/*
+ * Copyright © 2016 Intel Corporation
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+
+#pragma once
+
+#include <stdbool.h>
+#include <vulkan/vulkan.h>
+
+static inline VkImageAspectFlags
+vk_format_aspects(VkFormat format)
+{
+   switch (format) {
+   case VK_FORMAT_UNDEFINED:
+      return 0;
+
+   case VK_FORMAT_S8_UINT:
+      return VK_IMAGE_ASPECT_STENCIL_BIT;
+
+   case VK_FORMAT_D16_UNORM_S8_UINT:
+   case VK_FORMAT_D24_UNORM_S8_UINT:
+   case VK_FORMAT_D32_SFLOAT_S8_UINT:
+      return VK_IMAGE_ASPECT_DEPTH_BIT | VK_IMAGE_ASPECT_STENCIL_BIT;
+
+   case VK_FORMAT_D16_UNORM:
+   case VK_FORMAT_X8_D24_UNORM_PACK32:
+   case VK_FORMAT_D32_SFLOAT:
+      return VK_IMAGE_ASPECT_DEPTH_BIT;
+
+   default:
+      return VK_IMAGE_ASPECT_COLOR_BIT;
+   }
+}
+
+static inline bool
+vk_format_is_color(VkFormat format)
+{
+   return vk_format_aspects(format) == VK_IMAGE_ASPECT_COLOR_BIT;
+}
+
+static inline bool
+vk_format_is_depth_or_stencil(VkFormat format)
+{
+   const VkImageAspectFlags aspects = vk_format_aspects(format);
+   return aspects & (VK_IMAGE_ASPECT_DEPTH_BIT | VK_IMAGE_ASPECT_STENCIL_BIT);
+}