radv: Add EXT_acquire_xlib_display to radv driver [v2]

This extension adds the ability to borrow an X RandR output for
temporary use directly by a Vulkan application to the radv driver.

v2:
	Simplify addition of VK_USE_PLATFORM_XLIB_XRANDR_KHR to
	vulkan_wsi_args

	Suggested-by: Eric Engestrom <eric.engestrom@imgtec.com>

Signed-off-by: Keith Packard <keithp@keithp.com>
Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>

src/amd/vulkan/Makefile.am

@@ -85,7 +85,14 @@ AM_CPPFLAGS += \
 	-DVK_USE_PLATFORM_DISPLAY_KHR
 
 VULKAN_SOURCES += $(VULKAN_WSI_DISPLAY_FILES)
+endif
 
+if HAVE_XLIB_LEASE
+AM_CPPFLAGS += \
+	-DVK_USE_PLATFORM_XLIB_XRANDR_EXT \
+	$(XCB_RANDR_CFLAGS)
+
+VULKAN_LIB_DEPS += $(XCB_RANDR_LIBS)
 endif
 
 if HAVE_PLATFORM_X11

src/amd/vulkan/meson.build

@@ -120,6 +120,11 @@ if with_platform_drm
   libradv_files += files('radv_wsi_display.c')
 endif
 
+if with_xlib_lease
+  radv_deps += dep_xcb_xrandr
+  radv_flags += '-DVK_USE_PLATFORM_XLIB_XRANDR_EXT'
+endif
+
 libvulkan_radeon = shared_library(
   'vulkan_radeon',
   [libradv_files, radv_entrypoints, radv_extensions_c, vk_format_table_c],

src/amd/vulkan/radv_entrypoints_gen.py

@@ -449,7 +449,10 @@ def get_entrypoints_defines(doc):
 
     for extension in doc.findall('./extensions/extension[@platform]'):
         platform = extension.attrib['platform']
-        define = 'VK_USE_PLATFORM_' + platform.upper() + '_KHR'
+        ext = '_KHR'
+        if platform.upper() == 'XLIB_XRANDR':
+            ext = '_EXT'
+        define = 'VK_USE_PLATFORM_' + platform.upper() + ext
 
         for entrypoint in extension.findall('./require/command'):
             fullname = entrypoint.attrib['name']

src/amd/vulkan/radv_extensions.py

@@ -88,6 +88,7 @@ EXTENSIONS = [
     Extension('VK_KHR_multiview',                         1, True),
     Extension('VK_KHR_display',                          23, 'VK_USE_PLATFORM_DISPLAY_KHR'),
     Extension('VK_EXT_direct_mode_display',               1, 'VK_USE_PLATFORM_DISPLAY_KHR'),
+    Extension('VK_EXT_acquire_xlib_display',              1, 'VK_USE_PLATFORM_XLIB_XRANDR_EXT'),
     Extension('VK_EXT_debug_report',                      9, True),
     Extension('VK_EXT_depth_range_unrestricted',          1, True),
     Extension('VK_EXT_descriptor_indexing',               2, True),
@@ -216,12 +217,12 @@ _TEMPLATE_C = Template(COPYRIGHT + """
 #include "vk_util.h"
 
 /* Convert the VK_USE_PLATFORM_* defines to booleans */
-%for platform in ['ANDROID', 'WAYLAND', 'XCB', 'XLIB', 'DISPLAY']:
-#ifdef VK_USE_PLATFORM_${platform}_KHR
-#   undef VK_USE_PLATFORM_${platform}_KHR
-#   define VK_USE_PLATFORM_${platform}_KHR true
+%for platform in ['ANDROID_KHR', 'WAYLAND_KHR', 'XCB_KHR', 'XLIB_KHR', 'DISPLAY_KHR', 'XLIB_XRANDR_EXT']:
+#ifdef VK_USE_PLATFORM_${platform}
+#   undef VK_USE_PLATFORM_${platform}
+#   define VK_USE_PLATFORM_${platform} true
 #else
-#   define VK_USE_PLATFORM_${platform}_KHR false
+#   define VK_USE_PLATFORM_${platform} false
 #endif
 %endfor
 

src/amd/vulkan/radv_wsi_display.c

@@ -164,3 +164,33 @@ radv_ReleaseDisplayEXT(VkPhysicalDevice physical_device,
 				   &pdevice->wsi_device,
 				   display);
 }
+
+#ifdef VK_USE_PLATFORM_XLIB_XRANDR_EXT
+VkResult
+radv_AcquireXlibDisplayEXT(VkPhysicalDevice     physical_device,
+			   Display              *dpy,
+			   VkDisplayKHR         display)
+{
+	RADV_FROM_HANDLE(radv_physical_device, pdevice, physical_device);
+
+	return wsi_acquire_xlib_display(physical_device,
+					&pdevice->wsi_device,
+					dpy,
+					display);
+}
+
+VkResult
+radv_GetRandROutputDisplayEXT(VkPhysicalDevice  physical_device,
+			      Display           *dpy,
+			      RROutput          output,
+			      VkDisplayKHR      *display)
+{
+	RADV_FROM_HANDLE(radv_physical_device, pdevice, physical_device);
+
+	return wsi_get_randr_output_display(physical_device,
+					    &pdevice->wsi_device,
+					    dpy,
+					    output,
+					    display);
+}
+#endif /* VK_USE_PLATFORM_XLIB_XRANDR_EXT */