anv/entrypoints: Run the headers through the preprocessor first

This allows us to filter based on preprocessor directives.  We could build
a partial preprocessor into the generator, but we would likely get it
wrong.  This allows us to filter out, for instance, windows-specific WSI
stuff.

src/vulkan/Makefile.am

@@ -30,6 +30,12 @@ vulkan_include_HEADERS =				\
 	$(top_srcdir)/include/vulkan/vk_ext_khr_swapchain.h	\
 	$(top_srcdir)/include/vulkan/vk_ext_khr_device_swapchain.h
 
+# Used when generating entrypoints to filter out unwanted extensions
+VULKAN_ENTRYPOINT_CPPFLAGS = \
+   -I$(top_srcdir)/include/vulkan \
+   -DVK_USE_PLATFORM_XCB_KHR \
+   -DVK_USE_PLATFORM_WAYLAND_KHR
+
 lib_LTLIBRARIES = libvulkan.la
 
 check_LTLIBRARIES = libvulkan-test.la
@@ -146,10 +152,10 @@ libvulkan_la_SOURCES =                                  \
 	anv_gem.c
 
 anv_entrypoints.h : anv_entrypoints_gen.py $(vulkan_include_HEADERS)
-	$(AM_V_GEN)cat $(vulkan_include_HEADERS) | $(PYTHON2) $< header > $@
+	$(AM_V_GEN) cat $(vulkan_include_HEADERS) | $(CPP) $(VULKAN_ENTRYPOINT_CPPFLAGS) - | $(PYTHON2) $< header > $@
 
 anv_entrypoints.c : anv_entrypoints_gen.py $(vulkan_include_HEADERS)
-	$(AM_V_GEN)cat $(vulkan_include_HEADERS) | $(PYTHON2) $< code > $@
+	$(AM_V_GEN) cat $(vulkan_include_HEADERS) | $(CPP) $(VULKAN_ENTRYPOINT_CPPFLAGS) - | $(PYTHON2) $< code > $@
 
 isl_format_layout.c: isl_format_layout_gen.bash \
                      isl_format_layout.csv

src/vulkan/anv_entrypoints_gen.py

@@ -27,7 +27,7 @@ import fileinput, re, sys
 # Each function typedef in the vulkan.h header is all on one line and matches
 # this regepx. We hope that won't change.
 
-p = re.compile('typedef ([^ ]*) *\(VKAPI_PTR \*PFN_vk([^(]*)\)(.*);')
+p = re.compile('typedef ([^ ]*) *\((?:VKAPI_PTR)? *\*PFN_vk([^(]*)\)(.*);')
 
 entrypoints = []