[gtk+] build: Improve vulkan resource handling

[Matthias Clasen <matthiasc src gnome org>]

commit a55b57caffcac21dbce3bc544dac7e1906d108af
Author: Patrick Griffis <tingping tingping se>
Date:   Tue Sep 5 12:47:10 2017 -0400

    build: Improve vulkan resource handling
    
    This fixes the proper dependencies getting set up for generating
    the shaders and only the necessary things getting rebuilt on
    resources changing in gsk.

 gsk/meson.build                  |    8 +++++++-
 gsk/resources/vulkan/meson.build |    8 ++------
 2 files changed, 9 insertions(+), 7 deletions(-)
---
diff --git a/gsk/meson.build b/gsk/meson.build
index 7725171..3c1278f 100644
--- a/gsk/meson.build
+++ b/gsk/meson.build
@@ -45,7 +45,12 @@ gsk_public_headers = files([
 install_headers(gsk_public_headers, 'gsk.h', subdir: 'gtk-4.0/gsk')
 
 gsk_private_vulkan_shaders = []
+# This is an odd split because we use configure_file() below to workaround
+# a limitation in meson preventing using custom_target() with gnome.compile_resources()
+# and that requires file paths, but we also need to have dependencies during development
+# on constantly regenerated files.
 gsk_private_vulkan_compiled_shaders = []
+gsk_private_vulkan_compiled_shaders_deps = []
 
 if have_vulkan
   gsk_private_sources += files([
@@ -96,6 +101,7 @@ gskenum_h = gsk_enums[1]
 
 gskresources = gnome.compile_resources('gskresources',
                                        gsk_resources_xml,
+                                       dependencies: gsk_private_vulkan_compiled_shaders_deps,
                                        source_dir: '.',
                                        c_name: '_gsk',
                                        extra_args: [ '--manual-register', ])
@@ -126,5 +132,5 @@ libgsk = static_library('gsk',
 # list the dependencies and generated headers and such, for use in the
 # "public" libgtk_dep used by internal executables.
 libgsk_dep = declare_dependency(include_directories: [ confinc, ],
-                                sources: [ gskenum_h, gskresources, ],
+                                sources: [ gskenum_h, ],
                                 dependencies: libgdk_dep)
diff --git a/gsk/resources/vulkan/meson.build b/gsk/resources/vulkan/meson.build
index bdca123..b18a298 100644
--- a/gsk/resources/vulkan/meson.build
+++ b/gsk/resources/vulkan/meson.build
@@ -45,7 +45,6 @@ foreach shader: gsk_private_vulkan_shaders
     compiled_shader = custom_target(spv_shader,
                                     input: shader,
                                     output: spv_shader,
-                                    build_by_default: true,
                                     command: [
                                       glslc,
                                       stage_arg,
@@ -56,7 +55,6 @@ foreach shader: gsk_private_vulkan_shaders
     compiled_clip_shader = custom_target(clip_spv_shader,
                                          input: shader,
                                          output: clip_spv_shader,
-                                         build_by_default: true,
                                          command: [
                                            glslc,
                                            stage_arg,
@@ -67,7 +65,6 @@ foreach shader: gsk_private_vulkan_shaders
     compiled_clip_rounded_shader = custom_target(clip_rounded_spv_shader,
                                                  input: shader,
                                                  output: clip_rounded_spv_shader,
-                                                 build_by_default: true,
                                                  command: [
                                                    glslc,
                                                    stage_arg,
@@ -75,8 +72,7 @@ foreach shader: gsk_private_vulkan_shaders
                                                    '@INPUT@',
                                                    '-o', '@OUTPUT@'
                                                  ])
+    gsk_private_vulkan_compiled_shaders_deps += [compiled_shader, compiled_clip_shader, 
compiled_clip_rounded_shader]
   endif
-  gsk_private_vulkan_compiled_shaders += files(spv_shader)
-  gsk_private_vulkan_compiled_shaders += files(clip_spv_shader)
-  gsk_private_vulkan_compiled_shaders += files(clip_rounded_spv_shader)
+  gsk_private_vulkan_compiled_shaders += files(spv_shader, clip_spv_shader, clip_rounded_spv_shader)
 endforeach