From 7fd225c0f1414fb90308c7a8eaf21260ef5a4775 Mon Sep 17 00:00:00 2001
From: Danny Robson <danny@nerdcruft.net>
Date: Thu, 7 Sep 2017 12:52:42 +1000
Subject: [PATCH] hello-tool: automatically build spir shaders

---
 CMakeLists.txt  | 38 ++++++++++++++++++++++++++++++++++++++
 tools/hello.cpp |  4 ++--
 2 files changed, 40 insertions(+), 2 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 89c73f0..0f7a92a 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -11,6 +11,11 @@ find_package (Vulkan REQUIRED)
 find_package (PythonInterp 3 REQUIRED)
 find_package (glfw3 REQUIRED)
 
+find_program (GLSLANG glslangValidator)
+if (NOT GLSLANG)
+    message (FATAL_ERROR "could not locate glslangValidator")
+endif ()
+
 
 ###############################################################################
 include_directories ("${CMAKE_CURRENT_BINARY_DIR}")
@@ -86,6 +91,34 @@ add_library (cruft-vk STATIC ${sources})
 target_link_libraries (cruft-vk cruft-util vulkan)
 
 
+###############################################################################
+list (APPEND shaders
+    tools/hello/shader.vert
+    tools/hello/shader.frag
+)
+
+foreach (src ${shaders})
+    set(src "${CMAKE_CURRENT_SOURCE_DIR}/${src}")
+    get_filename_component(ext ${src} EXT)
+
+    get_filename_component(name ${src} DIRECTORY)
+    get_filename_component(name ${name} NAME)
+
+    set(label "${name}${ext}.spv")
+    set(dst "${CMAKE_CURRENT_BINARY_DIR}/tools/${label}")
+
+    add_custom_command(
+        OUTPUT ${dst}
+        COMMAND ${GLSLANG} -s -o ${dst} -V100 ${src}
+        DEPENDS ${src}
+        COMMENT "[glslang] ${label}"
+        VERBATIM
+    )
+
+    add_custom_target(${label} DEPENDS ${dst})
+endforeach ()
+
+
 ###############################################################################
 get_directory_property (HAS_PARENT PARENT_DIRECTORY)
 if (HAS_PARENT)
@@ -105,6 +138,11 @@ foreach (t info hello)
     target_link_libraries (vk_${t} cruft-vk glfw)
 endforeach ()
 
+
+##-----------------------------------------------------------------------------
+add_dependencies (vk_hello hello.vert.spv hello.frag.spv)
+
+
 ###############################################################################
 configure_file(libcruft-vk-system.pc.in libcruft-vk.pc)
 configure_file(Doxyfile.in Doxyfile)
diff --git a/tools/hello.cpp b/tools/hello.cpp
index b88fef9..93cbb83 100644
--- a/tools/hello.cpp
+++ b/tools/hello.cpp
@@ -288,8 +288,8 @@ main (void)
     auto graphics_queue = ldevice.queue (graphics_queue_id);
     auto present_queue = ldevice.queue (present_queue_id);
 
-    auto vert_module = create_shader (ldevice, "./hello/shader.vert");
-    auto frag_module = create_shader (ldevice, "./hello/shader.frag");
+    auto vert_module = create_shader (ldevice, "./hello.vert.spv");
+    auto frag_module = create_shader (ldevice, "./hello.frag.spv");
 
     VkBufferCreateInfo buffer_info {};
     buffer_info.sType = VK_STRUCTURE_TYPE_BUFFER_CREATE_INFO;