Add HLSL support through DXC (#511)

This Cl adds DXC to the Amber third_party directory and enables using
HLSL as the shader language in AmberScript.

Fixes #34 

1 files changed, 26 insertions, 6 deletions

diff --git a/CMakeLists.txt b/CMakeLists.txt
index c8042b7..10864c1 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -44,7 +44,8 @@ option(AMBER_SKIP_SAMPLES
 option(AMBER_USE_LOCAL_VULKAN "Build with vulkan in third_party" OFF)
 option(AMBER_ENABLE_SWIFTSHADER
   "Build using SwiftShader" ${AMBER_ENABLE_SWIFTSHADER})
-option(AMBER_USE_LOCAL_VULKAN "Build with vulkan in third_party" OFF)
+option(AMBER_USE_DXC "Enable DXC integration" ${AMBER_USE_DXC})
+
 if(WIN32)
   # On Windows, CMake by default compiles with the shared CRT.
   # Default it to the static CRT.
@@ -53,7 +54,6 @@ if(WIN32)
 	 ${AMBER_ENABLE_SHARED_CRT})
 endif(WIN32)
 
-
 if (${AMBER_SKIP_SPIRV_TOOLS})
   set(AMBER_ENABLE_SPIRV_TOOLS FALSE)
   set(AMBER_ENABLE_SHADERC FALSE)
@@ -66,11 +66,13 @@ else()
     set(AMBER_ENABLE_SHADERC TRUE)
   endif()
 endif()
+
 if (${AMBER_SKIP_TESTS})
   set(AMBER_ENABLE_TESTS FALSE)
 else()
   set(AMBER_ENABLE_TESTS TRUE)
 endif()
+
 if (${AMBER_SKIP_SAMPLES})
   set(AMBER_ENABLE_SAMPLES FALSE)
 else()
@@ -82,17 +84,21 @@ if (${AMBER_ENABLE_SWIFTSHADER})
   set(AMBER_USE_LOCAL_VULKAN TRUE)
 endif()
 
-if (${AMBER_USE_LOCAL_VULKAN})
-  message(STATUS "Using python3")
-  # vulkan-loaders requires python 3
-  find_package(PythonInterp 3 REQUIRED)
+if (${AMBER_USE_DXC})
+  set(AMBER_ENABLE_DXC TRUE)
+else()
+  set(AMBER_ENABLE_DXC FALSE)
 endif()
 
+message(STATUS "Using python3")
+find_package(PythonInterp 3 REQUIRED)
+
 message(STATUS "Amber enable SPIRV-Tools: ${AMBER_ENABLE_SPIRV_TOOLS}")
 message(STATUS "Amber enable Shaderc: ${AMBER_ENABLE_SHADERC}")
 message(STATUS "Amber enable tests: ${AMBER_ENABLE_TESTS}")
 message(STATUS "Amber enable samples: ${AMBER_ENABLE_SAMPLES}")
 message(STATUS "Amber enable SwiftShader: ${AMBER_ENABLE_SWIFTSHADER}")
+message(STATUS "Amber enable DXC: ${AMBER_ENABLE_DXC}")
 
 include_directories("${PROJECT_SOURCE_DIR}/include")
 include_directories("${PROJECT_SOURCE_DIR}")
@@ -112,6 +118,20 @@ add_definitions(-DAMBER_ENGINE_VULKAN=$<BOOL:${Vulkan_FOUND}>)
 add_definitions(-DAMBER_ENGINE_DAWN=$<BOOL:${Dawn_FOUND}>)
 add_definitions(-DAMBER_ENABLE_SPIRV_TOOLS=$<BOOL:${AMBER_ENABLE_SPIRV_TOOLS}>)
 add_definitions(-DAMBER_ENABLE_SHADERC=$<BOOL:${AMBER_ENABLE_SHADERC}>)
+add_definitions(-DAMBER_ENABLE_DXC=$<BOOL:${AMBER_ENABLE_DXC}>)
+
+set(CMAKE_DEBUG_POSTFIX "")
+
+# This has to be done very early so the link path will get set correctly for all
+# the various libraries and binaries.
+if (${AMBER_ENABLE_DXC})
+  link_directories("${CMAKE_BINARY_DIR}/third_party/dxc/lib")
+
+  if (MSVC)
+    # DXC turns this off all over the place so we have to do the same.
+    add_definitions(/D_ITERATOR_DEBUG_LEVEL=0)
+  endif()
+endif()
 
 if ("${CMAKE_BUILD_TYPE}" STREQUAL "")
   message(STATUS "No build type selected, default to Debug")