From 9ae285afa791c3a8cba57a493da9603a1ef71a88 Mon Sep 17 00:00:00 2001
From: bjorn <mail@bjornbyt.es>
Date: Sun, 8 May 2022 14:06:18 -0700
Subject: [PATCH] Add glslang;

---
 .gitmodules    |  3 +++
 CMakeLists.txt | 17 ++++++++++++++++-
 Tupfile.lua    | 33 +++++++++++++++++++++++++++++++++
 deps/glslang   |  1 +
 4 files changed, 53 insertions(+), 1 deletion(-)
 create mode 160000 deps/glslang

diff --git a/.gitmodules b/.gitmodules
index 900d4693..49c0b6e6 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -19,3 +19,6 @@
 [submodule "deps/oculus-openxr"]
 	path = deps/oculus-openxr
 	url = https://github.com/lovr-org/ovr_openxr_mobile_sdk
+[submodule "deps/glslang"]
+	path = deps/glslang
+	url = https://github.com/KhronosGroup/glslang
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 94fd1a38..c26ab1ad 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -16,6 +16,7 @@ option(LOVR_ENABLE_THREAD "Enable the thread module" ON)
 option(LOVR_ENABLE_TIMER "Enable the timer module" ON)
 
 option(LOVR_USE_LUAJIT "Use LuaJIT instead of Lua" ON)
+option(LOVR_USE_GLSLANG "Use glslang to compile GLSL shaders" ON)
 option(LOVR_USE_VULKAN "Use the Vulkan renderer" ON)
 option(LOVR_USE_WEBGPU "Use the WebGPU renderer" OFF)
 option(LOVR_USE_OPENXR "Enable the OpenXR backend for the headset module" ON)
@@ -170,6 +171,20 @@ if(LOVR_ENABLE_PHYSICS)
   endif()
 endif()
 
+# glslang
+if(LOVR_USE_GLSLANG)
+  set(ENABLE_HLSL OFF CACHE BOOL "")
+  set(ENABLE_SPVREMAPPER OFF CACHE BOOL "")
+  set(ENABLE_GLSLANG_BINARIES OFF CACHE BOOL "")
+  set(ENABLE_GLSLANG_INSTALL OFF CACHE BOOL "")
+  set(ENABLE_OPT OFF CACHE BOOL "")
+  set(ENABLE_CTEST OFF CACHE BOOL "")
+  set(BUILD_EXTERNAL OFF CACHE BOOL "")
+  add_subdirectory(deps/glslang glslang)
+  set_target_properties(SPIRV PROPERTIES EXCLUDE_FROM_ALL 1)
+  set(LOVR_GLSLANG glslang)
+endif()
+
 # Vulkan
 if(LOVR_USE_VULKAN)
   find_package(Vulkan REQUIRED)
@@ -322,7 +337,6 @@ if(NOT LOVR_BUILD_EXE)
   target_compile_definitions(lovr PUBLIC LOVR_OMIT_MAIN) # specifically for win32 WinMain
 endif()
 
-
 set_target_properties(lovr PROPERTIES C_VISIBILITY_PRESET ${LOVR_SYMBOL_VISIBILITY})
 set_target_properties(lovr PROPERTIES C_STANDARD 11)
 target_include_directories(lovr PRIVATE src src/modules src/lib/stdatomic etc)
@@ -331,6 +345,7 @@ target_link_libraries(lovr
   ${LOVR_LUA}
   ${LOVR_MSDF}
   ${LOVR_ODE}
+  ${LOVR_GLSLANG}
   ${LOVR_OPENXR}
   ${LOVR_OCULUS_AUDIO}
   ${LOVR_PTHREADS}
diff --git a/Tupfile.lua b/Tupfile.lua
index 743c6b90..c8e92603 100644
--- a/Tupfile.lua
+++ b/Tupfile.lua
@@ -6,6 +6,7 @@ config = {
   sanitize = false,
   strict = true,
   luajit = false,
+  glslang = true,
   modules = {
     audio = true,
     data = true,
@@ -241,6 +242,38 @@ if target == 'win32' or target == 'macos' or target == 'linux' then
   tup.rule('.obj/glfw/*.o', '^ LD %o^ $(cc) $(flags) -o %o %f $(glfw_lflags)', lib('glfw'))
 end
 
+if config.modules.graphics and config.glslang then
+  cflags_graphics += '-Ideps/glslang/glslang/Include'
+  cflags_graphics += '-Ideps/glslang/StandAlone'
+  cflags += '-DLOVR_USE_GLSLANG'
+  lflags += '-lglslang'
+
+  glslang_cflags += '-fPIC'
+  glslang_cflags += '-fno-exceptions'
+  glslang_cflags += '-fno-rtti'
+  glslang_cflags += '-Ideps/glslang'
+  glslang_lflags += '-shared'
+  glslang_lflags += '-lstdc++'
+  glslang_src += 'deps/glslang/OGLCompilersDLL/*.cpp'
+  glslang_src += 'deps/glslang/glslang/CInterface/*.cpp'
+  glslang_src += 'deps/glslang/glslang/MachineIndependent/*.cpp'
+  glslang_src += 'deps/glslang/glslang/MachineIndependent/preprocessor/*.cpp'
+  glslang_src += ('deps/glslang/glslang/OSDependent/%s/ossource.cpp'):format(target == 'win32' and 'Windows' or 'Unix')
+  glslang_src += 'deps/glslang/glslang/GenericCodeGen/*.cpp'
+  glslang_src += 'deps/glslang/SPIRV/GlslangToSpv.cpp'
+  glslang_src += 'deps/glslang/SPIRV/Logger.cpp'
+  glslang_src += 'deps/glslang/SPIRV/SpvTools.cpp'
+  glslang_src += 'deps/glslang/SPIRV/SpvBuilder.cpp'
+  glslang_src += 'deps/glslang/SPIRV/SpvPostProcess.cpp'
+  glslang_src += 'deps/glslang/SPIRV/InReadableOrder.cpp'
+  glslang_src += 'deps/glslang/SPIRV/CInterface/spirv_c_interface.cpp'
+  glslang_src += 'deps/glslang/StandAlone/resource_limits_c.cpp'
+  glslang_src += 'deps/glslang/StandAlone/ResourceLimits.cpp'
+
+  tup.foreach_rule(glslang_src, '^ CC glslang/%b^ $(cc) $(flags) $(glslang_cflags) -c %f -o %o', '.obj/glslang/%B.o')
+  tup.rule('.obj/glslang/*.o', '^ LD %o^ $(cxx) $(flags) -o %o %f $(glslang_lflags)', lib('glslang'))
+end
+
 if config.modules.data then
   cflags_rasterizer += '-Ideps/msdfgen'
   lflags += '-lmsdfgen'
diff --git a/deps/glslang b/deps/glslang
new file mode 160000
index 00000000..14f6e273
--- /dev/null
+++ b/deps/glslang
@@ -0,0 +1 @@
+Subproject commit 14f6e2730457bac14a64cb3d962d0a3da8c15ae4