From 001c870051359804ec467a1b702f4f26c5f4590d Mon Sep 17 00:00:00 2001
From: syoyo <syoyo@syoyos-MacBook-Air.local>
Date: Fri, 18 Dec 2020 01:09:44 +0900
Subject: [PATCH] Make cmake script `add_subdirectory` friendly.

---
 CMakeLists.txt | 58 ++++++++++++++++++++++++++++++++++++++------------
 tiny_gltf.cc   |  4 ++++
 2 files changed, 48 insertions(+), 14 deletions(-)
 create mode 100644 tiny_gltf.cc

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 30cc854..fea36aa 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -4,9 +4,11 @@ PROJECT (tinygltf)
 
 SET(CMAKE_CXX_STANDARD 11)
 
-option(TINYGLTF_BUILD_LOADER_EXAMPLE "Build loader_example" ON)
+option(TINYGLTF_BUILD_LOADER_EXAMPLE "Build loader_example(load glTF and dump infos)" ON)
 option(TINYGLTF_BUILD_GL_EXAMPLES "Build GL exampels(requires glfw, OpenGL, etc)" OFF)
 option(TINYGLTF_BUILD_VALIDATOR_EXAMPLE "Build validator exampe" OFF)
+option(TINYGLTF_HEADER_ONLY "On: header-only mode. Off: create tinygltf library(No TINYGLTF_IMPLEMENTATION required in your project)" OFF)
+option(TINYGLTF_INSTALL "Install tinygltf files during install step. Usually set to OFF if you include tinygltf through add_subdirectory()" ON)
 
 if (TINYGLTF_BUILD_LOADER_EXAMPLE)
   ADD_EXECUTABLE ( loader_example
@@ -22,20 +24,48 @@ endif (TINYGLTF_BUILD_GL_EXAMPLES)
 if (TINYGLTF_BUILD_VALIDATOR_EXAMPLE)
   ADD_SUBDIRECTORY ( examples/validator )
 endif (TINYGLTF_BUILD_VALIDATOR_EXAMPLE)
+
 #
-# TinuGLTF is a header-only library, so no library build. just install header files.
+# for add_subdirectory and standalone build
 #
-INSTALL ( FILES
-  json.hpp
-  stb_image.h
-  stb_image_write.h
-  tiny_gltf.h
-  DESTINATION
-  include
+if (TINYGLTF_HEADER_ONLY)
+  add_library(tinygltf INTERFACE)
+  
+  target_include_directories(tinygltf
+          INTERFACE
+          $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}>
+          $<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}>
   )
 
-INSTALL ( FILES
-  cmake/TinyGLTFConfig.cmake
-  DESTINATION
-  cmake
-  )
+else (TINYGLTF_HEADER_ONLY)
+  add_library(tinygltf)
+  target_sources(tinygltf PRIVATE
+          ${CMAKE_CURRENT_SOURCE_DIR}/tiny_gltf.cc)
+  target_include_directories(tinygltf
+          INTERFACE
+          $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}>
+          $<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}>
+          )
+endif (TINYGLTF_HEADER_ONLY)
+
+if (TINYGLTF_INSTALL)
+
+  # Do not install .lib even if !TINYGLTF_HEADER_ONLY
+
+  INSTALL ( FILES
+    json.hpp
+    stb_image.h
+    stb_image_write.h
+    tiny_gltf.h
+    ${TINYGLTF_EXTRA_SOUECES}
+    DESTINATION
+    include
+    )
+  
+  INSTALL ( FILES
+    cmake/TinyGLTFConfig.cmake
+    DESTINATION
+    cmake
+    )
+
+endif(TINYGLTF_INSTALL)
diff --git a/tiny_gltf.cc b/tiny_gltf.cc
new file mode 100644
index 0000000..3f27915
--- /dev/null
+++ b/tiny_gltf.cc
@@ -0,0 +1,4 @@
+#define TINYGLTF_IMPLEMENTATION
+#define STB_IMAGE_IMPLEMENTATION
+#define STB_IMAGE_WRITE_IMPLEMENTATION
+#include "tiny_gltf.h"