Discard most external STB*_IMPLEMENTATION inputs and generate a libra…

…ry using Hunter

CMakeLists.txt

@@ -1,18 +1,26 @@
-# Copyright (c) 2017, Ruslan Baratov
+# Copyright (c) 2017-2021, Ruslan Baratov, Rahul Sheth
 # All rights reserved.
 
 cmake_minimum_required(VERSION 3.2)
 project(stb VERSION 0.0.1)
 
-add_library(stb INTERFACE)
+set(STBCC_GRID_COUNT_X_LOG2 "10" CACHE STRING "STBCC_GRID_COUNT_X_LOG2")
+set(STBCC_GRID_COUNT_Y_LOG2 "10" CACHE STRING "STBCC_GRID_COUNT_Y_LOG2")
+
+set(STBDIV_C_INTEGER_DIVISION_TRUNCATES OFF CACHE BOOL "C_INTEGER_DIVISION_TRUNCATES")
+set(STBDIV_C_INTEGER_DIVISION_FLOORS OFF CACHE BOOL "C_INTEGER_DIVISION_FLOORS")
+
+set(STBVOX_CONFIG_MODE "0" CACHE STRING "STBVOX_CONFIG_MODE")
+set(STBVOX_CONFIG_PREFER_TEXBUFFER OFF CACHE BOOL "STBVOX_CONFIG_PREFER_TEXBUFFER")
+
+add_library(stb STATIC)
 
 # Installation (https://github.com/forexample/package-example) {
 
 set(config_install_dir "lib/cmake/${PROJECT_NAME}")
 set(include_install_dir "include")
 
 set(generated_dir "${CMAKE_CURRENT_BINARY_DIR}/generated")
-
 set(version_config "${generated_dir}/${PROJECT_NAME}ConfigVersion.cmake")
 set(project_config "${generated_dir}/${PROJECT_NAME}Config.cmake")
 set(TARGETS_EXPORT_NAME "${PROJECT_NAME}Targets")
@@ -34,37 +42,76 @@ configure_package_config_file(
     INSTALL_DESTINATION "${config_install_dir}"
 )
 
+function(GenerateHeader header_name defines)
+    file(READ "${header_name}" HEADER_STRING)
+    get_filename_component(header_prefix ${header_name} NAME_WE)
+    set(GENERATED_HEADER "${generated_dir}/${header_prefix}.h")
+    set(HEADER_DEFS "")
+    set(HEADER_UNDEFS "")
+    foreach(define IN LISTS defines)
+        string(APPEND HEADER_DEFS "#define ${define}\n")
+        string(REGEX REPLACE "(.*)\ .*" "\\1" undefine "${define}")
+        string(APPEND HEADER_UNDEFS "#undef ${undefine}\n")
+    endforeach()
+    configure_file("${CMAKE_CURRENT_SOURCE_DIR}/cmake/header.template.in" "${GENERATED_HEADER}")
+    install(FILES "${GENERATED_HEADER}" DESTINATION "${include_install_dir}/${PROJECT_NAME}")
+
+    list(LENGTH defines define_count)
+    if(define_count GREATER 0)
+        string(PREPEND HEADER_STRING "${HEADER_DEFS}")
+        file(WRITE "${generated_dir}/${header_prefix}.c" "${HEADER_STRING}")
+        target_sources(stb PRIVATE "${generated_dir}/${header_prefix}.c")
+    endif()
+endfunction()
+
+GenerateHeader(stb.h "STB_DEFINE")
+GenerateHeader(stb_c_lexer.h "STB_C_LEXER_IMPLEMENTATION")
+GenerateHeader(stb_connected_components.h "STBCC_GRID_COUNT_X_LOG2 ${STBCC_GRID_COUNT_X_LOG2};STBCC_GRID_COUNT_Y_LOG2 ${STBCC_GRID_COUNT_Y_LOG2};STB_CONNECTED_COMPONENTS_IMPLEMENTATION")
+set(STB_DIVIDE_DEFINES "STB_DIVIDE_IMPLEMENTATION")
+if(STBDIV_C_INTEGER_DIVISION_TRUNCATES)
+  list(APPEND STB_DIVIDE_DEFINES "C_INTEGER_DIVISION_TRUNCATES")
+  target_compile_definitions(stb PUBLIC "C_INTEGER_DIVISION_TRUNCATES")
+endif()
+if(STBDIV_C_INTEGER_DIVISION_FLOORS)
+  list(APPEND STB_DIVIDE_DEFINES "C_INTEGER_DIVISION_FLOORS")
+  target_compile_definitions(stb PUBLIC "C_INTEGER_DIVISION_FLOORS")
+endif()
+GenerateHeader(stb_divide.h "${STB_DIVIDE_DEFINES}")
+GenerateHeader(stb_ds.h "STB_DS_IMPLEMENTATION")
+GenerateHeader(stb_dxt.h "STB_DXT_IMPLEMENTATION")
+GenerateHeader(stb_easy_font.h "")
+GenerateHeader(stb_herringbone_wang_tile.h "STB_HERRINGBONE_WANG_TILE_IMPLEMENTATION")
+GenerateHeader(stb_hexwave.h "STB_HEXWAVE_IMPLEMENTATION")
+GenerateHeader(stb_image.h "STB_IMAGE_IMPLEMENTATION")
+GenerateHeader(stb_image_resize.h "STB_IMAGE_RESIZE_IMPLEMENTATION")
+GenerateHeader(stb_image_write.h "STB_IMAGE_WRITE_IMPLEMENTATION")
+GenerateHeader(stb_include.h "STB_INCLUDE_IMPLEMENTATION")
+GenerateHeader(stb_leakcheck.h "STB_LEAKCHECK_IMPLEMENTATION")
+GenerateHeader(stb_perlin.h "STB_PERLIN_IMPLEMENTATION")
+GenerateHeader(stb_rect_pack.h "")
+GenerateHeader(stb_sprintf.h "")
+# stb_textedit has way too many configurable options, bypass implementation generation for now.
+install(FILES stb_textedit.h DESTINATION "${include_install_dir}/${PROJECT_NAME}")
+# stb_tilemap_editor requires functions to be defined
+install(FILES stb_tilemap_editor.h DESTINATION "${include_install_dir}/${PROJECT_NAME}")
+GenerateHeader(stb_truetype.h "STB_TRUETYPE_IMPLEMENTATION")
+GenerateHeader(stb_vorbis.h "")
+
+set(STBVOX_DEFINES "STB_VOXEL_RENDER_IMPLEMENTATION;STBVOX_CONFIG_MODE ${STBVOX_CONFIG_MODE}")
+if(STBVOX_CONFIG_PREFER_TEXBUFFER)
+  list(APPEND STBVOX_DEFINES "STBVOX_CONFIG_PREFER_TEXBUFFER")
+  target_compile_definitions(stb PUBLIC "STBVOX_CONFIG_PREFER_TEXBUFFER")
+endif()
+GenerateHeader(stb_voxel_render.h "${STBVOX_DEFINES}")
+
+target_compile_definitions(stb PUBLIC STB_USE_HUNTER)
+
 install(
     TARGETS stb
     EXPORT "${TARGETS_EXPORT_NAME}"
     INCLUDES DESTINATION "${include_install_dir}"
 )
 
-install(
-    FILES
-    stb_c_lexer.h
-    stb_connected_components.h
-    stb_divide.h
-    stb_dxt.h
-    stb_easy_font.h
-    stb.h
-    stb_herringbone_wang_tile.h
-    stb_image.h
-    stb_image_resize.h
-    stb_image_write.h
-    stb_leakcheck.h
-    stb_perlin.h
-    stb_rect_pack.h
-    stb_sprintf.h
-    stb_textedit.h
-    stb_tilemap_editor.h
-    stb_truetype.h
-    stb_vorbis.h
-    stb_voxel_render.h
-    stretchy_buffer.h
-    DESTINATION "${include_install_dir}/${PROJECT_NAME}"
-)
-
 install(
     FILES "${project_config}" "${version_config}"
     DESTINATION "${config_install_dir}"

cmake/header.template.in

@@ -0,0 +1,5 @@
+#ifdef STB_USE_HUNTER
+@HEADER_UNDEFS@
+#endif
+
+@HEADER_STRING@