[build][feature] added emcc WASM build-type support

Author: mrsrina

CMakeLists.txt

@@ -28,6 +28,38 @@ set(EKG_VERSION        1.2.0)
 message(STATUS "Building EKG user interface library version ${EKG_VERSION}")
 project(ekg VERSION ${EKG_VERSION} DESCRIPTION "graphical user interface")
 
+set(
+  MATCH_SPECIALIZED_COMPILERS_ID
+  "/emcc"
+)
+
+string(
+  REGEX MATCH
+  ${MATCH_SPECIALIZED_COMPILERS_ID}
+  MATCHED_COMPILER_FILENAME
+  ${CMAKE_CXX_COMPILER}
+)
+
+if(
+  EKG_WASM_LINUX_EMCC_BUILD
+  OR
+  MATCHED_COMPILER_FILENAME STREQUAL "/emcc"
+  )
+  message(STATUS "Found specialized compiler ID: ${MATCHED_COMPILER_FILENAME}, WASM build type")
+  set(EKG_WASM_LINUX_EMCC_BUILD 1)
+elseif(EKG_WASM_LINUX_EMCC_BUILD)
+  message(FATAL_ERROR "No specialized compiler ID was found with '/emcc' for WASM build type")
+endif()
+
+if(
+  CMAKE_CXX_COMPILER_ID STREQUAL "GNU"
+  OR
+  CMAKE_CXX_COMPILER_ID STREQUAL "Clang"
+)
+  message(STATUS "Found compiler ID: ${CMAKE_CXX_COMPILER_ID}")
+  add_compile_options(-O3)
+endif()
+
 # Enable if your base OS is Debian-based (e.g Ubuntu).
 # It is a common issue related by the Linux community.
 if (EKG_LINUX_NOT_FOUND_FREETYPE)
@@ -44,6 +76,9 @@ if(WIN32 OR EKG_FORCE_WINDOWS)
 elseif(ANDROID OR EKG_FORCE_ANDROID)
   set(LIBRARY_OUTPUT_PATH "${ANDROID_ABI}/")
   set(PLATFORM            "${ANDROID_ABI}")
+elseif(LINUX AND EKG_WASM_LINUX_EMCC_BUILD)
+  set(LIBRARY_OUTPUT_PATH "../lib/linux-wasm/")
+  set(PLATFORM            "linux-wasm")
 elseif(LINUX OR EKG_FORCE_LINUX)
   # WSL is not detected as Linux-based OS, same you use a Linux kernel-based distribution.
   set(LIBRARY_OUTPUT_PATH "../lib/linux/")
@@ -53,17 +88,16 @@ endif()
 message(STATUS "Generating EKG ${PLATFORM} native library")
 file(GLOB_RECURSE SOURCE_FILES "src/*.cpp")
 
-if(
-  CMAKE_CXX_COMPILER_ID STREQUAL "GNU"
-  OR
-  CMAKE_CXX_COMPILER_ID STREQUAL "Clang"
-)
-  add_compile_options(-O3)
-endif()
-
 include_directories(./include)
 add_library(ekg STATIC ${SOURCE_FILES})
 
+if (EKG_WASM_LINUX_EMCC_BUILD)
+  set_target_properties(
+    ekg
+    PROPERTIES LINK_FLAGS "--bind -s USE_FREETYPE=1"
+  )
+endif()
+
 message(STATUS "EKG native library building done")
 
 if(LINUX OR EKG_FORCE_LINUX)

devlog/commit.txt

@@ -230,4 +230,5 @@
 -- Added memory-safe method to EKG-tasks and one option to disable that. 
 -- Added an unsafe function `ekg::draw::scissor`/method to explicit display a new scissor placement (position and size).
 -- Solved a visual-glitch where the line always was zero on listbox header(s) and item(s) text-label.
--- Fixed a glitch where dragging and swap was not working out of header(s)-rect boudings.
+-- Fixed a glitch where dragging and swap was not working out of header(s)-rect boudings.
+-- Added WASM build-type compatibility.

ekg-ui-library.sublime-project

@@ -37,5 +37,10 @@
 			"shell_cmd":
 				"cd $folder && cmake -S . -B ./cmake-build/ -G Ninja -DCMAKE_CXX_COMPILER=/usr/bin/clang++ -DCMAKE_EXPORT_COMPILE_COMMANDS=1 -DEKG_LINUX_NOT_FOUND_FREETYPE=1 && cmake --build ./cmake-build/ && cd ./test && cmake -S . -B ./cmake-build -G Ninja -DCMAKE_CXX_COMPILER=/usr/bin/clang++ -DEKG_LINUX_NOT_FOUND_FREETYPE=1 && cmake --build ./cmake-build && cd ./bin && ./ekg-gui-showcase-test"
 		},
+		{
+			"name": "Linux Build WASM",
+			"shell_cmd":
+				"cd $folder && emcmake cmake -S . -B ./cmake-build/ -G Ninja -DEKG_LINUX_NOT_FOUND_FREETYPE=1 -DCMAKE_CXX_COMPILER=/home/rina/emsdk/emsdk/upstream/emscripten/emcc -DCMAKE_EXPORT_COMPILE_COMMANDS=1 && cmake --build ./cmake-build"
+		}
 	],
 }

test/CMakeLists.txt

@@ -1,7 +1,7 @@
 cmake_minimum_required(VERSION 3.10)
 
-message("-- EKG tests enabled")
-message("-- EKG GUI showcase test building")
+message(STATUS "EKG tests enabled")
+message(STATUS "EKG GUI showcase test building")
 
 project(ekg-gui-showcase-test)
 
@@ -21,7 +21,7 @@ else()
   # It is a common issue related by the Linux community.
   if (EKG_LINUX_NOT_FOUND_FREETYPE)
     include_directories(/usr/include/freetype2)
-    message("-- Using var EKG_LINUX_NOT_FOUND_FREETYPE to include `/usr/include/freetype2` directly")
+    message(STATUS "Using var EKG_LINUX_NOT_FOUND_FREETYPE to include `/usr/include/freetype2` directly")
   endif()
 
   set(PLATFORM               "linux")
@@ -32,7 +32,7 @@ include_directories(../include)
 add_executable(ekg-gui-showcase-test "src/ekg_gui_showcase_test.cpp")
 
 file(GLOB LIBRARY_PATH "../lib/${PLATFORM}/libekg.a")
-message("-- EKG GUI test found native library on: ${LIBRARY_PATH}")
+message(STATUS "EKG GUI test found native library on: ${LIBRARY_PATH}")
 
 if (WIN32)
   set(THIRD_PARTY_LIBRARIES mingw32 SDL2main SDL2 opengl32 glew32 freetype)
@@ -47,4 +47,4 @@ target_link_libraries(
   -static-libgcc -static-libstdc++    
 )
 
-message("-- EKG GUI showcase test building done")
+message(STATUS "EKG GUI showcase test building done")