afegit suport Emscripten/WebAssembly al build system (milestone 4)

- createSystemFolder() adaptat per Emscripten (MEMFS, sense pwd.h/unistd.h)
- initOptions() amb windowSize=1 i videoMode=0 per Emscripten
- CMakeLists.txt: SDL3 via FetchContent per Emscripten, --preload-file data
- Makefile: target wasm amb Docker (emscripten/emsdk)
- Build de Linux verificat, segueix funcionant correctament

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

CMakeLists.txt

@@ -30,8 +30,24 @@ if(NOT SOURCES)
 endif()
 
 # Configuración de SDL3
+if(EMSCRIPTEN)
+    # En Emscripten, SDL3 se compila desde source con FetchContent
+    include(FetchContent)
+    FetchContent_Declare(
+        SDL3
+        GIT_REPOSITORY https://github.com/libsdl-org/SDL.git
+        GIT_TAG release-3.2.12
+        GIT_SHALLOW TRUE
+    )
+    set(SDL_SHARED OFF CACHE BOOL "" FORCE)
+    set(SDL_STATIC ON CACHE BOOL "" FORCE)
+    set(SDL_TEST_LIBRARY OFF CACHE BOOL "" FORCE)
+    FetchContent_MakeAvailable(SDL3)
+    message(STATUS "SDL3 compilado desde source para Emscripten")
+else()
     find_package(SDL3 REQUIRED CONFIG REQUIRED COMPONENTS SDL3)
     message(STATUS "SDL3 encontrado: ${SDL3_INCLUDE_DIRS}")
+endif()
 
 # Configuración común de salida de ejecutables en el directorio raíz
 set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_SOURCE_DIR})
@@ -66,6 +82,14 @@ elseif(APPLE)
             -rpath @executable_path/../Frameworks/
         )
     endif()
+elseif(EMSCRIPTEN)
+    target_compile_definitions(${PROJECT_NAME} PRIVATE EMSCRIPTEN_BUILD)
+    target_link_options(${PROJECT_NAME} PRIVATE
+        --preload-file ${CMAKE_SOURCE_DIR}/data@/data
+        -sALLOW_MEMORY_GROWTH=1
+        -sMAX_WEBGL_VERSION=2
+    )
+    set_target_properties(${PROJECT_NAME} PROPERTIES SUFFIX ".html")
 elseif(UNIX AND NOT APPLE)
     target_compile_definitions(${PROJECT_NAME} PRIVATE LINUX_BUILD)
     target_link_options(${PROJECT_NAME} PRIVATE -Wl,--gc-sections)

Makefile

@@ -236,6 +236,18 @@ linux_release:
 # Elimina la carpeta temporal
 	$(RMDIR) "$(RELEASE_FOLDER)"
 
+# ==============================================================================
+# COMPILACIÓN PARA WEBASSEMBLY (requiere Docker)
+# ==============================================================================
+wasm:
+	@echo "Compilando para WebAssembly - Version: $(VERSION)"
+	docker run --rm \
+		-v $(DIR_ROOT):/src \
+		-w /src \
+		emscripten/emsdk:latest \
+		bash -c "emcmake cmake -S . -B build_wasm -DCMAKE_BUILD_TYPE=Release && cmake --build build_wasm"
+	@echo "Output: build_wasm/coffee_crisis.html, .js, .wasm, .data"
+
 # ==============================================================================
 # REGLAS ESPECIALES
 # ==============================================================================
@@ -255,9 +267,10 @@ help:
 	@echo "    make windows_release - Crear release para Windows"
 	@echo "    make linux_release   - Crear release para Linux"
 	@echo "    make macos_release   - Crear release para macOS"
+	@echo "    make wasm            - Compilar para WebAssembly (requiere Docker)"
 	@echo ""
 	@echo "  Otros:"
 	@echo "    make show_version    - Mostrar version actual ($(VERSION))"
 	@echo "    make help            - Mostrar esta ayuda"
 
-.PHONY: all debug release windows_release macos_release linux_release show_version help
+.PHONY: all debug release windows_release macos_release linux_release wasm show_version help

source/director.cpp

@@ -4,8 +4,10 @@
 #include <errno.h>     // for errno, EEXIST, EACCES, ENAMETOO...
 #include <stdio.h>     // for printf, perror
 #include <string.h>    // for strcmp
+#ifndef __EMSCRIPTEN__
 #include <sys/stat.h>  // for mkdir, stat, S_IRWXU
 #include <unistd.h>    // for getuid
+#endif
 
 #include <cstdlib>   // for exit, EXIT_FAILURE, srand
 #include <fstream>   // for basic_ostream, operator<<, basi...
@@ -27,7 +29,7 @@
 #include "title.h"         // for Title
 #include "utils.h"         // for options_t, input_t, boolToString
 
-#ifndef _WIN32
+#if !defined(_WIN32) && !defined(__EMSCRIPTEN__)
 #include <pwd.h>
 #endif
 
@@ -385,6 +387,12 @@ void Director::initOptions() {
     options->difficulty = DIFFICULTY_NORMAL;
     options->language = ba_BA;
     options->console = false;
+
+#ifdef __EMSCRIPTEN__
+    // En Emscripten la ventana la gestiona el navegador
+    options->windowSize = 1;
+    options->videoMode = 0;
+#endif
 }
 
 // Comprueba los parametros del programa
@@ -402,7 +410,10 @@ void Director::checkProgramArguments(int argc, const char *argv[]) {
 
 // Crea la carpeta del sistema donde guardar datos
 void Director::createSystemFolder(const std::string &folder) {
-#ifdef _WIN32
+#ifdef __EMSCRIPTEN__
+    // En Emscripten usamos una carpeta en MEMFS (no persistente)
+    systemFolder = "/config/" + folder;
+#elif _WIN32
     systemFolder = std::string(getenv("APPDATA")) + "/" + folder;
 #elif __APPLE__
     struct passwd *pw = getpwuid(getuid());
@@ -424,6 +435,10 @@ void Director::createSystemFolder(const std::string &folder) {
     }
 #endif
 
+#ifdef __EMSCRIPTEN__
+    // En Emscripten no necesitamos crear carpetas (MEMFS las crea automáticamente)
+    (void)folder;
+#else
     struct stat st = {0};
     if (stat(systemFolder.c_str(), &st) == -1) {
         errno = 0;
@@ -453,6 +468,7 @@ void Director::createSystemFolder(const std::string &folder) {
             }
         }
     }
+#endif
 }
 
 // Carga el fichero de configuración