Fase 1: Migración inicial a C++20 modules

Implementada la estructura base de módulos para vibe2_modules:

- Configurado CMakeLists.txt para soportar C++23 y módulos
- Creado módulo core.cppm con tipos básicos (Color, ColorTheme, constantes)
- Creado módulo sdl_wrapper.cppm para encapsular SDL3
- Migrado defines.h completamente al módulo core
- Actualizado ball.h y ball.cpp para usar el módulo core
- Actualizado main.cpp para importar y usar el módulo core
- Eliminado defines.h obsoleto

El proyecto ahora compila y funciona con módulos C++20.
Próximos pasos: crear módulos especializados (physics, rendering, etc.)

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

source/modules/core.cppm

@@ -0,0 +1,57 @@
+export module vibe2.core;
+
+#include <cstdint>
+
+export namespace vibe2 {
+    // Constantes de pantalla
+    constexpr char WINDOW_CAPTION[] = "vibe2_modules";
+    constexpr int SCREEN_WIDTH = 320;
+    constexpr int SCREEN_HEIGHT = 240;
+    constexpr int WINDOW_SIZE = 3;
+    constexpr int BALL_SIZE = 10;
+    constexpr float GRAVITY_FORCE = 0.2f;
+    constexpr std::uint64_t TEXT_DURATION = 2000;
+
+    // Tipos básicos
+    struct Color {
+        int r, g, b;
+
+        constexpr Color(int red = 0, int green = 0, int blue = 0)
+            : r(red), g(green), b(blue) {}
+    };
+
+    struct Position {
+        float x, y;
+
+        constexpr Position(float px = 0.0f, float py = 0.0f)
+            : x(px), y(py) {}
+    };
+
+    struct Velocity {
+        float vx, vy;
+
+        constexpr Velocity(float x_vel = 0.0f, float y_vel = 0.0f)
+            : vx(x_vel), vy(y_vel) {}
+    };
+
+    // Enums para el sistema de temas
+    enum class ColorTheme {
+        SUNSET = 0,
+        OCEAN = 1,
+        NEON = 2,
+        FOREST = 3
+    };
+
+    // Constantes útiles para la física
+    namespace physics {
+        constexpr float FRICTION_FACTOR = 0.97f;
+        constexpr float VELOCITY_THRESHOLD = 6.0f;
+        constexpr float CONVERSION_FACTOR = 60.0f; // Frame-based to time-based
+    }
+
+    // Constantes para debug
+    namespace debug {
+        constexpr int DEFAULT_TEXT_SIZE = 8; // Píxeles por carácter
+        constexpr int MARGIN = 8; // Margen por defecto
+    }
+}

source/modules/external/sdl_wrapper.cppm

@@ -0,0 +1,107 @@
+export module vibe2.external.sdl_wrapper;
+
+// Incluir headers de SDL3
+#include <cstdint>
+#include <SDL3/SDL_error.h>
+#include <SDL3/SDL_events.h>
+#include <SDL3/SDL_init.h>
+#include <SDL3/SDL_keycode.h>
+#include <SDL3/SDL_render.h>
+#include <SDL3/SDL_stdinc.h>
+#include <SDL3/SDL_timer.h>
+#include <SDL3/SDL_video.h>
+#include <SDL3/SDL_rect.h>
+
+export namespace vibe2::sdl {
+    // Re-exportar tipos de SDL que usamos frecuentemente
+    using Window = SDL_Window;
+    using Renderer = SDL_Renderer;
+    using Event = SDL_Event;
+    using FRect = SDL_FRect;
+    using Vertex = SDL_Vertex;
+    using Texture = SDL_Texture;
+
+    // Re-exportar constantes de SDL
+    constexpr auto INIT_VIDEO = SDL_INIT_VIDEO;
+    constexpr auto WINDOW_OPENGL = SDL_WINDOW_OPENGL;
+    constexpr auto EVENT_QUIT = SDL_EVENT_QUIT;
+    constexpr auto EVENT_KEY_DOWN = SDL_EVENT_KEY_DOWN;
+    constexpr auto LOGICAL_PRESENTATION_INTEGER_SCALE = SDL_LOGICAL_PRESENTATION_INTEGER_SCALE;
+
+    // Re-exportar teclas que usamos
+    constexpr auto KEY_ESCAPE = SDLK_ESCAPE;
+    constexpr auto KEY_SPACE = SDLK_SPACE;
+    constexpr auto KEY_G = SDLK_G;
+    constexpr auto KEY_V = SDLK_V;
+    constexpr auto KEY_H = SDLK_H;
+    constexpr auto KEY_T = SDLK_T;
+    constexpr auto KEY_F1 = SDLK_F1;
+    constexpr auto KEY_F2 = SDLK_F2;
+    constexpr auto KEY_F3 = SDLK_F3;
+    constexpr auto KEY_F4 = SDLK_F4;
+    constexpr auto KEY_1 = SDLK_1;
+    constexpr auto KEY_2 = SDLK_2;
+    constexpr auto KEY_3 = SDLK_3;
+    constexpr auto KEY_4 = SDLK_4;
+    constexpr auto KEY_5 = SDLK_5;
+    constexpr auto KEY_6 = SDLK_6;
+    constexpr auto KEY_7 = SDLK_7;
+    constexpr auto KEY_8 = SDLK_8;
+
+    // Wrapper functions para funciones de SDL más usadas
+    inline bool init(Uint32 flags) {
+        return SDL_Init(flags);
+    }
+
+    inline void quit() {
+        SDL_Quit();
+    }
+
+    inline Window* createWindow(const char* title, int w, int h, Uint64 flags) {
+        return SDL_CreateWindow(title, w, h, flags);
+    }
+
+    inline void destroyWindow(Window* window) {
+        SDL_DestroyWindow(window);
+    }
+
+    inline Renderer* createRenderer(Window* window, const char* name) {
+        return SDL_CreateRenderer(window, name);
+    }
+
+    inline void destroyRenderer(Renderer* renderer) {
+        SDL_DestroyRenderer(renderer);
+    }
+
+    inline bool setRenderDrawColor(Renderer* renderer, Uint8 r, Uint8 g, Uint8 b, Uint8 a) {
+        return SDL_SetRenderDrawColor(renderer, r, g, b, a);
+    }
+
+    inline bool setRenderLogicalPresentation(Renderer* renderer, int w, int h, SDL_RendererLogicalPresentation mode) {
+        return SDL_SetRenderLogicalPresentation(renderer, w, h, mode);
+    }
+
+    inline bool setRenderVSync(Renderer* renderer, int vsync) {
+        return SDL_SetRenderVSync(renderer, vsync);
+    }
+
+    inline bool renderGeometry(Renderer* renderer, Texture* texture, const Vertex* vertices, int num_vertices, const int* indices, int num_indices) {
+        return SDL_RenderGeometry(renderer, texture, vertices, num_vertices, indices, num_indices);
+    }
+
+    inline bool renderPresent(Renderer* renderer) {
+        return SDL_RenderPresent(renderer);
+    }
+
+    inline bool pollEvent(Event* event) {
+        return SDL_PollEvent(event);
+    }
+
+    inline Uint64 getTicks() {
+        return SDL_GetTicks();
+    }
+
+    inline const char* getError() {
+        return SDL_GetError();
+    }
+}