diff --git a/data/gbc.glsl b/data/gbc.glsl
new file mode 100644
index 0000000..8dc26f2
--- /dev/null
+++ b/data/gbc.glsl
@@ -0,0 +1,38 @@
+varying vec2 tex_coord;
+varying vec2 pix_coord;
+
+#if defined(VERTEX)
+
+void main()
+{
+	pix_coord = vec2(gl_MultiTexCoord0.x, 1.0-gl_MultiTexCoord0.y)*1.0001;
+	tex_coord = vec2((gl_Vertex.x+1.0)*0.5, (-gl_Vertex.y+1.0)*0.5);
+	vec4 pos = vec4(gl_Vertex.x * 2.0, gl_Vertex.y * 2.0, gl_Vertex.z, gl_Vertex.w);
+	gl_Position = gl_Vertex; //(gl_Vertex*2)-vec3(1.0, 1.0, 1.0);//gl_ModelViewProjectionMatrix * gl_Vertex;
+}
+
+#elif defined(FRAGMENT)
+
+uniform sampler2D Texture;
+
+void main()
+{
+	float x = sign(pix_coord.x)*floor(abs(pix_coord.x)+0.5);
+	float y = sign(pix_coord.y)*floor(abs(pix_coord.y)+0.5);
+	float column = mod(x,4.0);
+	float row = mod(y,4.0);
+	vec4 color = texture2D(Texture, tex_coord);
+	vec4 newcolor;
+	if ((column == 0.0) || (row == 0.0) ) {
+		newcolor = color * vec4(0.4, 0.4, 0.4, 1.0);
+	} else if ((column == 1.0) || (row == 1.0) ) {
+		newcolor = color * vec4(0.6, 0.7, 0.8, 1.0);
+	} else if ((column == 3.0) || (row == 3.0) ) {
+		newcolor = color * vec4(0.8, 0.7, 0.6, 1.0);
+	} else {
+		newcolor = color;
+	}
+	gl_FragColor = newcolor;
+}
+
+#endif
\ No newline at end of file
diff --git a/data/lynx.glsl b/data/lynx.glsl
new file mode 100644
index 0000000..6b6787f
--- /dev/null
+++ b/data/lynx.glsl
@@ -0,0 +1,41 @@
+varying vec2 tex_coord;
+varying vec2 pix_coord;
+
+#if defined(VERTEX)
+
+void main()
+{
+	pix_coord = vec2(gl_MultiTexCoord0.x, 1.0-gl_MultiTexCoord0.y)*1.0001;
+	tex_coord = vec2((gl_Vertex.x+1.0)*0.5, (-gl_Vertex.y+1.0)*0.5);
+	vec4 pos = vec4(gl_Vertex.x * 2.0, gl_Vertex.y * 2.0, gl_Vertex.z, gl_Vertex.w);
+	gl_Position = gl_Vertex; //(gl_Vertex*2)-vec3(1.0, 1.0, 1.0);//gl_ModelViewProjectionMatrix * gl_Vertex;
+}
+
+#elif defined(FRAGMENT)
+
+uniform sampler2D Texture;
+
+void main()
+{
+	float x = sign(pix_coord.x)*floor(abs(pix_coord.x)+0.5);
+	float column = mod(x,4.0);
+	vec4 color = texture2D(Texture, tex_coord);
+	float xfade = abs((tex_coord.s * 2.0) - 1.0);
+	xfade = xfade * xfade * xfade * xfade * xfade;
+	float yfade = abs((tex_coord.t * 2.0) - 1.0);
+	yfade = yfade * yfade * yfade * yfade * yfade;
+	color = color + vec4(0.7, 0.7, 0.7, 0.0) * (1.0-tex_coord.t) * (1.0-xfade) * (1.0-yfade);
+	vec4 newcolor;
+	if (column == 0.0) {
+		newcolor = color * vec4(1.0, 0.4, 0.6, 1.0);
+	} else if (column == 1.0) {
+		newcolor = color * vec4(0.4, 1.0, 0.4, 1.0);
+	} else if (column == 2.0) {
+		newcolor = color * vec4(0.6, 0.4, 1.0, 1.0);
+	} else {
+		newcolor = color * vec4(0.2, 0.2, 0.2, 1.0);
+	}
+	gl_FragColor = newcolor;
+}
+
+#endif
diff --git a/source/aux_textfile.cpp b/source/aux_textfile.cpp
index f7fbba0..69385b6 100644
--- a/source/aux_textfile.cpp
+++ b/source/aux_textfile.cpp
@@ -22,7 +22,7 @@ namespace textfile
 
     const bool open(std::string filename)
     {
-        buffer = file_getfilebuffer(filename.c_str(), fsize);
+        buffer = file::getFileBuffer(filename.c_str(), fsize);
         p = 0;
 
         return true;
diff --git a/source/gamestate_password.cpp b/source/gamestate_password.cpp
index e7453e7..9fca910 100644
--- a/source/gamestate_password.cpp
+++ b/source/gamestate_password.cpp
@@ -120,7 +120,7 @@ namespace gamestate
         {
             password[10] = 0;
             int filesize = 0;
-            const char *buffer = file_getfilebuffer("offsets.bal", filesize);
+            const char *buffer = file::getFileBuffer("offsets.bal", filesize);
 
             int punter = 0;
 
diff --git a/source/gamestate_postfase.cpp b/source/gamestate_postfase.cpp
index 4fa8cbb..74e4e61 100644
--- a/source/gamestate_postfase.cpp
+++ b/source/gamestate_postfase.cpp
@@ -104,7 +104,7 @@ namespace gamestate
         std::string getPassword()
         {
             int size;
-            char *buffer = file_getfilebuffer("offsets.bal", size);
+            char *buffer = file::getFileBuffer("offsets.bal", size);
 
             int punter = (game::getConfig("fase")-1)*10;
             char passFile[11];
diff --git a/source/gamestate_sequence.cpp b/source/gamestate_sequence.cpp
index 40783b7..ef4416a 100644
--- a/source/gamestate_sequence.cpp
+++ b/source/gamestate_sequence.cpp
@@ -34,7 +34,7 @@ namespace gamestate
             }
 
             int size;
-            sequence_file = file_getfilepointer(filename.c_str(), size);
+            sequence_file = file::getFilePointer(filename.c_str(), size);
 
             game::setState(&gamestate::sequence::loop);
         }
diff --git a/source/jaudio.cpp b/source/jaudio.cpp
index 1815095..ced852b 100644
--- a/source/jaudio.cpp
+++ b/source/jaudio.cpp
@@ -155,7 +155,7 @@ namespace audio {
     audio::music *loadMusic(const char* filename)
     {
         int size;
-        char *buffer = file_getfilebuffer(filename, size);
+        char *buffer = file::getFileBuffer(filename, size);
         if (buffer == nullptr) {
             SDL_LogError(SDL_LOG_CATEGORY_ERROR, "ERROR (audio::loadMusic): No s'ha trobat l'arxiu %s\n", filename);
             exit(1);
@@ -322,7 +322,7 @@ namespace audio {
     audio::sound *loadSound(const char* filename)
     {
         int size;
-        uint8_t *buffer = (uint8_t *)file_getfilebuffer(filename, size);
+        uint8_t *buffer = (uint8_t *)file::getFileBuffer(filename, size);
 
         if (buffer == nullptr) {
             SDL_LogError(SDL_LOG_CATEGORY_ERROR, "ERROR (audio::loadSound): No s'ha trobat l'arxiu %s\n", filename);
diff --git a/source/jdraw.cpp b/source/jdraw.cpp
index a45d508..e6d741c 100644
--- a/source/jdraw.cpp
+++ b/source/jdraw.cpp
@@ -2,6 +2,7 @@
 #include "SDL3/SDL.h"
 #include "gif.h"
 #include "jfile.h"
+#include "jshader.h"
 
 namespace draw
 {
@@ -13,9 +14,13 @@ namespace draw
     SDL_Window      *sdl_window     {nullptr};  // La finestra de SDL
     SDL_Renderer    *sdl_renderer   {nullptr};  // El renderer de SDL
     SDL_Texture     *sdl_texture    {nullptr};  // La textura de SDL a la que pintarem la nostra superficie "screen" i que despres volcarem a pantalla
+    SDL_Texture     *sdl_shadertex  {nullptr};  // La textura de SDL per al shader
 
     static int      screen_zoom = 1;
     static bool     screen_fullscreen = false;
+    static bool     screen_cursor = true;
+    static char*    screen_shader = nullptr;
+    static bool     shader_enabled = false;
     static float    window_ratio = 1;
     static int      canvas_width;
     static int      canvas_height;
@@ -51,13 +56,17 @@ namespace draw
 
         // Ajustem el tamany de la finestra, segons el zoom i el ratio
         window_width = canvas_width*screen_zoom;
-        window_height = window_ratio != 1 ? canvas_width*window_ratio*screen_zoom : canvas_height*screen_zoom;
+        window_height = window_ratio != 1 ? int(float(canvas_width)*window_ratio*float(screen_zoom)) : canvas_height*screen_zoom;
 
         // Mentres no càpiga en la pantalla, reduïm el zoom
         while (window_width > desktop_width || window_height > desktop_height) {
             screen_zoom--;
             window_width = canvas_width*screen_zoom;
-            window_height = window_ratio != 1 ? canvas_width*window_ratio*screen_zoom : canvas_height*screen_zoom;
+            window_height = window_ratio != 1 ? int(float(canvas_width)*window_ratio*float(screen_zoom)) : canvas_height*screen_zoom;
+        }
+        if (screen_fullscreen) {
+            window_width = desktop_width;
+            window_height = desktop_height;
         }
 
         sdl_window = SDL_CreateWindow(window_title, window_width, window_height, SDL_WINDOW_OPENGL|(screen_fullscreen?SDL_WINDOW_FULLSCREEN:0));
@@ -66,6 +75,25 @@ namespace draw
             exit(1);
         }
 
+        sdl_renderer = SDL_CreateRenderer(sdl_window, NULL);
+        if (!sdl_renderer) {
+            SDL_LogError(SDL_LOG_CATEGORY_VIDEO, "ERROR (draw::init): Failed to initialize renderer!\n");
+            exit(1);
+        }
+
+        if (screen_cursor) SDL_ShowCursor(); else SDL_HideCursor();
+
+        sdl_texture = SDL_CreateTexture(sdl_renderer, SDL_PIXELFORMAT_ARGB8888, SDL_TEXTUREACCESS_STREAMING, canvas_width, canvas_height);
+        SDL_SetTextureScaleMode(sdl_texture, SDL_SCALEMODE_NEAREST);
+        if (!sdl_texture) {
+            SDL_LogError(SDL_LOG_CATEGORY_VIDEO, "ERROR (draw::init): Failed to initialize texture!\n");
+            exit(1);
+        }
+
+        sdl_shadertex = SDL_CreateTexture(sdl_renderer, SDL_PIXELFORMAT_ARGB8888, SDL_TEXTUREACCESS_TARGET, window_width, window_height);
+        SDL_SetTextureScaleMode(sdl_shadertex, SDL_SCALEMODE_NEAREST);
+
+        loadShader();
     }
 
     void destroyDisplay()
@@ -93,7 +121,9 @@ namespace draw
         desktop_width = dm->w;
         desktop_height = dm->h;
 
+        createDisplay();
         // Inicialització de les estructures de SDL
+        /*
         sdl_window = SDL_CreateWindow(titol, width * zoom, height * zoom, 0);
         if (!sdl_window) {
             SDL_LogCritical(SDL_LOG_CATEGORY_VIDEO, "ERROR (draw::init): Failed to initialize window!\n");
@@ -110,6 +140,7 @@ namespace draw
             SDL_LogError(SDL_LOG_CATEGORY_VIDEO, "ERROR (draw::init): Failed to initialize texture!\n");
             exit(1);
         }
+        */
 
         // Creem la superficie "screen" i la establim com a superficie destinació
         screen = createSurface(width, height);
@@ -120,7 +151,7 @@ namespace draw
         sel_color = transparent = 0;
         for (int i=0;i<256;++i) color_indices[i] = i;
 
-        SDL_HideCursor();
+        //SDL_HideCursor();
         //textsurf = loadSurface("font.gif");
     }
 
@@ -136,9 +167,7 @@ namespace draw
         }
 
         // Destruim tot el relacionat amb SDL
-        SDL_DestroyTexture(sdl_texture);
-        SDL_DestroyRenderer(sdl_renderer);
-        SDL_DestroyWindow(sdl_window);
+        destroyDisplay();
 
         // Fiquem tots els punters a nullptr, per si de cas no estem eixint del programa
         // i anem a tornar a inicialitzar el sistema
@@ -148,11 +177,81 @@ namespace draw
         screen = destination = source = nullptr;
     }
 
+    void setZoom(const int value) {
+        screen_zoom = value;
+        destroyDisplay();
+        createDisplay();
+        char strzoom[3];
+        file::setConfigValue("zoom", SDL_itoa(screen_zoom, strzoom, 10));
+    }
+
     const int getZoom()
     {
         return screen_zoom;
     }
 
+    const float getScaleX()
+    {
+        return float(window_width) / float(canvas_width);
+    }
+
+    const float getScaleY()
+    {
+        return float(window_height) / float(canvas_height);
+    }
+
+    bool getFullscreen() {
+        return screen_fullscreen;
+    }
+
+    void setFullscreen(const bool value) {
+        screen_fullscreen=value;
+        destroyDisplay();
+        createDisplay();
+        file::setConfigValue("fullscreen", screen_fullscreen?"true":"false");
+    }
+
+    void loadShader()
+    {
+        char *buffer = nullptr;
+        if (screen_shader) {
+            int size;
+            buffer = file::getFileBuffer(screen_shader, size, true);
+        }
+        shader::setAspectRatio(3.0f/4.0f);
+        shader::init(sdl_window, sdl_shadertex, buffer);
+        if (buffer) free(buffer);
+    }
+
+    void setShader(const char* shader_file)
+    {
+        if (screen_shader) free(screen_shader);
+        screen_shader = (char*)malloc(strlen(shader_file)+1);
+        strcpy(screen_shader, shader_file);
+        loadShader();
+    }
+
+    void enableShader()
+    {
+        shader_enabled = true;
+        shader::enable();
+        //destroyDisplay();
+        //createDisplay();
+    }
+
+    void disableShader()
+    {
+        shader_enabled = false;
+        shader::disable();
+        //destroyDisplay();
+        //createDisplay();
+    }
+
+    void toggleShader()
+    {
+        shader_enabled ? disableShader() : enableShader();
+    }
+
     // Crea una superficie i torna un punter a ella
     surface *createSurface(const uint16_t w, const uint16_t h)
     {
@@ -176,7 +275,7 @@ namespace draw
         // Agafem un buffer de bytes de l'arxiu especificat
         // getFileBuffer() simplement ens torna el arxiu sencer dins de un array de char
         int size;
-        uint8_t *buffer = (uint8_t *)file_getfilebuffer(filename, size);
+        uint8_t *buffer = (uint8_t *)file::getFileBuffer(filename, size);
 
         // Si ens ha tornat nullptr, es que no l'ha trobat, tornem nosaltres també nullptr ja que no s'ha pogut crear la superficie
         if (buffer == nullptr)
@@ -292,7 +391,7 @@ namespace draw
         // Agafem un buffer de bytes de l'arxiu especificat
         // getFileBuffer() simplement ens torna el arxiu sencer dins de un array de char
         int size;
-        uint8_t *buffer = (uint8_t *)file_getfilebuffer(filename, size);
+        uint8_t *buffer = (uint8_t *)file::getFileBuffer(filename, size);
 
         // Li passem el array del arxiu a LoadPalette. Ell ens torna un array de uint32_t amb la paleta
         // Van a ser 256 entrades de 32 bits, cada entrada es un color, amb el format 0xAARRGGBB
@@ -565,11 +664,13 @@ namespace draw
         // Desbloquejem la textura
         SDL_UnlockTexture(sdl_texture);
 
+        SDL_SetRenderTarget(sdl_renderer, sdl_shadertex);
         // Pintem la textura a pantalla
         SDL_RenderTexture(sdl_renderer, sdl_texture, NULL, NULL);
 
         // I ho presentem
-        SDL_RenderPresent(sdl_renderer);
+        shader::render();
+        //SDL_RenderPresent(sdl_renderer);
     }
     
 }
diff --git a/source/jdraw.h b/source/jdraw.h
index 126907b..04f5d40 100644
--- a/source/jdraw.h
+++ b/source/jdraw.h
@@ -25,13 +25,25 @@ namespace draw
     /// @param width es el ample de la finestra "virtual"
     /// @param height es el alt de la finestra "virtual"
     /// @param zoom es com de grans son els pixels.
-    void init(const char *titol, const uint16_t width, const uint16_t height, const int zoom, const float ratio=1.0);
+    void init(const char *titol, const uint16_t width, const uint16_t height, const int zoom, const bool fullscreen=false, const float ratio=1.0);
 
     /// @brief Finalització del sistema (tancar coses de SDL, superficies fixes, etc...)
     void quit();
 
+    void setZoom(const int value);
     const int getZoom();
-    
+    const float getScaleX();
+    const float getScaleY();
+
+    bool getFullscreen();
+    void setFullscreen(const bool value);
+
+    void loadShader();
+    void setShader(const char* shader_file);
+    void enableShader();
+    void disableShader();
+    void toggleShader();
+
     /// @brief Crea una superficie i torna un punter a ella
     /// @param w ample de la superficie
     /// @param h alt de la superficie
diff --git a/source/jfile.cpp b/source/jfile.cpp
index daa38ba..03eea08 100644
--- a/source/jfile.cpp
+++ b/source/jfile.cpp
@@ -19,213 +19,216 @@
 #define DEFAULT_FOLDER      "data/"
 #define CONFIG_FILENAME      "config.txt"
 
-struct file_t
+namespace file
 {
-    std::string      path;
-    uint32_t    size;
-    uint32_t    offset;
-};
-
-std::vector<file_t> toc;
-
-/* El std::map me fa coses rares, vaig a usar un good old std::vector amb una estructura key,value propia i au, que sempre funciona */
-struct keyvalue_t {
-	std::string key, value;
-};
-
-char *resource_filename = NULL;
-char *resource_folder = NULL;
-int file_source = SOURCE_FILE;
-char scratch[255];
-static std::string config_folder;
-std::vector<keyvalue_t> config;
-
-void file_setresourcefilename(const char *str) {
-    if (resource_filename != NULL) free(resource_filename);
-    resource_filename = (char*)malloc(strlen(str)+1);
-    strcpy(resource_filename, str);
-}
-
-void file_setresourcefolder(const char *str) {
-    if (resource_folder != NULL) free(resource_folder);
-    resource_folder = (char*)malloc(strlen(str)+1);
-    strcpy(resource_folder, str);
-}
-
-void file_setsource(const int src) {
-    file_source = src%2; // mod 2 so it always is a valid value, 0 (file) or 1 (folder)
-	if (src==SOURCE_FOLDER && resource_folder==NULL) file_setresourcefolder(DEFAULT_FOLDER);
-}
-
-bool file_getdictionary() {
-    if (resource_filename == NULL) file_setresourcefilename(DEFAULT_FILENAME);
-
-	std::ifstream fi (resource_filename, std::ios::binary);
-    if (!fi.is_open()) return false;
-    char header[4];
-    fi.read(header, 4);
-    uint32_t num_files, toc_offset;
-    fi.read((char*)&num_files, 4);
-    fi.read((char*)&toc_offset, 4);
-    fi.seekg(toc_offset);
-
-    for (uint i=0; i<num_files; ++i) 
-    {
-        uint32_t file_offset, file_size;
-        fi.read( (char*)&file_offset, 4 );
-        fi.read( (char*)&file_size, 4 );
-        uint8_t path_size;
-        fi.read( (char*)&path_size, 1 );
-        char file_name[path_size+1];
-        fi.read( file_name, path_size );
-        file_name[path_size] = 0;
-        std::string filename = file_name;
-        toc.push_back({filename, file_size, file_offset});
-    }
-    fi.close();
-	return true;
-}
-
-char *file_getfilenamewithfolder(const char* filename) {
-	strcpy(scratch, resource_folder);
-	strcat(scratch, filename);
-	return scratch;
-}
-
-FILE *file_getfilepointer(const char *resourcename, int& filesize, const bool binary) {
-
-    if (file_source==SOURCE_FILE and toc.size()==0) {
-        if (not file_getdictionary()) file_setsource(SOURCE_FOLDER);
-    }
-
-    FILE *f;
-
-    if (file_source==SOURCE_FILE) {
-	    bool found = false;
-	    uint32_t count = 0;
-	    while( !found && count < toc.size() ) {
-		    found = ( std::string(resourcename) == toc[count].path );
-		    if( !found ) count++;
-	    }
-
-	    if( !found ) {
-		    perror("El recurs no s'ha trobat en l'arxiu de recursos");
-		    exit(1);
-	    }
-
-	    filesize = toc[count].size;
-
-        f = fopen(resource_filename, binary?"rb":"r");
-	    if (not f) {
-		    perror("No s'ha pogut obrir l'arxiu de recursos");
-		    exit(1);
-	    }
-        fseek(f, toc[count].offset, SEEK_SET);
-	} else {
-		f = fopen(file_getfilenamewithfolder(resourcename), binary?"rb":"r");
-		fseek(f, 0, SEEK_END);
-		filesize = ftell(f);
-        fseek(f, 0, SEEK_SET);
-	}
-	return f;
-}
-
-char *file_getfilebuffer(const char *resourcename, int& filesize, const bool zero_terminate) {
-	FILE *f = file_getfilepointer(resourcename, filesize, true);
-	char* buffer = (char*)malloc(zero_terminate?filesize:filesize+1);
-	fread(buffer, filesize, 1, f);
-	if (zero_terminate) buffer[filesize]=0;
-	fclose(f);
-	return buffer;
-}
-
-// Crea la carpeta del sistema donde guardar datos
-void file_setconfigfolder(const char *foldername)
-{
-#ifdef _WIN32
-	config_folder = std::string(getenv("APPDATA")) + "/" + foldername;
-#elif __APPLE__
-	struct passwd *pw = getpwuid(getuid());
-	const char *homedir = pw->pw_dir;
-	config_folder = std::string(homedir) + "/Library/Application Support/" + foldername;
-#elif __linux__
-	struct passwd *pw = getpwuid(getuid());
-	const char *homedir = pw->pw_dir;
-	config_folder = std::string(homedir) + "/." + foldername;
-#endif
-
-	struct stat st = {0};
-	if (stat(config_folder.c_str(), &st) == -1)
+	struct file_t
 	{
-#ifdef _WIN32
-		int ret = mkdir(config_folder.c_str());
-#else
-		int ret = mkdir(config_folder.c_str(), S_IRWXU);
-#endif
+		std::string     path;
+		uint32_t    	size;
+		uint32_t    	offset;
+	};
 
-		if (ret == -1)
+	std::vector<file_t> toc;
+
+	/* El std::map me fa coses rares, vaig a usar un good old std::vector amb una estructura key,value propia i au, que sempre funciona */
+	struct keyvalue_t {
+		std::string key, value;
+	};
+
+	char *resource_filename = NULL;
+	char *resource_folder = NULL;
+	int file_source = SOURCE_FILE;
+	char scratch[255];
+	static std::string config_folder;
+	std::vector<keyvalue_t> config;
+
+	void setResourceFilename(const char *str) {
+		if (resource_filename != NULL) free(resource_filename);
+		resource_filename = (char*)malloc(strlen(str)+1);
+		strcpy(resource_filename, str);
+	}
+
+	void setResourceFolder(const char *str) {
+		if (resource_folder != NULL) free(resource_folder);
+		resource_folder = (char*)malloc(strlen(str)+1);
+		strcpy(resource_folder, str);
+	}
+
+	void setSource(const int src) {
+		file_source = src%2; // mod 2 so it always is a valid value, 0 (file) or 1 (folder)
+		if (src==SOURCE_FOLDER && resource_folder==NULL) setResourceFolder(DEFAULT_FOLDER);
+	}
+
+	bool getDictionary() {
+		if (resource_filename == NULL) setResourceFilename(DEFAULT_FILENAME);
+
+		std::ifstream fi (resource_filename, std::ios::binary);
+		if (!fi.is_open()) return false;
+		char header[4];
+		fi.read(header, 4);
+		uint32_t num_files, toc_offset;
+		fi.read((char*)&num_files, 4);
+		fi.read((char*)&toc_offset, 4);
+		fi.seekg(toc_offset);
+
+		for (uint i=0; i<num_files; ++i) 
 		{
-			printf("ERROR CREATING CONFIG FOLDER.");
-			exit(EXIT_FAILURE);
+			uint32_t file_offset, file_size;
+			fi.read( (char*)&file_offset, 4 );
+			fi.read( (char*)&file_size, 4 );
+			uint8_t path_size;
+			fi.read( (char*)&path_size, 1 );
+			char file_name[path_size+1];
+			fi.read( file_name, path_size );
+			file_name[path_size] = 0;
+			std::string filename = file_name;
+			toc.push_back({filename, file_size, file_offset});
+		}
+		fi.close();
+		return true;
+	}
+
+	char *getFilenameWithFolder(const char* filename) {
+		strcpy(scratch, resource_folder);
+		strcat(scratch, filename);
+		return scratch;
+	}
+
+	FILE *getFilePointer(const char *resourcename, int& filesize, const bool binary) {
+
+		if (file_source==SOURCE_FILE and toc.size()==0) {
+			if (not getDictionary()) setSource(SOURCE_FOLDER);
+		}
+
+		FILE *f;
+
+		if (file_source==SOURCE_FILE) {
+			bool found = false;
+			uint32_t count = 0;
+			while( !found && count < toc.size() ) {
+				found = ( std::string(resourcename) == toc[count].path );
+				if( !found ) count++;
+			}
+
+			if( !found ) {
+				perror("El recurs no s'ha trobat en l'arxiu de recursos");
+				exit(1);
+			}
+
+			filesize = toc[count].size;
+
+			f = fopen(resource_filename, binary?"rb":"r");
+			if (not f) {
+				perror("No s'ha pogut obrir l'arxiu de recursos");
+				exit(1);
+			}
+			fseek(f, toc[count].offset, SEEK_SET);
+		} else {
+			f = fopen(getFilenameWithFolder(resourcename), binary?"rb":"r");
+			fseek(f, 0, SEEK_END);
+			filesize = ftell(f);
+			fseek(f, 0, SEEK_SET);
+		}
+		return f;
+	}
+
+	char *getFileBuffer(const char *resourcename, int& filesize, const bool zero_terminate) {
+		FILE *f = getFilePointer(resourcename, filesize, true);
+		char* buffer = (char*)malloc(zero_terminate?filesize:filesize+1);
+		fread(buffer, filesize, 1, f);
+		if (zero_terminate) buffer[filesize]=0;
+		fclose(f);
+		return buffer;
+	}
+
+	// Crea la carpeta del sistema donde guardar datos
+	void setConfigFolder(const char *foldername)
+	{
+	#ifdef _WIN32
+		config_folder = std::string(getenv("APPDATA")) + "/" + foldername;
+	#elif __APPLE__
+		struct passwd *pw = getpwuid(getuid());
+		const char *homedir = pw->pw_dir;
+		config_folder = std::string(homedir) + "/Library/Application Support/" + foldername;
+	#elif __linux__
+		struct passwd *pw = getpwuid(getuid());
+		const char *homedir = pw->pw_dir;
+		config_folder = std::string(homedir) + "/." + foldername;
+	#endif
+
+		struct stat st = {0};
+		if (stat(config_folder.c_str(), &st) == -1)
+		{
+	#ifdef _WIN32
+			int ret = mkdir(config_folder.c_str());
+	#else
+			int ret = mkdir(config_folder.c_str(), S_IRWXU);
+	#endif
+
+			if (ret == -1)
+			{
+				printf("ERROR CREATING CONFIG FOLDER.");
+				exit(EXIT_FAILURE);
+			}
 		}
 	}
-}
 
-const char *file_getconfigfolder() {
-	std::string folder = config_folder + "/";
-	return folder.c_str();
-}
+	const char *getConfigFolder() {
+		std::string folder = config_folder + "/";
+		return folder.c_str();
+	}
 
-void file_loadconfigvalues() {
-	config.clear();
-	std::string config_file = config_folder + "/config.txt";
-	FILE *f = fopen(config_file.c_str(), "r");
-    if (!f) return;
+	void loadConfigValues() {
+		config.clear();
+		std::string config_file = config_folder + "/config.txt";
+		FILE *f = fopen(config_file.c_str(), "r");
+		if (!f) return;
 
-    char line[1024];
-    while (fgets(line, sizeof(line), f)) {
-		char *value = strchr(line, '=');
-        if (value) {
-			*value='\0'; value++;
-            value[strlen(value)-1] = '\0';
-			config.push_back({line, value});
-        }
-    }
-    fclose(f);
-}
-
-void file_saveconfigvalues() {
-	std::string config_file = config_folder + "/config.txt";
-	FILE *f = fopen(config_file.c_str(), "w");
-	if (f) {
-		for (auto pair : config) {
-			fprintf(f, "%s=%s\n", pair.key.c_str(), pair.value.c_str());
+		char line[1024];
+		while (fgets(line, sizeof(line), f)) {
+			char *value = strchr(line, '=');
+			if (value) {
+				*value='\0'; value++;
+				value[strlen(value)-1] = '\0';
+				config.push_back({line, value});
+			}
 		}
 		fclose(f);
 	}
-}
 
-const char* file_getconfigvalue(const char *key) {
-	if (config.empty()) file_loadconfigvalues();
-	for (auto pair : config) {
-		if (pair.key == std::string(key)) {
-			strcpy(scratch, pair.value.c_str());
-			return scratch;
+	void saveConfigValues() {
+		std::string config_file = config_folder + "/config.txt";
+		FILE *f = fopen(config_file.c_str(), "w");
+		if (f) {
+			for (auto pair : config) {
+				fprintf(f, "%s=%s\n", pair.key.c_str(), pair.value.c_str());
+			}
+			fclose(f);
 		}
 	}
-	return NULL;
-}
 
-void file_setconfigvalue(const char* key, const char* value) {
-	if (config.empty()) file_loadconfigvalues();
-	for (auto &pair : config) {
-		if (pair.key == std::string(key)) {
-			pair.value = value;
-			file_saveconfigvalues();
-			return;
+	const char* getConfigValue(const char *key) {
+		if (config.empty()) loadConfigValues();
+		for (auto pair : config) {
+			if (pair.key == std::string(key)) {
+				strcpy(scratch, pair.value.c_str());
+				return scratch;
+			}
 		}
+		return NULL;
+	}
+
+	void setConfigValue(const char* key, const char* value) {
+		if (config.empty()) loadConfigValues();
+		for (auto &pair : config) {
+			if (pair.key == std::string(key)) {
+				pair.value = value;
+				saveConfigValues();
+				return;
+			}
+		}
+		config.push_back({key, value});
+		saveConfigValues();
+		return;
 	}
-	config.push_back({key, value});
-	file_saveconfigvalues();
-	return;
 }
diff --git a/source/jfile.h b/source/jfile.h
index 9fe6c9b..9ee4bce 100644
--- a/source/jfile.h
+++ b/source/jfile.h
@@ -4,15 +4,18 @@
 #define SOURCE_FILE         0
 #define SOURCE_FOLDER       1
 
-void file_setconfigfolder(const char *foldername);
-const char *file_getconfigfolder();
+namespace file
+{
+    void setConfigFolder(const char *foldername);
+    const char *getConfigFolder();
 
-void file_setresourcefilename(const char *str);
-void file_setresourcefolder(const char *str);
-void file_setsource(const int src);
+    void setResourceFilename(const char *str);
+    void setResourceFolder(const char *str);
+    void setSource(const int src);
 
-FILE *file_getfilepointer(const char *resourcename, int& filesize, const bool binary=false);
-char *file_getfilebuffer(const char *resourcename, int& filesize, const bool zero_terminate=false);
+    FILE *getFilePointer(const char *resourcename, int& filesize, const bool binary=false);
+    char *getFileBuffer(const char *resourcename, int& filesize, const bool zero_terminate=false);
 
-const char* file_getconfigvalue(const char *key);
-void file_setconfigvalue(const char* key, const char* value);
+    const char* getConfigValue(const char *key);
+    void setConfigValue(const char* key, const char* value);
+}
diff --git a/source/jgame.cpp b/source/jgame.cpp
index afe4ec8..679e940 100644
--- a/source/jgame.cpp
+++ b/source/jgame.cpp
@@ -63,8 +63,8 @@ int main(int argc, char *argv[])
 
     game::windowHasFocus = true;
     game::init();
-    input::init(draw::getZoom());
-
+    input::init();
+    
     static unsigned int current_ticks = SDL_GetTicks();
 
     bool should_exit=false;
@@ -84,7 +84,22 @@ int main(int argc, char *argv[])
             }
             if (e.type==SDL_EVENT_KEY_UP)
             {
-                input::updateKeypressed(e.key.scancode);
+                switch (e.key.scancode) {
+                    case SDL_SCANCODE_F1:
+                        draw::setZoom(draw::getZoom()-1);
+                        break;
+                    case SDL_SCANCODE_F2:
+                        draw::setZoom(draw::getZoom()+1);
+                        break;
+                    case SDL_SCANCODE_F3:
+                        draw::setFullscreen(!draw::getFullscreen());
+                        break;
+                    case SDL_SCANCODE_F4:
+                        draw::toggleShader();
+                        break;
+                    default:
+                        input::updateKeypressed(e.key.scancode);
+                }
             }
             if (e.type==SDL_EVENT_MOUSE_BUTTON_UP)
             {
diff --git a/source/jinput.cpp b/source/jinput.cpp
index 304f363..36b9f73 100644
--- a/source/jinput.cpp
+++ b/source/jinput.cpp
@@ -9,12 +9,10 @@ namespace input
     static uint8_t keydown = 0;
     static uint8_t btnClicked = 0;
     static int wheel = 0;
-    static int screen_zoom = 1;
 
-    void init(const int zoom)
+    void init()
     {
         keys = SDL_GetKeyboardState(NULL);
-        screen_zoom = zoom;
     }
 
     // Determina si la tecla especificada està sent polsada ara mateix
@@ -81,7 +79,7 @@ namespace input
     {
         float x;
         SDL_GetMouseState(&x, NULL);
-        return x/screen_zoom;
+        return x/draw::getScaleX();
     }
 
     // Torna la posició Y actual del ratolí
@@ -89,7 +87,7 @@ namespace input
     {
         float y;
         SDL_GetMouseState(NULL, &y);
-        return y/screen_zoom;
+        return y/draw::getScaleY();
     }
 
     // Determina si el botó del ratolí especificat està sent polsada ara mateix
diff --git a/source/jinput.h b/source/jinput.h
index 77cf9f1..8fc7241 100644
--- a/source/jinput.h
+++ b/source/jinput.h
@@ -14,7 +14,7 @@ namespace input
     }
     
     /// @brief Inicialitza els sistemes de teclat, ratolí i gamepad
-    void init(const int zoom);
+    void init();
     
     /// @brief Determina si la tecla especificada està sent polsada ara mateix
     /// @param key tecla a consultar
diff --git a/source/jshader.cpp b/source/jshader.cpp
new file mode 100644
index 0000000..bc42c1f
--- /dev/null
+++ b/source/jshader.cpp
@@ -0,0 +1,270 @@
+#include "jshader.h"
+
+#include <iostream>
+
+#ifdef __APPLE__
+#include "CoreFoundation/CoreFoundation.h"
+#include <OpenGL/OpenGL.h>
+
+#if ESSENTIAL_GL_PRACTICES_SUPPORT_GL3
+#include <OpenGL/gl3.h>
+#else
+#include <OpenGL/gl.h>
+#endif //!ESSENTIAL_GL_PRACTICES_SUPPORT_GL3
+#else
+#include <SDL3/SDL_opengl.h>
+#include <SDL3/SDL_opengl_glext.h>
+#endif
+
+namespace shader
+{
+    SDL_Window *win = nullptr;
+    SDL_Renderer *renderer = nullptr;
+    GLuint programId = 0;
+    SDL_Texture* backBuffer = nullptr;
+    SDL_FRect window = {0, 0, 640, 480};
+    SDL_FPoint tex_size = {320, 240};
+    float aspect_ratio = 1;
+    bool can_use_opengl = false;
+    bool using_opengl = false;
+    GLuint texture_number;
+    GLuint nose;
+
+    #ifndef __APPLE__
+
+    // I'm avoiding the use of GLEW or some extensions handler, but that 
+    // doesn't mean you should...
+    PFNGLCREATESHADERPROC glCreateShader;
+    PFNGLSHADERSOURCEPROC glShaderSource;
+    PFNGLCOMPILESHADERPROC glCompileShader;
+    PFNGLGETSHADERIVPROC glGetShaderiv;
+    PFNGLGETSHADERINFOLOGPROC glGetShaderInfoLog;
+    PFNGLDELETESHADERPROC glDeleteShader;
+    PFNGLATTACHSHADERPROC glAttachShader;
+    PFNGLCREATEPROGRAMPROC glCreateProgram;
+    PFNGLDELETEPROGRAMPROC glDeleteProgram;
+    PFNGLLINKPROGRAMPROC glLinkProgram;
+    PFNGLVALIDATEPROGRAMPROC glValidateProgram;
+    PFNGLGETPROGRAMIVPROC glGetProgramiv;
+    PFNGLGETPROGRAMINFOLOGPROC glGetProgramInfoLog;
+    PFNGLUSEPROGRAMPROC glUseProgram;
+    PFNGLGETUNIFORMLOCATIONPROC glGetUniformLocation;
+
+    bool initGLExtensions() {
+        glCreateShader = (PFNGLCREATESHADERPROC)SDL_GL_GetProcAddress("glCreateShader");
+        glShaderSource = (PFNGLSHADERSOURCEPROC)SDL_GL_GetProcAddress("glShaderSource");
+        glCompileShader = (PFNGLCOMPILESHADERPROC)SDL_GL_GetProcAddress("glCompileShader");
+        glGetShaderiv = (PFNGLGETSHADERIVPROC)SDL_GL_GetProcAddress("glGetShaderiv");
+        glGetShaderInfoLog = (PFNGLGETSHADERINFOLOGPROC)SDL_GL_GetProcAddress("glGetShaderInfoLog");
+        glDeleteShader = (PFNGLDELETESHADERPROC)SDL_GL_GetProcAddress("glDeleteShader");
+        glAttachShader = (PFNGLATTACHSHADERPROC)SDL_GL_GetProcAddress("glAttachShader");
+        glCreateProgram = (PFNGLCREATEPROGRAMPROC)SDL_GL_GetProcAddress("glCreateProgram");
+        glDeleteProgram = (PFNGLDELETEPROGRAMPROC)SDL_GL_GetProcAddress("glDeleteProgram");
+        glLinkProgram = (PFNGLLINKPROGRAMPROC)SDL_GL_GetProcAddress("glLinkProgram");
+        glValidateProgram = (PFNGLVALIDATEPROGRAMPROC)SDL_GL_GetProcAddress("glValidateProgram");
+        glGetProgramiv = (PFNGLGETPROGRAMIVPROC)SDL_GL_GetProcAddress("glGetProgramiv");
+        glGetProgramInfoLog = (PFNGLGETPROGRAMINFOLOGPROC)SDL_GL_GetProcAddress("glGetProgramInfoLog");
+        glUseProgram = (PFNGLUSEPROGRAMPROC)SDL_GL_GetProcAddress("glUseProgram");
+        glGetUniformLocation = (PFNGLGETUNIFORMLOCATIONPROC)SDL_GL_GetProcAddress("glGetUniformLocation");
+
+        return glCreateShader && glShaderSource && glCompileShader && glGetShaderiv && 
+            glGetShaderInfoLog && glDeleteShader && glAttachShader && glCreateProgram &&
+            glDeleteProgram && glLinkProgram && glValidateProgram && glGetProgramiv &&
+            glGetProgramInfoLog && glUseProgram && glGetUniformLocation;
+    }
+
+    #endif
+
+    GLuint compileShader(const char* source, GLuint shaderType) {
+        // Create ID for shader
+        GLuint result = glCreateShader(shaderType);
+        // Add define depending on shader type
+        const char *sources[2] = { shaderType==GL_VERTEX_SHADER?"#define VERTEX\n":"#define FRAGMENT\n", source };
+        // Define shader text
+        glShaderSource(result, 2, sources, NULL);
+        // Compile shader
+        glCompileShader(result);
+
+        //Check vertex shader for errors
+        GLint shaderCompiled = GL_FALSE;
+        glGetShaderiv( result, GL_COMPILE_STATUS, &shaderCompiled );
+        if (shaderCompiled != GL_TRUE)
+        {
+            std::cout << "Error en la compilación: " << result << "!" << std::endl;
+            GLint logLength;
+            glGetShaderiv(result, GL_INFO_LOG_LENGTH, &logLength);
+            if (logLength > 0)
+            {
+                GLchar *log = (GLchar*)malloc(logLength);
+                glGetShaderInfoLog(result, logLength, &logLength, log);
+                std::cout << "Shader compile log:" << log << std::endl;
+                //std::cout << source << std::endl;
+                free(log);
+            }
+            glDeleteShader(result);
+            result = 0;
+        }
+        return result;
+    }
+
+    GLuint compileProgram(const char* vertexShaderSource, const char* fragmentShaderSource)
+    {
+        GLuint programId = 0;
+        GLuint vtxShaderId, fragShaderId;
+
+        if (programId != 0) glDeleteProgram(programId);
+        programId = glCreateProgram();
+        
+
+        vtxShaderId = compileShader(vertexShaderSource, GL_VERTEX_SHADER);
+        fragShaderId = compileShader(fragmentShaderSource?fragmentShaderSource:vertexShaderSource, GL_FRAGMENT_SHADER);
+
+        if(vtxShaderId && fragShaderId)
+        {
+            // Associate shader with program
+            glAttachShader(programId, vtxShaderId);
+            glAttachShader(programId, fragShaderId);
+            glLinkProgram(programId);
+            glValidateProgram(programId);
+
+            // Check the status of the compile/link
+            GLint logLen;
+            glGetProgramiv(programId, GL_INFO_LOG_LENGTH, &logLen);
+            if (logLen > 0)
+            {
+                char* log = (char*) malloc(logLen * sizeof(char));
+                // Show any errors as appropriate
+                glGetProgramInfoLog(programId, logLen, &logLen, log);
+                std::cout << "Prog Info Log: " << std::endl << log << std::endl;
+                free(log);
+            }
+        }
+        if (vtxShaderId) glDeleteShader(vtxShaderId);
+        if (fragShaderId) glDeleteShader(fragShaderId);
+        return programId;
+    }
+
+    const bool init(SDL_Window* win, SDL_Texture* backBuffer, const char* vertexShader, const char* fragmentShader)
+    {
+        shader::win = win;
+        shader::renderer = SDL_GetRenderer(win);
+        shader::backBuffer = backBuffer;
+        int w, h;
+        SDL_GetWindowSize(win, &w, &h);
+
+        if (w * aspect_ratio > h)  {
+            window.y = 0;
+            window.h = h;
+            window.w = h/aspect_ratio;
+            window.x = (w - window.w)/2;
+        } else {
+            window.x = 0;
+            window.w = w;
+            window.h = w*aspect_ratio;
+            window.y = (h - window.h)/2;
+        }
+
+        SDL_GetTextureSize(backBuffer, &tex_size.x, &tex_size.y);
+        printf("tex size: %fx%f\n", tex_size.x, tex_size.y);
+        SDL_PropertiesID props = SDL_GetTextureProperties(backBuffer);
+        texture_number = SDL_GetNumberProperty(props, SDL_PROP_TEXTURE_OPENGL_TEXTURE_NUMBER, -1);
+        printf("texture number: %i\n", texture_number);
+        int access = SDL_GetNumberProperty(props, SDL_PROP_TEXTURE_ACCESS_NUMBER, -1);
+        nose = SDL_GetNumberProperty(props, SDL_PROP_TEXTURE_OPENGL_TEXTURE_TARGET_NUMBER, -1);
+        printf("texture target number: %i\n", nose);
+
+        if (access != SDL_TEXTUREACCESS_TARGET)
+        {
+            std::cout << "ERROR FATAL: La textura per al render ha de tindre SDL_TEXTUREACCESS_TARGET definit." << std::endl;
+            exit(1);
+        }
+
+        const char * renderer_name = SDL_GetRendererName(renderer);
+        printf("rendererInfo.name: %s\n", renderer_name);
+
+        if(!strncmp(renderer_name, "opengl", 6)) {
+#ifndef __APPLE__
+            static bool gl_extensions_initialized = false;
+            if (!gl_extensions_initialized) {
+                if (!initGLExtensions()) {
+                    std::cout << "WARNING: No s'han pogut inicialitzar les extensions d'OpenGL!" << std::endl;
+                    can_use_opengl = false;
+                    return false;
+                }
+                gl_extensions_initialized = true;
+            }
+#endif
+            // Compilar el shader y dejarlo listo para usar.
+            if (!vertexShader) {
+                can_use_opengl = false;
+                return false;
+            }
+            programId = compileProgram(vertexShader, fragmentShader);
+        } else {
+            std::cout << "WARNING: El driver del renderer no es OpenGL." << std::endl;
+            can_use_opengl = false;
+            return false;
+        }
+        can_use_opengl = true;
+        return true;
+    }
+
+    unsigned char pixels[512*240*4];
+
+    void enable() { if (can_use_opengl) using_opengl = true; }
+    void disable() { using_opengl = false; }
+
+    void setAspectRatio(const float ratio)
+    {
+        aspect_ratio = ratio;
+    }
+
+    void render()
+    {
+        SDL_FlushRenderer(renderer);
+        SDL_SetRenderTarget(renderer, NULL);
+        SDL_SetRenderDrawColor(renderer, 0, 0, 0, 255);
+        SDL_RenderClear(renderer);
+        SDL_FlushRenderer(renderer);
+
+        if (using_opengl)
+        {
+            GLint oldProgramId;
+            if (programId != 0)
+            {
+                glGetIntegerv(GL_CURRENT_PROGRAM, &oldProgramId);
+                glUseProgram(programId);
+            }
+
+            glEnable(GL_TEXTURE_2D);
+            glActiveTexture(GL_TEXTURE0);
+            glBindTexture(GL_TEXTURE_2D, 1);
+            //glGetTexImage(GL_TEXTURE_2D, 0, GL_BGRA, GL_UNSIGNED_INT_8_8_8_8, pixels);
+            //if (glGetError()) { printf("GLGETERROR!\n"); exit(1);}
+            //GLint param;
+            //glGetTexLevelParameteriv(GL_TEXTURE_2D, 0, GL_TEXTURE_HEIGHT, &param);
+            //printf("tex width: %i\n", param);
+            glViewport(window.x, window.y, window.w, window.h);
+            
+            glBegin(GL_TRIANGLE_STRIP);
+                glTexCoord2f(0.0f, 0.0f);
+                glVertex2f(-1.0f, -1.0f);
+                glTexCoord2f(tex_size.x, 0.0f);
+                glVertex2f(1.0f, -1.0f);
+                glTexCoord2f(0.0f, tex_size.y);
+                glVertex2f(-1.0f, 1.0f);
+                glTexCoord2f(tex_size.x, tex_size.y);
+                glVertex2f(1.0f, 1.0f);
+            glEnd();
+
+            SDL_GL_SwapWindow(win);
+
+            if (programId != 0) glUseProgram(oldProgramId);
+
+        } else {
+            SDL_RenderTexture(renderer, backBuffer, NULL, &window);
+            SDL_RenderPresent(renderer);
+        }
+        if (glGetError()) { printf("GLERROR!\n"); exit(1); }
+    }
+}
diff --git a/source/jshader.h b/source/jshader.h
new file mode 100644
index 0000000..7f19608
--- /dev/null
+++ b/source/jshader.h
@@ -0,0 +1,48 @@
+#pragma once
+
+#include <SDL3/SDL.h>
+
+// TIPS:
+// =======================================================================
+// Abans de crear el renderer, cridar a la següent funció:
+//
+//   SDL_SetHint(SDL_HINT_RENDER_DRIVER, "opengl");
+//
+// Aixó li diu que volem un renderer que use especificament opengl. A més,
+// al crear el renderer li tenim que dir que el volem que use acceeració
+// per hardware, i que soporte render a textura. Per exemple:
+//
+//   SDL_Renderer *ren = SDL_CreateRenderer(win, -1, SDL_RENDERER_ACCELERATED |
+//                                                   SDL_RENDERER_TARGETTEXTURE);
+//
+// Per altra part, al crear la textura tenim que definir que puga ser target
+// de renderitzat (SDL_TEXTUREACCESS_TARGET), per exemple:
+//
+// 	 SDL_Texture *tex = SDL_CreateTexture(renderer, SDL_PIXELFORMAT_ARGB8888,
+//		                                  SDL_TEXTUREACCESS_TARGET, 320, 240);
+//
+// Els shaders li'ls passem com una cadena, som nosaltres els que s'encarreguem
+// de carregarlos de disc, amb fopen, ifstream, jfile o el que vullgues.
+// Si els tens en un std::string, passa-li-la com "cadena.c_str()".
+// 
+// Poden ser els dos el mateix arxiu, com fa libRetro, jo desde dins ja fique
+// els defines necessaris. Si es el mateix arxiu, pots no ficar el quart paràmetre.
+//
+// Els shaders de libRetro no funcionen directament, hi ha que fer algunes modificacions.
+//
+// El pintat final de la teua escena l'has de fer com si "backBuffer" fora la pantalla.
+//
+// Ah! una cosa mes: al compilar, en Linux afegir "-lGL", en Windows afegir "-lopengl32".
+// En Mac ni idea
+
+namespace shader
+{
+    const bool init(SDL_Window* win, SDL_Texture* backBuffer,
+                    const char* vertexShader, const char* fragmentShader=nullptr);
+
+    void setAspectRatio(const float ratio);
+    void enable();
+    void disable();
+
+    void render();
+}
diff --git a/source/main.cpp b/source/main.cpp
index 0df75bf..57c1d99 100644
--- a/source/main.cpp
+++ b/source/main.cpp
@@ -4,12 +4,12 @@
 
 void game::init()
 {
-    draw::init("Arounders", 320, 200, 3);
+    draw::init("Arounders", 320, 200, 3, false, 3.0f/4.0f);
+    draw::setShader("lynx.glsl");
     draw::setTrans(0);
-
-    input::init(3);
     audio::init(48000, SDL_AUDIO_S16, 2);
-    
+
+    file::setConfigFolder("arounders");
     font::init();
     
     game::setUpdateTicks(16);