diff --git a/bin/back b/bin/back
index b7adaad..444ac9b 100755
Binary files a/bin/back and b/bin/back differ
diff --git a/obj/base.o b/obj/base.o
index 79a5fbb..eb81a7c 100644
Binary files a/obj/base.o and b/obj/base.o differ
diff --git a/obj/main.o b/obj/main.o
index f3b875c..1a6d7a8 100644
Binary files a/obj/main.o and b/obj/main.o differ
diff --git a/obj/menus.o b/obj/menus.o
index 2336bef..b18dbf2 100644
Binary files a/obj/menus.o and b/obj/menus.o differ
diff --git a/src/base.c b/src/base.c
index 2d0a717..cd2166a 100644
--- a/src/base.c
+++ b/src/base.c
@@ -63,6 +63,20 @@ int max(int a, int b) {
     return a;
 }
 
+float minf(float a, float b) {
+    if(a > b) {
+        return b;
+    };
+    return a;
+}
+
+float maxf(float a, float b) {
+    if(a < b) {
+        return b;
+    };
+    return a;
+}
+
 double mind(double a, double b) {
     if(a > b) {
         return b;
diff --git a/src/base.h b/src/base.h
index 456b83c..8f6f77a 100644
--- a/src/base.h
+++ b/src/base.h
@@ -9,6 +9,8 @@ int min(int a, int b);
 int max(int a, int b);
 double mind(double a, double b);
 double maxd(double a, double b);
+float minf(float a, float b);
+float maxf(float a, float b);
 double absf(double n);
 int convex_seg(int x1, int x2, double theta);
 double convex_tri(double a, double tha, double b, double thb, double c, double thc);
diff --git a/src/main.c b/src/main.c
index ed234a7..47c1729 100644
--- a/src/main.c
+++ b/src/main.c
@@ -29,7 +29,7 @@ double jPress = false;
 double gPress = false;
 double rPress = false;
 
-void reset_everything(char* folder) {
+void reset_everything(int count, char* folder) {
     hashtbl_free(visited);
     free_proj();
     free_interf();
@@ -40,7 +40,7 @@ void reset_everything(char* folder) {
     init_ent_generator(10);
     init_proj();
     init_interf();
-    parse_rooms(1, folder);
+    parse_rooms(count, folder);
 }
 
 void processInput(GLFWwindow *window, float dtime) {
@@ -174,11 +174,11 @@ void processInput(GLFWwindow *window, float dtime) {
     if(glfwGetKey(window, GLFW_KEY_R) == GLFW_PRESS) {
         if(!rPress) {
             rPress = true;
-            reset_everything("levels/level_00/");
+            reset_everything(7, "templates/");
         }   
-    } else {
+    }/*else {
         rPress = false;
-    }
+    }*/
 }
 
 const char *vertexShaderSource = "#version 330 core\n"
@@ -412,19 +412,20 @@ int main_alt() {
         gl_drawInteger(shaderProgramR, triCount, 0.0f, 0.92f, 0.04f, 128, 128, 128, 0.005f, 1);
         gl_drawData(shaderProgramR);
 
-        // glfw: swap buffers and poll IO events (keys pressed/released, mouse moved etc.)
-        // -------------------------------------------------------------------------------
-        processInput(window, delta);
-        if(gamemode == 0) {
-            movePlayerG(delta);
+        if(!isInMenu(shaderProgramR)) {
+            processInput(window, delta);
+            if(gamemode == 0) {
+                movePlayerG(delta);
+            }
+            teleport_on_edge();
+            update_entities(delta);
+            updateProj(delta);
         }
-        teleport_on_edge();
-        update_entities(delta);
-        updateProj(delta);
 
         usleep(max(0, interval-(int)(1000000*delta)));
         sim_time += deltad;
 
+        // glfw: swap buffers and poll IO events (keys pressed/released, mouse moved etc.)
         glfwSwapBuffers(window);
         glfwPollEvents();
 
diff --git a/src/menus.c b/src/menus.c
index b6b4ae6..94a7f6c 100644
--- a/src/menus.c
+++ b/src/menus.c
@@ -10,7 +10,7 @@
 #include <time.h>
 #include <glad/glad.h>
 #include "../include/glad/glad.h"
-//#include <GLFW/glfw3.h>
+#include <GLFW/glfw3.h>
 #include <cglm/cglm.h>
 
 #include "hash.h"
@@ -106,6 +106,7 @@ void gl_drawDigit(unsigned int fragShader, int n, float x, float y, float size,
 }
 
 // 7-segment display
+// y is the middle of the text
 // side can be -1 (aligned right) or 1 (aligned left)
 void gl_drawInteger(unsigned int fragShader, int n, float x, float y, float size, int r, int g, int b, float width, int side) {
     int left = n;
@@ -277,6 +278,7 @@ int get_string_len(char* s) {
 }
 
 // 7-segment display
+// y is the middle of the text
 // side can be -1 (aligned right) or 1 (aligned left)
 void gl_drawString(unsigned int fragShader, char* str, float x, float y, float size, int r, int g, int b, float width, int side) {
     float curx = x;
@@ -343,15 +345,232 @@ void gl_initDrawRect(unsigned int shaderProgram) {
     glUseProgram(shaderProgram);
 }
 
+// ------------------------------------------------------------------------------------------------------------------------------------------------ //
+
 static onoff_button* buttonList;
 static interface* interfaceList;
 
+static int MAX_BUTTON_SIZE = 1024;
+static int MAX_INTERFACE_SIZE = 192;
+
+static int bListId;
+static int intListId;
+
+static int* current_interface = NULL;
+
+void display_button(int but_id, unsigned int fragShader) {
+    if(but_id < 0 || but_id > bListId) {
+        fprintf(stderr, "ERROR : attempting to display a non-existing button (%d)\n", but_id);
+    } else {
+        float size = minf(buttonList[but_id].h/2.1f, (buttonList[but_id].w)/get_string_len(buttonList[but_id].text));
+        gl_drawRect(fragShader, buttonList[but_id].x, buttonList[but_id].y, buttonList[but_id].w, buttonList[but_id].h, buttonList[but_id].red, buttonList[but_id].green, buttonList[but_id].blue);
+        gl_drawString(fragShader, buttonList[but_id].text, buttonList[but_id].x+(size+size/10.0f)/2.0f, buttonList[but_id].y+buttonList[but_id].h/2.0f, size, 255-buttonList[but_id].red, 255-buttonList[but_id].green, 255-buttonList[but_id].blue, size/10.0f, 1);
+
+    }
+}
+
+void display_interface(int int_id, unsigned int fragShader) {
+    if(int_id < 0 || int_id > intListId) {
+        fprintf(stderr, "ERROR : attempting to display a non-existing interface (%d)\n", int_id);
+    } else {
+        float size = minf(interfaceList[int_id].h/2.1f, (interfaceList[int_id].w)/get_string_len(interfaceList[int_id].title));
+        gl_drawRect(fragShader, interfaceList[int_id].x, interfaceList[int_id].y, interfaceList[int_id].w, interfaceList[int_id].h, interfaceList[int_id].red, interfaceList[int_id].green, interfaceList[int_id].blue);
+        gl_drawString(fragShader, interfaceList[int_id].title, interfaceList[int_id].x+(size+size/10.0f)/2.0f, interfaceList[int_id].y+interfaceList[int_id].h/2.0f, size, 255-interfaceList[int_id].red, 255-interfaceList[int_id].green, 255-interfaceList[int_id].blue, size/10.0f, 1);
+    
+        for(int k = 0; k < interfaceList[int_id].nButtons; k++) {
+            display_button(interfaceList[int_id].buttons[k], fragShader);
+        }
+    }
+}
+
+bool is_button_pressed(int but_id, float mx, float my) {
+    if(but_id < 0 || but_id > bListId) {
+        fprintf(stderr, "ERROR : attempting to update a non-existing button (%d)\n", but_id);
+        return false;
+    } else {
+        return (mx >= buttonList[but_id].x && my >= buttonList[but_id].y && mx <= buttonList[but_id].x+buttonList[but_id].w && my <= buttonList[but_id].y+buttonList[but_id].h);
+    }
+}
+
+void menu_actions(int int_id) {
+    if(int_id < 0 || int_id > intListId) {
+        fprintf(stderr, "ERROR : attempting to update a non-existing interface (%d)\n", int_id);
+    } else if(false /* TODO : mouse is clicked */) {
+        float mx = 0.0f;
+        float my = 0.0f;
+        /* TODO : get mouse position and state */
+        for(int k = 0; k < interfaceList[int_id].nButtons; k++) {
+            if(is_button_pressed(interfaceList[int_id].buttons[k], mx, my)) {
+                switch (buttonList[interfaceList[int_id].buttons[k]].type) {
+                case WARP:
+                    *current_interface = *buttonList[interfaceList[int_id].buttons[k]].metadata;
+                    break;
+                case SET_VAR:
+                    /* TODO */
+                    break;
+                case EXIT:
+                    current_interface = NULL;
+                    break;
+                
+                default:
+                    break;
+                }
+            }
+        }
+    }
+}
+
+bool isInMenu(unsigned int fragShader) {
+    if(current_interface == NULL) {
+        return false;
+    } else {
+        display_interface(*current_interface, fragShader);
+        menu_actions(*current_interface);
+        return true;
+    }
+}
+
 void init_interf() {
-    buttonList = malloc(sizeof(onoff_button)*256);
-    interfaceList = malloc(sizeof(interface)*64);
+    buttonList = malloc(sizeof(onoff_button)*MAX_BUTTON_SIZE);
+    for(int k = 0; k < MAX_BUTTON_SIZE; k++) {
+        buttonList[k].id = -1;
+    }
+    interfaceList = malloc(sizeof(interface)*MAX_INTERFACE_SIZE);
+    for(int k = 0; k < MAX_INTERFACE_SIZE; k++) {
+        interfaceList[k].intfid = -1;
+    }
+    bListId = 0;
+    intListId = 0;
+}
+
+// returns the ID of the new button (-1 if error)
+int button_create_onoff(char* text, int red, int green, int blue, float x, float y, float w, float h, button_action actn, int* val) {
+    if(bListId < MAX_BUTTON_SIZE) {
+
+        buttonList[bListId].id = bListId;
+        buttonList[bListId].text = text;
+        buttonList[bListId].red = red;
+        buttonList[bListId].green = green;
+        buttonList[bListId].blue = blue;
+
+        buttonList[bListId].x = x;
+        buttonList[bListId].y = y;
+        buttonList[bListId].w = w;
+        buttonList[bListId].h = h;
+
+        buttonList[bListId].type = actn;
+        buttonList[bListId].metadata = val;
+
+        bListId += 1;
+        return (bListId-1);
+    } else {
+        return -1;
+    }
+}
+
+// returns the ID of the new interface (-1 if error)
+int interface_create(char* title, int red, int green, int blue, float x, float y, float w, float h) {
+    if(intListId < MAX_INTERFACE_SIZE) {
+        interfaceList[intListId].intfid = intListId;
+
+        interfaceList[intListId].title = title;
+        interfaceList[intListId].red = red;
+        interfaceList[intListId].green = green;
+        interfaceList[intListId].blue = blue;
+
+        interfaceList[intListId].x = x;
+        interfaceList[intListId].y = y;
+        interfaceList[intListId].w = w;
+        interfaceList[intListId].h = h;
+
+        interfaceList[intListId].buttons = malloc(sizeof(int*)*16);
+        interfaceList[intListId].nButtons = 0;
+        interfaceList[intListId].nMemButtons = 16;
+
+        intListId += 1;
+        return (intListId-1);
+    } else {
+        return -1;
+    }
+}
+
+void interface_link_button(int interface_id, int button_id) {
+    if(interface_id < 0 || interface_id >= intListId) {
+        fprintf(stderr, "ERROR : attempting to link non-existing interface (%d)\n", interface_id);
+    } else if(button_id < 0 || button_id >= bListId) {
+        fprintf(stderr, "ERROR : attempting to link non-existing button (%d)\n", button_id);
+    } else {
+        if(interfaceList[interface_id].nMemButtons == interfaceList[interface_id].nButtons) {
+            int* newI = malloc(sizeof(int)*2*interfaceList[interface_id].nMemButtons);
+            for(int k = 0; k < interfaceList[interface_id].nMemButtons; k++) {
+                newI[k] = interfaceList[interface_id].buttons[k];
+            }
+            free(interfaceList[interface_id].buttons);
+            interfaceList[interface_id].buttons = newI;
+            interfaceList[interface_id].nMemButtons *= 2;
+        }
+        interfaceList[interface_id].buttons[interfaceList[interface_id].nButtons] = button_id;
+        interfaceList[interface_id].nButtons += 1;
+    }
+}
+
+void interface_unlink_button(int interface_id, int button_id) {
+    if(interface_id < 0 || interface_id >= intListId) {
+        fprintf(stderr, "ERROR : attempting to unlink non-existing interface (%d)\n", interface_id);
+    } else if(button_id < 0 || button_id >= bListId) {
+        fprintf(stderr, "ERROR : attempting to unlink non-existing button (%d)\n", button_id);
+    } else {
+        int not_found = 1;
+        for(int k = 0; k < not_found*interfaceList[interface_id].nButtons; k++) {
+            if(interfaceList[interface_id].buttons[k] == button_id) {
+                not_found = 0;
+                interfaceList[interface_id].buttons[k] = interfaceList[interface_id].buttons[interfaceList[interface_id].nButtons-1];
+                interfaceList[interface_id].nButtons -= 1;
+            }
+            if(not_found) {
+                fprintf(stderr, "WARNING : interface %d does not link to buttton %d\n", interface_id, button_id);
+            }
+        }
+    }
+}
+
+void interface_set(int interface_id) {
+    *current_interface = interface_id;
 }
 
 void free_interf() {
     free(buttonList);
     free(interfaceList);
-}
\ No newline at end of file
+}
+
+/*
+typedef struct onoff_button {
+    int id;
+
+    char* text;
+    float x; float y; float w; float h;
+    int red;
+    int green;
+    int blue;
+
+    // {WARP, SET_VAR}
+    button_action type;
+    
+    // the value to change (if SET_VAR) or the destination interface (if WARP)
+    int* metadata;
+} onoff_button;
+
+typedef struct interface {
+    int intfid;
+
+    char* title;
+    float x; float y; float w; float h;
+    int red;
+    int green;
+    int blue;
+
+    int* buttons;
+    int nButtons;
+    int nMemButtons;
+} interface;
+*/
\ No newline at end of file
diff --git a/src/menus.h b/src/menus.h
index c3a9845..8228be4 100644
--- a/src/menus.h
+++ b/src/menus.h
@@ -1,18 +1,16 @@
 #ifndef MENUS_H
 #define MENUS_H
 
-typedef enum button_action {WARP, SET_VAR} button_action ;
+typedef enum button_action {WARP, SET_VAR, EXIT} button_action ;
 
 typedef struct onoff_button {
     int id;
 
     char* text;
-    double x; double y; double w; double h;
-    int red;
-    int green;
-    int blue;
+    float x; float y; float w; float h;
+    int red; int green; int blue;
 
-    // {WARP, SET_VAR}
+    // {WARP, SET_VAR, EXIT}
     button_action type;
     
     // the value to change (if SET_VAR) or the destination interface (if WARP)
@@ -23,9 +21,12 @@ typedef struct interface {
     int intfid;
 
     char* title;
+    float x; float y; float w; float h;
+    int red; int green; int blue;
 
-    onoff_button* buttons;
-    int nbuttons;
+    int* buttons;
+    int nButtons;
+    int nMemButtons;
 } interface;
 
 void initMenus();
@@ -38,6 +39,15 @@ void gl_drawString(unsigned int fragShader, char* str, float x, float y, float s
 void gl_printf(unsigned int fragShader, float x, float y, float size, float width, int r, int g, int b, const char* str, ...);
 
 void init_interf();
+
+bool isInMenu(unsigned int fragShader);
+
+int button_create_onoff(char* text, int red, int green, int blue, float x, float y, float w, float h, button_action actn, int* val);
+int interface_create(char* title, int red, int green, int blue, float x, float y, float w, float h);
+void interface_link_button(int interface_id, int button_id);
+void interface_unlink_button(int interface_id, int button_id);
+void interface_set(int interface_id);
+
 void free_interf();
 
 #endif
\ No newline at end of file