Merge main, change compile.bat, add struct gui

Muy bien!!, nada mas habian 2 errores por mi parte,
'Normal' no estaba normalizado, lo que afectaba las potencias con 'pow'.
Ademas habia un error con los buffers del shader lo que afectaba toda la iluminacion.
Sin embargo lo hiciste muy bien, solo que te falto definir viewPos.

.clang-format

@@ -0,0 +1,19 @@
+---
+PointerAlignment: Right
+AllowShortBlocksOnASingleLine: Never
+
+UseTab: Always
+IndentWidth: 4
+TabWidth: 4
+ColumnLimit: 80
+
+AlignAfterOpenBracket: false
+AlignOperands: AlignAfterOperator
+AlwaysBreakBeforeMultilineStrings: true
+
+BreakBeforeBraces: Allman
+BreakStringLiterals: true
+IndentCaseLabels: false
+IndentGotoLabels: false
+InsertBraces: false
+...

.gitignore

@@ -0,0 +1,5 @@
+manigraph
+**.o
+**.so
+**.exe
+**.dll

.gitmodules

@@ -4,3 +4,6 @@
 [submodule "ext/glfw"]
 	path = ext/glfw
 	url = https://github.com/glfw/glfw
+[submodule "ext/nuklear"]
+	path = ext/nuklear
+	url = https://github.com/Immediate-Mode-UI/Nuklear

Makefile

@@ -1,64 +1,81 @@
 BIN = manigraph
 
 OBJ = \
+	ext/glad/glad.o \
 	src/context.o \
-	src/texture.o \
 	src/window.o \
-	src/matrix.o \
 	src/shader.o \
+	src/klein.o \
 	src/input.o \
+	src/load.o \
 	src/mesh.o \
-	src/alan.o \
+	src/gui.o \
 	src/main.o 
 
+EXAMPLES = \
+	example/basic \
+	example/riemman \
+	example/n-cube \
+	example/n-hilbert-cube \
+	example/lens
+
 CFLAGS = \
 	-I./ext/cglm/include  \
 	-I./ext/glfw/include  \
-	-Wall -Wno-unused-function -std=c99   \
+	-I./ext/glad  \
+	-I./ext/nuklear  \
+	-I./include  \
+	-Wall -Wno-unused-function -std=c99 -D_GNU_SOURCE \
 
 help:
-	@echo "Para compilar el proyecto a tu sistema operativo"
+	@echo "Usage:"
-	@echo "porfavor usa uno de los siguientes comandos:"
 	@echo "	$(MAKE) windows"
 	@echo "	$(MAKE) linux-x11"
 	@echo "	$(MAKE) linux-wayland"
 	@echo "	$(MAKE) cocoa"
-	@echo "Para limpiar los archivos compilados se puede usar"
+	@echo "	$(MAKE) CC=emcc wasm"
+	@echo "Examples"
+	@echo "	$(MAKE) examples"
+	@echo "Clean"
 	@echo "	$(MAKE) clean"
-	@echo "Para ejecturar el programa sin instalarlos se puede usar:"
-	@echo "	$(MAKE) run-linux"
 
-# WINDOWS
+src/main.o: src/data/shaders.h
-windows: $(OBJ) glfw.dll
+
-	$(CC) $(CFLAGS) $(OBJ) -o $(BIN) -L. -lglfw -lopengl32 -lglew32 
+windows: $(OBJ) 
+	cd ext; $(MAKE) -f glfw.mk windows; cd -
+	$(CC) $(CFLAGS) $(OBJ) -o $(BIN) -L. -lglfw -lopengl32 
 
 glfw.dll:
 	$(CC) -fPIC -shared -D_GLFW_WIN32 -D_GLFW_BUILD_DLL ./ext/glfw/src/*.c -o $@ -lgdi32 
 
 # LINUX
-linux-x11: $(OBJ)
-	$(MAKE) BKN=_GLFW_X11 libglfw.so
-	$(CC) -o $(BIN) $(OBJ) -L. -lGLEW -lGL -lglfw 
-
 linux-wayland: $(OBJ)
-	$(MAKE) BKN=_GLFW_WAYLAND libglfw.so
+	cd ext; $(MAKE) -f glfw.mk linux-wayland; cd -
-	$(CC) -o $(BIN) $(OBJ) -L. -lGLEW -lGL -lglfw 
+	$(CC) -o $(BIN) $(OBJ) ext/libglfw.a -lm
 
-run-linux:
+linux-x11: $(OBJ)
-	LD_LIBRARY_PATH=. ./$(BIN)
+	cd ext; $(MAKE) -f glfw.mk linux-x11; cd -
+	$(CC) -o $(BIN) $(OBJ) ext/libglfw.a -lm 
 
-# COCOA
 cocoa: $(OBJ)
-	$(MAKE) BKN=_GLFW_COCOA libglfw.so
+	cd ext; $(MAKE) -f glfw.mk cocoa; cd -
-	$(CC) -framework OpenGL -o $(BIN) $(OBJ) -L. -lGLEW -lGL -lglfw
+	$(CC) -framework OpenGL -o $(BIN) $(OBJ) ext/glfw.a -lGL -lglfw 
 
-libglfw.so:
+wasm: $(OBJ)
-	$(CC) -fPIC -shared -D$(BKN) -D_GLFW_BUILD_DLL ./ext/glfw/src/*.c -o $@ 
+	$(CC) -sUSE_WEBGL2=1 -sUSE_GLFW=3 -o $(BIN).html $(OBJ)
+	chmod -x $(BIN).wasm
 
 clean:
-	rm $(OBJ) $(BIN)
+	rm $(OBJ) $(BIN) $(EXAMPLES)
+	cd ext; $(MAKE) -f glfw.mk clean; cd -
+
+
+examples: $(EXAMPLES)
 
 .SUFFIXES: .c .o 
 
 .c.o:
-	$(CC) $(CFLAGS) -c -o $@ $<
+	$(CC) -Wno-implicit-function-declaration $(CFLAGS) -c -o $@ $<
+
+.c:
+	$(CC) -I include  -o $@ $< -lm

README.md

@@ -1,92 +1,62 @@
-# Manigraph: Graficadora de variedades
+# Manigraph
-Diaz Camacho Pedro Emilio
+Manigraph is a cutting-edge tool for multidimentional surface visualization,
+capable of handling over a hundred dimensions. It allows users to interactively
+explore each dimension in an intuitive and dynamic way. 
+Import your .klein files, which represents multidimentional surface.
 
-# Resumen
+# Building
-manigraph es un graficador interactiva de variedades que lee archivos binarios, con la información de
+Manigraph is written in C99, and uses OpenGL 2.0 for the rendering. So you just
-una variedad multidimensional y grafica esta variedad en una proyección tridimensional.
+need a C compiler to build this project.
 
-# Dependencias
+## Source code
-Para poder compilar el proyecto hace falta lo siguiente.
-## Programas
-- `cc`: Cualquier compilador de C.
-- `git`: Gestor de dependencias. (Opcional)
-- `make`: Herramienta para compilar automáticamente. (Opcional) 
-
-## Librerías
-- `openGL`: A cross-platform API for rendering 2D and 3D graphics. (no incluida)
-- `glew`: The OpenGL Extension Wrangler Library (no incluida)
-- `glfw`: A multi-platform library for OpenGL, OpenGL ES, Vulkan, window and input.
-- `cglm`: Highly Optimized 2D / 3D Graphics Math (glm) for C.
-### Linux
-Para compilar `glfw` en linux hacen falta las siguientes librerías según el caso. (no incluidas)
-- `x11`: libXcursor-devel libXi-devel libXinerama-devel libXrandr-devel
-- `wayland`: libwayland-dev libxkbcommon-dev wayland-protocols
-
-# Descargas
-- [git](https://git-scm.com/downloads/win)
-- [MinGW](https://github.com/niXman/mingw-builds-binaries/releases)
-- [glew](https://glew.sourceforge.net/)
-
-# Clonar el código fuente
 ```
-git clone https://gitea.adles.top/software/manigraph.git
+git clone https://gitea.axiolutions.top/software/manigraph.git
 cd manigraph
 git submodule update --init --recursive
 ```
 
-# Compilación
+##  Dependecies
-Para compilar manualmente el proyecto se puede usar `make` o ejecutar los comandos manualmente
+You may need system specific dependecies to build *Manigraph*. 
-en el código fuente de `manigraph`.
+[Reference](https://www.glfw.org/docs/3.3/compile.html#compile_deps)
 
-## Make
+### Linux
-Los siguientes comandos sirven para compilar `manigraph` deacuerdo al sistema operativo.
+- `x11`: libXcursor-devel libXi-devel libXinerama-devel libXrandr-devel
+- `wayland`: libwayland-dev libxkbcommon-dev wayland-protocols
+
+## Commands
+A C compiler is needed for building *Manigraph*. and any of those commands
 
 ```
 make windows
+./compile.bat
 make linux-x11
 make linux-wayland
 make cocoa
+make CC=emcc wasm
 ```
 
-## Manualmente
+# Flow of Manigraph
-se pueden compilar el proyecto  manualmente sin necesidad del programa `make`.
+![Flow of Manigraph](doc/flow.svg)
 
-### GLFW
+# Design
-Si tienes problemas compilando `GLFW` puedes checar su página web oficial
+Manigraph is a program designed with sustainability in mind. It is built to be 
-explicando el tema: [Compiling GLFW](https://www.glfw.org/docs/3.3/compile.html).
+portable, resource-efficient, and easy to maintain and scale. The program 
+follows a Data-Oriented Programming (DOP) paradigm, where each file is 
+responsible for a specific data type and manages its own dependencies. Each 
+function is named after the file it resides in, ensuring a clear organization
+and structure.
 
-#### Windows
+The independence of data types allows for efficient scaling and maintenance. 
-```
+The main file is a special case in this design: it is responsible for combining
-cc -fPIC -shared -D_GLFW_WIN32 -D_GLFW_BUILD_DLL ./ext/glfw/src/*.c -o glfw.dll -lgdi32
+all the data types in a comprehensive manner, actng as the workflow of the program.
-```
 
-#### Linux
+# Contributing
-```
+Before commiting use `clang-format`, for coding style consistency. Your 
-cc -fPIC -shared -D_GLFW_X11 -D_GLFW_BUILD_DLL ./ext/glfw/src/*.c -o libglfw.so
+contribution must be whitin the design principles and the concept of Manigraph.
-cc -fPIC -shared -D_GLFW_WAYLAND -D_GLFW_BUILD_DLL ./ext/glfw/src/*.c -o libglfw.so
-```
 
-#### Mac
+The following diagram illustrates the relationships between files, showing how 
-```
+they are connected through dependencies. It also highlights the scenarios where
-cc -fPIC -shared -D_GLFW_COCOA -D_GLFW_BUILD_DLL ./ext/glfw/src/*.c -o libglfw.so
+files are not independent of one another,
-```
 
-### Manigraph
+![File layout](doc/file_layout.svg)
-#### Windows
-```
-cc -I ext/cglm/include/ -I ext/glfw/include/ src/*.c -o manigraph -L. -lglfw -lopengl32 -lglew32
-```
-#### Linux
-```
-cc -I ext/cglm/include/ -I ext/glfw/include/ src/*.c -o manigraph -L. -lglfw -lGL -lGLEW
-```
-#### Mac
-```
-cc -framework GL -I ext/cglm/include/ -I ext/glfw/include/ src/*.c -o manigraph -L. -lglfw -lGLEW
-```
 
-# Ejecutar
-En linux se puede ejecutar el programa sin instalar la libreria de glfw usando:
-```
-LD_LIBRARY_PATH=. ./manigraph
-```

compile.bat

@@ -0,0 +1,3 @@
+:: git submodule update --init --recursive
+:: gcc -fPIC -shared -Iext/glfw/deps/MinGW -D_GLFW_WIN32 -D_GLFW_BUILD_DLL ./ext/glfw/src/*.c -o  glfw.dll -lgdi32
+gcc -I ext/glad -I ext/cglm/include -I ext/nuklear -I ext/glfw/include src/*.c ext/glad/glad.c -o manigraph -L . -lglfw -lopengl32

doc/es/dev/estructura-archivos.md

@@ -1,80 +0,0 @@
-# Estructura de archivos
-Díaz Camacho Pedro Emilio
-
-# Headers
-## main.h
-Este archivo incluye los prototipos internos, que va a usar el programa
-funge como api interna para los desarrolladores y debe estar bien documentada.
-
-# codigo fuente
-
-## main.c
-Este archivo debe configurar el programa antes de iniciarse, avisar de los problemas
-que eviten que el programa se ejecute correctamente, iniciar y terminar los objetos que use el
-programa, así como ejecutar la función principal
-### Depende de
-- <GL/gl.h>
-
-## context.c
-En este archivo se escoge un color para limpiar la pantalla y tiene una función para limpiar
-tanto lo dibujado en pantalla, como distintos buffers gráficos.
-### Depende de
-- <GL/gl.h>
-
-## input.c
-Incluye la función `poll_input`, que se ejecuta en cada ciclo del programa y devuelve un
-cuaternion de tipo `float *` que representa la rotación total del cubo, después de interactuar 
-con el programa.
-### Depende de
-- <GLFW/glfw3.h>
-- <cglm/quat.h>
-
-## matrix.c
-Incluye las funciónes para configurar y cargar en la GPU las 3 matrices principales.
-- `fix_matrix` esta matriz no cambia y se usa para configurar la perspectiva y la vista que
-va a usar el programa en todo momento.
-- `mdl_matrix` esta matriz depende de cada mesh y describe la rotación única de cada objeto,
-se usa para rotar los ejes ortogonamente con un indice.
-- `rot_matrix` esta matriz describe la rotación total de todos los objetos y se configura con
-un cuaternio
-### Depende de
-- <cglm/mat4.h>
-- <cglm/cam.h>
-- <cglm/quat.h>
-
-## mesh.c
-Este archivo se usa para crear, destruir y dibujar objetos de tipo `mesh`, un `mesh` es una
-colección de triángulos que describen un objeto multidimensional.
-### Depende de
-- <GL/gl.h>
-- <stdlib.h>
-
-## shader.c
-Debe crear, destruir y usar los shaders, estos shaders son programas para la gpu escritos en glsl para
-además aquí se carga memoria en gpu con las funciónes `gload_`
-### Depende de
-- <GL/gl.h>
-
-## texture.c
-Debe cargar, usar y destruir las texturas, que va a usar la gpu,  también crea una textura 
-para una paleta de colores definida, esto para manipular fácilmente los colores que usará el programa.
-### Depende de
-- <GL/gl.h>
-
-## window.c
-Crea, usa, limpie y cierra una ventana, una ventana tiene un contexto de OpenGL asociado para poder
-dibujar objetos en ella, tiene una función especial para avisar si la ventana está abierta para
-dibujar.
-### Depende de
-- <GLFW/glfw3.h>
-
-# Datos
-## data/cube.h
-Aquí esta la información del mesh de un cubo, este se va a borrar cuando podamos
-importar meshes para graficarlos.
-
-## data/axis.h
-Aquí está el mesh de un solo eje, este se va a rotar para hacer los otros 2 ejes.
-
-## data/shaders.h
-Aquí estan los shaders en glsl para dibujar en pantalla

doc/es/dev/tipos.md

@@ -1,43 +0,0 @@
-# Tipos de datos del proyecto
-Díaz Camacho Pedro Emilio
-
-# Introducción
-En este archivo vamos a detallar los tipos de datos únicos del programa, estos
-tipos de datos son estructuras que representan objetos computacionales y son
-necesarios para integrar las distintas partes del programa.
-
-## window_t
-En `window.c` tenemos una estructura que es la ventana y esta se representa por `window_t`,
-este tipo de dato es un pointer que es manejado por `glfw`.
-
-## id_t
-`id_t` es un tipo de dato que representa objetos de `OpenGL`, estos datos
-normalmente vienen enumerados, y en `manigraph` se usan para representar `shaders`, 
-`programs` y `texture`.
-
-## mesh_t
-Este es un tipo de dato usado para interactuar con `mesh.c`, este representa la triangulación de un
-objeto gráfico y funciona ocultando las variables que `OpenGL` necesita en un `void *`.
-
-## mat4_t
-`mat4_t` se usará para representar las matrices, se usará este tipo de dato exclusivamente
-en `matrix.c` y funcionará con el tipo de dato `mat4` de `cglm`.
-
-## quat_t
-Este tipo de dato sirve para representar un quaternio, este quaternio representa la rotación
-del objeto gráficado en la proyección tridimensional, y se usará para crear una matriz que
-pueda entender `glsl`.
-
-## narray
-`narray` es un tipo de dato que funciona como un `array` enumerado, esto significa que el primer
-elemento del `array` dice cuantos elementos tiene este, sin contar el primer elemento, y los demas elementos 
-funcionan como un `array` normal. 
-
-esta estructura nos ayuda a trabajar con arrays de tamaños arbitrario de forma óptima y sin tener que marcar el
-último elemento de forma especial.
-
-### narray_u8_t
-es un `narray` para `char` y `unsigned char`.
-### narray_float_t
-es un `narray` para `float`.
-

doc/es/tech/diseno.md

@@ -1,59 +0,0 @@
-# Manual de Diseño
-Diaz Camacho Pedro Emilio
-
-# Objetivos
-## Prioridad alta
-- [ ] El programa debe actualizarse cuando interactuan con el.
-- [ ] El usuario quiere:
-	- [X] Ver 3 ejes en todo momento.
-	- [ ] Ver que ejes esta viendo.
-	- [ ] Ver cuantos ejes hay.
-- [X] El usuario quiere:
-	- [X] Rotar estos ejes,
-	- [X] Ver donde quedan los ejes despues de la rotados.
-- [ ] El usuario experimentado quiere ejecutar el programa y pasar la variedad:
-	- [ ] Como argumento del programa.
-	- [ ] Desde la entrada estandar del programa.
-
-## Prioridad media
-
-- [ ] El usuario quiere:
-	- [ ] Cambiar los ejes que se ven por pares.
-	- [ ] Cambiar los ejes donde esta la informacion de los ejes.
-- [ ] El usuario quiere interactuar con el programa:
-	- [ ] Usando solo el mouse.
-	- [ ] Usando solo el teclado.
-
-## Prioridad baja
-- [ ] El usuario quiere guardar las transformaciones como un archivo GIF.
-
-# Camino
-
-0. Graficadora de un cubo.
-	1. Se hace un programa que muestre un cubo.
-	1. Se muestran los 3 ejes del cubo
-	1. Se rota el cubo en sus 3 ejes usando el teclado.
-	1. Se rota el cubo en sus 3 ejes usando el mouse.
-	1. Se muestran la etiqueta de los ejes.
-	1. Se hace el formato de objetos multidimensionales.
-0. Programa ejemplo
-	1. Se hace un programa que divida un cuadrado en triangulos.
-	1. Se mapea cada vertice del triangulo en un punto de la cinta de 
-	mobius usando una parametrizacion
-	1. Se mapea cada vertice del triangulo en un punto de la botella de
-		klein usando una parametrizacion
-	1. Se divide cada lado de un cubo de n dimensiones, en triangulos.
-
-0. Graficadora de variedades
-	1. Se generaliza el programa para usar este formato.
-	1. Se muestran la informacion de los ejes mostrados y cuantos hay.
-	1. Se pueden cambiar los ejes por pares
-		1. Usando el mouse.
-		1. Usando el teclado.
-0. Detalles.
-	1. Se anima el cambio de eje.
-	1. Se hace el generador de GIF.
-	1. Se puede cambiar el shader 
-	1. Documentacion
-
-

doc/es/tech/problemas.md

@@ -1,22 +0,0 @@
-# Problemas esperados al desarrollar
-Diaz Camacho Pedro Emilio
-
-## OpenGL esperan objetos tridimensionales, no de n dimensiones.
-
-Usando glVertexAttribPointer podemos pasar las coordenadas que 
-queramos de los puntos de las variedades, y con ello usar objetos 3D en
-el shader.
-
-## Rotar ejes por pares en una animacion continua.
-- Con glVertexAttribPointer podemos pasar las coordenadas del eje 
-seleccionado, al shader.
-- Con la funcion mix del shader y bloqueando el input, podemos hacer 
-una animacion pasando una variable con la cpu.
-- Cuando la animacion termine intercambiar los indices del layout, 
-usando glVertexAttribPointer otra vez.
-
-## Volumen de la variedad.
-Dado que la funcion parametrizadora es continua, mandamos la frontera
-de un n-cubo a la frontera de una variedad, por lo que solo basta 
-graficar la frontera de la variedad.
-

doc/es/user.md

@@ -1,19 +0,0 @@
-# Manual de usario para Manigraph
-Manigraph es un graficador interactivo de variedades que lee archivos
-binarios de una variedad multidimensional y los proyecta a 3 dimensiones.
-
-# Glosario
-Llamaremos a los 3 ejes de la proyección tridimensional `X`, `Y` y `Z`,
-este sistema de coordenadas es derecho con el eje `Z` apuntando afuera de la pantalla
-
-# Controles
-## Teclado
-- `Q` Rota el eje `X` de forma horaria.
-- `W` Rota el eje `X` de forma antihoraria.
-- `A` Rota el eje `Y` de forma horaria.
-- `S` Rota el eje `Y` de forma antihoraria.
-- `Z` Rota el eje `Z` de forma horaria.
-- `X` Rota el eje `Z` de forma antihoraria.
-## Mouse
-- Hacer `click` en un eje lo selecciona.
-- El `scroll` del mouse hace girar al eje seleccionado.

doc/file_layout.svg

@@ -0,0 +1,10 @@
+<svg version="1.1" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1024.1997862712624 780.4323630001875" width="2048.3995725425248" height="1560.864726000375" filter="invert(93%) hue-rotate(180deg)">
+  <!-- svg-source:excalidraw -->
+  
+  <defs>
+    <style class="style-fonts">
+      @font-face { font-family: Excalifont; src: 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example/basic.c

@@ -0,0 +1,92 @@
+#include <math.h>
+#include <stdio.h>
+
+#define KLEIN_IMPLEMENT
+#include <klein/klein.h>
+#include <klein/norm.h>
+#include <klein/parm.h>
+
+#ifndef M_PI
+#define M_PI 3.14159265358979323846
+#endif
+
+void cube(float *d_surface, int *coord, unsigned char *grid)
+{
+	int i;
+
+	for (i = 0; i < 4; i++)
+		d_surface[i] = (2 * (float)coord[i] / grid[i]) - 1;
+
+	if (4 == 2)
+		d_surface[2] = 0;
+}
+
+void mobius(float *d_surface, int *coord, unsigned char *grid)
+{
+	const float width = 0.5;
+	float u = (2 * M_PI) * ((float)coord[0] / grid[0]);
+	float v = (2 * width) * ((float)coord[1] / grid[1]) - width;
+
+	d_surface[0] = cos(u) + v * cos(u / 2) * cos(u);
+	d_surface[1] = sin(u) + v * cos(u / 2) * sin(u);
+	d_surface[2] = v * sin(u / 2);
+}
+
+void torus(float *d_surface, int *coord, unsigned char *grid)
+{
+	float u = (2 * M_PI) * ((float)coord[0] / grid[0]);
+	float v = (2 * M_PI) * ((float)coord[1] / grid[1]);
+
+	d_surface[0] = (1 + 0.5 * cos(v)) * cos(u);
+	d_surface[1] = (1 + 0.5 * cos(v)) * sin(u);
+	d_surface[2] = 0.5 * sin(v);
+}
+
+void klein(float *d_surface, int *coord, unsigned char *grid)
+{
+	float u = (2 * M_PI) * ((float)coord[0] / grid[0]);
+	float v = (2 * M_PI) * ((float)coord[1] / grid[1]);
+
+	d_surface[0] = (0.5 * cos(v) + 0.5) * cos(u);
+	d_surface[1] = (0.5 * cos(v) + 0.5) * sin(u);
+	d_surface[2] = sin(v) * cos(u / 2);
+	d_surface[3] = sin(v) * sin(u / 2);
+}
+
+int main(void)
+{
+	unsigned char i = 0;
+	const char *file_name[] = {"mobius.klein", "torus.klein", "klein.klein"};
+	struct parm parametrization[] = {{
+										 .grid = (unsigned char[]){16, 4},
+										 .m = 2,
+										 .n = 3,
+										 .f = mobius,
+									 },
+		{
+			.grid = (unsigned char[]){16, 8},
+			.m = 2,
+			.n = 3,
+			.f = torus,
+		},
+		{
+			.grid = (unsigned char[]){16, 16},
+			.m = 2,
+			.n = 4,
+			.f = klein,
+		}};
+
+	for (i = 0; i < 3; ++i)
+	{
+		struct klein klein;
+		printf("writing %s\n", file_name[i]);
+
+		klein_parametrize(&klein, parametrization[i]);
+		klein_normalize(&klein);
+		klein_export_file(klein, file_name[i]);
+
+		free(klein.vertex);
+		free(klein.normals);
+	}
+	return 0;
+}

example/lens.c

@@ -0,0 +1,54 @@
+#include <math.h>
+#include <stdio.h>
+
+#define KLEIN_IMPLEMENT
+#include <klein/klein.h>
+#include <klein/norm.h>
+#include <klein/parm.h>
+
+int p = 37;
+int q = 7;
+
+void lens(float *d_surface, int *coord, unsigned char * grid)
+{
+
+	float norm = 0;
+	float sphere[4];
+
+	for (int i = 0; i < 4; i++)
+		sphere[i] = ((float)coord[i] / grid[i]) - 0.5;
+
+	for(int i = 0; i < 4; i++)
+		norm += sphere[i] * sphere[i];
+
+	for (int i = 0; i < 4; i++)
+		sphere[i] = sphere[i] / sqrt(norm);
+	
+	d_surface[0] = (sphere[0] * cos(2 * M_PI / p)) - (sphere[1] * sin(2 * M_PI / p));
+	d_surface[1] = (sphere[0] * sin(2 * M_PI / p)) + (sphere[1] * cos(2 * M_PI / p));
+	d_surface[2] = (sphere[2] * cos(2 * M_PI * q / p)) - (sphere[3] * sin(2 * M_PI * q / p));
+	d_surface[3] = (sphere[2] * sin(2 * M_PI * q / p)) + (sphere[3] * cos(2 * M_PI * q / p));
+}
+
+int main(void)
+{
+	char file_name[0xff];
+	struct klein klein;
+	struct parm parametrization = {
+		.grid = (unsigned char[]){8, 8,8,8},
+		.m = 4,
+		.n = 4,
+		.f = lens,
+	};
+
+	snprintf(file_name, 0xff, "lens-%03d-%03d.klein", p, q);
+	printf("writing %s\n", file_name);
+
+	klein_parametrize(&klein, parametrization);
+	klein_normalize(&klein);
+	klein_export_file(klein, file_name);
+
+	free(klein.vertex);
+	free(klein.normals);
+	return 0;
+}

example/n-cube.c

@@ -0,0 +1,50 @@
+#include <math.h>
+#include <stdio.h>
+
+#define KLEIN_IMPLEMENT
+#include <klein/klein.h>
+#include <klein/norm.h>
+#include <klein/parm.h>
+
+#ifndef M_PI
+#define M_PI 3.14159265358979323846
+#endif
+
+unsigned char dim = 10;
+
+void cube(float *d_surface, int *coord, unsigned char *grid)
+{
+	int i;
+
+	for (i = 0; i < dim; i++)
+		d_surface[i] = (2 * (float)coord[i] / grid[i]) - 1;
+
+	if (dim == 2)
+		d_surface[2] = 0;
+}
+
+int main(void)
+{
+	unsigned char i;
+	char file_name[0xff];
+	struct klein klein;
+	struct parm parametrization = {
+		.m = dim,
+		.n = dim,
+		.f = cube,
+	};
+
+	parametrization.grid = malloc(dim);
+	
+	for (i = 0; i < dim; ++i)
+		parametrization.grid[i] = 1 + i;
+
+	snprintf(file_name, 0xff, "cube-%03d.klein", dim);
+	printf("writing %s\n", file_name);
+
+	klein_parametrize(&klein, parametrization);
+	klein_normalize(&klein);
+	klein_export_file(klein, file_name);
+
+	return 0;
+}

example/riemman.c

@@ -0,0 +1,50 @@
+#include <complex.h>
+#include <math.h>
+#include <stdio.h>
+
+#define KLEIN_IMPLEMENT
+#include <klein/klein.h>
+#include <klein/norm.h>
+#include <klein/parm.h>
+
+#ifndef CMPLX
+#define CMPLX(a, b) (a + I * b)
+#endif
+
+complex float f(complex float z) { return csqrt(z); }
+
+void riemman(float *d_surface, int *coords, unsigned char *grid)
+{
+	complex float eq;
+	float u = 2 * ((float)coords[0] / grid[0]) - 1;
+	float v = 2 * ((float)coords[1] / grid[1]) - 1;
+
+	eq = f(CMPLX(u, v));
+
+	d_surface[0] = u;
+	d_surface[1] = v;
+	d_surface[2] = creal(eq);
+	d_surface[3] = cimag(eq);
+}
+
+int main(void)
+{
+	const char *file_name = "riemman.klein";
+	struct klein klein;
+	struct parm parametrization = {
+		.grid = (unsigned char[]){16, 4},
+		.m = 2,
+		.n = 4,
+		.f = riemman,
+	};
+
+	printf("writing %s\n", file_name);
+
+	klein_parametrize(&klein, parametrization);
+	klein_normalize(&klein);
+	klein_export_file(klein, file_name);
+
+	free(klein.vertex);
+	free(klein.normals);
+	return 0;
+}

ext/glad/khrplatform.h

@@ -0,0 +1,311 @@
+#ifndef __khrplatform_h_
+#define __khrplatform_h_
+
+/*
+** Copyright (c) 2008-2018 The Khronos Group Inc.
+**
+** Permission is hereby granted, free of charge, to any person obtaining a
+** copy of this software and/or associated documentation files (the
+** "Materials"), to deal in the Materials without restriction, including
+** without limitation the rights to use, copy, modify, merge, publish,
+** distribute, sublicense, and/or sell copies of the Materials, and to
+** permit persons to whom the Materials are furnished to do so, subject to
+** the following conditions:
+**
+** The above copyright notice and this permission notice shall be included
+** in all copies or substantial portions of the Materials.
+**
+** THE MATERIALS ARE PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+** EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+** MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+** IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+** CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+** TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+** MATERIALS OR THE USE OR OTHER DEALINGS IN THE MATERIALS.
+*/
+
+/* Khronos platform-specific types and definitions.
+ *
+ * The master copy of khrplatform.h is maintained in the Khronos EGL
+ * Registry repository at https://github.com/KhronosGroup/EGL-Registry
+ * The last semantic modification to khrplatform.h was at commit ID:
+ *      67a3e0864c2d75ea5287b9f3d2eb74a745936692
+ *
+ * Adopters may modify this file to suit their platform. Adopters are
+ * encouraged to submit platform specific modifications to the Khronos
+ * group so that they can be included in future versions of this file.
+ * Please submit changes by filing pull requests or issues on
+ * the EGL Registry repository linked above.
+ *
+ *
+ * See the Implementer's Guidelines for information about where this file
+ * should be located on your system and for more details of its use:
+ *    http://www.khronos.org/registry/implementers_guide.pdf
+ *
+ * This file should be included as
+ *        #include <KHR/khrplatform.h>
+ * by Khronos client API header files that use its types and defines.
+ *
+ * The types in khrplatform.h should only be used to define API-specific types.
+ *
+ * Types defined in khrplatform.h:
+ *    khronos_int8_t              signed   8  bit
+ *    khronos_uint8_t             unsigned 8  bit
+ *    khronos_int16_t             signed   16 bit
+ *    khronos_uint16_t            unsigned 16 bit
+ *    khronos_int32_t             signed   32 bit
+ *    khronos_uint32_t            unsigned 32 bit
+ *    khronos_int64_t             signed   64 bit
+ *    khronos_uint64_t            unsigned 64 bit
+ *    khronos_intptr_t            signed   same number of bits as a pointer
+ *    khronos_uintptr_t           unsigned same number of bits as a pointer
+ *    khronos_ssize_t             signed   size
+ *    khronos_usize_t             unsigned size
+ *    khronos_float_t             signed   32 bit floating point
+ *    khronos_time_ns_t           unsigned 64 bit time in nanoseconds
+ *    khronos_utime_nanoseconds_t unsigned time interval or absolute time in
+ *                                         nanoseconds
+ *    khronos_stime_nanoseconds_t signed time interval in nanoseconds
+ *    khronos_boolean_enum_t      enumerated boolean type. This should
+ *      only be used as a base type when a client API's boolean type is
+ *      an enum. Client APIs which use an integer or other type for
+ *      booleans cannot use this as the base type for their boolean.
+ *
+ * Tokens defined in khrplatform.h:
+ *
+ *    KHRONOS_FALSE, KHRONOS_TRUE Enumerated boolean false/true values.
+ *
+ *    KHRONOS_SUPPORT_INT64 is 1 if 64 bit integers are supported; otherwise 0.
+ *    KHRONOS_SUPPORT_FLOAT is 1 if floats are supported; otherwise 0.
+ *
+ * Calling convention macros defined in this file:
+ *    KHRONOS_APICALL
+ *    KHRONOS_APIENTRY
+ *    KHRONOS_APIATTRIBUTES
+ *
+ * These may be used in function prototypes as:
+ *
+ *      KHRONOS_APICALL void KHRONOS_APIENTRY funcname(
+ *                                  int arg1,
+ *                                  int arg2) KHRONOS_APIATTRIBUTES;
+ */
+
+#if defined(__SCITECH_SNAP__) && !defined(KHRONOS_STATIC)
+#   define KHRONOS_STATIC 1
+#endif
+
+/*-------------------------------------------------------------------------
+ * Definition of KHRONOS_APICALL
+ *-------------------------------------------------------------------------
+ * This precedes the return type of the function in the function prototype.
+ */
+#if defined(KHRONOS_STATIC)
+    /* If the preprocessor constant KHRONOS_STATIC is defined, make the
+     * header compatible with static linking. */
+#   define KHRONOS_APICALL
+#elif defined(_WIN32)
+#   define KHRONOS_APICALL __declspec(dllimport)
+#elif defined (__SYMBIAN32__)
+#   define KHRONOS_APICALL IMPORT_C
+#elif defined(__ANDROID__)
+#   define KHRONOS_APICALL __attribute__((visibility("default")))
+#else
+#   define KHRONOS_APICALL
+#endif
+
+/*-------------------------------------------------------------------------
+ * Definition of KHRONOS_APIENTRY
+ *-------------------------------------------------------------------------
+ * This follows the return type of the function  and precedes the function
+ * name in the function prototype.
+ */
+#if defined(_WIN32) && !defined(_WIN32_WCE) && !defined(__SCITECH_SNAP__)
+    /* Win32 but not WinCE */
+#   define KHRONOS_APIENTRY __stdcall
+#else
+#   define KHRONOS_APIENTRY
+#endif
+
+/*-------------------------------------------------------------------------
+ * Definition of KHRONOS_APIATTRIBUTES
+ *-------------------------------------------------------------------------
+ * This follows the closing parenthesis of the function prototype arguments.
+ */
+#if defined (__ARMCC_2__)
+#define KHRONOS_APIATTRIBUTES __softfp
+#else
+#define KHRONOS_APIATTRIBUTES
+#endif
+
+/*-------------------------------------------------------------------------
+ * basic type definitions
+ *-----------------------------------------------------------------------*/
+#if (defined(__STDC_VERSION__) && __STDC_VERSION__ >= 199901L) || defined(__GNUC__) || defined(__SCO__) || defined(__USLC__)
+
+
+/*
+ * Using <stdint.h>
+ */
+#include <stdint.h>
+typedef int32_t                 khronos_int32_t;
+typedef uint32_t                khronos_uint32_t;
+typedef int64_t                 khronos_int64_t;
+typedef uint64_t                khronos_uint64_t;
+#define KHRONOS_SUPPORT_INT64   1
+#define KHRONOS_SUPPORT_FLOAT   1
+/*
+ * To support platform where unsigned long cannot be used interchangeably with
+ * inptr_t (e.g. CHERI-extended ISAs), we can use the stdint.h intptr_t.
+ * Ideally, we could just use (u)intptr_t everywhere, but this could result in
+ * ABI breakage if khronos_uintptr_t is changed from unsigned long to
+ * unsigned long long or similar (this results in different C++ name mangling).
+ * To avoid changes for existing platforms, we restrict usage of intptr_t to
+ * platforms where the size of a pointer is larger than the size of long.
+ */
+#if defined(__SIZEOF_LONG__) && defined(__SIZEOF_POINTER__)
+#if __SIZEOF_POINTER__ > __SIZEOF_LONG__
+#define KHRONOS_USE_INTPTR_T
+#endif
+#endif
+
+#elif defined(__VMS ) || defined(__sgi)
+
+/*
+ * Using <inttypes.h>
+ */
+#include <inttypes.h>
+typedef int32_t                 khronos_int32_t;
+typedef uint32_t                khronos_uint32_t;
+typedef int64_t                 khronos_int64_t;
+typedef uint64_t                khronos_uint64_t;
+#define KHRONOS_SUPPORT_INT64   1
+#define KHRONOS_SUPPORT_FLOAT   1
+
+#elif defined(_WIN32) && !defined(__SCITECH_SNAP__)
+
+/*
+ * Win32
+ */
+typedef __int32                 khronos_int32_t;
+typedef unsigned __int32        khronos_uint32_t;
+typedef __int64                 khronos_int64_t;
+typedef unsigned __int64        khronos_uint64_t;
+#define KHRONOS_SUPPORT_INT64   1
+#define KHRONOS_SUPPORT_FLOAT   1
+
+#elif defined(__sun__) || defined(__digital__)
+
+/*
+ * Sun or Digital
+ */
+typedef int                     khronos_int32_t;
+typedef unsigned int            khronos_uint32_t;
+#if defined(__arch64__) || defined(_LP64)
+typedef long int                khronos_int64_t;
+typedef unsigned long int       khronos_uint64_t;
+#else
+typedef long long int           khronos_int64_t;
+typedef unsigned long long int  khronos_uint64_t;
+#endif /* __arch64__ */
+#define KHRONOS_SUPPORT_INT64   1
+#define KHRONOS_SUPPORT_FLOAT   1
+
+#elif 0
+
+/*
+ * Hypothetical platform with no float or int64 support
+ */
+typedef int                     khronos_int32_t;
+typedef unsigned int            khronos_uint32_t;
+#define KHRONOS_SUPPORT_INT64   0
+#define KHRONOS_SUPPORT_FLOAT   0
+
+#else
+
+/*
+ * Generic fallback
+ */
+#include <stdint.h>
+typedef int32_t                 khronos_int32_t;
+typedef uint32_t                khronos_uint32_t;
+typedef int64_t                 khronos_int64_t;
+typedef uint64_t                khronos_uint64_t;
+#define KHRONOS_SUPPORT_INT64   1
+#define KHRONOS_SUPPORT_FLOAT   1
+
+#endif
+
+
+/*
+ * Types that are (so far) the same on all platforms
+ */
+typedef signed   char          khronos_int8_t;
+typedef unsigned char          khronos_uint8_t;
+typedef signed   short int     khronos_int16_t;
+typedef unsigned short int     khronos_uint16_t;
+
+/*
+ * Types that differ between LLP64 and LP64 architectures - in LLP64,
+ * pointers are 64 bits, but 'long' is still 32 bits. Win64 appears
+ * to be the only LLP64 architecture in current use.
+ */
+#ifdef KHRONOS_USE_INTPTR_T
+typedef intptr_t               khronos_intptr_t;
+typedef uintptr_t              khronos_uintptr_t;
+#elif defined(_WIN64)
+typedef signed   long long int khronos_intptr_t;
+typedef unsigned long long int khronos_uintptr_t;
+#else
+typedef signed   long  int     khronos_intptr_t;
+typedef unsigned long  int     khronos_uintptr_t;
+#endif
+
+#if defined(_WIN64)
+typedef signed   long long int khronos_ssize_t;
+typedef unsigned long long int khronos_usize_t;
+#else
+typedef signed   long  int     khronos_ssize_t;
+typedef unsigned long  int     khronos_usize_t;
+#endif
+
+#if KHRONOS_SUPPORT_FLOAT
+/*
+ * Float type
+ */
+typedef          float         khronos_float_t;
+#endif
+
+#if KHRONOS_SUPPORT_INT64
+/* Time types
+ *
+ * These types can be used to represent a time interval in nanoseconds or
+ * an absolute Unadjusted System Time.  Unadjusted System Time is the number
+ * of nanoseconds since some arbitrary system event (e.g. since the last
+ * time the system booted).  The Unadjusted System Time is an unsigned
+ * 64 bit value that wraps back to 0 every 584 years.  Time intervals
+ * may be either signed or unsigned.
+ */
+typedef khronos_uint64_t       khronos_utime_nanoseconds_t;
+typedef khronos_int64_t        khronos_stime_nanoseconds_t;
+#endif
+
+/*
+ * Dummy value used to pad enum types to 32 bits.
+ */
+#ifndef KHRONOS_MAX_ENUM
+#define KHRONOS_MAX_ENUM 0x7FFFFFFF
+#endif
+
+/*
+ * Enumerated boolean type
+ *
+ * Values other than zero should be considered to be true.  Therefore
+ * comparisons should not be made against KHRONOS_TRUE.
+ */
+typedef enum {
+    KHRONOS_FALSE = 0,
+    KHRONOS_TRUE  = 1,
+    KHRONOS_BOOLEAN_ENUM_FORCE_SIZE = KHRONOS_MAX_ENUM
+} khronos_boolean_enum_t;
+
+#endif /* __khrplatform_h_ */

ext/glfw.mk

@@ -0,0 +1,71 @@
+BIN = libglfw.a
+OBJ = \
+	glfw/src/context.o \
+	glfw/src/egl_context.o \
+	glfw/src/glx_context.o \
+	glfw/src/init.o \
+	glfw/src/input.o \
+	glfw/src/linux_joystick.o \
+	glfw/src/monitor.o \
+	glfw/src/null_init.o \
+	glfw/src/null_joystick.o \
+	glfw/src/null_monitor.o \
+	glfw/src/null_window.o \
+	glfw/src/osmesa_context.o \
+	glfw/src/platform.o \
+	glfw/src/posix_module.o \
+	glfw/src/posix_poll.o \
+	glfw/src/posix_thread.o \
+	glfw/src/posix_time.o \
+	glfw/src/vulkan.o \
+	glfw/src/wgl_context.o \
+	glfw/src/win32_init.o \
+	glfw/src/win32_joystick.o \
+	glfw/src/win32_module.o \
+	glfw/src/win32_monitor.o \
+	glfw/src/win32_thread.o \
+	glfw/src/win32_time.o \
+	glfw/src/win32_window.o \
+	glfw/src/window.o \
+	glfw/src/wl_init.o \
+	glfw/src/wl_monitor.o \
+	glfw/src/wl_window.o \
+	glfw/src/x11_init.o \
+	glfw/src/x11_monitor.o \
+	glfw/src/x11_window.o \
+	glfw/src/xkb_unicode.o 
+
+WAYLAND-LIB = \
+	xdg-shell \
+	relative-pointer-unstable-v1 \
+	xdg-decoration-unstable-v1 \
+	pointer-constraints-unstable-v1 \
+	viewporter \
+	idle-inhibit-unstable-v1  \
+	fractional-scale-v1 \
+	xdg-activation-v1 \
+	wayland
+
+windows: 
+	$(MAKE) $(OBJ) CFLAGS="-D_GLFW_WIN32 -Iglfw/deps/wayland"
+	$(AR) rsc $(BIN) $(OBJ)
+
+linux-x11: 
+	$(MAKE) $(OBJ) CFLAGS="-D_GLFW_X11 -Iglfw/deps/wayland"
+	$(AR) rsc $(BIN) $(OBJ)
+
+
+linux-wayland: 
+	for i in $(WAYLAND-LIB); \
+	do  \
+		wayland-scanner client-header glfw/deps/wayland/$$i.xml glfw/deps/wayland/$$i-client-protocol.h; \
+		wayland-scanner private-code glfw/deps/wayland/$$i.xml glfw/deps/wayland/$$i-client-protocol-code.h; \
+	done
+	$(MAKE) $(OBJ) CFLAGS="-D_GLFW_WAYLAND -fPIC -Iglfw/deps/wayland"
+	$(AR) rsc $(BIN) $(OBJ)
+
+
+
+clean:
+	rm $(OBJ) $(BIN)
+	rm glfw/deps/wayland/*.h

include/klein/klein.h

@@ -0,0 +1,48 @@
+#ifdef KLEIN_H
+#error file included twice
+#endif
+#define KLEIN_H
+
+#ifdef KLEIN_IMPLEMENT
+#include <stdio.h>
+#include <stdlib.h>
+#endif
+
+struct klein
+{
+	unsigned long vertex_size;
+	float *vertex, *normals;
+	unsigned char dim;
+};
+
+/*
+	The klein format must have:
+		5 bytes with klein.
+		1 byte empty for expantions
+		1 byte with the dimention of the surface
+
+*/
+
+static inline
+int klein_export_file(struct klein klein, const char * filename);
+
+
+#ifdef KLEIN_IMPLEMENT
+static inline
+int klein_export_file(struct klein klein, const char * filename)
+{
+	FILE *file = fopen(filename, "wb");
+	if (!file)
+		return 1;
+
+	fwrite("KLEIN", 1, 5, file);
+	fwrite("\0", 1, 1, file);
+	fwrite(&klein.dim, 1, 1, file);
+	fwrite(&klein.vertex_size, 8, 1, file);
+	fwrite(klein.vertex, 4, klein.vertex_size * klein.dim, file);
+	fwrite(klein.normals, 4, klein.vertex_size * klein.dim, file);
+
+	fclose(file);
+	return 0;
+}
+#endif

include/klein/norm.h

@@ -0,0 +1,132 @@
+#ifdef KLEIN_NORM_H
+#error file included twice
+#endif
+#define KLEIN_NORM_H
+
+
+#ifndef KLEIN_H
+#warning Please include klein/klein.h
+#endif
+
+void klein_normalize(struct klein * klein);
+
+#ifdef KLEIN_IMPLEMENT
+static inline
+void __calculate_normal( float *p1, float *p2, float *p3, float *normal, unsigned char n)
+{ unsigned char i;
+	float alpha;
+	float *v1, *v2, *v3;
+	float *u1, *u2, *u3;
+
+	v1 = malloc(n * sizeof(float));
+	v2 = malloc(n * sizeof(float));
+	v3 = malloc(n * sizeof(float));
+	u1 = malloc(n * sizeof(float));
+	u2 = malloc(n * sizeof(float));
+	u3 = malloc(n * sizeof(float));
+
+	/*
+		Calculate a normal vector of a plain using Gram-Schmidt process
+	*/
+	{
+		for (i = 0; i < n; ++i)
+		{
+			v1[i] = p2[i] - p1[i];
+			v2[i] = p3[i] - p1[i];
+			v3[i] = p1[i];
+		}
+
+		for (i = 0; i < n; ++i)
+		{
+			u1[i] = v1[i];
+		}
+
+		{
+			float proj[n];
+			float dot_v2_u1 = 0.0f, dot_u1_u1 = 0.0f;
+			for (i = 0; i < n; ++i)
+			{
+				dot_v2_u1 += v2[i] * u1[i];
+				dot_u1_u1 += u1[i] * u1[i];
+			}
+			alpha = dot_v2_u1 / dot_u1_u1;
+
+			for (i = 0; i < n; ++i)
+			{
+				proj[i] = u1[i] * alpha;
+				u2[i] = v2[i] - proj[i];
+			}
+		}
+
+		{
+			float proj1[n], proj2[n];
+			float dot_v3_u1 = 0.0f, dot_u1_u1 = 0.0f;
+			float dot_v3_u2 = 0.0f, dot_u2_u2 = 0.0f;
+
+			for (i = 0; i < n; ++i)
+			{
+				dot_v3_u1 += v3[i] * u1[i];
+				dot_u1_u1 += u1[i] * u1[i];
+			}
+			for (i = 0; i < n; ++i)
+			{
+				proj1[i] = u1[i] * (dot_v3_u1 / dot_u1_u1);
+			}
+
+			for (i = 0; i < n; ++i)
+			{
+				dot_v3_u2 += v3[i] * u2[i];
+				dot_u2_u2 += u2[i] * u2[i];
+			}
+			for (i = 0; i < n; ++i)
+			{
+				proj2[i] = u2[i] * (dot_v3_u2 / dot_u2_u2);
+				u3[i] = v3[i] - proj1[i] - proj2[i];
+			}
+		}
+
+		float magnitude = 0.0f;
+		for (i = 0; i < n; ++i)
+		{
+			magnitude += u3[i] * u3[i];
+		}
+		magnitude = sqrtf(magnitude);
+
+		for (i = 0; i < n; ++i)
+		{
+			normal[i] = u3[i] / magnitude;
+		}
+
+		free(v1);
+		free(v2);
+		free(v3);
+		free(u1);
+		free(u2);
+		free(u3);
+		return;
+	}
+}
+
+void klein_normalize(struct klein * klein)
+{
+	unsigned long i;
+	unsigned char j;
+	float *norm_vec;
+
+	klein->normals = malloc((klein->dim * klein->vertex_size) * sizeof(float));
+	norm_vec = malloc(klein->dim * sizeof(float));
+
+	for (i = 0; i < klein->vertex_size; i += 3 * klein->dim)
+	{
+		__calculate_normal(klein->vertex + i, klein->vertex + i + klein->dim, klein->vertex + i + 2 * klein->dim, norm_vec, klein->dim);
+		for (j = 0; j < klein->dim; ++j )
+		{
+			(klein->normals + i)[j]=norm_vec[j];
+			(klein->normals + i + klein->dim)[j]=norm_vec[j];
+			(klein->normals + i + 2*klein->dim)[j]=norm_vec[j];
+		}
+	}
+
+	free(norm_vec);
+}
+#endif

include/klein/parm.h

@@ -0,0 +1,134 @@
+#ifndef KLEIN_H
+#warning Please include klein/klein.h before klein/parm.h
+#endif
+
+#ifdef KLEIN_PARM_H
+#error file included twice
+#endif
+#define KLEIN_PARM_H
+
+
+typedef void (*function_t)(float *, int *, unsigned char *);
+
+struct parm
+{
+	unsigned char *grid;
+	unsigned char m, n;
+	function_t f;
+};
+
+
+void klein_parametrize( struct klein * klein, struct parm parm );
+
+#ifdef KLEIN_IMPLEMENT
+#ifdef TEST
+#include <assert.h>
+#endif
+
+static inline int __factorial(int n)
+{
+	if (n == 1)
+		return 1;
+
+	return n * __factorial(n - 1);
+}
+
+static inline int __face(int n)
+{
+	if (n == 2)
+		return 1;
+
+	return (1 << (n - 3)) * __factorial(n) / __factorial(n - 2);
+}
+
+void klein_parametrize( struct klein * klein, struct parm parm)
+{
+	unsigned int i, j, k, o, p, n;
+	unsigned long size, q = 0;
+	int *face;
+
+#ifdef TEST
+	assert(__face(2) == 1);
+	assert(__face(3) == 6);
+	assert(__face(4) == 24);
+#endif
+
+	klein->dim = parm.n;
+	klein->vertex_size = 0;
+	{
+		unsigned char test = 0;
+		for (o = 0; o < parm.m; o++)
+		{
+			for (p = 0; p < o; p++)
+			{
+				test += 1;
+				klein->vertex_size += parm.grid[p] * parm.grid[o] * 6 * __face(parm.m);
+			}
+		}
+		klein->vertex_size /= test;
+	}
+
+	size = (klein->dim) * (klein->vertex_size);
+	klein->vertex = malloc(size * sizeof(float));
+
+	face = malloc(parm.m * sizeof(int));
+
+	for (o = 0; o < parm.m; o++)
+	{
+		for (p = 0; p < o; p++)
+		{
+			for (k = 0; k < (1 << (parm.m - 2)); k++)
+			{
+				unsigned char skip = 0;
+				for (n = 0; n < parm.m; n++)
+				{
+					if (n == o || n == p)
+						skip++;
+
+					face[n] = (k & (1 << (n - skip))) ? parm.grid[n] : 0;
+				}
+
+				for (i = 0; i < parm.grid[p]; i++)
+				{
+					for (j = 0; j < parm.grid[o]; j++)
+					{
+						face[p] = i;
+						face[o] = j;
+						parm.f(&klein->vertex[q], face, parm.grid);
+						q += parm.n;
+
+						face[p] = i + 1;
+						face[o] = j;
+						parm.f(&klein->vertex[q], face, parm.grid);
+						q += parm.n;
+
+						face[p] = i + 1;
+						face[o] = j + 1;
+						parm.f(&klein->vertex[q], face, parm.grid);
+						q += parm.n;
+
+						face[p] = i;
+						face[o] = j;
+						parm.f(&klein->vertex[q], face, parm.grid);
+						q += parm.n;
+
+						face[p] = i;
+						face[o] = j + 1;
+						parm.f(&klein->vertex[q], face, parm.grid);
+						q += parm.n;
+
+						face[p] = i + 1;
+						face[o] = j + 1;
+						parm.f(&klein->vertex[q], face, parm.grid);
+						q += parm.n;
+					}
+				}
+			}
+		}
+	}
+
+#ifdef TEST
+	assert(q == size);
+#endif
+}
+#endif

src/context.c

@@ -1,13 +1,31 @@
 #include "main.h"
+
+#ifdef EMSCRIPTEN
 #include <GL/gl.h>
+#else
+#include <glad.h>
+#include <GLFW/glfw3.h>
+#endif
 
-void set_clean_color_context( unsigned char r, unsigned char g, unsigned char b )
+void set_clean_color_context(unsigned char r, unsigned char g, unsigned char b)
 {
-	glEnable( GL_DEPTH_TEST );
+	glClearColor((float)r / 0xff, (float)g / 0xff, (float)b / 0xff, 1.0);
-	glClearColor( (float)r/0xff, (float)g/0xff, (float)b/0xff, 1.0 );
 }
 
-void clean_context( void )
+int init_context(void)
 {
-	glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );
+#ifdef EMSCRIPTEN
+	return 1;
+#else
+	return gladLoadGLLoader((GLADloadproc)glfwGetProcAddress);
+#endif
+}
+
+void clean_context(void)
+{
+	/* This is important cos, Nuklear Disable DEPTH TEST */
+	glEnable(GL_BLEND);
+	glEnable(GL_DEPTH_TEST);
+	glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
+	glClear(GL_COLOR_BUFFER_BIT| GL_DEPTH_BUFFER_BIT );
 }

src/data/axis.h

@@ -1,45 +0,0 @@
-#undef A
-#undef B
-#undef C
-#undef D
-#undef E
-#undef F
-#undef G
-#undef H
-
-const float X = 2.0;
-const float Y = 0.05;
-const float Z = 0.05;
-
-#define A -X,-Y,-Z,
-#define B -X,-Y, Z,
-#define C -X, Y,-Z,
-#define D -X, Y, Z,
-#define E  X,-Y,-Z,
-#define F  X,-Y, Z,
-#define G  X, Y,-Z,
-#define H  X, Y, Z,
-
-narray_float_t d_axis =
-{
-	3*3*2*6,
-
-	A C E
-	C E G
-
-	E G F
-	G F H
-
-	F H B
-	H B D
-
-	B D A
-	D A C
-
-	C D G
-	D G H
-
-	A B E 
-	B E F
-
-};

src/data/shaders.h

@@ -1,30 +1,98 @@
-const char * vs =
+const char *vs =
+#ifdef EMSCRIPTEN
+	"#version 300 es\n"
+	"precision highp float;"
+#else
 	"#version 330 core\n"
+#endif
+	"layout (location = 0) in float aPos_x;"
+	"layout (location = 1) in float aPos_y;"
+	"layout (location = 2) in float aPos_z;"
+	"layout (location = 3) in float aPos_w;"
 
-	"layout (location = 0) in vec3 aPos;"
+	"layout (location = 4) in float aNormal_x;"
+	"layout (location = 5) in float aNormal_y;"
+	"layout (location = 6) in float aNormal_z;"
+	"layout (location = 7) in float aNormal_w;"
+
+	"uniform float angle;"
+	"uniform float i;"
+	"uniform vec4 color;"
 
-	"uniform float idx;"
 	"uniform mat4 fix;"
 	"uniform mat4 rot;"
-	"uniform mat4 mdl;"
 
-	"out float index;"
+	"out vec3 Normal;"
+	"out vec3 FragPos;"
+	"out vec4 Color;"
+
+	"mat2 rotate2d( float angle )"
+	"{"
+	"return mat2( cos(angle), sin(angle), -sin(angle), cos(angle) );"
+	"}"
 
 	"void main()"
 	"{"
-	"	index=idx;"
+	"	Color=color;"
-	"	gl_Position = fix * rot * mdl * vec4( aPos, 1.0 );\n"
+
+	"	vec3 aNormal = vec3(aNormal_x,aNormal_y,aNormal_z);"
+	"	vec3 aPos = vec3(aPos_x,aPos_y,aPos_z);"
+
+	"	aNormal[int(i)] = (vec2(aNormal[int(i)], aNormal_w) * "
+	"rotate2d(angle))[0];"
+	"	aPos[int(i)] = (vec2(aPos[int(i)], aPos_w) * rotate2d(angle))[0];"
+
+	"	Normal = mat3(transpose(inverse(rot))) * aNormal;"
+	"	gl_Position = fix * rot * vec4( aPos, 1.0 );\n"
+	"	FragPos = vec3( rot * vec4(aPos, 1.0));"
 	"}";
 
-const char * fs =
+const char *fs_plain =
+#ifdef EMSCRIPTEN
+	"#version 300 es\n"
+	"precision highp float;"
+#else
 	"#version 330 core\n"
+#endif
+	"out vec4 FragColor;"
+	"in vec3 Normal;"
+	"in vec3 FragPos;"
+	"in vec4 Color;"
 
-	"uniform sampler2DArray palette;"
+	"void main()"
+	"{"
+	"	FragColor = vec4(pow(vec3(Color),vec3(1.0/1.0)),Color.a);"
+	"}";
+
+const char *fs =
+#ifdef EMSCRIPTEN
+	"#version 300 es\n"
+	"precision highp float;"
+#else
+	"#version 330 core\n"
+#endif
+
+	"in vec3 Normal;"
+	"in vec3 FragPos;"
+	"in vec4 Color;"
 
-	"in float index;"
 	"out vec4 FragColor;"
 
 	"void main()"
 	"{"
-	"	FragColor = texture( palette, vec3( 0, 0, index ) ).rgba;"
+
+	"   vec3 viewPos = vec3(0, 0, -15);\n"
+	"   vec3 viewDir = normalize(viewPos - FragPos);\n"
+
+	"   vec3 lightPos = viewPos;\n"
+	"   vec3 lightDir = normalize(lightPos - FragPos);\n"
+
+	"   vec3 halfwayDir = normalize(lightDir + viewDir);\n"
+
+	"   float specular = pow(abs(dot(normalize(Normal), halfwayDir)), 32.0);\n"
+	"   float diffuse = abs(dot(normalize(Normal), lightDir));\n"
+
+	"   vec3 result = pow((0.5 + 0.5*diffuse + 1*specular) * Color.rgb, "
+	"vec3(1.0/2.2));\n"
+	"   FragColor = vec4(result, Color.a);\n"
 	"}";

src/gui.c

@@ -0,0 +1,83 @@
+#include <glad.h>
+#include "main.h"
+#define MAX_VERTEX_BUFFER 512 * 1024
+#define MAX_ELEMENT_BUFFER 128 * 1024
+#define NK_INCLUDE_FIXED_TYPES
+#define NK_INCLUDE_STANDARD_IO
+#define NK_INCLUDE_STANDARD_VARARGS
+#define NK_INCLUDE_DEFAULT_ALLOCATOR
+#define NK_INCLUDE_VERTEX_BUFFER_OUTPUT
+#define NK_INCLUDE_FONT_BAKING
+#define NK_INCLUDE_DEFAULT_FONT
+#define NK_IMPLEMENTATION
+#define NK_GLFW_GL3_IMPLEMENTATION
+#include <nuklear.h>
+#include <demo/glfw_opengl3/nuklear_glfw_gl3.h>
+
+struct gui gui =
+{
+	.file_name = {0},
+	.projection = (struct projection){ .mesh=NULL, .x =0, .y=1, .z=2 },
+};
+
+float surface_color[4] = {(float)0x2F/0xFF, (float)0x3C/0xFF, (float)0x7E/0xFF, (float)0xff/0xFF};
+
+
+static inline
+void restore_surface_color( void )
+{
+	gui.picked_color[0] = surface_color[0];
+	gui.picked_color[1] = surface_color[1];
+	gui.picked_color[2] = surface_color[2];
+	gui.picked_color[3] = surface_color[3];
+}
+
+struct nk_glfw glfw ={0};
+struct nk_context * context;
+
+void draw_gui( void )
+{
+	nk_glfw3_new_frame(&glfw);
+
+	if (nk_begin(context, "MANIGRAPH", nk_rect(10, 10, 256, 256),
+			NK_WINDOW_BORDER |NK_WINDOW_SCALABLE | NK_WINDOW_MOVABLE | NK_WINDOW_MINIMIZABLE) )
+	{
+
+		/* Color picker para personalización */
+		{
+			struct nk_colorf * p = (void*)&gui.picked_color;
+			nk_layout_row_dynamic(context, 120, 1);
+			*p = nk_color_picker(context, *p, NK_RGBA);
+		}
+
+		nk_layout_row_dynamic(context, 20, 1);
+		if (nk_button_label(context, "Restablecer"))
+			restore_surface_color();
+
+
+		nk_layout_row_dynamic(context, 12, 1);
+		nk_label(context, (char*)gui.file_name, NK_TEXT_ALIGN_LEFT);
+
+		nk_label_colored(context, "Atajos de teclado:", NK_TEXT_ALIGN_LEFT, nk_rgb(255, 255, 255)); // Encabezado
+		nk_label(context, "  - W/S: Rotar eje X", NK_TEXT_ALIGN_LEFT);
+		nk_label(context, "  - A/D: Rotar eje Y", NK_TEXT_ALIGN_LEFT);
+		nk_label(context, "  - Z/X: Rotar eje Z", NK_TEXT_ALIGN_LEFT);
+	}
+
+	nk_end(context);
+	nk_glfw3_render(&glfw, NK_ANTI_ALIASING_ON, MAX_VERTEX_BUFFER, MAX_ELEMENT_BUFFER);
+}
+
+
+void init_gui( window_t window )
+{
+	struct nk_font_atlas * atlas;
+
+	restore_surface_color();
+
+	{
+		context = nk_glfw3_init(&glfw,(GLFWwindow*) window, NK_GLFW3_DEFAULT );
+		nk_glfw3_font_stash_begin(&glfw, &atlas);
+		nk_glfw3_font_stash_end(&glfw);
+	}
+}

src/input.c

@@ -1,23 +1,90 @@
 #include "main.h"
-#include <cglm/quat.h>
+#include <glad.h>
 #include <GLFW/glfw3.h>
+#include <cglm/quat.h>
+#include <stdio.h>
+#include <string.h>
 
-#define ANGLE ((float)0x01/0xff*2*GLM_PI)
+#define ANGLE ((float)0x01 / 0xff * 2 * GLM_PI)
 
 unsigned char selected_axis = 0;
-int window_width;
+int window_width = 512;
-int window_height;
+int window_height = 512;
+
+unsigned char animate_index = 0;
+extern struct gui gui;
 
 versor q = GLM_QUAT_IDENTITY_INIT;
 
-vec3 axis[3] =
+vec3 axis[3] = {
-{
 	{1, 0, 0},
 	{0, 1, 0},
 	{0, 0, 1},
 };
 
-void __window_callback(GLFWwindow * window, int w, int h)
+
+void __error_callback_input(int x, const char * msg )
+{
+	mlog("[GLFW] ");
+	mlog(msg);
+	mlog("\n");
+}
+
+void __key_callback_input(
+	GLFWwindow *window, int key, int scancode, int action, int mods)
+{
+	if (action != GLFW_PRESS)
+		return;
+
+	if (GLFW_KEY_0 < key && key <= GLFW_KEY_9)
+	{
+		unsigned char selected_coord;
+
+		selected_coord = key - GLFW_KEY_0 - 1;
+
+		if (selected_coord >= gui.projection.m)
+			return;
+		if (selected_coord == gui.projection.x)
+			return;
+		if (selected_coord == gui.projection.y)
+			return;
+		if (selected_coord == gui.projection.z)
+			return;
+
+		selected_coord = gui.projection.w;
+	}
+
+	if (gui.projection.w >= gui.projection.m)
+		return;
+
+	switch (key)
+	{
+		unsigned char tmp;
+	case GLFW_KEY_I:
+		tmp = gui.projection.w;
+		gui.projection.w = gui.projection.x;
+		gui.projection.x = tmp;
+
+		animate_index = 1;
+		break;
+	case GLFW_KEY_O:
+		tmp = gui.projection.w;
+		gui.projection.w = gui.projection.y;
+		gui.projection.y = tmp;
+		animate_index = 2;
+		break;
+	case GLFW_KEY_P:
+		tmp = gui.projection.w;
+		gui.projection.w = gui.projection.z;
+		gui.projection.z = tmp;
+		animate_index = 3;
+		break;
+	}
+
+	return;
+}
+
+void __window_callback_input(GLFWwindow *window, int w, int h)
 {
 	int m;
 
@@ -28,80 +95,108 @@ void __window_callback(GLFWwindow * window, int w, int h)
 	glViewport((w - m) / 2, (h - m) / 2, m, m);
 }
 
-void __mouse_callback(GLFWwindow* window, int button, int action, int mods)
+void __mouse_callback_input(
+	GLFWwindow *window, int button, int action, int mods)
 {
 	unsigned char green_value;
 	double xpos, ypos;
 
-	if( button != GLFW_MOUSE_BUTTON_LEFT || action != GLFW_PRESS )
+	if (button != GLFW_MOUSE_BUTTON_LEFT || action != GLFW_PRESS)
 		return;
 
 	glfwGetCursorPos(window, &xpos, &ypos);
-	glReadPixels((int)xpos, (int)(window_height - ypos), 1, 1, GL_GREEN, GL_UNSIGNED_BYTE, &green_value);
+	glReadPixels((int)xpos, (int)(window_height - ypos), 1, 1, GL_GREEN,
+		GL_UNSIGNED_BYTE, &green_value);
 
-
+	switch (green_value)
-	switch(green_value)
 	{
 	case 0xD3:
 	case 0xD4:
 	case 0xD5:
-		selected_axis = green_value-0xD3;
+		selected_axis = green_value - 0xD3;
 	}
 }
 
-void __scroll_callback(GLFWwindow* window, double xoffset, double yoffset)
+void __scroll_callback_input(GLFWwindow *window, double xoffset, double yoffset)
 {
 	versor p = GLM_QUAT_IDENTITY_INIT;
+	versor r = GLM_QUAT_IDENTITY_INIT;
 
-	glm_quatv(p, yoffset*ANGLE, axis[selected_axis]);
+	// glm_quatv(p, yoffset * ANGLE, axis[selected_axis]);
-
+	glm_quatv(p, yoffset * ANGLE * 2, (vec3){-1, 0, 0});
+	glm_quatv(r, xoffset * ANGLE * 2, (vec3){0, 1, 0});
 	glm_quat_mul(p, q, q);
+	glm_quat_mul(r, q, q);
+
 	glm_quat_rotatev(p, axis[0], axis[0]);
 	glm_quat_rotatev(p, axis[1], axis[1]);
 	glm_quat_rotatev(p, axis[2], axis[2]);
+
+	glm_quat_rotatev(r, axis[0], axis[0]);
+	glm_quat_rotatev(r, axis[1], axis[1]);
+	glm_quat_rotatev(r, axis[2], axis[2]);
+}
+
+void __drop_callback_input(GLFWwindow *window, int count, unsigned char **path)
+{
+	struct surface surface;
+
+	if (create_surface_klein(*path, &surface))
+		return;
+
+	if (!(gui.projection.mesh = create_mesh(surface)))
+		return;
+
+	strcpy(gui.file_name, *path);
+
+	gui.projection.m = surface.dim;
+	set_projection_mesh(gui.projection);
+
+	free(surface.norm);
+	free(surface.data);
 }
 
 quat_t poll_input(window_t window)
 {
 	versor p = GLM_QUAT_IDENTITY_INIT;
 
-	if( glfwGetKey((GLFWwindow*)window, 'Q') == GLFW_PRESS )
+	if (glfwGetKey((GLFWwindow *)window, 'Q') == GLFW_PRESS)
 	{
 		glm_quatv(p, ANGLE, axis[0]);
 		goto end;
 	}
-	if( glfwGetKey((GLFWwindow*)window, 'W') == GLFW_PRESS )
+	if (glfwGetKey((GLFWwindow *)window, 'W') == GLFW_PRESS)
 	{
 		glm_quatv(p, -ANGLE, axis[0]);
 		goto end;
 	}
-	if( glfwGetKey((GLFWwindow*)window, 'A') == GLFW_PRESS )
+	if (glfwGetKey((GLFWwindow *)window, 'A') == GLFW_PRESS)
 	{
 		glm_quatv(p, ANGLE, axis[1]);
 		goto end;
 	}
-	if( glfwGetKey((GLFWwindow*)window, 'S') == GLFW_PRESS )
+	if (glfwGetKey((GLFWwindow *)window, 'S') == GLFW_PRESS)
 	{
 		glm_quatv(p, -ANGLE, axis[1]);
 		goto end;
 	}
-	if( glfwGetKey((GLFWwindow*)window, 'Z') == GLFW_PRESS )
+	if (glfwGetKey((GLFWwindow *)window, 'Z') == GLFW_PRESS)
 	{
 		glm_quatv(p, ANGLE, axis[2]);
 		goto end;
 	}
-	if( glfwGetKey((GLFWwindow*)window, 'X') == GLFW_PRESS )
+	if (glfwGetKey((GLFWwindow *)window, 'X') == GLFW_PRESS)
 	{
 		glm_quatv(p, -ANGLE, axis[2]);
 		goto end;
 	}
 
 end:
-	glm_quat_mul( p, q, q );
+	glm_quat_mul(p, q, q);
-	glm_quat_rotatev( p, axis[0], axis[0] );
+	glm_quat_rotatev(p, axis[0], axis[0]);
-	glm_quat_rotatev( p, axis[1], axis[1] );
+	glm_quat_rotatev(p, axis[1], axis[1]);
-	glm_quat_rotatev( p, axis[2], axis[2] );
+	glm_quat_rotatev(p, axis[2], axis[2]);
-	glm_quat_normalize( q );
+	glm_quat_normalize(q);
+
 	return q;
 }
-

src/klein.c

@@ -0,0 +1,44 @@
+#include "main.h"
+
+#include <stdio.h>
+
+/*
+	KLEIN Format:
+		5 bytes with KLEIN
+		1 byte empty for scaling
+		1 byte with the dimention of the surface
+		8 bytes interprated as a long with the number of vertex
+		n bytes with the vertex data of the surface
+		n bytes with the normal data of the surface
+
+	where n is the size of the vertex and normal data that could be 
+	calculated as the dimention of the surface  time the number of vertes 
+	time the size of a 16 bytes float.
+*/
+
+int create_surface_klein(unsigned char *path, struct surface *surface)
+{
+	unsigned long size;
+	char buffer[5];
+	FILE *file = fopen(path, "rb");
+	if (!file)
+		return 1;
+
+	fread(buffer, 1, 5, file);
+
+	if (strncmp(buffer, "KLEIN", 5))
+		return 1;
+
+	fread(buffer, 1, 1, file);
+	fread(&surface->dim, 1, 1, file);
+	fread(&surface->vertex, 8, 1, file);
+
+	size = surface->dim * surface->vertex;
+
+	surface->data = malloc(4 * size);
+	fread(surface->data, 4, size, file);
+
+	surface->norm = malloc(4 * size);
+	fread(surface->norm, 4, size, file);
+	return 0;
+}

src/load.c

@@ -0,0 +1,28 @@
+#include "main.h"
+#include <cglm/cam.h>
+#include <cglm/mat4.h>
+#include <cglm/quat.h>
+
+void fix_matrix_load(id_t shader, float ratio)
+{
+	mat4 m, n;
+	const int d = 7;
+
+	glm_lookat((vec3){0, 0, -d}, (vec3){0, 0, 0}, (vec3){0, 1, 0}, m);
+	glm_perspective(CGLM_PI / 6, ratio, d - 3, d + 3, n);
+	glm_mat4_mul(n, m, m);
+
+	load_mat4_to_shader(shader, "fix", (mat4_t)m);
+}
+
+void rot_matrix_load(id_t shader, quat_t q)
+{
+	mat4 m;
+	glm_quat_mat4(q, m);
+	load_mat4_to_shader(shader, "rot", (mat4_t)m);
+}
+
+void color_load(id_t shader, float res[4])
+{
+	load_float4_to_shader(shader, "color", res);
+}

src/main.c

@@ -1,88 +1,179 @@
 #include "main.h"
-#include "data/cube.h"
-#include "data/axis.h"
 #include "data/shaders.h"
-#include <GL/glew.h>
+
+#include <stdio.h>
+#include <stdlib.h>
 
 #define WIDTH 512
 #define HEIGHT 512
 
-unsigned char palette[] =
+#include <glad.h>
+
+float *generate_data_surface(unsigned int, unsigned char *);
+float *generate_normals_surface(float *, unsigned char);
+
+#ifdef EMSCRIPTEN
+#include <emscripten.h>
+#endif
+
+#ifndef M_PI
+#define M_PI 3.14159
+#endif
+
+window_t window;
+id_t shader, shader_plain;
+
+const char *wname = "manigraph: manifold grapher";
+
+extern volatile unsigned char animate_index;
+extern struct gui gui;
+
+void mlog(char *msg)
 {
-	16,
+#ifdef DEBUG
-	0xEB,0xD3,0xF8,0xff,
+	printf(msg);
-	0xEB,0xD4,0xF8,0xff,
+#endif
-	0xEB,0xD5,0xF8,0xff,
+}
-	0x7A,0x1C,0xAC,0xff,
-};
 
-const char * wname = "manigraph: manifold grapher";
+#ifndef EMSCRIPTEN
+static inline
+#endif
 
-int main( void )
+	void
+	main_loop(void)
 {
-	id_t shader, texture;
-	mesh_t m_cube, m_axis;
-	window_t window;
-
-	if( !( window = init_window( WIDTH, HEIGHT, wname ) ) )
-		goto error_window;
-
-	use_window( window );
-	set_clean_color_context( 0x2E, 0x07, 0x3F );
-
-	glewInit(); 
-
-	if( !( shader = create_shader() ) )
-		goto error_shader;
-
-	gload_program( shader, vs, VERTEX );
-	gload_program( shader, fs, FRAGMENT );
-	use_shader( shader );
-
-	load_fix_matrix( shader, (float)WIDTH/HEIGHT );
-
-	if( !( m_cube = create_mesh( d_cube ) ) )
-		goto error_mesh_cube; 
-
-	if( !( m_axis = create_mesh( d_axis ) ) )
-		goto error_mesh_axis; 
-
-	texture=create_palette_texture( palette );
-	use_texture( texture );
-
-	while( is_open_window( window ) )
-	{
 	quat_t q;
 
-		q=poll_input( window );
+	q = poll_input(window);
-		load_rot_matrix( shader, q );
 
-		clean_context();
+	gui.quat[0] = q[0];
-#ifndef DEBUG
+	gui.quat[1] = q[1];
-		load_mdl_matrix( shader, 0, 0 );
+	gui.quat[2] = q[2];
-		draw_mesh( m_axis );
+	gui.quat[3] = q[3];
-		load_mdl_matrix( shader, 1, 1 );
+
-		draw_mesh( m_axis );
+
-		load_mdl_matrix( shader, 2, 2 );
+	rot_matrix_load(shader, q);
-		draw_mesh( m_axis );
+	rot_matrix_load(shader_plain, q);
-#endif
+	color_load(shader, gui.picked_color);
-		load_mdl_matrix( shader, 0, 3 );
+	color_load(shader_plain, gui.picked_color);
-		draw_mesh( m_cube );
+
+	{
+		static float angle = 0;
+
+		if (angle > M_PI / 2)
+		{
+			animate_index = 0;
+			angle = 0;
+
+			load_float_to_shader(shader, "angle", angle);
+			load_float_to_shader(shader_plain, "angle", angle);
+			set_projection_mesh(gui.projection);
 		}
 
-	destroy_texture( texture );
+		if (animate_index)
-	destroy_mesh( m_axis );
+		{
-	destroy_mesh( m_cube );
+			load_float_to_shader(shader, "i", animate_index - 1);
-	destroy_shader( shader );
+			load_float_to_shader(shader_plain, "i", animate_index - 1);
-	close_window( window );
+
+			angle += 0.01;
+			load_float_to_shader(shader, "angle", angle);
+			load_float_to_shader(shader_plain, "angle", angle);
+		}
+	}
+	clean_context();
+
+
+	if (gui.projection.mesh)
+	{
+		draw_mesh(shader, gui.projection.mesh);
+		draw_mesh_lines(shader_plain, gui.projection.mesh);
+	}
+
+	draw_gui();
+	
+}
+
+int main(void)
+{
+	mlog("[VENTANA] Inicializando...\n");
+	{
+		if (!(window = init_window(WIDTH, HEIGHT, wname)))
+		{
+			mlog("[VENTANA] Error al inicializar...\n");
+			goto error_window;
+		}
+
+		use_window(window);
+	}
+
+	mlog("[CONTEXT] Inicializando...\n");
+	{
+		if (!(init_context()))
+		{
+			mlog("[CONTEXT] Error al inicializar...\n");
+			goto error_context;
+		}
+		set_clean_color_context(0xFF, 0xFF, 0xFF);
+	}
+
+	mlog("[SHADER] Inicializando...\n");
+	{
+		if (!(shader = create_shader()))
+		{
+			mlog("[SHADER] Error al inicializar...\n");
+			goto error_shader;
+		}
+		load_program_to_shader(shader, vs, VERTEX);
+		load_program_to_shader(shader, fs, FRAGMENT);
+		fix_matrix_load(shader, (float)WIDTH / HEIGHT);
+	}
+
+	mlog("[SHADER] Inicializando...\n");
+	{
+		if (!(shader_plain = create_shader()))
+		{
+			mlog("[SHADER] Error al inicializar...\n");
+			goto error_shader_plain;
+		}
+		load_program_to_shader(shader_plain, vs, VERTEX);
+		load_program_to_shader(shader_plain, fs_plain, FRAGMENT);
+		fix_matrix_load(shader_plain, (float)WIDTH / HEIGHT);
+	}
+
+	mlog("[GUI] Inicializando...\n");
+	{
+		init_gui(window);
+	}
+
+	mlog("[MAIN LOOP] Inicializando...\n");
+#ifdef EMSCRIPTEN
+	emscripten_set_main_loop(&main_loop, 60, 1);
+	return 0;
+#else
+	while (is_open_window(window))
+		main_loop();
+#endif
+	mlog("[MAIN LOOP] Terminando...\n");
+
+	mlog("[MESH] Destruyendo...\n");
+	destroy_mesh(gui.projection.mesh);
+	mlog("[SHADER] Destruyendo...\n");
+	destroy_shader(shader_plain);
+	mlog("[SHADER] Destruyendo...\n");
+	destroy_shader(shader);
+	mlog("[WINDOW] Destruyendo...\n");
+	close_window(window);
 	return 0;
 
-error_mesh_axis:
+error_context:
-	destroy_mesh( m_cube );
+	mlog("[SHADER] Destruyendo...\n");
-error_mesh_cube:
+	destroy_shader(shader);
-	destroy_shader( shader );
 error_shader:
-	close_window( window );
+	mlog("[SHADER] Destruyendo...\n");
+	destroy_shader(shader_plain);
+error_shader_plain:
+	mlog("[WINDOW] Destruyendo...\n");
+	close_window(window);
 error_window:
 	return 1;
 }

src/main.h

@@ -1,21 +1,67 @@
-#include <GL/glew.h>
+/*
-#include <GLFW/glfw3.h>
+	If DEBUG is set, we show the triangles of the mesh,
+	without illumination, and we write the compilation
+	error of the shaders.
+*/
 
-typedef const void * window_t;
+#define DEBUG
+#define GLFW_INCLUDE_NONE
+
+typedef const void *window_t;
 typedef unsigned int id_t;
-typedef void * mesh_t;
+typedef void *mesh_t;
-typedef float * quat_t;
+typedef float *quat_t;
-typedef float * mat4_t;
+typedef float *mat4_t;
 
-typedef float narray_float_t[];
+/*
-typedef unsigned char narray_u8_t[];
+	This struct represent the proyection, where:
+		mesh: data of surface.
+		m: the dimention of the surface.
+		x: the coordanate of the x axis.
+		y: the coordanate of the y axis.
+		z: the coordanate of the z axis.
+		w: the coordanate of the w axis.
+*/
 
-enum
+struct gui
 {
-	VERTEX, FRAGMENT
+	float quat[4];
+	float picked_color[4];
+	char file_name[0xff];
+	struct projection
+	{
+		mesh_t mesh;
+		unsigned char m, x, y, z, w;
+	} projection;
 };
 
-window_t init_window(unsigned int w, unsigned int h, const char * name);
+
+/*
+	this structure has all the information to generate
+	a mesh, where:
+		data: the buffer with the vertex coords
+		norm: the buffer with the norm coords
+		vertex: the number of vertex
+		dim: the dimentions of the surface
+*/
+
+struct surface
+{
+	float *data, *norm;
+	unsigned long vertex;
+	unsigned char dim;
+};
+
+/*
+	Init window:
+		w: default width;
+		h: default height;
+		name: Name of the window.
+*/
+
+int create_surface_klein( unsigned char *, struct surface *  );
+
+window_t init_window(unsigned int w, unsigned int h, const char *name);
 
 void use_window(window_t window);
 
@@ -23,33 +69,109 @@ int is_open_window(window_t window);
 
 void close_window(window_t window);
 
-mesh_t create_mesh(narray_float_t mesh);
+/*
+	Create mesh:
+		d: array of floats with the vertex data.
+		n: array of floats with the normal data.
+		m: Dimention of mesh
+*/
+
+mesh_t create_mesh(struct surface);
+
+void set_projection_mesh(struct projection);
 
 void destroy_mesh(mesh_t p);
 
-void draw_mesh(mesh_t p);
+void draw_mesh(id_t, mesh_t p);
 
-void set_clean_color_context(unsigned char, unsigned char, unsigned char);
+void draw_mesh_lines(id_t, mesh_t p);
+
+/*
+	Set background color:
+		r: red value in hex.
+		g: green value in hex.
+		b: blue value in hex.
+*/
+
+void set_clean_color_context(unsigned char r, unsigned char g, unsigned char b);
 
 void clean_context(void);
 
+int init_context(void);
+
 void destroy_shader(id_t shader);
 
 id_t create_shader(void);
 
-void use_shader(id_t program);
+void use_shader(id_t shader);
 
-unsigned char gload_program(id_t program, const char * src, unsigned int type);
+enum
+{
+	VERTEX,
+	FRAGMENT
+};
 
-void gload_float(id_t program, char * var, float f);
+/*
+	Load program to shader:
+		src: GLSL source code as string.
+		type: VERTEX or FRAGMENT
+*/
 
-void gload_mat4(id_t program, char * var, mat4_t m);
+unsigned char load_program_to_shader(
+	id_t shader, const char *src, unsigned int type);
 
-void load_fix_matrix(id_t shader, float ratio);
+/*
+	load float to shader:
+		var: name of glsl variable.
+		f: float to load
+*/
 
-void load_mdl_matrix(id_t shader, unsigned char i, unsigned char c);
+void load_float_to_shader(id_t shader, char *var, float f);
 
-void load_rot_matrix(id_t shader, quat_t q);
+/*
+	load unsigned int to shader:
+		var: name of glsl variable.
+		u: unsigned int to load
+*/
+
+void load_uint_to_shader(id_t shader, char *var, unsigned int u);
+
+/*
+	load float[4] to shader:
+		var: name of glsl variable.
+		f: float[4] to load
+*/
+
+void load_float4_to_shader(id_t shader, char *var, float f[4]);
+
+/*
+	load matrix 4 to shader:
+		var: name of glsl variable.
+		m: Matrix to load
+*/
+
+void load_mat4_to_shader(id_t shader, char *var, mat4_t m);
+
+/*
+	Generate and load fix matrix, this matrix
+	has the information of the perspective and
+	camera information.
+
+		ratio: default ratio of window.
+*/
+void fix_matrix_load(id_t shader, float ratio);
+
+/*
+	Generate and load rotation matrix.
+		q: quaterinon describing the rotation.
+*/
+
+void rot_matrix_load(id_t shader, quat_t q);
+
+/*
+ */
+
+void color_load(id_t shader, float* color);
 
 id_t config_texture(unsigned short type);
 
@@ -57,6 +179,14 @@ void use_texture(id_t texture);
 
 void destroy_texture(id_t texture);
 
-id_t create_palette_texture(const narray_u8_t colors);
+/*
+	Set color palette as texture:
+		colors: array of color values (rgba in hex ).
+		n: number of color on colors.
+*/
+id_t create_palette_texture(const unsigned char colors[][4], unsigned char n);
 
 quat_t poll_input(window_t window);
+
+void draw_gui( void );
+void init_gui(  window_t window );

src/matrix.c

@@ -1,51 +0,0 @@
-#include "main.h"
-#include <cglm/mat4.h>
-#include <cglm/cam.h>
-#include <cglm/quat.h>
-
-mat4 ortho[] =
-{
-	{
-		{ 1, 0, 0, 0 },
-		{ 0, 1, 0, 0 },
-		{ 0, 0, 1, 0 },
-		{ 0, 0, 0, 1 },
-	},
-	{
-		{ 0, 1, 0, 0 },
-		{ 1, 0, 0, 0 },
-		{ 0, 0, 1, 0 },
-		{ 0, 0, 0, 1 },
-	},
-	{
-		{ 0, 0, 1, 0 },
-		{ 0, 1, 0, 0 },
-		{ 1, 0, 0, 0 },
-		{ 0, 0, 0, 1 },
-	},
-};
-
-void load_fix_matrix( id_t shader, float ratio )
-{
-	mat4 m, n;
-	const int d = 7;
-
-	glm_lookat( (vec3){0,0,-d}, (vec3){0,0,0}, (vec3){0,1,0}, m );
-	glm_perspective( CGLM_PI/4, ratio, d-3, d+3, n );
-	glm_mat4_mul( n, m, m );
-
-	gload_mat4( shader, "fix", (mat4_t) m );
-}
-
-void load_mdl_matrix( id_t shader, unsigned char i, unsigned char c )
-{
-	gload_float( shader, "idx", c );
-	gload_mat4( shader, "mdl", (mat4_t)ortho[i] );
-}
-
-void load_rot_matrix( id_t shader, quat_t q )
-{
-	mat4 m;
-	glm_quat_mat4( q, m );
-	gload_mat4( shader, "rot", (mat4_t)m );
-}

src/mesh.c

@@ -1,55 +1,118 @@
 #include "main.h"
-#include <GL/glew.h>
+
+#ifdef EMSCRIPTEN
+#include <GL/gl.h>
+#else
+#include <glad.h>
+#endif
+
+#include <stdio.h>
 #include <stdlib.h>
 
 struct obj
 {
-	unsigned int vertex, vao, vbo;
+	unsigned int vertex, vao, n_vbo, d_vbo;
 };
 
-mesh_t create_mesh( narray_float_t mesh )
+void set_projection_mesh(struct projection projection)
 {
-	struct obj * p;
+	struct obj *p;
+	p = projection.mesh;
 
-	p=malloc(sizeof(struct obj));
+	glBindVertexArray(p->vao);
 
-	p->vertex=(*mesh)/3;
+	glBindBuffer(GL_ARRAY_BUFFER, p->d_vbo);
+	glVertexAttribPointer(0, 1, GL_FLOAT, 0, projection.m * sizeof(float),
+		(float *)(projection.x * sizeof(float)));
+	glVertexAttribPointer(1, 1, GL_FLOAT, 0, projection.m * sizeof(float),
+		(float *)(projection.y * sizeof(float)));
+	glVertexAttribPointer(2, 1, GL_FLOAT, 0, projection.m * sizeof(float),
+		(float *)(projection.z * sizeof(float)));
+	glVertexAttribPointer(3, 1, GL_FLOAT, 0, projection.m * sizeof(float),
+		(float *)(projection.w * sizeof(float)));
 
-	glGenVertexArrays( 1, &p->vao );
+	glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, p->n_vbo);
-	glGenBuffers( 1, &p->vbo );
+	glVertexAttribPointer(4, 1, GL_FLOAT, 0, projection.m * sizeof(float),
+		(float *)(projection.x * sizeof(float)));
+	glVertexAttribPointer(5, 1, GL_FLOAT, 0, projection.m * sizeof(float),
+		(float *)(projection.y * sizeof(float)));
+	glVertexAttribPointer(6, 1, GL_FLOAT, 0, projection.m * sizeof(float),
+		(float *)(projection.z * sizeof(float)));
+	glVertexAttribPointer(7, 1, GL_FLOAT, 0, projection.m * sizeof(float),
+		(float *)(projection.w * sizeof(float)));
+}
 
-	glBindVertexArray( p->vao );
+/*
-	glBindBuffer( GL_ARRAY_BUFFER, p->vbo );
+	In this function we load all the vertex and ELEMENT_ARRAY datas on two
-	glBufferData( GL_ARRAY_BUFFER, (p->vertex*3)*sizeof(int), mesh+1, 
+	diferents buffers, so we can access the coordanates that we want
-		GL_STATIC_DRAW );
+	to display using the layout location in GLSL.
+	This trick can be done with glVertexAttribPointer.
+*/
 
-	glVertexAttribPointer( 0,3,GL_FLOAT, 0, 3*sizeof(int), NULL );
+mesh_t create_mesh(struct surface surface)
-	glEnableVertexAttribArray(0);
+{
+	unsigned char i;
+	struct obj *p;
+
+	p = malloc(sizeof(struct obj));
+
+	p->vertex = surface.vertex;
+
+	glGenVertexArrays(1, &p->vao);
+	glBindVertexArray(p->vao);
+
+	glGenBuffers(1, &p->d_vbo);
+	glBindBuffer(GL_ARRAY_BUFFER, p->d_vbo);
+	glBufferData(GL_ARRAY_BUFFER, p->vertex * surface.dim * sizeof(float),
+		surface.data, GL_STATIC_DRAW);
+
+	if (surface.norm)
+	{
+		glGenBuffers(1, &p->n_vbo);
+		glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, p->n_vbo);
+		glBufferData(GL_ELEMENT_ARRAY_BUFFER,
+			p->vertex * surface.dim * sizeof(float), surface.norm,
+			GL_STATIC_DRAW);
+	}
+
+	for (i = 0; i < 8; ++i)
+		glEnableVertexAttribArray(i);
 
 	return p;
 }
 
-void destroy_mesh( mesh_t p )
+void destroy_mesh(mesh_t p)
 {
-	struct obj * obj ;
+	struct obj *obj;
 	obj = p;
-	glDeleteVertexArrays( 1, &obj->vao );
+	glDeleteVertexArrays(1, &obj->vao);
-	glDeleteBuffers( 1, &obj->vbo );
+	glDeleteBuffers(1, &obj->d_vbo);
-	free( p );
+	glDeleteBuffers(1, &obj->n_vbo);
+	free(p);
 }
 
-void draw_mesh( mesh_t p )
+void draw_mesh(id_t shader, mesh_t p)
 {
-	struct obj * obj=p;
+	struct obj *obj = p;
 
-	glBindVertexArray( obj->vao );
+	glUseProgram(shader);
-#ifdef DEBUG
+	glBindVertexArray(obj->vao);
-	{
+#ifndef EMSCRIPTEN
-		int i;
+	glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
-		for( i=0; i<obj->vertex;i+=3 )
+#endif
-			glDrawArrays(GL_LINE_LOOP, i, 3 );
+	glDrawArrays(GL_TRIANGLES, 0, obj->vertex);
-	}
+}
+void draw_mesh_lines(id_t shader, mesh_t p)
+{
+	struct obj *obj = p;
+
+	glUseProgram(shader);
+	glBindVertexArray(obj->vao);
+#ifndef EMSCRIPTEN
+	glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
+	glDrawArrays(GL_TRIANGLES, 0, obj->vertex);
+	glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
 #else
-	glDrawArrays(GL_TRIANGLES, 0, obj->vertex );
+	glDrawArrays(GL_LINES, 0, obj->vertex);
 #endif
 }

src/shader.c

@@ -1,51 +1,43 @@
 #include "main.h"
-#include <GL/glew.h>
+
+#ifndef EMSCRIPTEN
+#include <glad.h>
+#else
+#include <GL/gl.h>
+#endif
 
 #ifdef DEBUG
 #include <stdio.h>
 #endif
 
-void destroy_shader( unsigned int shader )
+void destroy_shader(unsigned int shader) { glDeleteProgram(shader); }
-{ 
-	return glDeleteProgram( shader );
-}
 
-unsigned int create_shader( void )
+unsigned int create_shader(void) { return glCreateProgram(); }
-{
-	return glCreateProgram();
-}
 
-void use_shader( unsigned int program )
+void use_shader(unsigned int program) { glUseProgram(program); }
-{
-	return glUseProgram( program );
-}
 
-unsigned char gload_program( unsigned int program, const char * src, 
+unsigned char load_program_to_shader(
-	unsigned int i )
+	unsigned int program, const char *src, unsigned int i)
 {
 	int shader, status;
-	unsigned int type[] = 
+	unsigned int type[] = {
-	{
+		[VERTEX] = GL_VERTEX_SHADER, [FRAGMENT] = GL_FRAGMENT_SHADER};
-		[VERTEX]=GL_VERTEX_SHADER,
-		[FRAGMENT]=GL_FRAGMENT_SHADER 
-	};
 
-
+	if (!src)
-	if( !src )
 		return 0;
 
 	shader = glCreateShader(type[i]);
-	glShaderSource( shader, 1, (const GLchar **)&src, ((void*)0 ));
+	glShaderSource(shader, 1, (const GLchar **)&src, ((void *)0));
 	glCompileShader(shader);
-	glGetShaderiv( shader, GL_COMPILE_STATUS, &status );
 
+	glGetShaderiv(shader, GL_COMPILE_STATUS, &status);
 
-	if( !status )
+	if (!status)
 	{
 #ifdef DEBUG
 		char log[256];
-		glGetShaderInfoLog( shader, 256, NULL, log );
+		glGetShaderInfoLog(shader, 256, NULL, log);
-		printf( "%s", log );
+		printf("%s", log);
 #endif
 		return 0;
 	}
@@ -56,14 +48,21 @@ unsigned char gload_program( unsigned int program, const char * src,
 	return 1;
 }
 
-void gload_float( unsigned int program, char * var, float f )
+void load_float_to_shader(unsigned int program, char *var, float f)
 {
-	glUseProgram( program );
+	glUseProgram(program);
-	glUniform1f( glGetUniformLocation( program, var ), f ); 
+	glUniform1f(glGetUniformLocation(program, var), f);
 }
 
-void gload_mat4( unsigned int program, char * var, float * mat )
+void load_mat4_to_shader(unsigned int program, char *var, float *mat)
 {
-	glUseProgram( program );
+	glUseProgram(program);
-	glUniformMatrix4fv( glGetUniformLocation( program, var ), 1, 0, mat ); 
+	glUniformMatrix4fv(glGetUniformLocation(program, var), 1, 0, mat);
+}
+
+void load_float4_to_shader(unsigned int program, char *var, float float4[4])
+{
+	glUseProgram(program);
+	glUniform4f(glGetUniformLocation(program, var), float4[0], float4[1],
+		float4[2], float4[3]);
 }

src/texture.c

@@ -1,37 +0,0 @@
-#include "main.h"
-#include <GL/glew.h>
-
-#define TYPE GL_TEXTURE_2D_ARRAY
-
-id_t config_texture( unsigned short type )
-{
-	id_t texture;
-
-	glGenTextures( 1, &texture );
-	glBindTexture( TYPE, texture );
-
-	{
-		glTexParameteri( TYPE, GL_TEXTURE_MIN_FILTER, GL_NEAREST );
-		glTexParameteri( TYPE, GL_TEXTURE_MAG_FILTER, GL_NEAREST );
-	}
-
-	return texture;
-}
-
-void use_texture( id_t texture )
-{
-	return glBindTexture( TYPE, texture );
-}
-
-void destroy_texture( unsigned int texture )
-{
-	return glDeleteTextures( 1, &texture );
-}
-
-id_t create_palette_texture( const unsigned char * colors )
-{
-	id_t texture = config_texture( TYPE );
-	glTexImage3D( TYPE, 0, GL_RGBA,
-		1, 1, (*colors)/4, 0, GL_RGBA, GL_UNSIGNED_BYTE, colors+1);
-	return texture;
-}

src/window.c

@@ -1,55 +1,96 @@
 #include "main.h"
 #include <GLFW/glfw3.h>
+#include <stdio.h>
+#include <time.h>
 
-void __window_callback(GLFWwindow *, int, int);
+void __window_callback_input(GLFWwindow *, int, int);
-void __mouse_callback(GLFWwindow *, int, int, int);
+void __mouse_callback_input(GLFWwindow *, int, int, int);
-void __scroll_callback(GLFWwindow *, double, double);
+void __scroll_callback_input(GLFWwindow *, double, double);
+void __key_callback_input(GLFWwindow *, int, int, int, int);
+void __drop_callback_input(GLFWwindow *, int, const char **);
+void __error_callback_input(int, const char *);
 
-window_t init_window(unsigned int w, unsigned int h, const char * name)
+window_t init_window(unsigned int w, unsigned int h, const char *name);
+
+/*
+	Limitamos los FPS, contando el tiempo en el que
+	se ejecuta el main loop, y esperando el tiempo restante
+	para lograr los fps deseados.
+*/
+
+static void __limit_fps_window(int max_fps)
 {
-	void * window;
+	static double previous_time = 0.0;
-	void __mouse_callback(GLFWwindow *window, int button, int action, int mods);
+	double current_time;
-	void __scroll_callback(GLFWwindow *window, double xoffset, double yoffset);
+	double frame_time;
+	double elapsed_time;
 
-	if( !glfwInit() )
+	current_time = glfwGetTime();
+	frame_time = 1.0 / max_fps;
+	elapsed_time = current_time - previous_time;
+
+	if (elapsed_time < frame_time)
+	{
+		struct timespec sleep_time;
+		sleep_time.tv_sec = 0;
+		sleep_time.tv_nsec = (long)((frame_time - elapsed_time) * 1e9);
+		nanosleep(&sleep_time, NULL);
+
+		current_time = glfwGetTime();
+	}
+
+	previous_time = current_time;
+}
+
+window_t init_window(unsigned int width, unsigned int height, const char *title)
+{
+	window_t window;
+	glfwSetErrorCallback(__error_callback_input);
+
+	if (!glfwInit())
 		return NULL;
 
 	glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
 	glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
 	glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
+	glfwWindowHint(GLFW_OPENGL_DEBUG_CONTEXT, 1); 
 
-	window = glfwCreateWindow(w, h, name, NULL, NULL);
+	window = (window_t)glfwCreateWindow(width, height, title, NULL, NULL);
-
+	if (!(window))
-	if( !window )
 	{
 		glfwTerminate();
 		return NULL;
 	}
 
-	glfwSetWindowSizeCallback(window, __window_callback);
+	glfwMakeContextCurrent((GLFWwindow *)(window));
-	glfwSetMouseButtonCallback((GLFWwindow*)window, __mouse_callback);
-	glfwSetScrollCallback((GLFWwindow*)window, __scroll_callback);
 
-	__window_callback( window, w, h );
+	glfwSetWindowSizeCallback((GLFWwindow *)window, __window_callback_input);
+	glfwSetMouseButtonCallback((GLFWwindow *)window, __mouse_callback_input);
+	glfwSetScrollCallback((GLFWwindow *)window, __scroll_callback_input);
+	glfwSetKeyCallback((GLFWwindow *)window, __key_callback_input);
+	glfwSetDropCallback((GLFWwindow *)window, __drop_callback_input);
 
 	return window;
 }
 
-void use_window(window_t window)
+void use_window(window_t window) { glfwMakeContextCurrent((void *)window); }
-{
+
-	glfwMakeContextCurrent((void*)window);
+extern int window_width, window_height;
-}
 
 int is_open_window(window_t window)
 {
-	glfwSwapBuffers((void*)window);
+	/* Restore window proportions if Nuklear breaks it */
+	__window_callback_input((GLFWwindow *)window, window_width, window_height);
+
+	glfwSwapBuffers((void *)window);
 	glfwPollEvents();
 
-	return !glfwWindowShouldClose((void*)window);
+	__limit_fps_window(60);
+	return !glfwWindowShouldClose((void *)window);
 }
 
 void close_window(window_t window)
 {
-	glfwDestroyWindow((void*)window);
+	glfwDestroyWindow((GLFWwindow *)window);
 	glfwTerminate();
 }