Fix compilation

Makefile

@@ -2,19 +2,23 @@ BIN = manigraph
 
 OBJ = \
 	ext/glad/glad.o \
-	src/surface.o \
 	src/context.o \
 	src/window.o \
-	src/load.o \
 	src/shader.o \
+	src/klein.o \
 	src/input.o \
+	src/load.o \
 	src/mesh.o \
 	src/main.o 
 
+EXAMPLES = \
+	example/basic.o
+
 CFLAGS = \
 	-I./ext/cglm/include  \
 	-I./ext/glfw/include  \
 	-I./ext/glad  \
+	-I./include  \
 	-Wall -Wno-unused-function -std=c99 -D_GNU_SOURCE \
 
 WAYLAND-LIB = \
@@ -38,7 +42,7 @@ help:
 	@echo "Clean"
 	@echo "	$(MAKE) clean"
 
-src/main.o: src/data/axis.h src/data/shaders.h
+src/main.o: src/data/shaders.h
 
 windows: $(OBJ) 
 	cd ext; $(MAKE) -f glfw.mk windows; cd -
@@ -72,6 +76,8 @@ clean:
 	cd ext; $(MAKE) -f glfw.mk clean; cd -
 
 
+examples: $(EXAMPLES)
+
 .SUFFIXES: .c .o 
 
 .c.o:

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/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 = 4;
+
+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, "%03d-cube.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;
+}

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, 16, klein.vertex_size * klein.dim, file);
+	fwrite(klein.normals, 16, klein.vertex_size * klein.dim, file);
+
+	fclose(file);
+	return 0;
+}
+#endif

include/klein/norm.h

@@ -0,0 +1,118 @@
+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);
+}

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/data/axis.h

@@ -1,40 +0,0 @@
-#undef A
-#undef B 
-#undef C 
-#undef D
-#undef E
-#undef F
-#undef G 
-#undef H
-
-#define A -2.0,-0.05,-0.05,
-#define B -2.0,-0.05, 0.05,
-#define C -2.0, 0.05,-0.05,
-#define D -2.0, 0.05, 0.05,
-#define E  2.0,-0.05,-0.05,
-#define F  2.0,-0.05, 0.05,
-#define G  2.0, 0.05,-0.05,
-#define H  2.0, 0.05, 0.05,
-
-float d_axis[] =
-{
-	3*3*2*6,
-
-	A C E
-	G E C
-
-	E G F
-	H F G
-
-	F H B
-	D B H
-
-	B D A
-	C A D 
-
-	C D G
-	H G D
-
-	E B A
-	B E F
-};

src/input.c

@@ -9,7 +9,7 @@ unsigned char selected_axis = 0;
 int window_width;
 int window_height;
 
-unsigned char animate_index=0;
+unsigned char animate_index = 0;
 
 versor q = GLM_QUAT_IDENTITY_INIT;
 
@@ -56,23 +56,22 @@ void __key_callback_input(
 		projection.w = projection.x;
 		projection.x = tmp;
 
-		animate_index=1;
+		animate_index = 1;
 		break;
 	case GLFW_KEY_O:
 		tmp = projection.w;
 		projection.w = projection.y;
 		projection.y = tmp;
-		animate_index=2;
+		animate_index = 2;
 		break;
 	case GLFW_KEY_P:
 		tmp = projection.w;
 		projection.w = projection.z;
 		projection.z = tmp;
-		animate_index=3;
+		animate_index = 3;
 		break;
 	}
 
-
 	return;
 }
 
@@ -114,9 +113,9 @@ 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 * 2, (vec3){-1,0,0});
-	glm_quatv(r, xoffset * ANGLE * 2, (vec3){0,1,0});
+	// 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);
 
@@ -129,6 +128,23 @@ void __scroll_callback_input(GLFWwindow *window, double xoffset, double yoffset)
 	glm_quat_rotatev(r, axis[2], axis[2]);
 }
 
+void __drop_callback_input(GLFWwindow *window, int count, char **path)
+{
+	struct surface surface;
+
+	if (create_surface_klein(*path, &surface))
+		return;
+
+	if (!(projection.mesh = create_mesh(surface)))
+		return;
+
+	projection.m = surface.dim;
+	set_projection_mesh(projection);
+
+	free(surface.norm);
+	free(surface.data);
+}
+
 quat_t poll_input(window_t window)
 {
 	versor p = GLM_QUAT_IDENTITY_INIT;
@@ -172,10 +188,11 @@ end:
 	glm_quat_normalize(q);
 
 	// LOG INFO
-	if(0)
+	if (0)
 	{
 		printf("QUAT: %2.5f %2.5f %2.5f %2.5f\n", q[0], q[1], q[2], q[3]);
-		printf("PROY: %3d %3d %3d (%3d)\n", projection.x, projection.y, projection.z, projection.w );
+		printf("PROY: %3d %3d %3d (%3d)\n", projection.x, projection.y,
+			projection.z, projection.w);
 		printf("\n");
 	}
 	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(16 * size);
+	fread(surface->data, 16, size, file);
+
+	surface->norm = malloc(16 * size);
+	fread(surface->norm, 16, size, file);
+	return 0;
+}

src/main.c

@@ -15,10 +15,7 @@
 #define M_PI 3.14159
 #endif
 
-float *generate_data_surface(unsigned char *, unsigned long *);
-float *generate_normals_surface(float *, unsigned char, unsigned long);
-
-struct projection projection = {.x = 0, .y = 1, .z = 2, .w = 3};
+struct projection projection = {.x = 0, .y = 1, .z = 2, .w = 3, .mesh = NULL};
 
 const char *wname = "manigraph: manifold grapher";
 
@@ -32,7 +29,6 @@ void mlog(char *msg)
 }
 
 window_t window;
-mesh_t m_surface;
 id_t shader, shader_plain;
 
 extern volatile unsigned char animate_index;
@@ -78,8 +74,11 @@ static inline
 	}
 	clean_context();
 
-	draw_mesh(shader, m_surface);
-	draw_mesh_lines(shader_plain, m_surface);
+	if (!projection.mesh)
+		return;
+
+	draw_mesh(shader, projection.mesh);
+	draw_mesh_lines(shader_plain, projection.mesh);
 }
 
 int main(void)
@@ -130,29 +129,6 @@ int main(void)
 		fix_matrix_load(shader_plain, (float)WIDTH / HEIGHT);
 	}
 
-	mlog("[MESH] Inicializando...\n");
-	{
-		struct surface surface;
-
-		surface.data = generate_data_surface(&surface.dim, &surface.vertex);
-		surface.norm =
-			generate_normals_surface(surface.data, surface.dim, surface.vertex);
-
-		if (!(m_surface = create_mesh(surface)))
-		{
-			mlog("[MESH] Error al inicializar...\n");
-			goto error_mesh_surface;
-		}
-
-		projection.m = surface.dim;
-		projection.mesh = m_surface;
-
-		set_projection_mesh(projection);
-
-		free(surface.norm);
-		free(surface.data);
-	}
-
 	mlog("[MAIN LOOP] Inicializando...\n");
 #ifdef EMSCRIPTEN
 	emscripten_set_main_loop(&main_loop, 60, 1);
@@ -164,7 +140,7 @@ int main(void)
 	mlog("[MAIN LOOP] Terminando...\n");
 
 	mlog("[MESH] Destruyendo...\n");
-	destroy_mesh(m_surface);
+	destroy_mesh(projection.mesh);
 	mlog("[SHADER] Destruyendo...\n");
 	destroy_shader(shader_plain);
 	mlog("[SHADER] Destruyendo...\n");
@@ -174,9 +150,6 @@ int main(void)
 	return 0;
 
 error_context:
-	mlog("[MESH] Destruyendo...\n");
-	destroy_mesh(m_surface);
-error_mesh_surface:
 	mlog("[SHADER] Destruyendo...\n");
 	destroy_shader(shader_plain);
 error_shader_plain:

src/main.h

@@ -36,6 +36,7 @@ struct projection
 		vertex: the number of vertex
 		dim: the dimentions of the surface
 */
+
 struct surface
 {
 	float *data, *norm;
@@ -50,6 +51,8 @@ struct surface
 		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);
@@ -176,9 +179,3 @@ void destroy_texture(id_t texture);
 id_t create_palette_texture(const unsigned char colors[][4], unsigned char n);
 
 quat_t poll_input(window_t window);
-
-#ifdef EMSCRIPTEN
-#ifdef GLAD
-#error undefine GLAD on src/main.h please
-#endif
-#endif

src/surface.c

@@ -1,400 +0,0 @@
-#include <complex.h>
-#include <math.h>
-#include <stdlib.h>
-#include <string.h>
-
-#define TEST
-
-#define CGLM_ALL_UNALIGNED
-#include <cglm/vec3.h>
-#include <cglm/vec4.h>
-
-#ifndef M_PI
-#define M_PI 3.14159265358979323846
-#endif
-
-#ifndef CMPLX
-#define CMPLX(a, b) (a + I * b)
-#endif
-
-#ifdef TEST
-#include <assert.h>
-#endif
-#include <stdio.h>
-
-typedef void (*function_t)(float *, int *, unsigned char *);
-
-struct parm
-{
-	unsigned char *grid;
-	unsigned char m, n;
-	function_t f;
-} parm;
-
-// Función para escribir el archivo .klein
-void write_klein_file(const char *filename, unsigned char dim, unsigned long vertex, float *vertices, float *normals)
-{
-    FILE *file = fopen(filename, "wb");
-    if (!file)
-    {
-        perror("Error al abrir el archivo");
-        exit(EXIT_FAILURE);
-    }
-
-    // Escribir encabezado
-    fwrite("KLEIN", 1, 5, file); // Los primeros 5 bytes son "KLEIN"
-    fputc(0, file);             // Byte vacío
-    fwrite(&dim, 1, 1, file);   // Dimensión de la superficie
-    fwrite(&vertex, sizeof(unsigned long), 1, file); // Número de vértices (8 bytes)
-
-    // Escribir dimensiones de la cuadrícula
-    fwrite(parm.grid, sizeof(unsigned char), dim, file);
-    // Debug info
-    for (int i = 0; i < dim; i++) { 
-    printf("Grid[%d]: %u\n", i, parm.grid[i]);
-    }
-
-    // Escribir vértices (en float)
-    fwrite(vertices, sizeof(float), vertex * dim, file);
-    // Debug info 
-    for (unsigned long i = 0; i < vertex * dim; i++) { 
-    printf("Vertices[%lu]: %f\n", i, vertices[i]); 
-    }
-
-    // Escribir normales (en float)
-    fwrite(normals, sizeof(float), vertex * dim, file);
-    // Debug info 
-    for (unsigned long i = 0; i < vertex * dim; i++) {
-    printf("Normals[%lu]: %f\n", i, normals[i]); 
-    }
-
-    fclose(file);
-    printf("Archivo %s escrito correctamente.\n", filename);
-}
-
-int factorial(int n)
-{
-	if (n == 1)
-		return 1;
-
-	return n * factorial(n - 1);
-}
-
-int faces(int n)
-{
-	if (n == 2)
-		return 1;
-
-	return (1 << (n - 3)) * factorial(n) / factorial(n - 2);
-}
-
-void riemman(float *d_surface, int *coords, unsigned char *grid)
-{
-	complex double eq;
-	float u = 2 * ((float)coords[0] / grid[0]) - 1;
-	float v = 2 * ((float)coords[1] / grid[1]) - 1;
-
-	eq = csqrt(CMPLX(u, v));
-
-	d_surface[0] = u;
-	d_surface[1] = v;
-	d_surface[2] = creal(eq);
-	d_surface[3] = cimag(eq);
-}
-
-void cube(float *d_surface, int *coord, unsigned char *grid)
-{
-	int i;
-
-	for (i = 0; i < parm.m; i++)
-		d_surface[i] = (2 * (float)coord[i] / grid[i]) - 1;
-
-	if (parm.m == 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);
-}
-
-float *generate_data_surface(unsigned char *dim, unsigned long *vertex)
-{
-	unsigned int i, j, k, o, p, n;
-	unsigned long size, q = 0;
-	float *d_surface;
-	int *cara;
-
-	parm.f = cube;
-	parm.m = 4;
-	parm.n = 4;
-	parm.grid = (char[]){16, 8, 4, 2, 1};
-
-#ifdef TEST
-	assert(faces(2) == 1);
-	assert(faces(3) == 6);
-	assert(faces(4) == 24);
-#endif
-
-	*dim = parm.n;
-	*vertex = 0;
-
-	{
-		unsigned char test = 0;
-		for (o = 0; o < parm.m; o++)
-		{
-			for (p = 0; p < o; p++)
-			{
-				test += 1;
-				*vertex += parm.grid[p] * parm.grid[o] * 6 * faces(parm.n);
-			}
-		}
-		*vertex /= test;
-	}
-
-	cara = malloc(parm.m * sizeof(int));
-	size = (*dim) * (*vertex);
-	d_surface = malloc(size * sizeof(float));
-
-	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++;
-
-					cara[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++)
-					{
-						cara[p] = i;
-						cara[o] = j;
-						parm.f(&d_surface[q], cara, parm.grid);
-						q += parm.n;
-
-						cara[p] = i + 1;
-						cara[o] = j;
-						parm.f(&d_surface[q], cara, parm.grid);
-						q += parm.n;
-
-						cara[p] = i + 1;
-						cara[o] = j + 1;
-						parm.f(&d_surface[q], cara, parm.grid);
-						q += parm.n;
-
-						cara[p] = i;
-						cara[o] = j;
-						parm.f(&d_surface[q], cara, parm.grid);
-						q += parm.n;
-
-						cara[p] = i;
-						cara[o] = j + 1;
-						parm.f(&d_surface[q], cara, parm.grid);
-						q += parm.n;
-
-						cara[p] = i + 1;
-						cara[o] = j + 1;
-						parm.f(&d_surface[q], cara, parm.grid);
-						q += parm.n;
-					}
-				}
-			}
-		}
-	}
-
-#ifdef TEST
-	assert(q == size);
-#endif
-	return d_surface;
-}
-
-static 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;
-	}
-}
-
-float *generate_normals_surface(float *d, unsigned char m, unsigned long vertex)
-{
-	float *n;
-	float *norm_vec;
-
-	n = malloc((m * vertex) * sizeof(float));
-
-	norm_vec = malloc(m * sizeof(float));
-
-	for (int i = 0; i < *d; i += 3 * m)
-	{
-
-		__calculate_normal(d + i, d + i + m, d + i + 2 * m, norm_vec, m);
-		glm_vec3_copy(norm_vec, n + i);
-		glm_vec3_copy(norm_vec, n + i + m);
-		glm_vec3_copy(norm_vec, n + i + 2 * m);
-	}
-
-	free(norm_vec);
-	return n;
-}
-int main()
-{
-    unsigned char dim;
-    unsigned long vertex;
-    float *vertices, *normals;
-
-    // Generar datos de la superficie
-    vertices = generate_data_surface(&dim, &vertex);
-
-    // Verificar datos generados 
-    if (vertices == NULL) { 
-    printf("Error: vertices no generados.\n"); 
-    return 1; 
-    }
-
-    printf("Dim: %u, Vertex: %lu\n", dim, vertex);
-
-    // Generar normales
-    normals = generate_normals_surface(vertices, dim, vertex);
-
-   // Verificar normales generadas
-   if (normals == NULL) { 
-   printf("Error: normales no generadas.\n");
-   free(vertices); 
-   return 1; 
-   }
-
-    // Escribir el archivo
-    printf("Escribiendo archivo .klein\n"); 
-    write_klein_file("kingtin.klein", dim, vertex, vertices, normals);
-
-    free(vertices);
-    free(normals);
-
-    return 0;
-}
-

src/window.c

@@ -7,6 +7,7 @@ void __window_callback_input(GLFWwindow *, int, int);
 void __mouse_callback_input(GLFWwindow *, int, int, int);
 void __scroll_callback_input(GLFWwindow *, double, double);
 void __key_callback_input(GLFWwindow *, int, int, int, int);
+void __drop_callback_input(GLFWwindow *, int, const char **);
 
 window_t init_window(unsigned int w, unsigned int h, const char *name);
 
@@ -64,6 +65,7 @@ window_t init_window(unsigned int width, unsigned int height, const char *title)
 	glfwSetMouseButtonCallback((GLFWwindow *)window, __mouse_callback_input);
 	glfwSetScrollCallback((GLFWwindow *)window, __scroll_callback_input);
 	glfwSetKeyCallback((GLFWwindow *)window, __key_callback_input);
+	glfwSetDropCallback((GLFWwindow *)window, __drop_callback_input);
 
 	__window_callback_input((GLFWwindow *)window, width, height);