Merge: roberto -> main

src/context.c

@@ -4,6 +4,9 @@
 void set_clean_color_context( unsigned char r, unsigned char g, unsigned char b )
 {
 	glEnable( GL_DEPTH_TEST );
+	glEnable( GL_CULL_FACE );
+	glCullFace( GL_BACK );
+
 	glClearColor( (float)r/0xff, (float)g/0xff, (float)b/0xff, 1.0 );
 }
 

src/data/shaders.h

@@ -45,6 +45,7 @@ const char * fs_plain =
 	"	FragColor = texture( palette, vec3( 0, 0, index ) ).rgba;"
 	"}";
 
+	
 const char * fs =
 	"#version 330 core\n"
 
@@ -62,11 +63,7 @@ const char * fs =
 	"	vec3 lightPos = vec3(0,0,-15);"
 	"	vec3 lightDir = normalize(lightPos - FragPos);"
 
-/*
+	"	float diffuse = max(dot(Normal, lightDir),0.0); "
-	We use the absoulute value, insted of the traditional "max(...,0.0);"
-	so we can ignore the orientation of the triangles in openGL. 
-*/
-	"	float diffuse = abs(dot(Normal, lightDir)); "
 
 	"	float ambient = 0.5;"
 	"	FragColor = (ambient + diffuse)*color;"

src/main.c

@@ -3,9 +3,12 @@
 #include "data/shaders.h"
 
 #include <stdlib.h>
-#include <cglm/vec3.h>
 #include <stdio.h>
 
+#define CGLM_ALL_UNALIGNED
+#include <cglm/vec3.h>
+#include <cglm/vec4.h>
+
 #define WIDTH 512
 #define HEIGHT 512
 
@@ -19,48 +22,100 @@ unsigned char palette[] =
 	0x7A,0x1C,0xAC,0xff,
 };
 
-void calc_normal(float* v1, float* v2, float* v3, float* normal)
+void calc_normal(float* p1, float* p2, float* p3,float* normal, unsigned char n)
 {
-	vec3 lado1, lado2;
+	float alpha;
+	vec4 v1, v2, v3;
+	vec4 u1, u2, u3; 
+	
+	switch (n)
+	{
+	case 3:
 
-	glm_vec3_sub(v2, v1, lado1); 
+		glm_vec3_sub(p2, p1, v1); 
-	glm_vec3_sub(v3, v1, lado2); 
+		glm_vec3_sub(p3, p1, v2); 
 
-	glm_vec3_cross(lado1, lado2, normal); 
+		glm_vec3_cross(v1, v2, normal); 
-	glm_vec3_normalize(normal);
+		glm_vec3_normalize(normal);
+		return;
+
+	case 4:
+
+		/* 
+			In Grant-Shmidth we need 3 linearly independian vector that forms a basis, 
+			so we can have a ortonormal version of that basis, since, we must have  
+				v1 = p3 - p1
+				v2 = p2 - p1
+			Then v3 = p1, will most certantly be linerly independiant to v1 and v2.
+		*/
+		glm_vec4_sub(p2, p1, v1); 
+		glm_vec4_sub(p3, p1, v2); 
+		glm_vec4_copy(p1, v3); 
+		
+		/* Setup U1 */
+		{
+			glm_vec4_copy(v1, u1);
+		}
+
+		/* Setup U2 */
+		{
+			vec4 proj;
+
+			alpha = glm_vec4_dot(v2, u1) / glm_vec4_dot(u1, u1);
+			glm_vec4_scale(u1, alpha, proj);
+
+			glm_vec4_sub(v2, proj, u2); 
+		}
+
+		/* Setup U3 */
+		{
+			vec4 proj1, proj2;
+
+			alpha = glm_vec4_dot(v3, u1) / glm_vec4_dot(u1, u1);
+			glm_vec4_scale(u1, alpha, proj1);
+		
+			alpha = glm_vec4_dot(v3, u2) / glm_vec4_dot(u2, u2);
+			glm_vec4_scale(u2, alpha, proj2);
+		
+			glm_vec4_sub(v3, proj1, u3);
+			glm_vec4_sub(u3, proj2, u3);
+		}
+		
+		glm_vec4_copy(u3, normal);
+		glm_vec4_normalize(normal);
+		return;
+	}	
 }
 
-float * fill_normal( float * d )
+float * fill_normal( float * d, unsigned char m )
 {
 	float * n;
-
+	n = malloc( (*d+1)*sizeof(float));
-	n = malloc((*d+1)*sizeof(float));
 	*n = *d;
-
+	for (int i = 0; i < *d; i += 3*m)
-	for (int i = 0; i < *d; i += 9)
 	{
 
-		vec3 norm_vec;
+		vec4 norm_vec;
-		calc_normal((d+1)+i, (d+1)+i+3, (d+1)+i+6, norm_vec);
+
+		calc_normal((d+1)+i, (d+1)+i+m, (d+1)+i+2*m, norm_vec, m);
 		glm_vec3_copy( norm_vec, (n+1)+i );
-		glm_vec3_copy( norm_vec, (n+1)+i+3 );
+		glm_vec3_copy( norm_vec, (n+1)+i+m );
-		glm_vec3_copy( norm_vec, (n+1)+i+6 );
+		glm_vec3_copy( norm_vec, (n+1)+i+2*m );
 	}
 	return n;
 }
 
-const char * wname = "manigraph: manifold grapher";
+void mlog( char * msg )
-float * generate_surface(unsigned int, unsigned char *m);
-
-
-void mlog(char * msg)
 {
 #ifdef DEBUG
 	printf(msg);
 #endif
 }
 
-int main(void)
+const char * wname = "manigraph: manifold grapher";
+float * generate_surface();
+
+int main( void )
 {
 	id_t shader, texture, shader_plain;
 	mesh_t m_surface, m_axis;
@@ -122,8 +177,8 @@ int main(void)
 		unsigned char m;
 		float * n_surface, *d_surface;
 		d_surface = generate_surface(16,&m);
-		n_surface = fill_normal(d_surface);
+		n_surface = fill_normal(d_surface, m);
-		if( !(m_surface = create_mesh(d_surface, n_surface, coordanate)))
+		if( !(m_surface = create_mesh(d_surface, n_surface, coordanate, m)))
 		{
 			mlog("[MESH] Error al inicializar...\n");
 			goto error_mesh_surface; 
@@ -135,8 +190,8 @@ int main(void)
 	mlog("[MESH] Inicializando...\n");
 	{
 		float * n_axis;
-		n_axis = fill_normal(d_axis);
+		n_axis = fill_normal(d_axis, 3);
-		if(!(m_axis = create_mesh(d_axis, n_axis, coordanate)))
+		if(!(m_axis = create_mesh(d_axis, n_axis, coordanate, 3)))
 		{
 			mlog("[MESH] Error al inicializar...\n");
 			goto error_mesh_axis; 
@@ -154,6 +209,7 @@ int main(void)
 		load_rot_matrix(shader_plain, q);
 		
 		clean_context();
+
 #ifndef DEBUG
 		load_mdl_matrix(shader_plain, 0, 0);
 		draw_mesh( m_axis);

src/main.h

@@ -4,7 +4,7 @@
 	error of the shaders.
 */
 
-/* #define DEBUG */
+/* #define DEBUG  */
 
 typedef const void * window_t;
 typedef unsigned int id_t;
@@ -32,9 +32,10 @@ void close_window(window_t window);
 		d: array of floats with the vertex data.
 		n: array of floats with the normal data.
 		coordanate: the number of the 3 axis that we are displaying.
+		m: Dimention of mesh
 */
 
-mesh_t create_mesh( float * d, float * n, unsigned char * coordanate );
+mesh_t create_mesh( float * d, float * n, unsigned char * coordanate, unsigned char m );
 
 void destroy_mesh(mesh_t p);
 

src/mesh.c

@@ -13,38 +13,38 @@ struct obj
 	to display using the layout location in GLSL.
 	This trick can be done with glVertexAttribPointer.
 */
-mesh_t create_mesh( float * d, float * n, unsigned char * coordanate )
+mesh_t create_mesh( float * d, float * n, unsigned char * coordanate, unsigned char m )
 {
 	unsigned char i;
 	struct obj * p;
 
 	p=malloc(sizeof(struct obj));
 
-	p->vertex=(*d)/3;
+	p->vertex=(*d)/m;
 
 	glGenVertexArrays( 1, &p->vao );
 
 	glGenBuffers( 1, &p->d_vbo );
 	glBindVertexArray( p->vao );
 	glBindBuffer( GL_ARRAY_BUFFER, p->d_vbo );
-	glBufferData( GL_ARRAY_BUFFER, p->vertex*3*sizeof(float), d+1, 
+	glBufferData( GL_ARRAY_BUFFER, p->vertex*m*sizeof(float), d+1, 
 		GL_STATIC_DRAW );
 
 	for( i=0; i<4; ++i )
 	{
-		glVertexAttribPointer( i,1,GL_FLOAT, 0, 3*sizeof(float), 
+		glVertexAttribPointer( i,1,GL_FLOAT, 0, m*sizeof(float), 
 			(float*)(coordanate[i]*sizeof(float)) );
 		glEnableVertexAttribArray(i);
 	}
 
 	glGenBuffers( 1, &p->n_vbo );
 	glBindBuffer( GL_ARRAY_BUFFER, p->n_vbo );
-	glBufferData( GL_ARRAY_BUFFER, p->vertex*3*sizeof(float), n+1, 
+	glBufferData( GL_ARRAY_BUFFER, p->vertex*m*sizeof(float), n+1, 
 		GL_STATIC_DRAW );
 
 	for( i=0; i<4; ++i )
 	{
-		glVertexAttribPointer( i+4,1,GL_FLOAT, 0, 3*sizeof(float), 
+		glVertexAttribPointer( i+4,1,GL_FLOAT, 0, m*sizeof(float), 
 			(float*)(coordanate[i]*sizeof(float)) );
 		glEnableVertexAttribArray(i+4);
 	}

src/surface.c

@@ -37,28 +37,28 @@ void klein(float *d_surface, int i, int j, int grid_size)
 	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[2] = sin(v)*sin(u/2);
+	d_surface[3] = sin(v)*sin(u/2);
 }
 
-float * generate_surface(int grid_size, unsigned char * m)
+float * generate_surface(int grid_size, unsigned char *m )
 {
-	float * d_surface;
+	unsigned int i,j,k=0;
-	function_t f;
-	int i,j,k=0;
 	long size;
+	function_t f;
+	float * d_surface;
 
-	*m = 3;
 	f = klein;
-	size = grid_size*grid_size*2*3*(*m);
+	*m = 4;
-
+	size = grid_size*grid_size*12*(*m);
 	d_surface = malloc((size+1)*sizeof(float));
 	d_surface[0] = size;
 
+
 	for( i = 0; i < grid_size; i++)
 	{ 
 		for( j = 0; j < grid_size; j++)
 		{
-			// triangle 1
+			// triangle 1, Front
 			f(&d_surface[k + 1], i, j, grid_size);
 			k+=*m;
 			f(&d_surface[k + 1], i + 1, j, grid_size);
@@ -66,13 +66,29 @@ float * generate_surface(int grid_size, unsigned char * m)
 			f(&d_surface[k + 1], i + 1, j + 1, grid_size);
 			k+=*m;
 
-			// triangle 2
+			// triangle 1, Back
+			f(&d_surface[k + 1], i + 1, j + 1, grid_size);
+			k+=*m;
+			f(&d_surface[k + 1], i + 1, j, grid_size);
+			k+=*m;
+			f(&d_surface[k + 1], i, j, grid_size);
+			k+=*m;
+
+			// triangle 2, Frontt
 			f(&d_surface[k + 1], i + 1, j + 1, grid_size);
 			k+=*m;
 			f(&d_surface[k + 1], i, j + 1, grid_size);
 			k+=*m;
 			f(&d_surface[k + 1], i, j, grid_size);
 			k+=*m;
+
+			// triangle 2, Back
+			f(&d_surface[k + 1], i, j, grid_size);
+			k+=*m;
+			f(&d_surface[k + 1], i, j + 1, grid_size);
+			k+=*m;
+			f(&d_surface[k + 1], i + 1, j + 1, grid_size);
+			k+=*m;
 		}
 	}