#include "mesh.h"
#include <malloc.h>
#include <math.h>
#include <stdio.h>
	
pMesh creerMesh (char *nomFich) 
{
    /*****************************/
    /* A coder par les etudiants */
    /*****************************/
}

void afficheMesh (pMesh mesh) {
  
	/***********************************************************/ 
	/* Les lignes commentees dans cette fonction sont a	   *
	 * decommenter lorsque le calcul des normales est effectue */
	/***********************************************************/ 
    

	glPushMatrix();
	
		glMaterialfv(GL_FRONT_AND_BACK, GL_AMBIENT, mesh->mat_ambient);
		glMaterialfv(GL_FRONT_AND_BACK, GL_DIFFUSE, mesh->mat_diffuse);
		glMaterialfv(GL_FRONT_AND_BACK, GL_SPECULAR, mesh->mat_specular);
		glMaterialf(GL_FRONT_AND_BACK, GL_SHININESS, mesh->mat_shininess);
			
		glBindBuffer(GL_ARRAY_BUFFER, mesh->idBufferSommets);
		glVertexPointer( 3, GL_FLOAT, 0, NULL);
				
		/* glBindBuffer(GL_ARRAY_BUFFER, mesh->idBufferNormales); */
		/* glNormalPointer (GL_FLOAT, 0, NULL); */
			
		glEnableClientState(GL_VERTEX_ARRAY);
		/* glEnableClientState(GL_NORMAL_ARRAY); */
		
		glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, mesh->idBufferIndex);
 		glDrawRangeElementsEXT(GL_TRIANGLES, 0, mesh->nbSommets-1, mesh->nbIndex, GL_UNSIGNED_INT, NULL);

		glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
		glBindBuffer(GL_ARRAY_BUFFER, 0);

 		glDisableClientState(GL_VERTEX_ARRAY);
 		/* glDisableClientState(GL_NORMAL_ARRAY); */

	glPopMatrix();
}

void creerMeshVBO (pMesh mesh) {
  
	/***********************************************************/ 
	/* Les lignes commentees dans cette fonction sont a	   *
	 * decommenter lorsque le calcul des normales est effectue */
	/***********************************************************/ 
	
	glGenBuffers(1, &(mesh->idBufferSommets));
	/* glGenBuffers(1, &(mesh->idBufferNormales)); */
	glGenBuffers(1, &(mesh->idBufferIndex));
    
	glBindBuffer(GL_ARRAY_BUFFER, mesh->idBufferSommets);
	glBufferData(GL_ARRAY_BUFFER, mesh->nbSommets*3*sizeof(float), mesh->sommets, GL_STATIC_DRAW);
    
 	/* glBindBuffer(GL_ARRAY_BUFFER, mesh->idBufferNormales); */
	/* glBufferData(GL_ARRAY_BUFFER, mesh->nbSommets*3*sizeof(float), mesh->normales, GL_STATIC_DRAW); */
	
 	glBindBuffer(GL_ARRAY_BUFFER, 0);

	glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, mesh->idBufferIndex);
	glBufferData(GL_ELEMENT_ARRAY_BUFFER, mesh->nbIndex*sizeof(GLuint), mesh->index, GL_STATIC_DRAW);
	glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);

}