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object.cpp
314 lines (269 loc) · 10.6 KB
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object.cpp
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/*
* ---------------- www.spacesimulator.net --------------
* ---- Space simulators and 3d engine tutorials ----
*
* Author: Damiano Vitulli
*
* This program is released under the BSD licence
* By using this program you agree to licence terms on spacesimulator.net copyright page
*
*
* Object functions
*
*/
#include <math.h>
#include "load_3ds.h"
#include "load_bmp.h"
#include "object.h"
/**********************************************************
*
* VARIABLES DECLARATION
*
*********************************************************/
obj_type object[MAX_OBJECTS]; //Now the object is generic, the cube has annoyed us a little bit, or not?
int obj_qty=0; //Number of objects in our world
int obj_control=0; //Number of the object that we can control
/**********************************************************
*
* FUNCTION ObjLoad(char *p_object_name, char *p_texture_name, float p_pos_x, float p_pos_y, float p_pos_z, float p_rot_x, float p_rot_y, float p_rot_z)
*
* This function loads an object and set some object's data
*
* Parameters: p_object_name = object name
* p_texture_name = texture name
* p_pos_x = starting position x coordinate
* p_pos_y = starting position y coordinate
* p_pos_z = starting position z coordinate
* p_rot_x = starting orientation x axis
* p_rot_y = starting orientation y axis
* p_rot_z = starting orientation z axis
*
* Return value: (char) 1 if the object was loaded correctly, 0 otherwise
*
*********************************************************/
char ObjLoad(char *p_object_name, char *p_texture_name, float p_pos_x, float p_pos_y, float p_pos_z, int p_rot_x, int p_rot_y, int p_rot_z,float scale_x, float scale_y, float scale_z)
{
if (Load3DS (&object[obj_qty],p_object_name)==0) return(0); //Object loading
object[obj_qty].id_texture=LoadBMP(p_texture_name); // The Function LoadBitmap() returns the current texture ID
ObjCalcNormals(&object[obj_qty]); //Once we have all the object data we need to calculate all the normals of the object's vertices
MatrIdentity_4x4(object[obj_qty].matrix); //Object matrix init
ObjPosition(&object[obj_qty], p_pos_x, p_pos_y, p_pos_z); // Object initial position
ObjRotate(&object[obj_qty], p_rot_x, p_rot_y, p_rot_z); // Object initial rotation
ObjScale(&object[obj_qty],scale_x, scale_y, scale_z); //make object bigger or smaller :)
obj_qty++; // Let's increase the object number and get ready to load another object!
return (1); // If all is ok then return 1
}
/***************************************************
*
SUBROUTINE ObjScale(obj_type_ptr p_object)
*
This function scales the specified object
*
Input parameters: p_object = object
*******************************************************/
void ObjScale(obj_type_ptr p_object,float s_x,float s_y,float s_z)
{
int j,k;
matrix_4x4_type l_matrix, l_res;
MatrIdentity_4x4(l_matrix);
l_matrix[0][0]=s_x;
l_matrix[1][1]=s_y;
l_matrix[2][2]=s_z;
//The object matrix is multiplied by a scalar matrix
MatrMul_4x4_4x4(l_matrix,p_object->matrix,l_res);
for(j=0;j<4;j++)
for(k=0;k<4;k++)
p_object->matrix[j][k]=l_res[j][k];
}
/**********************************************************
*
* SUBROUTINE ObjCalcNormals(obj_type_ptr p_object)
*
* This function calculate all the polygons and vertices' normals of the specified object
*
* Input parameters: p_object = object
*
*********************************************************/
void ObjCalcNormals(obj_type_ptr p_object)
{
int i;
p3d_type l_vect1,l_vect2,l_vect3,l_vect_b1,l_vect_b2,l_normal; //Some local vectors
int l_connections_qty[MAX_VERTICES]; //Number of polygons around each vertex
// Resetting vertices' normals...
for (i=0; i<p_object->vertices_qty; i++)
{
p_object->normal[i].x = 0.0;
p_object->normal[i].y = 0.0;
p_object->normal[i].z = 0.0;
l_connections_qty[i]=0;
}
for (i=0; i<p_object->polygons_qty; i++)
{
l_vect1.x = p_object->vertex[p_object->polygon[i].a].x;
l_vect1.y = p_object->vertex[p_object->polygon[i].a].y;
l_vect1.z = p_object->vertex[p_object->polygon[i].a].z;
l_vect2.x = p_object->vertex[p_object->polygon[i].b].x;
l_vect2.y = p_object->vertex[p_object->polygon[i].b].y;
l_vect2.z = p_object->vertex[p_object->polygon[i].b].z;
l_vect3.x = p_object->vertex[p_object->polygon[i].c].x;
l_vect3.y = p_object->vertex[p_object->polygon[i].c].y;
l_vect3.z = p_object->vertex[p_object->polygon[i].c].z;
// Polygon normal calculation
VectCreate (&l_vect1, &l_vect2, &l_vect_b1); // Vector from the first vertex to the second one
VectCreate (&l_vect1, &l_vect3, &l_vect_b2); // Vector from the first vertex to the third one
VectDotProduct (&l_vect_b1, &l_vect_b2, &l_normal); // Dot product between the two vectors
VectNormalize (&l_normal); //Normalizing the resultant we obtain the polygon normal
l_connections_qty[p_object->polygon[i].a]+=1; // For each vertex shared by this polygon we increase the number of connections
l_connections_qty[p_object->polygon[i].b]+=1;
l_connections_qty[p_object->polygon[i].c]+=1;
p_object->normal[p_object->polygon[i].a].x+=l_normal.x; // For each vertex shared by this polygon we add the polygon normal
p_object->normal[p_object->polygon[i].a].y+=l_normal.y;
p_object->normal[p_object->polygon[i].a].z+=l_normal.z;
p_object->normal[p_object->polygon[i].b].x+=l_normal.x;
p_object->normal[p_object->polygon[i].b].y+=l_normal.y;
p_object->normal[p_object->polygon[i].b].z+=l_normal.z;
p_object->normal[p_object->polygon[i].c].x+=l_normal.x;
p_object->normal[p_object->polygon[i].c].y+=l_normal.y;
p_object->normal[p_object->polygon[i].c].z+=l_normal.z;
}
for (i=0; i<p_object->vertices_qty; i++)
{
if (l_connections_qty[i]>0)
{
p_object->normal[i].x /= l_connections_qty[i]; // Let's now average the polygons' normals to obtain the vertex normal!
p_object->normal[i].y /= l_connections_qty[i];
p_object->normal[i].z /= l_connections_qty[i];
}
}
}
/**********************************************************
*
* SUBROUTINE ObjPosition (obj_type_ptr p_object,float p_x,float p_y,float p_z)
*
* Object positioning relative to the world
*
* Input parameters: p_object = object to move
* p_x = x coordinate
* p_y = y coordinate
* p_z = z coordinate
*
*********************************************************/
void ObjPosition (obj_type_ptr p_object,float p_x,float p_y,float p_z)
{
//The position fields in the object matrix are filled with the new values
p_object->matrix[3][0]=p_x;
p_object->matrix[3][1]=p_y;
p_object->matrix[3][2]=p_z;
}
/**********************************************************
*
* SUBROUTINE ObjTranslate (obj_type_ptr p_object,float p_x,float p_y,float p_z)
*
* Object translation relative to the point of view
*
* Input parameters: p_object = object to translate
* p_x = x coordinate
* p_y = y coordinate
* p_z = z coordinate
*
*********************************************************/
void ObjTranslate (obj_type_ptr p_object,float p_x,float p_y,float p_z)
{
int j,k;
matrix_4x4_type l_matrix, l_res;
MatrIdentity_4x4(l_matrix);
l_matrix[3][0]=p_x;
l_matrix[3][1]=p_y;
l_matrix[3][2]=p_z;
//The object matrix is multiplied by a translation matrix
MatrMul_4x4_4x4(l_matrix,p_object->matrix,l_res);
for(j=0;j<4;j++)
for(k=0;k<4;k++)
p_object->matrix[j][k]=l_res[j][k];
}
/**********************************************************
*
* SUBROUTINE ObjTranslateW (obj_type_ptr p_object,float p_x,float p_y,float p_z)
*
* Object translation relative to the world
*
* Input parameters: p_object = object to translate
* p_x = x coordinate
* p_y = y coordinate
* p_z = z coordinate
*
*********************************************************/
void ObjTranslateW (obj_type_ptr p_object,float p_x,float p_y,float p_z)
{
p_object->matrix[3][0]+=p_x;
p_object->matrix[3][1]+=p_y;
p_object->matrix[3][2]+=p_z;
}
/**********************************************************
*
* SUBROUTINE ObjRotate (obj_type_ptr p_object,int p_angle_x,int p_angle_y,int p_angle_z)
*
* Object rotation relative to the point of view
* Angles are expressed in 1/10 degree
*
* Input parameters: p_object = object to rotate
* p_angle_x = x rotation angle
* p_angle_y = y rotation angle
* p_angle_z = z rotation angle
*
*********************************************************/
void ObjRotate (obj_type_ptr p_object,int p_angle_x,int p_angle_y,int p_angle_z)
{
matrix_4x4_type l_matrix, l_res;
//Range control
if (p_angle_x<0) p_angle_x=3600+p_angle_x;
if (p_angle_y<0) p_angle_y=3600+p_angle_y;
if (p_angle_z<0) p_angle_z=3600+p_angle_z;
if (p_angle_x<0 || p_angle_x>3600) p_angle_x=0;
if (p_angle_y<0 || p_angle_y>3600) p_angle_y=0;
if (p_angle_z<0 || p_angle_z>3600) p_angle_z=0;
if (p_angle_x)
{
//The object matrix is multiplied by the X rotation matrix
MatrIdentity_4x4(l_matrix);
l_matrix[1][1]=(matr_cos_table[p_angle_x]);
l_matrix[1][2]=(matr_sin_table[p_angle_x]);
l_matrix[2][1]=(-matr_sin_table[p_angle_x]);
l_matrix[2][2]=(matr_cos_table[p_angle_x]);
MatrMul_4x4_4x4(l_matrix,p_object->matrix,l_res);
MatrCopy_4x4(p_object->matrix,l_res);
}
if (p_angle_y)
{
// ...by the Y rotation matrix
MatrIdentity_4x4(l_matrix);
l_matrix[0][0]=(matr_cos_table[p_angle_y]);
l_matrix[0][2]=(-matr_sin_table[p_angle_y]);
l_matrix[2][0]=(matr_sin_table[p_angle_y]);
l_matrix[2][2]=(matr_cos_table[p_angle_y]);
MatrMul_4x4_4x4(l_matrix,p_object->matrix,l_res);
MatrCopy_4x4(p_object->matrix,l_res);
}
if (p_angle_z)
{
// ...by the Z rotation matrix
MatrIdentity_4x4(l_matrix);
l_matrix[0][0]=(matr_cos_table[p_angle_z]);
l_matrix[0][1]=(matr_sin_table[p_angle_z]);
l_matrix[1][0]=(-matr_sin_table[p_angle_z]);
l_matrix[1][1]=(matr_cos_table[p_angle_z]);
MatrMul_4x4_4x4(l_matrix,p_object->matrix,l_res);
MatrCopy_4x4(p_object->matrix,l_res);
}
}
void ObjSetMaterial(obj_type_ptr p_object, float *ambient, float *diffuse, float *specular, float *shininess)
{
int i;
for(i=0;i<4;i++)
{
p_object->mat_ambient[i] = ambient[i];
p_object->mat_diffuse[i] = diffuse[i];
p_object->mat_specular[i] = specular[i];
}
p_object->mat_shininess[0] = shininess[0];
}