blockofighter/src/mesh.cpp

#include "main.h"

#include "mesh.h"
#include "vector.h"
#include "sphere.h"
#include "collision.h"
#include "audio.h"

#include <math.h>

#include "glapi.h"

Vertex::Vertex(void){
    vectorSet(position, 0, 0, 0);
    vectorSet(normal, 0, 0, 0);
}

Vertex::Vertex(float x, float y, float z){
    vectorSet(position, x, y, z);
    vectorSet(normal, x, y, z);
    vectorNormalize(normal);
}

Vertex::Vertex(float x, float y, float z, float nx, float ny, float nz){
    vectorSet(position, x, y, z);
    vectorSet(normal, nx, ny, nz);
}

void Vertex::setTexCoords(float u, float v){
  this->texcoords[0] = u;
  this->texcoords[1] = v;
}

Polygon::Polygon(void){
    vertexcount = 0;
    edgecount = 0;
    smooth = false;
    realsmooth = false;
}



Mesh::Mesh(void){
    vertexcount = 0;
    polygoncount = 0;
    edgecount = 0;
}

Mesh::~Mesh(void){
    delete [] polygons;
    delete [] vertices;
}

void Mesh::createPlanes(void){
    int i;
    for (i = 0; i < polygoncount; i++){
        class Polygon *polygon = &this->polygons[i];
        if (polygon->vertexcount >= 3){
            float v1[3], v2[3];
            vectorSub(v1, polygon->vertices[1]->position,
                                        polygon->vertices[0]->position);
            vectorSub(v2, polygon->vertices[2]->position,
                                        polygon->vertices[0]->position);
            vectorCross(polygon->planenormal, v1, v2);
            vectorNormalize(polygon->planenormal);

            polygon->planedistance = -vectorDot(polygon->vertices[0]->position, polygon->planenormal);
        }
    }
}

void Mesh::createVertexnormals(void){
    int i, j, ii;
    bool connect;
    float normal[3];
    for (i = 0; i < vertexcount; i++){
        bool found = false;
        vectorSet(normal, 0, 0, 0);
        for (j = 0; j < polygoncount; j++){
            connect = false;
            class Polygon *polygon = &polygons[j];
            for (ii = 0;ii < polygon->vertexcount; ii++){
                if (polygons[j].vertices[ii] == &(vertices[i])){
                    connect = true;
                }
            }
            if (connect){
                vectorAdd(normal, polygon->planenormal);
                found = true;
            }
        }
        if (found){
            vectorNormalize(vertices[i].normal, normal);
        }
    }
    for (j = 0; j < polygoncount; j++){
        class Polygon *polygon = &polygons[j];
        if (!polygon->realsmooth) polygon->smooth = true;
    }
}

void Mesh::createEdges(void){
    int maxedgecount = 0;
    int i;
    for (i = 0; i < polygoncount; i++){
        class Polygon *polygon = &polygons[i];
        maxedgecount += polygon->vertexcount;
    }

    edgecount = 0;
    int j, k;
    Edge *edges = new Edge[maxedgecount];
    for (i = 0; i < polygoncount; i++){
        class Polygon *polygon = &polygons[i];
        polygon->edges = new Edge *[polygon->vertexcount];
        for (j = 1; j <= polygon->vertexcount; j++){
            Vertex *v1 = polygon->vertices[j-1];
            Vertex *v2 = polygon->vertices[j%polygon->vertexcount];

            bool found = false;
            for (k = 0; k < edgecount; k++){
                if (edges[k].v2 == v1 && edges[k].v1 == v2){
                    found = true;
                    edges[k].p2 = polygon;
                    break;
                }
            }

            if (!found){
                edges[edgecount].v1 = v1;
                edges[edgecount].v2 = v2;
                edges[edgecount].p1 = polygon;
                edges[edgecount].p2 = NULL;
                edgecount++;
            }
        }
    }

    this->edges = new Edge[edgecount];
    //printf("%i\n", edgecount);
    for (i = 0; i < edgecount; i++){
        this->edges[i].v1 = edges[i].v1;
        this->edges[i].v2 = edges[i].v2;
        this->edges[i].p1 = edges[i].p1;
        this->edges[i].p2 = edges[i].p2;

        class Polygon *p;
        p = edges[i].p1;
        p->edges[p->edgecount++] = &this->edges[i];
        p = edges[i].p2;
        p->edges[p->edgecount++] = &this->edges[i];
        //printf("%p, %p\n", edges[i].p1, edges[i].p2);
    }

    delete[] edges;
}


float Mesh::calculateScale(float targetLength, int axis){

    float min = 0.0;
    float max = 0.0;

    for (int i=0; i < this->vertexcount; i++){
        if (this->vertices->position[axis] > max){
            max = this->vertices->position[axis];
        }
        if (this->vertices->position[axis] < min){
            min = this->vertices->position[axis];
        }
    }
    return fabs(targetLength / (max - min));
}

/* ei toimi kunnolla kaikille objekteille (kädet ok, jalat ja torso ei) */
void Mesh::scale(float targetLength, int axis){
    float newscale = this->calculateScale(targetLength, axis);
    this->scale(newscale);
}

/* ei toimi kunnolla kaikille objekteille (kädet ok, jalat ja torso ei)*/
void Mesh::scale(float scale){
    for (int i=0; i < this->vertexcount; i++){
        this->vertices->position[0] *= scale;
        this->vertices->position[1] *= scale;
        this->vertices->position[2] *= scale;
    }
    this->createVertexnormals();
    this->createPlanes();
}

MeshObject::MeshObject(Mesh *mesh){
    this->mesh = mesh;
    this->appearance = new MeshAppearance(mesh);
    this->geometry = new MeshShape(this);
}



MeshAppearance::MeshAppearance(Mesh *mesh){
    this->mesh = mesh;
}



void MeshAppearance::draw(void){
  //glDisable(GL_CULL_FACE);
  glColor4fv(this->material.getColor());
  this->material.enable();

    int i, j;

    for (i = 0; i < mesh->polygoncount; i++){
        class Polygon *polygon = &mesh->polygons[i];

        glBegin(GL_TRIANGLE_FAN);

        if (!polygon->smooth) glNormal3fv(polygon->planenormal);

        for (j = 0; j < polygon->vertexcount; j++){
            Vertex *vertex = polygon->vertices[j];

            if (polygon->smooth) glNormal3fv(vertex->normal);
            glVertex3fv(vertex->position);

        }


        glEnd();
    }


    glDisable(GL_DEPTH);
    glDisable(GL_LIGHTING);
  glLineWidth(5.0);
    glBegin(GL_LINES);
    for (i = 0; i < mesh->edgecount; i++){
        glColor3f(0, 0, 0);
        glVertex3fv(mesh->edges[i].v1->position);
        glVertex3fv(mesh->edges[i].v2->position);
    }

    glEnd();
    glEnable(GL_LIGHTING);
    glEnable(GL_DEPTH);


  this->material.disable();
  //glEnable(GL_CULL_FACE);
}






MeshShape::MeshShape(MeshObject *object) : Shape(object){
    mesh = object->mesh;
}

MeshShape::MeshShape(Object *object, Mesh *mesh) : Shape(object){
    this->mesh = mesh;
}

bool MeshShape::checkCollision(Object *target){
    return target->geometry->checkCollisionPeer(this);
}

float MeshShape::calculateMomentOfInertia(float *rotationvector){
    if (vectorDot(rotationvector, rotationvector) < EPSILON) return 0;
    int i;
    float j = 0;
    for (i = 0; i < mesh->vertexcount; i++){
        float proj[3];
        vectorProject(proj, mesh->vertices[i].position, rotationvector);
        vectorSub(proj, mesh->vertices[i].position, proj);
        //float r = vectorLength(proj);
        float r2 = vectorDot(proj, proj);
        j += r2;
    }
    return j / i;
}

bool MeshShape::checkCollisionPeer(SphereShape *target){
    float position[3] = {0, 0, 0};
    target->object->transformPoint(position, position);
    object->unTransformPoint(position, position);

    float normal[3];
    float contactpoint[3];
    float r = target->getRadius();

    if (checkSphereMeshCollision(position, r, mesh, normal, contactpoint)){
        vectorScale(normal, -1);
        object->transformVector(normal, normal);
        object->transformPoint(contactpoint, contactpoint);

        addCollision(object, target->object, normal, contactpoint);

        //vectorAdd(contactnormal, normal);

        return true;
    }

    return false;
}

//extern Sound *shotsound;

bool MeshShape::checkCollisionPeer(MeshShape *target){
    float normal[3];
    float contactpoint[3];

    bool collided = false;

    int i;

    Mesh *sourcemesh, *targetmesh;

    sourcemesh = this->mesh;
    targetmesh = target->mesh;
    for (i = 0; i < sourcemesh->vertexcount; i++){
        Vertex *vertex = &sourcemesh->vertices[i];
        float vertexposition[3];
        object->transformPoint(vertexposition, vertex->position);
        target->object->unTransformPoint(vertexposition, vertexposition);

        if (checkPointMeshCollision(vertexposition, targetmesh, normal, contactpoint)){
            target->object->transformVector(normal, normal);
            target->object->transformPoint(contactpoint, contactpoint);

            if (vectorIsZero(contactpoint)){
                vectorSet(contactpoint, 0, 0, 0);
            }
            addCollision(object, target->object, normal, contactpoint);
            collided = true;
        }
    }

    sourcemesh = target->mesh;
    targetmesh = this->mesh;
    for (i = 0; i < sourcemesh->vertexcount; i++){
        Vertex *vertex = &sourcemesh->vertices[i];
        float vertexposition[3];
        target->object->transformPoint(vertexposition, vertex->position);
        object->unTransformPoint(vertexposition, vertexposition);

        if (checkPointMeshCollision(vertexposition, targetmesh, normal, contactpoint)){
            object->transformVector(normal, normal);
            object->transformPoint(contactpoint, contactpoint);

            addCollision(target->object, object, normal, contactpoint);
            collided = true;
        }
    }

    sourcemesh = this->mesh;
    targetmesh = target->mesh;
    for (i = 0; i < sourcemesh->edgecount; i++){
        Edge *edge = &sourcemesh->edges[i];
        float v1[3], v2[3];
        object->transformPoint(v1, edge->v1->position);
        target->object->unTransformPoint(v1, v1);

        object->transformPoint(v2, edge->v2->position);
        target->object->unTransformPoint(v2, v2);

        if (checkEdgeMeshCollision(v1, v2, targetmesh, normal, contactpoint)){
            target->object->transformVector(normal, normal);
            target->object->transformPoint(contactpoint, contactpoint);

            addCollision(object, target->object, normal, contactpoint);
            collided = true;
        }
    }

    return collided;
}