void Tile::draw(const Mercator::Terrain & h, int x, int y)
{
if (tex_id == -1) { return; }
glBindTexture(GL_TEXTURE_2D, tex_id);
glEnable(GL_TEXTURE_2D);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
float dw = m_pw / (2 * tileSize);
float dh = m_ph / (2 * tileSize);
int tile_size = tileSize + 1;
GLfloat vertices[(tile_size * tile_size) * 3],
texcoord[(tile_size * tile_size) * 3];
int tindex = -1;
int vindex = -1;
for(int j = 0; j < tile_size; ++j) {
for(int i = 0; i < tile_size; ++i) {
texcoord[++tindex] = m_pw/2 + dw * (i - j);
texcoord[++tindex] = dh * (i + j);
vertices[++vindex] = i;
vertices[++vindex] = j;
vertices[++vindex] = h.get(x + i, y + j);
}
}
GLuint indices[(int)tileSize * tile_size * 4];
int iindex = -1;
for (int i = 0; i < tile_size - 1; ++i) {
for (int j = 0; j < tile_size; ++j) {
indices[++iindex] = j * tile_size + i;
indices[++iindex] = j * tile_size + i + 1;
}
if (++i >= tileSize) { break; }
for (int j = tileSize; j >= 0; --j) {
indices[++iindex] = j * tile_size + i + 1;
indices[++iindex] = j * tile_size + i;
}
}
glEnableClientState(GL_TEXTURE_COORD_ARRAY);
glVertexPointer(3, GL_FLOAT, 0, vertices);
glTexCoordPointer(2, GL_FLOAT, 0, texcoord);
glDrawElements(GL_TRIANGLE_STRIP, ++iindex, GL_UNSIGNED_INT, indices);
glDisableClientState(GL_TEXTURE_COORD_ARRAY);
glDisable(GL_TEXTURE_2D);
}
int main()
{
int size = 64;
Mercator::Segment *s = new Mercator::Segment(0, 0, size);
Mercator::Matrix<2, 2, Mercator::BasePoint> & base = s->getControlPoints();
base[0] = Mercator::BasePoint(10.f, 3.f);
base[1].height() = 15.f;
base[2] = Mercator::BasePoint(10.f, 10.f);
base[3] = Mercator::BasePoint(9.32f, 1.9f);
s->populate();
/* s->populateNormals();
float *n=s->getNormals();
i*/ //for (int i=0; i<=size; ++i) {
int i=0;
for (int j=0; j<=size; ++j) {
std::cout << j << ":" << s->get(i,j) << ", " ;
}
//}
/* std::cout << s->get(i,j) << " ; ";
std::cout << n[j * size * 3 + i * 3 ] << " : ";
std::cout << n[j * size * 3 + i * 3 + 1] << " : ";
std::cout << n[j * size * 3 + i * 3 + 2];
std::cout << std::endl;
}
std::cout << std::endl;
}
*/
Mercator::Terrain t;
t.setBasePoint(0,0,10.0);
t.setBasePoint(0,1,12.0);
t.setBasePoint(1,0,14.0);
t.setBasePoint(1,1,16.0);
std::cout << t.getSegmentAtIndex(0,0);
t.setBasePoint(1,1,12.0);
std::cout << t.getSegmentAtIndex(0,0);
std::cout << std::endl;
return 0;
}
int main()
{
Mercator::Terrain t;
// Add a null test shader to the terrain
Mercator::Shader * shader = new TestShader;
t.addShader(shader, 0);
// Create a test area with a shape which intersects
// the Segment at 0,0
Mercator::Area* a1 = new Mercator::Area(0, false);
WFMath::Polygon<2> p;
p.addCorner(p.numCorners(), WFMath::Point<2>(3, 4));
p.addCorner(p.numCorners(), WFMath::Point<2>(10, 10));
p.addCorner(p.numCorners(), WFMath::Point<2>(14, 6));
p.addCorner(p.numCorners(), WFMath::Point<2>(18, 4));
p.addCorner(p.numCorners(), WFMath::Point<2>(17, 19));
p.addCorner(p.numCorners(), WFMath::Point<2>(6, 20));
p.addCorner(p.numCorners(), WFMath::Point<2>(-1, 18));
p.addCorner(p.numCorners(), WFMath::Point<2>(-8, 11));
a1->setShape(p);
// Add enough base points to force the creation of the Segment at 0,0
t.setBasePoint(0, 0, -1);
t.setBasePoint(0, 1, 8);
t.setBasePoint(1, 0, 2);
t.setBasePoint(1, 1, 11);
// Get the Segment at 0,0
Mercator::Segment * seg = t.getSegmentAtIndex(0,0);
assert(seg != 0);
// Get the surfaces, and add one corresponding to the shader we added.
// We need to do this as the functions that would normally make it happen
// have been stubbed out.
Mercator::Segment::Surfacestore & sss = seg->getSurfaces();
Mercator::Surface * sfce = new Mercator::Surface(*seg, *shader);
// Force allocation of the surface buffer so we can check later that it
// gets destroyed when the area is added to the terrain.
sfce->allocate();
assert(sfce->isValid());
// Add the surface to the store for this segment
sss[0] = sfce;
// Add the area which should cause relevant surface date to be invalidated
t.addArea(a1);
// We assert this to ensure that the buffer has been de-allocated
// by a call to Surface::invalidate caused by adding the Area.
assert(!sfce->isValid());
// force the surface to re-allocate
sfce->allocate();
assert(sfce->isValid());
// Modify the areas shape
p.addCorner(p.numCorners(), WFMath::Point<2>(-9, 12));
a1->setShape(p);
// and cause an area update
t.updateArea(a1);
// Check the surface has been invalidated again
assert(!sfce->isValid());
// force the surface to re-allocate
sfce->allocate();
assert(sfce->isValid());
t.removeArea(a1);
// Check the surface has been invalidated again
assert(!sfce->isValid());
}
//test intersection using a rudimentary physics simulation
//this drops a particle onto the terrain and it bounces around a bit
int main()
{
Mercator::Terrain terrain;
terrain.setBasePoint(0, 0, 2.8);
terrain.setBasePoint(1, 0, 7.1);
terrain.setBasePoint(0, 1, 0.2);
terrain.setBasePoint(1, 1, 14.7);
Mercator::Segment * segment = terrain.getSegment(0, 0);
if (segment == 0) {
std::cerr << "Segment not created by addition of required basepoints"
<< std::endl << std::flush;
return 1;
}
segment->populate();
WFMath::Point<3> pos(30.0,30.0,100.0); //starting position
WFMath::Vector<3> vel(0.0,1.0,0.0); //starting velocity
WFMath::Vector<3> grav(0.0,0.0,-9.8); //gravity
WFMath::Point<3> intersection;
WFMath::Vector<3> intnormal;
float timestep = 0.1;
float e = 0.2; //elasticity of collision
float totalT = 20.0; //time limit
float par = 0.0;
float t = timestep;
while (totalT > timestep) {
vel += t * grav;
if (Mercator::Intersect(terrain, pos, vel * t, intersection, intnormal, par)) {
//set pos to collision time,
//less a small amout to keep objects apart
pos = intersection - (vel * .01 * t);
WFMath::Vector<3> impulse = intnormal * (Dot(vel, intnormal) * -2);
std::cerr << "HIT" << std::endl;
vel = (vel + impulse) * e; //not sure of the impulse equation, but this will do
if (vel.sqrMag() < 0.01) {
//stop if velocities are small
std::cerr << "friction stop" << std::endl;
break;
}
totalT -= par*t;
t = (1.0-par)*t;
}
else {
pos += vel*t;
totalT -= t;
t = timestep;
}
std::cerr << "timeLeft:" << totalT << " end pos" << pos << " vel" << vel << std::endl;
}
return 0;
}
int main()
{
Mercator::Terrain terrain;
terrain.setBasePoint(0, 0, 2.8);
terrain.setBasePoint(1, 0, 7.1);
terrain.setBasePoint(0, 1, 0.2);
terrain.setBasePoint(1, 1, 14.7);
Mercator::Segment * segment = terrain.getSegment(0, 0);
if (segment == 0) {
std::cerr << "Segment not created by addition of required basepoints"
<< std::endl << std::flush;
return 1;
}
segment->populate();
//test box definitely outside terrain
WFMath::AxisBox<3> highab(WFMath::Point<3> (10.0, 10.0, segment->getMax() + 3.0),
WFMath::Point<3> (20.0, 20.0, segment->getMax() + 6.1));
if (Mercator::Intersect(terrain, highab)) {
std::cerr << "axisbox intersects with terrain even though it should be above it"
<< std::endl;
return 1;
}
//test box definitely inside terrain
WFMath::AxisBox<3> lowab(WFMath::Point<3> (10.0, 10.0, segment->getMin() - 6.1),
WFMath::Point<3> (20.0, 20.0, segment->getMax() - 3.0));
if (!Mercator::Intersect(terrain, lowab)) {
std::cerr << "axisbox does not intersect with terrain even though it should be below it"
<< std::endl;
return 1;
}
//test axis box moved from above terrain to below it.
bool inter=false;
float dz = highab.highCorner()[2] - highab.lowCorner()[2] - 0.1;
while (highab.highCorner()[2] > segment->getMin()) {
highab.shift(WFMath::Vector<3>(0.0, 0.0, -dz));
if (Mercator::Intersect(terrain, highab)) {
inter=true;
break;
}
}
if (!inter) {
std::cerr << "axisbox passed through terrain with no intersection"
<< std::endl;
return 1;
}
//test axisbox that spans two segments
terrain.setBasePoint(0, 2, 4.8);
terrain.setBasePoint(1, 2, 3.7);
Mercator::Segment *segment2 = terrain.getSegment(0, 1);
segment2->populate();
float segmax=std::max(segment->getMax(), segment2->getMax());
float segmin=std::min(segment->getMin(), segment2->getMin());
WFMath::AxisBox<3> ab(WFMath::Point<3> (50.0, 10.0, segmax + 3.0),
WFMath::Point<3> (70.0, 20.0, segmax + 6.1));
if (Mercator::Intersect(terrain, ab)) {
std::cerr << "axisbox2 intersects with terrain even though it should be above it"
<< std::endl;
return 1;
}
WFMath::AxisBox<3> ab2(WFMath::Point<3> (50.0, 10.0, segmin - 6.1),
WFMath::Point<3> (70.0, 20.0, segmin + 3.0));
if (!Mercator::Intersect(terrain, ab2)) {
std::cerr << "axisbox2 does not intersect with terrain even though it should be below it"
<< std::endl;
return 1;
}
WFMath::Point<3> intPoint;
WFMath::Vector<3> intNorm;
float par;
//test vertical ray
if (Mercator::Intersect(terrain, WFMath::Point<3>(20.1, 20.2, segmax + 3),
WFMath::Vector<3>(0.0,0.0,50.0), intPoint, intNorm, par)) {
std::cerr << "vertical ray intersected when it shouldnt" << std::endl;
return 1;
}
if (!Mercator::Intersect(terrain, WFMath::Point<3>(20.1, 20.2, segmax + 3),
WFMath::Vector<3>(0.0,0.0,-50.0), intPoint, intNorm, par)) {
std::cerr << "vertical ray didnt intersect when it should" << std::endl;
return 1;
}
//test each quadrant
if (!Mercator::Intersect(terrain, WFMath::Point<3>(20.1, 20.2, segmax + 3),
WFMath::Vector<3>(10.0,10.0,-100.0), intPoint, intNorm, par)) {
std::cerr << "quad1 ray didnt intersect when it should" << std::endl;
return 1;
}
if (!Mercator::Intersect(terrain, WFMath::Point<3>(20.1, 20.2, segmax + 3),
WFMath::Vector<3>(10.0,-15.0,-50.0), intPoint, intNorm, par)) {
std::cerr << "quad2 ray didnt intersect when it should" << std::endl;
return 1;
}
if (!Mercator::Intersect(terrain, WFMath::Point<3>(20.1, 20.2, segmax + 3),
WFMath::Vector<3>(-10.0,-10.0,-50.0), intPoint, intNorm, par)) {
std::cerr << "quad3 ray didnt intersect when it should" << std::endl;
return 1;
}
if (!Mercator::Intersect(terrain, WFMath::Point<3>(20.1, 20.2, segmax + 3),
WFMath::Vector<3>(-10.0,10.0,-50.0), intPoint, intNorm, par)) {
std::cerr << "quad4 ray didnt intersect when it should" << std::endl;
return 1;
}
//test dx==0 and dy==0
if (!Mercator::Intersect(terrain, WFMath::Point<3>(20.1, 20.2, segmax + 3),
WFMath::Vector<3>(0.0,10.0,-50.0), intPoint, intNorm, par)) {
std::cerr << "y+ ray didnt intersect when it should" << std::endl;
return 1;
}
if (!Mercator::Intersect(terrain, WFMath::Point<3>(20.1, 20.2, segmax + 3),
WFMath::Vector<3>(0.0,-10.0,-50.0), intPoint, intNorm, par)) {
std::cerr << "y- ray didnt intersect when it should" << std::endl;
return 1;
}
if (!Mercator::Intersect(terrain, WFMath::Point<3>(20.1, 20.2, segmax + 3),
WFMath::Vector<3>(-10.0,0.0,-50.0), intPoint, intNorm, par)) {
std::cerr << "x- ray didnt intersect when it should" << std::endl;
return 1;
}
if (!Mercator::Intersect(terrain, WFMath::Point<3>(20.1, 20.2, segmax + 3),
WFMath::Vector<3>(10.0,0.0,-50.0), intPoint, intNorm, par)) {
std::cerr << "x+ ray didnt intersect when it should" << std::endl;
return 1;
}
//test a longer ray
if (!Mercator::Intersect(terrain, WFMath::Point<3>(-10.08, -20.37, segmax + 3),
WFMath::Vector<3>(100.0,183.0,-50.0), intPoint, intNorm, par)) {
std::cerr << "long ray didnt intersect when it should" << std::endl;
return 1;
}
//check the height value
float h;
WFMath::Vector<3> n;
terrain.getHeightAndNormal(intPoint[0], intPoint[1], h, n);
n.normalize();
if (n != intNorm) {
std::cerr << "calculated normal is different from getHeightAndNormal" << std::endl;
std::cerr << intPoint << std::endl;
std::cerr << intNorm << "!=" << n << std::endl;
// return 1;
}
// We can't check for equality here is it just doesn't work with
// floats. Look it up in any programming book if you don't believe me.
// - 20040721 <*****@*****.**>
if (fabs(h - intPoint[2]) > 0.00001) {
std::cerr << "calculated height is different from getHeightAndNormal" << std::endl;
std::cerr << h << "!=" << intPoint[2] << std::endl;
return 1;
}
return 0;
}