@Override
public int compare(Chunk a, Chunk b) {
Vector3 camPos = cam.getPosition();
double distA =
MathUtils.distSq(a.x, a.y, a.z, camPos.getXF(), camPos.getYF(), camPos.getZF());
double distB =
MathUtils.distSq(b.x, b.y, b.z, camPos.getXF(), camPos.getYF(), camPos.getZF());
if (distA < distB) {
return -1;
} else if (distA > distB) {
return 1;
} else {
return 0;
}
}
public void render(final Camera cam) {
boolean sortChunks = false;
Vector3 camPos = cam.getPosition();
boolean camInNewChunk = true;
if (lastPos != null) {
camInNewChunk =
(lastPos.getXI() / 16) != (camPos.getXI() / 16)
|| (lastPos.getYI() / 16) != (camPos.getYI() / 16)
|| (lastPos.getZI() / 16) != (camPos.getZI() / 16);
}
if (camInNewChunk) {
sortChunks = true;
}
lastPos = cam.getPosition();
GL11.glEnable(GL11.GL_ALPHA_TEST);
GL11.glBlendFunc(GL11.GL_SRC_ALPHA, GL11.GL_ONE_MINUS_SRC_ALPHA);
GL11.glAlphaFunc(GL11.GL_NOTEQUAL, 0);
class CompareChunk implements Comparator<Chunk> {
@Override
public int compare(Chunk a, Chunk b) {
Vector3 camPos = cam.getPosition();
double distA =
MathUtils.distSq(a.x, a.y, a.z, camPos.getXF(), camPos.getYF(), camPos.getZF());
double distB =
MathUtils.distSq(b.x, b.y, b.z, camPos.getXF(), camPos.getYF(), camPos.getZF());
if (distA < distB) {
return -1;
} else if (distA > distB) {
return 1;
} else {
return 0;
}
}
}
if (sortChunks) {
Collections.sort(renderList, new CompareChunk());
}
for (Chunk chunk : renderList) {
Vector3 chunkToCam = chunk.getPositionCenter().sub(camPos);
if (chunkToCam.getLengthSq()
< Math.pow(Main.renderDist + Chunk.xSize, 2)) { // if chunk is within renderdistance
Vector3 toCam1 = chunk.getPositionCorner(0, 0, 0).sub(camPos);
Vector3 toCam2 = chunk.getPositionCorner(0, 0, 1).sub(camPos);
Vector3 toCam3 = chunk.getPositionCorner(0, 1, 0).sub(camPos);
Vector3 toCam4 = chunk.getPositionCorner(0, 1, 1).sub(camPos);
Vector3 toCam5 = chunk.getPositionCorner(1, 0, 0).sub(camPos);
Vector3 toCam6 = chunk.getPositionCorner(1, 0, 1).sub(camPos);
Vector3 toCam7 = chunk.getPositionCorner(1, 1, 0).sub(camPos);
Vector3 toCam8 = chunk.getPositionCorner(1, 1, 1).sub(camPos);
toCam1.normalize();
toCam2.normalize();
toCam3.normalize();
toCam4.normalize();
toCam5.normalize();
toCam6.normalize();
toCam7.normalize();
toCam8.normalize();
Vector3 camVec = cam.getLookat().sub(cam.getPosition());
camVec.normalize();
double dot1 = toCam1.dot(camVec);
double dot2 = toCam2.dot(camVec);
double dot3 = toCam3.dot(camVec);
double dot4 = toCam4.dot(camVec);
double dot5 = toCam5.dot(camVec);
double dot6 = toCam6.dot(camVec);
double dot7 = toCam7.dot(camVec);
double dot8 = toCam8.dot(camVec);
if (dot1 > 0 || dot2 > 0 || dot3 > 0 || dot4 > 0 || dot5 > 0 || dot6 > 0 || dot7 > 0
|| dot8 > 0) { // if chunk is not behind camera
GL11.glPushMatrix();
GL11.glTranslatef(chunk.x * Chunk.xSize, chunk.y * Chunk.ySize, chunk.z * Chunk.zSize);
chunk.render();
GL11.glPopMatrix();
}
}
}
}