void TerrainRenderer::drawNode(GLdouble offsetX, GLdouble offsetY, GLdouble size, QuadTreeNode *node){
size = size/2;
for(int i=0; i<2; i++){
for(int j=0; j<2; j++){
QuadTreeNode *child;
if(i==0 && j==0) child = node->tlNode;
if(i==1 && j==0) child = node->trNode;
if(i==0 && j==1) child = node->blNode;
if(i==1 && j==1) child = node->brNode;
GLfloat tile_x = size*i+offsetX;
GLfloat tile_y = size*i+offsetY;
GLfloat d = getTileDistance(tile_x, tile_y, transformHeight(child->min), transformHeight(child->max), size);
if(tile_x == 0.0 && tile_y == 0.0 && size == 0.5)
printf("Distance from %i, %i: %f\n", i, j, d);
if(d < size*2 && !child->isLeaf()){
drawNode(size*i+offsetX, size*j+offsetY, size, child);
}else{
drawHeightmap(size*i+offsetX, size*j+offsetY, size, child);
}
}
}
}
void display()
{
displayPrev = displayCurrent;
displayCurrent = clock();
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
if (drawHeightmapFlag){
drawHeightmap();
glutSwapBuffers();
return;
}
if (drawFogFlag){
glEnable(GL_FOG);
glFogf(GL_FOG_MODE, GL_EXP);
glFogf(GL_FOG_DENSITY, 0.008);
GLfloat fogColor[4] = { 0.3f, 0.3f, 0.3f, 1.0f }; // Fog Color
glFogfv(GL_FOG_COLOR, fogColor);
}
else{
glDisable(GL_FOG);
}
//Vale tin kamera
glLoadIdentity();
gluLookAt(cameraPosition[0], cameraPosition[1], cameraPosition[2],
0, 0, 0,
0, 1, 0);
//Draw Skybox
if (drawSkyboxFlag){
drawSkybox();
}
// Draw Terrain
drawTerrain();
//Draw Sea
if (drawSeaFlag){
drawSea();
}
drawSun();
//Add Light
glEnable(GL_NORMALIZE);
glEnable(GL_LINEAR_ATTENUATION);
glShadeModel(GL_SMOOTH);
float zeros[3] = { 0, 0, 0 };
glMaterialfv(GL_FRONT, GL_EMISSION, zeros);
GLfloat lightPos[] = { lightPosition[0], lightPosition[1], lightPosition[2], 1 };
glLightfv(GL_LIGHT0, GL_POSITION, lightPos);
glutSwapBuffers();
}
