100 lines
2.5 KiB
C++
100 lines
2.5 KiB
C++
#include "terrain.hh"
|
|
|
|
Terrain::Terrain(){
|
|
}
|
|
|
|
Terrain::~Terrain() {
|
|
}
|
|
|
|
|
|
void Terrain::load() {
|
|
std::ifstream terrain_png(this->filePath);
|
|
unsigned int rowNum, columnNum;
|
|
|
|
terrain_png.seekg(16); //skip part of the header
|
|
terrain_png.read((char *)&this->heightmapWidth, 4); //read width
|
|
terrain_png.read((char *)&this->heightmapHeight, 4); //read height
|
|
this->heightmapWidth = ntohl(this->heightmapWidth); //convert from host to network byte order
|
|
this->heightmapHeight = ntohl(this->heightmapHeight);
|
|
|
|
heightmap = new unsigned int*[this->heightmapHeight]; //initialize the heightmap
|
|
for(rowNum = 0; rowNum < this->heightmapHeight; rowNum++){ //read in the heightmap
|
|
heightmap[rowNum] = new unsigned int[this->heightmapWidth];
|
|
for(columnNum = 0; columnNum < this->heightmapWidth; columnNum++){
|
|
terrain_png.read((char *)&heightmap[rowNum][columnNum], 1);
|
|
}
|
|
}
|
|
|
|
this->makeTriangleMesh();
|
|
heightmapChanged = false;
|
|
|
|
texture.load();
|
|
}
|
|
|
|
void Terrain::makeTriangleMesh(){
|
|
|
|
ACGL::OpenGL::ArrayBuffer arrayBuffer = ACGL::OpenGL::ArrayBuffer();
|
|
arrayBuffer.defineAttribute("pos", GL_UNSIGNED_INT, 3);
|
|
|
|
unsigned int rowNum=0, columnNum=0; //initializing:
|
|
bool movingRight = true, isUp = true;
|
|
while(rowNum < this->heightmapHeight){ //traversing the Triangle Strip!
|
|
unsigned int newPos[3];
|
|
newPos[0] = rowNum;
|
|
newPos[1] = columnNum;
|
|
newPos[2] = heightmap[rowNum][columnNum];
|
|
arrayBuffer.setDataElements(1, &newPos);
|
|
if (isUp){
|
|
rowNum = rowNum + 1;
|
|
isUp = false;
|
|
}else if (movingRight){
|
|
if (columnNum = this->heightmapWidth - 1){
|
|
arrayBuffer.setDataElements(1, &newPos);
|
|
arrayBuffer.setDataElements(1, &newPos);
|
|
movingRight = false;
|
|
rowNum = rowNum + 1;
|
|
} else{
|
|
rowNum = rowNum - 1;
|
|
columnNum = columnNum + 1;
|
|
isUp = true;
|
|
}
|
|
}else{
|
|
if (columnNum = 0){
|
|
arrayBuffer.setDataElements(1, &newPos);
|
|
arrayBuffer.setDataElements(1, &newPos);
|
|
movingRight = true;
|
|
rowNum = rowNum + 1;
|
|
}else{
|
|
rowNum = rowNum - 1;
|
|
columnNum = columnNum - 1;
|
|
isUp = true;
|
|
}
|
|
}
|
|
}
|
|
|
|
//this->triangleMesh = ACGL::OpenGL::VertexArrayObject(); //does not work since ACGL::OpenGL::VertexArrayObject is ACGL_NOT_COPYABLE
|
|
this->triangleMesh.bind();
|
|
this->triangleMesh.setMode(GL_TRIANGLE_STRIP);
|
|
//this->triangleMesh.attachAllAttributes(arrayBuffer);
|
|
//TODO unbind?
|
|
}
|
|
|
|
void Terrain::render() {
|
|
if (heightmapChanged)
|
|
this->makeTriangleMesh();
|
|
this->triangleMesh.render();
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|