104 lines
2.7 KiB
C++
104 lines
2.7 KiB
C++
#include "terrain.hh"
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Terrain::Terrain(std::string filePath){
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this->filePath = filePath;
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}
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Terrain::Terrain(){
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}
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Terrain::~Terrain() {
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}
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void Terrain::load() {
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std::ifstream terrain_png(this->filePath + "/heightmap.png"); //TODO: filepath organization
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unsigned int rowNum, columnNum, heightmapValue;
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terrain_png.seekg(16); //skip part of the header
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char temp[2];
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terrain_png.read(temp, 4); //read width
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this->heightmapWidth = (temp[1]<<0) | (temp[0]<<8); //convert from network to host byte order
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terrain_png.read(temp, 4); //read height
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this->heightmapHeight = (temp[1]<<0) | (temp[0]<<8); //convert from network to host byte order
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heightmap = new float*[this->heightmapHeight]; //initialize the heightmap
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for(rowNum = 0; rowNum < this->heightmapHeight; rowNum++){ //read in the heightmap
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heightmap[rowNum] = new float[this->heightmapWidth];
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for(columnNum = 0; columnNum < this->heightmapWidth; columnNum++){
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terrain_png.read((char *)&heightmapValue, 1);
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heightmap[rowNum][columnNum] = (float)heightmapValue / 5;
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}
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}
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this->makeTriangleMesh();
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heightmapChanged = false; //no need to make a TriangleMesh again before rendering
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}
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void Terrain::makeTriangleMesh(){
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ACGL::OpenGL::SharedArrayBuffer arrayBuffer = ACGL::OpenGL::SharedArrayBuffer();
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arrayBuffer->defineAttribute("pos", GL_FLOAT, 3); //TODO: ArrayBuffer for the texture coordinates
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unsigned int rowNum=0, columnNum=0; //initializing:
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bool movingRight = true, isUp = true;
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while(rowNum < this->heightmapHeight){ //traversing the Triangle Strip!
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float newPos[3];
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newPos[0] = (float)rowNum;
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newPos[1] = (float)columnNum;
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newPos[2] = heightmap[rowNum][columnNum];
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arrayBuffer->setDataElements(1, &newPos);
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if (isUp){
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rowNum = rowNum + 1;
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isUp = false;
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}else if (movingRight){
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if (columnNum == this->heightmapWidth - 1){
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arrayBuffer->setDataElements(1, &newPos);
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arrayBuffer->setDataElements(1, &newPos);
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movingRight = false;
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rowNum = rowNum + 1;
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} else{
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rowNum = rowNum - 1;
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columnNum = columnNum + 1;
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isUp = true;
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}
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}else{
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if (columnNum == 0){
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arrayBuffer->setDataElements(1, &newPos);
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arrayBuffer->setDataElements(1, &newPos);
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movingRight = true;
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rowNum = rowNum + 1;
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}else{
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rowNum = rowNum - 1;
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columnNum = columnNum - 1;
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isUp = true;
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}
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}
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}
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this->triangleMesh = ACGL::OpenGL::SharedVertexArrayObject();
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this->triangleMesh->bind();
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this->triangleMesh->setMode(GL_TRIANGLE_STRIP);
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this->triangleMesh->attachAllAttributes(arrayBuffer);
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}
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void Terrain::render() {
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if (heightmapChanged)
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this->makeTriangleMesh();
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this->triangleMesh->render();
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}
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