127 lines
3.6 KiB
C++
127 lines
3.6 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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this->filePath = "../Levels/LevelTest/terrain"; //TODO remove this, its only for testing
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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[4];
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terrain_png.read(temp, 4); //read width
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this->heightmapWidth = (temp[3]<<0) | (temp[2]<<8) | (temp[1]<<16) | (temp[0]<<24); //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[3]<<0) | (temp[2]<<8) | (temp[1]<<16) | (temp[0]<<24); //convert from network to host byte order
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printf("Width: %d ", (int)this->heightmapWidth);
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printf("Height: %d ", (int)this->heightmapHeight);
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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 / 256;
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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 ab = std::make_shared<ACGL::OpenGL::ArrayBuffer>();
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ab->defineAttribute("pos", GL_FLOAT, 3); //TODO: ArrayBuffer for the texture coordinates
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unsigned int rowNum=0, columnNum=0, dataCount=0; //initializing:
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bool movingRight = true, isUp = true;
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int numVertices = (this->heightmapHeight - 1) * (this->heightmapWidth * 2 + 1) + 1;
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printf("NumberofVertices: %d ", numVertices);
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float* abData = new float[numVertices * 3];
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while(rowNum < this->heightmapHeight){ //traversing the Triangle Strip!
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abData[dataCount] = (float)rowNum;
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abData[dataCount+1] = heightmap[rowNum][columnNum];
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abData[dataCount+2] = (float)columnNum;
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dataCount += 3;
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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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abData[dataCount] = (float)rowNum;
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abData[dataCount+1] = heightmap[rowNum][columnNum];
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abData[dataCount+2] = (float)columnNum;
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dataCount += 3;
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abData[dataCount] = (float)rowNum;
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abData[dataCount+1] = heightmap[rowNum][columnNum];
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abData[dataCount+2] = (float)columnNum;
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dataCount += 3;
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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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abData[dataCount] = (float)rowNum;
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abData[dataCount+1] = heightmap[rowNum][columnNum];
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abData[dataCount+2] = (float)columnNum;
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dataCount += 3;
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abData[dataCount] = (float)rowNum;
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abData[dataCount+1] = heightmap[rowNum][columnNum];
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abData[dataCount+2] = (float)columnNum;
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dataCount += 3;
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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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ab->setDataElements(numVertices, abData);
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this->triangleMesh = std::make_shared<ACGL::OpenGL::VertexArrayObject>();
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this->triangleMesh->bind();
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this->triangleMesh->setMode(GL_TRIANGLE_STRIP);
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this->triangleMesh->attachAllAttributes(ab);
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//TODO unbind?
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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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