faerbit/Saxum
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Adding parameters to the makeTrinagleMesh to control the area for which it creates the terrain. Also changing most unsigned ints to ints to make said more roboust in use.

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Faerbit 2015-03-16 15:26:30 +01:00
parent 15412b9b45
commit ab7d1c81df
2 changed files with 33 additions and 18 deletions
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40
game/terrain.cc
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@ -14,22 +14,38 @@ Terrain::~Terrain() {
void Terrain::load() {
std::vector<unsigned char> image; //the raw pixels
unsigned error = lodepng::decode(image, heightmapWidth, heightmapHeight, heightmapFilePath);
unsigned int heightmapHeightLoading = 0;
unsigned int heightmapWidthLoading = 0;
unsigned error = lodepng::decode(image, heightmapWidthLoading, heightmapHeightLoading, heightmapFilePath);
if (error) {
std::cout << "Decoder error " << error << " from Terrain::load: " << lodepng_error_text(error) << std::endl;
}
this->heightmapHeight = heightmapHeightLoading;
this->heightmapWidth = heightmapWidthLoading;
this->heightmap = new float*[this->heightmapWidth]; //initialize the heightmap
for(unsigned int columnNum = 0; columnNum < this->heightmapWidth; columnNum++){ //read in the heightmap
for(int columnNum = 0; columnNum < this->heightmapWidth; columnNum++){ //read in the heightmap
this->heightmap[columnNum] = new float[this->heightmapHeight];
for(unsigned int rowNum = 0; rowNum < this->heightmapHeight; rowNum++){
for(int rowNum = 0; rowNum < this->heightmapHeight; rowNum++){
this->heightmap[columnNum][rowNum] = (float)(image[(rowNum*heightmapWidth+columnNum)*4]) / 6; //<--heightmap is scaled here
}
}
this->makeTriangleMesh();
this->makeTriangleMesh(0, 0, heightmapHeight, heightmapWidth);
heightmapChanged = false; //no need to make a TriangleMesh again before rendering
}
void Terrain::makeTriangleMesh(){
void Terrain::makeTriangleMesh(int startX, int startZ, int endX, int endZ) {
if (startX < 0) {
startX = 0;
}
if (startZ < 0) {
startZ = 0;
}
if (endX > heightmapHeight) {
endX = heightmapHeight;
}
if (endZ > heightmapWidth) {
endZ = heightmapWidth;
}
ACGL::OpenGL::SharedArrayBuffer ab = std::make_shared<ACGL::OpenGL::ArrayBuffer>();
// Do NOT change the order of this!
@ -37,12 +53,12 @@ void Terrain::makeTriangleMesh(){
ab->defineAttribute("aTexCoord", GL_FLOAT, 2);
ab->defineAttribute("aNormal", GL_FLOAT, 3);
unsigned int rowNum=0, columnNum=0, dataCount=0, floatsPerVertex=8; //initializing:
int rowNum = startX, columnNum = startZ, dataCount=0, floatsPerVertex=8; //initializing:
bool movingRight = true, isUp = true;
int numVertices = (this->heightmapHeight - 1) * (this->heightmapWidth * 2 + 1) + 1;
float* abData = new float[numVertices * floatsPerVertex];
while(rowNum < this->heightmapHeight){ //traversing the Triangle Strip!
while(rowNum < endX){ //traversing the Triangle Strip!
set_abData(abData, dataCount, rowNum, columnNum);
dataCount += floatsPerVertex;
if (isUp){
@ -50,7 +66,7 @@ void Terrain::makeTriangleMesh(){
isUp = false;
}
else if (movingRight) {
if (columnNum == this->heightmapWidth - 1) {
if (columnNum == endZ - 1) {
set_abData(abData, dataCount, rowNum, columnNum);
dataCount += floatsPerVertex;
set_abData(abData, dataCount, rowNum, columnNum);
@ -65,7 +81,7 @@ void Terrain::makeTriangleMesh(){
}
}
else {
if (columnNum == 0){
if (columnNum == startZ){
set_abData(abData, dataCount, rowNum, columnNum);
dataCount += floatsPerVertex;
set_abData(abData, dataCount, rowNum, columnNum);
@ -91,7 +107,7 @@ void Terrain::makeTriangleMesh(){
void Terrain::set_abData(float* abData, unsigned int dataCount, unsigned int rowNum, unsigned int columnNum){
void Terrain::set_abData(float* abData, int dataCount, int rowNum, int columnNum){
//set Position
abData[dataCount] = (float)rowNum;
abData[dataCount+1] = heightmap[rowNum][columnNum];
@ -143,10 +159,10 @@ float** Terrain::getHeightmap(){
return this->heightmap;
}
unsigned int Terrain::getHeightmapHeight(){
int Terrain::getHeightmapHeight(){
return this->heightmapHeight;
}
unsigned int Terrain::getHeightmapWidth(){
int Terrain::getHeightmapWidth(){
return this->heightmapWidth;
}

11
game/terrain.hh
View File

@ -14,18 +14,17 @@ class Terrain {
void render();
Model getModel();
float** getHeightmap();
unsigned int getHeightmapHeight();
unsigned int getHeightmapWidth();
int getHeightmapHeight();
int getHeightmapWidth();
void makeTriangleMesh(int startX, int startZ, int endX, int endZ);
private:
Material material;
std::string heightmapFilePath;
unsigned int heightmapHeight, heightmapWidth;
int heightmapHeight, heightmapWidth;
float** heightmap; //can be accessed like 'float[][]'
bool heightmapChanged;
ACGL::OpenGL::SharedVertexArrayObject triangleMesh;
void makeTriangleMesh();
void set_abData(float* abData, unsigned int dataCount, unsigned int rowNum, unsigned int columnNum);
void set_abData(float* abData, int dataCount, int rowNum, int columnNum);
};
#endif