#include "HeightMap.h"


HeightMap::HeightMap(const std::string& name)
{
    std::ifstream file(name.c_str(), ios::binary);

    if (!file) return;

    numVertices = RAW_WIDTH * RAW_HEIGHT;
    numIndices = (RAW_WIDTH-1) * (RAW_HEIGHT-1)*6;

    vertices = new Vector3[numVertices];
    textureCoords = new Vector2[numVertices];
    colours = new Vector4[numVertices]; //NEW
    indices = new GLuint[numIndices];

    //Load in all char data from file
    unsigned char* data = new unsigned char[numVertices];
    file.read((char*) data, numVertices*sizeof(unsigned char));
    file.close();

    //Create our vertices and texture data from file
    for (int x = 0; x < RAW_WIDTH; ++x){
        for (int z=0; z < RAW_HEIGHT; ++z){
            int offset = (x * RAW_WIDTH) + z;

            //Scaled by a pre determined factor (modifying the terrain loaded
            //from file)
            vertices[offset] = Vector3(x * HEIGHTMAP_X,
                data[offset] * HEIGHTMAP_Y, z * HEIGHTMAP_Z);

            /*if (vertices[offset].y < 100.0f)
                colours[offset] = Vector4(0.2f, 0.2f, 0.2f, 0.2f);
            else
                colours[offset] = Vector4(1.0f, 1.0f, 1.0f, 1.0f);*/

            colours[offset] = Vector4(vertices[offset].y / 200.0f,
                vertices[offset].y / 200.0f, vertices[offset].y / 200.0f,
                vertices[offset].y / 200.0f);

            textureCoords[offset] = Vector2(
                x * HEIGHTMAP_TEX_X, z * HEIGHTMAP_TEX_Z);
        }
    }

    delete data;

    numIndices = 0;

    for (int x = 0; x < RAW_WIDTH-1; ++x){
        for (int z = 0; z < RAW_HEIGHT-1; ++z){
            int a = (x * (RAW_WIDTH)) + z;
            int b = ((x+1) * RAW_WIDTH) + z;
            int c = ((x+1) * RAW_WIDTH) + (z+1);
            int d = (x * RAW_WIDTH) + (z+1);

            indices[numIndices++] = c;
            indices[numIndices++] = b;
            indices[numIndices++] = a;

            indices[numIndices++] = a;
            indices[numIndices++] = d;
            indices[numIndices++] = c;
        }
    }

    BufferData();
}


HeightMap::~HeightMap(void)
{
}