bool Terrain::loadHeightmap(const string& rawFile, int width)
{
const float HEIGHT_SCALE = 10.0f;
std::ifstream fileIn(rawFile.c_str(), std::ios::binary);
if (!fileIn.good())
{
std::cout << "File does not exist" << std::endl;
return false;
}
string stringBuffer(std::istreambuf_iterator<char>(fileIn), (std::istreambuf_iterator<char>()));
fileIn.close();
if (stringBuffer.size() != (width * width))
{
std::cout << "Image size does not match passed width" << std::endl;
return false;
}
vector<float> heights;
heights.reserve(width * width);
for (int i = 0; i < (width * width); ++i)
{
float value = (float)(unsigned char)stringBuffer[i] / 256.0f;
heights.push_back(value * HEIGHT_SCALE);
m_colors.push_back(Color(value, value, value));
}
glGenBuffers(1, &m_colorBuffer);
glBindBuffer(GL_ARRAY_BUFFER, m_colorBuffer);
glBufferData(GL_ARRAY_BUFFER, sizeof(GLfloat) * m_colors.size() * 3, &m_colors[0], GL_STATIC_DRAW);
generateVertices(heights, width);
generateIndices(width);
generateTexCoords(width);
generateNormals();
generateWaterVertices(width);
generateWaterIndices(width);
generateWaterTexCoords(width);
m_width = width;
return true;
}
/**
* Build a parametric surface.
*/
NewParametricShaderNode::NewParametricShaderNode()
: ParametricMeshShaderNode(50, 50)
{
_scale = 1.0f;
// Compute vertices and normal vectors
// computeVertexAndNormals(-M_PI/2, M_PI/2, -M_PI/2, M_PI/2);
// computeVertexAndNormals(0, M_PI, 0, M_PI * 2);
// computeVertexAndNormals(0, 2 * M_PI, 0, 1);
computeVertexAndNormals(0, 2 * M_PI, 0, 2 * M_PI);
for (int i = 0; i < _numVertices; i++) {
log("[%d] Pos=(%.2f %.2f %.2f) N=(%.2f %.2f %.2f) uv=(%.2f %.2f)\n", i,
_vertices[i].position[0], _vertices[i].position[1], _vertices[i].position[2],
_vertices[i].normal[0], _vertices[i].normal[1], _vertices[i].normal[2],
_vertices[i].texCoord[0], _vertices[i].texCoord[1]);
}
// Compute the number of indices
_numIndices = (_sampleU - 1) * (_sampleV - 1) * 2 * 3;
// Generate and fill in the index array.
generateIndices();
}
