void MainWindow::GenerateGrass(Mesh *mesh)
{
if (!mesh->LoadObj("models/grass.obj"))
return;
grass_pos[0] = new VertexBuffer(m_rc, GL_ARRAY_BUFFER);
grass_pos[1] = new VertexBuffer(m_rc, GL_ARRAY_BUFFER);
bottomPosLoc = grassShader->GetAttribLocation("Position");
topPosLoc = grassShader->GetAttribLocation("Offset");
vector<Vector3f> positions;
vector<float> offsets;
const float step = 2.0f;
Vector2i s = terrain->GetSize();
float hw = s.x * 0.5f;
float hh = s.y * 0.5f;
grassInstanceCount = 0;
for (float x = -hw; x < hw; x += step)
for (float z = -hh + step; z < hh; z += step)
{
float height = terrain->GetHeightAt(x, z);
if (height < 0.24 * heightScale)
{
Vector3f shift_pos(
randf(-0.5f, 0.5f),
randf(-0.5f, 0.5f),
randf(-0.5f, 0.5f));
Vector3f grassPos = Vector3f(x, height, z);
positions.push_back(grassPos + shift_pos);
offsets.push_back(randf(M_PIf));
grassInstanceCount++;
}
}
grass_pos[0]->SetData(positions.size() * sizeof(Vector3f), positions.data(), GL_STATIC_DRAW);
grass_pos[1]->SetData(offsets.size() * sizeof(float), offsets.data(), GL_STATIC_DRAW);
}
bool Maze::is_dir_free(int pos, int dir) {
if( dir_in_bounds(pos, dir) ) {
return is_free(shift_pos(pos, dir));
}
return false;
}