public Sampler(IOpenGL33 gl)
{
_gl = gl;
var handle = _gl.GenSampler();
if(handle == 0)
throw new NoHandleCreatedException();
Handle = handle;
}
private Terrain(IOpenGL33 gl, IVertexArray vertexArray, IVertexBuffer vertexBuffer, IElementArray elementBuffer, TerrainShader shader)
{
_gl = gl;
_vertexArray = vertexArray;
_vertexBuffer = vertexBuffer;
_elementBuffer = elementBuffer;
_shader = shader;
Model = Matrix4f.Identity;
View = Matrix4f.Identity;
Projection = Matrix4f.Identity;
Diffuse = new Vector4f(Color.DodgerBlue.R / 255f, Color.DodgerBlue.G / 255f, Color.DodgerBlue.B / 255f, 1f);
}
public TerrainShader(IOpenGL33 gl)
{
vertexShader = new VertexShader(gl, GetEmbeddedResourceAsString("VertexShader.vs"));
fragmentShader = new FragmentShader(gl, GetEmbeddedResourceAsString("FragmentShader.fs"));
var p = new ModGL.ObjectModel.Shaders.Program(gl, vertexShader, fragmentShader);
p.BindVertexAttributeLocations(PositionNormalTexCoord.Descriptor);
// Bind output fragment to the specified nme
gl.BindFragDataLocation(p.Handle, 0, "Color");
// Compile program and shaders
p.Compile();
program = p;
// Get the uniforms used by the shader program.
diffuseUniform = p.GetUniform<Vector4fUniform, Vector4f>("DiffuseColor");
modelViewProjection = p.GetUniform<MatrixUniform, Matrix4f>("ModelViewProjection");
viewProjection = p.GetUniform<MatrixUniform, Matrix4f>("ViewProjection");
textureUnitUniform = p.GetUniform<IntUniform, int>("Texture");
}
public static Terrain Build(IOpenGL33 gl, int columns, int rows, float width, float depth)
{
var noise = new PerlinNoise();
var noise2 = new PerlinNoise();
var vertexBuffer = new VertexBuffer<PositionNormalTexCoord>((columns + 1) * (rows + 1), gl);
var indexBuffer = new ElementBuffer<uint>(columns * rows * 6 , gl);
float fx = - width / 2;
float fy = -depth / 2;
float dx = width / columns;
float dy = depth / rows;
int i = 0;
for (int y = 0; y < (rows + 1); y++)
{
for (int x = 0; x < (columns + 1); x++, i++)
{
float ix = fx + x * dx;
float iy = fy + y * dy;
const float detail = 0.25f;
const float detailScale = 0.2f;
const float macro = 0.008f;
const float macroScale = 4f;
var fUp = (float)((noise.Noise(x * detail, 0, (y + 1) * detail) - noise2.Noise(x * detail, 0, (y + 1) * detail) * 0.25f) * detailScale + noise.Noise(x * macro, 0, (y + 1) * macro) * macroScale) ;
var fDown = (float)((noise.Noise(x * detail, 0, (y - 1) * detail) - noise2.Noise(x * detail, 0, (y - 1) * detail) * 0.25f) * detailScale + noise.Noise(x * macro, 0, (y - 1) * macro) * macroScale) ;
var fLeft = (float)((noise.Noise((x - 1) * detail, 0, y * detail) - noise2.Noise((x - 1) * detail, 0, y * detail) * 0.25f) * detailScale + noise.Noise((x - 1) * macro, 0, y * macro) * macroScale);
var fRight = (float)((noise.Noise((x + 1) * detail, 0, y * detail) - noise2.Noise((x + 1) * detail, 0, y * detail) * 0.25f) * detailScale + noise.Noise((x + 1) * macro, 0, y * macro) * macroScale);
var fThis = (float)((noise.Noise(x * detail, 0, y * detail) - noise2.Noise(x * detail, 0, y * detail) * 0.25f) * detailScale + noise.Noise(x * macro, 0, y * macro) * macroScale);
var vUp = new Vector3f(ix, fUp, iy - dy);
var vDown = new Vector3f(ix, fDown, iy + dy);
var vLeft = new Vector3f(ix - 1, fLeft, iy);
var vRight = new Vector3f(ix + 1, fRight, iy);
var vThis = new Vector3f(ix, fThis, iy);
var upperLeft = CalculateNormal(vLeft, vUp, vThis);
var upperRight = CalculateNormal(vUp, vRight, vThis);
var lowerRight = CalculateNormal(vRight, vDown, vThis);
var lowerLeft = CalculateNormal(vDown, vLeft, vThis);
var normal = upperLeft + upperRight + lowerLeft + lowerRight;
normal = new Vector3f(normal.X * 0.25f, normal.Y * 0.25f, normal.Z * 0.25f);
vertexBuffer[i] = new PositionNormalTexCoord { Normal = normal.Normalize(), Position = vThis, TexCoord = new Vector2f(vThis.X, vThis.Z)};
}
}
int offset = 0;
foreach(var index in Enumerable.Range(0, columns * rows + columns).Where(index => (index % (columns + 1)) != columns))
{
indexBuffer[offset] = (uint)index;
indexBuffer[offset + 1] = (uint)(index + (columns + 1) + 1);
indexBuffer[offset + 2] = (uint)index + 1;
indexBuffer[offset + 3] = (uint)index;
indexBuffer[offset + 4] = (uint)(index + (columns + 1));
indexBuffer[offset + 5] = (uint)(index + (columns + 1) + 1);
offset += 6;
}
using(vertexBuffer.Bind())
vertexBuffer.BufferData(BufferUsage.StaticDraw);
using(indexBuffer.Bind())
indexBuffer.BufferData(BufferUsage.StaticDraw);
var vertexArray = new VertexArray(gl, new[] {vertexBuffer}, new[] {PositionNormalTexCoord.Descriptor});
var shader = new TerrainShader(gl);
return new Terrain(gl, vertexArray, vertexBuffer, indexBuffer, shader);
}
