internal TerrainBlock(int x_start, int y_start, int x_count, int y_count, BoundingBox box, int subdivision, Terrain owner)
{
bounds = box;
if (subdivision < owner.Subdivisions)
{
x_count /= 2;
y_count /= 2;
Vector3 new_size = box.Size / 2;
new_size.y = box.Size.y;
float offset = box.Size.x / 4;
children = new List <TerrainBlock>();
children.Add(new TerrainBlock(x_start, y_start, x_count, y_count, new BoundingBox()
{
Size = new_size, Position = box.Position + new Vector3(-offset, 0, offset)
}, subdivision + 1, owner));
children.Add(new TerrainBlock(x_start + x_count, y_start, x_count, y_count, new BoundingBox()
{
Size = new_size, Position = box.Position + new Vector3(offset, 0, offset)
}, subdivision + 1, owner));
children.Add(new TerrainBlock(x_start + x_count, y_start + y_count, x_count, y_count, new BoundingBox()
{
Size = new_size, Position = box.Position + new Vector3(offset, 0, -offset)
}, subdivision + 1, owner));
children.Add(new TerrainBlock(x_start, y_start + y_count, x_count, y_count, new BoundingBox()
{
Size = new_size, Position = box.Position + new Vector3(-offset, 0, -offset)
}, subdivision + 1, owner));
}
else
{
ib = new IndexBuffer <int>();
ib.Allocate(6 * (x_count) * (y_count));
int index = 0;
for (int i = 0; i < y_count; i++)
{
for (int j = 0; j < x_count; j++)
{
int i1 = (y_start + i) * owner.heightmap.Width + x_start + j;
int i2 = (y_start + i) * owner.heightmap.Width + x_start + j + 1;
int i3 = (y_start + i + 1) * owner.heightmap.Width + x_start + j + 1;
int i4 = (y_start + i + 1) * owner.heightmap.Width + x_start + j;
ib[index++] = i1;
ib[index++] = i3;
ib[index++] = i2;
ib[index++] = i1;
ib[index++] = i4;
ib[index++] = i3;
}
}
ib.BufferData(VboUsage.GL_STATIC_DRAW);
ib.FreeClientData();
}
}
protected override void Build()
{
vb = new VertexBuffer <Vector3>(Vector3.Descriptor);
vb.Allocate(8);
ib = new IndexBuffer <ushort>();
ib.Allocate(4 * 6);
vb[0] = new Vector3(-0.5f, -0.5f, -0.5f);
vb[1] = new Vector3(0.5f, -0.5f, -0.5f);
vb[2] = new Vector3(0.5f, 0.5f, -0.5f);
vb[3] = new Vector3(-0.5f, 0.5f, -0.5f);
vb[4] = new Vector3(-0.5f, -0.5f, 0.5f);
vb[5] = new Vector3(0.5f, -0.5f, 0.5f);
vb[6] = new Vector3(0.5f, 0.5f, 0.5f);
vb[7] = new Vector3(-0.5f, 0.5f, 0.5f);
ib[0] = 0;
ib[1] = 1;
ib[2] = 2;
ib[3] = 3;
ib[4] = 4;
ib[5] = 0;
ib[6] = 3;
ib[7] = 7;
ib[8] = 5;
ib[9] = 4;
ib[10] = 7;
ib[11] = 6;
ib[12] = 1;
ib[13] = 5;
ib[14] = 6;
ib[15] = 2;
ib[16] = 6;
ib[17] = 7;
ib[18] = 3;
ib[19] = 2;
ib[20] = 0;
ib[21] = 4;
ib[22] = 5;
ib[23] = 1;
vb.BufferData(VboUsage.GL_STATIC_DRAW);
ib.BufferData(VboUsage.GL_STATIC_DRAW);
// Client data is no longer needed. Free it!
vb.FreeClientData();
ib.FreeClientData();
}
internal TerrainBlock(int x_start, int y_start, int x_count, int y_count, BoundingBox box, int subdivision, Terrain owner)
{
bounds = box;
if (subdivision < owner.Subdivisions)
{
x_count /= 2;
y_count /= 2;
Vector3 new_size = box.Size / 2;
new_size.y = box.Size.y;
float offset = box.Size.x / 4;
children = new List<TerrainBlock>();
children.Add(new TerrainBlock(x_start, y_start, x_count, y_count, new BoundingBox() { Size = new_size, Position = box.Position + new Vector3(-offset, 0, offset) }, subdivision + 1, owner));
children.Add(new TerrainBlock(x_start + x_count, y_start, x_count, y_count, new BoundingBox() { Size = new_size, Position = box.Position + new Vector3(offset, 0, offset) }, subdivision + 1, owner));
children.Add(new TerrainBlock(x_start + x_count, y_start + y_count, x_count, y_count, new BoundingBox() { Size = new_size, Position = box.Position + new Vector3(offset, 0, -offset) }, subdivision + 1, owner));
children.Add(new TerrainBlock(x_start, y_start + y_count, x_count, y_count, new BoundingBox() { Size = new_size, Position = box.Position + new Vector3(-offset, 0, -offset) }, subdivision + 1, owner));
}
else
{
ib = new IndexBuffer<int>();
ib.Allocate(6 * (x_count) * (y_count));
int index = 0;
for (int i = 0; i < y_count; i++)
{
for (int j = 0; j < x_count; j++)
{
int i1 = (y_start + i) * owner.heightmap.Width + x_start + j;
int i2 = (y_start + i) * owner.heightmap.Width + x_start + j + 1;
int i3 = (y_start + i + 1) * owner.heightmap.Width + x_start + j + 1;
int i4 = (y_start + i + 1) * owner.heightmap.Width + x_start + j;
ib[index++] = i1;
ib[index++] = i3;
ib[index++] = i2;
ib[index++] = i1;
ib[index++] = i4;
ib[index++] = i3;
}
}
ib.BufferData(VboUsage.GL_STATIC_DRAW);
ib.FreeClientData();
}
}
private void GenerateDome()
{
int vertices = Segments * Segments * 2 + 1;
int indices = Segments * 6 + (Segments - 1) * 2 * Segments * 6;
vb = new VertexBuffer <SkydomeVertex>(SkydomeVertex.Descriptor);
ib = new IndexBuffer <uint>();
vb.Allocate(vertices);
ib.Allocate(indices);
int index = 0;
float vang_inc = (float)(Math.PI / 2) / Segments;
float hang_inc = (float)(2 * Math.PI) / Segments;
float hang = hang_inc;
float vang = vang_inc;
for (int i = 0; i < Segments; i++, vang += vang_inc)
{
float v_c = (float)Math.Cos(vang);
float v_s = (float)Math.Sin(vang);
for (int j = 0; j < Segments * 2; j++, hang += hang_inc)
{
float h_c = (float)Math.Cos(hang);
float h_s = (float)Math.Sin(hang);
Vector3 pos = new Vector3(h_c * v_s, v_c, h_s * v_s);
vb[index++] = new SkydomeVertex()
{
Position = pos,
Normal = -pos.Normalize()
};
}
hang = 0;
}
vb[index] = new SkydomeVertex()
{
Normal = Vector3.Down,
Position = new Vector3(0, 1f, 0)
};
vb.BufferData(VboUsage.GL_STATIC_DRAW);
vb.FreeClientData();
index = 0;
for (int i = 0; i < Segments * 2; i++)
{
ib[index++] = (uint)vertices - 1;
ib[index++] = (uint)i;
ib[index++] = (uint)(i + 1) % (Segments * 2); // Wraparound
}
for (int i = 0; i < Segments - 1; i++)
{
for (int j = 0; j < Segments * 2; j++)
{
int offset_1 = i * Segments * 2;
int offset_2 = i * Segments * 2 + Segments * 2;
int j2 = (j + 1) % (Segments * 2);
ib[index++] = (uint)(offset_1 + j);
ib[index++] = (uint)(offset_2 + j);
ib[index++] = (uint)(offset_1 + j2);
ib[index++] = (uint)(offset_2 + j);
ib[index++] = (uint)(offset_2 + j2);
ib[index++] = (uint)(offset_1 + j2);
}
}
ib.BufferData(VboUsage.GL_STATIC_DRAW);
ib.FreeClientData();
}
protected override void Build()
{
vb = new VertexBuffer<Vector3>(Vector3.Descriptor);
vb.Allocate(8);
ib = new IndexBuffer<ushort>();
ib.Allocate(4 * 6);
vb[0] = new Vector3(-0.5f, -0.5f, -0.5f);
vb[1] = new Vector3(0.5f, -0.5f, -0.5f);
vb[2] = new Vector3(0.5f, 0.5f, -0.5f);
vb[3] = new Vector3(-0.5f, 0.5f, -0.5f);
vb[4] = new Vector3(-0.5f, -0.5f, 0.5f);
vb[5] = new Vector3(0.5f, -0.5f, 0.5f);
vb[6] = new Vector3(0.5f, 0.5f, 0.5f);
vb[7] = new Vector3(-0.5f, 0.5f, 0.5f);
ib[0] = 0;
ib[1] = 1;
ib[2] = 2;
ib[3] = 3;
ib[4] = 4;
ib[5] = 0;
ib[6] = 3;
ib[7] = 7;
ib[8] = 5;
ib[9] = 4;
ib[10] = 7;
ib[11] = 6;
ib[12] = 1;
ib[13] = 5;
ib[14] = 6;
ib[15] = 2;
ib[16] = 6;
ib[17] = 7;
ib[18] = 3;
ib[19] = 2;
ib[20] = 0;
ib[21] = 4;
ib[22] = 5;
ib[23] = 1;
vb.BufferData(VboUsage.GL_STATIC_DRAW);
ib.BufferData(VboUsage.GL_STATIC_DRAW);
// Client data is no longer needed. Free it!
vb.FreeClientData();
ib.FreeClientData();
}