private void ParseTerrainBlock(BinaryReader reader)
{
reader.BaseStream.Position = 0x1A4A8;
long fileSize = reader.BaseStream.Length;
long position = reader.BaseStream.Position;
TerrainSegment last = null;
while (true)
{
char[] trkd = reader.ReadChars(4); //"TRKD"
if (trkd[0] == 'C') //Strange format un-used AL22.TRI
{
return;
}
int blockLength = reader.ReadInt32();
int blockNumber = reader.ReadInt32();
byte unk1 = reader.ReadByte();
byte fenceType = reader.ReadByte();
TerrainSegment terrainSegment = new TerrainSegment();
terrainSegment.Number = Segments.Count;
terrainSegment.TextureIds = reader.ReadBytes(10);
terrainSegment.Rows[0] = ReadTerrainRow(reader);
terrainSegment.Rows[1] = ReadTerrainRow(reader);
terrainSegment.Rows[2] = ReadTerrainRow(reader);
terrainSegment.Rows[3] = ReadTerrainRow(reader);
//fenceType stores the sides of the road the fence lives, and the textureId to use for it.
// If the top bit is set, fence on the left exists, if next bit is set, fence is on the right. Both can also be set.
//The other 6 bits seem to the texture number
if (fenceType != 0)
{
bool bit7 = (fenceType & (0x1 << 7)) != 0;
bool bit6 = (fenceType & (0x1 << 6)) != 0;
terrainSegment.HasLeftFence = bit7;
terrainSegment.HasRightFence = bit6;
// Ignore the top 2 bits to find the texture to use
terrainSegment.FenceTextureId = fenceType & (0xff >> 2);
//Debug.WriteLine("fence: " + fenceType + ", texture: " + terrainSegment.FenceTextureId + ", " + terrainSegment.HasLeftFence + ", " + terrainSegment.HasRightFence);
}
//Debug.WriteLine("TRKD: " + i + ", " + terrainSegment.Rows[0].RightPoints[5] + ", fence: " + terrainSegment.FenceTextureId + " , " + terrainSegment.HasLeftFence + ", " + terrainSegment.HasRightFence);
if (last != null)
{
last.Next = terrainSegment;
terrainSegment.Prev = last;
}
last = terrainSegment;
Segments.Add(terrainSegment);
//skip to end of block (+12 to include block header)
position += blockLength + 12;
reader.BaseStream.Position = position;
if (reader.BaseStream.Position >= fileSize)
{
break;
}
}
// If this is a circuit track, hook the last segment up to the first
if (!IsOpenRoad)
{
last.Next = Segments[0];
Segments[0].Prev = last;
}
}
private void RenderSegment(TerrainSegment segment)
{
int vertexIndex = segment.TerrainBufferIndex;
DrawTerrainStrip(ref vertexIndex, 0, segment.Textures[0]);
DrawTerrainStrip(ref vertexIndex, 1, segment.Textures[1]);
DrawTerrainStrip(ref vertexIndex, 2, segment.Textures[2]);
DrawTerrainStrip(ref vertexIndex, 3, segment.Textures[3]);
DrawTerrainStrip(ref vertexIndex, 4, segment.Textures[4]);
DrawTerrainStrip(ref vertexIndex, 5, segment.Textures[5]);
DrawTerrainStrip(ref vertexIndex, 6, segment.Textures[6]);
DrawTerrainStrip(ref vertexIndex, 7, segment.Textures[7]);
DrawTerrainStrip(ref vertexIndex, 8, segment.Textures[8]);
DrawTerrainStrip(ref vertexIndex, 9, segment.Textures[9]);
}
void GetPointIndicesForRightSide(TerrainSegment segment, int terrainPointIndex, out int index1, out int index2)
{
// only care if this is the last terrain strip
if (terrainPointIndex == TriFile.NbrTerrainPointsPerSide - 1)
{
var node = _tri.Nodes[segment.Number * TriFile.NbrRowsPerSegment];
if (node.NodeProperty == TrackNodeProperty.RIGHT_TUNNEL_A2_A9)
{
index1 = 2;
index2 = 10;
return;
}
}
index1 = terrainPointIndex;
index2 = terrainPointIndex - 1;
}
private void DrawFenceStrips(TerrainSegment segment)
{
int offset = segment.FenceBufferIndex;
if (segment.HasLeftFence)
{
Engine.Instance.Device.Textures[0] = segment.FenceTexture;
Engine.Instance.Device.DrawPrimitives(PrimitiveType.TriangleStrip, offset, 4);
offset += 6;
}
if (segment.HasRightFence)
{
Engine.Instance.Device.Textures[0] = segment.FenceTexture;
Engine.Instance.Device.DrawPrimitives(PrimitiveType.TriangleStrip, offset, 4);
}
}
void GetPointIndicesForLeftSide(TerrainSegment segment, int terrainPointIndex, out int index1, out int index2)
{
// only care if this is the last terrain strip
if (terrainPointIndex == TriFile.NbrTerrainPointsPerSide - 1)
{
var node = _tri.Nodes[segment.Number * TriFile.NbrRowsPerSegment];
if (node.NodeProperty == TrackNodeProperty.LEFT_TUNNEL_A9_A4)
{
index1 = 9;
index2 = 4;
return;
}
if (node.NodeProperty == TrackNodeProperty.LEFT_TUNNEL_A9_A5)
{
index1 = 9;
index2 = 5;
return;
}
}
index1 = TriFile.NbrTerrainPointsPerSide + terrainPointIndex - 1;
index2 = TriFile.NbrTerrainPointsPerSide + terrainPointIndex;
}