/// <summary>
/// Adds a new set of primitives to the batch
/// </summary>
/// <param name="renderMode">type of primitive to render</param>
/// <param name="vertices">buffer containing the vertices to add</param>
/// <param name="numVertices">number of vertices to add</param>
/// <param name="color">color of the batched primitives</param>
public void AddPrimitive(Mathbox.RenderMode renderMode, Vector3[] vertices, int numVertices, Color color)
{
if (renderMode == Mathbox.RenderMode.Dot || numVertices == 1)
{
AddDotPrimitive(vertices, numVertices, color);
}
else if (renderMode == Mathbox.RenderMode.Vector || numVertices == 2)
{
AddVectorPrimitive(vertices, numVertices, color);
}
else if (numVertices >= 3)
{
AddPolygonPrimitive(vertices, numVertices, color);
}
}
void BuildPrimitive(UInt16 address, Color color, Mathbox.RenderMode renderMode)
{
// add points to buffer
for (int numVertices = 0; ;)
{
VertexInstruction vertex = Memory[++address];
Vertices[numVertices++] = Vector3.Transform(GetVertexFromTable(vertex), Parent.D3DTS_WORLD);
// is this the last point of the plygon?
if (vertex.IsLastVertex)
{
#if DEBUG
if (MaxVertices < numVertices)
{
MaxVertices = numVertices;
Debug.WriteLine($"Max Vertices = {MaxVertices}");
}
#endif
DisplayListManager.AddPrimitive(renderMode, Vertices, numVertices, color);
return;
}
}
}
public void AddPrimitive(Mathbox.RenderMode renderMode, Vector3[] vertices, int numVertices, Color color)
{
Primitives.AddPrimitive(renderMode, vertices, numVertices, color);
}
public void Rasterize()
{
// locate the tile table in memory
System.Diagnostics.Debug.Assert(Memory[TERRAIN_BASE_ADDRESS] == 0xE00);
TileTableBaseAddress = Memory[TERRAIN_BASE_ADDRESS]; // always 0x0E00
Parent.StartRender();
Parent.LoadLightVector();
Parent.LoadViewPosition();
Parent.LoadViewMatrix(0x15);
Rotation = Parent.ViewRotation;
Parent.SetWorldMatrix(ref Parent.Terrain.Rotation);
// determine rendering method (dot/vector/polygon)
switch (Memory[TERRAIN_RENDERING_MODE])
{
case 0x0000: renderMode = Mathbox.RenderMode.Polygon; break;
case 0x0100: renderMode = Mathbox.RenderMode.Vector; break;
default: renderMode = Mathbox.RenderMode.Dot; break;
}
// get address of terrain object buffer
ObjectList = Memory[TERRAIN_OBJECT_LIST_ADDRESS];
Int16 z_max = (Int16)Memory[TERRAIN_Z_MAX];
Int16 z_min = (Int16)Memory[TERRAIN_Z_MIN];
Int16 x = (Int16)Memory[TERRAIN_X];
Int16 z_frac = (Int16)Memory[TERRAIN_Z_FRAC];
Int16 x_offset = (Int16)Memory[TERRAIN_X_OFFSET];
Int16 z_offset = (Int16)Memory[TERRAIN_Z_OFFSET];
// locate left front tile corner (x1,y1,z1)
// +-------+
// / /|
// / / | x2 = x1 + Mathbox.Tile.SIZE_X
// y1-- +-------+ | y2 = y1 + Mathbox.Tile.SIZE_Y
// | | + --z2 z2 = z1 + Mathbox.Tile.SIZE_Z
// | | /
// | |/
// y2-- +-------+ --z1
// | |
// x1 x2
Vector3 corner = new Vector3(
Tile.WIDTH_X - x_offset * 128 - x,
-Parent.ViewPosition.Y,
z_max * 128 - z_frac);
// render each row in the terrain
int row = z_offset / 16 + z_max; // first absolute row to be rendered
Row.Count = z_max - z_min + 1; // number of rows to display
while (Row.Count-- > 0)
{
DrawTerrainRow(row-- & 31, corner);
corner.Z -= Tile.DEPTH_Z; // move to next row along the Z axis
}
Parent.EndRender();
}
