private bool CullPoint(Vector2 point)
{
_Area0 = APIMath.Cross(point - _Position0, _Position1 - _Position0) / _AreaFull;
_Area1 = APIMath.Cross(point - _Position1, _Position2 - _Position1) / _AreaFull;
_Area2 = APIMath.Cross(point - _Position2, _Position0 - _Position2) / _AreaFull;
return(_Area0 >= 0 && _Area1 >= 0 && _Area2 >= 0);
}
private bool CullBackface()
{
Vector2 edge1 = _Position1 - _Position0;
Vector2 edge2 = _Position2 - _Position1;
_AreaFull = APIMath.Cross(edge2, edge1);
return(_AreaFull > 0);
}
private void CalculateBounds()
{
APIMath.MaxMinFast(_Position0.x, _Position1.x, _Position2.x, ref _XMAXF, ref _XMINF);
APIMath.MaxMinFast(_Position0.y, _Position1.y, _Position2.y, ref _YMAXF, ref _YMINF);
_XMAX = (int)(APIContext.viewport.widht * _XMAXF);
_YMAX = (int)(APIContext.viewport.height * _YMAXF);
_XMIN = (int)(APIContext.viewport.widht * _XMINF);
_YMIN = (int)(APIContext.viewport.height * _YMINF);
}
private bool DepthTest(Vector3 point, int x, int y)
{
if (!APIContext.states.depthTest)
{
return(true);
}
APITextureBuffer depthBuffer = APIContext.frameBufferManager.frameBufferTarget.depthBuffer;
float depth = point.z;
if (APIMath.Tex2D(depthBuffer, point).r <= depth)
{
depthBuffer.SetPixel(x, y, Color.red * depth);
return(true);
}
return(false);
}
private bool CalculateMipmap()
{
if (!Mathf.IsPowerOfTwo(_Width) || !Mathf.IsPowerOfTwo(_Height))
{
return(false);
}
int dimension = Mathf.Min(_Width, _Height);
int size = APIMath.Log2(dimension);
_Mipmaps[0] = this;
_Dimension = dimension;
for (int i = 1; i < size; i++)
{
dimension >>= 1;
_Mipmaps[i] = new APITextureBuffer(_Mipmaps[i - 1], dimension, dimension);
}
return(true);
}
public override Color Fragment(VertData i)
{
float att = Vector3.Dot(i.normal, new Vector3(0, -1f, 0));
return(att * APIMath.Tex2D(mainTexture, i.uv));
}
