//颜色转换
public static System.Drawing.Color SystemColor(Color a)
{
a.r = NewMath.Round(a.r, 0, 1);
a.g = NewMath.Round(a.g, 0, 1);
a.b = NewMath.Round(a.b, 0, 1);
float _r = a.r * 255f;
float _g = a.g * 255f;
float _b = a.b * 255f;
return(System.Drawing.Color.FromArgb((int)_r, (int)_g, (int)_b));
}
//光照相关
public void SetLightingColor(Vectex v1)
{
//将顶点转换到世界空间中
Vectex v = Vectex.Colone(v1);
//求世界空间中的法向量
Vector3 n = v.nomal * device.ts.world.Inverse().Transpose();
//光线向量
Vector3 l = device.light.lightPosition - v.pos;
//公式 c=cr(ca+cl*n*l)
float t = NewMath.Round(Vector3.Dot(n, l), 0, 1);
Color c = device.light.diffuse * (device.light.ambient + device.light.sourse * t);
c = NewMath.Round(c, 0, 1);
v1.lightcolor = c;
}
public Color(System.Drawing.Color a)
{
this.r = NewMath.Round((float)a.R / 255f, 0, 1);
this.g = NewMath.Round((float)a.G / 255f, 0, 1);
this.b = NewMath.Round((float)a.B / 255f, 0, 1);
}
//扫描填色
public void DrawScanline(Vectex v1, Vectex v2, int yIndex)
{
float x1 = v1.pos.x;
float x2 = v2.pos.x;
float dx = v2.pos.x - v1.pos.x;
float x = x1;
//扫描密度，可以减小
float stepx = 0.5f;
int xIndex = (int)(x + 0.5f);
for (; x <= x2 && xIndex <= x2; x += stepx)
{
//插值当前点
Vectex p;
float t = (x - x1) / dx;
p = NewMath.Interp(v1, v2, t);
//画点坐标
xIndex = (int)(x + 0.5f);
if (xIndex >= device.width || xIndex <= 0 || yIndex <= 0 || yIndex >= device.height)
{
return;
}
if (p.rhw >= device.zBuffer[xIndex, yIndex])
{
device.zBuffer[xIndex, yIndex] = p.rhw;
float w = 1 / p.rhw;
if (device.lightMode == LightMode.ON)
{
Color lighlingColor = new Color(1, 1, 1);
lighlingColor = w * p.lightcolor;
if (device.renderState == RenderState.COLOR)
{
Color vertColor = new Color(1, 1, 1);
vertColor = w * p.color;
Color newColor = NewMath.Round(0.7f * vertColor + 0.3f * lighlingColor, 0, 1);
device.frameBuffer.SetPixel(xIndex, yIndex, Color.SystemColor(newColor));
}
if (device.renderState == RenderState.TEXTURE)
{
int uIndex;
int vIndex;
//目前只有点插值
int u = (int)(p.uvs.u * w * device.texWidth + 0.5f);
int v = (int)(p.uvs.v * w * device.texHeight + 0.5f);
uIndex = (int)NewMath.Round(u, 0, device.texWidth - 1);
vIndex = (int)NewMath.Round(v, 0, device.texHeight - 1);
//获取颜色
Color texColor = new Color(1, 1, 1);
texColor = new Color(device.textureBuffer.GetPixel(uIndex, vIndex));
Color newColor = NewMath.Round(0.7f * texColor + 0.3f * lighlingColor, 0, 1);
//画像素点
device.frameBuffer.SetPixel(xIndex, yIndex, Color.SystemColor(newColor));
}
}
else
{
if (device.renderState == RenderState.COLOR)
{
//用顶点颜色插值
Color vertColor = new Color(1, 1, 1);
vertColor = w * p.color;
device.frameBuffer.SetPixel(xIndex, yIndex, Color.SystemColor(vertColor));
}
if (device.renderState == RenderState.TEXTURE)
{
int uIndex;
int vIndex;
//目前只有点插值
int u = (int)(p.uvs.u * w * device.texWidth + 0.5f);
int v = (int)(p.uvs.v * w * device.texHeight + 0.5f);
uIndex = (int)NewMath.Round(u, 0, device.texWidth - 1);
vIndex = (int)NewMath.Round(v, 0, device.texHeight - 1);
//获取颜色
Color texColor = new Color(1, 1, 1);
texColor = new Color(device.textureBuffer.GetPixel(uIndex, vIndex));
//画像素点
device.frameBuffer.SetPixel(xIndex, yIndex, Color.SystemColor(texColor));
}
}
}
}
}