public DepthShader(Model Model, Matrix4x4 ViewPort, Matrix4x4 Projection, Matrix4x4 ModelView)
{
this.Model = Model;
this.ViewPort = ViewPort;
this.Projection = Projection;
this.ModelView = ModelView;
VPM = ViewPort * Projection * ModelView;
varying_tri = new VMatrix3x3();
}
public Color Fragment(Vector3 bar)
{
var m = VMatrix3x3.MultiplyMatrix3x3AndVec3f(varying_tri, bar);
int r = (int)Math.Min(255 * (m.Z / 2000), 255);
int g = (int)Math.Min(255 * (m.Z / 2000), 255);
int b = (int)Math.Min(255 * (m.Z / 2000), 255);
var color = Color.FromArgb(r, g, b);
return(color);
}
public NoToneShader(Model Model, Matrix4x4 ViewPort, Matrix4x4 Projection, Matrix4x4 ModelView, Vector3 light_dir)
{
this.Model = Model;
this.ViewPort = ViewPort;
this.Projection = Projection;
this.ModelView = ModelView;
this.light_dir = light_dir;
VPM = ViewPort * Projection * ModelView;
varying_uv = new VMatrix3x2();
varying_tri = new VMatrix3x3();
}
public ShadowShader(Model Model, Matrix4x4 ViewPort, Matrix4x4 Projection,
Matrix4x4 ModelView,
Vector3 light_dir, float[] shadow_buffer, int width)
{
this.Model = Model;
this.ViewPort = ViewPort;
this.Projection = Projection;
this.ModelView = ModelView;
this.light_dir = light_dir;
this.shadow_buffer = shadow_buffer;
this.width = width;
VPM = ViewPort * Projection * ModelView;
varying_uv = new VMatrix3x2();
varying_tri = new VMatrix3x3();
}
public Color Fragment(Vector3 bar)
{
Vector3 m = VMatrix3x3.MultiplyMatrix3x3AndVec3f(varying_tri, bar);
Vector3 sb = uniform_m_shadow.MultiplyByVector3_V3(m);
int idx = (int)(sb.X) + (int)(sb.Y) * width;
var closestDepth = shadow_buffer[idx];
var currentDepth = sb.Z;
var shadow = 0.3f + 0.7f * (closestDepth < currentDepth + 43.34f ? 1.2f : 0.45f); //1.2, 0.45
// interpolate texture coordinates
Vector2 uv = VMatrix3x2.MultiplyMatrix3x2AndVec3(varying_uv, bar);
var color = Model.Diffuse(uv);
var norm = Model.Normal(uv);
var n = uniform_mit.MultiplyByVector3_V3(norm);
n = n.Normalize();
var l = uniform_m.MultiplyByVector3_V3(light_dir);
l = l.Normalize();
// reflected light value
var ref_l = Vector3.Normalize((Vector3.Multiply(n, Vector3.Dot(n, l) * 2) - l));
float spec = (float)Math.Pow(Math.Max(ref_l.Z, 0.0f), Model.Specular(uv));
float diff = Math.Max(0, Vector3.Dot(n, l));
int r = ToByteRange(2 + color.R * shadow * (diff + .49 * spec));
int g = ToByteRange(2 + color.G * shadow * (diff + .49 * spec));
int b = ToByteRange(2 + color.B * shadow * (diff + .49 * spec));
color = Color.FromArgb(r, g, b);
return(color);
}
