public Color Fragment(Vector3 bar)
{
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();
Vector3 ref_l = Vector3.Normalize((Vector3.Multiply(n, Vector3.Dot(n, l) * 2) - l)); // reflected light
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 = (int)Math.Min(2 + color.R * (diff + .49 * spec), 255); //5, 0.6
int g = (int)Math.Min(2 + color.G * (diff + .49 * spec), 255);
int b = (int)Math.Min(2 + color.B * (diff + .49 * spec), 255);
color = Color.FromArgb(r, g, b);
return(color);
}
public Color Fragment(Vector3 bar)
{
Vector2 uv = VMatrix3x2.MultiplyMatrix3x2AndVec3(varying_uv, bar); // interpolate texture coordinates
var color = Model.Diffuse(uv);
var v1 = varying_tri.Get_Col(0);
var v2 = varying_tri.Get_Col(1);
var v3 = varying_tri.Get_Col(2);
Vector3 v31 = v3 - v1;
Vector3 v21 = v2 - v1;
Vector3 n = Vector3.Cross(v31, v21);
n = n.Normalize();
float intensity = Vector3.Dot(n, light_dir);
//color = Color.White; // for no texture rendering
int r = ToByteRange(color.R * intensity);
int g = ToByteRange(color.G * intensity);
int b = ToByteRange(color.B * intensity);
color = Color.FromArgb(r, g, b);
return(color);
}
public GouraudShader(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();
}
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);
}
//public Color Fragment(Vec3F bar, out bool discard)
//{
// discard = false;
// Vec2f uv = varying_uv * bar.VecToMat(); // interpolate texture coordinates
// var color = Model.Diffuse(uv);
// float intensity = varying_intensity * bar; // interpolate intensity for the current pixel
// int r = (int)Math.Min(255, color.R * intensity);
// int g = (int)Math.Min(255, color.G * intensity);
// int b = (int)Math.Min(255, color.B * intensity);
// color = Color.FromArgb(r, g, b);
// return color;
//}
public Color Fragment(Vector3 bar)
{
Vector2 uv = VMatrix3x2.MultiplyMatrix3x2AndVec3(varying_uv, bar); // interpolate texture coordinates
var color = Model.Diffuse(uv);
float intensity = Vector3.Dot(varying_intensity, bar); // interpolate intensity for the current pixel
if (intensity > .85)
{
intensity = 1;
}
else if (intensity > .60)
{
intensity = 0.80f;
}
else if (intensity > .45)
{
intensity = 0.60f;
}
else if (intensity > .30)
{
intensity = 0.45f;
}
else if (intensity > .15)
{
intensity = 0.30f;
}
else
{
intensity = 0;
}
int r = (int)Math.Min(255, color.R * intensity);
int g = (int)Math.Min(0, color.G * intensity);
int b = (int)Math.Min(200, color.B * intensity);
color = Color.FromArgb(r, g, b);
return(color);
}
